arch/sparc/mm/sun4c.c

   1 /* $Id: sun4c.c,v 1.212 2001/12/21 04:56:15 davem Exp $
   2  * sun4c.c: Doing in software what should be done in hardware.
   3  *
   4  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
   6  * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
   7  * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
   8  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9  */
  10
  11 #define NR_TASK_BUCKETS 512
  12
  13 #include <linux/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/init.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/highmem.h>
  18 #include <linux/fs.h>
  19 #include <linux/seq_file.h>
  20
  21 #include <asm/scatterlist.h>
  22 #include <asm/page.h>
  23 #include <asm/pgalloc.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/vaddrs.h>
  26 #include <asm/idprom.h>
  27 #include <asm/machines.h>
  28 #include <asm/memreg.h>
  29 #include <asm/processor.h>
  30 #include <asm/auxio.h>
  31 #include <asm/io.h>
  32 #include <asm/oplib.h>
  33 #include <asm/openprom.h>
  34 #include <asm/mmu_context.h>
  35 #include <asm/sun4paddr.h>
  36 #include <asm/highmem.h>
  37 #include <asm/btfixup.h>
  38 #include <asm/cacheflush.h>
  39 #include <asm/tlbflush.h>
  40
  41 /* Because of our dynamic kernel TLB miss strategy, and how
  42  * our DVMA mapping allocation works, you _MUST_:
  43  *
  44  * 1) Disable interrupts _and_ not touch any dynamic kernel
  45  *    memory while messing with kernel MMU state.  By
  46  *    dynamic memory I mean any object which is not in
  47  *    the kernel image itself or a thread_union (both of
  48  *    which are locked into the MMU).
  49  * 2) Disable interrupts while messing with user MMU state.
  50  */
  51
  52 extern int num_segmaps, num_contexts;
  53
  54 extern unsigned long page_kernel;
  55
  56 #ifdef CONFIG_SUN4
  57 #define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
  58 #else
  59 /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
  60  * So let's save some cycles and just use that everywhere except for that bootup
  61  * sanity check.
  62  */
  63 #define SUN4C_VAC_SIZE 65536
  64 #endif
  65
  66 #define SUN4C_KERNEL_BUCKETS 32
  67
  68 /* Flushing the cache. */
  69 struct sun4c_vac_props sun4c_vacinfo;
  70 unsigned long sun4c_kernel_faults;
  71
  72 /* Invalidate every sun4c cache line tag. */
  73 static void __init sun4c_flush_all(void)
  74 {
  75         unsigned long begin, end;
  76
  77         if (sun4c_vacinfo.on)
  78                 panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
  79
  80         /* Clear 'valid' bit in all cache line tags */
  81         begin = AC_CACHETAGS;
  82         end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
  83         while (begin < end) {
  84                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
  85                                      "r" (begin), "i" (ASI_CONTROL));
  86                 begin += sun4c_vacinfo.linesize;
  87         }
  88 }
  89
  90 static void sun4c_flush_context_hw(void)
  91 {
  92         unsigned long end = SUN4C_VAC_SIZE;
  93
  94         __asm__ __volatile__(
  95                 "1:     addcc   %0, -4096, %0\n\t"
  96                 "       bne     1b\n\t"
  97                 "        sta    %%g0, [%0] %2"
  98         : "=&r" (end)
  99         : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
 100         : "cc");
 101 }
 102
 103 /* Must be called minimally with IRQs disabled. */
 104 static void sun4c_flush_segment_hw(unsigned long addr)
 105 {
 106         if (sun4c_get_segmap(addr) != invalid_segment) {
 107                 unsigned long vac_size = SUN4C_VAC_SIZE;
 108
 109                 __asm__ __volatile__(
 110                         "1:     addcc   %0, -4096, %0\n\t"
 111                         "       bne     1b\n\t"
 112                         "        sta    %%g0, [%2 + %0] %3"
 113                         : "=&r" (vac_size)
 114                         : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
 115                         : "cc");
 116         }
 117 }
 118
 119 /* File local boot time fixups. */
 120 BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
 121 BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
 122 BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
 123
 124 #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
 125 #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
 126 #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
 127
 128 /* Must be called minimally with interrupts disabled. */
 129 static void sun4c_flush_page_hw(unsigned long addr)
 130 {
 131         addr &= PAGE_MASK;
 132         if ((int)sun4c_get_pte(addr) < 0)
 133                 __asm__ __volatile__("sta %%g0, [%0] %1"
 134                                      : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
 135 }
 136
 137 /* Don't inline the software version as it eats too many cache lines if expanded. */
 138 static void sun4c_flush_context_sw(void)
 139 {
 140         unsigned long nbytes = SUN4C_VAC_SIZE;
 141         unsigned long lsize = sun4c_vacinfo.linesize;
 142
 143         __asm__ __volatile__(
 144         "add    %2, %2, %%g1\n\t"
 145         "add    %2, %%g1, %%g2\n\t"
 146         "add    %2, %%g2, %%g3\n\t"
 147         "add    %2, %%g3, %%g4\n\t"
 148         "add    %2, %%g4, %%g5\n\t"
 149         "add    %2, %%g5, %%o4\n\t"
 150         "add    %2, %%o4, %%o5\n"
 151         "1:\n\t"
 152         "subcc  %0, %%o5, %0\n\t"
 153         "sta    %%g0, [%0] %3\n\t"
 154         "sta    %%g0, [%0 + %2] %3\n\t"
 155         "sta    %%g0, [%0 + %%g1] %3\n\t"
 156         "sta    %%g0, [%0 + %%g2] %3\n\t"
 157         "sta    %%g0, [%0 + %%g3] %3\n\t"
 158         "sta    %%g0, [%0 + %%g4] %3\n\t"
 159         "sta    %%g0, [%0 + %%g5] %3\n\t"
 160         "bg     1b\n\t"
 161         " sta   %%g0, [%1 + %%o4] %3\n"
 162         : "=&r" (nbytes)
 163         : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
 164         : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 165 }
 166
 167 /* Don't inline the software version as it eats too many cache lines if expanded. */
 168 static void sun4c_flush_segment_sw(unsigned long addr)
 169 {
 170         if (sun4c_get_segmap(addr) != invalid_segment) {
 171                 unsigned long nbytes = SUN4C_VAC_SIZE;
 172                 unsigned long lsize = sun4c_vacinfo.linesize;
 173
 174                 __asm__ __volatile__(
 175                 "add    %2, %2, %%g1\n\t"
 176                 "add    %2, %%g1, %%g2\n\t"
 177                 "add    %2, %%g2, %%g3\n\t"
 178                 "add    %2, %%g3, %%g4\n\t"
 179                 "add    %2, %%g4, %%g5\n\t"
 180                 "add    %2, %%g5, %%o4\n\t"
 181                 "add    %2, %%o4, %%o5\n"
 182                 "1:\n\t"
 183                 "subcc  %1, %%o5, %1\n\t"
 184                 "sta    %%g0, [%0] %6\n\t"
 185                 "sta    %%g0, [%0 + %2] %6\n\t"
 186                 "sta    %%g0, [%0 + %%g1] %6\n\t"
 187                 "sta    %%g0, [%0 + %%g2] %6\n\t"
 188                 "sta    %%g0, [%0 + %%g3] %6\n\t"
 189                 "sta    %%g0, [%0 + %%g4] %6\n\t"
 190                 "sta    %%g0, [%0 + %%g5] %6\n\t"
 191                 "sta    %%g0, [%0 + %%o4] %6\n\t"
 192                 "bg     1b\n\t"
 193                 " add   %0, %%o5, %0\n"
 194                 : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
 195                 : "0" (addr), "1" (nbytes), "2" (lsize),
 196                   "i" (ASI_FLUSHSEG)
 197                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 198         }
 199 }
 200
 201 /* Don't inline the software version as it eats too many cache lines if expanded. */
 202 static void sun4c_flush_page_sw(unsigned long addr)
 203 {
 204         addr &= PAGE_MASK;
 205         if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
 206             _SUN4C_PAGE_VALID) {
 207                 unsigned long left = PAGE_SIZE;
 208                 unsigned long lsize = sun4c_vacinfo.linesize;
 209
 210                 __asm__ __volatile__(
 211                 "add    %2, %2, %%g1\n\t"
 212                 "add    %2, %%g1, %%g2\n\t"
 213                 "add    %2, %%g2, %%g3\n\t"
 214                 "add    %2, %%g3, %%g4\n\t"
 215                 "add    %2, %%g4, %%g5\n\t"
 216                 "add    %2, %%g5, %%o4\n\t"
 217                 "add    %2, %%o4, %%o5\n"
 218                 "1:\n\t"
 219                 "subcc  %1, %%o5, %1\n\t"
 220                 "sta    %%g0, [%0] %6\n\t"
 221                 "sta    %%g0, [%0 + %2] %6\n\t"
 222                 "sta    %%g0, [%0 + %%g1] %6\n\t"
 223                 "sta    %%g0, [%0 + %%g2] %6\n\t"
 224                 "sta    %%g0, [%0 + %%g3] %6\n\t"
 225                 "sta    %%g0, [%0 + %%g4] %6\n\t"
 226                 "sta    %%g0, [%0 + %%g5] %6\n\t"
 227                 "sta    %%g0, [%0 + %%o4] %6\n\t"
 228                 "bg     1b\n\t"
 229                 " add   %0, %%o5, %0\n"
 230                 : "=&r" (addr), "=&r" (left), "=&r" (lsize)
 231                 : "0" (addr), "1" (left), "2" (lsize),
 232                   "i" (ASI_FLUSHPG)
 233                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 234         }
 235 }
 236
 237 /* The sun4c's do have an on chip store buffer.  And the way you
 238  * clear them out isn't so obvious.  The only way I can think of
 239  * to accomplish this is to read the current context register,
 240  * store the same value there, then read an external hardware
 241  * register.
