1 /* 2 * linux/arch/parisc/mm/init.c 3 * 4 * Copyright (C) 1995 Linus Torvalds 5 * Copyright 1999 SuSE GmbH 6 * changed by Philipp Rumpf 7 * Copyright 1999 Philipp Rumpf (prumpf@tux.org) 8 * Copyright 2004 Randolph Chung (tausq@debian.org) 9 * Copyright 2006 Helge Deller (deller@gmx.de) 10 * 11 */ 12 13 14 #include <linux/module.h> 15 #include <linux/mm.h> 16 #include <linux/bootmem.h> 17 #include <linux/delay.h> 18 #include <linux/init.h> 19 #include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */ 20 #include <linux/initrd.h> 21 #include <linux/swap.h> 22 #include <linux/unistd.h> 23 #include <linux/nodemask.h> /* for node_online_map */ 24 #include <linux/pagemap.h> /* for release_pages and page_cache_release */ 25 26 #include <asm/pgalloc.h> 27 #include <asm/tlb.h> 28 #include <asm/pdc_chassis.h> 29 #include <asm/mmzone.h> 30 #include <asm/sections.h> 31 32 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 33 34 extern int data_start; 35 36 #ifdef CONFIG_DISCONTIGMEM 37 struct node_map_data node_data[MAX_NUMNODES] __read_mostly; 38 bootmem_data_t bmem_data[MAX_NUMNODES] __read_mostly; 39 unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly; 40 #endif 41 42 static struct resource data_resource = { 43 .name = "Kernel data", 44 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 45 }; 46 47 static struct resource code_resource = { 48 .name = "Kernel code", 49 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 50 }; 51 52 static struct resource pdcdata_resource = { 53 .name = "PDC data (Page Zero)", 54 .start = 0, 55 .end = 0x9ff, 56 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 57 }; 58 59 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly; 60 61 /* The following array is initialized from the firmware specific 62 * information retrieved in kernel/inventory.c. 63 */ 64 65 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly; 66 int npmem_ranges __read_mostly; 67 68 #ifdef __LP64__ 69 #define MAX_MEM (~0UL) 70 #else /* !__LP64__ */ 71 #define MAX_MEM (3584U*1024U*1024U) 72 #endif /* !__LP64__ */ 73 74 static unsigned long mem_limit __read_mostly = MAX_MEM; 75 76 static void __init mem_limit_func(void) 77 { 78 char *cp, *end; 79 unsigned long limit; 80 81 /* We need this before __setup() functions are called */ 82 83 limit = MAX_MEM; 84 for (cp = boot_command_line; *cp; ) { 85 if (memcmp(cp, "mem=", 4) == 0) { 86 cp += 4; 87 limit = memparse(cp, &end); 88 if (end != cp) 89 break; 90 cp = end; 91 } else { 92 while (*cp != ' ' && *cp) 93 ++cp; 94 while (*cp == ' ') 95 ++cp; 96 } 97 } 98 99 if (limit < mem_limit) 100 mem_limit = limit; 101 } 102 103 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT) 104 105 static void __init setup_bootmem(void) 106 { 107 unsigned long bootmap_size; 108 unsigned long mem_max; 109 unsigned long bootmap_pages; 110 unsigned long bootmap_start_pfn; 111 unsigned long bootmap_pfn; 112 #ifndef CONFIG_DISCONTIGMEM 113 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; 114 int npmem_holes; 115 #endif 116 int i, sysram_resource_count; 117 118 disable_sr_hashing(); /* Turn off space register hashing */ 119 120 /* 121 * Sort the ranges. Since the number of ranges is typically 122 * small, and performance is not an issue here, just do 123 * a simple insertion sort. 124 */ 125 126 for (i = 1; i < npmem_ranges; i++) { 127 int j; 128 129 for (j = i; j > 0; j--) { 130 unsigned long tmp; 131 132 if (pmem_ranges[j-1].start_pfn < 133 pmem_ranges[j].start_pfn) { 134 135 break; 136 } 137 tmp = pmem_ranges[j-1].start_pfn; 138 pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn; 139 pmem_ranges[j].start_pfn = tmp; 140 tmp = pmem_ranges[j-1].pages; 141 pmem_ranges[j-1].pages = pmem_ranges[j].pages; 142 pmem_ranges[j].pages = tmp; 143 } 144 } 145 146 #ifndef CONFIG_DISCONTIGMEM 147 /* 148 * Throw out ranges that are too far apart (controlled by 149 * MAX_GAP). 