Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1 | /* |
| 2 | * PowerPC version |
| 3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| 4 | * |
| 5 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) |
| 6 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) |
| 7 | * Copyright (C) 1996 Paul Mackerras |
| 8 | * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). |
| 9 | * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) |
| 10 | * |
| 11 | * Derived from "arch/i386/mm/init.c" |
| 12 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or |
| 15 | * modify it under the terms of the GNU General Public License |
| 16 | * as published by the Free Software Foundation; either version |
| 17 | * 2 of the License, or (at your option) any later version. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <linux/config.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/types.h> |
| 28 | #include <linux/mm.h> |
| 29 | #include <linux/stddef.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/bootmem.h> |
| 32 | #include <linux/highmem.h> |
| 33 | #include <linux/initrd.h> |
| 34 | #include <linux/pagemap.h> |
| 35 | |
| 36 | #include <asm/pgalloc.h> |
| 37 | #include <asm/prom.h> |
| 38 | #include <asm/io.h> |
| 39 | #include <asm/mmu_context.h> |
| 40 | #include <asm/pgtable.h> |
| 41 | #include <asm/mmu.h> |
| 42 | #include <asm/smp.h> |
| 43 | #include <asm/machdep.h> |
| 44 | #include <asm/btext.h> |
| 45 | #include <asm/tlb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 46 | #include <asm/prom.h> |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 47 | #include <asm/lmb.h> |
| 48 | #include <asm/sections.h> |
Paul Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 49 | #ifdef CONFIG_PPC64 |
| 50 | #include <asm/vdso.h> |
| 51 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 52 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 53 | #include "mmu_decl.h" |
| 54 | |
| 55 | #ifndef CPU_FTR_COHERENT_ICACHE |
| 56 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ |
| 57 | #define CPU_FTR_NOEXECUTE 0 |
| 58 | #endif |
| 59 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 60 | int init_bootmem_done; |
| 61 | int mem_init_done; |
Paul Mackerras | cf00a8d | 2005-10-31 13:07:02 +1100 | [diff] [blame] | 62 | unsigned long memory_limit; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 63 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 64 | extern void hash_preload(struct mm_struct *mm, unsigned long ea, |
| 65 | unsigned long access, unsigned long trap); |
| 66 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 67 | /* |
| 68 | * This is called by /dev/mem to know if a given address has to |
| 69 | * be mapped non-cacheable or not |
| 70 | */ |
| 71 | int page_is_ram(unsigned long pfn) |
| 72 | { |
| 73 | unsigned long paddr = (pfn << PAGE_SHIFT); |
| 74 | |
| 75 | #ifndef CONFIG_PPC64 /* XXX for now */ |
| 76 | return paddr < __pa(high_memory); |
| 77 | #else |
| 78 | int i; |
| 79 | for (i=0; i < lmb.memory.cnt; i++) { |
| 80 | unsigned long base; |
| 81 | |
| 82 | base = lmb.memory.region[i].base; |
| 83 | |
| 84 | if ((paddr >= base) && |
| 85 | (paddr < (base + lmb.memory.region[i].size))) { |
| 86 | return 1; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | return 0; |
| 91 | #endif |
| 92 | } |
| 93 | EXPORT_SYMBOL(page_is_ram); |
| 94 | |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 95 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 96 | unsigned long size, pgprot_t vma_prot) |
| 97 | { |
| 98 | if (ppc_md.phys_mem_access_prot) |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 99 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 100 | |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 101 | if (!page_is_ram(pfn)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 102 | vma_prot = __pgprot(pgprot_val(vma_prot) |
| 103 | | _PAGE_GUARDED | _PAGE_NO_CACHE); |
| 104 | return vma_prot; |
| 105 | } |
| 106 | EXPORT_SYMBOL(phys_mem_access_prot); |
| 107 | |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 108 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 109 | |
| 110 | void online_page(struct page *page) |
| 111 | { |
| 112 | ClearPageReserved(page); |
