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/export.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 struct memblock_region *reg; 86 87 for_each_memblock(memory, reg) 88 if (paddr >= reg->base && paddr < (reg->base + reg->size)) 89 return 1; 90 return 0; 91 #endif 92 } 93 94 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 95 unsigned long size, pgprot_t vma_prot) 96 { 97 if (ppc_md.phys_mem_access_prot) 98 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); 99 100 if (!page_is_ram(pfn)) 101 vma_prot = pgprot_noncached(vma_prot); 102 103 return vma_prot; 104 } 105 EXPORT_SYMBOL(phys_mem_access_prot); 106 107 #ifdef CONFIG_MEMORY_HOTPLUG 108 109 #ifdef CONFIG_NUMA 110 int memory_add_physaddr_to_nid(u64 start) 111 { 112 return hot_add_scn_to_nid(start); 113 } 114 #endif 115 116 int arch_add_memory(int nid, u64 start, u64 size) 117 { 118 struct pglist_data *pgdata; 119 struct zone *zone; 120 unsigned long start_pfn = start >> PAGE_SHIFT; 121 unsigned long nr_pages = size >> PAGE_SHIFT; 122 123 pgdata = NODE_DATA(nid); 124 125 start = (unsigned long)__va(start); 126 if (create_section_mapping(start, start + size)) 127 return -EINVAL; 128 129 /* this should work for most non-highmem platforms */ 130 zone = pgdata->node_zones; 131 132 return __add_pages(nid, zone, start_pfn, nr_pages); 133 } 134 #endif /* CONFIG_MEMORY_HOTPLUG */ 135 136 /* 137 * walk_memory_resource() needs to make sure there is no holes in a given 138 * memory range. PPC64 does not maintain the memory layout in /proc/iomem. 139 * Instead it maintains it in memblock.memory structures. Walk through the 140 * memory regions, find holes and callback for contiguous regions. 141 */ 142 int 143 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, 144 void *arg, int (*func)(unsigned long, unsigned long, void *)) 145 { 146 struct memblock_region *reg; 147 unsigned long end_pfn = start_pfn + nr_pages; 148 unsigned long tstart, tend; 149 int ret = -1; 150 151 for_each_memblock(memory, reg) { 152 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); 153 tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); 154 if (tstart >= tend) 155 continue; 156 ret = (*func)(tstart, tend - tstart, arg); 157 if (ret) 158 break; 159 } 160 return ret; 161 } 162 EXPORT_SYMBOL_GPL(walk_system_ram_range); 163 164 /* 165 * Initialize the bootmem system and give it all the memory we 166 * have available. If we are using highmem, we only put the 167 * lowmem into the bootmem system. 168 */ 169 #ifndef CONFIG_NEED_MULTIPLE_NODES 170 void __init do_init_bootmem(void) 171 { 172 unsigned long start, bootmap_pages; 173 unsigned long total_pages; 174 struct memblock_region *reg; 175 int boot_mapsize; 176 177 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 178 total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; 179 #ifdef CONFIG_HIGHMEM 180 total_pages = total_lowmem >> PAGE_SHIFT; 181 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; 182 #endif 183 184 /* 185 * Find an area to use for the bootmem bitmap. Calculate the size of 186 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. 187 * Add 1 additional page in case the address isn't page-aligned. 188 */ 189 bootmap_pages = bootmem_bootmap_pages(total_pages); 190 191 start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); 192 193 min_low_pfn = MEMORY_START >> PAGE_SHIFT; 194 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); 195 196 /* Add active regions with valid PFNs */ 197 for_each_memblock(memory, reg) { 198 unsigned long start_pfn, end_pfn; 199 start_pfn = memblock_region_memory_base_pfn(reg); 200 end_pfn = memblock_region_memory_end_pfn(reg); 201 add_active_range(0, start_pfn, end_pfn); 202 } 203 204 /* Add all physical memory to the bootmem map, mark each area 205 * present. 206 */ 207 #ifdef CONFIG_HIGHMEM 208 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); 209 210 /* reserve the sections we're already using */ 211 for_each_memblock(reserved, reg) { 212 unsigned long top = reg->base + reg->size - 1; 213 if (top < lowmem_end_addr) 214 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); 215 else if (reg->base < lowmem_end_addr) { 216 unsigned long trunc_size = lowmem_end_addr - reg->base; 217 reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT); 218 } 219 } 220 #else 221 free_bootmem_with_active_regions(0, max_pfn); 222 223 /* reserve the sections we're already using */ 224 for_each_memblock(reserved, reg) 225 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); 226 #endif 227 /* XXX need to clip this if using highmem? */ 228 sparse_memory_present_with_active_regions(0); 229 230 init_bootmem_done = 1; 231 } 232 233 /* mark pages that don't exist as nosave */ 234 static int __init mark_nonram_nosave(void) 235 { 236 struct memblock_region *reg, *prev = NULL; 237 238 for_each_memblock(memory, reg) { 239 if (prev && 240 