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Merge branch 'bkl/procfs' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic...
[linux-2.6-block.git] / arch / parisc / mm / init.c
CommitLineData
1da177e4
LT		 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)
a8f44e38 9 * Copyright 2006-2007 Helge Deller (deller@gmx.de)
1da177e4
LT		 10 *
11 */
12
1da177e4
LT		 13
14#include <linux/module.h>
15#include <linux/mm.h>
16#include <linux/bootmem.h>
5a0e3ad6 17#include <linux/gfp.h>
1da177e4
LT		 18#include <linux/delay.h>
19#include <linux/init.h>
20#include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */
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 and page_cache_release */
26
27#include <asm/pgalloc.h>
ce8420bb 28#include <asm/pgtable.h>
1da177e4
LT		 29#include <asm/tlb.h>
30#include <asm/pdc_chassis.h>
31#include <asm/mmzone.h>
a581c2a4 32#include <asm/sections.h>
1da177e4
LT		 33
34DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
35
1da177e4 36extern int data_start;
1da177e4
LT		 37
38#ifdef CONFIG_DISCONTIGMEM
8039de10 39struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
8039de10 40unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
1da177e4
LT		 41#endif
42
43static struct resource data_resource = {
44 .name = "Kernel data",
45 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
46};
47
48static struct resource code_resource = {
49 .name = "Kernel code",
50 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
51};
52
53static struct resource pdcdata_resource = {
54 .name = "PDC data (Page Zero)",
55 .start = 0,
56 .end = 0x9ff,
57 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
58};
59
8039de10 60static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
1da177e4
LT		 61
62/* The following array is initialized from the firmware specific
63 * information retrieved in kernel/inventory.c.
64 */
65
8039de10
HD		 66physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
67int npmem_ranges __read_mostly;
1da177e4 68
a8f44e38 69#ifdef CONFIG_64BIT
1da177e4 70#define MAX_MEM (~0UL)
a8f44e38 71#else /* !CONFIG_64BIT */
1da177e4 72#define MAX_MEM (3584U*1024U*1024U)
a8f44e38 73#endif /* !CONFIG_64BIT */
1da177e4 74
8039de10 75static unsigned long mem_limit __read_mostly = MAX_MEM;
1da177e4
LT		 76
77static void __init mem_limit_func(void)
78{
79 char *cp, *end;
80 unsigned long limit;
1da177e4
LT		 81
82 /* We need this before __setup() functions are called */
83
84 limit = MAX_MEM;
668f9931 85 for (cp = boot_command_line; *cp; ) {
1da177e4
LT		 86 if (memcmp(cp, "mem=", 4) == 0) {
87 cp += 4;
88 limit = memparse(cp, &end);
89 if (end != cp)
90 break;
91 cp = end;
92 } else {
93 while (*cp != ' ' && *cp)
94 ++cp;
95 while (*cp == ' ')
96 ++cp;
97 }
98 }
99
100 if (limit < mem_limit)
101 mem_limit = limit;
102}
103
104#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
105
106static void __init setup_bootmem(void)
107{
108 unsigned long bootmap_size;
109 unsigned long mem_max;
110 unsigned long bootmap_pages;
111 unsigned long bootmap_start_pfn;
112 unsigned long bootmap_pfn;
113#ifndef CONFIG_DISCONTIGMEM
114 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
115 int npmem_holes;
116#endif
117 int i, sysram_resource_count;
118
119 disable_sr_hashing(); /* Turn off space register hashing */
120
121 /*
122 * Sort the ranges. Since the number of ranges is typically
123 * small, and performance is not an issue here, just do
124 * a simple insertion sort.
125 */
126
127 for (i = 1; i < npmem_ranges; i++) {
128 int j;
129
130 for (j = i; j > 0; j--) {
131 unsigned long tmp;
132
133 if (pmem_ranges[j-1].start_pfn <
134 pmem_ranges[j].start_pfn) {
135
136 break;
137 }
138 tmp = pmem_ranges[j-1].start_pfn;
139 pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
140 pmem_ranges[j].start_pfn = tmp;
141 tmp = pmem_ranges[j-1].pages;
142 pmem_ranges[j-1].pages = pmem_ranges[j].pages;
143 pmem_ranges[j].pages = tmp;
144 }
145 }
146
147#ifndef CONFIG_DISCONTIGMEM
148 /*
149 * Throw out ranges that are too far apart (controlled by
150 * MAX_GAP).
