Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [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> |
| 46 | #include <asm/bootinfo.h> |
| 47 | |
| 48 | #include "mem_pieces.h" |
| 49 | #include "mmu_decl.h" |
| 50 | |
| 51 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) |
| 52 | /* The ammount of lowmem must be within 0xF0000000 - KERNELBASE. */ |
| 53 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE)) |
| 54 | #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL" |
| 55 | #endif |
| 56 | #endif |
| 57 | #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE |
| 58 | |
| 59 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 60 | |
| 61 | unsigned long total_memory; |
| 62 | unsigned long total_lowmem; |
| 63 | |
| 64 | unsigned long ppc_memstart; |
| 65 | unsigned long ppc_memoffset = PAGE_OFFSET; |
| 66 | |
| 67 | int mem_init_done; |
| 68 | int init_bootmem_done; |
| 69 | int boot_mapsize; |
| 70 | #ifdef CONFIG_PPC_PMAC |
| 71 | unsigned long agp_special_page; |
| 72 | #endif |
| 73 | |
| 74 | extern char _end[]; |
| 75 | extern char etext[], _stext[]; |
| 76 | extern char __init_begin, __init_end; |
| 77 | extern char __prep_begin, __prep_end; |
| 78 | extern char __chrp_begin, __chrp_end; |
| 79 | extern char __pmac_begin, __pmac_end; |
| 80 | extern char __openfirmware_begin, __openfirmware_end; |
| 81 | |
| 82 | #ifdef CONFIG_HIGHMEM |
| 83 | pte_t *kmap_pte; |
| 84 | pgprot_t kmap_prot; |
| 85 | |
| 86 | EXPORT_SYMBOL(kmap_prot); |
| 87 | EXPORT_SYMBOL(kmap_pte); |
| 88 | #endif |
| 89 | |
| 90 | void MMU_init(void); |
| 91 | void set_phys_avail(unsigned long total_ram); |
| 92 | |
| 93 | /* XXX should be in current.h -- paulus */ |
| 94 | extern struct task_struct *current_set[NR_CPUS]; |
| 95 | |
| 96 | char *klimit = _end; |
| 97 | struct mem_pieces phys_avail; |
| 98 | |
| 99 | extern char *sysmap; |
| 100 | extern unsigned long sysmap_size; |
| 101 | |
| 102 | /* |
| 103 | * this tells the system to map all of ram with the segregs |
| 104 | * (i.e. page tables) instead of the bats. |
| 105 | * -- Cort |
| 106 | */ |
| 107 | int __map_without_bats; |
| 108 | int __map_without_ltlbs; |
| 109 | |
| 110 | /* max amount of RAM to use */ |
| 111 | unsigned long __max_memory; |
| 112 | /* max amount of low RAM to map in */ |
| 113 | unsigned long __max_low_memory = MAX_LOW_MEM; |
| 114 | |
| 115 | void show_mem(void) |
| 116 | { |
| 117 | int i,free = 0,total = 0,reserved = 0; |
| 118 | int shared = 0, cached = 0; |
| 119 | int highmem = 0; |
| 120 | |
| 121 | printk("Mem-info:\n"); |
| 122 | show_free_areas(); |
| 123 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
| 124 | i = max_mapnr; |
| 125 | while (i-- > 0) { |
| 126 | total++; |
| 127 | if (PageHighMem(mem_map+i)) |
| 128 | highmem++; |
| 129 | if (PageReserved(mem_map+i)) |
| 130 | reserved++; |
| 131 | else if (PageSwapCache(mem_map+i)) |
| 132 | cached++; |
| 133 | else if (!page_count(mem_map+i)) |
| 134 | free++; |
| 135 | else |
| 136 | shared += page_count(mem_map+i) - 1; |
| 137 | } |
| 138 | printk("%d pages of RAM\n",total); |
| 139 | printk("%d pages of HIGHMEM\n", highmem); |
| 140 | printk("%d free pages\n",free); |
| 141 | printk("%d reserved pages\n",reserved); |
| 142 | printk("%d pages shared\n",shared); |
| 143 | printk("%d pages swap cached\n",cached); |
| 144 | } |
| 145 | |
| 146 | /* Free up now-unused memory */ |
| 147 | static void free_sec(unsigned long start, unsigned long end, const char *name) |
| 148 | { |
| 149 | unsigned long cnt = 0; |
| 150 | |
| 151 | while (start < end) { |
