blob: c5511294a9eef5106e1783759d74fd02b17d2b4f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2000 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
9 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
10 */
Ralf Baechleb8688682007-09-11 18:05:33 +010011#include <linux/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/signal.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/errno.h>
18#include <linux/string.h>
19#include <linux/types.h>
20#include <linux/pagemap.h>
21#include <linux/ptrace.h>
22#include <linux/mman.h>
23#include <linux/mm.h>
24#include <linux/bootmem.h>
25#include <linux/highmem.h>
26#include <linux/swap.h>
Daniel Jacobowitz3d503752005-01-20 19:59:54 -050027#include <linux/proc_fs.h>
Dave Hansen22a98352006-03-27 01:16:04 -080028#include <linux/pfn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Ralf Baechle9975e772007-08-13 12:44:41 +010030#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/bootinfo.h>
32#include <asm/cachectl.h>
33#include <asm/cpu.h>
34#include <asm/dma.h>
Ralf Baechlef8829ca2006-10-21 23:17:35 +010035#include <asm/kmap_types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/mmu_context.h>
37#include <asm/sections.h>
38#include <asm/pgtable.h>
39#include <asm/pgalloc.h>
40#include <asm/tlb.h>
Ralf Baechlef8829ca2006-10-21 23:17:35 +010041#include <asm/fixmap.h>
42
43/* Atomicity and interruptability */
44#ifdef CONFIG_MIPS_MT_SMTC
45
46#include <asm/mipsmtregs.h>
47
48#define ENTER_CRITICAL(flags) \
49 { \
50 unsigned int mvpflags; \
51 local_irq_save(flags);\
52 mvpflags = dvpe()
53#define EXIT_CRITICAL(flags) \
54 evpe(mvpflags); \
55 local_irq_restore(flags); \
56 }
57#else
58
59#define ENTER_CRITICAL(flags) local_irq_save(flags)
60#define EXIT_CRITICAL(flags) local_irq_restore(flags)
61
62#endif /* CONFIG_MIPS_MT_SMTC */
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066/*
67 * We have up to 8 empty zeroed pages so we can map one of the right colour
68 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
69 * where we have to avoid VCED / VECI exceptions for good performance at
70 * any price. Since page is never written to after the initialization we
71 * don't have to care about aliases on other CPUs.
72 */
73unsigned long empty_zero_page, zero_page_mask;
Ralf Baechle497d2ad2008-06-06 14:23:06 +010074EXPORT_SYMBOL_GPL(empty_zero_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76/*
77 * Not static inline because used by IP27 special magic initialization code
78 */
79unsigned long setup_zero_pages(void)
80{
Nick Piggin8dfcc9b2006-03-22 00:08:05 -080081 unsigned int order;
82 unsigned long size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 struct page *page;
84
85 if (cpu_has_vce)
86 order = 3;
87 else
88 order = 0;
89
90 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
91 if (!empty_zero_page)
92 panic("Oh boy, that early out of memory?");
93
Franck Bui-Huu99e3b942006-10-19 13:19:59 +020094 page = virt_to_page((void *)empty_zero_page);
Nick Piggin8dfcc9b2006-03-22 00:08:05 -080095 split_page(page, order);
Franck Bui-Huu99e3b942006-10-19 13:19:59 +020096 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
Hugh Dickins68352e62005-12-12 00:37:23 -080097 SetPageReserved(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 page++;
99 }
100
101 size = PAGE_SIZE << order;
102 zero_page_mask = (size - 1) & PAGE_MASK;
103
104 return 1UL << order;
105}
106
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100107#ifdef CONFIG_MIPS_MT_SMTC
108static pte_t *kmap_coherent_pte;
109static void __init kmap_coherent_init(void)
110{
111 unsigned long vaddr;
112
113 /* cache the first coherent kmap pte */
114 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
115 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
116}
117#else
118static inline void kmap_coherent_init(void) {}
119#endif
120
Ralf Baechle7575a492007-03-23 21:36:37 +0000121void *kmap_coherent(struct page *page, unsigned long addr)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100122{
123 enum fixed_addresses idx;
124 unsigned long vaddr, flags, entrylo;
125 unsigned long old_ctx;
126 pte_t pte;
127 int tlbidx;
128
Ralf Baechleb8688682007-09-11 18:05:33 +0100129 BUG_ON(Page_dcache_dirty(page));
130
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100131 inc_preempt_count();
132 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
133#ifdef CONFIG_MIPS_MT_SMTC
134 idx += FIX_N_COLOURS * smp_processor_id();
135#endif
136 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
137 pte = mk_pte(page, PAGE_KERNEL);
Chris Dearman962f4802007-09-19 00:46:32 +0100138#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100139 entrylo = pte.pte_high;
140#else
141 entrylo = pte_val(pte) >> 6;
142#endif
143
144 ENTER_CRITICAL(flags);
145 old_ctx = read_c0_entryhi();
146 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
147 write_c0_entrylo0(entrylo);
148 write_c0_entrylo1(entrylo);
149#ifdef CONFIG_MIPS_MT_SMTC
150 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
151 /* preload TLB instead of local_flush_tlb_one() */
152 mtc0_tlbw_hazard();
153 tlb_probe();
154 tlb_probe_hazard();
155 tlbidx = read_c0_index();
156 mtc0_tlbw_hazard();
157 if (tlbidx < 0)
158 tlb_write_random();
159 else
160 tlb_write_indexed();
161#else
162 tlbidx = read_c0_wired();
163 write_c0_wired(tlbidx + 1);
164 write_c0_index(tlbidx);
165 mtc0_tlbw_hazard();
166 tlb_write_indexed();
167#endif
168 tlbw_use_hazard();
169 write_c0_entryhi(old_ctx);
170 EXIT_CRITICAL(flags);
171
172 return (void*) vaddr;
173}
174
175#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
176
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100177void kunmap_coherent(void)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100178{
179#ifndef CONFIG_MIPS_MT_SMTC
180 unsigned int wired;
181 unsigned long flags, old_ctx;
182
183 ENTER_CRITICAL(flags);
184 old_ctx = read_c0_entryhi();
185 wired = read_c0_wired() - 1;
186 write_c0_wired(wired);
187 write_c0_index(wired);
188 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