151 */
152
153 for (i = 1; i < npmem_ranges; i++) {
154 if (pmem_ranges[i].start_pfn -
155 (pmem_ranges[i-1].start_pfn +
156 pmem_ranges[i-1].pages) > MAX_GAP) {
157 npmem_ranges = i;
158 printk("Large gap in memory detected (%ld pages). "
159 "Consider turning on CONFIG_DISCONTIGMEM\n",
160 pmem_ranges[i].start_pfn -
161 (pmem_ranges[i-1].start_pfn +
162 pmem_ranges[i-1].pages));
163 break;
164 }
165 }
166#endif
167
168 if (npmem_ranges > 1) {
169
170 /* Print the memory ranges */
171
172 printk(KERN_INFO "Memory Ranges:\n");
173
174 for (i = 0; i < npmem_ranges; i++) {
175 unsigned long start;
176 unsigned long size;
177
178 size = (pmem_ranges[i].pages << PAGE_SHIFT);
179 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
180 printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
181 i,start, start + (size - 1), size >> 20);
182 }
183 }
184
185 sysram_resource_count = npmem_ranges;
186 for (i = 0; i < sysram_resource_count; i++) {
187 struct resource *res = &sysram_resources[i];
188 res->name = "System RAM";
189 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
190 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
191 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
192 request_resource(&iomem_resource, res);
193 }
194
195 /*
196 * For 32 bit kernels we limit the amount of memory we can
197 * support, in order to preserve enough kernel address space
198 * for other purposes. For 64 bit kernels we don't normally
199 * limit the memory, but this mechanism can be used to
200 * artificially limit the amount of memory (and it is written
201 * to work with multiple memory ranges).
202 */
203
204 mem_limit_func(); /* check for "mem=" argument */
205
206 mem_max = 0;
207 num_physpages = 0;
208 for (i = 0; i < npmem_ranges; i++) {
209 unsigned long rsize;
210
211 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
212 if ((mem_max + rsize) > mem_limit) {
213 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
214 if (mem_max == mem_limit)
215 npmem_ranges = i;
216 else {
217 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
218 - (mem_max >> PAGE_SHIFT);
219 npmem_ranges = i + 1;
220 mem_max = mem_limit;
221 }
222 num_physpages += pmem_ranges[i].pages;
223 break;
224 }
225 num_physpages += pmem_ranges[i].pages;
226 mem_max += rsize;
227 }
228
229 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
230
231#ifndef CONFIG_DISCONTIGMEM
232 /* Merge the ranges, keeping track of the holes */
233
234 {
235 unsigned long end_pfn;
236 unsigned long hole_pages;
237
238 npmem_holes = 0;
239 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
240 for (i = 1; i < npmem_ranges; i++) {
241
242 hole_pages = pmem_ranges[i].start_pfn - end_pfn;
243 if (hole_pages) {
244 pmem_holes[npmem_holes].start_pfn = end_pfn;
245 pmem_holes[npmem_holes++].pages = hole_pages;
246 end_pfn += hole_pages;
247 }
248 end_pfn += pmem_ranges[i].pages;
249 }
250
251 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
252 npmem_ranges = 1;
253 }
254#endif
255
256 bootmap_pages = 0;
257 for (i = 0; i < npmem_ranges; i++)
258 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
259
260 bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
261
262#ifdef CONFIG_DISCONTIGMEM
263 for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
264 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
b61bfa3c 265 NODE_DATA(i)->bdata = &bootmem_node_data[i];
1da177e4
LT		 266 }
267 memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
268
269 for (i = 0; i < npmem_ranges; i++)
270 node_set_online(i);
271#endif
272
273 /*
274 * Initialize and free the full range of memory in each range.
275 * Note that the only writing these routines do are to the bootmap,
276 * and we've made sure to locate the bootmap properly so that they
277 * won't be writing over anything important.
