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/system.h> 31#include <asm/vac-ops.h> 32#include <asm/page.h> 33#include <asm/pgtable.h> 34#include <asm/vaddrs.h> 35#include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */ 36#include <asm/tlb.h> 37#include <asm/prom.h> 38#include <asm/leon.h> 39 40DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 41 42unsigned long *sparc_valid_addr_bitmap; 43EXPORT_SYMBOL(sparc_valid_addr_bitmap); 44 45unsigned long phys_base; 46EXPORT_SYMBOL(phys_base); 47 48unsigned long pfn_base; 49EXPORT_SYMBOL(pfn_base); 50 51unsigned long page_kernel; 52EXPORT_SYMBOL(page_kernel); 53 54struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; 55unsigned long sparc_unmapped_base; 56 57struct pgtable_cache_struct pgt_quicklists; 58 59/* Initial ramdisk setup */ 60extern unsigned int sparc_ramdisk_image; 61extern unsigned int sparc_ramdisk_size; 62 63unsigned long highstart_pfn, highend_pfn; 64 65pte_t *kmap_pte; 66pgprot_t kmap_prot; 67 68#define kmap_get_fixmap_pte(vaddr) \ 69 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)) 70 71void __init kmap_init(void) 72{ 73 /* cache the first kmap pte */ 74 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN)); 75 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE); 76} 77 78void show_mem(void) 79{ 80 printk("Mem-info:\n"); 81 show_free_areas(); 82 printk("Free swap: %6ldkB\n", 83 nr_swap_pages << (PAGE_SHIFT-10)); 84 printk("%ld pages of RAM\n", totalram_pages); 85 printk("%ld free pages\n", nr_free_pages()); 86} 87 88void __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 107extern unsigned long cmdline_memory_size; 108unsigned long last_valid_pfn; 109 110unsigned 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 131static 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 153unsigned 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 * check_pgt_cache 287 * 288 * This is called at the end of unmapping of VMA (zap_page_range), 289 * to rescan the page cache for architecture specific things, 290 * presumably something like sun4/sun4c PMEGs. Most architectures 291 * define check_pgt_cache empty. 292 * 293 * We simply copy the 2.4 implementation for now. 294 */ 295static int pgt_cache_water[2] = { 25, 50 }; 296 297void check_pgt_cache(void) 298{ 299 do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]); 300} 301 302/* 303 * paging_init() sets up the page tables: We call the MMU specific 304 * init routine based upon the Sun model type on the Sparc. 305 * 306 */ 307extern void sun4c_paging_init(void); 308extern void srmmu_paging_init(void); 309extern void device_scan(void); 310 311pgprot_t PAGE_SHARED __read_mostly; 312EXPORT_SYMBOL(PAGE_SHARED); 313 314void __init paging_init(void) 315{ 316 switch(sparc_cpu_model) { 317 case sun4c: 318 case sun4e: 319 case sun4: 320 sun4c_paging_init(); 321 sparc_unmapped_base = 0xe0000000; 322 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000); 323 break; 324 case sparc_leon: 325 leon_init(); 326 /* fall through */ 327 case sun4m: 328 case sun4d: 329 srmmu_paging_init(); 330 sparc_unmapped_base = 0x50000000; 331 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000); 332 break; 333 default: 334 prom_printf("paging_init: Cannot init paging on this Sparc\n"); 335 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model); 336 prom_printf("paging_init: Halting...\n"); 337 prom_halt(); 338 }; 339 340 /* Initialize the protection map with non-constant, MMU dependent values. */ 341 protection_map[0] = PAGE_NONE; 342 protection_map[1] = PAGE_READONLY; 343 protection_map[2] = PAGE_COPY; 344 protection_map[3] = PAGE_COPY; 345 protection_map[4] = PAGE_READONLY; 346 protection_map[5] = PAGE_READONLY; 347 protection_map[6] = PAGE_COPY; 348 protection_map[7] = PAGE_COPY; 349 protection_map[8] = PAGE_NONE; 350 protection_map[9] = PAGE_READONLY; 351 protection_map[10] = PAGE_SHARED; 352 protection_map[11] = PAGE_SHARED; 353 protection_map[12] = PAGE_READONLY; 354 protection_map[13] = PAGE_READONLY; 355 protection_map[14] = PAGE_SHARED; 356 protection_map[15] = PAGE_SHARED; 357 btfixup(); 358 prom_build_devicetree(); 359 of_fill_in_cpu_data(); 360 device_scan(); 361} 362 363static void __init taint_real_pages(void) 364{ 365 int i; 366 367 for (i = 0; sp_banks[i].num_bytes; i++) { 368 unsigned long start, end; 369 370 start = sp_banks[i].base_addr; 371 end = start + sp_banks[i].num_bytes; 372 373 while (start < end) { 374 set_bit(start >> 20, sparc_valid_addr_bitmap); 375 start += PAGE_SIZE; 376 } 377 } 378} 379 380static void map_high_region(unsigned long start_pfn, unsigned long end_pfn) 381{ 382 unsigned long tmp; 383 384#ifdef CONFIG_DEBUG_HIGHMEM 385 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn); 386#endif 387 388 for (tmp = start_pfn; tmp < end_pfn; tmp++) { 389 struct page *page = pfn_to_page(tmp); 390 391 ClearPageReserved(page); 392 init_page_count(page); 393 __free_page(page); 394 totalhigh_pages++; 395 } 396} 397 398void __init mem_init(void) 399{ 400 int codepages = 0; 401 int datapages = 0; 402 int initpages = 0; 403 int reservedpages = 0; 404 int i; 405 406 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { 407 prom_printf("BUG: fixmap and pkmap areas overlap\n"); 408 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n", 409 PKMAP_BASE, 410 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 411 FIXADDR_START); 412 prom_printf("Please mail sparclinux@vger.kernel.org.\n"); 413 prom_halt(); 414 } 415 416 417 /* Saves us work later. */ 418 memset((void *)&empty_zero_page, 0, PAGE_SIZE); 419 420 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); 421 i += 1; 422 sparc_valid_addr_bitmap = (unsigned long *) 423 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL); 424 425 if (sparc_valid_addr_bitmap == NULL) { 426 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); 427 prom_halt(); 428 } 429 memset(sparc_valid_addr_bitmap, 0, i << 2); 430 431 taint_real_pages(); 432 433 max_mapnr = last_valid_pfn - pfn_base; 434 high_memory = __va(max_low_pfn << PAGE_SHIFT); 435 436 totalram_pages = free_all_bootmem(); 437 438 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 439 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 440 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 441 442 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT; 443 444 if (end_pfn <= highstart_pfn) 445 continue; 446 447 if (start_pfn < highstart_pfn) 448 start_pfn = highstart_pfn; 449 450 map_high_region(start_pfn, end_pfn); 451 } 452 453 totalram_pages += totalhigh_pages; 454 455 codepages = (((unsigned long) &_etext) - ((unsigned long)&_start)); 456 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT; 457 datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext)); 458 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT; 459 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin)); 460 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT; 461 462 /* Ignore memory holes for the purpose of counting reserved pages */ 463 for (i=0; i < max_low_pfn; i++) 464 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap) 465 && PageReserved(pfn_to_page(i))) 466 reservedpages++; 467 468 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n", 469 nr_free_pages() << (PAGE_SHIFT-10), 470 num_physpages << (PAGE_SHIFT - 10), 471 codepages << (PAGE_SHIFT-10), 472 reservedpages << (PAGE_SHIFT - 10), 473 datapages << (PAGE_SHIFT-10), 474 initpages << (PAGE_SHIFT-10), 475 totalhigh_pages << (PAGE_SHIFT-10)); 476} 477 478void free_initmem (void) 479{ 480 unsigned long addr; 481 unsigned long freed; 482 483 addr = (unsigned long)(&__init_begin); 484 freed = (unsigned long)(&__init_end) - addr; 485 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 486 struct page *p; 487 488 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); 489 p = virt_to_page(addr); 490 491 ClearPageReserved(p); 492 init_page_count(p); 493 __free_page(p); 494 totalram_pages++; 495 num_physpages++; 496 } 497 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n", 498 freed >> 10); 499} 500 501#ifdef CONFIG_BLK_DEV_INITRD 502void free_initrd_mem(unsigned long start, unsigned long end) 503{ 504 if (start < end) 505 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", 506 (end - start) >> 10); 507 for (; start < end; start += PAGE_SIZE) { 508 struct page *p; 509 510 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE); 511 p = virt_to_page(start); 512 513 ClearPageReserved(p); 514 init_page_count(p); 515 __free_page(p); 516 totalram_pages++; 517 num_physpages++; 518 } 519} 520#endif 521 522void sparc_flush_page_to_ram(struct page *page) 523{ 524 unsigned long vaddr = (unsigned long)page_address(page); 525 526 if (vaddr) 527 __flush_page_to_ram(vaddr); 528} 529EXPORT_SYMBOL(sparc_flush_page_to_ram); 530