150 */ 151 152 for (i = 1; i < npmem_ranges; i++) { 153 if (pmem_ranges[i].start_pfn - 154 (pmem_ranges[i-1].start_pfn + 155 pmem_ranges[i-1].pages) > MAX_GAP) { 156 npmem_ranges = i; 157 printk("Large gap in memory detected (%ld pages). " 158 "Consider turning on CONFIG_DISCONTIGMEM\n", 159 pmem_ranges[i].start_pfn - 160 (pmem_ranges[i-1].start_pfn + 161 pmem_ranges[i-1].pages)); 162 break; 163 } 164 } 165 #endif 166 167 if (npmem_ranges > 1) { 168 169 /* Print the memory ranges */ 170 171 printk(KERN_INFO "Memory Ranges:\n"); 172 173 for (i = 0; i < npmem_ranges; i++) { 174 unsigned long start; 175 unsigned long size; 176 177 size = (pmem_ranges[i].pages << PAGE_SHIFT); 178 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); 179 printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", 180 i,start, start + (size - 1), size >> 20); 181 } 182 } 183 184 sysram_resource_count = npmem_ranges; 185 for (i = 0; i < sysram_resource_count; i++) { 186 struct resource *res = &sysram_resources[i]; 187 res->name = "System RAM"; 188 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT; 189 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1; 190 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 191 request_resource(&iomem_resource, res); 192 } 193 194 /* 195 * For 32 bit kernels we limit the amount of memory we can 196 * support, in order to preserve enough kernel address space 197 * for other purposes. For 64 bit kernels we don't normally 198 * limit the memory, but this mechanism can be used to 199 * artificially limit the amount of memory (and it is written 200 * to work with multiple memory ranges). 201 */ 202 203 mem_limit_func(); /* check for "mem=" argument */ 204 205 mem_max = 0; 206 num_physpages = 0; 207 for (i = 0; i < npmem_ranges; i++) { 208 unsigned long rsize; 209 210 rsize = pmem_ranges[i].pages << PAGE_SHIFT; 211 if ((mem_max + rsize) > mem_limit) { 212 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); 213 if (mem_max == mem_limit) 214 npmem_ranges = i; 215 else { 216 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) 217 - (mem_max >> PAGE_SHIFT); 218 npmem_ranges = i + 1; 219 mem_max = mem_limit; 220 } 221 num_physpages += pmem_ranges[i].pages; 222 break; 223 } 224 num_physpages += pmem_ranges[i].pages; 225 mem_max += rsize; 226 } 227 228 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); 229 230 #ifndef CONFIG_DISCONTIGMEM 231 /* Merge the ranges, keeping track of the holes */ 232 233 { 234 unsigned long end_pfn; 235 unsigned long hole_pages; 236 237 npmem_holes = 0; 238 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; 239 for (i = 1; i < npmem_ranges; i++) { 240 241 hole_pages = pmem_ranges[i].start_pfn - end_pfn; 242 if (hole_pages) { 243 pmem_holes[npmem_holes].start_pfn = end_pfn; 244 pmem_holes[npmem_holes++].pages = hole_pages; 245 end_pfn += hole_pages; 246 } 247 end_pfn += pmem_ranges[i].pages; 248 } 249 250 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; 251 npmem_ranges = 1; 252 } 253 #endif 254 255 bootmap_pages = 0; 256 for (i = 0; i < npmem_ranges; i++) 257 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages); 258 259 bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT; 260 261 #ifdef CONFIG_DISCONTIGMEM 262 for (i = 0; i < MAX_PHYSMEM_RANGES; i++) { 263 memset(NODE_DATA(i), 0, sizeof(pg_data_t)); 264 NODE_DATA(i)->bdata = &bmem_data[i]; 265 } 266 memset(pfnnid_map, 0xff, sizeof(pfnnid_map)); 267 268 for (i = 0; i < npmem_ranges; i++) 269 node_set_online(i); 270 #endif 271 272 /* 273 * Initialize and free the full range of memory in each range. 274 * Note that the only writing these routines do are to the bootmap, 275 * and we've made sure to locate the bootmap properly so that they 276 * won't be writing over anything important. 