278 */
279
280 bootmap_pfn = bootmap_start_pfn;
281 max_pfn = 0;
282 for (i = 0; i < npmem_ranges; i++) {
283 unsigned long start_pfn;
284 unsigned long npages;
285
286 start_pfn = pmem_ranges[i].start_pfn;
287 npages = pmem_ranges[i].pages;
288
289 bootmap_size = init_bootmem_node(NODE_DATA(i),
290 bootmap_pfn,
291 start_pfn,
292 (start_pfn + npages) );
293 free_bootmem_node(NODE_DATA(i),
294 (start_pfn << PAGE_SHIFT),
295 (npages << PAGE_SHIFT) );
296 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
297 if ((start_pfn + npages) > max_pfn)
298 max_pfn = start_pfn + npages;
299 }
300
5cdb8205
GG		 301 /* IOMMU is always used to access "high mem" on those boxes
302 * that can support enough mem that a PCI device couldn't
303 * directly DMA to any physical addresses.
304 * ISA DMA support will need to revisit this.
305 */
306 max_low_pfn = max_pfn;
307
8980a7ba
HD		 308 /* bootmap sizing messed up? */
309 BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
1da177e4
LT		 310
311 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
312
313#define PDC_CONSOLE_IO_IODC_SIZE 32768
314
315 reserve_bootmem_node(NODE_DATA(0), 0UL,
72a7fe39
BW		 316 (unsigned long)(PAGE0->mem_free +
317 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
c51d476a 318 reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
72a7fe39 319 (unsigned long)(_end - _text), BOOTMEM_DEFAULT);
1da177e4 320 reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
72a7fe39
BW		 321 ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
322 BOOTMEM_DEFAULT);
1da177e4
LT		 323
324#ifndef CONFIG_DISCONTIGMEM
325
326 /* reserve the holes */
327
328 for (i = 0; i < npmem_holes; i++) {
329 reserve_bootmem_node(NODE_DATA(0),
330 (pmem_holes[i].start_pfn << PAGE_SHIFT),
72a7fe39
BW		 331 (pmem_holes[i].pages << PAGE_SHIFT),
332 BOOTMEM_DEFAULT);
1da177e4
LT		 333 }
334#endif
335
336#ifdef CONFIG_BLK_DEV_INITRD
337 if (initrd_start) {
338 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
339 if (__pa(initrd_start) < mem_max) {
340 unsigned long initrd_reserve;
341
342 if (__pa(initrd_end) > mem_max) {
343 initrd_reserve = mem_max - __pa(initrd_start);
344 } else {
345 initrd_reserve = initrd_end - initrd_start;
346 }
347 initrd_below_start_ok = 1;
348 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
349
72a7fe39
BW		 350 reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
351 initrd_reserve, BOOTMEM_DEFAULT);
1da177e4
LT		 352 }
353 }
354#endif
355
356 data_resource.start = virt_to_phys(&data_start);
c51d476a
KM		 357 data_resource.end = virt_to_phys(_end) - 1;
358 code_resource.start = virt_to_phys(_text);
1da177e4
LT		 359 code_resource.end = virt_to_phys(&data_start)-1;
360
361 /* We don't know which region the kernel will be in, so try
362 * all of them.
363 */
364 for (i = 0; i < sysram_resource_count; i++) {
365 struct resource *res = &sysram_resources[i];
366 request_resource(res, &code_resource);
367 request_resource(res, &data_resource);
368 }
369 request_resource(&sysram_resources[0], &pdcdata_resource);
370}
371
372void free_initmem(void)
373{
4fb11781
KM		 374 unsigned long addr;
375 unsigned long init_begin = (unsigned long)__init_begin;
376 unsigned long init_end = (unsigned long)__init_end;
1da177e4 377
81a3de3e 378#ifdef CONFIG_DEBUG_KERNEL
1da177e4
LT		 379 /* Attempt to catch anyone trying to execute code here
380 * by filling the page with BRK insns.
