1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994 - 2000 Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com 9 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. 10 */ 11 #include <linux/init.h> 12 #include <linux/module.h> 13 #include <linux/signal.h> 14 #include <linux/sched.h> 15 #include <linux/kernel.h> 16 #include <linux/errno.h> 17 #include <linux/string.h> 18 #include <linux/types.h> 19 #include <linux/pagemap.h> 20 #include <linux/ptrace.h> 21 #include <linux/mman.h> 22 #include <linux/mm.h> 23 #include <linux/bootmem.h> 24 #include <linux/highmem.h> 25 #include <linux/swap.h> 26 #include <linux/proc_fs.h> 27 #include <linux/pfn.h> 28 29 #include <asm/bootinfo.h> 30 #include <asm/cachectl.h> 31 #include <asm/cpu.h> 32 #include <asm/dma.h> 33 #include <asm/kmap_types.h> 34 #include <asm/mmu_context.h> 35 #include <asm/sections.h> 36 #include <asm/pgtable.h> 37 #include <asm/pgalloc.h> 38 #include <asm/tlb.h> 39 #include <asm/fixmap.h> 40 41 /* Atomicity and interruptability */ 42 #ifdef CONFIG_MIPS_MT_SMTC 43 44 #include <asm/mipsmtregs.h> 45 46 #define ENTER_CRITICAL(flags) \ 47 { \ 48 unsigned int mvpflags; \ 49 local_irq_save(flags);\ 50 mvpflags = dvpe() 51 #define EXIT_CRITICAL(flags) \ 52 evpe(mvpflags); \ 53 local_irq_restore(flags); \ 54 } 55 #else 56 57 #define ENTER_CRITICAL(flags) local_irq_save(flags) 58 #define EXIT_CRITICAL(flags) local_irq_restore(flags) 59 60 #endif /* CONFIG_MIPS_MT_SMTC */ 61 62 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 63 64 unsigned long highstart_pfn, highend_pfn; 65 66 /* 67 * We have up to 8 empty zeroed pages so we can map one of the right colour 68 * when needed. This is necessary only on R4000 / R4400 SC and MC versions 69 * where we have to avoid VCED / VECI exceptions for good performance at 70 * any price. Since page is never written to after the initialization we 71 * don't have to care about aliases on other CPUs. 72 */ 73 unsigned long empty_zero_page, zero_page_mask; 74 75 /* 76 * Not static inline because used by IP27 special magic initialization code 77 */ 78 unsigned long setup_zero_pages(void) 79 { 80 unsigned int order; 81 unsigned long size; 82 struct page *page; 83 84 if (cpu_has_vce) 85 order = 3; 86 else 87 order = 0; 88 89 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 90 if (!empty_zero_page) 91 panic("Oh boy, that early out of memory?"); 92 93 page = virt_to_page((void *)empty_zero_page); 94 split_page(page, order); 95 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) { 96 SetPageReserved(page); 97 page++; 98 } 99 100 size = PAGE_SIZE << order; 101 zero_page_mask = (size - 1) & PAGE_MASK; 102 103 return 1UL << order; 104 } 105 106 /* 107 * These are almost like kmap_atomic / kunmap_atmic except they take an 108 * additional address argument as the hint. 109 */ 110 111 #define kmap_get_fixmap_pte(vaddr) \ 112 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) 113 114 #ifdef CONFIG_MIPS_MT_SMTC 115 static pte_t *kmap_coherent_pte; 116 static void __init kmap_coherent_init(void) 117 { 118 unsigned long vaddr; 119 120 /* cache the first coherent kmap pte */ 121 vaddr = __fix_to_virt(FIX_CMAP_BEGIN); 122 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr); 123 } 124 #else 125 static inline void kmap_coherent_init(void) {} 126 #endif 127 128 static inline void *kmap_coherent(struct page *page, unsigned long addr) 129 { 130 enum fixed_addresses idx; 131 unsigned long vaddr, flags, entrylo; 132 unsigned long old_ctx; 133 pte_t pte; 134 int tlbidx; 135 136 inc_preempt_count(); 137 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1); 138 #ifdef CONFIG_MIPS_MT_SMTC 139 idx += FIX_N_COLOURS * smp_processor_id(); 140 #endif 141 vaddr = __fix_to_virt(FIX_CMAP_END - idx); 142 pte = mk_pte(page, PAGE_KERNEL); 143 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) 144 entrylo = pte.pte_high; 145 #else 146 entrylo = pte_val(pte) >> 6; 147 #endif 148 149 ENTER_CRITICAL(flags); 150 old_ctx = read_c0_entryhi(); 151 write_c0_entryhi(vaddr & (PAGE_MASK << 1)); 152 write_c0_entrylo0(entrylo); 153 write_c0_entrylo1(entrylo); 154 #ifdef CONFIG_MIPS_MT_SMTC 155 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte); 156 /* preload TLB instead of local_flush_tlb_one() */ 157 mtc0_tlbw_hazard(); 158 tlb_probe(); 