Pileus Git - ~andy/linux/blob - 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/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 #include <asm/prom.h>
  36 #include <asm/leon.h>
  37
  38 unsigned long *sparc_valid_addr_bitmap;
  39 EXPORT_SYMBOL(sparc_valid_addr_bitmap);
  40
  41 unsigned long phys_base;
  42 EXPORT_SYMBOL(phys_base);
  43
  44 unsigned long pfn_base;
  45 EXPORT_SYMBOL(pfn_base);
  46
  47 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  48 unsigned long sparc_unmapped_base;
  49
  50 struct pgtable_cache_struct pgt_quicklists;
  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(unsigned int filter)
  72 {
  73         printk("Mem-info:\n");
  74         show_free_areas(filter);
  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 static 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                 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
 210                         sparc_ramdisk_image -= KERNBASE;
 211                 initrd_start = sparc_ramdisk_image + phys_base;
 212                 initrd_end = initrd_start + sparc_ramdisk_size;
 213                 if (initrd_end > end_of_phys_memory) {
 214                         printk(KERN_CRIT "initrd extends beyond end of memory "
 215                                          "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
 216                                initrd_end, end_of_phys_memory);
 217                         initrd_start = 0;
 218                 }
 219                 if (initrd_start) {
 220                         if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
 221                             initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
 222                                 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
 223                 }
 224         }
 225 #endif
 226         /* Initialize the boot-time allocator. */
 227         bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
 228                                          max_low_pfn);
 229
 230         /* Now register the available physical memory with the
 231          * allocator.
 232          */
 233         *pages_avail = 0;
 234         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 235                 unsigned long curr_pfn, last_pfn;
 236
 237                 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 238                 if (curr_pfn >= max_low_pfn)
 239                         break;
 240
 241                 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 242                 if (last_pfn > max_low_pfn)
 243                         last_pfn = max_low_pfn;
 244
 245                 /*
 246                  * .. finally, did all the rounding and playing
 247                  * around just make the area go away?
 248                  */
 249                 if (last_pfn <= curr_pfn)
 250                         continue;
 251
 252                 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
 253                 *pages_avail += last_pfn - curr_pfn;
 254
 255                 free_bootmem(sp_banks[i].base_addr, size);
 256         }
 257
 258 #ifdef CONFIG_BLK_DEV_INITRD
 259         if (initrd_start) {
 260                 /* Reserve the initrd image area. */
 261                 size = initrd_end - initrd_start;
 262                 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
 263                 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 264
 265                 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
 266                 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
 267         }
 268 #endif
 269         /* Reserve the kernel text/data/bss. */
 270         size = (start_pfn << PAGE_SHIFT) - phys_base;
 271         reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
 272         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 273
 274         /* Reserve the bootmem map.   We do not account for it
 275          * in pages_avail because we will release that memory
 276          * in free_all_bootmem.
 277          */
 278         size = bootmap_size;
 279         reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
 280         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 281
 282         return max_pfn;
 283 }
 284
 285 /*
 286  * paging_init() sets up the page tables: We call the MMU specific
 287  * init routine based upon the Sun model type on the Sparc.