1da177e4 381 */
20dbc9f7 382 memset((void *)init_begin, 0x00, init_end - init_begin);
4fb11781 383 flush_icache_range(init_begin, init_end);
1da177e4
LT		 384#endif
385
2fd83038
HD		 386 /* align __init_begin and __init_end to page size,
387 ignoring linker script where we might have tried to save RAM */
4fb11781
KM		 388 init_begin = PAGE_ALIGN(init_begin);
389 init_end = PAGE_ALIGN(init_end);
2fd83038 390 for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
1da177e4 391 ClearPageReserved(virt_to_page(addr));
7835e98b 392 init_page_count(virt_to_page(addr));
1da177e4
LT		 393 free_page(addr);
394 num_physpages++;
395 totalram_pages++;
396 }
397
398 /* set up a new led state on systems shipped LED State panel */
399 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
400
4fb11781
KM		 401 printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n",
402 (init_end - init_begin) >> 10);
1da177e4
LT		 403}
404
1bcdd854
HD		 405
406#ifdef CONFIG_DEBUG_RODATA
407void mark_rodata_ro(void)
408{
1bcdd854
HD		 409 /* rodata memory was already mapped with KERNEL_RO access rights by
410 pagetable_init() and map_pages(). No need to do additional stuff here */
411 printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
a581c2a4 412 (unsigned long)(__end_rodata - __start_rodata) >> 10);
1bcdd854
HD		 413}
414#endif
415
416
1da177e4
LT		 417/*
418 * Just an arbitrary offset to serve as a "hole" between mapping areas
419 * (between top of physical memory and a potential pcxl dma mapping
420 * area, and below the vmalloc mapping area).
421 *
422 * The current 32K value just means that there will be a 32K "hole"
423 * between mapping areas. That means that any out-of-bounds memory
424 * accesses will hopefully be caught. The vmalloc() routines leaves
425 * a hole of 4kB between each vmalloced area for the same reason.
426 */
427
428 /* Leave room for gateway page expansion */
429#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
430#error KERNEL_MAP_START is in gateway reserved region
431#endif
432#define MAP_START (KERNEL_MAP_START)
433
434#define VM_MAP_OFFSET (32*1024)
435#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
436 & ~(VM_MAP_OFFSET-1)))
437
4255f0d2
HD		 438void *parisc_vmalloc_start __read_mostly;
439EXPORT_SYMBOL(parisc_vmalloc_start);
1da177e4
LT		 440
441#ifdef CONFIG_PA11
8039de10 442unsigned long pcxl_dma_start __read_mostly;
1da177e4
LT		 443#endif
444
445void __init mem_init(void)
446{
ce8420bb 447 int codesize, reservedpages, datasize, initsize;
ce8420bb 448
48d27cb2
HD		 449 /* Do sanity checks on page table constants */
450 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
451 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
452 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
453 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
454 > BITS_PER_LONG);
455
1da177e4
LT		 456 high_memory = __va((max_pfn << PAGE_SHIFT));
457
458#ifndef CONFIG_DISCONTIGMEM
459 max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
460 totalram_pages += free_all_bootmem();
461#else
462 {
463 int i;
464
465 for (i = 0; i < npmem_ranges; i++)
466 totalram_pages += free_all_bootmem_node(NODE_DATA(i));
467 }
468#endif
469
53faf291
KM		 470 codesize = (unsigned long)_etext - (unsigned long)_text;
471 datasize = (unsigned long)_edata - (unsigned long)_etext;
472 initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
ce8420bb
HD		 473
474 reservedpages = 0;
53faf291
KM		 475{
476 unsigned long pfn;
477#ifdef CONFIG_DISCONTIGMEM
478 int i;
479
480 for (i = 0; i < npmem_ranges; i++) {
481 for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
482 if (PageReserved(pfn_to_page(pfn)))
483 reservedpages++;
484 }
485 }
486#else /* !CONFIG_DISCONTIGMEM */
487 for (pfn = 0; pfn < max_pfn; pfn++) {
ce8420bb
HD		 488 /*
489 * Only count reserved RAM pages
490 */
53faf291 491 if (PageReserved(pfn_to_page(pfn)))
ce8420bb 492 reservedpages++;
53faf291
KM		 493 }
494#endif
495}
1da177e4
LT		 496
497#ifdef CONFIG_PA11
