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 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) 9 * 10 * Derived from "arch/i386/mm/init.c" 11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License 15 * as published by the Free Software Foundation; either version 16 * 2 of the License, or (at your option) any later version. 17 * 18 */ 19 20 #include <linux/module.h> 21 #include <linux/sched.h> 22 #include <linux/kernel.h> 23 #include <linux/errno.h> 24 #include <linux/string.h> 25 #include <linux/gfp.h> 26 #include <linux/types.h> 27 #include <linux/mm.h> 28 #include <linux/stddef.h> 29 #include <linux/init.h> 30 #include <linux/bootmem.h> 31 #include <linux/highmem.h> 32 #include <linux/initrd.h> 33 #include <linux/pagemap.h> 34 #include <linux/suspend.h> 35 #include <linux/memblock.h> 36 #include <linux/hugetlb.h> 37 38 #include <asm/pgalloc.h> 39 #include <asm/prom.h> 40 #include <asm/io.h> 41 #include <asm/mmu_context.h> 42 #include <asm/pgtable.h> 43 #include <asm/mmu.h> 44 #include <asm/smp.h> 45 #include <asm/machdep.h> 46 #include <asm/btext.h> 47 #include <asm/tlb.h> 48 #include <asm/sections.h> 49 #include <asm/sparsemem.h> 50 #include <asm/vdso.h> 51 #include <asm/fixmap.h> 52 #include <asm/swiotlb.h> 53 54 #include "mmu_decl.h" 55 56 #ifndef CPU_FTR_COHERENT_ICACHE 57 #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ 58 #define CPU_FTR_NOEXECUTE 0 59 #endif 60 61 int init_bootmem_done; 62 int mem_init_done; 63 phys_addr_t memory_limit; 64 65 #ifdef CONFIG_HIGHMEM 66 pte_t *kmap_pte; 67 pgprot_t kmap_prot; 68 69 EXPORT_SYMBOL(kmap_prot); 70 EXPORT_SYMBOL(kmap_pte); 71 72 static inline pte_t *virt_to_kpte(unsigned long vaddr) 73 { 74 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), 75 vaddr), vaddr), vaddr); 76 } 77 #endif 78 79 int page_is_ram(unsigned long pfn) 80 { 81 #ifndef CONFIG_PPC64 /* XXX for now */ 82 return pfn < max_pfn; 83 #else 84 unsigned long paddr = (pfn << PAGE_SHIFT); 85 int i; 86 for (i=0; i < memblock.memory.cnt; i++) { 87 unsigned long base; 88 89 base = memblock.memory.region[i].base; 90 91 if ((paddr >= base) && 92 (paddr < (base + memblock.memory.region[i].size))) { 93 return 1; 94 } 95 } 96 97 return 0; 98 #endif 99 } 100 101 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 102 unsigned long size, pgprot_t vma_prot) 103 { 104 if (ppc_md.phys_mem_access_prot) 105 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); 106 107 if (!page_is_ram(pfn)) 108 vma_prot = pgprot_noncached(vma_prot); 109 110 return vma_prot; 111 } 112 EXPORT_SYMBOL(phys_mem_access_prot); 113 114 #ifdef CONFIG_MEMORY_HOTPLUG 115 116 #ifdef CONFIG_NUMA 117 int memory_add_physaddr_to_nid(u64 start) 118 { 119 return hot_add_scn_to_nid(start); 120 } 121 #endif 122 123 int arch_add_memory(int nid, u64 start, u64 size) 124 { 125 struct pglist_data *pgdata; 126 struct zone *zone; 127 unsigned long start_pfn = start >> PAGE_SHIFT; 128 unsigned long nr_pages = size >> PAGE_SHIFT; 129 130 pgdata = NODE_DATA(nid); 131 132 start = (unsigned long)__va(start); 133 create_section_mapping(start, start + size); 134 135 /* this should work for most non-highmem platforms */ 136 zone = pgdata->node_zones; 137 138 return __add_pages(nid, zone, start_pfn, nr_pages); 139 } 140 #endif /* CONFIG_MEMORY_HOTPLUG */ 141 142 /* 143 * walk_memory_resource() needs to make sure there is no holes in a given 144 * memory range. PPC64 does not maintain the memory layout in /proc/iomem. 145 * Instead it maintains it in memblock.memory structures. Walk through the 146 * memory regions, find holes and callback for contiguous regions. 