1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/parisc/mm/init.c 4 * 5 * Copyright (C) 1995 Linus Torvalds 6 * Copyright 1999 SuSE GmbH 7 * changed by Philipp Rumpf 8 * Copyright 1999 Philipp Rumpf (prumpf@tux.org) 9 * Copyright 2004 Randolph Chung (tausq@debian.org) 10 * Copyright 2006-2007 Helge Deller (deller@gmx.de) 11 * 12 */ 13 14 15 #include <linux/module.h> 16 #include <linux/mm.h> 17 #include <linux/bootmem.h> 18 #include <linux/memblock.h> 19 #include <linux/gfp.h> 20 #include <linux/delay.h> 21 #include <linux/init.h> 22 #include <linux/initrd.h> 23 #include <linux/swap.h> 24 #include <linux/unistd.h> 25 #include <linux/nodemask.h> /* for node_online_map */ 26 #include <linux/pagemap.h> /* for release_pages */ 27 #include <linux/compat.h> 28 29 #include <asm/pgalloc.h> 30 #include <asm/pgtable.h> 31 #include <asm/tlb.h> 32 #include <asm/pdc_chassis.h> 33 #include <asm/mmzone.h> 34 #include <asm/sections.h> 35 #include <asm/msgbuf.h> 36 37 extern int data_start; 38 extern void parisc_kernel_start(void); /* Kernel entry point in head.S */ 39 40 #if CONFIG_PGTABLE_LEVELS == 3 41 /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout 42 * with the first pmd adjacent to the pgd and below it. gcc doesn't actually 43 * guarantee that global objects will be laid out in memory in the same order 44 * as the order of declaration, so put these in different sections and use 45 * the linker script to order them. */ 46 pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE))); 47 #endif 48 49 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE))); 50 pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE))); 51 52 #ifdef CONFIG_DISCONTIGMEM 53 struct node_map_data node_data[MAX_NUMNODES] __read_mostly; 54 signed char pfnnid_map[PFNNID_MAP_MAX] __read_mostly; 55 #endif 56 57 static struct resource data_resource = { 58 .name = "Kernel data", 59 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 60 }; 61 62 static struct resource code_resource = { 63 .name = "Kernel code", 64 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 65 }; 66 67 static struct resource pdcdata_resource = { 68 .name = "PDC data (Page Zero)", 69 .start = 0, 70 .end = 0x9ff, 71 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 72 }; 73 74 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly; 75 76 /* The following array is initialized from the firmware specific 77 * information retrieved in kernel/inventory.c. 78 */ 79 80 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly; 81 int npmem_ranges __read_mostly; 82 83 /* 84 * get_memblock() allocates pages via memblock. 85 * We can't use memblock_find_in_range(0, KERNEL_INITIAL_SIZE) here since it 86 * doesn't allocate from bottom to top which is needed because we only created 87 * the initial mapping up to KERNEL_INITIAL_SIZE in the assembly bootup code. 88 */ 89 static void * __init get_memblock(unsigned long size) 90 { 91 static phys_addr_t search_addr __initdata; 92 phys_addr_t phys; 93 94 if (!search_addr) 95 search_addr = PAGE_ALIGN(__pa((unsigned long) &_end)); 96 search_addr = ALIGN(search_addr, size); 97 while (!memblock_is_region_memory(search_addr, size) || 98 memblock_is_region_reserved(search_addr, size)) { 99 search_addr += size; 100 } 101 phys = search_addr; 102 103 if (phys) 104 memblock_reserve(phys, size); 105 else 106 panic("get_memblock() failed.