arch/sparc/mm/init_32.c

   1 /*
   2  *  linux/arch/sparc/mm/init.c
   3  *
   4  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  *  Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
   6  *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  *  Copyright (C) 2000 Anton Blanchard (anton@samba.org)
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/signal.h>
  12 #include <linux/sched.h>
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/string.h>
  16 #include <linux/types.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/mman.h>
  19 #include <linux/mm.h>
  20 #include <linux/swap.h>
  21 #include <linux/initrd.h>
  22 #include <linux/init.h>
  23 #include <linux/highmem.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/pagemap.h>
  26 #include <linux/poison.h>
  27
  28 #include <asm/sections.h>
  29 #include <asm/system.h>
  30 #include <asm/vac-ops.h>
  31 #include <asm/page.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/vaddrs.h>
  34 #include <asm/pgalloc.h>        /* bug in asm-generic/tlb.h: check_pgt_cache */
  35 #include <asm/tlb.h>
  36 #include <asm/prom.h>
  37 #include <asm/leon.h>
  38
  39 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  40
  41 unsigned long *sparc_valid_addr_bitmap;
  42 EXPORT_SYMBOL(sparc_valid_addr_bitmap);
  43
  44 unsigned long phys_base;
  45 EXPORT_SYMBOL(phys_base);
  46
  47 unsigned long pfn_base;
  48 EXPORT_SYMBOL(pfn_base);
  49
  50 unsigned long page_kernel;
  51 EXPORT_SYMBOL(page_kernel);
  52
  53 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  54 unsigned long sparc_unmapped_base;
  55
  56 struct pgtable_cache_struct pgt_quicklists;
  57
  58 /* Initial ramdisk setup */
  59 extern unsigned int sparc_ramdisk_image;
  60 extern unsigned int sparc_ramdisk_size;
  61
  62 unsigned long highstart_pfn, highend_pfn;
  63
  64 pte_t *kmap_pte;
  65 pgprot_t kmap_prot;
  66
  67 #define kmap_get_fixmap_pte(vaddr) \
  68         pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
  69
  70 void __init kmap_init(void)
  71 {
  72         /* cache the first kmap pte */
  73         kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
  74         kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
  75 }
  76
  77 void show_mem(void)
  78 {
  79         printk("Mem-info:\n");
  80         show_free_areas();
  81         printk("Free swap:       %6ldkB\n",
  82                nr_swap_pages << (PAGE_SHIFT-10));
  83         printk("%ld pages of RAM\n", totalram_pages);
  84         printk("%ld free pages\n", nr_free_pages());
  85 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */
  86         printk("%ld pages in page table cache\n",pgtable_cache_size);
  87 #ifndef CONFIG_SMP
  88         if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
  89                 printk("%ld entries in page dir cache\n",pgd_cache_size);
  90 #endif
  91 #endif
  92 }
  93
  94 void __init sparc_context_init(int numctx)
  95 {
  96         int ctx;
  97
  98         ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
  99
 100         for(ctx = 0; ctx < numctx; ctx++) {
 101                 struct ctx_list *clist;
 102
 103                 clist = (ctx_list_pool + ctx);
 104                 clist->ctx_number = ctx;
 105                 clist->ctx_mm = NULL;
 106         }
 107         ctx_free.next = ctx_free.prev = &ctx_free;
 108         ctx_used.next = ctx_used.prev = &ctx_used;
 109         for(ctx = 0; ctx < numctx; ctx++)
 110                 add_to_free_ctxlist(ctx_list_pool + ctx);
 111 }
 112
 113 extern unsigned long cmdline_memory_size;
 114 unsigned long last_valid_pfn;
 115
 116 unsigned long calc_highpages(void)
 117 {
 118         int i;
 119         int nr = 0;
 120
 121         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 122                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 123                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 124
 125                 if (end_pfn <= max_low_pfn)
 126                         continue;
 127
 128                 if (start_pfn < max_low_pfn)
 129                         start_pfn = max_low_pfn;
 130
 131                 nr += end_pfn - start_pfn;
 132         }
 133
 134         return nr;
 135 }
 136
 137 static unsigned long calc_max_low_pfn(void)
 138 {
 139         int i;
 140         unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
 141         unsigned long curr_pfn, last_pfn;
 142
 143         last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
 144         for (i = 1; sp_banks[i].num_bytes != 0; i++) {
 145                 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 146
 147                 if (curr_pfn >= tmp) {
