arch/sparc/mm/init.c

   1 /*  $Id: init.c,v 1.103 2001/11/19 19:03:08 davem Exp $
   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/config.h>
  11 #include <linux/module.h>
  12 #include <linux/signal.h>
  13 #include <linux/sched.h>
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/string.h>
  17 #include <linux/types.h>
  18 #include <linux/ptrace.h>
  19 #include <linux/mman.h>
  20 #include <linux/mm.h>
  21 #include <linux/swap.h>
  22 #include <linux/initrd.h>
  23 #include <linux/init.h>
  24 #include <linux/highmem.h>
  25 #include <linux/bootmem.h>
  26
  27 #include <asm/system.h>
  28 #include <asm/segment.h>
  29 #include <asm/vac-ops.h>
  30 #include <asm/page.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/vaddrs.h>
  33 #include <asm/pgalloc.h>        /* bug in asm-generic/tlb.h: check_pgt_cache */
  34 #include <asm/tlb.h>
  35
  36 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  37
  38 unsigned long *sparc_valid_addr_bitmap;
  39
  40 unsigned long phys_base;
  41 unsigned long pfn_base;
  42
  43 unsigned long page_kernel;
  44
  45 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  46 unsigned long sparc_unmapped_base;
  47
  48 struct pgtable_cache_struct pgt_quicklists;
  49
  50 /* References to section boundaries */
  51 extern char __init_begin, __init_end, _start, _end, etext , edata;
  52
  53 /* Initial ramdisk setup */
  54 extern unsigned int sparc_ramdisk_image;
  55 extern unsigned int sparc_ramdisk_size;
  56
  57 unsigned long highstart_pfn, highend_pfn;
  58
  59 pte_t *kmap_pte;
  60 pgprot_t kmap_prot;
  61
  62 EXPORT_SYMBOL(kmap_prot);
  63 EXPORT_SYMBOL(kmap_pte);
  64
  65 #define kmap_get_fixmap_pte(vaddr) \
  66         pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
  67
  68 void __init kmap_init(void)
  69 {
  70         /* cache the first kmap pte */
  71         kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
  72         kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
  73 }
  74
  75 void show_mem(void)
  76 {
  77         printk("Mem-info:\n");
  78         show_free_areas();
  79         printk("Free swap:       %6dkB\n",
  80                nr_swap_pages << (PAGE_SHIFT-10));
  81         printk("%ld pages of RAM\n", totalram_pages);
  82         printk("%d free pages\n", nr_free_pages());
  83 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */
  84         printk("%ld pages in page table cache\n",pgtable_cache_size);
  85 #ifndef CONFIG_SMP
  86         if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
  87                 printk("%ld entries in page dir cache\n",pgd_cache_size);
  88 #endif
  89 #endif
  90 }
  91
  92 void __init sparc_context_init(int numctx)
  93 {
  94         int ctx;
  95
  96         ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
  97
  98         for(ctx = 0; ctx < numctx; ctx++) {
  99                 struct ctx_list *clist;
 100
 101                 clist = (ctx_list_pool + ctx);
 102                 clist->ctx_number = ctx;
 103                 clist->ctx_mm = 0;
 104         }
 105         ctx_free.next = ctx_free.prev = &ctx_free;
 106         ctx_used.next = ctx_used.prev = &ctx_used;
 107         for(ctx = 0; ctx < numctx; ctx++)
 108                 add_to_free_ctxlist(ctx_list_pool + ctx);
 109 }
 110
 111 extern unsigned long cmdline_memory_size;
 112 unsigned long last_valid_pfn;
 113
 114 unsigned long calc_highpages(void)
 115 {
 116         int i;
 117         int nr = 0;
 118
 119         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 120                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 121                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 122
 123                 if (end_pfn <= max_low_pfn)
 124                         continue;
 125
 126                 if (start_pfn < max_low_pfn)
 127                         start_pfn = max_low_pfn;
 128
 129                 nr += end_pfn - start_pfn;
 130         }
 131
 132         return nr;
 133 }
 134
 135 unsigned long calc_max_low_pfn(void)
 136 {
 137         int i;
 138         unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
 139         unsigned long curr_pfn, last_pfn;
 140
 141         last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
 142         for (i = 1; sp_banks[i].num_bytes != 0; i++) {
 143                 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 144
 145                 if (curr_pfn >= tmp) {
 146                         if (last_pfn < tmp)
 147                                 tmp = last_pfn;
 148                         break;