\n"); 107 108 memset(__va(phys), 0, size); 109 110 return __va(phys); 111 } 112 113 #ifdef CONFIG_64BIT 114 #define MAX_MEM (~0UL) 115 #else /* !CONFIG_64BIT */ 116 #define MAX_MEM (3584U*1024U*1024U) 117 #endif /* !CONFIG_64BIT */ 118 119 static unsigned long mem_limit __read_mostly = MAX_MEM; 120 121 static void __init mem_limit_func(void) 122 { 123 char *cp, *end; 124 unsigned long limit; 125 126 /* We need this before __setup() functions are called */ 127 128 limit = MAX_MEM; 129 for (cp = boot_command_line; *cp; ) { 130 if (memcmp(cp, "mem=", 4) == 0) { 131 cp += 4; 132 limit = memparse(cp, &end); 133 if (end != cp) 134 break; 135 cp = end; 136 } else { 137 while (*cp != ' ' && *cp) 138 ++cp; 139 while (*cp == ' ') 140 ++cp; 141 } 142 } 143 144 if (limit < mem_limit) 145 mem_limit = limit; 146 } 147 148 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT) 149 150 static void __init setup_bootmem(void) 151 { 152 unsigned long mem_max; 153 #ifndef CONFIG_DISCONTIGMEM 154 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; 155 int npmem_holes; 156 #endif 157 int i, sysram_resource_count; 158 159 disable_sr_hashing(); /* Turn off space register hashing */ 160 161 /* 162 * Sort the ranges. Since the number of ranges is typically 163 * small, and performance is not an issue here, just do 164 * a simple insertion sort. 165 */ 166 167 for (i = 1; i < npmem_ranges; i++) { 168 int j; 169 170 for (j = i; j > 0; j--) { 171 unsigned long tmp; 172 173 if (pmem_ranges[j-1].start_pfn < 174 pmem_ranges[j].start_pfn) { 175 176 break; 177 } 178 tmp = pmem_ranges[j-1].start_pfn; 179 pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn; 180 pmem_ranges[j].start_pfn = tmp; 181 tmp = pmem_ranges[j-1].pages; 182 pmem_ranges[j-1].pages = pmem_ranges[j].pages; 183 pmem_ranges[j].pages = tmp; 184 } 185 } 186 187 #ifndef CONFIG_DISCONTIGMEM 188 /* 189 * Throw out ranges that are too far apart (controlled by 190 * MAX_GAP). 191 */ 192 193 for (i = 1; i < npmem_ranges; i++) { 194 if (pmem_ranges[i].start_pfn - 195 (pmem_ranges[i-1].start_pfn + 196 pmem_ranges[i-1].pages) > MAX_GAP) { 197 npmem_ranges = i; 198 printk("Large gap in memory detected (%ld pages). " 199 "Consider turning on CONFIG_DISCONTIGMEM\n", 200 pmem_ranges[i].start_pfn - 201 (pmem_ranges[i-1].start_pfn + 202 pmem_ranges[i-1].pages)); 203 break; 204 } 205 } 206 #endif 207 208 /* Print the memory ranges */ 209 pr_info("Memory Ranges:\n"); 210 211 for (i = 0; i < npmem_ranges; i++) { 212 struct resource *res = &sysram_resources[i]; 213 unsigned long start; 214 unsigned long size; 215 216 size = (pmem_ranges[i].pages << PAGE_SHIFT); 217 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); 218 pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", 219 i, start, start + (size - 1), size >> 20); 220 221 /* request memory resource */ 222 res->name = "System RAM"; 223 res->start = start; 224 res->end = start + size - 1; 225 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 226 request_resource(&iomem_resource, res); 227 } 228 229 sysram_resource_count = npmem_ranges; 230 231 /* 232 * For 32 bit kernels we limit the amount of memory we can 233 * support, in order to preserve enough kernel address space 234 * for other purposes. For 64 bit kernels we don't normally 235 * limit the memory, but this mechanism can be used to 236 * artificially limit the amount of memory (and it is written 237 * to work with multiple memory ranges). 238 */ 239 240 mem_limit_func(); /* check for "mem=" argument */ 241 242 mem_max = 0; 243 for (i = 0; i < npmem_ranges; i++) { 244 unsigned long rsize; 245 246 rsize = pmem_ranges[i].pages << PAGE_SHIFT; 247 if ((mem_max + rsize) > mem_limit) { 248 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); 249 if (mem_max == mem_limit) 250 npmem_ranges = i; 251 else { 252 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) 253 - (mem_max >> PAGE_SHIFT); 254 npmem_ranges = i + 1; 255 mem_max = mem_limit; 256 } 257 break; 258 } 259 mem_max += rsize; 260 } 261 262 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); 263 264 #ifndef CONFIG_DISCONTIGMEM 265 /* Merge the ranges, keeping track of the holes */ 266 267 { 268 unsigned long end_pfn; 269 unsigned long