277 */ 278 279 bootmap_pfn = bootmap_start_pfn; 280 max_pfn = 0; 281 for (i = 0; i < npmem_ranges; i++) { 282 unsigned long start_pfn; 283 unsigned long npages; 284 285 start_pfn = pmem_ranges[i].start_pfn; 286 npages = pmem_ranges[i].pages; 287 288 bootmap_size = init_bootmem_node(NODE_DATA(i), 289 bootmap_pfn, 290 start_pfn, 291 (start_pfn + npages) ); 292 free_bootmem_node(NODE_DATA(i), 293 (start_pfn << PAGE_SHIFT), 294 (npages << PAGE_SHIFT) ); 295 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT; 296 if ((start_pfn + npages) > max_pfn) 297 max_pfn = start_pfn + npages; 298 } 299 300 /* IOMMU is always used to access "high mem" on those boxes 301 * that can support enough mem that a PCI device couldn't 302 * directly DMA to any physical addresses. 303 * ISA DMA support will need to revisit this. 304 */ 305 max_low_pfn = max_pfn; 306 307 if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) { 308 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n"); 309 BUG(); 310 } 311 312 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ 313 314 #define PDC_CONSOLE_IO_IODC_SIZE 32768 315 316 reserve_bootmem_node(NODE_DATA(0), 0UL, 317 (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE)); 318 reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text), 319 (unsigned long)(_end - _text)); 320 reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT), 321 ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT)); 322 323 #ifndef CONFIG_DISCONTIGMEM 324 325 /* reserve the holes */ 326 327 for (i = 0; i < npmem_holes; i++) { 328 reserve_bootmem_node(NODE_DATA(0), 329 (pmem_holes[i].start_pfn << PAGE_SHIFT), 330 (pmem_holes[i].pages << PAGE_SHIFT)); 331 } 332 #endif 333 334 #ifdef CONFIG_BLK_DEV_INITRD 335 if (initrd_start) { 336 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); 337 if (__pa(initrd_start) < mem_max) { 338 unsigned long initrd_reserve; 339 340 if (__pa(initrd_end) > mem_max) { 341 initrd_reserve = mem_max - __pa(initrd_start); 342 } else { 343 initrd_reserve = initrd_end - initrd_start; 344 } 345 initrd_below_start_ok = 1; 346 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); 347 348 reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve); 349 } 350 } 351 #endif 352 353 data_resource.start = virt_to_phys(&data_start); 354 data_resource.end = virt_to_phys(_end) - 1; 355 code_resource.start = virt_to_phys(_text); 356 code_resource.end = virt_to_phys(&data_start)-1; 357 358 /* We don't know which region the kernel will be in, so try 359 * all of them. 360 */ 361 for (i = 0; i < sysram_resource_count; i++) { 362 struct resource *res = &sysram_resources[i]; 363 request_resource(res, &code_resource); 364 request_resource(res, &data_resource); 365 } 366 request_resource(&sysram_resources[0], &pdcdata_resource); 367 } 368 369 void free_initmem(void) 370 { 371 unsigned long addr, init_begin, init_end; 372 373 printk(KERN_INFO "Freeing unused kernel memory: "); 374 375 #ifdef CONFIG_DEBUG_KERNEL 376 /* Attempt to catch anyone trying to execute code here 377 * by filling the page with BRK insns. 378 * 379 * If we disable interrupts for all CPUs, then IPI stops working. 380 * Kinda breaks the global cache flushing. 381 */ 382 local_irq_disable(); 383 384 memset(__init_begin, 0x00, 385 (unsigned long)__init_end - (unsigned long)__init_begin); 386 387 flush_data_cache(); 388 asm volatile("sync" : : ); 389 flush_icache_range((unsigned long)__init_begin, (unsigned long)__init_end); 390 asm volatile("sync" : : ); 391 392 local_irq_enable(); 393 #endif 394 395 /* align __init_begin and __init_end to page size, 396 ignoring linker script where we might have tried to save RAM */ 397 init_begin = PAGE_ALIGN((unsigned long)(__init_begin)); 398 init_end = PAGE_ALIGN((unsigned long)(__init_end)); 399 for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) { 400 ClearPageReserved(virt_to_page(addr)); 401 init_page_count(virt_to_page(addr)); 402 free_page(addr); 403 num_physpages++; 404 totalram_pages++; 405 } 406 407 /* set up a new led state on systems shipped LED State panel */ 408 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); 409 410 printk("%luk freed\n", (init_end - init_begin) >> 10); 411 } 412 413 414 #ifdef CONFIG_DEBUG_RODATA 415 void mark_rodata_ro(void) 416 { 417 /* rodata memory was already mapped with KERNEL_RO access rights by 418 pagetable_init() and map_pages(). No need to do additional stuff here */ 419 printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n", 420 (unsigned long)(__end_rodata - __start_rodata) >> 10); 421 } 422 #endif 423 424 425 /* 426 * Just an arbitrary offset to serve as a "hole" between mapping areas 427 * (between top of physical memory and a potential pcxl dma mapping 428 * area, and below the vmalloc mapping area). 