 149                 }
 150
 151                 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 152         }
 153
 154         return tmp;
 155 }
 156
 157 unsigned long __init bootmem_init(unsigned long *pages_avail)
 158 {
 159         unsigned long bootmap_size, start_pfn;
 160         unsigned long end_of_phys_memory = 0UL;
 161         unsigned long bootmap_pfn, bytes_avail, size;
 162         int i;
 163
 164         bytes_avail = 0UL;
 165         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 166                 end_of_phys_memory = sp_banks[i].base_addr +
 167                         sp_banks[i].num_bytes;
 168                 bytes_avail += sp_banks[i].num_bytes;
 169                 if (cmdline_memory_size) {
 170                         if (bytes_avail > cmdline_memory_size) {
 171                                 unsigned long slack = bytes_avail - cmdline_memory_size;
 172
 173                                 bytes_avail -= slack;
 174                                 end_of_phys_memory -= slack;
 175
 176                                 sp_banks[i].num_bytes -= slack;
 177                                 if (sp_banks[i].num_bytes == 0) {
 178                                         sp_banks[i].base_addr = 0xdeadbeef;
 179                                 } else {
 180                                         sp_banks[i+1].num_bytes = 0;
 181                                         sp_banks[i+1].base_addr = 0xdeadbeef;
 182                                 }
 183                                 break;
 184                         }
 185                 }
 186         }
 187
 188         /* Start with page aligned address of last symbol in kernel
 189          * image.
 190          */
 191         start_pfn  = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
 192
 193         /* Now shift down to get the real physical page frame number. */
 194         start_pfn >>= PAGE_SHIFT;
 195
 196         bootmap_pfn = start_pfn;
 197
 198         max_pfn = end_of_phys_memory >> PAGE_SHIFT;
 199
 200         max_low_pfn = max_pfn;
 201         highstart_pfn = highend_pfn = max_pfn;
 202
 203         if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
 204                 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
 205                 max_low_pfn = calc_max_low_pfn();
 206                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 207                     calc_highpages() >> (20 - PAGE_SHIFT));
 208         }
 209
 210 #ifdef CONFIG_BLK_DEV_INITRD
 211         /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
 212         if (sparc_ramdisk_image) {
 213                 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
 214                         sparc_ramdisk_image -= KERNBASE;
 215                 initrd_start = sparc_ramdisk_image + phys_base;
 216                 initrd_end = initrd_start + sparc_ramdisk_size;
 217                 if (initrd_end > end_of_phys_memory) {
 218                         printk(KERN_CRIT "initrd extends beyond end of memory "
 219                                          "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
 220                                initrd_end, end_of_phys_memory);
 221                         initrd_start = 0;
 222                 }
 223                 if (initrd_start) {
 224                         if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
 225                             initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
 226                                 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
 227                 }
 228         }
 229 #endif
 230         /* Initialize the boot-time allocator. */
 231         bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
 232                                          max_low_pfn);
 233
 234         /* Now register the available physical memory with the
 235          * allocator.
 236          */
 237         *pages_avail = 0;
 238         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 239                 unsigned long curr_pfn, last_pfn;
 240
 241                 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 242                 if (curr_pfn >= max_low_pfn)
 243                         break;
 244
 245                 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 246                 if (last_pfn > max_low_pfn)
 247                         last_pfn = max_low_pfn;
 248
 249                 /*
 250                  * .. finally, did all the rounding and playing
 251                  * around just make the area go away?