| 113 | free_cold_page(page); |
| 114 | totalram_pages++; |
| 115 | num_physpages++; |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * This works only for the non-NUMA case. Later, we'll need a lookup |
| 120 | * to convert from real physical addresses to nid, that doesn't use |
| 121 | * pfn_to_nid(). |
| 122 | */ |
| 123 | int __devinit add_memory(u64 start, u64 size) |
| 124 | { |
| 125 | struct pglist_data *pgdata = NODE_DATA(0); |
| 126 | struct zone *zone; |
| 127 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 128 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 129 | |
| 130 | /* this should work for most non-highmem platforms */ |
| 131 | zone = pgdata->node_zones; |
| 132 | |
| 133 | return __add_pages(zone, start_pfn, nr_pages); |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * First pass at this code will check to determine if the remove |
| 140 | * request is within the RMO. Do not allow removal within the RMO. |
| 141 | */ |
| 142 | int __devinit remove_memory(u64 start, u64 size) |
| 143 | { |
| 144 | struct zone *zone; |
| 145 | unsigned long start_pfn, end_pfn, nr_pages; |
| 146 | |
| 147 | start_pfn = start >> PAGE_SHIFT; |
| 148 | nr_pages = size >> PAGE_SHIFT; |
| 149 | end_pfn = start_pfn + nr_pages; |
| 150 | |
| 151 | printk("%s(): Attempting to remove memoy in range " |
| 152 | "%lx to %lx\n", __func__, start, start+size); |
| 153 | /* |
| 154 | * check for range within RMO |
| 155 | */ |
| 156 | zone = page_zone(pfn_to_page(start_pfn)); |
| 157 | |
| 158 | printk("%s(): memory will be removed from " |
| 159 | "the %s zone\n", __func__, zone->name); |
| 160 | |
| 161 | /* |
| 162 | * not handling removing memory ranges that |
| 163 | * overlap multiple zones yet |
| 164 | */ |
| 165 | if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages)) |
| 166 | goto overlap; |
| 167 | |
| 168 | /* make sure it is NOT in RMO */ |
| 169 | if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) { |
| 170 | printk("%s(): range to be removed must NOT be in RMO!\n", |
| 171 | __func__); |
| 172 | goto in_rmo; |
| 173 | } |
| 174 | |
| 175 | return __remove_pages(zone, start_pfn, nr_pages); |
| 176 | |
| 177 | overlap: |
| 178 | printk("%s(): memory range to be removed overlaps " |
| 179 | "multiple zones!!!\n", __func__); |
| 180 | in_rmo: |
| 181 | return -1; |
| 182 | } |
| 183 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 184 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 185 | void show_mem(void) |
| 186 | { |
| 187 | unsigned long total = 0, reserved = 0; |
| 188 | unsigned long shared = 0, cached = 0; |
| 189 | unsigned long highmem = 0; |
| 190 | struct page *page; |
| 191 | pg_data_t *pgdat; |
| 192 | unsigned long i; |
| 193 | |
| 194 | printk("Mem-info:\n"); |
| 195 | show_free_areas(); |
| 196 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
| 197 | for_each_pgdat(pgdat) { |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 198 | unsigned long flags; |
| 199 | pgdat_resize_lock(pgdat, &flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 200 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
| 201 | page = pgdat_page_nr(pgdat, i); |
| 202 | total++; |
| 203 | if (PageHighMem(page)) |
| 204 | highmem++; |
| 205 | if (PageReserved(page)) |
| 206 | reserved++; |
| 207 | else if (PageSwapCache(page)) |
| 208 | cached++; |
| 209 | else if (page_count(page)) |
| 210 | shared += page_count(page) - 1; |
| 211 | } |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 212 | pgdat_resize_unlock(pgdat, &flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 213 | } |
| 214 | printk("%ld pages of RAM\n", total); |
| 215 | #ifdef CONFIG_HIGHMEM |
| 216 | printk("%ld pages of HIGHMEM\n", highmem); |
| 217 | #endif |
| 218 | printk("%ld reserved pages\n", reserved); |
| 219 | printk("%ld pages shared\n", shared); |
| 220 | printk("%ld pages swap cached\n", cached); |
| 221 | } |
| 222 | |
| 223 | /* |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 224 | * Initialize the bootmem system and give it all the memory we |
| 225 | * have available. If we are using highmem, we only put the |
| 226 | * lowmem into the bootmem system. |
| 227 | */ |
| 228 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
