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
  49 struct pgtable_cache_struct pgt_quicklists;
  50
  51 /* Initial ramdisk setup */
  52 extern unsigned int sparc_ramdisk_image;
  53 extern unsigned int sparc_ramdisk_size;
  54
  55 unsigned long highstart_pfn, highend_pfn;
  56
  57 pte_t *kmap_pte;
  58 pgprot_t kmap_prot;
  59
  60 #define kmap_get_fixmap_pte(vaddr) \
  61         pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
  62
  63 void __init kmap_init(void)
  64 {
  65         /* cache the first kmap pte */
  66         kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
  67         kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
  68 }
  69
  70 void show_mem(unsigned int filter)
  71 {
  72         printk("Mem-info:\n");
  73         show_free_areas(filter);
  74         printk("Free swap:       %6ldkB\n",
  75                nr_swap_pages << (PAGE_SHIFT-10));
  76         printk("%ld pages of RAM\n", totalram_pages);
  77         printk("%ld free pages\n", nr_free_pages());
  78 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */
  79         printk("%ld pages in page table cache\n",pgtable_cache_size);
  80 #ifndef CONFIG_SMP
  81         if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
  82                 printk("%ld entries in page dir cache\n",pgd_cache_size);
  83 #endif
  84 #endif
  85 }
  86
  87 void __init sparc_context_init(int numctx)
  88 {
  89         int ctx;
  90
  91         ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
  92
  93         for(ctx = 0; ctx < numctx; ctx++) {
  94                 struct ctx_list *clist;
  95
  96                 clist = (ctx_list_pool + ctx);
  97                 clist->ctx_number = ctx;
  98                 clist->ctx_mm = NULL;
  99         }
 100         ctx_free.next = ctx_free.prev = &ctx_free;
 101         ctx_used.next = ctx_used.prev = &ctx_used;
 102         for(ctx = 0; ctx < numctx; ctx++)
 103                 add_to_free_ctxlist(ctx_list_pool + ctx);
 104 }
 105
 106 extern unsigned long cmdline_memory_size;
 107 unsigned long last_valid_pfn;
 108
 109 unsigned long calc_highpages(void)
 110 {
 111         int i;
 112         int nr = 0;
 113
 114         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 115                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 116                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 117
 118                 if (end_pfn <= max_low_pfn)
 119                         continue;
 120
 121                 if (start_pfn < max_low_pfn)
 122                         start_pfn = max_low_pfn;
 123
 124                 nr += end_pfn - start_pfn;
 125         }
 126
 127         return nr;
 128 }
 129
 130 static unsigned long calc_max_low_pfn(void)
 131 {
 132         int i;
 133         unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
 134         unsigned long curr_pfn, last_pfn;
 135
 136         last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
 137         for (i = 1; sp_banks[i].num_bytes != 0; i++) {
 138                 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 139
 140                 if (curr_pfn >= tmp) {
 141                         if (last_pfn < tmp)
 142                                 tmp = last_pfn;
 143                         break;
 144                 }
 145
 146                 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 147         }
 148
 149         return tmp;
 150 }
 151
 152 unsigned long __init bootmem_init(unsigned long *pages_avail)
 153 {
 154         unsigned long bootmap_size, start_pfn;
 155         unsigned long end_of_phys_memory = 0UL;
 156         unsigned long bootmap_pfn, bytes_avail, size;
 157         int i;
 158
 159         bytes_avail = 0UL;
 160         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 161                 end_of_phys_memory = sp_banks[i].base_addr +
 162                         sp_banks[i].num_bytes;
 163                 bytes_avail += sp_banks[i].num_bytes;
 164                 if (cmdline_memory_size) {
 165                         if (bytes_avail > cmdline_memory_size) {
 166                                 unsigned long slack = bytes_avail - cmdline_memory_size;
 167
 168                                 bytes_avail -= slack;
 169                                 end_of_phys_memory -= slack;
 170
 171                                 sp_banks[i].num_bytes -= slack;
 172                                 if (sp_banks[i].num_bytes == 0) {
 173                                         sp_banks[i].base_addr = 0xdeadbeef;
 174                                 } else {
 175                                         sp_banks[i+1].num_bytes = 0;
 176                                         sp_banks[i+1].base_addr = 0xdeadbeef;
 177                                 }
 178                                 break;
 179                         }
 180                 }
 181         }
 182
 183         /* Start with page aligned address of last symbol in kernel
 184          * image.
 185          */
 186         start_pfn  = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
 187
 188         /* Now shift down to get the real physical page frame number. */
 189         start_pfn >>= PAGE_SHIFT;
 190
 191         bootmap_pfn = start_pfn;
 192
 193         max_pfn = end_of_phys_memory >> PAGE_SHIFT;
 194
 195         max_low_pfn = max_pfn;
 196         highstart_pfn = highend_pfn = max_pfn;
 197
 198         if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
 199                 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
 200                 max_low_pfn = calc_max_low_pfn();
 201                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 202                     calc_highpages() >> (20 - PAGE_SHIFT));
 203         }
 204
 205 #ifdef CONFIG_BLK_DEV_INITRD
 206         /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
 207         if (sparc_ramdisk_image) {
 208                 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
 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, BOOTMEM_DEFAULT);
 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, BOOTMEM_DEFAULT);
 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, BOOTMEM_DEFAULT);
 279         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
 280
 281         return max_pfn;
 282 }
 283
 284 /*
 285  * paging_init() sets up the page tables: We call the MMU specific
 286  * init routine based upon the Sun model type on the Sparc.