 288  *
 289  */
 290 extern void srmmu_paging_init(void);
 291 extern void device_scan(void);
 292
 293 void __init paging_init(void)
 294 {
 295         switch(sparc_cpu_model) {
 296         case sparc_leon:
 297                 leon_init();
 298                 /* fall through */
 299         case sun4m:
 300         case sun4d:
 301                 srmmu_paging_init();
 302                 sparc_unmapped_base = 0x50000000;
 303                 break;
 304         default:
 305                 prom_printf("paging_init: Cannot init paging on this Sparc\n");
 306                 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
 307                 prom_printf("paging_init: Halting...\n");
 308                 prom_halt();
 309         }
 310
 311         prom_build_devicetree();
 312         of_fill_in_cpu_data();
 313         device_scan();
 314 }
 315
 316 static void __init taint_real_pages(void)
 317 {
 318         int i;
 319
 320         for (i = 0; sp_banks[i].num_bytes; i++) {
 321                 unsigned long start, end;
 322
 323                 start = sp_banks[i].base_addr;
 324                 end = start + sp_banks[i].num_bytes;
 325
 326                 while (start < end) {
 327                         set_bit(start >> 20, sparc_valid_addr_bitmap);
 328                         start += PAGE_SIZE;
 329                 }
 330         }
 331 }
 332
 333 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
 334 {
 335         unsigned long tmp;
 336
 337 #ifdef CONFIG_DEBUG_HIGHMEM
 338         printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
 339 #endif
 340
 341         for (tmp = start_pfn; tmp < end_pfn; tmp++) {
 342                 struct page *page = pfn_to_page(tmp);
 343
 344                 ClearPageReserved(page);
 345                 init_page_count(page);
 346                 __free_page(page);
 347                 totalhigh_pages++;
 348         }
 349 }
 350
 351 void __init mem_init(void)
 352 {
 353         int codepages = 0;
 354         int datapages = 0;
 355         int initpages = 0;
 356         int reservedpages = 0;
 357         int i;
 358
 359         if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
 360                 prom_printf("BUG: fixmap and pkmap areas overlap\n");
 361                 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
 362                        PKMAP_BASE,
 363                        (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 364                        FIXADDR_START);
 365                 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
 366                 prom_halt();
 367         }
 368
 369
 370         /* Saves us work later. */
 371         memset((void *)&empty_zero_page, 0, PAGE_SIZE);
 372
 373         i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
 374         i += 1;
 375         sparc_valid_addr_bitmap = (unsigned long *)
 376                 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
 377
 378         if (sparc_valid_addr_bitmap == NULL) {
 379                 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
 380                 prom_halt();
 381         }
 382         memset(sparc_valid_addr_bitmap, 0, i << 2);
 383
 384         taint_real_pages();
 385
 386         max_mapnr = last_valid_pfn - pfn_base;
 387         high_memory = __va(max_low_pfn << PAGE_SHIFT);
 388
 389         totalram_pages = free_all_bootmem();
 390
 391         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 392                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 393                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 394
 395                 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
 396
 397                 if (end_pfn <= highstart_pfn)
 398                         continue;
 399
 400                 if (start_pfn < highstart_pfn)
 401                         start_pfn = highstart_pfn;
 402
 403                 map_high_region(start_pfn, end_pfn);
 404         }
 405
 406         totalram_pages += totalhigh_pages;
 407
 408         codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
 409         codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
 410         datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
 411         datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
 412         initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
 413         initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
 414
 415         /* Ignore memory holes for the purpose of counting reserved pages */
 416         for (i=0; i < max_low_pfn; i++)
 417                 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
 418                     && PageReserved(pfn_to_page(i)))
 419                         reservedpages++;
 420
 421         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
 422                nr_free_pages() << (PAGE_SHIFT-10),
 423                num_physpages << (PAGE_SHIFT - 10),
 424                codepages << (PAGE_SHIFT-10),
 425                reservedpages << (PAGE_SHIFT - 10),
 426                datapages << (PAGE_SHIFT-10),
 427                initpages << (PAGE_SHIFT-10),
 428                totalhigh_pages << (PAGE_SHIFT-10));
 429 }
 430
 431 void free_initmem (void)
 432 {
 433         unsigned long addr;
 434         unsigned long freed;
 435
 436         addr = (unsigned long)(&__init_begin);
 437         freed = (unsigned long)(&__init_end) - addr;
 438         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 439                 struct page *p;
 440
 441                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
 442                 p = virt_to_page(addr);
 443
 444                 ClearPageReserved(p);
 445                 init_page_count(p);
 446                 __free_page(p);
 447                 totalram_pages++;
 448                 num_physpages++;
 449         }
 450         printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
 451                 freed >> 10);
 452 }
 453
 454 #ifdef CONFIG_BLK_DEV_INITRD
 455 void free_initrd_mem(unsigned long start, unsigned long end)
 456 {
 457         if (start < end)
 458                 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
 459                         (end - start) >> 10);
 460         for (; start < end; start += PAGE_SIZE) {
 461                 struct page *p;
 462
 463                 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
 464                 p = virt_to_page(start);
 465
 466                 ClearPageReserved(p);
 467                 init_page_count(p);
 468                 __free_page(p);
 469                 totalram_pages++;
 470                 num_physpages++;
 471         }
 472 }
 473 #endif
 474
 475 void sparc_flush_page_to_ram(struct page *page)
 476 {
 477         unsigned long vaddr = (unsigned long)page_address(page);
 478
 479         if (vaddr)
 480                 __flush_page_to_ram(vaddr);
 481 }
 482 EXPORT_SYMBOL(sparc_flush_page_to_ram);