159 tlb_probe_hazard(); 160 tlbidx = read_c0_index(); 161 mtc0_tlbw_hazard(); 162 if (tlbidx < 0) 163 tlb_write_random(); 164 else 165 tlb_write_indexed(); 166 #else 167 tlbidx = read_c0_wired(); 168 write_c0_wired(tlbidx + 1); 169 write_c0_index(tlbidx); 170 mtc0_tlbw_hazard(); 171 tlb_write_indexed(); 172 #endif 173 tlbw_use_hazard(); 174 write_c0_entryhi(old_ctx); 175 EXIT_CRITICAL(flags); 176 177 return (void*) vaddr; 178 } 179 180 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1))) 181 182 static inline void kunmap_coherent(struct page *page) 183 { 184 #ifndef CONFIG_MIPS_MT_SMTC 185 unsigned int wired; 186 unsigned long flags, old_ctx; 187 188 ENTER_CRITICAL(flags); 189 old_ctx = read_c0_entryhi(); 190 wired = read_c0_wired() - 1; 191 write_c0_wired(wired); 192 write_c0_index(wired); 193 write_c0_entryhi(UNIQUE_ENTRYHI(wired)); 194 write_c0_entrylo0(0); 195 write_c0_entrylo1(0); 196 mtc0_tlbw_hazard(); 197 tlb_write_indexed(); 198 tlbw_use_hazard(); 199 write_c0_entryhi(old_ctx); 200 EXIT_CRITICAL(flags); 201 #endif 202 dec_preempt_count(); 203 preempt_check_resched(); 204 } 205 206 void copy_to_user_page(struct vm_area_struct *vma, 207 struct page *page, unsigned long vaddr, void *dst, const void *src, 208 unsigned long len) 209 { 210 if (cpu_has_dc_aliases) { 211 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); 212 memcpy(vto, src, len); 213 kunmap_coherent(page); 214 } else 215 memcpy(dst, src, len); 216 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) 217 flush_cache_page(vma, vaddr, page_to_pfn(page)); 218 } 219 220 EXPORT_SYMBOL(copy_to_user_page); 221 222 void copy_from_user_page(struct vm_area_struct *vma, 223 struct page *page, unsigned long vaddr, void *dst, const void *src, 224 unsigned long len) 225 { 226 if (cpu_has_dc_aliases) { 227 void *vfrom = 228 kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); 229 memcpy(dst, vfrom, len); 230 kunmap_coherent(page); 231 } else 232 memcpy(dst, src, len); 233 } 234 235 EXPORT_SYMBOL(copy_from_user_page); 236 237 238 #ifdef CONFIG_HIGHMEM 239 pte_t *kmap_pte; 240 pgprot_t kmap_prot; 241 242 static void __init kmap_init(void) 243 { 244 unsigned long kmap_vstart; 245 246 /* cache the first kmap pte */ 247 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); 248 kmap_pte = kmap_get_fixmap_pte(kmap_vstart); 249 250 kmap_prot = PAGE_KERNEL; 251 } 252 #endif /* CONFIG_HIGHMEM */ 253 254 void __init fixrange_init(unsigned long start, unsigned long end, 255 pgd_t *pgd_base) 256 { 257 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC) 258 pgd_t *pgd; 259 pud_t *pud; 260 pmd_t *pmd; 261 pte_t *pte; 262 int i, j, k; 263 unsigned long vaddr; 264 265 vaddr = start; 266 i = __pgd_offset(vaddr); 267 j = __pud_offset(vaddr); 268 k = __pmd_offset(vaddr); 269 pgd = pgd_base + i; 270 271 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 272 pud = (pud_t *)pgd; 273 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 274 pmd = (pmd_t *)pud; 275 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 276 if (pmd_none(*pmd)) { 277 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 278 set_pmd(pmd, __pmd((unsigned long)pte)); 279 if (pte != pte_offset_kernel(pmd, 0)) 280 BUG(); 281 } 282 vaddr += PMD_SIZE; 283 } 284 k = 0; 285 } 286 j = 0; 287 } 288 #endif 289 } 290 291 #ifndef CONFIG_NEED_MULTIPLE_NODES 292 extern void pagetable_init(void); 293 294 static int __init page_is_ram(unsigned long pagenr) 295 { 296 int i; 297 298 for (i = 0; i < boot_mem_map.nr_map; i++) { 299 unsigned long addr, end; 300 301 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 302 /* not usable memory */ 303 continue; 304 305 addr = PFN_UP(boot_mem_map.map[i].addr); 306 end = PFN_DOWN(boot_mem_map.map[i].addr + 307 boot_mem_map.map[i].size); 308 309 if (pagenr >= addr && pagenr < end) 310 return 1; 311 } 312 313 return 0; 314 } 315 316 void __init paging_init(void) 317 { 318 unsigned long zones_size[MAX_NR_ZONES] = { 0, }; 319 unsigned long max_dma, high, low; 320 #ifndef CONFIG_FLATMEM 321 unsigned long zholes_size[MAX_NR_ZONES] = { 0, }; 322 unsigned long i, j, pfn; 323 #endif 324 325 pagetable_init(); 326 327 #ifdef CONFIG_HIGHMEM 328 kmap_init(); 329 #endif 330 kmap_coherent_init(); 331 332 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; 333 low = max_low_pfn; 334 high = highend_pfn; 335 336 #ifdef CONFIG_ISA 337 if (low < max_dma) 338 zones_size[ZONE_DMA] = low; 339 else { 340 zones_size[ZONE_DMA] = max_dma; 341 zones_size[ZONE_NORMAL] = low - max_dma; 342 } 343 #else 344 zones_size[ZONE_DMA] = low; 345 #endif 346 #ifdef CONFIG_HIGHMEM 347 if (cpu_has_dc_aliases) { 348 printk(KERN_WARNING "This processor doesn't support highmem."); 349 if (high - low) 350 printk(" %ldk highmem ignored", high - low); 351 printk("\n"); 352 } else 353 zones_size[ZONE_HIGHMEM] = high - low; 354 #endif 355 356 #ifdef CONFIG_FLATMEM 357 free_area_init(zones_size); 358 #else 359 pfn = 0; 360 for (i = 0; i < MAX_NR_ZONES; i++) 361 for (j = 0; j < zones_size[i]; j++, pfn++) 362 if (!page_is_ram(pfn)) 363 zholes_size[i]++; 364 free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size); 365 #endif 366 } 367 368 static struct kcore_list kcore_mem, kcore_vmalloc; 369 #ifdef CONFIG_64BIT 370 static struct kcore_list kcore_kseg0; 371 #endif 372 373 void __init mem_init(void) 374 { 375 unsigned long codesize, reservedpages, datasize, initsize; 376 unsigned long tmp, ram; 377 378 #ifdef CONFIG_HIGHMEM 379 #ifdef CONFIG_DISCONTIGMEM 380 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet" 381 #endif 382 max_mapnr = highend_pfn; 383 #else 384 max_mapnr = max_low_pfn; 385 #endif 386 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 387 388 totalram_pages += free_all_bootmem(); 389 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ 390 391 reservedpages = ram = 0; 392 for (tmp = 0; tmp < max_low_pfn; tmp++) 393 if (page_is_ram(tmp)) { 394 ram++; 395 if (PageReserved(pfn_to_page(tmp))) 396 reservedpages++; 397 } 398 num_physpages = ram; 399 400 #ifdef CONFIG_HIGHMEM 401 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { 402 struct page *page = mem_map + tmp; 403 404 if (!page_is_ram(tmp)) { 405 SetPageReserved(page); 406 continue; 407 } 408 ClearPageReserved(page); 409 #ifdef CONFIG_LIMITED_DMA 410 set_page_address(page, lowmem_page_address(page)); 411 #endif 412 init_page_count(page); 413 __free_page(page); 414 totalhigh_pages++; 415 } 416 totalram_pages += totalhigh_pages; 417 num_physpages += totalhigh_pages; 418 #endif 419 420 codesize = (unsigned long) &_etext - (unsigned long) &_text; 421 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 422 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 423 424 #ifdef CONFIG_64BIT 425 if ((unsigned long) &_text > (unsigned long) CKSEG0) 426 /* The -4 is a hack so that user tools don't have to handle 427 the overflow. */ 428 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4); 429 #endif 430 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 431 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 432 VMALLOC_END-VMALLOC_START); 433 434 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 435 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", 436 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 437 ram << (PAGE_SHIFT-10), 438 codesize >> 10, 439 reservedpages << (PAGE_SHIFT-10), 440 datasize >> 10, 441 initsize >> 10, 442 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); 443 } 444 #endif /* !CONFIG_NEED_MULTIPLE_NODES */ 445 446 static void free_init_pages(char *what, unsigned long begin, unsigned long end) 447 { 448 unsigned long pfn; 449 450 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) { 451 struct page *page = pfn_to_page(pfn); 452 void *addr = phys_to_virt(PFN_PHYS(pfn)); 453 454 ClearPageReserved(page); 455 init_page_count(page); 456 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); 457 __free_page(page); 458 totalram_pages++; 459 } 460 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); 461 } 462 463 #ifdef CONFIG_BLK_DEV_INITRD 464 void free_initrd_mem(unsigned long start, unsigned long end) 465 { 466 free_init_pages("initrd memory", 467 virt_to_phys((void *)start), 468 virt_to_phys((void *)end)); 469 } 470 #endif 471 472 extern unsigned long prom_free_prom_memory(void); 473 474 void free_initmem(void) 475 { 476 unsigned long freed; 477 478 freed = prom_free_prom_memory(); 479 if (freed) 480 printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed); 481 482 free_init_pages("unused kernel memory", 483 __pa_symbol(&__init_begin), 484 __pa_symbol(&__init_end)); 485 } 486