 242  */
 243 void sun4c_complete_all_stores(void)
 244 {
 245         volatile int _unused;
 246
 247         _unused = sun4c_get_context();
 248         sun4c_set_context(_unused);
 249 #ifdef CONFIG_SUN_AUXIO
 250         _unused = get_auxio();
 251 #endif
 252 }
 253
 254 /* Bootup utility functions. */
 255 static inline void sun4c_init_clean_segmap(unsigned char pseg)
 256 {
 257         unsigned long vaddr;
 258
 259         sun4c_put_segmap(0, pseg);
 260         for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
 261                 sun4c_put_pte(vaddr, 0);
 262         sun4c_put_segmap(0, invalid_segment);
 263 }
 264
 265 static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
 266 {
 267         unsigned long vaddr;
 268         unsigned char savectx, ctx;
 269
 270         savectx = sun4c_get_context();
 271         kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
 272         for (ctx = 0; ctx < num_contexts; ctx++) {
 273                 sun4c_set_context(ctx);
 274                 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
 275                         sun4c_put_segmap(vaddr, invalid_segment);
 276                 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
 277                         sun4c_put_segmap(vaddr, invalid_segment);
 278                 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
 279                         sun4c_put_segmap(vaddr, invalid_segment);
 280                 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
 281                         sun4c_put_segmap(vaddr, invalid_segment);
 282         }
 283         sun4c_set_context(savectx);
 284 }
 285
 286 void __init sun4c_probe_vac(void)
 287 {
 288         sun4c_disable_vac();
 289
 290         if (ARCH_SUN4) {
 291                 switch (idprom->id_machtype) {
 292
 293                 case (SM_SUN4|SM_4_110):
 294                         sun4c_vacinfo.type = VAC_NONE;
 295                         sun4c_vacinfo.num_bytes = 0;
 296                         sun4c_vacinfo.linesize = 0;
 297                         sun4c_vacinfo.do_hwflushes = 0;
 298                         prom_printf("No VAC. Get some bucks and buy a real computer.");
 299                         prom_halt();
 300                         break;
 301
 302                 case (SM_SUN4|SM_4_260):
 303                         sun4c_vacinfo.type = VAC_WRITE_BACK;
 304                         sun4c_vacinfo.num_bytes = 128 * 1024;
 305                         sun4c_vacinfo.linesize = 16;
 306                         sun4c_vacinfo.do_hwflushes = 0;
 307                         break;
 308
 309                 case (SM_SUN4|SM_4_330):
 310                         sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 311                         sun4c_vacinfo.num_bytes = 128 * 1024;
 312                         sun4c_vacinfo.linesize = 16;
 313                         sun4c_vacinfo.do_hwflushes = 0;
 314                         break;
 315
 316                 case (SM_SUN4|SM_4_470):
 317                         sun4c_vacinfo.type = VAC_WRITE_BACK;
 318                         sun4c_vacinfo.num_bytes = 128 * 1024;
 319                         sun4c_vacinfo.linesize = 32;
 320                         sun4c_vacinfo.do_hwflushes = 0;
 321                         break;
 322
 323                 default:
 324                         prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
 325                         prom_halt();
 326                 };
 327         } else {
 328                 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 329
 330                 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 331                     (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 332                         /* PROM on SS1 lacks this info, to be super safe we
 333                          * hard code it here since this arch is cast in stone.
 334                          */
 335                         sun4c_vacinfo.num_bytes = 65536;
 336                         sun4c_vacinfo.linesize = 16;
 337                 } else {
 338                         sun4c_vacinfo.num_bytes =
 339                          prom_getintdefault(prom_root_node, "vac-size", 65536);
 340                         sun4c_vacinfo.linesize =
 341                          prom_getintdefault(prom_root_node, "vac-linesize", 16);
 342                 }
 343                 sun4c_vacinfo.do_hwflushes =
 344                  prom_getintdefault(prom_root_node, "vac-hwflush", 0);
 345
 346                 if (sun4c_vacinfo.do_hwflushes == 0)
 347                         sun4c_vacinfo.do_hwflushes =
 348                          prom_getintdefault(prom_root_node, "vac_hwflush", 0);
 349
 350                 if (sun4c_vacinfo.num_bytes != 65536) {
 351                         prom_printf("WEIRD Sun4C VAC cache size, "
 352                                     "tell sparclinux@vger.kernel.org");
 353                         prom_halt();
 354                 }
 355         }
 356
 357         sun4c_vacinfo.num_lines =
 358                 (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
 359         switch (sun4c_vacinfo.linesize) {
 360         case 16:
 361                 sun4c_vacinfo.log2lsize = 4;
 362                 break;
 363         case 32:
 364                 sun4c_vacinfo.log2lsize = 5;
 365                 break;
 366         default:
 367                 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
 368                             sun4c_vacinfo.linesize);
 369                 prom_halt();
 370         };
 371
 372         sun4c_flush_all();
 373         sun4c_enable_vac();
 374 }
 375
 376 /* Patch instructions for the low level kernel fault handler. */
 377 extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
 378 extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
 379 extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
 380 extern unsigned long num_context_patch1, num_context_patch1_16;
 381 extern unsigned long num_context_patch2_16;
 382 extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
 383 extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
 384 extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
 385
 386 #define PATCH_INSN(src, dst) do {       \
 387                 daddr = &(dst);         \
 388                 iaddr = &(src);         \
 389                 *daddr = *iaddr;        \
 390         } while (0)
 391
 392 static void __init patch_kernel_fault_handler(void)
 393 {
 394         unsigned long *iaddr, *daddr;
 395
 396         switch (num_segmaps) {
 397                 case 128:
 398                         /* Default, nothing to do. */
 399                         break;
 400                 case 256:
 401                         PATCH_INSN(invalid_segment_patch1_ff,
 402                                    invalid_segment_patch1);
 403                         PATCH_INSN(invalid_segment_patch2_ff,
 404                                    invalid_segment_patch2);
 405                         break;
 406                 case 512:
 407                         PATCH_INSN(invalid_segment_patch1_1ff,
 408                                    invalid_segment_patch1);
 409                         PATCH_INSN(invalid_segment_patch2_1ff,
 410                                    invalid_segment_patch2);
 411                         break;
 412                 default:
 413                         prom_printf("Unhandled number of segmaps: %d\n",
 414                                     num_segmaps);
 415                         prom_halt();
 416         };
 417         switch (num_contexts) {
 418                 case 8:
 419                         /* Default, nothing to do. */
 420                         break;
 421                 case 16:
 422                         PATCH_INSN(num_context_patch1_16,
 423                                    num_context_patch1);
 424                         break;
 425                 default:
 426                         prom_printf("Unhandled number of contexts: %d\n",
 427                                     num_contexts);
 428                         prom_halt();
 429         };
 430
 431         if (sun4c_vacinfo.do_hwflushes != 0) {
 432                 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
 433                 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
 434         } else {
 435                 switch (sun4c_vacinfo.linesize) {
 436                 case 16:
 437                         /* Default, nothing to do. */
 438                         break;
 439                 case 32:
 440                         PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
 441                         break;
 442                 default:
 443                         prom_printf("Impossible VAC linesize %d, halting...\n",
 444                                     sun4c_vacinfo.linesize);
 445                         prom_halt();
 446                 };
 447         }
 448 }
 449
 450 static void __init sun4c_probe_mmu(void)
 451 {
 452         if (ARCH_SUN4) {
 453                 switch (idprom->id_machtype) {
 454                 case (SM_SUN4|SM_4_110):
 455                         prom_printf("No support for 4100 yet\n");
 456                         prom_halt();
 457                         num_segmaps = 256;
 458                         num_contexts = 8;
 459                         break;
 460
 461                 case (SM_SUN4|SM_4_260):
 462                         /* should be 512 segmaps. when it get fixed */
 463                         num_segmaps = 256;
 464                         num_contexts = 16;
 465                         break;
 466
 467                 case (SM_SUN4|SM_4_330):
 468                         num_segmaps = 256;
 469                         num_contexts = 16;
 470                         break;
 471
 472                 case (SM_SUN4|SM_4_470):
 473                         /* should be 1024 segmaps. when it get fixed */
 474                         num_segmaps = 256;
 475                         num_contexts = 64;
 476                         break;
 477                 default:
 478                         prom_printf("Invalid SUN4 model\n");
 479                         prom_halt();
 480                 };
 481         } else {
 482                 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 483                     (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 484                         /* Hardcode these just to be safe, PROM on SS1 does
 485                         * not have this info available in the root node.