498 if (hppa_dma_ops == &pcxl_dma_ops) {
499 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
4255f0d2
HD		 500 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
501 + PCXL_DMA_MAP_SIZE);
1da177e4
LT		 502 } else {
503 pcxl_dma_start = 0;
4255f0d2 504 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
1da177e4
LT		 505 }
506#else
4255f0d2 507 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
1da177e4
LT		 508#endif
509
53faf291 510 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
cc013a88 511 nr_free_pages() << (PAGE_SHIFT-10),
ce8420bb
HD		 512 num_physpages << (PAGE_SHIFT-10),
513 codesize >> 10,
514 reservedpages << (PAGE_SHIFT-10),
515 datasize >> 10,
53faf291
KM		 516 initsize >> 10
517 );
ce8420bb
HD		 518
519#ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
520 printk("virtual kernel memory layout:\n"
521 " vmalloc : 0x%p - 0x%p (%4ld MB)\n"
53faf291 522 " memory : 0x%p - 0x%p (%4ld MB)\n"
ce8420bb
HD		 523 " .init : 0x%p - 0x%p (%4ld kB)\n"
524 " .data : 0x%p - 0x%p (%4ld kB)\n"
525 " .text : 0x%p - 0x%p (%4ld kB)\n",
526
527 (void*)VMALLOC_START, (void*)VMALLOC_END,
528 (VMALLOC_END - VMALLOC_START) >> 20,
529
530 __va(0), high_memory,
531 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
532
53faf291
KM		 533 __init_begin, __init_end,
534 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
ce8420bb 535
53faf291
KM		 536 _etext, _edata,
537 ((unsigned long)_edata - (unsigned long)_etext) >> 10,
ce8420bb 538
53faf291
KM		 539 _text, _etext,
540 ((unsigned long)_etext - (unsigned long)_text) >> 10);
ce8420bb 541#endif
1da177e4
LT		 542}
543
8039de10 544unsigned long *empty_zero_page __read_mostly;
22febf1f 545EXPORT_SYMBOL(empty_zero_page);
1da177e4
LT		 546
547void show_mem(void)
548{
549 int i,free = 0,total = 0,reserved = 0;
550 int shared = 0, cached = 0;
551
552 printk(KERN_INFO "Mem-info:\n");
553 show_free_areas();
1da177e4
LT		 554#ifndef CONFIG_DISCONTIGMEM
555 i = max_mapnr;
556 while (i-- > 0) {
557 total++;
558 if (PageReserved(mem_map+i))
559 reserved++;
560 else if (PageSwapCache(mem_map+i))
561 cached++;
562 else if (!page_count(&mem_map[i]))
563 free++;
564 else
565 shared += page_count(&mem_map[i]) - 1;
566 }
567#else
568 for (i = 0; i < npmem_ranges; i++) {
569 int j;
570
571 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
572 struct page *p;
208d54e5 573 unsigned long flags;
1da177e4 574
208d54e5 575 pgdat_resize_lock(NODE_DATA(i), &flags);
408fde81 576 p = nid_page_nr(i, j) - node_start_pfn(i);
1da177e4
LT		 577
578 total++;
579 if (PageReserved(p))
580 reserved++;
581 else if (PageSwapCache(p))
582 cached++;
583 else if (!page_count(p))
584 free++;
585 else
586 shared += page_count(p) - 1;
208d54e5 587 pgdat_resize_unlock(NODE_DATA(i), &flags);
1da177e4
LT		 588 }
589 }
590#endif
591 printk(KERN_INFO "%d pages of RAM\n", total);
592 printk(KERN_INFO "%d reserved pages\n", reserved);
593 printk(KERN_INFO "%d pages shared\n", shared);
594 printk(KERN_INFO "%d pages swap cached\n", cached);
595
596
597#ifdef CONFIG_DISCONTIGMEM
598 {
599 struct zonelist *zl;
54a6eb5c 600 int i, j;
1da177e4
LT		 601
602 for (i = 0; i < npmem_ranges; i++) {
4413a0f6 603 zl = node_zonelist(i, 0);
1da177e4 604 for (j = 0; j < MAX_NR_ZONES; j++) {
dd1a239f 605 struct zoneref *z;
54a6eb5c 606 struct zone *zone;
1da177e4
LT		 607
608 printk("Zone list for zone %d on node %d: ", j, i);
54a6eb5c
MG		 609 for_each_zone_zonelist(zone, z, zl, j)
610 printk("[%d/%s] ", zone_to_nid(zone),
611 zone->name);
1da177e4
LT		 612 printk("\n");
613 }
614 }
615 }
616#endif
617}
618
619
620static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
621{
622 pgd_t *pg_dir;
623 pmd_t *pmd;
624 pte_t *pg_table;
625 unsigned long end_paddr;
626 unsigned long start_pmd;
627 unsigned long start_pte;
628 unsigned long tmp1;
629 unsigned long tmp2;
630 unsigned long address;
631 unsigned long ro_start;
632 unsigned long ro_end;
633 unsigned long fv_addr;
634 unsigned long gw_addr;
