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xtensa/mm: remove WANT_PAGE_VIRTUAL
[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
d9b41e0b
DR		 269 for (i = 0; i < npmem_ranges; i++) {
270 node_set_state(i, N_NORMAL_MEMORY);
1da177e4 271 node_set_online(i);
d9b41e0b 272 }
1da177e4
LT		 273#endif
274
275 /*
276 * Initialize and free the full range of memory in each range.
277 * Note that the only writing these routines do are to the bootmap,
278 * and we've made sure to locate the bootmap properly so that they
279 * won't be writing over anything important.
280 */
281
282 bootmap_pfn = bootmap_start_pfn;
283 max_pfn = 0;
284 for (i = 0; i < npmem_ranges; i++) {
285 unsigned long start_pfn;
286 unsigned long npages;
287
288 start_pfn = pmem_ranges[i].start_pfn;
289 npages = pmem_ranges[i].pages;
290
291 bootmap_size = init_bootmem_node(NODE_DATA(i),
292 bootmap_pfn,
293 start_pfn,
294 (start_pfn + npages) );
295 free_bootmem_node(NODE_DATA(i),
296 (start_pfn << PAGE_SHIFT),
297 (npages << PAGE_SHIFT) );
298 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
299 if ((start_pfn + npages) > max_pfn)
300 max_pfn = start_pfn + npages;
301 }
302
5cdb8205
GG		 303 /* IOMMU is always used to access "high mem" on those boxes
304 * that can support enough mem that a PCI device couldn't
305 * directly DMA to any physical addresses.
306 * ISA DMA support will need to revisit this.
307 */
308 max_low_pfn = max_pfn;
309
8980a7ba
HD		 310 /* bootmap sizing messed up? */
311 BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
1da177e4
LT		 312
313 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
314
315#define PDC_CONSOLE_IO_IODC_SIZE 32768
316
317 reserve_bootmem_node(NODE_DATA(0), 0UL,
72a7fe39
BW		 318 (unsigned long)(PAGE0->mem_free +
319 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
c51d476a 320 reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
72a7fe39 321 (unsigned long)(_end - _text), BOOTMEM_DEFAULT);
1da177e4 322 reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
72a7fe39
BW		 323 ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
324 BOOTMEM_DEFAULT);
1da177e4
LT		 325
326#ifndef CONFIG_DISCONTIGMEM
327
328 /* reserve the holes */
329
330 for (i = 0; i < npmem_holes; i++) {
331 reserve_bootmem_node(NODE_DATA(0),
332 (pmem_holes[i].start_pfn << PAGE_SHIFT),
72a7fe39
BW		 333 (pmem_holes[i].pages << PAGE_SHIFT),
334 BOOTMEM_DEFAULT);
1da177e4
LT		 335 }
336#endif
337
338#ifdef CONFIG_BLK_DEV_INITRD
339 if (initrd_start) {
340 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
341 if (__pa(initrd_start) < mem_max) {
342 unsigned long initrd_reserve;
343
344 if (__pa(initrd_end) > mem_max) {
345 initrd_reserve = mem_max - __pa(initrd_start);
346 } else {
347 initrd_reserve = initrd_end - initrd_start;
348 }
349 initrd_below_start_ok = 1;
350 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
351
72a7fe39
BW		 352 reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
353 initrd_reserve, BOOTMEM_DEFAULT);
1da177e4
LT		 354 }
355 }
356#endif
357
358 data_resource.start = virt_to_phys(&data_start);
c51d476a
KM		 359 data_resource.end = virt_to_phys(_end) - 1;
360 code_resource.start = virt_to_phys(_text);
1da177e4
LT		 361 code_resource.end = virt_to_phys(&data_start)-1;
362
363 /* We don't know which region the kernel will be in, so try
364 * all of them.