| 229 | void __init do_init_bootmem(void) |
| 230 | { |
| 231 | unsigned long i; |
| 232 | unsigned long start, bootmap_pages; |
| 233 | unsigned long total_pages; |
| 234 | int boot_mapsize; |
| 235 | |
| 236 | max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT; |
| 237 | #ifdef CONFIG_HIGHMEM |
| 238 | total_pages = total_lowmem >> PAGE_SHIFT; |
| 239 | #endif |
| 240 | |
| 241 | /* |
| 242 | * Find an area to use for the bootmem bitmap. Calculate the size of |
| 243 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. |
| 244 | * Add 1 additional page in case the address isn't page-aligned. |
| 245 | */ |
| 246 | bootmap_pages = bootmem_bootmap_pages(total_pages); |
| 247 | |
| 248 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); |
| 249 | BUG_ON(!start); |
| 250 | |
| 251 | boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); |
| 252 | |
| 253 | /* Add all physical memory to the bootmem map, mark each area |
| 254 | * present. |
| 255 | */ |
| 256 | for (i = 0; i < lmb.memory.cnt; i++) { |
| 257 | unsigned long base = lmb.memory.region[i].base; |
| 258 | unsigned long size = lmb_size_bytes(&lmb.memory, i); |
| 259 | #ifdef CONFIG_HIGHMEM |
| 260 | if (base >= total_lowmem) |
| 261 | continue; |
| 262 | if (base + size > total_lowmem) |
| 263 | size = total_lowmem - base; |
| 264 | #endif |
| 265 | free_bootmem(base, size); |
| 266 | } |
| 267 | |
| 268 | /* reserve the sections we're already using */ |
| 269 | for (i = 0; i < lmb.reserved.cnt; i++) |
| 270 | reserve_bootmem(lmb.reserved.region[i].base, |
| 271 | lmb_size_bytes(&lmb.reserved, i)); |
| 272 | |
| 273 | /* XXX need to clip this if using highmem? */ |
| 274 | for (i = 0; i < lmb.memory.cnt; i++) |
| 275 | memory_present(0, lmb_start_pfn(&lmb.memory, i), |
| 276 | lmb_end_pfn(&lmb.memory, i)); |
| 277 | init_bootmem_done = 1; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * paging_init() sets up the page tables - in fact we've already done this. |
| 282 | */ |
| 283 | void __init paging_init(void) |
| 284 | { |
| 285 | unsigned long zones_size[MAX_NR_ZONES]; |
| 286 | unsigned long zholes_size[MAX_NR_ZONES]; |
| 287 | unsigned long total_ram = lmb_phys_mem_size(); |
| 288 | unsigned long top_of_ram = lmb_end_of_DRAM(); |
| 289 | |
| 290 | #ifdef CONFIG_HIGHMEM |
| 291 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ |
| 292 | pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k |
| 293 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); |
| 294 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ |
| 295 | kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k |
| 296 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN); |
| 297 | kmap_prot = PAGE_KERNEL; |
| 298 | #endif /* CONFIG_HIGHMEM */ |
| 299 | |
| 300 | printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n", |
| 301 | top_of_ram, total_ram); |
| 302 | printk(KERN_INFO "Memory hole size: %ldMB\n", |
| 303 | (top_of_ram - total_ram) >> 20); |
| 304 | /* |
| 305 | * All pages are DMA-able so we put them all in the DMA zone. |
| 306 | */ |
| 307 | memset(zones_size, 0, sizeof(zones_size)); |
| 308 | memset(zholes_size, 0, sizeof(zholes_size)); |
| 309 | |
| 310 | zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
| 311 | zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT; |
| 312 | |
| 313 | #ifdef CONFIG_HIGHMEM |
| 314 | zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT; |
| 315 | zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT; |
| 316 | zholes_size[ZONE_HIGHMEM] = (top_of_ram - total_ram) >> PAGE_SHIFT; |
| 317 | #else |
| 318 | zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
| 319 | zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT; |
| 320 | #endif /* CONFIG_HIGHMEM */ |
| 321 | |
| 322 | free_area_init_node(0, NODE_DATA(0), zones_size, |
| 323 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); |
| 324 | } |
| 325 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ |
| 326 | |
| 327 | void __init mem_init(void) |
| 328 | { |
| 329 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
| 330 | int nid; |
| 331 | #endif |
| 332 | pg_data_t *pgdat; |
| 333 | unsigned long i; |
| 334 | struct page *page; |
| 335 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; |