hole_pages; 270 271 npmem_holes = 0; 272 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; 273 for (i = 1; i < npmem_ranges; i++) { 274 275 hole_pages = pmem_ranges[i].start_pfn - end_pfn; 276 if (hole_pages) { 277 pmem_holes[npmem_holes].start_pfn = end_pfn; 278 pmem_holes[npmem_holes++].pages = hole_pages; 279 end_pfn += hole_pages; 280 } 281 end_pfn += pmem_ranges[i].pages; 282 } 283 284 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; 285 npmem_ranges = 1; 286 } 287 #endif 288 289 #ifdef CONFIG_DISCONTIGMEM 290 for (i = 0; i < MAX_PHYSMEM_RANGES; i++) { 291 memset(NODE_DATA(i), 0, sizeof(pg_data_t)); 292 } 293 memset(pfnnid_map, 0xff, sizeof(pfnnid_map)); 294 295 for (i = 0; i < npmem_ranges; i++) { 296 node_set_state(i, N_NORMAL_MEMORY); 297 node_set_online(i); 298 } 299 #endif 300 301 /* 302 * Initialize and free the full range of memory in each range. 303 */ 304 305 max_pfn = 0; 306 for (i = 0; i < npmem_ranges; i++) { 307 unsigned long start_pfn; 308 unsigned long npages; 309 unsigned long start; 310 unsigned long size; 311 312 start_pfn = pmem_ranges[i].start_pfn; 313 npages = pmem_ranges[i].pages; 314 315 start = start_pfn << PAGE_SHIFT; 316 size = npages << PAGE_SHIFT; 317 318 /* add system RAM memblock */ 319 memblock_add(start, size); 320 321 if ((start_pfn + npages) > max_pfn) 322 max_pfn = start_pfn + npages; 323 } 324 325 /* IOMMU is always used to access "high mem" on those boxes 326 * that can support enough mem that a PCI device couldn't 327 * directly DMA to any physical addresses. 328 * ISA DMA support will need to revisit this. 329 */ 330 max_low_pfn = max_pfn; 331 332 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ 333 334 #define PDC_CONSOLE_IO_IODC_SIZE 32768 335 336 memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free + 337 PDC_CONSOLE_IO_IODC_SIZE)); 338 memblock_reserve(__pa(KERNEL_BINARY_TEXT_START), 339 (unsigned long)(_end - KERNEL_BINARY_TEXT_START)); 340 341 #ifndef CONFIG_DISCONTIGMEM 342 343 /* reserve the holes */ 344 345 for (i = 0; i < npmem_holes; i++) { 346 memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT), 347 (pmem_holes[i].pages << PAGE_SHIFT)); 348 } 349 #endif 350 351 #ifdef CONFIG_BLK_DEV_INITRD 352 if (initrd_start) { 353 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); 354 if (__pa(initrd_start) < mem_max) { 355 unsigned long initrd_reserve; 356 357 if (__pa(initrd_end) > mem_max) { 358 initrd_reserve = mem_max - __pa(initrd_start); 359 } else { 360 initrd_reserve = initrd_end - initrd_start; 361 } 362 initrd_below_start_ok = 1; 363 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); 364 365 memblock_reserve(__pa(initrd_start), initrd_reserve); 366 } 367 } 368 #endif 369 370 data_resource.start = virt_to_phys(&data_start); 371 data_resource.end = virt_to_phys(_end) - 1; 372 code_resource.start = virt_to_phys(_text); 373 code_resource.end = virt_to_phys(&data_start)-1; 374 375 /* We don't know which region the kernel will be in, so try 376 * all of them. 377 */ 378 for (i = 0; i < sysram_resource_count; i++) { 379 struct resource *res = &sysram_resources[i]; 380 request_resource(res, &code_resource); 381 request_resource(res, &data_resource); 382 } 383 request_resource(&sysram_resources[0], &pdcdata_resource); 384 385 /* Initialize Page Deallocation Table (PDT) and check for bad memory. */ 386 pdc_pdt_init(); 387 } 388 389 static int __init parisc_text_address(unsigned long vaddr) 390 { 391 static unsigned long head_ptr __initdata; 392 393 if (!head_ptr) 394 head_ptr = PAGE_MASK & (unsigned long) 395 dereference_function_descriptor(&parisc_kernel_start); 396 397 return core_kernel_text(vaddr) || vaddr == head_ptr; 398 } 399 400 static void __init map_pages(unsigned long start_vaddr, 401 unsigned long start_paddr, unsigned long size, 402 