365 */
366 for (i = 0; i < sysram_resource_count; i++) {
367 struct resource *res = &sysram_resources[i];
368 request_resource(res, &code_resource);
369 request_resource(res, &data_resource);
370 }
371 request_resource(&sysram_resources[0], &pdcdata_resource);
372}
373
d7dd2ff1
JB		 374static void __init map_pages(unsigned long start_vaddr,
375 unsigned long start_paddr, unsigned long size,
376 pgprot_t pgprot, int force)
377{
378 pgd_t *pg_dir;
379 pmd_t *pmd;
380 pte_t *pg_table;
381 unsigned long end_paddr;
382 unsigned long start_pmd;
383 unsigned long start_pte;
384 unsigned long tmp1;
385 unsigned long tmp2;
386 unsigned long address;
387 unsigned long vaddr;
388 unsigned long ro_start;
389 unsigned long ro_end;
390 unsigned long fv_addr;
391 unsigned long gw_addr;
392 extern const unsigned long fault_vector_20;
393 extern void * const linux_gateway_page;
394
395 ro_start = __pa((unsigned long)_text);
396 ro_end = __pa((unsigned long)&data_start);
397 fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
398 gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
399
400 end_paddr = start_paddr + size;
401
402 pg_dir = pgd_offset_k(start_vaddr);
403
404#if PTRS_PER_PMD == 1
405 start_pmd = 0;
406#else
407 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
408#endif
409 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
410
411 address = start_paddr;
412 vaddr = start_vaddr;
413 while (address < end_paddr) {
414#if PTRS_PER_PMD == 1
415 pmd = (pmd_t *)__pa(pg_dir);
416#else
417 pmd = (pmd_t *)pgd_address(*pg_dir);
418
419 /*
420 * pmd is physical at this point
421 */
422
423 if (!pmd) {
424 pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER);
425 pmd = (pmd_t *) __pa(pmd);
426 }
427
428 pgd_populate(NULL, pg_dir, __va(pmd));
429#endif
430 pg_dir++;
431
432 /* now change pmd to kernel virtual addresses */
433
434 pmd = (pmd_t *)__va(pmd) + start_pmd;
435 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
436
437 /*
438 * pg_table is physical at this point
439 */
440
441 pg_table = (pte_t *)pmd_address(*pmd);
442 if (!pg_table) {
443 pg_table = (pte_t *)
444 alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE);
445 pg_table = (pte_t *) __pa(pg_table);
446 }
447
448 pmd_populate_kernel(NULL, pmd, __va(pg_table));
449
450 /* now change pg_table to kernel virtual addresses */
451
452 pg_table = (pte_t *) __va(pg_table) + start_pte;
453 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
454 pte_t pte;
455
456 /*
457 * Map the fault vector writable so we can
458 * write the HPMC checksum.
459 */
460 if (force)
461 pte = __mk_pte(address, pgprot);
462 else if (core_kernel_text(vaddr) &&
463 address != fv_addr)
464 pte = __mk_pte(address, PAGE_KERNEL_EXEC);
465 else
466#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
467 if (address >= ro_start && address < ro_end
468 && address != fv_addr
469 && address != gw_addr)
470 pte = __mk_pte(address, PAGE_KERNEL_RO);
471 else
472#endif
473 pte = __mk_pte(address, pgprot);
474
475 if (address >= end_paddr) {
476 if (force)
477 break;
478 else
479 pte_val(pte) = 0;
480 }
481
482 set_pte(pg_table, pte);
483
484 address += PAGE_SIZE;
485 vaddr += PAGE_SIZE;
486 }
487 start_pte = 0;
488
489 if (address >= end_paddr)
490 break;
491 }
492 start_pmd = 0;
493 }
494}
495
1da177e4
LT		 496void free_initmem(void)
497{
4fb11781
KM		 498 unsigned long addr;
499 unsigned long init_begin = (unsigned long)__init_begin;
500 unsigned long init_end = (unsigned long)__init_end;
1da177e4 501
d7dd2ff1
JB		 502 /* The init text pages are marked R-X. We have to
503 * flush the icache and mark them RW-
504 *
505 * This is tricky, because map_pages is in the init section.