| 336 | |
| 337 | num_physpages = max_pfn; /* RAM is assumed contiguous */ |
| 338 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
| 339 | |
| 340 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
| 341 | for_each_online_node(nid) { |
| 342 | if (NODE_DATA(nid)->node_spanned_pages != 0) { |
| 343 | printk("freeing bootmem node %x\n", nid); |
| 344 | totalram_pages += |
| 345 | free_all_bootmem_node(NODE_DATA(nid)); |
| 346 | } |
| 347 | } |
| 348 | #else |
| 349 | max_mapnr = num_physpages; |
| 350 | totalram_pages += free_all_bootmem(); |
| 351 | #endif |
| 352 | for_each_pgdat(pgdat) { |
| 353 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
| 354 | page = pgdat_page_nr(pgdat, i); |
| 355 | if (PageReserved(page)) |
| 356 | reservedpages++; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; |
Anton Blanchard | bcb3557 | 2005-11-07 17:43:07 +1100 | [diff] [blame^] | 361 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 362 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
| 363 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; |
| 364 | |
| 365 | #ifdef CONFIG_HIGHMEM |
| 366 | { |
| 367 | unsigned long pfn, highmem_mapnr; |
| 368 | |
| 369 | highmem_mapnr = total_lowmem >> PAGE_SHIFT; |
| 370 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
| 371 | struct page *page = pfn_to_page(pfn); |
| 372 | |
| 373 | ClearPageReserved(page); |
| 374 | set_page_count(page, 1); |
| 375 | __free_page(page); |
| 376 | totalhigh_pages++; |
| 377 | } |
| 378 | totalram_pages += totalhigh_pages; |
| 379 | printk(KERN_INFO "High memory: %luk\n", |
| 380 | totalhigh_pages << (PAGE_SHIFT-10)); |
| 381 | } |
| 382 | #endif /* CONFIG_HIGHMEM */ |
| 383 | |
| 384 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " |
| 385 | "%luk reserved, %luk data, %luk bss, %luk init)\n", |
| 386 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), |
| 387 | num_physpages << (PAGE_SHIFT-10), |
| 388 | codesize >> 10, |
| 389 | reservedpages << (PAGE_SHIFT-10), |
| 390 | datasize >> 10, |
| 391 | bsssize >> 10, |
| 392 | initsize >> 10); |
| 393 | |
| 394 | mem_init_done = 1; |
| 395 | |
| 396 | #ifdef CONFIG_PPC64 |
| 397 | /* Initialize the vDSO */ |
| 398 | vdso_init(); |
| 399 | #endif |
| 400 | } |
| 401 | |
| 402 | /* |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 403 | * This is called when a page has been modified by the kernel. |
| 404 | * It just marks the page as not i-cache clean. We do the i-cache |
| 405 | * flush later when the page is given to a user process, if necessary. |
| 406 | */ |
| 407 | void flush_dcache_page(struct page *page) |
| 408 | { |
| 409 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
| 410 | return; |
| 411 | /* avoid an atomic op if possible */ |
| 412 | if (test_bit(PG_arch_1, &page->flags)) |
| 413 | clear_bit(PG_arch_1, &page->flags); |
| 414 | } |
| 415 | EXPORT_SYMBOL(flush_dcache_page); |
| 416 | |
| 417 | void flush_dcache_icache_page(struct page *page) |
| 418 | { |
| 419 | #ifdef CONFIG_BOOKE |
| 420 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); |
| 421 | __flush_dcache_icache(start); |
| 422 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); |
Paul Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 423 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 424 | /* On 8xx there is no need to kmap since highmem is not supported */ |
| 425 | __flush_dcache_icache(page_address(page)); |
| 426 | #else |
| 427 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); |
| 428 | #endif |
| 429 | |
| 430 | } |
| 431 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
| 432 | { |
| 433 | clear_page(page); |
| 434 | |
| 435 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
| 436 | return; |
| 437 | /* |
| 438 | * We shouldnt have to do this, but some versions of glibc |
| 439 | * require it (ld.so assumes zero filled pages are icache clean) |
| 440 | * - Anton |
| 441 | */ |
| 442 | |
| 443 | /* avoid an atomic op if possible */ |
| 444 | if (test_bit(PG_arch_1, &pg->flags)) |
| 445 | clear_bit(PG_arch_1, &pg->flags); |
| 446 | } |
| 447 | EXPORT_SYMBOL(clear_user_page); |
| 448 | |
| 449 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, |