pgprot_t pgprot, int force) 403 { 404 pgd_t *pg_dir; 405 pmd_t *pmd; 406 pte_t *pg_table; 407 unsigned long end_paddr; 408 unsigned long start_pmd; 409 unsigned long start_pte; 410 unsigned long tmp1; 411 unsigned long tmp2; 412 unsigned long address; 413 unsigned long vaddr; 414 unsigned long ro_start; 415 unsigned long ro_end; 416 unsigned long kernel_end; 417 418 ro_start = __pa((unsigned long)_text); 419 ro_end = __pa((unsigned long)&data_start); 420 kernel_end = __pa((unsigned long)&_end); 421 422 end_paddr = start_paddr + size; 423 424 pg_dir = pgd_offset_k(start_vaddr); 425 426 #if PTRS_PER_PMD == 1 427 start_pmd = 0; 428 #else 429 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); 430 #endif 431 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 432 433 address = start_paddr; 434 vaddr = start_vaddr; 435 while (address < end_paddr) { 436 #if PTRS_PER_PMD == 1 437 pmd = (pmd_t *)__pa(pg_dir); 438 #else 439 pmd = (pmd_t *)pgd_address(*pg_dir); 440 441 /* 442 * pmd is physical at this point 443 */ 444 445 if (!pmd) { 446 pmd = (pmd_t *) get_memblock(PAGE_SIZE << PMD_ORDER); 447 pmd = (pmd_t *) __pa(pmd); 448 } 449 450 pgd_populate(NULL, pg_dir, __va(pmd)); 451 #endif 452 pg_dir++; 453 454 /* now change pmd to kernel virtual addresses */ 455 456 pmd = (pmd_t *)__va(pmd) + start_pmd; 457 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) { 458 459 /* 460 * pg_table is physical at this point 461 */ 462 463 pg_table = (pte_t *)pmd_address(*pmd); 464 if (!pg_table) { 465 pg_table = (pte_t *) get_memblock(PAGE_SIZE); 466 pg_table = (pte_t *) __pa(pg_table); 467 } 468 469 pmd_populate_kernel(NULL, pmd, __va(pg_table)); 470 471 /* now change pg_table to kernel virtual addresses */ 472 473 pg_table = (pte_t *) __va(pg_table) + start_pte; 474 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) { 475 pte_t pte; 476 477 if (force) 478 pte = __mk_pte(address, pgprot); 479 else if (parisc_text_address(vaddr)) { 480 pte = __mk_pte(address, PAGE_KERNEL_EXEC); 481 if (address >= ro_start && address < kernel_end) 482 pte = pte_mkhuge(pte); 483 } 484 else 485 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) 486 if (address >= ro_start && address < ro_end) { 487 pte = __mk_pte(address, PAGE_KERNEL_EXEC); 488 pte = pte_mkhuge(pte); 489 } else 490 #endif 491 { 492 pte = __mk_pte(address, pgprot); 493 if (address >= ro_start && address < kernel_end) 494 pte = pte_mkhuge(pte); 495 } 496 497 if (address >= end_paddr) 498 break; 499 500 set_pte(pg_table, pte); 501 502 address += PAGE_SIZE; 503 vaddr += PAGE_SIZE; 504 } 505 start_pte = 0; 506 507 if (address >= end_paddr) 508 break; 509 } 510 start_pmd = 0; 511 } 512 } 513 514 void __init set_kernel_text_rw(int enable_read_write) 515 { 516 unsigned long start = (unsigned long)_stext; 517 unsigned long end = (unsigned long)_etext; 518 519 map_pages(start, __pa(start), end-start, 520 PAGE_KERNEL_RWX, enable_read_write ? 1:0); 521 522 /* force the kernel to see the new TLB entries */ 523 __flush_tlb_range(0, start, end); 524 525 /* dump old cached instructions */ 526 flush_icache_range(start, end); 527 } 528 529 void __ref free_initmem(void) 530 { 531 unsigned long init_begin = (unsigned long)__init_begin; 532 unsigned long init_end = (unsigned long)__init_end; 533 534 /* The init text pages are marked R-X. We have to 535 * flush the icache and mark them RW- 536 * 537 * This is tricky, because map_pages is in the init section. 