arch/parisc/mm/init.c

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