506 * Do a dummy remap of the data section first (the data
507 * section is already PAGE_KERNEL) to pull in the TLB entries
508 * for map_kernel */
509 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
510 PAGE_KERNEL_RWX, 1);
511 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
512 * map_pages */
513 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
514 PAGE_KERNEL, 1);
515
516 /* force the kernel to see the new TLB entries */
517 __flush_tlb_range(0, init_begin, init_end);
1da177e4
LT		 518 /* Attempt to catch anyone trying to execute code here
519 * by filling the page with BRK insns.
1da177e4 520 */
20dbc9f7 521 memset((void *)init_begin, 0x00, init_end - init_begin);
d7dd2ff1
JB		 522 /* finally dump all the instructions which were cached, since the
523 * pages are no-longer executable */
4fb11781 524 flush_icache_range(init_begin, init_end);
1da177e4 525
2fd83038 526 for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
1da177e4 527 ClearPageReserved(virt_to_page(addr));
7835e98b 528 init_page_count(virt_to_page(addr));
1da177e4
LT		 529 free_page(addr);
530 num_physpages++;
531 totalram_pages++;
532 }
533
534 /* set up a new led state on systems shipped LED State panel */
535 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
536
4fb11781
KM		 537 printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n",
538 (init_end - init_begin) >> 10);
1da177e4
LT		 539}
540
1bcdd854
HD		 541
542#ifdef CONFIG_DEBUG_RODATA
543void mark_rodata_ro(void)
544{
1bcdd854
HD		 545 /* rodata memory was already mapped with KERNEL_RO access rights by
546 pagetable_init() and map_pages(). No need to do additional stuff here */
547 printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
a581c2a4 548 (unsigned long)(__end_rodata - __start_rodata) >> 10);
1bcdd854
HD		 549}
550#endif
551
552
1da177e4
LT		 553/*
554 * Just an arbitrary offset to serve as a "hole" between mapping areas
555 * (between top of physical memory and a potential pcxl dma mapping
556 * area, and below the vmalloc mapping area).
557 *
558 * The current 32K value just means that there will be a 32K "hole"
559 * between mapping areas. That means that any out-of-bounds memory
560 * accesses will hopefully be caught. The vmalloc() routines leaves
561 * a hole of 4kB between each vmalloced area for the same reason.
562 */
563
564 /* Leave room for gateway page expansion */
565#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
566#error KERNEL_MAP_START is in gateway reserved region
567#endif
568#define MAP_START (KERNEL_MAP_START)
569
570#define VM_MAP_OFFSET (32*1024)
571#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
572 & ~(VM_MAP_OFFSET-1)))
573
4255f0d2
HD		 574void *parisc_vmalloc_start __read_mostly;
575EXPORT_SYMBOL(parisc_vmalloc_start);
1da177e4
LT		 576
577#ifdef CONFIG_PA11
8039de10 578unsigned long pcxl_dma_start __read_mostly;
1da177e4
LT		 579#endif
580
581void __init mem_init(void)
582{
ce8420bb 583 int codesize, reservedpages, datasize, initsize;
ce8420bb 584
48d27cb2
HD		 585 /* Do sanity checks on page table constants */
586 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
587 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
588 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
589 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
590 > BITS_PER_LONG);
591
1da177e4
LT		 592 high_memory = __va((max_pfn << PAGE_SHIFT));
593
594#ifndef CONFIG_DISCONTIGMEM
595 max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