538 * Do a dummy remap of the data section first (the data 539 * section is already PAGE_KERNEL) to pull in the TLB entries 540 * for map_kernel */ 541 map_pages(init_begin, __pa(init_begin), init_end - init_begin, 542 PAGE_KERNEL_RWX, 1); 543 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute 544 * map_pages */ 545 map_pages(init_begin, __pa(init_begin), init_end - init_begin, 546 PAGE_KERNEL, 1); 547 548 /* force the kernel to see the new TLB entries */ 549 __flush_tlb_range(0, init_begin, init_end); 550 551 /* finally dump all the instructions which were cached, since the 552 * pages are no-longer executable */ 553 flush_icache_range(init_begin, init_end); 554 555 free_initmem_default(POISON_FREE_INITMEM); 556 557 /* set up a new led state on systems shipped LED State panel */ 558 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); 559 } 560 561 562 #ifdef CONFIG_STRICT_KERNEL_RWX 563 void mark_rodata_ro(void) 564 { 565 /* rodata memory was already mapped with KERNEL_RO access rights by 566 pagetable_init() and map_pages(). No need to do additional stuff here */ 567 printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n", 568 (unsigned long)(__end_rodata - __start_rodata) >> 10); 569 } 570 #endif 571 572 573 /* 574 * Just an arbitrary offset to serve as a "hole" between mapping areas 575 * (between top of physical memory and a potential pcxl dma mapping 576 * area, and below the vmalloc mapping area). 577 * 578 * The current 32K value just means that there will be a 32K "hole" 579 * between mapping areas. That means that any out-of-bounds memory 580 * accesses will hopefully be caught. The vmalloc() routines leaves 581 * a hole of 4kB between each vmalloced area for the same reason. 582 */ 583 584 /* Leave room for gateway page expansion */ 585 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE 586 #error KERNEL_MAP_START is in gateway reserved region 587 #endif 588 #define MAP_START (KERNEL_MAP_START) 589 590 #define VM_MAP_OFFSET (32*1024) 591 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ 592 & ~(VM_MAP_OFFSET-1))) 593 594 void *parisc_vmalloc_start __read_mostly; 595 EXPORT_SYMBOL(parisc_vmalloc_start); 596 597 #ifdef CONFIG_PA11 598 unsigned long pcxl_dma_start __read_mostly; 599 #endif 600 601 void __init mem_init(void) 602 { 603 /* Do sanity checks on IPC (compat) structures */ 604 BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48); 605 #ifndef CONFIG_64BIT 606 BUILD_BUG_ON(sizeof(struct semid64_ds) != 80); 607 BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104); 608 BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104); 609 #endif 610 #ifdef CONFIG_COMPAT 611 BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm)); 612 BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80); 613 BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104); 614 BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104); 615 #endif 616 617 /* Do sanity checks on page table constants */ 618 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t)); 619 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t)); 620 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t)); 621 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD 622 > BITS_PER_LONG); 623 624 high_memory = __va((max_pfn << PAGE_SHIFT)); 625 set_max_mapnr(page_to_pfn(virt_to_page(high_memory - 1)) + 1); 626 free_all_bootmem(); 627 628 #ifdef CONFIG_PA11 629 if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) { 630 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); 631 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start 632 + PCXL_DMA_MAP_SIZE); 633 } else 634 #endif 635 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); 636 637 mem_init_print_info(NULL); 638 639 #if 0 640 /* 641 * Do not expose the virtual kernel memory layout to userspace. 642 * But keep code for debugging purposes. 