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