 148                         if (last_pfn < tmp)
 149                                 tmp = last_pfn;
 150                         break;
 151                 }
 152
 153                 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 154         }
 155
 156         return tmp;
 157 }
 158
 159 unsigned long __init bootmem_init(unsigned long *pages_avail)
 160 {
 161         unsigned long bootmap_size, start_pfn;
 162         unsigned long end_of_phys_memory = 0UL;
 163         unsigned long bootmap_pfn, bytes_avail, size;
 164         int i;
 165
 166         bytes_avail = 0UL;
 167         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 168                 end_of_phys_memory = sp_banks[i].base_addr +
 169                         sp_banks[i].num_bytes;
 170                 bytes_avail += sp_banks[i].num_bytes;
 171                 if (cmdline_memory_size) {
 172                         if (bytes_avail > cmdline_memory_size) {
 173                                 unsigned long slack = bytes_avail - cmdline_memory_size;
 174
 175                                 bytes_avail -= slack;
 176                                 end_of_phys_memory -= slack;
 177
 178                                 sp_banks[i].num_bytes -= slack;
 179                                 if (sp_banks[i].num_bytes == 0) {
 180                                         sp_banks[i].base_addr = 0xdeadbeef;
 181                                 } else {
 182                                         sp_banks[i+1].num_bytes = 0;
 183                                         sp_banks[i+1].base_addr = 0xdeadbeef;
 184                                 }
 185                                 break;
 186                         }
 187                 }
 188         }
 189
 190         /* Start with page aligned address of last symbol in kernel
 191          * image.
 192          */
 193         start_pfn  = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
 194
 195         /* Now shift down to get the real physical page frame number. */
 196         start_pfn >>= PAGE_SHIFT;
 197
 198         bootmap_pfn = start_pfn;
 199
 200         max_pfn = end_of_phys_memory >> PAGE_SHIFT;
 201
 202         max_low_pfn = max_pfn;
 203         highstart_pfn = highend_pfn = max_pfn;
 204
 205         if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
 206                 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
 207                 max_low_pfn = calc_max_low_pfn();
 208                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 209                     calc_highpages() >> (20 - PAGE_SHIFT));
 210         }
 211
 212 #ifdef CONFIG_BLK_DEV_INITRD
 213         /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
 214         if (sparc_ramdisk_image) {
 215                 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
 216                         sparc_ramdisk_image -= KERNBASE;
 217                 initrd_start = sparc_ramdisk_image + phys_base;
 218                 initrd_end = initrd_start + sparc_ramdisk_size;
 219                 if (initrd_end > end_of_phys_memory) {
 220                         printk(KERN_CRIT "initrd extends beyond end of memory "
 221                                          "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
 222                                initrd_end, end_of_phys_memory);
 223                         initrd_start = 0;
 224                 }
 225                 if (initrd_start) {
 226                         if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
 227                             initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
 228                                 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
 229                 }
 230         }
 231 #endif
 232         /* Initialize the boot-time allocator. */
 233         bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
 234                                          max_low_pfn);
 235
 236         /* Now register the available physical memory with the
 237          * allocator.
 238          */
 239         *pages_avail = 0;
 240         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 241                 unsigned long curr_pfn, last_pfn;
 242
 243                 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 244                 if (curr_pfn >= max_low_pfn)
 245                         break;
 246
 247                 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 248                 if (last_pfn > max_low_pfn)
 249                         last_pfn = max_low_pfn;
 250
 251                 /*
 252                  * .. finally, did all the rounding and playing
 253                  * around just make the area go away?