147 */ 148 int 149 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, 150 void *arg, int (*func)(unsigned long, unsigned long, void *)) 151 { 152 struct memblock_property res; 153 unsigned long pfn, len; 154 u64 end; 155 int ret = -1; 156 157 res.base = (u64) start_pfn << PAGE_SHIFT; 158 res.size = (u64) nr_pages << PAGE_SHIFT; 159 160 end = res.base + res.size - 1; 161 while ((res.base < end) && (memblock_find(&res) >= 0)) { 162 pfn = (unsigned long)(res.base >> PAGE_SHIFT); 163 len = (unsigned long)(res.size >> PAGE_SHIFT); 164 ret = (*func)(pfn, len, arg); 165 if (ret) 166 break; 167 res.base += (res.size + 1); 168 res.size = (end - res.base + 1); 169 } 170 return ret; 171 } 172 EXPORT_SYMBOL_GPL(walk_system_ram_range); 173 174 /* 175 * Initialize the bootmem system and give it all the memory we 176 * have available. If we are using highmem, we only put the 177 * lowmem into the bootmem system. 178 */ 179 #ifndef CONFIG_NEED_MULTIPLE_NODES 180 void __init do_init_bootmem(void) 181 { 182 unsigned long i; 183 unsigned long start, bootmap_pages; 184 unsigned long total_pages; 185 int boot_mapsize; 186 187 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 188 total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; 189 #ifdef CONFIG_HIGHMEM 190 total_pages = total_lowmem >> PAGE_SHIFT; 191 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; 192 #endif 193 194 /* 195 * Find an area to use for the bootmem bitmap. Calculate the size of 196 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. 197 * Add 1 additional page in case the address isn't page-aligned. 198 */ 199 bootmap_pages = bootmem_bootmap_pages(total_pages); 200 201 start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); 202 203 min_low_pfn = MEMORY_START >> PAGE_SHIFT; 204 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); 205 206 /* Add active regions with valid PFNs */ 207 for (i = 0; i < memblock.memory.cnt; i++) { 208 unsigned long start_pfn, end_pfn; 209 start_pfn = memblock.memory.region[i].base >> PAGE_SHIFT; 210 end_pfn = start_pfn + memblock_size_pages(&memblock.memory, i); 211 add_active_range(0, start_pfn, end_pfn); 212 } 213 214 /* Add all physical memory to the bootmem map, mark each area 215 * present. 216 */ 217 #ifdef CONFIG_HIGHMEM 218 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); 219 220 /* reserve the sections we're already using */ 221 for (i = 0; i < memblock.reserved.cnt; i++) { 222 unsigned long addr = memblock.reserved.region[i].base + 223 memblock_size_bytes(&memblock.reserved, i) - 1; 224 if (addr < lowmem_end_addr) 225 reserve_bootmem(memblock.reserved.region[i].base, 226 memblock_size_bytes(&memblock.reserved, i), 227 BOOTMEM_DEFAULT); 228 else if (memblock.reserved.region[i].base < lowmem_end_addr) { 229 unsigned long adjusted_size = lowmem_end_addr - 230 memblock.reserved.region[i].base; 231 reserve_bootmem(memblock.reserved.region[i].base, 232 adjusted_size, BOOTMEM_DEFAULT); 233 } 234 } 235 #else 236 free_bootmem_with_active_regions(0, max_pfn); 237 238 /* reserve the sections we're already using */ 239 for (i = 0; i < memblock.reserved.cnt; i++) 240 reserve_bootmem(memblock.reserved.region[i].base, 241 memblock_size_bytes(&memblock.reserved, i), 242 BOOTMEM_DEFAULT); 243 244 #endif 245 /* XXX need to clip this if using highmem? */ 246 sparse_memory_present_with_active_regions(0); 247 248 init_bootmem_done = 1; 249 } 250 251 /* mark pages that don't exist as nosave */ 252 static int __init mark_nonram_nosave(void) 253 { 254 unsigned long memblock_next_region_start_pfn, 255 memblock_region_max_pfn; 256 int i; 257 258 for (i = 0; i < memblock.memory.cnt - 1; i++) { 259 memblock_region_max_pfn = 260 (memblock.memory.region[i].base >> PAGE_SHIFT) + 261 (memblock.memory.region[i].size >> PAGE_SHIFT); 262 memblock_next_region_start_pfn = 263 memblock.memory.region[i+1].base >> PAGE_SHIFT; 264 265 if (memblock_region_max_pfn < memblock_next_region_start_pfn) 266 register_nosave_region(memblock_region_max_pfn, 267 memblock_next_region_start_pfn); 268 } 269 270 return 0; 271 } 272 273 /* 274 * paging_init() sets up the page tables - in fact we've already done this. 275 */ 276 void __init paging_init(void) 277 { 278 unsigned long