| 152 | ClearPageReserved(virt_to_page(start)); |
| 153 | set_page_count(virt_to_page(start), 1); |
| 154 | free_page(start); |
| 155 | cnt++; |
| 156 | start += PAGE_SIZE; |
| 157 | } |
| 158 | if (cnt) { |
| 159 | printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name); |
| 160 | totalram_pages += cnt; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | void free_initmem(void) |
| 165 | { |
| 166 | #define FREESEC(TYPE) \ |
| 167 | free_sec((unsigned long)(&__ ## TYPE ## _begin), \ |
| 168 | (unsigned long)(&__ ## TYPE ## _end), \ |
| 169 | #TYPE); |
| 170 | |
| 171 | printk ("Freeing unused kernel memory:"); |
| 172 | FREESEC(init); |
| 173 | if (_machine != _MACH_Pmac) |
| 174 | FREESEC(pmac); |
| 175 | if (_machine != _MACH_chrp) |
| 176 | FREESEC(chrp); |
| 177 | if (_machine != _MACH_prep) |
| 178 | FREESEC(prep); |
| 179 | if (!have_of) |
| 180 | FREESEC(openfirmware); |
| 181 | printk("\n"); |
| 182 | #undef FREESEC |
| 183 | } |
| 184 | |
| 185 | #ifdef CONFIG_BLK_DEV_INITRD |
| 186 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 187 | { |
| 188 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); |
| 189 | |
| 190 | for (; start < end; start += PAGE_SIZE) { |
| 191 | ClearPageReserved(virt_to_page(start)); |
| 192 | set_page_count(virt_to_page(start), 1); |
| 193 | free_page(start); |
| 194 | totalram_pages++; |
| 195 | } |
| 196 | } |
| 197 | #endif |
| 198 | |
| 199 | /* |
| 200 | * Check for command-line options that affect what MMU_init will do. |
| 201 | */ |
| 202 | void MMU_setup(void) |
| 203 | { |
| 204 | /* Check for nobats option (used in mapin_ram). */ |
| 205 | if (strstr(cmd_line, "nobats")) { |
| 206 | __map_without_bats = 1; |
| 207 | } |
| 208 | |
| 209 | if (strstr(cmd_line, "noltlbs")) { |
| 210 | __map_without_ltlbs = 1; |
| 211 | } |
| 212 | |
| 213 | /* Look for mem= option on command line */ |
| 214 | if (strstr(cmd_line, "mem=")) { |
| 215 | char *p, *q; |
| 216 | unsigned long maxmem = 0; |
| 217 | |
| 218 | for (q = cmd_line; (p = strstr(q, "mem=")) != 0; ) { |
| 219 | q = p + 4; |
| 220 | if (p > cmd_line && p[-1] != ' ') |
| 221 | continue; |
| 222 | maxmem = simple_strtoul(q, &q, 0); |
| 223 | if (*q == 'k' || *q == 'K') { |
| 224 | maxmem <<= 10; |
| 225 | ++q; |
| 226 | } else if (*q == 'm' || *q == 'M') { |
| 227 | maxmem <<= 20; |
| 228 | ++q; |
| 229 | } |
| 230 | } |
| 231 | __max_memory = maxmem; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * MMU_init sets up the basic memory mappings for the kernel, |
| 237 | * including both RAM and possibly some I/O regions, |
| 238 | * and sets up the page tables and the MMU hardware ready to go. |
| 239 | */ |
| 240 | void __init MMU_init(void) |
| 241 | { |
| 242 | if (ppc_md.progress) |
| 243 | ppc_md.progress("MMU:enter", 0x111); |
| 244 | |
| 245 | /* parse args from command line */ |
| 246 | MMU_setup(); |
| 247 | |
| 248 | /* |
| 249 | * Figure out how much memory we have, how much |
| 250 | * is lowmem, and how much is highmem. If we were |
| 251 | * passed the total memory size from the bootloader, |
| 252 | * just use it. |
| 253 | */ |
| 254 | if (boot_mem_size) |
| 255 | total_memory = boot_mem_size; |
| 256 | else |
| 257 | total_memory = ppc_md.find_end_of_memory(); |
| 258 | |
| 259 | if (__max_memory && total_memory > __max_memory) |
| 260 | total_memory = __max_memory; |
| 261 | total_lowmem = total_memory; |
| 262 | #ifdef CONFIG_FSL_BOOKE |
| 263 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB |
| 264 | * entries, so we need to adjust lowmem to match the amount we can map |
| 265 | * in the fixed entries */ |