 486                         */
 487                         num_segmaps = 128;
 488                         num_contexts = 8;
 489                 } else {
 490                         num_segmaps =
 491                             prom_getintdefault(prom_root_node, "mmu-npmg", 128);
 492                         num_contexts =
 493                             prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
 494                 }
 495         }
 496         patch_kernel_fault_handler();
 497 }
 498
 499 volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
 500
 501 void __init sun4c_probe_memerr_reg(void)
 502 {
 503         int node;
 504         struct linux_prom_registers regs[1];
 505
 506         if (ARCH_SUN4) {
 507                 sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
 508         } else {
 509                 node = prom_getchild(prom_root_node);
 510                 node = prom_searchsiblings(prom_root_node, "memory-error");
 511                 if (!node)
 512                         return;
 513                 if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
 514                         return;
 515                 /* hmm I think regs[0].which_io is zero here anyways */
 516                 sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
 517         }
 518 }
 519
 520 static inline void sun4c_init_ss2_cache_bug(void)
 521 {
 522         extern unsigned long start;
 523
 524         if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
 525             (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
 526             (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
 527             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
 528                 /* Whee.. */
 529                 printk("SS2 cache bug detected, uncaching trap table page\n");
 530                 sun4c_flush_page((unsigned int) &start);
 531                 sun4c_put_pte(((unsigned long) &start),
 532                         (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
 533         }
 534 }
 535
 536 /* Addr is always aligned on a page boundary for us already. */
 537 static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
 538     unsigned long addr, int len)
 539 {
 540         unsigned long page, end;
 541
 542         *pba = addr;
 543
 544         end = PAGE_ALIGN((addr + len));
 545         while (addr < end) {
 546                 page = va;
 547                 sun4c_flush_page(page);
 548                 page -= PAGE_OFFSET;
 549                 page >>= PAGE_SHIFT;
 550                 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
 551                          _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
 552                 sun4c_put_pte(addr, page);
 553                 addr += PAGE_SIZE;
 554                 va += PAGE_SIZE;
 555         }
 556
 557         return 0;
 558 }
 559
 560 static struct page *sun4c_translate_dvma(unsigned long busa)
 561 {
 562         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 563         unsigned long pte = sun4c_get_pte(busa);
 564         return pfn_to_page(pte & SUN4C_PFN_MASK);
 565 }
 566
 567 static void sun4c_unmap_dma_area(unsigned long busa, int len)
 568 {
 569         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 570         /* XXX Implement this */
 571 }
 572
 573 /* TLB management. */
 574
 575 /* Don't change this struct without changing entry.S. This is used
 576  * in the in-window kernel fault handler, and you don't want to mess
 577  * with that. (See sun4c_fault in entry.S).
 578  */
 579 struct sun4c_mmu_entry {
 580         struct sun4c_mmu_entry *next;
 581         struct sun4c_mmu_entry *prev;
 582         unsigned long vaddr;
 583         unsigned char pseg;
 584         unsigned char locked;
 585
 586         /* For user mappings only, and completely hidden from kernel
 587          * TLB miss code.
 588          */
 589         unsigned char ctx;
 590         struct sun4c_mmu_entry *lru_next;
 591         struct sun4c_mmu_entry *lru_prev;
 592 };
 593
 594 static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
 595
 596 static void __init sun4c_init_mmu_entry_pool(void)
 597 {
 598         int i;
 599
 600         for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
 601                 mmu_entry_pool[i].pseg = i;
 602                 mmu_entry_pool[i].next = NULL;
 603                 mmu_entry_pool[i].prev = NULL;
 604                 mmu_entry_pool[i].vaddr = 0;
 605                 mmu_entry_pool[i].locked = 0;
 606                 mmu_entry_pool[i].ctx = 0;
 607                 mmu_entry_pool[i].lru_next = NULL;
 608                 mmu_entry_pool[i].lru_prev = NULL;
 609         }
 610         mmu_entry_pool[invalid_segment].locked = 1;
 611 }
 612
 613 static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
 614                                    unsigned long bits_off)
 615 {
 616         unsigned long start, end;
 617
 618         end = vaddr + SUN4C_REAL_PGDIR_SIZE;
 619         for (start = vaddr; start < end; start += PAGE_SIZE)
 620                 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
 621                         sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
 622                                       ~bits_off);
 623 }
 624
 625 static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
 626 {
 627         unsigned long vaddr;
 628         unsigned char pseg, ctx;
 629 #ifdef CONFIG_SUN4
 630         /* sun4/110 and 260 have no kadb. */
 631         if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) &&
 632             (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
 633 #endif
 634         for (vaddr = KADB_DEBUGGER_BEGVM;
 635              vaddr < LINUX_OPPROM_ENDVM;
 636              vaddr += SUN4C_REAL_PGDIR_SIZE) {
 637                 pseg = sun4c_get_segmap(vaddr);
 638                 if (pseg != invalid_segment) {
 639                         mmu_entry_pool[pseg].locked = 1;
 640                         for (ctx = 0; ctx < num_contexts; ctx++)
 641                                 prom_putsegment(ctx, vaddr, pseg);
 642                         fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
 643                 }
 644         }
 645 #ifdef CONFIG_SUN4
 646         }
 647 #endif
 648         for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
 649                 pseg = sun4c_get_segmap(vaddr);
 650                 mmu_entry_pool[pseg].locked = 1;
 651                 for (ctx = 0; ctx < num_contexts; ctx++)
 652                         prom_putsegment(ctx, vaddr, pseg);
 653                 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
 654         }
 655 }
 656
 657 static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
 658 {
 659         int i, ctx;
 660
 661         while (start < end) {
 662                 for (i = 0; i < invalid_segment; i++)
 663                         if (!mmu_entry_pool[i].locked)
 664                                 break;
 665                 mmu_entry_pool[i].locked = 1;
 666                 sun4c_init_clean_segmap(i);
 667                 for (ctx = 0; ctx < num_contexts; ctx++)
 668                         prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
 669                 start += SUN4C_REAL_PGDIR_SIZE;
 670         }
 671 }
 672
 673 /* Don't change this struct without changing entry.S. This is used
 674  * in the in-window kernel fault handler, and you don't want to mess
 675  * with that. (See sun4c_fault in entry.S).
 676  */
 677 struct sun4c_mmu_ring {
 678         struct sun4c_mmu_entry ringhd;
 679         int num_entries;
 680 };
 681
 682 static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
 683 static struct sun4c_mmu_ring sun4c_ufree_ring;       /* free user entries */
 684 static struct sun4c_mmu_ring sun4c_ulru_ring;        /* LRU user entries */
 685 struct sun4c_mmu_ring sun4c_kernel_ring;      /* used kernel entries */
 686 struct sun4c_mmu_ring sun4c_kfree_ring;       /* free kernel entries */
 687
 688 static inline void sun4c_init_rings(void)
 689 {
 690         int i;
 691
 692         for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
 693                 sun4c_context_ring[i].ringhd.next =
 694                         sun4c_context_ring[i].ringhd.prev =
 695                         &sun4c_context_ring[i].ringhd;
 696                 sun4c_context_ring[i].num_entries = 0;
 697         }
 698         sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
 699                 &sun4c_ufree_ring.ringhd;
 700         sun4c_ufree_ring.num_entries = 0;
 701         sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
 702                 &sun4c_ulru_ring.ringhd;
 703         sun4c_ulru_ring.num_entries = 0;
 704         sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
 705                 &sun4c_kernel_ring.ringhd;
 706         sun4c_kernel_ring.num_entries = 0;
 707         sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
 708                 &sun4c_kfree_ring.ringhd;
 709         sun4c_kfree_ring.num_entries = 0;
 710 }
 711
 712 static void add_ring(struct sun4c_mmu_ring *ring,
 713                      struct sun4c_mmu_entry *entry)
 714 {
 715         struct sun4c_mmu_entry *head = &ring->ringhd;
 716
 717         entry->prev = head;
 718         (entry->next = head->next)->prev = entry;
 719         head->next = entry;
 720         ring->num_entries++;
 721 }
 722
 723 static __inline__ void add_lru(struct sun4c_mmu_entry *entry)
 724 {
 725         struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
 726         struct sun4c_mmu_entry *head = &ring->ringhd;
 727
 728         entry->lru_next = head;
 729         (entry->lru_prev = head->lru_prev)->lru_next = entry;
 730         head->lru_prev = entry;
 731 }
 732
 733 static void add_ring_ordered(struct sun4c_mmu_ring *ring,
 734                              struct sun4c_mmu_entry *entry)
 735 {
 736         struct sun4c_mmu_entry *head = &ring->ringhd;
 737         unsigned long addr = entry->vaddr;
 738
 739         while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
 740                 head = head->next;
 741
 742         entry->prev = head;
 743         (entry->next = head->next)->prev = entry;
 744         head->next = entry;
 745         ring->num_entries++;
 746
 747         add_lru(entry);
 748 }
 749