 254                  */
 255                 if (last_pfn <= curr_pfn)
 256                         continue;
 257
 258                 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
 259                 *pages_avail += last_pfn - curr_pfn;
 260
 261                 free_bootmem(sp_banks[i].base_addr, size);
 262         }
 263
 264 #ifdef CONFIG_BLK_DEV_INITRD
 265         if (initrd_start) {
 266                 /* Reserve the initrd image area. */
 267                 size = initrd_end - initrd_start;
 268                 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
 269                 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 270
 271                 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
 272                 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
 273         }
 274 #endif
 275         /* Reserve the kernel text/data/bss. */
 276         size = (start_pfn << PAGE_SHIFT) - phys_base;
 277         reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
 278         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 279
 280         /* Reserve the bootmem map.   We do not account for it
 281          * in pages_avail because we will release that memory
 282          * in free_all_bootmem.
 283          */
 284         size = bootmap_size;
 285         reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
 286         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 287
 288         return max_pfn;
 289 }
 290
 291 /*
 292  * check_pgt_cache
 293  *
 294  * This is called at the end of unmapping of VMA (zap_page_range),
 295  * to rescan the page cache for architecture specific things,
 296  * presumably something like sun4/sun4c PMEGs. Most architectures
 297  * define check_pgt_cache empty.
 298  *
 299  * We simply copy the 2.4 implementation for now.
 300  */
 301 static int pgt_cache_water[2] = { 25, 50 };
 302
 303 void check_pgt_cache(void)
 304 {
 305         do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
 306 }
 307
 308 /*
 309  * paging_init() sets up the page tables: We call the MMU specific
 310  * init routine based upon the Sun model type on the Sparc.
 311  *
 312  */
 313 extern void sun4c_paging_init(void);
 314 extern void srmmu_paging_init(void);
 315 extern void device_scan(void);
 316
 317 pgprot_t PAGE_SHARED __read_mostly;
 318 EXPORT_SYMBOL(PAGE_SHARED);
 319
 320 void __init paging_init(void)
 321 {
 322         switch(sparc_cpu_model) {
 323         case sun4c:
 324         case sun4e:
 325         case sun4:
 326                 sun4c_paging_init();
 327                 sparc_unmapped_base = 0xe0000000;
 328                 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
 329                 break;
 330         case sparc_leon:
 331                 leon_init();
 332                 /* fall through */
 333         case sun4m:
 334         case sun4d:
 335                 srmmu_paging_init();
 336                 sparc_unmapped_base = 0x50000000;
 337                 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
 338                 break;
 339         default:
 340                 prom_printf("paging_init: Cannot init paging on this Sparc\n");
 341                 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
 342                 prom_printf("paging_init: Halting...\n");
 343                 prom_halt();
 344         };
 345
 346         /* Initialize the protection map with non-constant, MMU dependent values. */
 347         protection_map[0] = PAGE_NONE;
 348         protection_map[1] = PAGE_READONLY;
 349         protection_map[2] = PAGE_COPY;
 350         protection_map[3] = PAGE_COPY;
 351         protection_map[4] = PAGE_READONLY;
 352         protection_map[5] = PAGE_READONLY;
 353         protection_map[6] = PAGE_COPY;
 354         protection_map[7] = PAGE_COPY;
 355         protection_map[8] = PAGE_NONE;
 356         protection_map[9] = PAGE_READONLY;
 357         protection_map[10] = PAGE_SHARED;
 358         protection_map[11] = PAGE_SHARED;
 359         protection_map[12] = PAGE_READONLY;
 360         protection_map[13] = PAGE_READONLY;
 361         protection_map[14] = PAGE_SHARED;
 362         protection_map[15] = PAGE_SHARED;
 363         btfixup();
 364         prom_build_devicetree();
 365         of_fill_in_cpu_data();
 366         device_scan();
 367 }
 368
 369 static void __init taint_real_pages(void)
 370 {
 371         int i;
 372
 373         for (i = 0; sp_banks[i].num_bytes; i++) {
 374                 unsigned long start, end;
 375
 376                 start = sp_banks[i].base_addr;
 377                 end = start + sp_banks[i].num_bytes;
 378
 379                 while (start < end) {
 380                         set_bit(start >> 20, sparc_valid_addr_bitmap);
 381                         start += PAGE_SIZE;
 382                 }
 383         }
 384 }
 385
 386 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
 387 {
 388         unsigned long tmp;
 389
 390 #ifdef CONFIG_DEBUG_HIGHMEM
 391         printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
 392 #endif
 393
 394         for (tmp = start_pfn; tmp < end_pfn; tmp++) {
 395                 struct page *page = pfn_to_page(tmp);
 396
 397                 ClearPageReserved(page);