| 266 | adjust_total_lowmem(); |
| 267 | #endif /* CONFIG_FSL_BOOKE */ |
| 268 | if (total_lowmem > __max_low_memory) { |
| 269 | total_lowmem = __max_low_memory; |
| 270 | #ifndef CONFIG_HIGHMEM |
| 271 | total_memory = total_lowmem; |
| 272 | #endif /* CONFIG_HIGHMEM */ |
| 273 | } |
| 274 | set_phys_avail(total_lowmem); |
| 275 | |
| 276 | /* Initialize the MMU hardware */ |
| 277 | if (ppc_md.progress) |
| 278 | ppc_md.progress("MMU:hw init", 0x300); |
| 279 | MMU_init_hw(); |
| 280 | |
| 281 | /* Map in all of RAM starting at KERNELBASE */ |
| 282 | if (ppc_md.progress) |
| 283 | ppc_md.progress("MMU:mapin", 0x301); |
| 284 | mapin_ram(); |
| 285 | |
| 286 | #ifdef CONFIG_HIGHMEM |
| 287 | ioremap_base = PKMAP_BASE; |
| 288 | #else |
| 289 | ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */ |
| 290 | #endif /* CONFIG_HIGHMEM */ |
| 291 | ioremap_bot = ioremap_base; |
| 292 | |
| 293 | /* Map in I/O resources */ |
| 294 | if (ppc_md.progress) |
| 295 | ppc_md.progress("MMU:setio", 0x302); |
| 296 | if (ppc_md.setup_io_mappings) |
| 297 | ppc_md.setup_io_mappings(); |
| 298 | |
| 299 | /* Initialize the context management stuff */ |
| 300 | mmu_context_init(); |
| 301 | |
| 302 | if (ppc_md.progress) |
| 303 | ppc_md.progress("MMU:exit", 0x211); |
| 304 | |
| 305 | #ifdef CONFIG_BOOTX_TEXT |
| 306 | /* By default, we are no longer mapped */ |
| 307 | boot_text_mapped = 0; |
| 308 | /* Must be done last, or ppc_md.progress will die. */ |
| 309 | map_boot_text(); |
| 310 | #endif |
| 311 | } |
| 312 | |
| 313 | /* This is only called until mem_init is done. */ |
| 314 | void __init *early_get_page(void) |
| 315 | { |
| 316 | void *p; |
| 317 | |
| 318 | if (init_bootmem_done) { |
| 319 | p = alloc_bootmem_pages(PAGE_SIZE); |
| 320 | } else { |
| 321 | p = mem_pieces_find(PAGE_SIZE, PAGE_SIZE); |
| 322 | } |
| 323 | return p; |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * Initialize the bootmem system and give it all the memory we |
| 328 | * have available. |
| 329 | */ |
| 330 | void __init do_init_bootmem(void) |
| 331 | { |
| 332 | unsigned long start, size; |
| 333 | int i; |
| 334 | |
| 335 | /* |
| 336 | * Find an area to use for the bootmem bitmap. |
| 337 | * We look for the first area which is at least |
| 338 | * 128kB in length (128kB is enough for a bitmap |
| 339 | * for 4GB of memory, using 4kB pages), plus 1 page |
| 340 | * (in case the address isn't page-aligned). |
| 341 | */ |
| 342 | start = 0; |
| 343 | size = 0; |
| 344 | for (i = 0; i < phys_avail.n_regions; ++i) { |
| 345 | unsigned long a = phys_avail.regions[i].address; |
| 346 | unsigned long s = phys_avail.regions[i].size; |
| 347 | if (s <= size) |
| 348 | continue; |
| 349 | start = a; |
| 350 | size = s; |
| 351 | if (s >= 33 * PAGE_SIZE) |
| 352 | break; |
| 353 | } |
| 354 | start = PAGE_ALIGN(start); |
| 355 | |
| 356 | min_low_pfn = start >> PAGE_SHIFT; |
| 357 | max_low_pfn = (PPC_MEMSTART + total_lowmem) >> PAGE_SHIFT; |
| 358 | max_pfn = (PPC_MEMSTART + total_memory) >> PAGE_SHIFT; |
| 359 | boot_mapsize = init_bootmem_node(&contig_page_data, min_low_pfn, |
| 360 | PPC_MEMSTART >> PAGE_SHIFT, |
| 361 | max_low_pfn); |
| 362 | |
| 363 | /* remove the bootmem bitmap from the available memory */ |
| 364 | mem_pieces_remove(&phys_avail, start, boot_mapsize, 1); |
| 365 | |
| 366 | /* add everything in phys_avail into the bootmem map */ |
| 367 | for (i = 0; i < phys_avail.n_regions; ++i) |
| 368 | free_bootmem(phys_avail.regions[i].address, |
| 369 | phys_avail.regions[i].size); |
| 370 | |