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) 241 register_nosave_region(memblock_region_memory_end_pfn(prev), 242 memblock_region_memory_base_pfn(reg)); 243 prev = reg; 244 } 245 return 0; 246 } 247 248 /* 249 * paging_init() sets up the page tables - in fact we've already done this. 250 */ 251 void __init paging_init(void) 252 { 253 unsigned long long total_ram = memblock_phys_mem_size(); 254 phys_addr_t top_of_ram = memblock_end_of_DRAM(); 255 unsigned long max_zone_pfns[MAX_NR_ZONES]; 256 257 #ifdef CONFIG_PPC32 258 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); 259 unsigned long end = __fix_to_virt(FIX_HOLE); 260 261 for (; v < end; v += PAGE_SIZE) 262 map_page(v, 0, 0); /* XXX gross */ 263 #endif 264 265 #ifdef CONFIG_HIGHMEM 266 map_page(PKMAP_BASE, 0, 0); /* XXX gross */ 267 pkmap_page_table = virt_to_kpte(PKMAP_BASE); 268 269 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); 270 kmap_prot = PAGE_KERNEL; 271 #endif /* CONFIG_HIGHMEM */ 272 273 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", 274 (unsigned long long)top_of_ram, total_ram); 275 printk(KERN_DEBUG "Memory hole size: %ldMB\n", 276 (long int)((top_of_ram - total_ram) >> 20)); 277 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 278 #ifdef CONFIG_HIGHMEM 279 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; 280 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; 281 #else 282 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; 283 #endif 284 free_area_init_nodes(max_zone_pfns); 285 286 mark_nonram_nosave(); 287 } 288 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ 289 290 void __init mem_init(void) 291 { 292 #ifdef CONFIG_NEED_MULTIPLE_NODES 293 int nid; 294 #endif 295 pg_data_t *pgdat; 296 unsigned long i; 297 struct page *page; 298 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; 299 300 #ifdef CONFIG_SWIOTLB 301 if (ppc_swiotlb_enable) 302 swiotlb_init(1); 303 #endif 304 305 num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT; 306 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 307 308 #ifdef CONFIG_NEED_MULTIPLE_NODES 309 for_each_online_node(nid) { 310 if (NODE_DATA(nid)->node_spanned_pages != 0) { 311 printk("freeing bootmem node %d\n", nid); 312 totalram_pages += 313 free_all_bootmem_node(NODE_DATA(nid)); 314 } 315 } 316 #else 317 max_mapnr = max_pfn; 318 totalram_pages += free_all_bootmem(); 319 #endif 320 for_each_online_pgdat(pgdat) { 321 for (i = 0; i < pgdat->node_spanned_pages; i++) { 322 if (!pfn_valid(pgdat->node_start_pfn + i)) 323 continue; 324 page = pgdat_page_nr(pgdat, i); 325 if (PageReserved(page)) 326 reservedpages++; 327 } 328 } 329 330 codesize = (unsigned long)&_sdata - (unsigned long)&_stext; 331 datasize = (unsigned long)&_edata - (unsigned long)&_sdata; 332 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; 333 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; 334 335 #ifdef CONFIG_HIGHMEM 336 { 337 unsigned long pfn, highmem_mapnr; 338 339 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; 340 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { 341 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; 342 struct page *page = pfn_to_page(pfn); 343 if (memblock_is_reserved(paddr)) 344 continue; 345 ClearPageReserved(page); 346 init_page_count(page); 347 __free_page(page); 348 totalhigh_pages++; 349 reservedpages--; 350 } 351 totalram_pages += totalhigh_pages; 352 printk(KERN_DEBUG "High memory: %luk\n", 353 totalhigh_pages << (PAGE_SHIFT-10)); 354 } 355 #endif /* CONFIG_HIGHMEM */ 356 357 #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) 358 /* 359 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up 360 * functions.... do it here for the non-smp case. 361 */ 362 per_cpu(next_tlbcam_idx, smp_processor_id()) = 363 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; 364 #endif 365 366 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " 367 "%luk reserved, %luk data, %luk bss, %luk init)\n", 368 nr_free_pages() << (PAGE_SHIFT-10), 369 num_physpages << (PAGE_SHIFT-10), 370 codesize >> 10, 371 reservedpages << (PAGE_SHIFT-10), 372 datasize >> 10, 373 bsssize >> 10, 374 initsize >> 10); 375 376 #ifdef CONFIG_PPC32 377 pr_info("Kernel virtual memory layout:\n"); 378 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); 379 #ifdef CONFIG_HIGHMEM 380 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", 381 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); 382 #endif /* CONFIG_HIGHMEM */ 383 #ifdef CONFIG_NOT_COHERENT_CACHE 384 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", 385 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); 386 #endif /* CONFIG_NOT_COHERENT_CACHE */ 387 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", 388 ioremap_bot, IOREMAP_TOP); 389 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", 390 VMALLOC_START, VMALLOC_END); 391 #endif /* CONFIG_PPC32 */ 392 393 mem_init_done = 1; 394 } 395 396 void free_initmem(void) 397 { 398 unsigned long addr; 399 400 ppc_md.progress = ppc_printk_progress; 401 402 addr = (unsigned long)__init_begin; 403 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { 404 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); 405 ClearPageReserved(virt_to_page(addr)); 406 init_page_count(virt_to_page(addr)); 407 free_page(addr); 408 totalram_pages++; 409 } 410 pr_info("Freeing unused kernel memory: %luk freed\n", 411 ((unsigned long)__init_end - 412 (unsigned long)__init_begin) >> 10); 413 } 414 415 #ifdef CONFIG_BLK_DEV_INITRD 416 void __init free_initrd_mem(unsigned long start, unsigned long end) 417 { 418 if (start >= end) 419 return; 420 421 start = _ALIGN_DOWN(start, PAGE_SIZE); 422 end = _ALIGN_UP(end, PAGE_SIZE); 423 pr_info("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 424 425 for (; start < end; start += PAGE_SIZE) { 426 ClearPageReserved(virt_to_page(start)); 427 init_page_count(virt_to_page(start)); 428 free_page(start); 429 totalram_pages++; 430 } 431 } 432 #endif 433 434 /* 435 * This is called when a page has been modified by the kernel. 436 * It just marks the page as not i-cache clean. We do the i-cache 437 * flush later when the page is given to a user process, if necessary. 438 */ 439 void flush_dcache_page(struct page *page) 440 { 441 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) 442 return; 443 /* avoid an atomic op if possible */ 444 if (test_bit(PG_arch_1, &page->flags)) 445 clear_bit(PG_arch_1, &page->flags); 446 } 447 EXPORT_SYMBOL(flush_dcache_page); 448 449 void flush_dcache_icache_page(struct page *page) 450 { 451 #ifdef CONFIG_HUGETLB_PAGE 452 if (PageCompound(page)) { 453 flush_dcache_icache_hugepage(page); 454 return; 455 } 456 #endif 457 #ifdef CONFIG_BOOKE 458 { 459 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); 460 __flush_dcache_icache(start); 461 kunmap_atomic(start, KM_PPC_SYNC_ICACHE); 462 } 463 #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) 464 /* On 8xx there is no need to kmap since highmem is not supported */ 465 __flush_dcache_icache(page_address(page)); 466 #else 467 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); 468 #endif 469 } 470 471 void clear_user_page(void *page, unsigned long vaddr, struct page *pg) 472 { 473 clear_page(page); 474 475 /* 476 * We shouldn't have to do this, but some versions of glibc 477 * require it (ld.so assumes zero filled pages are icache clean) 478 * - Anton 479 */ 480 flush_dcache_page(pg); 481 } 482 EXPORT_SYMBOL(clear_user_page); 483 484 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 485 struct page *pg) 486 { 487 copy_page(vto, vfrom); 488 489 /* 490 * We should be able to use the following optimisation, however 491 * there are two problems. 492 * Firstly a bug in some versions of binutils meant PLT sections 493 * were not marked executable. 494 * Secondly the first word in the GOT section is blrl, used 495 * to establish the GOT address. Until recently the GOT was 496 * not marked executable. 497 * - Anton 498 */ 499 #if 0 500 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) 501 return; 502 #endif 503 504 flush_dcache_page(pg); 505 } 506 507 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, 508 unsigned long addr, int len) 509 { 510 unsigned long maddr; 511 512 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); 513 flush_icache_range(maddr, maddr + len); 514 kunmap(page); 515 } 516 EXPORT_SYMBOL(flush_icache_user_range); 517 518 /* 519 * This is called at the end of handling a user page fault, when the 520 * fault has been handled by updating a PTE in the linux page tables. 521 * We use it to preload an HPTE into the hash table corresponding to 522 * the updated linux PTE. 523 * 524 * This must always be called with the pte lock held. 525 */ 526 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, 527 pte_t *ptep) 528 { 529 #ifdef CONFIG_PPC_STD_MMU 530 unsigned long access = 0, trap; 531 532 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ 533 if (!pte_young(*ptep) || address >= TASK_SIZE) 534 return; 535 536 /* We try to figure out if we are coming from an instruction 537 * access fault and pass that down to __hash_page so we avoid 538 * double-faulting on execution of fresh text. We have to test 539 * for regs NULL since init will get here first thing at boot 540 * 541 * We also avoid filling the hash if not coming from a fault 542 */ 543 if (current->thread.regs == NULL) 544 return; 545 trap = TRAP(current->thread.regs); 546 if (trap == 0x400) 547 access |= _PAGE_EXEC; 548 else if (trap != 0x300) 549 return; 550 hash_preload(vma->vm_mm, address, access, trap); 551 #endif /* CONFIG_PPC_STD_MMU */ 552 #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \ 553 && defined(CONFIG_HUGETLB_PAGE) 554 if (is_vm_hugetlb_page(vma)) 555 book3e_hugetlb_preload(vma->vm_mm, address, *ptep); 556 #endif 557 } 558