429 * 430 * The current 32K value just means that there will be a 32K "hole" 431 * between mapping areas. That means that any out-of-bounds memory 432 * accesses will hopefully be caught. The vmalloc() routines leaves 433 * a hole of 4kB between each vmalloced area for the same reason. 434 */ 435 436 /* Leave room for gateway page expansion */ 437 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE 438 #error KERNEL_MAP_START is in gateway reserved region 439 #endif 440 #define MAP_START (KERNEL_MAP_START) 441 442 #define VM_MAP_OFFSET (32*1024) 443 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ 444 & ~(VM_MAP_OFFSET-1))) 445 446 void *vmalloc_start __read_mostly; 447 EXPORT_SYMBOL(vmalloc_start); 448 449 #ifdef CONFIG_PA11 450 unsigned long pcxl_dma_start __read_mostly; 451 #endif 452 453 void __init mem_init(void) 454 { 455 high_memory = __va((max_pfn << PAGE_SHIFT)); 456 457 #ifndef CONFIG_DISCONTIGMEM 458 max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1; 459 totalram_pages += free_all_bootmem(); 460 #else 461 { 462 int i; 463 464 for (i = 0; i < npmem_ranges; i++) 465 totalram_pages += free_all_bootmem_node(NODE_DATA(i)); 466 } 467 #endif 468 469 printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10)); 470 471 #ifdef CONFIG_PA11 472 if (hppa_dma_ops == &pcxl_dma_ops) { 473 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); 474 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE); 475 } else { 476 pcxl_dma_start = 0; 477 vmalloc_start = SET_MAP_OFFSET(MAP_START); 478 } 479 #else 480 vmalloc_start = SET_MAP_OFFSET(MAP_START); 481 #endif 482 483 } 484 485 unsigned long *empty_zero_page __read_mostly; 486 487 void show_mem(void) 488 { 489 int i,free = 0,total = 0,reserved = 0; 490 int shared = 0, cached = 0; 491 492 printk(KERN_INFO "Mem-info:\n"); 493 show_free_areas(); 494 printk(KERN_INFO "Free swap: %6ldkB\n", 495 nr_swap_pages<<(PAGE_SHIFT-10)); 496 #ifndef CONFIG_DISCONTIGMEM 497 i = max_mapnr; 498 while (i-- > 0) { 499 total++; 500 if (PageReserved(mem_map+i)) 501 reserved++; 502 else if (PageSwapCache(mem_map+i)) 503 cached++; 504 else if (!page_count(&mem_map[i])) 505 free++; 506 else 507 shared += page_count(&mem_map[i]) - 1; 508 } 509 #else 510 for (i = 0; i < npmem_ranges; i++) { 511 int j; 512 513 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) { 514 struct page *p; 515 unsigned long flags; 516 517 pgdat_resize_lock(NODE_DATA(i), &flags); 518 p = nid_page_nr(i, j) - node_start_pfn(i); 519 520 total++; 521 if (PageReserved(p)) 522 reserved++; 523 else if (PageSwapCache(p)) 524 cached++; 525 else if (!page_count(p)) 526 free++; 527 else 528 shared += page_count(p) - 1; 529 pgdat_resize_unlock(NODE_DATA(i), &flags); 530 } 531 } 532 #endif 533 printk(KERN_INFO "%d pages of RAM\n", total); 534 printk(KERN_INFO "%d reserved pages\n", reserved); 535 printk(KERN_INFO "%d pages shared\n", shared); 536 printk(KERN_INFO "%d pages swap cached\n", cached); 537 538 539 #ifdef CONFIG_DISCONTIGMEM 540 { 541 struct zonelist *zl; 542 int i, j, k; 543 544 for (i = 0; i < npmem_ranges; i++) { 545 for (j = 0; j < MAX_NR_ZONES; j++) { 546 zl = NODE_DATA(i)->node_zonelists + j; 547 548 printk("Zone list for zone %d on node %d: ", j, i); 549 for (k = 0; zl->zones[k] != NULL; k++) 550 printk("[%d/%s] ", zone_to_nid(zl->zones[k]), zl->zones[k]->name); 551 printk("\n"); 552 } 553 } 554 } 555 #endif 556 } 557 558 559 