596 totalram_pages += free_all_bootmem();
597#else
598 {
599 int i;
600
601 for (i = 0; i < npmem_ranges; i++)
602 totalram_pages += free_all_bootmem_node(NODE_DATA(i));
603 }
604#endif
605
53faf291
KM		 606 codesize = (unsigned long)_etext - (unsigned long)_text;
607 datasize = (unsigned long)_edata - (unsigned long)_etext;
608 initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
ce8420bb
HD		 609
610 reservedpages = 0;
53faf291
KM		 611{
612 unsigned long pfn;
613#ifdef CONFIG_DISCONTIGMEM
614 int i;
615
616 for (i = 0; i < npmem_ranges; i++) {
617 for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
618 if (PageReserved(pfn_to_page(pfn)))
619 reservedpages++;
620 }
621 }
622#else /* !CONFIG_DISCONTIGMEM */
623 for (pfn = 0; pfn < max_pfn; pfn++) {
ce8420bb
HD		 624 /*
625 * Only count reserved RAM pages
626 */
53faf291 627 if (PageReserved(pfn_to_page(pfn)))
ce8420bb 628 reservedpages++;
53faf291
KM		 629 }
630#endif
631}
1da177e4
LT		 632
633#ifdef CONFIG_PA11
634 if (hppa_dma_ops == &pcxl_dma_ops) {
635 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
4255f0d2
HD		 636 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
637 + PCXL_DMA_MAP_SIZE);
1da177e4
LT		 638 } else {
639 pcxl_dma_start = 0;
4255f0d2 640 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
1da177e4
LT		 641 }
642#else
4255f0d2 643 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
1da177e4
LT		 644#endif
645
53faf291 646 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
cc013a88 647 nr_free_pages() << (PAGE_SHIFT-10),
ce8420bb
HD		 648 num_physpages << (PAGE_SHIFT-10),
649 codesize >> 10,
650 reservedpages << (PAGE_SHIFT-10),
651 datasize >> 10,
53faf291
KM		 652 initsize >> 10
653 );
ce8420bb
HD		 654
655#ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
656 printk("virtual kernel memory layout:\n"
657 " vmalloc : 0x%p - 0x%p (%4ld MB)\n"
53faf291 658 " memory : 0x%p - 0x%p (%4ld MB)\n"
ce8420bb
HD		 659 " .init : 0x%p - 0x%p (%4ld kB)\n"
660 " .data : 0x%p - 0x%p (%4ld kB)\n"
661 " .text : 0x%p - 0x%p (%4ld kB)\n",
662
663 (void*)VMALLOC_START, (void*)VMALLOC_END,
664 (VMALLOC_END - VMALLOC_START) >> 20,
665
666 __va(0), high_memory,
667 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
668
53faf291
KM		 669 __init_begin, __init_end,
670 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
ce8420bb 671
53faf291
KM		 672 _etext, _edata,
673 ((unsigned long)_edata - (unsigned long)_etext) >> 10,
ce8420bb 674
53faf291
KM		 675 _text, _etext,
676 ((unsigned long)_etext - (unsigned long)_text) >> 10);
ce8420bb 677#endif
1da177e4
LT		 678}
679
8039de10 680unsigned long *empty_zero_page __read_mostly;
22febf1f 681EXPORT_SYMBOL(empty_zero_page);
1da177e4 682
b2b755b5 683void show_mem(unsigned int filter)
1da177e4
LT		 684{
685 int i,free = 0,total = 0,reserved = 0;
686 int shared = 0, cached = 0;
687
688 printk(KERN_INFO "Mem-info:\n");
689 show_free_areas();
1da177e4
LT		 690#ifndef CONFIG_DISCONTIGMEM
691 i = max_mapnr;
692 while (i-- > 0) {
693 total++;
694 if (PageReserved(mem_map+i))
695 reserved++;
696 else if (PageSwapCache(mem_map+i))
697 cached++;
698 else if (!page_count(&mem_map[i]))
699 free++;
700 else
701 shared += page_count(&mem_map[i]) - 1;
702 }
703#else
704 for (i = 0; i < npmem_ranges; i++) {
705 int j;
706
707 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
708 struct page *p;
208d54e5 709 unsigned long flags;
1da177e4 710
208d54e5 711 pgdat_resize_lock(NODE_DATA(i), &flags);