| 371 | init_bootmem_done = 1; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * paging_init() sets up the page tables - in fact we've already done this. |
| 376 | */ |
| 377 | void __init paging_init(void) |
| 378 | { |
| 379 | unsigned long zones_size[MAX_NR_ZONES], i; |
| 380 | |
| 381 | #ifdef CONFIG_HIGHMEM |
| 382 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ |
| 383 | pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k |
| 384 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); |
| 385 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ |
| 386 | kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k |
| 387 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN); |
| 388 | kmap_prot = PAGE_KERNEL; |
| 389 | #endif /* CONFIG_HIGHMEM */ |
| 390 | |
| 391 | /* |
| 392 | * All pages are DMA-able so we put them all in the DMA zone. |
| 393 | */ |
| 394 | zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT; |
| 395 | for (i = 1; i < MAX_NR_ZONES; i++) |
| 396 | zones_size[i] = 0; |
| 397 | |
| 398 | #ifdef CONFIG_HIGHMEM |
| 399 | zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT; |
| 400 | #endif /* CONFIG_HIGHMEM */ |
| 401 | |
| 402 | free_area_init(zones_size); |
| 403 | } |
| 404 | |
| 405 | void __init mem_init(void) |
| 406 | { |
| 407 | unsigned long addr; |
| 408 | int codepages = 0; |
| 409 | int datapages = 0; |
| 410 | int initpages = 0; |
| 411 | #ifdef CONFIG_HIGHMEM |
| 412 | unsigned long highmem_mapnr; |
| 413 | |
| 414 | highmem_mapnr = total_lowmem >> PAGE_SHIFT; |
| 415 | #endif /* CONFIG_HIGHMEM */ |
| 416 | max_mapnr = total_memory >> PAGE_SHIFT; |
| 417 | |
| 418 | high_memory = (void *) __va(PPC_MEMSTART + total_lowmem); |
| 419 | num_physpages = max_mapnr; /* RAM is assumed contiguous */ |
| 420 | |
| 421 | totalram_pages += free_all_bootmem(); |
| 422 | |
| 423 | #ifdef CONFIG_BLK_DEV_INITRD |
| 424 | /* if we are booted from BootX with an initial ramdisk, |
| 425 | make sure the ramdisk pages aren't reserved. */ |
| 426 | if (initrd_start) { |
| 427 | for (addr = initrd_start; addr < initrd_end; addr += PAGE_SIZE) |
| 428 | ClearPageReserved(virt_to_page(addr)); |
| 429 | } |
| 430 | #endif /* CONFIG_BLK_DEV_INITRD */ |
| 431 | |
| 432 | #ifdef CONFIG_PPC_OF |
| 433 | /* mark the RTAS pages as reserved */ |
| 434 | if ( rtas_data ) |
| 435 | for (addr = (ulong)__va(rtas_data); |
| 436 | addr < PAGE_ALIGN((ulong)__va(rtas_data)+rtas_size) ; |
| 437 | addr += PAGE_SIZE) |
| 438 | SetPageReserved(virt_to_page(addr)); |
| 439 | #endif |
| 440 | #ifdef CONFIG_PPC_PMAC |
| 441 | if (agp_special_page) |
| 442 | SetPageReserved(virt_to_page(agp_special_page)); |
| 443 | #endif |
| 444 | if ( sysmap ) |
| 445 | for (addr = (unsigned long)sysmap; |
| 446 | addr < PAGE_ALIGN((unsigned long)sysmap+sysmap_size) ; |
| 447 | addr += PAGE_SIZE) |
| 448 | SetPageReserved(virt_to_page(addr)); |
| 449 | |
| 450 | for (addr = PAGE_OFFSET; addr < (unsigned long)high_memory; |
| 451 | addr += PAGE_SIZE) { |
| 452 | if (!PageReserved(virt_to_page(addr))) |
| 453 | continue; |
| 454 | if (addr < (ulong) etext) |
| 455 | codepages++; |
| 456 | else if (addr >= (unsigned long)&__init_begin |
| 457 | && addr < (unsigned long)&__init_end) |
| 458 | initpages++; |
| 459 | else if (addr < (ulong) klimit) |
| 460 | datapages++; |
| 461 | } |
| 462 | |
| 463 | #ifdef CONFIG_HIGHMEM |
| 464 | { |
| 465 | unsigned long pfn; |
| 466 | |
| 467 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
| 468 | struct page *page = mem_map + pfn; |
| 469 | |
| 470 | ClearPageReserved(page); |
| 471 | set_bit(PG_highmem, &page->flags); |