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot) 560 { 561 pgd_t *pg_dir; 562 pmd_t *pmd; 563 pte_t *pg_table; 564 unsigned long end_paddr; 565 unsigned long start_pmd; 566 unsigned long start_pte; 567 unsigned long tmp1; 568 unsigned long tmp2; 569 unsigned long address; 570 unsigned long ro_start; 571 unsigned long ro_end; 572 unsigned long fv_addr; 573 unsigned long gw_addr; 574 extern const unsigned long fault_vector_20; 575 extern void * const linux_gateway_page; 576 577 ro_start = __pa((unsigned long)_text); 578 ro_end = __pa((unsigned long)&data_start); 579 fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK; 580 gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK; 581 582 end_paddr = start_paddr + size; 583 584 pg_dir = pgd_offset_k(start_vaddr); 585 586 #if PTRS_PER_PMD == 1 587 start_pmd = 0; 588 #else 589 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); 590 #endif 591 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 592 593 address = start_paddr; 594 while (address < end_paddr) { 595 #if PTRS_PER_PMD == 1 596 pmd = (pmd_t *)__pa(pg_dir); 597 #else 598 pmd = (pmd_t *)pgd_address(*pg_dir); 599 600 /* 601 * pmd is physical at this point 602 */ 603 604 if (!pmd) { 605 pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER); 606 pmd = (pmd_t *) __pa(pmd); 607 } 608 609 pgd_populate(NULL, pg_dir, __va(pmd)); 610 #endif 611 pg_dir++; 612 613 /* now change pmd to kernel virtual addresses */ 614 615 pmd = (pmd_t *)__va(pmd) + start_pmd; 616 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) { 617 618 /* 619 * pg_table is physical at this point 620 */ 621 622 pg_table = (pte_t *)pmd_address(*pmd); 623 if (!pg_table) { 624 pg_table = (pte_t *) 625 alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE); 626 pg_table = (pte_t *) __pa(pg_table); 627 } 628 629 pmd_populate_kernel(NULL, pmd, __va(pg_table)); 630 631 /* now change pg_table to kernel virtual addresses */ 632 633 pg_table = (pte_t *) __va(pg_table) + start_pte; 634 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) { 635 pte_t pte; 636 637 /* 638 * Map the fault vector writable so we can 639 * write the HPMC checksum. 640 */ 641 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) 642 if (address >= ro_start && address < ro_end 643 && address != fv_addr 644 && address != gw_addr) 645 pte = __mk_pte(address, PAGE_KERNEL_RO); 646 else 647 #endif 648 pte = __mk_pte(address, pgprot); 649 650 if (address >= end_paddr) 651 pte_val(pte) = 0; 652 653 set_pte(pg_table, pte); 654 655 address += PAGE_SIZE; 656 } 657 start_pte = 0; 658 659 if (address >= end_paddr) 660 break; 661 } 662 start_pmd = 0; 663 } 664 } 665 666 /* 667 * pagetable_init() sets up the page tables 668 * 669 * Note that gateway_init() places the Linux gateway page at page 0. 670 * Since gateway pages cannot be dereferenced this has the desirable 671 * side effect of trapping those pesky NULL-reference errors in the 672 * kernel. 673 */ 674 static void __init pagetable_init(void) 675 { 676 int range; 677 678 /* Map each physical memory range to its kernel vaddr */ 679 680 for (range = 0; range < npmem_ranges; range++) { 681 unsigned long start_paddr; 682 unsigned long end_paddr; 683 unsigned long size; 684 685 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; 686 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT); 687 size = pmem_ranges[range].pages << PAGE_SHIFT; 688 689 map_pages((unsigned long)__va(start_paddr), start_paddr, 690 size, PAGE_KERNEL); 691 } 692 693 #ifdef CONFIG_BLK_DEV_INITRD 694 if (initrd_end && initrd_end > mem_limit) { 695 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); 696 map_pages(initrd_start, __pa(initrd_start), 697 initrd_end - initrd_start, PAGE_KERNEL); 698 } 699 #endif 700 701 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); 702 memset(empty_zero_page, 0, PAGE_SIZE); 703 } 704 705 static void __init gateway_init(void) 706 { 707 unsigned long linux_gateway_page_addr; 708 /* FIXME: This is 'const' in order to trick the compiler 709 into not treating it as DP-relative data. */ 710 extern void * const linux_gateway_page; 711 712 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; 713 714 /* 715 * Setup Linux Gateway page. 716 * 717 * The Linux gateway page will reside in kernel space (on virtual 718 * page 0), so it doesn't need to be aliased into user space. 