 750 static __inline__ void remove_ring(struct sun4c_mmu_ring *ring,
 751                                    struct sun4c_mmu_entry *entry)
 752 {
 753         struct sun4c_mmu_entry *next = entry->next;
 754
 755         (next->prev = entry->prev)->next = next;
 756         ring->num_entries--;
 757 }
 758
 759 static void remove_lru(struct sun4c_mmu_entry *entry)
 760 {
 761         struct sun4c_mmu_entry *next = entry->lru_next;
 762
 763         (next->lru_prev = entry->lru_prev)->lru_next = next;
 764 }
 765
 766 static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
 767 {
 768         remove_ring(sun4c_context_ring+ctx, entry);
 769         remove_lru(entry);
 770         add_ring(&sun4c_ufree_ring, entry);
 771 }
 772
 773 static void free_kernel_entry(struct sun4c_mmu_entry *entry,
 774                               struct sun4c_mmu_ring *ring)
 775 {
 776         remove_ring(ring, entry);
 777         add_ring(&sun4c_kfree_ring, entry);
 778 }
 779
 780 static void __init sun4c_init_fill_kernel_ring(int howmany)
 781 {
 782         int i;
 783
 784         while (howmany) {
 785                 for (i = 0; i < invalid_segment; i++)
 786                         if (!mmu_entry_pool[i].locked)
 787                                 break;
 788                 mmu_entry_pool[i].locked = 1;
 789                 sun4c_init_clean_segmap(i);
 790                 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
 791                 howmany--;
 792         }
 793 }
 794
 795 static void __init sun4c_init_fill_user_ring(void)
 796 {
 797         int i;
 798
 799         for (i = 0; i < invalid_segment; i++) {
 800                 if (mmu_entry_pool[i].locked)
 801                         continue;
 802                 sun4c_init_clean_segmap(i);
 803                 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
 804         }
 805 }
 806
 807 static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
 808 {
 809         int savectx, ctx;
 810
 811         savectx = sun4c_get_context();
 812         for (ctx = 0; ctx < num_contexts; ctx++) {
 813                 sun4c_set_context(ctx);
 814                 sun4c_put_segmap(kentry->vaddr, invalid_segment);
 815         }
 816         sun4c_set_context(savectx);
 817 }
 818
 819 static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
 820 {
 821         int savectx, ctx;
 822
 823         savectx = sun4c_get_context();
 824         for (ctx = 0; ctx < num_contexts; ctx++) {
 825                 sun4c_set_context(ctx);
 826                 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
 827         }
 828         sun4c_set_context(savectx);
 829 }
 830
 831 #define sun4c_user_unmap(__entry) \
 832         sun4c_put_segmap((__entry)->vaddr, invalid_segment)
 833
 834 static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
 835 {
 836         struct sun4c_mmu_entry *head = &crp->ringhd;
 837         unsigned long flags;
 838
 839         local_irq_save(flags);
 840         if (head->next != head) {
 841                 struct sun4c_mmu_entry *entry = head->next;
 842                 int savectx = sun4c_get_context();
 843
 844                 flush_user_windows();
 845                 sun4c_set_context(ctx);
 846                 sun4c_flush_context();
 847                 do {
 848                         struct sun4c_mmu_entry *next = entry->next;
 849
 850                         sun4c_user_unmap(entry);
 851                         free_user_entry(ctx, entry);
 852
 853                         entry = next;
 854                 } while (entry != head);
 855                 sun4c_set_context(savectx);
 856         }
 857         local_irq_restore(flags);
 858 }
 859
 860 static int sun4c_user_taken_entries;  /* This is how much we have.             */
 861 static int max_user_taken_entries;    /* This limits us and prevents deadlock. */
 862
 863 static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
 864 {
 865         struct sun4c_mmu_entry *this_entry;
 866
 867         /* If some are free, return first one. */
 868         if (sun4c_kfree_ring.num_entries) {
 869                 this_entry = sun4c_kfree_ring.ringhd.next;
 870                 return this_entry;
 871         }
 872
 873         /* Else free one up. */
 874         this_entry = sun4c_kernel_ring.ringhd.prev;
 875         sun4c_flush_segment(this_entry->vaddr);
 876         sun4c_kernel_unmap(this_entry);
 877         free_kernel_entry(this_entry, &sun4c_kernel_ring);
 878         this_entry = sun4c_kfree_ring.ringhd.next;
 879
 880         return this_entry;
 881 }
 882
 883 /* Using this method to free up mmu entries eliminates a lot of
 884  * potential races since we have a kernel that incurs tlb
 885  * replacement faults.  There may be performance penalties.
 886  *
 887  * NOTE: Must be called with interrupts disabled.
 888  */
 889 static struct sun4c_mmu_entry *sun4c_user_strategy(void)
 890 {
 891         struct sun4c_mmu_entry *entry;
 892         unsigned char ctx;
 893         int savectx;
 894
 895         /* If some are free, return first one. */
 896         if (sun4c_ufree_ring.num_entries) {
 897                 entry = sun4c_ufree_ring.ringhd.next;
 898                 goto unlink_out;
 899         }
 900
 901         if (sun4c_user_taken_entries) {
 902                 entry = sun4c_kernel_strategy();
 903                 sun4c_user_taken_entries--;
 904                 goto kunlink_out;
 905         }
 906
 907         /* Grab from the beginning of the LRU list. */
 908         entry = sun4c_ulru_ring.ringhd.lru_next;
 909         ctx = entry->ctx;
 910
 911         savectx = sun4c_get_context();
 912         flush_user_windows();
 913         sun4c_set_context(ctx);
 914         sun4c_flush_segment(entry->vaddr);
 915         sun4c_user_unmap(entry);
 916         remove_ring(sun4c_context_ring + ctx, entry);
 917         remove_lru(entry);
 918         sun4c_set_context(savectx);
 919
 920         return entry;
 921
 922 unlink_out:
 923         remove_ring(&sun4c_ufree_ring, entry);
 924         return entry;
 925 kunlink_out:
 926         remove_ring(&sun4c_kfree_ring, entry);
 927         return entry;
 928 }
 929
 930 /* NOTE: Must be called with interrupts disabled. */
 931 void sun4c_grow_kernel_ring(void)
 932 {
 933         struct sun4c_mmu_entry *entry;
 934
 935         /* Prevent deadlock condition. */
 936         if (sun4c_user_taken_entries >= max_user_taken_entries)
 937                 return;
 938
 939         if (sun4c_ufree_ring.num_entries) {
 940                 entry = sun4c_ufree_ring.ringhd.next;
 941                 remove_ring(&sun4c_ufree_ring, entry);
 942                 add_ring(&sun4c_kfree_ring, entry);
 943                 sun4c_user_taken_entries++;
 944         }
 945 }
 946
 947 /* 2 page buckets for task struct and kernel stack allocation.
 948  *
 949  * TASK_STACK_BEGIN
 950  * bucket[0]
 951  * bucket[1]
 952  *   [ ... ]
 953  * bucket[NR_TASK_BUCKETS-1]
 954  * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
 955  *
 956  * Each slot looks like:
 957  *
 958  *  page 1 --  task struct + beginning of kernel stack
 959  *  page 2 --  rest of kernel stack
 960  */
 961
 962 union task_union *sun4c_bucket[NR_TASK_BUCKETS];
 963
 964 static int sun4c_lowbucket_avail;
 965
 966 #define BUCKET_EMPTY     ((union task_union *) 0)
 967 #define BUCKET_SHIFT     (PAGE_SHIFT + 1)        /* log2(sizeof(struct task_bucket)) */
 968 #define BUCKET_SIZE      (1 << BUCKET_SHIFT)
 969 #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
 970 #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
 971 #define BUCKET_PTE(page)       \
 972         ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
 973 #define BUCKET_PTE_PAGE(pte)   \
 974         (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
 975
 976 static void get_locked_segment(unsigned long addr)
 977 {
 978         struct sun4c_mmu_entry *stolen;
 979         unsigned long flags;
 980
 981         local_irq_save(flags);
 982         addr &= SUN4C_REAL_PGDIR_MASK;
 983         stolen = sun4c_user_strategy();
 984         max_user_taken_entries--;
 985         stolen->vaddr = addr;
 986         flush_user_windows();
 987         sun4c_kernel_map(stolen);
 988         local_irq_restore(flags);
 989 }
 990
 991 static void free_locked_segment(unsigned long addr)
 992 {
 993         struct sun4c_mmu_entry *entry;
 994         unsigned long flags;
 995         unsigned char pseg;
 996
 997         local_irq_save(flags);
 998         addr &= SUN4C_REAL_PGDIR_MASK;
 999         pseg = sun4c_get_segmap(addr);
1000         entry = &mmu_entry_pool[pseg];
1001
1002         flush_user_windows();
1003         sun4c_flush_segment(addr);
1004         sun4c_kernel_unmap(entry);
1005         add_ring(&sun4c_ufree_ring, entry);
1006         max_user_taken_entries++;
1007         local_irq_restore(flags);
1008 }
1009
1010 static inline void garbage_collect(int entry)
1011 {
1012         int start, end;
1013
1014         /* 32 buckets per segment... */
1015         entry &= ~31;
1016         start = entry;
1017         for (end = (start + 32); start < end; start++)
1018                 if (sun4c_bucket[start] != BUCKET_EMPTY)
1019                         return;
1020
1021         /* Entire segment empty, release it. */
1022         free_locked_segment(BUCKET_ADDR(entry));
1023 }
1024
1025 static struct thread_info *sun4c_alloc_thread_info(void)
1026 {
1027         unsigned long addr, pages;
1028         int entry;
1029
1030         pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1031         if (!pages)
1032                 return NULL;
1033
1034         for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1035                 if (sun4c_bucket[entry] == BUCKET_EMPTY)
1036                         break;
1037         if (entry == NR_TASK_BUCKETS) {
1038                 free_pages(pages, THREAD_INFO_ORDER);
1039                 return NULL;
1040         }
1041         if (entry >= sun4c_lowbucket_avail)
1042                 sun4c_lowbucket_avail = entry + 1;
1043
1044         addr = BUCKET_ADDR(entry);
1045         sun4c_bucket[entry] = (union task_union *) addr;
1046         if(sun4c_get_segmap(addr) == invalid_segment)
1047                 get_locked_segment(addr);
1048
1049         /* We are changing the virtual color of the page(s)
1050          * so we must flush the cache to guarantee consistency.