189 write_c0_entrylo0(0);
190 write_c0_entrylo1(0);
191 mtc0_tlbw_hazard();
192 tlb_write_indexed();
193 tlbw_use_hazard();
194 write_c0_entryhi(old_ctx);
195 EXIT_CRITICAL(flags);
196#endif
197 dec_preempt_count();
198 preempt_check_resched();
199}
200
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000201void copy_user_highpage(struct page *to, struct page *from,
202 unsigned long vaddr, struct vm_area_struct *vma)
203{
204 void *vfrom, *vto;
205
206 vto = kmap_atomic(to, KM_USER1);
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000207 if (cpu_has_dc_aliases &&
208 page_mapped(from) && !Page_dcache_dirty(from)) {
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000209 vfrom = kmap_coherent(from, vaddr);
210 copy_page(vto, vfrom);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100211 kunmap_coherent();
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000212 } else {
213 vfrom = kmap_atomic(from, KM_USER0);
214 copy_page(vto, vfrom);
215 kunmap_atomic(vfrom, KM_USER0);
216 }
Ralf Baechle39b8d522008-04-28 17:14:26 +0100217 if ((!cpu_has_ic_fills_f_dc) ||
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000218 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
219 flush_data_cache_page((unsigned long)vto);
220 kunmap_atomic(vto, KM_USER1);
221 /* Make sure this page is cleared on other CPU's too before using it */
222 smp_wmb();
223}
224
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100225void copy_to_user_page(struct vm_area_struct *vma,
226 struct page *page, unsigned long vaddr, void *dst, const void *src,
227 unsigned long len)
228{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000229 if (cpu_has_dc_aliases &&
230 page_mapped(page) && !Page_dcache_dirty(page)) {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100231 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
232 memcpy(vto, src, len);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100233 kunmap_coherent();
Ralf Baechle985c30e2007-10-15 16:30:24 +0100234 } else {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100235 memcpy(dst, src, len);
Ralf Baechle985c30e2007-10-15 16:30:24 +0100236 if (cpu_has_dc_aliases)
237 SetPageDcacheDirty(page);
238 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100239 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
240 flush_cache_page(vma, vaddr, page_to_pfn(page));
241}
242
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100243void copy_from_user_page(struct vm_area_struct *vma,
244 struct page *page, unsigned long vaddr, void *dst, const void *src,
245 unsigned long len)
246{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000247 if (cpu_has_dc_aliases &&
248 page_mapped(page) && !Page_dcache_dirty(page)) {
Ralf Baechle985c30e2007-10-15 16:30:24 +0100249 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100250 memcpy(dst, vfrom, len);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100251 kunmap_coherent();
Ralf Baechle985c30e2007-10-15 16:30:24 +0100252 } else {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100253 memcpy(dst, src, len);
Ralf Baechle985c30e2007-10-15 16:30:24 +0100254 if (cpu_has_dc_aliases)
255 SetPageDcacheDirty(page);
256 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100257}
258
Ralf Baechle84fd0892005-02-07 16:13:07 +0000259void __init fixrange_init(unsigned long start, unsigned long end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 pgd_t *pgd_base)
261{
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100262#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 pgd_t *pgd;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000264 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 pmd_t *pmd;
266 pte_t *pte;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000267 int i, j, k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 unsigned long vaddr;
269
270 vaddr = start;
271 i = __pgd_offset(vaddr);
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000272 j = __pud_offset(vaddr);
273 k = __pmd_offset(vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 pgd = pgd_base + i;
275
276 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000277 pud = (pud_t *)pgd;
278 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
279 pmd = (pmd_t *)pud;
280 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
281 if (pmd_none(*pmd)) {
282 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100283 set_pmd(pmd, __pmd((unsigned long)pte));
Ralf Baechleb72b7092009-03-30 14:49:44 +0200284 BUG_ON(pte != pte_offset_kernel(pmd, 0));
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000285 }
286 vaddr += PMD_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 }
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000288 k = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 }
290 j = 0;
291 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100292#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700295#ifndef CONFIG_NEED_MULTIPLE_NODES
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900296static int __init page_is_ram(unsigned long pagenr)
297{
298 int i;
299
300 for (i = 0; i < boot_mem_map.nr_map; i++) {
301 unsigned long addr, end;
302
303 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
304 /* not usable memory */
305 continue;
306
307 addr = PFN_UP(boot_mem_map.map[i].addr);
308 end = PFN_DOWN(boot_mem_map.map[i].addr +
309 boot_mem_map.map[i].size);
310
311 if (pagenr >= addr && pagenr < end)
312 return 1;
313 }
314
315 return 0;
316}
317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318void __init paging_init(void)
319{
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000320 unsigned long max_zone_pfns[MAX_NR_ZONES];
321 unsigned long lastpfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 pagetable_init();
324
325#ifdef CONFIG_HIGHMEM
326 kmap_init();
327#endif
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100328 kmap_coherent_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Atsushi Nemoto05502332007-03-21 00:36:02 +0900330#ifdef CONFIG_ZONE_DMA