635 extern const unsigned long fault_vector_20;
636 extern void * const linux_gateway_page;
637
c51d476a 638 ro_start = __pa((unsigned long)_text);
1da177e4
LT		 639 ro_end = __pa((unsigned long)&data_start);
640 fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
641 gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
642
643 end_paddr = start_paddr + size;
644
645 pg_dir = pgd_offset_k(start_vaddr);
646
647#if PTRS_PER_PMD == 1
648 start_pmd = 0;
649#else
650 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
651#endif
652 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
653
654 address = start_paddr;
655 while (address < end_paddr) {
656#if PTRS_PER_PMD == 1
657 pmd = (pmd_t *)__pa(pg_dir);
658#else
659 pmd = (pmd_t *)pgd_address(*pg_dir);
660
661 /*
662 * pmd is physical at this point
663 */
664
665 if (!pmd) {
666 pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
667 pmd = (pmd_t *) __pa(pmd);
668 }
669
670 pgd_populate(NULL, pg_dir, __va(pmd));
671#endif
672 pg_dir++;
673
674 /* now change pmd to kernel virtual addresses */
675
676 pmd = (pmd_t *)__va(pmd) + start_pmd;
677 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
678
679 /*
680 * pg_table is physical at this point
681 */
682
683 pg_table = (pte_t *)pmd_address(*pmd);
684 if (!pg_table) {
685 pg_table = (pte_t *)
686 alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
687 pg_table = (pte_t *) __pa(pg_table);
688 }
689
690 pmd_populate_kernel(NULL, pmd, __va(pg_table));
691
692 /* now change pg_table to kernel virtual addresses */
693
694 pg_table = (pte_t *) __va(pg_table) + start_pte;
695 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
696 pte_t pte;
697
698 /*
699 * Map the fault vector writable so we can
700 * write the HPMC checksum.
701 */
2fd83038 702#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
1da177e4
LT		 703 if (address >= ro_start && address < ro_end
704 && address != fv_addr
705 && address != gw_addr)
706 pte = __mk_pte(address, PAGE_KERNEL_RO);
707 else
2fd83038 708#endif
1da177e4
LT		 709 pte = __mk_pte(address, pgprot);
710
711 if (address >= end_paddr)
712 pte_val(pte) = 0;
713
714 set_pte(pg_table, pte);
715
716 address += PAGE_SIZE;
717 }
718 start_pte = 0;
719
720 if (address >= end_paddr)
721 break;
722 }
723 start_pmd = 0;
724 }
725}
726
727/*
728 * pagetable_init() sets up the page tables
729 *
730 * Note that gateway_init() places the Linux gateway page at page 0.
731 * Since gateway pages cannot be dereferenced this has the desirable
732 * side effect of trapping those pesky NULL-reference errors in the
733 * kernel.
734 */
735static void __init pagetable_init(void)
736{
737 int range;
738
739 /* Map each physical memory range to its kernel vaddr */
740
741 for (range = 0; range < npmem_ranges; range++) {
742 unsigned long start_paddr;
743 unsigned long end_paddr;
744 unsigned long size;
745
746 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
747 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
748 size = pmem_ranges[range].pages << PAGE_SHIFT;
749
750 map_pages((unsigned long)__va(start_paddr), start_paddr,
751 size, PAGE_KERNEL);
752 }
753
754#ifdef CONFIG_BLK_DEV_INITRD
755 if (initrd_end && initrd_end > mem_limit) {
1bcdd854 756 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
1da177e4
LT		 757 map_pages(initrd_start, __pa(initrd_start),
758 initrd_end - initrd_start, PAGE_KERNEL);
759 }
760#endif
761
762 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
763 memset(empty_zero_page, 0, PAGE_SIZE);
764}
765
766static void __init gateway_init(void)
767{
768 unsigned long linux_gateway_page_addr;
769 /* FIXME: This is 'const' in order to trick the compiler
770 into not treating it as DP-relative data. */
771 extern void * const linux_gateway_page;
772
773 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
774
775 /*
776 * Setup Linux Gateway page.
777 *
778 * The Linux gateway page will reside in kernel space (on virtual
779 * page 0), so it doesn't need to be aliased into user space.