408fde81 712 p = nid_page_nr(i, j) - node_start_pfn(i);
1da177e4
LT		 713
714 total++;
715 if (PageReserved(p))
716 reserved++;
717 else if (PageSwapCache(p))
718 cached++;
719 else if (!page_count(p))
720 free++;
721 else
722 shared += page_count(p) - 1;
208d54e5 723 pgdat_resize_unlock(NODE_DATA(i), &flags);
1da177e4
LT		 724 }
725 }
726#endif
727 printk(KERN_INFO "%d pages of RAM\n", total);
728 printk(KERN_INFO "%d reserved pages\n", reserved);
729 printk(KERN_INFO "%d pages shared\n", shared);
730 printk(KERN_INFO "%d pages swap cached\n", cached);
731
732
733#ifdef CONFIG_DISCONTIGMEM
734 {
735 struct zonelist *zl;
54a6eb5c 736 int i, j;
1da177e4
LT		 737
738 for (i = 0; i < npmem_ranges; i++) {
4413a0f6 739 zl = node_zonelist(i, 0);
1da177e4 740 for (j = 0; j < MAX_NR_ZONES; j++) {
dd1a239f 741 struct zoneref *z;
54a6eb5c 742 struct zone *zone;
1da177e4
LT		 743
744 printk("Zone list for zone %d on node %d: ", j, i);
54a6eb5c
MG		 745 for_each_zone_zonelist(zone, z, zl, j)
746 printk("[%d/%s] ", zone_to_nid(zone),
747 zone->name);
1da177e4
LT		 748 printk("\n");
749 }
750 }
751 }
752#endif
753}
754
1da177e4
LT		 755/*
756 * pagetable_init() sets up the page tables
757 *
758 * Note that gateway_init() places the Linux gateway page at page 0.
759 * Since gateway pages cannot be dereferenced this has the desirable
760 * side effect of trapping those pesky NULL-reference errors in the
761 * kernel.
762 */
763static void __init pagetable_init(void)
764{
765 int range;
766
767 /* Map each physical memory range to its kernel vaddr */
768
769 for (range = 0; range < npmem_ranges; range++) {
770 unsigned long start_paddr;
771 unsigned long end_paddr;
772 unsigned long size;
773
774 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
775 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
776 size = pmem_ranges[range].pages << PAGE_SHIFT;
777
778 map_pages((unsigned long)__va(start_paddr), start_paddr,
d7dd2ff1 779 size, PAGE_KERNEL, 0);
1da177e4
LT		 780 }
781
782#ifdef CONFIG_BLK_DEV_INITRD
783 if (initrd_end && initrd_end > mem_limit) {
1bcdd854 784 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
1da177e4 785 map_pages(initrd_start, __pa(initrd_start),
d7dd2ff1 786 initrd_end - initrd_start, PAGE_KERNEL, 0);
1da177e4
LT		 787 }
788#endif
789
790 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
791 memset(empty_zero_page, 0, PAGE_SIZE);
792}
793
794static void __init gateway_init(void)
795{
796 unsigned long linux_gateway_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 linux_gateway_page;
800
801 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
802
803 /*
804 * Setup Linux Gateway page.
805 *
806 * The Linux gateway page will reside in kernel space (on virtual
807 * page 0), so it doesn't need to be aliased into user space.
808 */
809
810 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
d7dd2ff1 811 PAGE_SIZE, PAGE_GATEWAY, 1);
1da177e4
LT		 812}
813
814#ifdef CONFIG_HPUX
815void
816map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
817{
818 pgd_t *pg_dir;
819 pmd_t *pmd;
820 pte_t *pg_table;
821 unsigned long start_pmd;
822 unsigned long start_pte;
823 unsigned long address;
824 unsigned long hpux_gw_page_addr;
825 /* FIXME: This is 'const' in order to trick the compiler
826 into not treating it as DP-relative data. */
827 extern void * const hpux_gateway_page;
828
829 hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
830
831 /*
832 * Setup HP-UX Gateway page.