719 */ 720 721 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), 722 PAGE_SIZE, PAGE_GATEWAY); 723 } 724 725 #ifdef CONFIG_HPUX 726 void 727 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm) 728 { 729 pgd_t *pg_dir; 730 pmd_t *pmd; 731 pte_t *pg_table; 732 unsigned long start_pmd; 733 unsigned long start_pte; 734 unsigned long address; 735 unsigned long hpux_gw_page_addr; 736 /* FIXME: This is 'const' in order to trick the compiler 737 into not treating it as DP-relative data. */ 738 extern void * const hpux_gateway_page; 739 740 hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK; 741 742 /* 743 * Setup HP-UX Gateway page. 744 * 745 * The HP-UX gateway page resides in the user address space, 746 * so it needs to be aliased into each process. 747 */ 748 749 pg_dir = pgd_offset(mm,hpux_gw_page_addr); 750 751 #if PTRS_PER_PMD == 1 752 start_pmd = 0; 753 #else 754 start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); 755 #endif 756 start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 757 758 address = __pa(&hpux_gateway_page); 759 #if PTRS_PER_PMD == 1 760 pmd = (pmd_t *)__pa(pg_dir); 761 #else 762 pmd = (pmd_t *) pgd_address(*pg_dir); 763 764 /* 765 * pmd is physical at this point 766 */ 767 768 if (!pmd) { 769 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL); 770 pmd = (pmd_t *) __pa(pmd); 771 } 772 773 __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd); 774 #endif 775 /* now change pmd to kernel virtual addresses */ 776 777 pmd = (pmd_t *)__va(pmd) + start_pmd; 778 779 /* 780 * pg_table is physical at this point 781 */ 782 783 pg_table = (pte_t *) pmd_address(*pmd); 784 if (!pg_table) 785 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL)); 786 787 __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table); 788 789 /* now change pg_table to kernel virtual addresses */ 790 791 pg_table = (pte_t *) __va(pg_table) + start_pte; 792 set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY)); 793 } 794 EXPORT_SYMBOL(map_hpux_gateway_page); 795 #endif 796 797 void __init paging_init(void) 798 { 799 int i; 800 801 setup_bootmem(); 802 pagetable_init(); 803 gateway_init(); 804 flush_cache_all_local(); /* start with known state */ 805 flush_tlb_all_local(NULL); 806 807 for (i = 0; i < npmem_ranges; i++) { 808 unsigned long zones_size[MAX_NR_ZONES] = { 0, }; 809 810 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages; 811 812 #ifdef CONFIG_DISCONTIGMEM 813 /* Need to initialize the pfnnid_map before we can initialize 814 the zone */ 815 { 816 int j; 817 for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT); 818 j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT); 819 j++) { 820 pfnnid_map[j] = i; 821 } 822 } 823 #endif 824 825 free_area_init_node(i, NODE_DATA(i), zones_size, 826 pmem_ranges[i].start_pfn, NULL); 827 } 828 } 829 830 #ifdef CONFIG_PA20 831 832 /* 833 * Currently, all PA20 chips have 18 bit protection id's, which is the 834 * limiting factor (space ids are 32 bits). 835 */ 836 837 #define NR_SPACE_IDS 262144 838 839 #else 840 841 /* 842 * Currently we have a one-to-one relationship between space id's and 843 * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only 844 * support 15 bit protection id's, so that is the limiting factor. 