 287  *
 288  */
 289 extern void srmmu_paging_init(void);
 290 extern void device_scan(void);
 291
 292 void __init paging_init(void)
 293 {
 294         srmmu_paging_init();
 295         prom_build_devicetree();
 296         of_fill_in_cpu_data();
 297         device_scan();
 298 }
 299
 300 static void __init taint_real_pages(void)
 301 {
 302         int i;
 303
 304         for (i = 0; sp_banks[i].num_bytes; i++) {
 305                 unsigned long start, end;
 306
 307                 start = sp_banks[i].base_addr;
 308                 end = start + sp_banks[i].num_bytes;
 309
 310                 while (start < end) {
 311                         set_bit(start >> 20, sparc_valid_addr_bitmap);
 312                         start += PAGE_SIZE;
 313                 }
 314         }
 315 }
 316
 317 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
 318 {
 319         unsigned long tmp;
 320
 321 #ifdef CONFIG_DEBUG_HIGHMEM
 322         printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
 323 #endif
 324
 325         for (tmp = start_pfn; tmp < end_pfn; tmp++) {
 326                 struct page *page = pfn_to_page(tmp);
 327
 328                 ClearPageReserved(page);
 329                 init_page_count(page);
 330                 __free_page(page);
 331                 totalhigh_pages++;
 332         }
 333 }
 334
 335 void __init mem_init(void)
 336 {
 337         int codepages = 0;
 338         int datapages = 0;
 339         int initpages = 0;
 340         int reservedpages = 0;
 341         int i;
 342
 343         if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
 344                 prom_printf("BUG: fixmap and pkmap areas overlap\n");
 345                 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
 346                        PKMAP_BASE,
 347                        (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 348                        FIXADDR_START);
 349                 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
 350                 prom_halt();
 351         }
 352
 353
 354         /* Saves us work later. */
 355         memset((void *)&empty_zero_page, 0, PAGE_SIZE);
 356
 357         i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
 358         i += 1;
 359         sparc_valid_addr_bitmap = (unsigned long *)
 360                 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
 361
 362         if (sparc_valid_addr_bitmap == NULL) {
 363                 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
 364                 prom_halt();
 365         }
 366         memset(sparc_valid_addr_bitmap, 0, i << 2);
 367
 368         taint_real_pages();
 369
 370         max_mapnr = last_valid_pfn - pfn_base;
 371         high_memory = __va(max_low_pfn << PAGE_SHIFT);
 372
 373         totalram_pages = free_all_bootmem();
 374
 375         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 376                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
 377                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
 378
 379                 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
 380
 381                 if (end_pfn <= highstart_pfn)
 382                         continue;
 383
 384                 if (start_pfn < highstart_pfn)
 385                         start_pfn = highstart_pfn;
 386
 387                 map_high_region(start_pfn, end_pfn);
 388         }
 389
 390         totalram_pages += totalhigh_pages;
 391
 392         codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
 393         codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
 394         datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
 395         datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
 396         initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
 397         initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
 398
 399         /* Ignore memory holes for the purpose of counting reserved pages */
 400         for (i=0; i < max_low_pfn; i++)
 401                 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
 402                     && PageReserved(pfn_to_page(i)))
 403                         reservedpages++;
 404
 405         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
 406                nr_free_pages() << (PAGE_SHIFT-10),
 407                num_physpages << (PAGE_SHIFT - 10),
 408                codepages << (PAGE_SHIFT-10),
 409                reservedpages << (PAGE_SHIFT - 10),
 410                datapages << (PAGE_SHIFT-10),
 411                initpages << (PAGE_SHIFT-10),
 412                totalhigh_pages << (PAGE_SHIFT-10));
 413 }
 414
 415 void free_initmem (void)
 416 {
 417         unsigned long addr;
 418         unsigned long freed;
 419
 420         addr = (unsigned long)(&__init_begin);
 421         freed = (unsigned long)(&__init_end) - addr;
 422         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 423                 struct page *p;
 424
 425                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
 426                 p = virt_to_page(addr);
 427
 428                 ClearPageReserved(p);
 429                 init_page_count(p);
 430                 __free_page(p);
 431                 totalram_pages++;
 432                 num_physpages++;
 433         }
 434         printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
 435                 freed >> 10);
 436 }
 437
 438 #ifdef CONFIG_BLK_DEV_INITRD
 439 void free_initrd_mem(unsigned long start, unsigned long end)
 440 {
 441         if (start < end)
 442                 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
 443                         (end - start) >> 10);
 444         for (; start < end; start += PAGE_SIZE) {
 445                 struct page *p;
 446
 447                 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
 448                 p = virt_to_page(start);
 449
 450                 ClearPageReserved(p);
 451                 init_page_count(p);
 452                 __free_page(p);
 453                 totalram_pages++;
 454                 num_physpages++;
 455         }
 456 }
 457 #endif
 458
 459 void sparc_flush_page_to_ram(struct page *page)
 460 {
 461         unsigned long vaddr = (unsigned long)page_address(page);
 462
 463         if (vaddr)
 464                 __flush_page_to_ram(vaddr);
 465 }
 466 EXPORT_SYMBOL(sparc_flush_page_to_ram);