833 *
834 * The HP-UX gateway page resides in the user address space,
835 * so it needs to be aliased into each process.
836 */
837
838 pg_dir = pgd_offset(mm,hpux_gw_page_addr);
839
840#if PTRS_PER_PMD == 1
841 start_pmd = 0;
842#else
843 start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
844#endif
845 start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
846
847 address = __pa(&hpux_gateway_page);
848#if PTRS_PER_PMD == 1
849 pmd = (pmd_t *)__pa(pg_dir);
850#else
851 pmd = (pmd_t *) pgd_address(*pg_dir);
852
853 /*
854 * pmd is physical at this point
855 */
856
857 if (!pmd) {
858 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
859 pmd = (pmd_t *) __pa(pmd);
860 }
861
862 __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
863#endif
864 /* now change pmd to kernel virtual addresses */
865
866 pmd = (pmd_t *)__va(pmd) + start_pmd;
867
868 /*
869 * pg_table is physical at this point
870 */
871
872 pg_table = (pte_t *) pmd_address(*pmd);
873 if (!pg_table)
874 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
875
876 __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
877
878 /* now change pg_table to kernel virtual addresses */
879
880 pg_table = (pte_t *) __va(pg_table) + start_pte;
881 set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
882}
883EXPORT_SYMBOL(map_hpux_gateway_page);
884#endif
885
1da177e4
LT		 886void __init paging_init(void)
887{
888 int i;
889
890 setup_bootmem();
891 pagetable_init();
892 gateway_init();
893 flush_cache_all_local(); /* start with known state */
ce33941f 894 flush_tlb_all_local(NULL);
1da177e4
LT		 895
896 for (i = 0; i < npmem_ranges; i++) {
f06a9684 897 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
1da177e4 898
00592837 899 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
1da177e4
LT		 900
901#ifdef CONFIG_DISCONTIGMEM
902 /* Need to initialize the pfnnid_map before we can initialize
903 the zone */
904 {
905 int j;
906 for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
907 j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
908 j++) {
909 pfnnid_map[j] = i;
910 }
911 }
912#endif
913
9109fb7b 914 free_area_init_node(i, zones_size,
1da177e4
LT		 915 pmem_ranges[i].start_pfn, NULL);
916 }
917}
918
919#ifdef CONFIG_PA20
920
921/*
7022672e 922 * Currently, all PA20 chips have 18 bit protection IDs, which is the
1da177e4
LT		 923 * limiting factor (space ids are 32 bits).
924 */
925
926#define NR_SPACE_IDS 262144
927
928#else
929
930/*
7022672e
SA		 931 * Currently we have a one-to-one relationship between space IDs and
932 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
933 * support 15 bit protection IDs, so that is the limiting factor.
934 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
1da177e4
LT		 935 * probably not worth the effort for a special case here.