| 450 | struct page *pg) |
| 451 | { |
| 452 | copy_page(vto, vfrom); |
| 453 | |
| 454 | /* |
| 455 | * We should be able to use the following optimisation, however |
| 456 | * there are two problems. |
| 457 | * Firstly a bug in some versions of binutils meant PLT sections |
| 458 | * were not marked executable. |
| 459 | * Secondly the first word in the GOT section is blrl, used |
| 460 | * to establish the GOT address. Until recently the GOT was |
| 461 | * not marked executable. |
| 462 | * - Anton |
| 463 | */ |
| 464 | #if 0 |
| 465 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) |
| 466 | return; |
| 467 | #endif |
| 468 | |
| 469 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
| 470 | return; |
| 471 | |
| 472 | /* avoid an atomic op if possible */ |
| 473 | if (test_bit(PG_arch_1, &pg->flags)) |
| 474 | clear_bit(PG_arch_1, &pg->flags); |
| 475 | } |
| 476 | |
| 477 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, |
| 478 | unsigned long addr, int len) |
| 479 | { |
| 480 | unsigned long maddr; |
| 481 | |
| 482 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); |
| 483 | flush_icache_range(maddr, maddr + len); |
| 484 | kunmap(page); |
| 485 | } |
| 486 | EXPORT_SYMBOL(flush_icache_user_range); |
| 487 | |
| 488 | /* |
| 489 | * This is called at the end of handling a user page fault, when the |
| 490 | * fault has been handled by updating a PTE in the linux page tables. |
| 491 | * We use it to preload an HPTE into the hash table corresponding to |
| 492 | * the updated linux PTE. |
| 493 | * |
| 494 | * This must always be called with the mm->page_table_lock held |
| 495 | */ |
| 496 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, |
| 497 | pte_t pte) |
| 498 | { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 499 | #ifdef CONFIG_PPC_STD_MMU |
| 500 | unsigned long access = 0, trap; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 501 | #endif |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 502 | unsigned long pfn = pte_pfn(pte); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 503 | |
| 504 | /* handle i-cache coherency */ |
| 505 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && |
| 506 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && |
| 507 | pfn_valid(pfn)) { |
| 508 | struct page *page = pfn_to_page(pfn); |
| 509 | if (!PageReserved(page) |
| 510 | && !test_bit(PG_arch_1, &page->flags)) { |
| 511 | if (vma->vm_mm == current->active_mm) { |
| 512 | #ifdef CONFIG_8xx |
| 513 | /* On 8xx, cache control instructions (particularly |
| 514 | * "dcbst" from flush_dcache_icache) fault as write |
| 515 | * operation if there is an unpopulated TLB entry |
| 516 | * for the address in question. To workaround that, |
| 517 | * we invalidate the TLB here, thus avoiding dcbst |
| 518 | * misbehaviour. |
| 519 | */ |
| 520 | _tlbie(address); |
| 521 | #endif |
| 522 | __flush_dcache_icache((void *) address); |
| 523 | } else |
| 524 | flush_dcache_icache_page(page); |
| 525 | set_bit(PG_arch_1, &page->flags); |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | #ifdef CONFIG_PPC_STD_MMU |
| 530 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
| 531 | if (!pte_young(pte) || address >= TASK_SIZE) |
| 532 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 533 | |
| 534 | /* We try to figure out if we are coming from an instruction |
| 535 | * access fault and pass that down to __hash_page so we avoid |
| 536 | * double-faulting on execution of fresh text. We have to test |
| 537 | * for regs NULL since init will get here first thing at boot |
| 538 | * |
| 539 | * We also avoid filling the hash if not coming from a fault |
| 540 | */ |
| 541 | if (current->thread.regs == NULL) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 542 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 543 | trap = TRAP(current->thread.regs); |
| 544 | if (trap == 0x400) |
| 545 | access |= _PAGE_EXEC; |
| 546 | else if (trap != 0x300) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 547 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 548 | hash_preload(vma->vm_mm, address, access, trap); |
| 549 | #endif /* CONFIG_PPC_STD_MMU */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 550 | } |