845 * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's 846 * probably not worth the effort for a special case here. 847 */ 848 849 #define NR_SPACE_IDS 32768 850 851 #endif /* !CONFIG_PA20 */ 852 853 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) 854 #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) 855 856 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ 857 static unsigned long dirty_space_id[SID_ARRAY_SIZE]; 858 static unsigned long space_id_index; 859 static unsigned long free_space_ids = NR_SPACE_IDS - 1; 860 static unsigned long dirty_space_ids = 0; 861 862 static DEFINE_SPINLOCK(sid_lock); 863 864 unsigned long alloc_sid(void) 865 { 866 unsigned long index; 867 868 spin_lock(&sid_lock); 869 870 if (free_space_ids == 0) { 871 if (dirty_space_ids != 0) { 872 spin_unlock(&sid_lock); 873 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ 874 spin_lock(&sid_lock); 875 } 876 BUG_ON(free_space_ids == 0); 877 } 878 879 free_space_ids--; 880 881 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); 882 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1))); 883 space_id_index = index; 884 885 spin_unlock(&sid_lock); 886 887 return index << SPACEID_SHIFT; 888 } 889 890 void free_sid(unsigned long spaceid) 891 { 892 unsigned long index = spaceid >> SPACEID_SHIFT; 893 unsigned long *dirty_space_offset; 894 895 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG); 896 index &= (BITS_PER_LONG - 1); 897 898 spin_lock(&sid_lock); 899 900 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */ 901 902 *dirty_space_offset |= (1L << index); 903 dirty_space_ids++; 904 905 spin_unlock(&sid_lock); 906 } 907 908 909 #ifdef CONFIG_SMP 910 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) 911 { 912 int i; 913 914 /* NOTE: sid_lock must be held upon entry */ 915 916 *ndirtyptr = dirty_space_ids; 917 if (dirty_space_ids != 0) { 918 for (i = 0; i < SID_ARRAY_SIZE; i++) { 919 dirty_array[i] = dirty_space_id[i]; 920 dirty_space_id[i] = 0; 921 } 922 dirty_space_ids = 0; 923 } 924 925 return; 926 } 927 928 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) 929 { 930 int i; 931 932 /* NOTE: sid_lock must be held upon entry */ 933 934 if (ndirty != 0) { 935 for (i = 0; i < SID_ARRAY_SIZE; i++) { 936 space_id[i] ^= dirty_array[i]; 937 } 938 939 free_space_ids += ndirty; 940 space_id_index = 0; 941 } 942 } 943 944 #else /* CONFIG_SMP */ 945 946 static void recycle_sids(void) 947 { 948 int i; 949 950 /* NOTE: sid_lock must be held upon entry */ 951 952 if (dirty_space_ids != 0) { 953 for (i = 0; i < SID_ARRAY_SIZE; i++) { 954 space_id[i] ^= dirty_space_id[i]; 955 dirty_space_id[i] = 0; 956 } 957 958 free_space_ids += dirty_space_ids; 959 dirty_space_ids = 0; 960 space_id_index = 0; 961 } 962 } 963 #endif 964 965 /* 966 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is 967 * purged, we can safely reuse the space ids that were released but 968 * not flushed from the tlb. 969 */ 970 971 #ifdef CONFIG_SMP 972 973 static unsigned long recycle_ndirty; 974 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; 975 static unsigned int recycle_inuse; 976 977 void flush_tlb_all(void) 978 { 979 int do_recycle; 980 981 do_recycle = 0; 982 spin_lock(&sid_lock); 983 if (dirty_space_ids > RECYCLE_THRESHOLD) { 984 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ 985 get_dirty_sids(&recycle_ndirty,recycle_dirty_array); 986 recycle_inuse++; 987 do_recycle++; 988 } 989 spin_unlock(&sid_lock); 990 on_each_cpu(flush_tlb_all_local, NULL, 1, 1); 991 if (do_recycle) { 992 spin_lock(&sid_lock); 993 recycle_sids(recycle_ndirty,recycle_dirty_array); 994 recycle_inuse = 0; 995 spin_unlock(&sid_lock); 996 } 997 } 998 #else 999 void flush_tlb_all(void) 1000 { 1001 spin_lock(&sid_lock); 1002 flush_tlb_all_local(NULL); 1003 recycle_sids(); 1004 spin_unlock(&sid_lock); 1005 } 1006 #endif 1007 1008 #ifdef CONFIG_BLK_DEV_INITRD 1009 void free_initrd_mem(unsigned long start, unsigned long end) 1010 { 1011 if (start >= end) 1012 return; 1013 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 1014 for (; start < end; start += PAGE_SIZE) { 1015 ClearPageReserved(virt_to_page(start)); 1016 init_page_count(virt_to_page(start)); 1017 free_page(start); 1018 num_physpages++; 1019 totalram_pages++; 1020 } 1021 } 1022 #endif 1023