780 */
781
782 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
783 PAGE_SIZE, PAGE_GATEWAY);
784}
785
786#ifdef CONFIG_HPUX
787void
788map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
789{
790 pgd_t *pg_dir;
791 pmd_t *pmd;
792 pte_t *pg_table;
793 unsigned long start_pmd;
794 unsigned long start_pte;
795 unsigned long address;
796 unsigned long hpux_gw_page_addr;
797 /* FIXME: This is 'const' in order to trick the compiler
798 into not treating it as DP-relative data. */
799 extern void * const hpux_gateway_page;
800
801 hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
802
803 /*
804 * Setup HP-UX Gateway page.
805 *
806 * The HP-UX gateway page resides in the user address space,
807 * so it needs to be aliased into each process.
808 */
809
810 pg_dir = pgd_offset(mm,hpux_gw_page_addr);
811
812#if PTRS_PER_PMD == 1
813 start_pmd = 0;
814#else
815 start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
816#endif
817 start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
818
819 address = __pa(&hpux_gateway_page);
820#if PTRS_PER_PMD == 1
821 pmd = (pmd_t *)__pa(pg_dir);
822#else
823 pmd = (pmd_t *) pgd_address(*pg_dir);
824
825 /*
826 * pmd is physical at this point
827 */
828
829 if (!pmd) {
830 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
831 pmd = (pmd_t *) __pa(pmd);
832 }
833
834 __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
835#endif
836 /* now change pmd to kernel virtual addresses */
837
838 pmd = (pmd_t *)__va(pmd) + start_pmd;
839
840 /*
841 * pg_table is physical at this point
842 */
843
844 pg_table = (pte_t *) pmd_address(*pmd);
845 if (!pg_table)
846 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
847
848 __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
849
850 /* now change pg_table to kernel virtual addresses */
851
852 pg_table = (pte_t *) __va(pg_table) + start_pte;
853 set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
854}
855EXPORT_SYMBOL(map_hpux_gateway_page);
856#endif
857
1da177e4
LT		 858void __init paging_init(void)
859{
860 int i;
861
862 setup_bootmem();
863 pagetable_init();
864 gateway_init();
865 flush_cache_all_local(); /* start with known state */
ce33941f 866 flush_tlb_all_local(NULL);
1da177e4
LT		 867
868 for (i = 0; i < npmem_ranges; i++) {
f06a9684 869 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
1da177e4 870
00592837 871 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
1da177e4
LT		 872
873#ifdef CONFIG_DISCONTIGMEM
874 /* Need to initialize the pfnnid_map before we can initialize
875 the zone */
876 {
877 int j;
878 for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
879 j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
880 j++) {
881 pfnnid_map[j] = i;
882 }
883 }
884#endif
885
9109fb7b 886 free_area_init_node(i, zones_size,
1da177e4
LT		 887 pmem_ranges[i].start_pfn, NULL);
888 }
889}
890
891#ifdef CONFIG_PA20
892
893/*
7022672e 894 * Currently, all PA20 chips have 18 bit protection IDs, which is the
1da177e4
LT		 895 * limiting factor (space ids are 32 bits).
896 */
897
898#define NR_SPACE_IDS 262144
899
900#else
901
902/*
7022672e
SA		 903 * Currently we have a one-to-one relationship between space IDs and
904 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
905 * support 15 bit protection IDs, so that is the limiting factor.
906 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
1da177e4
LT		 907 * probably not worth the effort for a special case here.