 252                  */
 253                 if (last_pfn <= curr_pfn)
 254                         continue;
 255
 256                 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
 257                 *pages_avail += last_pfn - curr_pfn;
 258
 259                 free_bootmem(sp_banks[i].base_addr, size);
 260         }
 261
 262 #ifdef CONFIG_BLK_DEV_INITRD
 263         if (initrd_start) {
 264                 /* Reserve the initrd image area. */
 265                 size = initrd_end - initrd_start;
 266                 reserve_bootmem(initrd_start, size);
 267                 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 268
 269                 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
 270                 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
 271         }
 272 #endif
 273         /* Reserve the kernel text/data/bss. */
 274         size = (start_pfn << PAGE_SHIFT) - phys_base;
 275         reserve_bootmem(phys_base, size);
 276         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 277
 278         /* Reserve the bootmem map.   We do not account for it
 279          * in pages_avail because we will release that memory
 280          * in free_all_bootmem.
 281          */
 282         size = bootmap_size;
 283         reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
 284         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 285
 286         return max_pfn;
 287 }
 288
 289 /*
 290  * check_pgt_cache
 291  *
 292  * This is called at the end of unmapping of VMA (zap_page_range),
 293  * to rescan the page cache for architecture specific things,
 294  * presumably something like sun4/sun4c PMEGs. Most architectures
 295  * define check_pgt_cache empty.
 296  *
 297  * We simply copy the 2.4 implementation for now.
 298  */
 299 int pgt_cache_water[2] = { 25, 50 };
 300
 301 void check_pgt_cache(void)
 302 {
 303         do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
 304 }
 305
 306 /*
 307  * paging_init() sets up the page tables: We call the MMU specific
 308  * init routine based upon the Sun model type on the Sparc.
 309  *
 310  */
 311 extern void sun4c_paging_init(void);
 312 extern void srmmu_paging_init(void);
 313 extern void device_scan(void);
 314
 315 void __init paging_init(void)
 316 {
 317         switch(sparc_cpu_model) {
 318         case sun4c:
 319         case sun4e:
 320         case sun4:
 321                 sun4c_paging_init();
 322                 sparc_unmapped_base = 0xe0000000;
 323                 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
 324                 break;
 325         case sun4m:
 326         case sun4d:
 327                 srmmu_paging_init();
 328                 sparc_unmapped_base = 0x50000000;
 329                 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
 330                 break;
 331         default:
 332                 prom_printf("paging_init: Cannot init paging on this Sparc\n");
 333                 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
 334                 prom_printf("paging_init: Halting...\n");
 335                 prom_halt();
 336         };
 337
 338         /* Initialize the protection map with non-constant, MMU dependent values. */
 339         protection_map[0] = PAGE_NONE;
 340         protection_map[1] = PAGE_READONLY;
 341         protection_map[2] = PAGE_COPY;
 342         protection_map[3] = PAGE_COPY;
 343         protection_map[4] = PAGE_READONLY;
 344         protection_map[5] = PAGE_READONLY;
 345         protection_map[6] = PAGE_COPY;
 346         protection_map[7] = PAGE_COPY;
 347         protection_map[8] = PAGE_NONE;
 348         protection_map[9] = PAGE_READONLY;
 349         protection_map[10] = PAGE_SHARED;
 350         protection_map[11] = PAGE_SHARED;
 351         protection_map[12] = PAGE_READONLY;
 352         protection_map[13] = PAGE_READONLY;
 353         protection_map[14] = PAGE_SHARED;
 354         protection_map[15] = PAGE_SHARED;
 355         btfixup();
 356         device_scan();
 357 }
 358
 359 struct cache_palias *sparc_aliases;
 360
 361 static void __init taint_real_pages(void)
 362 {
 363         int i;
 364
 365         for (i = 0; sp_banks[i].num_bytes; i++) {
 366                 unsigned long start, end;
 367
 368                 start = sp_banks[i].base_addr;
 369                 end = start + sp_banks[i].num_bytes;
 370
 371                 while (start < end) {
 372                         set_bit(start >> 20, sparc_valid_addr_bitmap);
 373                         start += PAGE_SIZE;
 374                 }
 375         }
 376 }
 377
 378 void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
 379 {
 380         unsigned long tmp;
 381
 382 #ifdef CONFIG_DEBUG_HIGHMEM
 383         printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
 384 #endif
 385
 386         for (tmp = start_pfn; tmp < end_pfn; tmp++) {
 387                 struct page *page = pfn_to_page(tmp);
 388
