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