936 */
937
938#define NR_SPACE_IDS 32768
939
940#endif /* !CONFIG_PA20 */
941
942#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
943#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
944
945static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
946static unsigned long dirty_space_id[SID_ARRAY_SIZE];
947static unsigned long space_id_index;
948static unsigned long free_space_ids = NR_SPACE_IDS - 1;
949static unsigned long dirty_space_ids = 0;
950
951static DEFINE_SPINLOCK(sid_lock);
952
953unsigned long alloc_sid(void)
954{
955 unsigned long index;
956
957 spin_lock(&sid_lock);
958
959 if (free_space_ids == 0) {
960 if (dirty_space_ids != 0) {
961 spin_unlock(&sid_lock);
962 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
963 spin_lock(&sid_lock);
964 }
2fd83038 965 BUG_ON(free_space_ids == 0);
1da177e4
LT		 966 }
967
968 free_space_ids--;
969
970 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
971 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
972 space_id_index = index;
973
974 spin_unlock(&sid_lock);
975
976 return index << SPACEID_SHIFT;
977}
978
979void free_sid(unsigned long spaceid)
980{
981 unsigned long index = spaceid >> SPACEID_SHIFT;
982 unsigned long *dirty_space_offset;
983
984 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
985 index &= (BITS_PER_LONG - 1);
986
987 spin_lock(&sid_lock);
988
2fd83038 989 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
1da177e4
LT		 990
991 *dirty_space_offset |= (1L << index);
992 dirty_space_ids++;
993
994 spin_unlock(&sid_lock);
995}
996
997
998#ifdef CONFIG_SMP
999static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
1000{
1001 int i;
1002
1003 /* NOTE: sid_lock must be held upon entry */
1004
1005 *ndirtyptr = dirty_space_ids;
1006 if (dirty_space_ids != 0) {
1007 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1008 dirty_array[i] = dirty_space_id[i];
1009 dirty_space_id[i] = 0;
1010 }
1011 dirty_space_ids = 0;
1012 }
1013
1014 return;
1015}
1016
1017static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
1018{
1019 int i;
1020
1021 /* NOTE: sid_lock must be held upon entry */
1022
1023 if (ndirty != 0) {
1024 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1025 space_id[i] ^= dirty_array[i];
1026 }
1027
1028 free_space_ids += ndirty;
1029 space_id_index = 0;
1030 }
1031}
1032
1033#else /* CONFIG_SMP */
1034
1035static void recycle_sids(void)
1036{
1037 int i;
1038
1039 /* NOTE: sid_lock must be held upon entry */
1040
1041 if (dirty_space_ids != 0) {
1042 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1043 space_id[i] ^= dirty_space_id[i];
1044 dirty_space_id[i] = 0;
1045 }
1046
1047 free_space_ids += dirty_space_ids;
1048 dirty_space_ids = 0;
1049 space_id_index = 0;
1050 }
1051}
1052#endif
1053
1054/*
1055 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
1056 * purged, we can safely reuse the space ids that were released but
1057 * not flushed from the tlb.
1058 */
1059
1060#ifdef CONFIG_SMP
1061
1062static unsigned long recycle_ndirty;
1063static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
2fd83038 1064static unsigned int recycle_inuse;
1da177e4
LT		 1065
1066void flush_tlb_all(void)
1067{
1068 int do_recycle;
1069
1070 do_recycle = 0;
1071 spin_lock(&sid_lock);
1072 if (dirty_space_ids > RECYCLE_THRESHOLD) {
2fd83038 1073 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
1da177e4
LT		 1074 get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
1075 recycle_inuse++;
1076 do_recycle++;
1077 }
1078 spin_unlock(&sid_lock);
15c8b6c1 1079 on_each_cpu(flush_tlb_all_local, NULL, 1);
1da177e4
LT		 1080 if (do_recycle) {
1081 spin_lock(&sid_lock);
1082 recycle_sids(recycle_ndirty,recycle_dirty_array);
1083 recycle_inuse = 0;
1084 spin_unlock(&sid_lock);
1085 }
1086}
1087#else
1088void flush_tlb_all(void)
1089{
1090 spin_lock(&sid_lock);
1b2425e3 1091 flush_tlb_all_local(NULL);
1da177e4
LT		 1092 recycle_sids();
1093 spin_unlock(&sid_lock);
1094}
1095#endif
1096
1097#ifdef CONFIG_BLK_DEV_INITRD
1098void free_initrd_mem(unsigned long start, unsigned long end)
1099{
94c3e87a
HD		 1100 if (start >= end)
1101 return;
1102 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1da177e4
LT		 1103 for (; start < end; start += PAGE_SIZE) {
1104 ClearPageReserved(virt_to_page(start));
7835e98b 1105 init_page_count(virt_to_page(start));
1da177e4
LT		 1106 free_page(start);
1107 num_physpages++;
1108 totalram_pages++;
1109 }
1da177e4
LT		 1110}
1111#endif
Linux 6.x block layer and io_uring tree(s)