 389                 ClearPageReserved(page);
 390                 set_bit(PG_highmem, &page->flags);
 391                 set_page_count(page, 1);
 392                 __free_page(page);
 393                 totalhigh_pages++;
 394         }
 395 }
 396
 397 void __init mem_init(void)
 398 {
 399         int codepages = 0;
 400         int datapages = 0;
 401         int initpages = 0;
 402         int reservedpages = 0;
 403         int i;
 404
 405         highmem_start_page = pfn_to_page(highstart_pfn);
 406
 407         if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
 408                 prom_printf("BUG: fixmap and pkmap areas overlap\n");
 409                 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
 410                        PKMAP_BASE,
 411                        (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 412                        FIXADDR_START);
 413                 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
 414                 prom_halt();
 415         }
 416
 417
 418         /* Saves us work later. */
 419         memset((void *)&empty_zero_page, 0, PAGE_SIZE);
 420
 421         i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
 422         i += 1;
 423         sparc_valid_addr_bitmap = (unsigned long *)
 424                 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
 425
 426         if (sparc_valid_addr_bitmap == NULL) {
 427                 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
 428                 prom_halt();
 429         }
 430         memset(sparc_valid_addr_bitmap, 0, i << 2);
 431
 432         taint_real_pages();
 433
 434         max_mapnr = last_valid_pfn - pfn_base;
 435         high_memory = __va(max_low_pfn << PAGE_SHIFT);
 436
 437         totalram_pages = free_all_bootmem();
 438
 439         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 440                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 441                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 442
 443                 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
 444
 445                 if (end_pfn <= highstart_pfn)
 446                         continue;
 447
 448                 if (start_pfn < highstart_pfn)
 449                         start_pfn = highstart_pfn;
 450
 451                 map_high_region(start_pfn, end_pfn);
 452         }
 453
 454         totalram_pages += totalhigh_pages;
 455
 456         codepages = (((unsigned long) &etext) - ((unsigned long)&_start));
 457         codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
 458         datapages = (((unsigned long) &edata) - ((unsigned long)&etext));
 459         datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
 460         initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
 461         initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
 462
 463         /* Ignore memory holes for the purpose of counting reserved pages */
 464         for (i=0; i < max_low_pfn; i++)
 465                 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
 466                     && PageReserved(pfn_to_page(i)))
 467                         reservedpages++;
 468
 469         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
 470                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 471                num_physpages << (PAGE_SHIFT - 10),
 472                codepages << (PAGE_SHIFT-10),
 473                reservedpages << (PAGE_SHIFT - 10),
 474                datapages << (PAGE_SHIFT-10),
 475                initpages << (PAGE_SHIFT-10),
 476                totalhigh_pages << (PAGE_SHIFT-10));
 477 }
 478
 479 void free_initmem (void)
 480 {
 481         unsigned long addr;
 482
 483         addr = (unsigned long)(&__init_begin);
 484         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 485                 struct page *p;
 486
 487                 p = virt_to_page(addr);
 488
 489                 ClearPageReserved(p);
 490                 set_page_count(p, 1);
 491                 __free_page(p);
 492                 totalram_pages++;
 493                 num_physpages++;
 494         }
 495         printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
 496 }
 497
 498 #ifdef CONFIG_BLK_DEV_INITRD
 499 void free_initrd_mem(unsigned long start, unsigned long end)
 500 {
 501         if (start < end)
 502                 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 503         for (; start < end; start += PAGE_SIZE) {
 504                 struct page *p = virt_to_page(start);
 505
 506                 ClearPageReserved(p);
 507                 set_page_count(p, 1);
 508                 __free_page(p);
 509                 num_physpages++;
 510         }
 511 }
 512 #endif
 513
 514 void sparc_flush_page_to_ram(struct page *page)
 515 {
 516         unsigned long vaddr = (unsigned long)page_address(page);
 517
 518         if (vaddr)
 519                 __flush_page_to_ram(vaddr);
 520 }