1051          */
1052         sun4c_flush_page(pages);
1053 #ifndef CONFIG_SUN4
1054         sun4c_flush_page(pages + PAGE_SIZE);
1055 #endif
1056
1057         sun4c_put_pte(addr, BUCKET_PTE(pages));
1058 #ifndef CONFIG_SUN4
1059         sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1060 #endif
1061
1062 #ifdef CONFIG_DEBUG_STACK_USAGE
1063         memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1064 #endif /* DEBUG_STACK_USAGE */
1065
1066         return (struct thread_info *) addr;
1067 }
1068
1069 static void sun4c_free_thread_info(struct thread_info *ti)
1070 {
1071         unsigned long tiaddr = (unsigned long) ti;
1072         unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1073         int entry = BUCKET_NUM(tiaddr);
1074
1075         /* We are deleting a mapping, so the flush here is mandatory. */
1076         sun4c_flush_page(tiaddr);
1077 #ifndef CONFIG_SUN4
1078         sun4c_flush_page(tiaddr + PAGE_SIZE);
1079 #endif
1080         sun4c_put_pte(tiaddr, 0);
1081 #ifndef CONFIG_SUN4
1082         sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1083 #endif
1084         sun4c_bucket[entry] = BUCKET_EMPTY;
1085         if (entry < sun4c_lowbucket_avail)
1086                 sun4c_lowbucket_avail = entry;
1087
1088         free_pages(pages, THREAD_INFO_ORDER);
1089         garbage_collect(entry);
1090 }
1091
1092 static void __init sun4c_init_buckets(void)
1093 {
1094         int entry;
1095
1096         if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1097                 extern void thread_info_size_is_bolixed_pete(void);
1098                 thread_info_size_is_bolixed_pete();
1099         }
1100
1101         for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1102                 sun4c_bucket[entry] = BUCKET_EMPTY;
1103         sun4c_lowbucket_avail = 0;
1104 }
1105
1106 static unsigned long sun4c_iobuffer_start;
1107 static unsigned long sun4c_iobuffer_end;
1108 static unsigned long sun4c_iobuffer_high;
1109 static unsigned long *sun4c_iobuffer_map;
1110 static int iobuffer_map_size;
1111
1112 /*
1113  * Alias our pages so they do not cause a trap.
1114  * Also one page may be aliased into several I/O areas and we may
1115  * finish these I/O separately.
1116  */
1117 static char *sun4c_lockarea(char *vaddr, unsigned long size)
1118 {
1119         unsigned long base, scan;
1120         unsigned long npages;
1121         unsigned long vpage;
1122         unsigned long pte;
1123         unsigned long apage;
1124         unsigned long high;
1125         unsigned long flags;
1126
1127         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1128                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1129
1130         scan = 0;
1131         local_irq_save(flags);
1132         for (;;) {
1133                 scan = find_next_zero_bit(sun4c_iobuffer_map,
1134                                           iobuffer_map_size, scan);
1135                 if ((base = scan) + npages > iobuffer_map_size) goto abend;
1136                 for (;;) {
1137                         if (scan >= base + npages) goto found;
1138                         if (test_bit(scan, sun4c_iobuffer_map)) break;
1139                         scan++;
1140                 }
1141         }
1142
1143 found:
1144         high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1145         high = SUN4C_REAL_PGDIR_ALIGN(high);
1146         while (high > sun4c_iobuffer_high) {
1147                 get_locked_segment(sun4c_iobuffer_high);
1148                 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1149         }
1150
1151         vpage = ((unsigned long) vaddr) & PAGE_MASK;
1152         for (scan = base; scan < base+npages; scan++) {
1153                 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1154                 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1155                 pte |= _SUN4C_PAGE_NOCACHE;
1156                 set_bit(scan, sun4c_iobuffer_map);
1157                 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1158
1159                 /* Flush original mapping so we see the right things later. */
1160                 sun4c_flush_page(vpage);
1161
1162                 sun4c_put_pte(apage, pte);
1163                 vpage += PAGE_SIZE;
1164         }
1165         local_irq_restore(flags);
1166         return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1167                          (((unsigned long) vaddr) & ~PAGE_MASK));
1168
1169 abend:
1170         local_irq_restore(flags);
1171         printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1172         panic("Out of iobuffer table");
1173         return NULL;
1174 }
1175
1176 static void sun4c_unlockarea(char *vaddr, unsigned long size)
1177 {
1178         unsigned long vpage, npages;
1179         unsigned long flags;
1180         int scan, high;
1181
1182         vpage = (unsigned long)vaddr & PAGE_MASK;
1183         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1184                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1185
1186         local_irq_save(flags);
1187         while (npages != 0) {
1188                 --npages;
1189
1190                 /* This mapping is marked non-cachable, no flush necessary. */
1191                 sun4c_put_pte(vpage, 0);
1192                 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1193                           sun4c_iobuffer_map);
1194                 vpage += PAGE_SIZE;
1195         }
1196
1197         /* garbage collect */
1198         scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1199         while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1200                 scan -= 32;
1201         scan += 32;
1202         high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1203         high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1204         while (high < sun4c_iobuffer_high) {
1205                 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1206                 free_locked_segment(sun4c_iobuffer_high);
1207         }
1208         local_irq_restore(flags);
1209 }
1210
1211 /* Note the scsi code at init time passes to here buffers
1212  * which sit on the kernel stack, those are already locked
1213  * by implication and fool the page locking code above
1214  * if passed to by mistake.
1215  */
1216 static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1217 {
1218         unsigned long page;
1219
1220         page = ((unsigned long)bufptr) & PAGE_MASK;
1221         if (!virt_addr_valid(page)) {
1222                 sun4c_flush_page(page);
1223                 return (__u32)bufptr; /* already locked */
1224         }
1225         return (__u32)sun4c_lockarea(bufptr, len);
1226 }
1227
1228 static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1229 {
1230         while (sz != 0) {
1231                 --sz;
1232                 sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
1233                 sg[sz].dvma_length = sg[sz].length;
1234         }
1235 }
1236
1237 static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1238 {
1239         if (bufptr < sun4c_iobuffer_start)
1240                 return; /* On kernel stack or similar, see above */
1241         sun4c_unlockarea((char *)bufptr, len);
1242 }
1243
1244 static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1245 {
1246         while (sz != 0) {
1247                 --sz;
1248                 sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length);
1249         }
1250 }
1251
1252 #define TASK_ENTRY_SIZE    BUCKET_SIZE /* see above */
1253 #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1254
1255 struct vm_area_struct sun4c_kstack_vma;
1256
1257 static void __init sun4c_init_lock_areas(void)
1258 {
1259         unsigned long sun4c_taskstack_start;
1260         unsigned long sun4c_taskstack_end;
1261         int bitmap_size;
1262
1263         sun4c_init_buckets();
1264         sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1265         sun4c_taskstack_end = (sun4c_taskstack_start +
1266                                (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1267         if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1268                 prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1269                 prom_halt();
1270         }
1271
1272         sun4c_iobuffer_start = sun4c_iobuffer_high =
1273                                 SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1274         sun4c_iobuffer_end = SUN4C_LOCK_END;
1275         bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1276         bitmap_size = (bitmap_size + 7) >> 3;
1277         bitmap_size = LONG_ALIGN(bitmap_size);
1278         iobuffer_map_size = bitmap_size << 3;
1279         sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1280         memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1281
1282         sun4c_kstack_vma.vm_mm = &init_mm;
1283         sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1284         sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1285         sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1286         sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1287         insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1288 }
1289
1290 /* Cache flushing on the sun4c. */
1291 static void sun4c_flush_cache_all(void)
1292 {
1293         unsigned long begin, end;
1294
1295         flush_user_windows();
1296         begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1297         end = (begin + SUN4C_VAC_SIZE);
1298
1299         if (sun4c_vacinfo.linesize == 32) {
1300                 while (begin < end) {
1301                         __asm__ __volatile__(
1302                         "ld     [%0 + 0x00], %%g0\n\t"
1303                         "ld     [%0 + 0x20], %%g0\n\t"
1304                         "ld     [%0 + 0x40], %%g0\n\t"
1305                         "ld     [%0 + 0x60], %%g0\n\t"
1306                         "ld     [%0 + 0x80], %%g0\n\t"
1307                         "ld     [%0 + 0xa0], %%g0\n\t"
1308                         "ld     [%0 + 0xc0], %%g0\n\t"
1309                         "ld     [%0 + 0xe0], %%g0\n\t"
1310                         "ld     [%0 + 0x100], %%g0\n\t"
1311                         "ld     [%0 + 0x120], %%g0\n\t"
1312                         "ld     [%0 + 0x140], %%g0\n\t"
1313                         "ld     [%0 + 0x160], %%g0\n\t"
1314                         "ld     [%0 + 0x180], %%g0\n\t"
1315                         "ld     [%0 + 0x1a0], %%g0\n\t"
1316                         "ld     [%0 + 0x1c0], %%g0\n\t"
1317                         "ld     [%0 + 0x1e0], %%g0\n"
1318                         : : "r" (begin));
1319                         begin += 512;
1320                 }
1321         } else {
1322                 while (begin < end) {
1323                         __asm__ __volatile__(
1324                         "ld     [%0 + 0x00], %%g0\n\t"
1325                         "ld     [%0 + 0x10], %%g0\n\t"
1326                         "ld     [%0 + 0x20], %%g0\n\t"
1327                         "ld     [%0 + 0x30], %%g0\n\t"
1328                         "ld     [%0 + 0x40], %%g0\n\t"
1329                         "ld     [%0 + 0x50], %%g0\n\t"
1330                         "ld     [%0 + 0x60], %%g0\n\t"
1331                         "ld     [%0 + 0x70], %%g0\n\t"
1332                         "ld     [%0 + 0x80], %%g0\n\t"
1333                         "ld     [%0 + 0x90], %%g0\n\t"
1334                         "ld     [%0 + 0xa0], %%g0\n\t"
1335                         "ld     [%0 + 0xb0], %%g0\n\t"
1336                         "ld     [%0 + 0xc0], %%g0\n\t"
1337                         "ld     [%0 + 0xd0], %%g0\n\t"