 398                 init_page_count(page);
 399                 __free_page(page);
 400                 totalhigh_pages++;
 401         }
 402 }
 403
 404 void __init mem_init(void)
 405 {
 406         int codepages = 0;
 407         int datapages = 0;
 408         int initpages = 0;
 409         int reservedpages = 0;
 410         int i;
 411
 412         if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
 413                 prom_printf("BUG: fixmap and pkmap areas overlap\n");
 414                 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
 415                        PKMAP_BASE,
 416                        (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 417                        FIXADDR_START);
 418                 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
 419                 prom_halt();
 420         }
 421
 422
 423         /* Saves us work later. */
 424         memset((void *)&empty_zero_page, 0, PAGE_SIZE);
 425
 426         i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
 427         i += 1;
 428         sparc_valid_addr_bitmap = (unsigned long *)
 429                 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
 430
 431         if (sparc_valid_addr_bitmap == NULL) {
 432                 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
 433                 prom_halt();
 434         }
 435         memset(sparc_valid_addr_bitmap, 0, i << 2);
 436
 437         taint_real_pages();
 438
 439         max_mapnr = last_valid_pfn - pfn_base;
 440         high_memory = __va(max_low_pfn << PAGE_SHIFT);
 441
 442         totalram_pages = free_all_bootmem();
 443
 444         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 445                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 446                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 447
 448                 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
 449
 450                 if (end_pfn <= highstart_pfn)
 451                         continue;
 452
 453                 if (start_pfn < highstart_pfn)
 454                         start_pfn = highstart_pfn;
 455
 456                 map_high_region(start_pfn, end_pfn);
 457         }
 458
 459         totalram_pages += totalhigh_pages;
 460
 461         codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
 462         codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
 463         datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
 464         datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
 465         initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
 466         initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
 467
 468         /* Ignore memory holes for the purpose of counting reserved pages */
 469         for (i=0; i < max_low_pfn; i++)
 470                 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
 471                     && PageReserved(pfn_to_page(i)))
 472                         reservedpages++;
 473
 474         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
 475                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 476                num_physpages << (PAGE_SHIFT - 10),
 477                codepages << (PAGE_SHIFT-10),
 478                reservedpages << (PAGE_SHIFT - 10),
 479                datapages << (PAGE_SHIFT-10),
 480                initpages << (PAGE_SHIFT-10),
 481                totalhigh_pages << (PAGE_SHIFT-10));
 482 }
 483
 484 void free_initmem (void)
 485 {
 486         unsigned long addr;
 487         unsigned long freed;
 488
 489         addr = (unsigned long)(&__init_begin);
 490         freed = (unsigned long)(&__init_end) - addr;
 491         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 492                 struct page *p;
 493
 494                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
 495                 p = virt_to_page(addr);
 496
 497                 ClearPageReserved(p);
 498                 init_page_count(p);
 499                 __free_page(p);
 500                 totalram_pages++;
 501                 num_physpages++;
 502         }
 503         printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
 504                 freed >> 10);
 505 }
 506
 507 #ifdef CONFIG_BLK_DEV_INITRD
 508 void free_initrd_mem(unsigned long start, unsigned long end)
 509 {
 510         if (start < end)
 511                 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
 512                         (end - start) >> 10);
 513         for (; start < end; start += PAGE_SIZE) {
 514                 struct page *p;
 515
 516                 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
 517                 p = virt_to_page(start);
 518
 519                 ClearPageReserved(p);
 520                 init_page_count(p);
 521                 __free_page(p);
 522                 totalram_pages++;
 523                 num_physpages++;
 524         }
 525 }
 526 #endif
 527
 528 void sparc_flush_page_to_ram(struct page *page)
 529 {
 530         unsigned long vaddr = (unsigned long)page_address(page);
 531
 532         if (vaddr)
 533                 __flush_page_to_ram(vaddr);
 534 }
 535 EXPORT_SYMBOL(sparc_flush_page_to_ram);