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