1338                         "ld     [%0 + 0xe0], %%g0\n\t"
1339                         "ld     [%0 + 0xf0], %%g0\n"
1340                         : : "r" (begin));
1341                         begin += 256;
1342                 }
1343         }
1344 }
1345
1346 static void sun4c_flush_cache_mm(struct mm_struct *mm)
1347 {
1348         int new_ctx = mm->context;
1349
1350         if (new_ctx != NO_CONTEXT) {
1351                 flush_user_windows();
1352
1353                 if (sun4c_context_ring[new_ctx].num_entries) {
1354                         struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1355                         unsigned long flags;
1356
1357                         local_irq_save(flags);
1358                         if (head->next != head) {
1359                                 struct sun4c_mmu_entry *entry = head->next;
1360                                 int savectx = sun4c_get_context();
1361
1362                                 sun4c_set_context(new_ctx);
1363                                 sun4c_flush_context();
1364                                 do {
1365                                         struct sun4c_mmu_entry *next = entry->next;
1366
1367                                         sun4c_user_unmap(entry);
1368                                         free_user_entry(new_ctx, entry);
1369
1370                                         entry = next;
1371                                 } while (entry != head);
1372                                 sun4c_set_context(savectx);
1373                         }
1374                         local_irq_restore(flags);
1375                 }
1376         }
1377 }
1378
1379 static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1380 {
1381         struct mm_struct *mm = vma->vm_mm;
1382         int new_ctx = mm->context;
1383
1384         if (new_ctx != NO_CONTEXT) {
1385                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1386                 struct sun4c_mmu_entry *entry;
1387                 unsigned long flags;
1388
1389                 flush_user_windows();
1390
1391                 local_irq_save(flags);
1392                 /* All user segmap chains are ordered on entry->vaddr. */
1393                 for (entry = head->next;
1394                      (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1395                      entry = entry->next)
1396                         ;
1397
1398                 /* Tracing various job mixtures showed that this conditional
1399                  * only passes ~35% of the time for most worse case situations,
1400                  * therefore we avoid all of this gross overhead ~65% of the time.
1401                  */
1402                 if ((entry != head) && (entry->vaddr < end)) {
1403                         int octx = sun4c_get_context();
1404                         sun4c_set_context(new_ctx);
1405
1406                         /* At this point, always, (start >= entry->vaddr) and
1407                          * (entry->vaddr < end), once the latter condition
1408                          * ceases to hold, or we hit the end of the list, we
1409                          * exit the loop.  The ordering of all user allocated
1410                          * segmaps makes this all work out so beautifully.
1411                          */
1412                         do {
1413                                 struct sun4c_mmu_entry *next = entry->next;
1414                                 unsigned long realend;
1415
1416                                 /* "realstart" is always >= entry->vaddr */
1417                                 realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1418                                 if (end < realend)
1419                                         realend = end;
1420                                 if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1421                                         unsigned long page = entry->vaddr;
1422                                         while (page < realend) {
1423                                                 sun4c_flush_page(page);
1424                                                 page += PAGE_SIZE;
1425                                         }
1426                                 } else {
1427                                         sun4c_flush_segment(entry->vaddr);
1428                                         sun4c_user_unmap(entry);
1429                                         free_user_entry(new_ctx, entry);
1430                                 }
1431                                 entry = next;
1432                         } while ((entry != head) && (entry->vaddr < end));
1433                         sun4c_set_context(octx);
1434                 }
1435                 local_irq_restore(flags);
1436         }
1437 }
1438
1439 static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1440 {
1441         struct mm_struct *mm = vma->vm_mm;
1442         int new_ctx = mm->context;
1443
1444         /* Sun4c has no separate I/D caches so cannot optimize for non
1445          * text page flushes.
1446          */
1447         if (new_ctx != NO_CONTEXT) {
1448                 int octx = sun4c_get_context();
1449                 unsigned long flags;
1450
1451                 flush_user_windows();
1452                 local_irq_save(flags);
1453                 sun4c_set_context(new_ctx);
1454                 sun4c_flush_page(page);
1455                 sun4c_set_context(octx);
1456                 local_irq_restore(flags);
1457         }
1458 }
1459
1460 static void sun4c_flush_page_to_ram(unsigned long page)
1461 {
1462         unsigned long flags;
1463
1464         local_irq_save(flags);
1465         sun4c_flush_page(page);
1466         local_irq_restore(flags);
1467 }
1468
1469 /* Sun4c cache is unified, both instructions and data live there, so
1470  * no need to flush the on-stack instructions for new signal handlers.
1471  */
1472 static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1473 {
1474 }
1475
1476 /* TLB flushing on the sun4c.  These routines count on the cache
1477  * flushing code to flush the user register windows so that we need
1478  * not do so when we get here.
1479  */
1480
1481 static void sun4c_flush_tlb_all(void)
1482 {
1483         struct sun4c_mmu_entry *this_entry, *next_entry;
1484         unsigned long flags;
1485         int savectx, ctx;
1486
1487         local_irq_save(flags);
1488         this_entry = sun4c_kernel_ring.ringhd.next;
1489         savectx = sun4c_get_context();
1490         flush_user_windows();
1491         while (sun4c_kernel_ring.num_entries) {
1492                 next_entry = this_entry->next;
1493                 sun4c_flush_segment(this_entry->vaddr);
1494                 for (ctx = 0; ctx < num_contexts; ctx++) {
1495                         sun4c_set_context(ctx);
1496                         sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1497                 }
1498                 free_kernel_entry(this_entry, &sun4c_kernel_ring);
1499                 this_entry = next_entry;
1500         }
1501         sun4c_set_context(savectx);
1502         local_irq_restore(flags);
1503 }
1504
1505 static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1506 {
1507         int new_ctx = mm->context;
1508
1509         if (new_ctx != NO_CONTEXT) {
1510                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1511                 unsigned long flags;
1512
1513                 local_irq_save(flags);
1514                 if (head->next != head) {
1515                         struct sun4c_mmu_entry *entry = head->next;
1516                         int savectx = sun4c_get_context();
1517
1518                         sun4c_set_context(new_ctx);
1519                         sun4c_flush_context();
1520                         do {
1521                                 struct sun4c_mmu_entry *next = entry->next;
1522
1523                                 sun4c_user_unmap(entry);
1524                                 free_user_entry(new_ctx, entry);
1525
1526                                 entry = next;
1527                         } while (entry != head);
1528                         sun4c_set_context(savectx);
1529                 }
1530                 local_irq_restore(flags);
1531         }
1532 }
1533
1534 static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1535 {
1536         struct mm_struct *mm = vma->vm_mm;
1537         int new_ctx = mm->context;
1538
1539         if (new_ctx != NO_CONTEXT) {
1540                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1541                 struct sun4c_mmu_entry *entry;
1542                 unsigned long flags;
1543
1544                 local_irq_save(flags);
1545                 /* See commentary in sun4c_flush_cache_range(). */
1546                 for (entry = head->next;
1547                      (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1548                      entry = entry->next)
1549                         ;
1550
1551                 if ((entry != head) && (entry->vaddr < end)) {
1552                         int octx = sun4c_get_context();
1553
1554                         sun4c_set_context(new_ctx);
1555                         do {
1556                                 struct sun4c_mmu_entry *next = entry->next;
1557
1558                                 sun4c_flush_segment(entry->vaddr);
1559                                 sun4c_user_unmap(entry);
1560                                 free_user_entry(new_ctx, entry);
1561
1562                                 entry = next;
1563                         } while ((entry != head) && (entry->vaddr < end));
1564                         sun4c_set_context(octx);
1565                 }
1566                 local_irq_restore(flags);
1567         }
1568 }
1569
1570 static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1571 {
1572         struct mm_struct *mm = vma->vm_mm;
1573         int new_ctx = mm->context;
1574
1575         if (new_ctx != NO_CONTEXT) {
1576                 int savectx = sun4c_get_context();
1577                 unsigned long flags;
1578
1579                 local_irq_save(flags);
1580                 sun4c_set_context(new_ctx);
1581                 page &= PAGE_MASK;
1582                 sun4c_flush_page(page);
1583                 sun4c_put_pte(page, 0);
1584                 sun4c_set_context(savectx);
1585                 local_irq_restore(flags);
1586         }
1587 }
1588
1589 static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1590 {
1591         unsigned long page_entry, pg_iobits;
1592
1593         pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
1594                     _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
1595
1596         page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1597         page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1598         sun4c_put_pte(virt_addr, page_entry);
1599 }
1600
1601 static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1602     unsigned long xva, unsigned int len)
1603 {
1604         while (len != 0) {
1605                 len -= PAGE_SIZE;
1606                 sun4c_mapioaddr(xpa, xva);
1607                 xva += PAGE_SIZE;
1608                 xpa += PAGE_SIZE;
1609         }
1610 }
1611
1612 static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1613 {
1614         while (len != 0) {
1615                 len -= PAGE_SIZE;
1616                 sun4c_put_pte(virt_addr, 0);
1617                 virt_addr += PAGE_SIZE;
1618         }
1619 }
1620
1621 static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1622 {
1623         struct ctx_list *ctxp;
1624
1625         ctxp = ctx_free.next;
1626         if (ctxp != &ctx_free) {
1627                 remove_from_ctx_list(ctxp);