643 */ 644 printk("virtual kernel memory layout:\n" 645 " vmalloc : 0x%px - 0x%px (%4ld MB)\n" 646 " memory : 0x%px - 0x%px (%4ld MB)\n" 647 " .init : 0x%px - 0x%px (%4ld kB)\n" 648 " .data : 0x%px - 0x%px (%4ld kB)\n" 649 " .text : 0x%px - 0x%px (%4ld kB)\n", 650 651 (void*)VMALLOC_START, (void*)VMALLOC_END, 652 (VMALLOC_END - VMALLOC_START) >> 20, 653 654 __va(0), high_memory, 655 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, 656 657 __init_begin, __init_end, 658 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10, 659 660 _etext, _edata, 661 ((unsigned long)_edata - (unsigned long)_etext) >> 10, 662 663 _text, _etext, 664 ((unsigned long)_etext - (unsigned long)_text) >> 10); 665 #endif 666 } 667 668 unsigned long *empty_zero_page __read_mostly; 669 EXPORT_SYMBOL(empty_zero_page); 670 671 /* 672 * pagetable_init() sets up the page tables 673 * 674 * Note that gateway_init() places the Linux gateway page at page 0. 675 * Since gateway pages cannot be dereferenced this has the desirable 676 * side effect of trapping those pesky NULL-reference errors in the 677 * kernel. 678 */ 679 static void __init pagetable_init(void) 680 { 681 int range; 682 683 /* Map each physical memory range to its kernel vaddr */ 684 685 for (range = 0; range < npmem_ranges; range++) { 686 unsigned long start_paddr; 687 unsigned long end_paddr; 688 unsigned long size; 689 690 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; 691 size = pmem_ranges[range].pages << PAGE_SHIFT; 692 end_paddr = start_paddr + size; 693 694 map_pages((unsigned long)__va(start_paddr), start_paddr, 695 size, PAGE_KERNEL, 0); 696 } 697 698 #ifdef CONFIG_BLK_DEV_INITRD 699 if (initrd_end && initrd_end > mem_limit) { 700 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); 701 map_pages(initrd_start, __pa(initrd_start), 702 initrd_end - initrd_start, PAGE_KERNEL, 0); 703 } 704 #endif 705 706 empty_zero_page = get_memblock(PAGE_SIZE); 707 } 708 709 static void __init gateway_init(void) 710 { 711 unsigned long linux_gateway_page_addr; 712 /* FIXME: This is 'const' in order to trick the compiler 713 into not treating it as DP-relative data. */ 714 extern void * const linux_gateway_page; 715 716 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; 717 718 /* 719 * Setup Linux Gateway page. 720 * 721 * The Linux gateway page will reside in kernel space (on virtual 722 * page 0), so it doesn't need to be aliased into user space. 723 */ 724 725 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), 726 PAGE_SIZE, PAGE_GATEWAY, 1); 727 } 728 729 void __init paging_init(void) 730 { 731 int i; 732 733 setup_bootmem(); 734 pagetable_init(); 735 gateway_init(); 736 flush_cache_all_local(); /* start with known state */ 737 flush_tlb_all_local(NULL); 738 739 for (i = 0; i < npmem_ranges; i++) { 740 unsigned long zones_size[MAX_NR_ZONES] = { 0, }; 741 742 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages; 743 744 #ifdef CONFIG_DISCONTIGMEM 745 /* Need to initialize the pfnnid_map before we can initialize 746 the zone */ 747 { 748 int j; 749 for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT); 750 j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT); 751 j++) { 752 pfnnid_map[j] = i; 753 } 754 } 755 #endif 756 757 free_area_init_node(i, zones_size, 758 pmem_ranges[i].start_pfn, NULL); 759 } 760 } 761 762 #ifdef CONFIG_PA20 763 764 /* 765 * Currently, all PA20 chips have 18 bit protection IDs, which is the 766 * limiting factor (space ids are 32 bits). 767 */ 768 769 #define NR_SPACE_IDS 262144 770 771 #else 772 773 /* 774 * Currently we have a one-to-one relationship between space IDs and 775 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only 776 * support 15 bit protection IDs, so that is the limiting factor. 