908 */
909
910#define NR_SPACE_IDS 32768
911
912#endif /* !CONFIG_PA20 */
913
914#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
915#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
916
917static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
918static unsigned long dirty_space_id[SID_ARRAY_SIZE];
919static unsigned long space_id_index;
920static unsigned long free_space_ids = NR_SPACE_IDS - 1;
921static unsigned long dirty_space_ids = 0;
922
923static DEFINE_SPINLOCK(sid_lock);
924
925unsigned long alloc_sid(void)
926{
927 unsigned long index;
928
929 spin_lock(&sid_lock);
930
931 if (free_space_ids == 0) {
932 if (dirty_space_ids != 0) {
933 spin_unlock(&sid_lock);
934 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
935 spin_lock(&sid_lock);
936 }
2fd83038 937 BUG_ON(free_space_ids == 0);
1da177e4
LT		 938 }
939
940 free_space_ids--;
941
942 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
943 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
944 space_id_index = index;
945
946 spin_unlock(&sid_lock);
947
948 return index << SPACEID_SHIFT;
949}
950
951void free_sid(unsigned long spaceid)
952{
953 unsigned long index = spaceid >> SPACEID_SHIFT;
954 unsigned long *dirty_space_offset;
955
956 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
957 index &= (BITS_PER_LONG - 1);
958
959 spin_lock(&sid_lock);
960
2fd83038 961 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
1da177e4
LT		 962
963 *dirty_space_offset |= (1L << index);
964 dirty_space_ids++;
965
966 spin_unlock(&sid_lock);
967}
968
969
970#ifdef CONFIG_SMP
971static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
972{
973 int i;
974
975 /* NOTE: sid_lock must be held upon entry */
976
977 *ndirtyptr = dirty_space_ids;
978 if (dirty_space_ids != 0) {
979 for (i = 0; i < SID_ARRAY_SIZE; i++) {
980 dirty_array[i] = dirty_space_id[i];
981 dirty_space_id[i] = 0;
982 }
983 dirty_space_ids = 0;
984 }
985
986 return;
987}
988
989static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
990{
991 int i;
992
993 /* NOTE: sid_lock must be held upon entry */
994
995 if (ndirty != 0) {
996 for (i = 0; i < SID_ARRAY_SIZE; i++) {
997 space_id[i] ^= dirty_array[i];
998 }
999
1000 free_space_ids += ndirty;
1001 space_id_index = 0;
1002 }
1003}
1004
1005#else /* CONFIG_SMP */
1006
1007static void recycle_sids(void)
1008{
1009 int i;
1010
1011 /* NOTE: sid_lock must be held upon entry */
1012
1013 if (dirty_space_ids != 0) {
1014 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1015 space_id[i] ^= dirty_space_id[i];
1016 dirty_space_id[i] = 0;
1017 }
1018
1019 free_space_ids += dirty_space_ids;
1020 dirty_space_ids = 0;
1021 space_id_index = 0;
1022 }
1023}
1024#endif
1025
1026/*
1027 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
1028 * purged, we can safely reuse the space ids that were released but
1029 * not flushed from the tlb.
1030 */
1031
1032#ifdef CONFIG_SMP
1033
1034static unsigned long recycle_ndirty;
1035static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
2fd83038 1036static unsigned int recycle_inuse;
1da177e4
LT		 1037
1038void flush_tlb_all(void)
1039{
1040 int do_recycle;
1041
1042 do_recycle = 0;
1043 spin_lock(&sid_lock);
1044 if (dirty_space_ids > RECYCLE_THRESHOLD) {
2fd83038 1045 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
1da177e4
LT		 1046 get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
1047 recycle_inuse++;
1048 do_recycle++;
1049 }
1050 spin_unlock(&sid_lock);
15c8b6c1 1051 on_each_cpu(flush_tlb_all_local, NULL, 1);
1da177e4
LT		 1052 if (do_recycle) {
1053 spin_lock(&sid_lock);
1054 recycle_sids(recycle_ndirty,recycle_dirty_array);
1055 recycle_inuse = 0;
1056 spin_unlock(&sid_lock);
1057 }
1058}
1059#else
1060void flush_tlb_all(void)
1061{
1062 spin_lock(&sid_lock);
1b2425e3 1063 flush_tlb_all_local(NULL);
1da177e4
LT		 1064 recycle_sids();
1065 spin_unlock(&sid_lock);
1066}
1067#endif
1068
1069#ifdef CONFIG_BLK_DEV_INITRD
1070void free_initrd_mem(unsigned long start, unsigned long end)
1071{
94c3e87a
HD		 1072 if (start >= end)
1073 return;
1074 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1da177e4
LT		 1075 for (; start < end; start += PAGE_SIZE) {
1076 ClearPageReserved(virt_to_page(start));
7835e98b 1077 init_page_count(virt_to_page(start));
1da177e4
LT		 1078 free_page(start);
1079 num_physpages++;
1080 totalram_pages++;
1081 }
1da177e4
LT		 1082}
1083#endif
Linux 6.x block layer and io_uring tree(s)