1628                 add_to_used_ctxlist(ctxp);
1629                 mm->context = ctxp->ctx_number;
1630                 ctxp->ctx_mm = mm;
1631                 return;
1632         }
1633         ctxp = ctx_used.next;
1634         if (ctxp->ctx_mm == old_mm)
1635                 ctxp = ctxp->next;
1636         remove_from_ctx_list(ctxp);
1637         add_to_used_ctxlist(ctxp);
1638         ctxp->ctx_mm->context = NO_CONTEXT;
1639         ctxp->ctx_mm = mm;
1640         mm->context = ctxp->ctx_number;
1641         sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1642                                ctxp->ctx_number);
1643 }
1644
1645 /* Switch the current MM context. */
1646 static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1647 {
1648         struct ctx_list *ctx;
1649         int dirty = 0;
1650
1651         if (mm->context == NO_CONTEXT) {
1652                 dirty = 1;
1653                 sun4c_alloc_context(old_mm, mm);
1654         } else {
1655                 /* Update the LRU ring of contexts. */
1656                 ctx = ctx_list_pool + mm->context;
1657                 remove_from_ctx_list(ctx);
1658                 add_to_used_ctxlist(ctx);
1659         }
1660         if (dirty || old_mm != mm)
1661                 sun4c_set_context(mm->context);
1662 }
1663
1664 static void sun4c_destroy_context(struct mm_struct *mm)
1665 {
1666         struct ctx_list *ctx_old;
1667
1668         if (mm->context != NO_CONTEXT) {
1669                 sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1670                 ctx_old = ctx_list_pool + mm->context;
1671                 remove_from_ctx_list(ctx_old);
1672                 add_to_free_ctxlist(ctx_old);
1673                 mm->context = NO_CONTEXT;
1674         }
1675 }
1676
1677 static void sun4c_mmu_info(struct seq_file *m)
1678 {
1679         int used_user_entries, i;
1680
1681         used_user_entries = 0;
1682         for (i = 0; i < num_contexts; i++)
1683                 used_user_entries += sun4c_context_ring[i].num_entries;
1684
1685         seq_printf(m,
1686                    "vacsize\t\t: %d bytes\n"
1687                    "vachwflush\t: %s\n"
1688                    "vaclinesize\t: %d bytes\n"
1689                    "mmuctxs\t\t: %d\n"
1690                    "mmupsegs\t: %d\n"
1691                    "kernelpsegs\t: %d\n"
1692                    "kfreepsegs\t: %d\n"
1693                    "usedpsegs\t: %d\n"
1694                    "ufreepsegs\t: %d\n"
1695                    "user_taken\t: %d\n"
1696                    "max_taken\t: %d\n",
1697                    sun4c_vacinfo.num_bytes,
1698                    (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1699                    sun4c_vacinfo.linesize,
1700                    num_contexts,
1701                    (invalid_segment + 1),
1702                    sun4c_kernel_ring.num_entries,
1703                    sun4c_kfree_ring.num_entries,
1704                    used_user_entries,
1705                    sun4c_ufree_ring.num_entries,
1706                    sun4c_user_taken_entries,
1707                    max_user_taken_entries);
1708 }
1709
1710 /* Nothing below here should touch the mmu hardware nor the mmu_entry
1711  * data structures.
1712  */
1713
1714 /* First the functions which the mid-level code uses to directly
1715  * manipulate the software page tables.  Some defines since we are
1716  * emulating the i386 page directory layout.
1717  */
1718 #define PGD_PRESENT  0x001
1719 #define PGD_RW       0x002
1720 #define PGD_USER     0x004
1721 #define PGD_ACCESSED 0x020
1722 #define PGD_DIRTY    0x040
1723 #define PGD_TABLE    (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1724
1725 static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1726 {
1727         *ptep = pte;
1728 }
1729
1730 static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1731 {
1732 }
1733
1734 static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1735 {
1736         pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1737 }
1738
1739 static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1740 {
1741         if (page_address(ptep) == NULL) BUG();  /* No highmem on sun4c */
1742         pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1743 }
1744
1745 static int sun4c_pte_present(pte_t pte)
1746 {
1747         return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1748 }
1749 static void sun4c_pte_clear(pte_t *ptep)        { *ptep = __pte(0); }
1750
1751 static int sun4c_pte_read(pte_t pte)
1752 {
1753         return (pte_val(pte) & _SUN4C_PAGE_READ);
1754 }
1755
1756 static int sun4c_pmd_bad(pmd_t pmd)
1757 {
1758         return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1759                 (!virt_addr_valid(pmd_val(pmd))));
1760 }
1761
1762 static int sun4c_pmd_present(pmd_t pmd)
1763 {
1764         return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1765 }
1766
1767 #if 0 /* if PMD takes one word */
1768 static void sun4c_pmd_clear(pmd_t *pmdp)        { *pmdp = __pmd(0); }
1769 #else /* if pmd_t is a longish aggregate */
1770 static void sun4c_pmd_clear(pmd_t *pmdp) {
1771         memset((void *)pmdp, 0, sizeof(pmd_t));
1772 }
1773 #endif
1774
1775 static int sun4c_pgd_none(pgd_t pgd)            { return 0; }
1776 static int sun4c_pgd_bad(pgd_t pgd)             { return 0; }
1777 static int sun4c_pgd_present(pgd_t pgd)         { return 1; }
1778 static void sun4c_pgd_clear(pgd_t * pgdp)       { }
1779
1780 /*
1781  * The following only work if pte_present() is true.
1782  * Undefined behaviour if not..
1783  */
1784 static pte_t sun4c_pte_mkwrite(pte_t pte)
1785 {
1786         pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1787         if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1788                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1789         return pte;
1790 }
1791
1792 static pte_t sun4c_pte_mkdirty(pte_t pte)
1793 {
1794         pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1795         if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1796                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1797         return pte;
1798 }
1799
1800 static pte_t sun4c_pte_mkyoung(pte_t pte)
1801 {
1802         pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1803         if (pte_val(pte) & _SUN4C_PAGE_READ)
1804                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1805         return pte;
1806 }
1807
1808 /*
1809  * Conversion functions: convert a page and protection to a page entry,
1810  * and a page entry and page directory to the page they refer to.
1811  */
1812 static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1813 {
1814         return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1815 }
1816
1817 static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1818 {
1819         return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1820 }
1821
1822 static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1823 {
1824         return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1825 }
1826
1827 static unsigned long sun4c_pte_pfn(pte_t pte)
1828 {
1829         return pte_val(pte) & SUN4C_PFN_MASK;
1830 }
1831
1832 static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1833 {
1834         return __pte(pgoff | _SUN4C_PAGE_FILE);
1835 }
1836
1837 static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1838 {
1839         return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1840 }
1841
1842
1843 static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd)
1844 {
1845         return (pmd_val(pmd) & PAGE_MASK);
1846 }
1847
1848 static struct page *sun4c_pmd_page(pmd_t pmd)
1849 {
1850         return virt_to_page(sun4c_pmd_page_v(pmd));
1851 }
1852
1853 static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1854
1855 /* to find an entry in a page-table-directory */
1856 static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1857 {
1858         return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1859 }
1860
1861 /* Find an entry in the second-level page table.. */
1862 static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1863 {
1864         return (pmd_t *) dir;
1865 }
1866
1867 /* Find an entry in the third-level page table.. */
1868 pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1869 {
1870         return (pte_t *) sun4c_pmd_page_v(*dir) +
1871                         ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1872 }
1873
1874 static unsigned long sun4c_swp_type(swp_entry_t entry)
1875 {
1876         return (entry.val & SUN4C_SWP_TYPE_MASK);
1877 }
1878
1879 static unsigned long sun4c_swp_offset(swp_entry_t entry)
1880 {
1881         return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1882 }
1883
1884 static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1885 {
1886         return (swp_entry_t) {
1887                   (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1888                 | (type & SUN4C_SWP_TYPE_MASK) };
1889 }
1890
1891 static void sun4c_free_pte_slow(pte_t *pte)
1892 {
1893         free_page((unsigned long)pte);
1894 }
1895
1896 static void sun4c_free_pgd_slow(pgd_t *pgd)
1897 {
1898         free_page((unsigned long)pgd);
1899 }
1900
1901 static pgd_t *sun4c_get_pgd_fast(void)
1902 {
1903         unsigned long *ret;
1904
1905         if ((ret = pgd_quicklist) != NULL) {
1906                 pgd_quicklist = (unsigned long *)(*ret);
1907                 ret[0] = ret[1];
1908                 pgtable_cache_size--;
1909         } else {
1910                 pgd_t *init;
1911
1912                 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1913                 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1914                 init = sun4c_pgd_offset(&init_mm, 0);
1915                 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1916                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1917         }
1918         return (pgd_t *)ret;
1919 }
1920
1921 static void sun4c_free_pgd_fast(pgd_t *pgd)
1922 {
1923         *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1924         pgd_quicklist = (unsigned long *) pgd;
1925         pgtable_cache_size++;
1926 }
1927
1928
1929 static __inline__ pte_t *
1930 sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1931 {
1932         unsigned long *ret;
1933
1934         if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1935                 pte_quicklist = (unsigned long *)(*ret);
1936                 ret[0] = ret[1];
1937                 pgtable_cache_size--;
1938         }
1939         return (pte_t *)ret;
1940 }
1941
1942 static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1943 {
1944         pte_t *pte;
1945
1946         if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1947                 return pte;
1948
1949         pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
1950         if (pte)
1951                 memset(pte, 0, PAGE_SIZE);
1952         return pte;
1953 }
1954
1955 static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1956 {
1957         pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
1958         if (pte == NULL)
1959                 return NULL;
1960         return virt_to_page(pte);
1961 }
1962
1963 static __inline__ void sun4c_free_pte_fast(pte_t *pte)
1964 {
1965         *(unsigned long *)pte = (unsigned long) pte_quicklist;
1966         pte_quicklist = (unsigned long *) pte;
1967         pgtable_cache_size++;
1968 }
1969
1970 static void sun4c_pte_free(struct page *pte)
1971 {
1972         sun4c_free_pte_fast(page_address(pte));
1973 }
1974
1975 /*
1976  * allocating and freeing a pmd is trivial: the 1-entry pmd is
1977  * inside the pgd, so has no extra memory associated with it.