777 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's 778 * probably not worth the effort for a special case here. 779 */ 780 781 #define NR_SPACE_IDS 32768 782 783 #endif /* !CONFIG_PA20 */ 784 785 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) 786 #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) 787 788 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ 789 static unsigned long dirty_space_id[SID_ARRAY_SIZE]; 790 static unsigned long space_id_index; 791 static unsigned long free_space_ids = NR_SPACE_IDS - 1; 792 static unsigned long dirty_space_ids = 0; 793 794 static DEFINE_SPINLOCK(sid_lock); 795 796 unsigned long alloc_sid(void) 797 { 798 unsigned long index; 799 800 spin_lock(&sid_lock); 801 802 if (free_space_ids == 0) { 803 if (dirty_space_ids != 0) { 804 spin_unlock(&sid_lock); 805 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ 806 spin_lock(&sid_lock); 807 } 808 BUG_ON(free_space_ids == 0); 809 } 810 811 free_space_ids--; 812 813 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); 814 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1))); 815 space_id_index = index; 816 817 spin_unlock(&sid_lock); 818 819 return index << SPACEID_SHIFT; 820 } 821 822 void free_sid(unsigned long spaceid) 823 { 824 unsigned long index = spaceid >> SPACEID_SHIFT; 825 unsigned long *dirty_space_offset; 826 827 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG); 828 index &= (BITS_PER_LONG - 1); 829 830 spin_lock(&sid_lock); 831 832 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */ 833 834 *dirty_space_offset |= (1L << index); 835 dirty_space_ids++; 836 837 spin_unlock(&sid_lock); 838 } 839 840 841 #ifdef CONFIG_SMP 842 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) 843 { 844 int i; 845 846 /* NOTE: sid_lock must be held upon entry */ 847 848 *ndirtyptr = dirty_space_ids; 849 if (dirty_space_ids != 0) { 850 for (i = 0; i < SID_ARRAY_SIZE; i++) { 851 dirty_array[i] = dirty_space_id[i]; 852 dirty_space_id[i] = 0; 853 } 854 dirty_space_ids = 0; 855 } 856 857 return; 858 } 859 860 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) 861 { 862 int i; 863 864 /* NOTE: sid_lock must be held upon entry */ 865 866 if (ndirty != 0) { 867 for (i = 0; i < SID_ARRAY_SIZE; i++) { 868 space_id[i] ^= dirty_array[i]; 869 } 870 871 free_space_ids += ndirty; 872 space_id_index = 0; 873 } 874 } 875 876 #else /* CONFIG_SMP */ 877 878 static void recycle_sids(void) 879 { 880 int i; 881 882 /* NOTE: sid_lock must be held upon entry */ 883 884 if (dirty_space_ids != 0) { 885 for (i = 0; i < SID_ARRAY_SIZE; i++) { 886 space_id[i] ^= dirty_space_id[i]; 887 dirty_space_id[i] = 0; 888 } 889 890 free_space_ids += dirty_space_ids; 891 dirty_space_ids = 0; 892 space_id_index = 0; 893 } 894 } 895 #endif 896 897 /* 898 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is 899 * purged, we can safely reuse the space ids that were released but 900 * not flushed from the tlb. 901 */ 902 903 #ifdef CONFIG_SMP 904 905 static unsigned long recycle_ndirty; 906 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; 907 static unsigned int recycle_inuse; 908 909 void flush_tlb_all(void) 910 { 911 int do_recycle; 912 913 __inc_irq_stat(irq_tlb_count); 914 do_recycle = 0; 915 spin_lock(&sid_lock); 916 if (dirty_space_ids > RECYCLE_THRESHOLD) { 917 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ 918 get_dirty_sids(&recycle_ndirty,recycle_dirty_array); 919 recycle_inuse++; 920 do_recycle++; 921 } 922 spin_unlock(&sid_lock); 923 on_each_cpu(flush_tlb_all_local, NULL, 1); 924 if (do_recycle) { 925 spin_lock(&sid_lock); 926 recycle_sids(recycle_ndirty,recycle_dirty_array); 927 recycle_inuse = 0; 928 spin_unlock(&sid_lock); 929 } 930 } 931 #else 932 void flush_tlb_all(void) 933 { 934 __inc_irq_stat(irq_tlb_count); 935 spin_lock(&sid_lock); 936 flush_tlb_all_local(NULL); 937 recycle_sids(); 938 spin_unlock(&sid_lock); 939 } 940 #endif 941 942 #ifdef CONFIG_BLK_DEV_INITRD 943 void free_initrd_mem(unsigned long start, unsigned long end) 944 { 945 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 946 } 947 #endif 948