1/* $Id: init.c,v 1.1.1.1 2007/08/03 18:52:18 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 35DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 36 37unsigned long *sparc_valid_addr_bitmap; 38 39unsigned long phys_base; 40unsigned long pfn_base; 41 42unsigned long page_kernel; 43 44struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; 45unsigned long sparc_unmapped_base; 46 47struct pgtable_cache_struct pgt_quicklists; 48 49/* References to section boundaries */ 50extern char __init_begin, __init_end, _start, _end, etext , edata; 51 52/* Initial ramdisk setup */ 53extern unsigned int sparc_ramdisk_image; 54extern unsigned int sparc_ramdisk_size; 55 56unsigned long highstart_pfn, highend_pfn; 57 58pte_t *kmap_pte; 59pgprot_t kmap_prot; 60 61#define kmap_get_fixmap_pte(vaddr) \ 62 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)) 63 64void __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 71void 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} 80 81void __init sparc_context_init(int numctx) 82{ 83 int ctx; 84 85 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL); 86 87 for(ctx = 0; ctx < numctx; ctx++) { 88 struct ctx_list *clist; 89 90 clist = (ctx_list_pool + ctx); 91 clist->ctx_number = ctx; 92 clist->ctx_mm = NULL; 93 } 94 ctx_free.next = ctx_free.prev = &ctx_free; 95 ctx_used.next = ctx_used.prev = &ctx_used; 96 for(ctx = 0; ctx < numctx; ctx++) 97 add_to_free_ctxlist(ctx_list_pool + ctx); 98} 99 100extern unsigned long cmdline_memory_size; 101unsigned long last_valid_pfn; 102 103unsigned long calc_highpages(void) 104{ 105 int i; 106 int nr = 0; 107 108 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 109 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 110 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 111 112 if (end_pfn <= max_low_pfn) 113 continue; 114 115 if (start_pfn < max_low_pfn) 116 start_pfn = max_low_pfn; 117 118 nr += end_pfn - start_pfn; 119 } 120 121 return nr; 122} 123 124unsigned long calc_max_low_pfn(void) 125{ 126 int i; 127 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 128 unsigned long curr_pfn, last_pfn; 129 130 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT; 131 for (i = 1; sp_banks[i].num_bytes != 0; i++) { 132 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 133 134 if (curr_pfn >= tmp) { 135 if (last_pfn < tmp) 136 tmp = last_pfn; 137 break; 138 } 139 140 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 141 } 142 143 return tmp; 144} 145 146unsigned long __init bootmem_init(unsigned long *pages_avail) 147{ 148 unsigned long bootmap_size, start_pfn; 149 unsigned long end_of_phys_memory = 0UL; 150 unsigned long bootmap_pfn, bytes_avail, size; 151 int i; 152 153 bytes_avail = 0UL; 154 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 155 end_of_phys_memory = sp_banks[i].base_addr + 156 sp_banks[i].num_bytes; 157 bytes_avail += sp_banks[i].num_bytes; 158 if (cmdline_memory_size) { 159 if (bytes_avail > cmdline_memory_size) { 160 unsigned long slack = bytes_avail - cmdline_memory_size; 161 162 bytes_avail -= slack; 163 end_of_phys_memory -= slack; 164 165 sp_banks[i].num_bytes -= slack; 166 if (sp_banks[i].num_bytes == 0) { 167 sp_banks[i].base_addr = 0xdeadbeef; 168 } else { 169 sp_banks[i+1].num_bytes = 0; 170 sp_banks[i+1].base_addr = 0xdeadbeef; 171 } 172 break; 173 } 174 } 175 } 176 177 /* Start with page aligned address of last symbol in kernel 178 * image. 179 */ 180 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end)); 181 182 /* Now shift down to get the real physical page frame number. */ 183 start_pfn >>= PAGE_SHIFT; 184 185 bootmap_pfn = start_pfn; 186 187 max_pfn = end_of_phys_memory >> PAGE_SHIFT; 188 189 max_low_pfn = max_pfn; 190 highstart_pfn = highend_pfn = max_pfn; 191 192 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) { 193 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 194 max_low_pfn = calc_max_low_pfn(); 195 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 196 calc_highpages() >> (20 - PAGE_SHIFT)); 197 } 198 199#ifdef CONFIG_BLK_DEV_INITRD 200 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */ 201 if (sparc_ramdisk_image) { 202 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE) 203 sparc_ramdisk_image -= KERNBASE; 204 initrd_start = sparc_ramdisk_image + phys_base; 205 initrd_end = initrd_start + sparc_ramdisk_size; 206 if (initrd_end > end_of_phys_memory) { 207 printk(KERN_CRIT "initrd extends beyond end of memory " 208 "(0x%016lx > 0x%016lx)\ndisabling initrd\n", 209 initrd_end, end_of_phys_memory); 210 initrd_start = 0; 211 } 212 if (initrd_start) { 213 if (initrd_start >= (start_pfn << PAGE_SHIFT) && 214 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE) 215 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT; 216 } 217 } 218#endif 219 /* Initialize the boot-time allocator. */ 220 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, 221 max_low_pfn); 222 223 /* Now register the available physical memory with the 224 * allocator. 