| 472 | set_page_count(page, 1); |
| 473 | __free_page(page); |
| 474 | totalhigh_pages++; |
| 475 | } |
| 476 | totalram_pages += totalhigh_pages; |
| 477 | } |
| 478 | #endif /* CONFIG_HIGHMEM */ |
| 479 | |
| 480 | printk("Memory: %luk available (%dk kernel code, %dk data, %dk init, %ldk highmem)\n", |
| 481 | (unsigned long)nr_free_pages()<< (PAGE_SHIFT-10), |
| 482 | codepages<< (PAGE_SHIFT-10), datapages<< (PAGE_SHIFT-10), |
| 483 | initpages<< (PAGE_SHIFT-10), |
| 484 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); |
| 485 | if (sysmap) |
| 486 | printk("System.map loaded at 0x%08x for debugger, size: %ld bytes\n", |
| 487 | (unsigned int)sysmap, sysmap_size); |
| 488 | #ifdef CONFIG_PPC_PMAC |
| 489 | if (agp_special_page) |
| 490 | printk(KERN_INFO "AGP special page: 0x%08lx\n", agp_special_page); |
| 491 | #endif |
| 492 | |
| 493 | mem_init_done = 1; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * Set phys_avail to the amount of physical memory, |
| 498 | * less the kernel text/data/bss. |
| 499 | */ |
| 500 | void __init |
| 501 | set_phys_avail(unsigned long total_memory) |
| 502 | { |
| 503 | unsigned long kstart, ksize; |
| 504 | |
| 505 | /* |
| 506 | * Initially, available physical memory is equivalent to all |
| 507 | * physical memory. |
| 508 | */ |
| 509 | |
| 510 | phys_avail.regions[0].address = PPC_MEMSTART; |
| 511 | phys_avail.regions[0].size = total_memory; |
| 512 | phys_avail.n_regions = 1; |
| 513 | |
| 514 | /* |
| 515 | * Map out the kernel text/data/bss from the available physical |
| 516 | * memory. |
| 517 | */ |
| 518 | |
| 519 | kstart = __pa(_stext); /* should be 0 */ |
| 520 | ksize = PAGE_ALIGN(klimit - _stext); |
| 521 | |
| 522 | mem_pieces_remove(&phys_avail, kstart, ksize, 0); |
| 523 | mem_pieces_remove(&phys_avail, 0, 0x4000, 0); |
| 524 | |
| 525 | #if defined(CONFIG_BLK_DEV_INITRD) |
| 526 | /* Remove the init RAM disk from the available memory. */ |
| 527 | if (initrd_start) { |
| 528 | mem_pieces_remove(&phys_avail, __pa(initrd_start), |
| 529 | initrd_end - initrd_start, 1); |
| 530 | } |
| 531 | #endif /* CONFIG_BLK_DEV_INITRD */ |
| 532 | #ifdef CONFIG_PPC_OF |
| 533 | /* remove the RTAS pages from the available memory */ |
| 534 | if (rtas_data) |
| 535 | mem_pieces_remove(&phys_avail, rtas_data, rtas_size, 1); |
| 536 | #endif |
| 537 | /* remove the sysmap pages from the available memory */ |
| 538 | if (sysmap) |
| 539 | mem_pieces_remove(&phys_avail, __pa(sysmap), sysmap_size, 1); |
| 540 | #ifdef CONFIG_PPC_PMAC |
| 541 | /* Because of some uninorth weirdness, we need a page of |
| 542 | * memory as high as possible (it must be outside of the |
| 543 | * bus address seen as the AGP aperture). It will be used |
| 544 | * by the r128 DRM driver |
| 545 | * |
| 546 | * FIXME: We need to make sure that page doesn't overlap any of the\ |
| 547 | * above. This could be done by improving mem_pieces_find to be able |
| 548 | * to do a backward search from the end of the list. |
| 549 | */ |
| 550 | if (_machine == _MACH_Pmac && find_devices("uni-north-agp")) { |
| 551 | agp_special_page = (total_memory - PAGE_SIZE); |
| 552 | mem_pieces_remove(&phys_avail, agp_special_page, PAGE_SIZE, 0); |
| 553 | agp_special_page = (unsigned long)__va(agp_special_page); |
| 554 | } |
| 555 | #endif /* CONFIG_PPC_PMAC */ |
| 556 | } |
| 557 | |
| 558 | /* Mark some memory as reserved by removing it from phys_avail. */ |
| 559 | void __init reserve_phys_mem(unsigned long start, unsigned long size) |
| 560 | { |