total_ram = memblock_phys_mem_size(); 279 phys_addr_t top_of_ram = memblock_end_of_DRAM(); 280 unsigned long max_zone_pfns[MAX_NR_ZONES]; 281 282 #ifdef CONFIG_PPC32 283 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); 284 unsigned long end = __fix_to_virt(FIX_HOLE); 285 286 for (; v < end; v += PAGE_SIZE) 287 map_page(v, 0, 0); /* XXX gross */ 288 #endif 289 290 #ifdef CONFIG_HIGHMEM 291 map_page(PKMAP_BASE, 0, 0); /* XXX gross */ 292 pkmap_page_table = virt_to_kpte(PKMAP_BASE); 293 294 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); 295 kmap_prot = PAGE_KERNEL; 296 #endif /* CONFIG_HIGHMEM */ 297 298 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n", 299 (unsigned long long)top_of_ram, total_ram); 300 printk(KERN_DEBUG "Memory hole size: %ldMB\n", 301 (long int)((top_of_ram - total_ram) >> 20)); 302 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 303 #ifdef CONFIG_HIGHMEM 304 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; 305 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; 306 #else 307 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; 308 #endif 309 free_area_init_nodes(max_zone_pfns); 310 311 mark_nonram_nosave(); 312 } 313 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ 314 315 void __init mem_init(void) 316 { 317 #ifdef CONFIG_NEED_MULTIPLE_NODES 318 int nid; 319 #endif 320 pg_data_t *pgdat; 321 unsigned long i; 322 struct page *page; 323 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; 324 325 #ifdef CONFIG_SWIOTLB 326 if (ppc_swiotlb_enable) 327 swiotlb_init(1); 328 #endif 329 330 num_physpages = memblock.memory.size >> PAGE_SHIFT; 331 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 332 333 #ifdef CONFIG_NEED_MULTIPLE_NODES 334 for_each_online_node(nid) { 335 if (NODE_DATA(nid)->node_spanned_pages != 0) { 336 printk("freeing bootmem node %d\n", nid); 337 totalram_pages += 338 free_all_bootmem_node(NODE_DATA(nid)); 339 } 340 } 341 #else 342 max_mapnr = max_pfn; 343 totalram_pages += free_all_bootmem(); 344 #endif 345 for_each_online_pgdat(pgdat) { 346 for (i = 0; i < pgdat->node_spanned_pages; i++) { 347 if (!pfn_valid(pgdat->node_start_pfn + i)) 348 continue; 349 page = pgdat_page_nr(pgdat, i); 350 if (PageReserved(page)) 351 reservedpages++; 352 } 353 } 354 355 codesize = (unsigned long)&_sdata - (unsigned long)&_stext; 356 datasize = (unsigned long)&_edata - (unsigned long)&_sdata; 357 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; 358 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; 359 360 #ifdef CONFIG_HIGHMEM 361 { 362 unsigned long pfn, highmem_mapnr; 363 364 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; 365 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { 366 struct page *page = pfn_to_page(pfn); 367 if (memblock_is_reserved(pfn << PAGE_SHIFT)) 368 continue; 369 ClearPageReserved(page); 370 init_page_count(page); 371 __free_page(page); 372 totalhigh_pages++; 373 reservedpages--; 374 } 375 totalram_pages += totalhigh_pages; 376 printk(KERN_DEBUG "High memory: %luk\n", 377 totalhigh_pages << (PAGE_SHIFT-10)); 378 } 379 #endif /* CONFIG_HIGHMEM */ 380 381 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " 382 "%luk reserved, %luk data, %luk bss, %luk init)\n", 383 nr_free_pages() << (PAGE_SHIFT-10), 384 num_physpages << (PAGE_SHIFT-10), 385 codesize >> 10, 386 reservedpages << (PAGE_SHIFT-10), 387 datasize >> 10, 388 bsssize >> 10, 389 initsize >> 10); 390 391 #ifdef CONFIG_PPC32 392 pr_info("Kernel virtual memory layout:\n"); 393 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); 394 #ifdef CONFIG_HIGHMEM 395 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", 396 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); 397 #endif /* CONFIG_HIGHMEM */ 398 #ifdef CONFIG_NOT_COHERENT_CACHE 399 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", 400 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); 401 #endif /* CONFIG_NOT_COHERENT_CACHE */ 402 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", 403 ioremap_bot, IOREMAP_TOP); 404 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", 405 VMALLOC_START, VMALLOC_END); 406 #endif /* CONFIG_PPC32 */ 407 408 mem_init_done = 1; 409 } 410 411 /* 412 * This is called when a page has been modified by the kernel. 