arch/sparc/mm/sun4c.c

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