225 */ 226 *pages_avail = 0; 227 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 228 unsigned long curr_pfn, last_pfn; 229 230 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 231 if (curr_pfn >= max_low_pfn) 232 break; 233 234 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 235 if (last_pfn > max_low_pfn) 236 last_pfn = max_low_pfn; 237 238 /* 239 * .. finally, did all the rounding and playing 240 * around just make the area go away? 241 */ 242 if (last_pfn <= curr_pfn) 243 continue; 244 245 size = (last_pfn - curr_pfn) << PAGE_SHIFT; 246 *pages_avail += last_pfn - curr_pfn; 247 248 free_bootmem(sp_banks[i].base_addr, size); 249 } 250 251#ifdef CONFIG_BLK_DEV_INITRD 252 if (initrd_start) { 253 /* Reserve the initrd image area. */ 254 size = initrd_end - initrd_start; 255 reserve_bootmem(initrd_start, size); 256 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 257 258 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET; 259 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET; 260 } 261#endif 262 /* Reserve the kernel text/data/bss. */ 263 size = (start_pfn << PAGE_SHIFT) - phys_base; 264 reserve_bootmem(phys_base, size); 265 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 266 267 /* Reserve the bootmem map. We do not account for it 268 * in pages_avail because we will release that memory 269 * in free_all_bootmem. 270 */ 271 size = bootmap_size; 272 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size); 273 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 274 275 return max_pfn; 276} 277 278/* 279 * check_pgt_cache 280 * 281 * This is called at the end of unmapping of VMA (zap_page_range), 282 * to rescan the page cache for architecture specific things, 283 * presumably something like sun4/sun4c PMEGs. Most architectures 284 * define check_pgt_cache empty. 285 * 286 * We simply copy the 2.4 implementation for now. 287 */ 288int pgt_cache_water[2] = { 25, 50 }; 289 290void check_pgt_cache(void) 291{ 292 do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]); 293} 294 295/* 296 * paging_init() sets up the page tables: We call the MMU specific 297 * init routine based upon the Sun model type on the Sparc. 298 * 299 */ 300extern void sun4c_paging_init(void); 301extern void srmmu_paging_init(void); 302extern void device_scan(void); 303 304void __init paging_init(void) 305{ 306 switch(sparc_cpu_model) { 307 case sun4c: 308 case sun4e: 309 case sun4: 310 sun4c_paging_init(); 311 sparc_unmapped_base = 0xe0000000; 312 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000); 313 break; 314 case sun4m: 315 case sun4d: 316 srmmu_paging_init(); 317 sparc_unmapped_base = 0x50000000; 318 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000); 319 break; 320 default: 321 prom_printf("paging_init: Cannot init paging on this Sparc\n"); 322 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model); 323 prom_printf("paging_init: Halting...\n"); 324 prom_halt(); 325 }; 326 327 /* Initialize the protection map with non-constant, MMU dependent values. */ 328 protection_map[0] = PAGE_NONE; 329 protection_map[1] = PAGE_READONLY; 330 protection_map[2] = PAGE_COPY; 331 protection_map[3] = PAGE_COPY; 332 protection_map[4] = PAGE_READONLY; 333 protection_map[5] = PAGE_READONLY; 334 protection_map[6] = PAGE_COPY; 335 protection_map[7] = PAGE_COPY; 336 protection_map[8] = PAGE_NONE; 337 protection_map[9] = PAGE_READONLY; 338 protection_map[10] = PAGE_SHARED; 339 protection_map[11] = PAGE_SHARED; 340 protection_map[12] = PAGE_READONLY; 341 protection_map[13] = PAGE_READONLY; 342 protection_map[14] = PAGE_SHARED; 343 protection_map[15] = PAGE_SHARED; 344 btfixup(); 345 prom_build_devicetree(); 346 device_scan(); 