| 561 | mem_pieces_remove(&phys_avail, start, size, 1); |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * This is called when a page has been modified by the kernel. |
| 566 | * It just marks the page as not i-cache clean. We do the i-cache |
| 567 | * flush later when the page is given to a user process, if necessary. |
| 568 | */ |
| 569 | void flush_dcache_page(struct page *page) |
| 570 | { |
| 571 | clear_bit(PG_arch_1, &page->flags); |
| 572 | } |
| 573 | |
| 574 | void flush_dcache_icache_page(struct page *page) |
| 575 | { |
| 576 | #ifdef CONFIG_BOOKE |
| 577 | __flush_dcache_icache(kmap(page)); |
| 578 | kunmap(page); |
| 579 | #else |
| 580 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); |
| 581 | #endif |
| 582 | |
| 583 | } |
| 584 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
| 585 | { |
| 586 | clear_page(page); |
| 587 | clear_bit(PG_arch_1, &pg->flags); |
| 588 | } |
| 589 | |
| 590 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, |
| 591 | struct page *pg) |
| 592 | { |
| 593 | copy_page(vto, vfrom); |
| 594 | clear_bit(PG_arch_1, &pg->flags); |
| 595 | } |
| 596 | |
| 597 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, |
| 598 | unsigned long addr, int len) |
| 599 | { |
| 600 | unsigned long maddr; |
| 601 | |
| 602 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); |
| 603 | flush_icache_range(maddr, maddr + len); |
| 604 | kunmap(page); |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * This is called at the end of handling a user page fault, when the |
| 609 | * fault has been handled by updating a PTE in the linux page tables. |
| 610 | * We use it to preload an HPTE into the hash table corresponding to |
| 611 | * the updated linux PTE. |
| 612 | */ |
| 613 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, |
| 614 | pte_t pte) |
| 615 | { |
| 616 | /* handle i-cache coherency */ |
| 617 | unsigned long pfn = pte_pfn(pte); |
| 618 | |
| 619 | if (pfn_valid(pfn)) { |
| 620 | struct page *page = pfn_to_page(pfn); |
| 621 | if (!PageReserved(page) |
| 622 | && !test_bit(PG_arch_1, &page->flags)) { |
| 623 | if (vma->vm_mm == current->active_mm) |
| 624 | __flush_dcache_icache((void *) address); |
| 625 | else |
| 626 | flush_dcache_icache_page(page); |
| 627 | set_bit(PG_arch_1, &page->flags); |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | #ifdef CONFIG_PPC_STD_MMU |
| 632 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
| 633 | if (Hash != 0 && pte_young(pte)) { |
| 634 | struct mm_struct *mm; |
| 635 | pmd_t *pmd; |
| 636 | |
| 637 | mm = (address < TASK_SIZE)? vma->vm_mm: &init_mm; |
| 638 | pmd = pmd_offset(pgd_offset(mm, address), address); |
| 639 | if (!pmd_none(*pmd)) |
| 640 | add_hash_page(mm->context, address, pmd_val(*pmd)); |
| 641 | } |
| 642 | #endif |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * This is called by /dev/mem to know if a given address has to |
| 647 | * be mapped non-cacheable or not |
| 648 | */ |
| 649 | int page_is_ram(unsigned long pfn) |
| 650 | { |
| 651 | unsigned long paddr = (pfn << PAGE_SHIFT); |
| 652 | |
| 653 | return paddr < __pa(high_memory); |
| 654 | } |
| 655 | |
| 656 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr, |
| 657 | unsigned long size, pgprot_t vma_prot) |
| 658 | { |
| 659 | if (ppc_md.phys_mem_access_prot) |
| 660 | return ppc_md.phys_mem_access_prot(file, addr, size, vma_prot); |
| 661 | |
| 662 | if (!page_is_ram(addr >> PAGE_SHIFT)) |
| 663 | vma_prot = __pgprot(pgprot_val(vma_prot) |
| 664 | | _PAGE_GUARDED | _PAGE_NO_CACHE); |
| 665 | return vma_prot; |
| 666 | } |
| 667 | EXPORT_SYMBOL(phys_mem_access_prot); |