413 * It just marks the page as not i-cache clean. We do the i-cache 414 * flush later when the page is given to a user process, if necessary. 415 */ 416 void flush_dcache_page(struct page *page) 417 { 418 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) 419 return; 420 /* avoid an atomic op if possible */ 421 if (test_bit(PG_arch_1, &page->flags)) 422 clear_bit(PG_arch_1, &page->flags); 423 } 424 EXPORT_SYMBOL(flush_dcache_page); 425 426 void flush_dcache_icache_page(struct page *page) 427 { 428 #ifdef CONFIG_HUGETLB_PAGE 429 if (PageCompound(page)) { 430 flush_dcache_icache_hugepage(page); 431 return; 432 } 433 #endif 434 #ifdef CONFIG_BOOKE 435 { 436 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); 437 __flush_dcache_icache(start); 438 kunmap_atomic(start, KM_PPC_SYNC_ICACHE); 439 } 440 #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) 441 /* On 8xx there is no need to kmap since highmem is not supported */ 442 __flush_dcache_icache(page_address(page)); 443 #else 444 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); 445 #endif 446 } 447 448 void clear_user_page(void *page, unsigned long vaddr, struct page *pg) 449 { 450 clear_page(page); 451 452 /* 453 * We shouldnt have to do this, but some versions of glibc 454 * require it (ld.so assumes zero filled pages are icache clean) 455 * - Anton 456 */ 457 flush_dcache_page(pg); 458 } 459 EXPORT_SYMBOL(clear_user_page); 460 461 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 462 struct page *pg) 463 { 464 copy_page(vto, vfrom); 465 466 /* 467 * We should be able to use the following optimisation, however 468 * there are two problems. 469 * Firstly a bug in some versions of binutils meant PLT sections 470 * were not marked executable. 471 * Secondly the first word in the GOT section is blrl, used 472 * to establish the GOT address. Until recently the GOT was 473 * not marked executable. 474 * - Anton 475 */ 476 #if 0 477 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) 478 return; 479 #endif 480 481 flush_dcache_page(pg); 482 } 483 484 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, 485 unsigned long addr, int len) 486 { 487 unsigned long maddr; 488 489 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); 490 flush_icache_range(maddr, maddr + len); 491 kunmap(page); 492 } 493 EXPORT_SYMBOL(flush_icache_user_range); 494 495 /* 496 * This is called at the end of handling a user page fault, when the 497 * fault has been handled by updating a PTE in the linux page tables. 498 * We use it to preload an HPTE into the hash table corresponding to 499 * the updated linux PTE. 500 * 501 * This must always be called with the pte lock held. 502 */ 503 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, 504 pte_t *ptep) 505 { 506 #ifdef CONFIG_PPC_STD_MMU 507 unsigned long access = 0, trap; 508 509 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ 510 if (!pte_young(*ptep) || address >= TASK_SIZE) 511 return; 512 513 /* We try to figure out if we are coming from an instruction 514 * access fault and pass that down to __hash_page so we avoid 515 * double-faulting on execution of fresh text. We have to test 516 * for regs NULL since init will get here first thing at boot 517 * 518 * We also avoid filling the hash if not coming from a fault 519 */ 520 if (current->thread.regs == NULL) 521 return; 522 trap = TRAP(current->thread.regs); 523 if (trap == 0x400) 524 access |= _PAGE_EXEC; 525 else if (trap != 0x300) 526 return; 527 hash_preload(vma->vm_mm, address, access, trap); 528 #endif /* CONFIG_PPC_STD_MMU */ 529 } 530