347} 348 349struct cache_palias *sparc_aliases; 350 351static void __init taint_real_pages(void) 352{ 353 int i; 354 355 for (i = 0; sp_banks[i].num_bytes; i++) { 356 unsigned long start, end; 357 358 start = sp_banks[i].base_addr; 359 end = start + sp_banks[i].num_bytes; 360 361 while (start < end) { 362 set_bit(start >> 20, sparc_valid_addr_bitmap); 363 start += PAGE_SIZE; 364 } 365 } 366} 367 368void map_high_region(unsigned long start_pfn, unsigned long end_pfn) 369{ 370 unsigned long tmp; 371 372#ifdef CONFIG_DEBUG_HIGHMEM 373 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn); 374#endif 375 376 for (tmp = start_pfn; tmp < end_pfn; tmp++) { 377 struct page *page = pfn_to_page(tmp); 378 379 ClearPageReserved(page); 380 init_page_count(page); 381 __free_page(page); 382 totalhigh_pages++; 383 } 384} 385 386void __init mem_init(void) 387{ 388 int codepages = 0; 389 int datapages = 0; 390 int initpages = 0; 391 int reservedpages = 0; 392 int i; 393 394 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { 395 prom_printf("BUG: fixmap and pkmap areas overlap\n"); 396 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n", 397 PKMAP_BASE, 398 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 399 FIXADDR_START); 400 prom_printf("Please mail sparclinux@vger.kernel.org.\n"); 401 prom_halt(); 402 } 403 404 405 /* Saves us work later. */ 406 memset((void *)&empty_zero_page, 0, PAGE_SIZE); 407 408 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); 409 i += 1; 410 sparc_valid_addr_bitmap = (unsigned long *) 411 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL); 412 413 if (sparc_valid_addr_bitmap == NULL) { 414 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); 415 prom_halt(); 416 } 417 memset(sparc_valid_addr_bitmap, 0, i << 2); 418 419 taint_real_pages(); 420 421 max_mapnr = last_valid_pfn - pfn_base; 422 high_memory = __va(max_low_pfn << PAGE_SHIFT); 423 424 totalram_pages = free_all_bootmem(); 425 426 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 427 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 428 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 429 430 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT; 431 432 if (end_pfn <= highstart_pfn) 433 continue; 434 435 if (start_pfn < highstart_pfn) 436 start_pfn = highstart_pfn; 437 438 map_high_region(start_pfn, end_pfn); 439 } 440 441 totalram_pages += totalhigh_pages; 442 443 codepages = (((unsigned long) &etext) - ((unsigned long)&_start)); 444 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT; 445 datapages = (((unsigned long) &edata) - ((unsigned long)&etext)); 446 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT; 447 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin)); 448 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT; 449 450 /* Ignore memory holes for the purpose of counting reserved pages */ 451 for (i=0; i < max_low_pfn; i++) 452 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap) 453 && PageReserved(pfn_to_page(i))) 454 reservedpages++; 455 456 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n", 457 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 458 num_physpages << (PAGE_SHIFT - 10), 459 codepages << (PAGE_SHIFT-10), 460 reservedpages << (PAGE_SHIFT - 10), 461 datapages << (PAGE_SHIFT-10), 462 initpages << (PAGE_SHIFT-10), 463 totalhigh_pages << (PAGE_SHIFT-10)); 464} 465 466void free_initmem (void) 467{ 468 unsigned long addr; 469 470 addr = (unsigned long)(&__init_begin); 471 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 472 struct page *p; 473 474 p = virt_to_page(addr); 475 476 ClearPageReserved(p); 477 init_page_count(p); 478 __free_page(p); 479 totalram_pages++; 480 num_physpages++; 481 } 482 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10); 483} 484 485#ifdef CONFIG_BLK_DEV_INITRD 486void free_initrd_mem(unsigned long start, unsigned long end) 487{ 488 if (start < end) 489 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 490 for (; start < end; start += PAGE_SIZE) { 491 struct page *p = virt_to_page(start); 492 493 ClearPageReserved(p); 494 init_page_count(p); 495 __free_page(p); 496 num_physpages++; 497 } 498} 499#endif 500 501void sparc_flush_page_to_ram(struct page *page) 502{ 503 unsigned long vaddr = (unsigned long)page_address(page); 504 505 if (vaddr) 506 __flush_page_to_ram(vaddr); 507} 508