1978  */
1979 static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1980 {
1981         BUG();
1982         return NULL;
1983 }
1984
1985 static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1986
1987 static void sun4c_check_pgt_cache(int low, int high)
1988 {
1989         if (pgtable_cache_size > high) {
1990                 do {
1991                         if (pgd_quicklist)
1992                                 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1993                         if (pte_quicklist)
1994                                 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1995                 } while (pgtable_cache_size > low);
1996         }
1997 }
1998
1999 /* An experiment, turn off by default for now... -DaveM */
2000 #define SUN4C_PRELOAD_PSEG
2001
2002 void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
2003 {
2004         unsigned long flags;
2005         int pseg;
2006
2007         local_irq_save(flags);
2008         address &= PAGE_MASK;
2009         if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2010                 struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2011                 struct mm_struct *mm = vma->vm_mm;
2012                 unsigned long start, end;
2013
2014                 entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2015                 entry->ctx = mm->context;
2016                 add_ring_ordered(sun4c_context_ring + mm->context, entry);
2017                 sun4c_put_segmap(entry->vaddr, entry->pseg);
2018                 end = start + SUN4C_REAL_PGDIR_SIZE;
2019                 while (start < end) {
2020 #ifdef SUN4C_PRELOAD_PSEG
2021                         pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2022                         pte_t *ptep;
2023
2024                         if (!pgdp)
2025                                 goto no_mapping;
2026                         ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2027                         if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2028                                 goto no_mapping;
2029                         sun4c_put_pte(start, pte_val(*ptep));
2030                         goto next;
2031
2032                 no_mapping:
2033 #endif
2034                         sun4c_put_pte(start, 0);
2035 #ifdef SUN4C_PRELOAD_PSEG
2036                 next:
2037 #endif
2038                         start += PAGE_SIZE;
2039                 }
2040 #ifndef SUN4C_PRELOAD_PSEG
2041                 sun4c_put_pte(address, pte_val(pte));
2042 #endif
2043                 local_irq_restore(flags);
2044                 return;
2045         } else {
2046                 struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2047
2048                 remove_lru(entry);
2049                 add_lru(entry);
2050         }
2051
2052         sun4c_put_pte(address, pte_val(pte));
2053         local_irq_restore(flags);
2054 }
2055
2056 extern void sparc_context_init(int);
2057 extern unsigned long end;
2058 extern unsigned long bootmem_init(unsigned long *pages_avail);
2059 extern unsigned long last_valid_pfn;
2060
2061 void __init sun4c_paging_init(void)
2062 {
2063         int i, cnt;
2064         unsigned long kernel_end, vaddr;
2065         extern struct resource sparc_iomap;
2066         unsigned long end_pfn, pages_avail;
2067
2068         kernel_end = (unsigned long) &end;
2069         kernel_end += (SUN4C_REAL_PGDIR_SIZE * 4);
2070         kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2071
2072         pages_avail = 0;
2073         last_valid_pfn = bootmem_init(&pages_avail);
2074         end_pfn = last_valid_pfn;
2075
2076         sun4c_probe_mmu();
2077         invalid_segment = (num_segmaps - 1);
2078         sun4c_init_mmu_entry_pool();
2079         sun4c_init_rings();
2080         sun4c_init_map_kernelprom(kernel_end);
2081         sun4c_init_clean_mmu(kernel_end);
2082         sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2083         sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2084         sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2085         sun4c_init_lock_areas();
2086         sun4c_init_fill_user_ring();
2087
2088         sun4c_set_context(0);
2089         memset(swapper_pg_dir, 0, PAGE_SIZE);
2090         memset(pg0, 0, PAGE_SIZE);
2091         memset(pg1, 0, PAGE_SIZE);
2092         memset(pg2, 0, PAGE_SIZE);
2093         memset(pg3, 0, PAGE_SIZE);
2094
2095         /* Save work later. */
2096         vaddr = VMALLOC_START;
2097         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2098         vaddr += SUN4C_PGDIR_SIZE;
2099         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2100         vaddr += SUN4C_PGDIR_SIZE;
2101         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2102         vaddr += SUN4C_PGDIR_SIZE;
2103         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2104         sun4c_init_ss2_cache_bug();
2105         sparc_context_init(num_contexts);
2106
2107         {
2108                 unsigned long zones_size[MAX_NR_ZONES];
2109                 unsigned long zholes_size[MAX_NR_ZONES];
2110                 unsigned long npages;
2111                 int znum;
2112
2113                 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2114                         zones_size[znum] = zholes_size[znum] = 0;
2115
2116                 npages = max_low_pfn - pfn_base;
2117
2118                 zones_size[ZONE_DMA] = npages;
2119                 zholes_size[ZONE_DMA] = npages - pages_avail;
2120
2121                 npages = highend_pfn - max_low_pfn;
2122                 zones_size[ZONE_HIGHMEM] = npages;
2123                 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2124
2125                 free_area_init_node(0, &contig_page_data, zones_size,
2126                                     pfn_base, zholes_size);
2127         }
2128
2129         cnt = 0;
2130         for (i = 0; i < num_segmaps; i++)
2131                 if (mmu_entry_pool[i].locked)
2132                         cnt++;
2133
2134         max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2135
2136         printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2137 }
2138
2139 static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2140 {
2141         prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2142
2143         return prot;
2144 }
2145
2146 /* Load up routines and constants for sun4c mmu */
2147 void __init ld_mmu_sun4c(void)
2148 {
2149         extern void ___xchg32_sun4c(void);
2150
2151         printk("Loading sun4c MMU routines\n");
2152
2153         /* First the constants */
2154         BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2155         BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2156         BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2157
2158         BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2159         BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2160         BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2161
2162         BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2163         BTFIXUPSET_INT(page_shared, pgprot_val(SUN4C_PAGE_SHARED));
2164         BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2165         BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2166         BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2167         page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2168
2169         /* Functions */
2170         BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
2171         BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2172         BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2173
2174         BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2175
2176         if (sun4c_vacinfo.do_hwflushes) {
2177                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2178                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2179                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2180         } else {
2181                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2182                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2183                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2184         }
2185
2186         BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2187         BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2188         BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2189         BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2190         BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2191         BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2192         BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2193         BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2194         BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2195         BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2196
2197         BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2198
2199         BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2200
2201         /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2202         /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */  /* Defaults to zero? */
2203
2204         BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2205 #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2206         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2207 #else
2208         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2209 #endif
2210         BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2211         BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2212
2213         BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2214         BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2215         BTFIXUPSET_CALL(pte_read, sun4c_pte_read, BTFIXUPCALL_NORM);
2216
2217         BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2218         BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2219         BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2220
2221         BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2222         BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2223         BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2224         BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2225
2226         BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2227         BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2228         BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2229
2230         BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2231         BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2232         BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2233         BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2234         BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2235         BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2236         BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2237         BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2238         BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2239         BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2240         BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2241
2242         BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2243         BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2244         BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2245         BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2246         BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2247         BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2248         BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2249         BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2250         BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2251         BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2252         BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2253
2254         BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2255         BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2256
2257         BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2258         BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2259
2260         BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2261         BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2262         BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2263         BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2264
2265         BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2266         BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2267         BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2268
2269         BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2270         BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2271
2272         BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2273         BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2274         BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2275
2276         BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2277         BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2278
2279         BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2280
2281         /* These should _never_ get called with two level tables. */
2282         BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2283         BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2284 }