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000331 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332#endif
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000333#ifdef CONFIG_ZONE_DMA32
334 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
335#endif
336 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
337 lastpfn = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338#ifdef CONFIG_HIGHMEM
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000339 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
340 lastpfn = highend_pfn;
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100341
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000342 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100343 printk(KERN_WARNING "This processor doesn't support highmem."
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000344 " %ldk highmem ignored\n",
345 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
346 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
347 lastpfn = max_low_pfn;
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100348 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349#endif
350
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000351 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500354static struct kcore_list kcore_mem, kcore_vmalloc;
355#ifdef CONFIG_64BIT
356static struct kcore_list kcore_kseg0;
357#endif
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359void __init mem_init(void)
360{
361 unsigned long codesize, reservedpages, datasize, initsize;
362 unsigned long tmp, ram;
363
364#ifdef CONFIG_HIGHMEM
365#ifdef CONFIG_DISCONTIGMEM
366#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
367#endif
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900368 max_mapnr = highend_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369#else
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900370 max_mapnr = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371#endif
372 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
373
374 totalram_pages += free_all_bootmem();
375 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
376
377 reservedpages = ram = 0;
378 for (tmp = 0; tmp < max_low_pfn; tmp++)
379 if (page_is_ram(tmp)) {
380 ram++;
Chad Reeseb1c231f2006-05-30 17:16:49 -0700381 if (PageReserved(pfn_to_page(tmp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 reservedpages++;
383 }
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900384 num_physpages = ram;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386#ifdef CONFIG_HIGHMEM
387 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
Ralf Baechlea8049c52007-11-04 04:42:03 +0000388 struct page *page = pfn_to_page(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 if (!page_is_ram(tmp)) {
391 SetPageReserved(page);
392 continue;
393 }
394 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800395 init_page_count(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 __free_page(page);
397 totalhigh_pages++;
398 }
399 totalram_pages += totalhigh_pages;
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900400 num_physpages += totalhigh_pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401#endif
402
403 codesize = (unsigned long) &_etext - (unsigned long) &_text;
404 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
405 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
406
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500407#ifdef CONFIG_64BIT
408 if ((unsigned long) &_text > (unsigned long) CKSEG0)
409 /* The -4 is a hack so that user tools don't have to handle
410 the overflow. */
411 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
412#endif
413 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
414 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
415 VMALLOC_END-VMALLOC_START);
416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
418 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
419 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
420 ram << (PAGE_SHIFT-10),
421 codesize >> 10,
422 reservedpages << (PAGE_SHIFT-10),
423 datasize >> 10,
424 initsize >> 10,
425 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
426}
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700427#endif /* !CONFIG_NEED_MULTIPLE_NODES */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900429void free_init_pages(const char *what, unsigned long begin, unsigned long end)
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000430{
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200431 unsigned long pfn;
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000432
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200433 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
434 struct page *page = pfn_to_page(pfn);
435 void *addr = phys_to_virt(PFN_PHYS(pfn));
436
437 ClearPageReserved(page);
438 init_page_count(page);
439 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
440 __free_page(page);
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000441 totalram_pages++;
442 }
443 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
444}
445
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446#ifdef CONFIG_BLK_DEV_INITRD
447void free_initrd_mem(unsigned long start, unsigned long end)
448{
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200449 free_init_pages("initrd memory",
450 virt_to_phys((void *)start),
451 virt_to_phys((void *)end));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453#endif
454
Atsushi Nemotofb4bb132007-07-22 23:44:20 +0900455void __init_refok free_initmem(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900457 prom_free_prom_memory();
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200458 free_init_pages("unused kernel memory",
459 __pa_symbol(&__init_begin),
460 __pa_symbol(&__init_end));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461}
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900462
463unsigned long pgd_current[NR_CPUS];
464/*
465 * On 64-bit we've got three-level pagetables with a slightly
466 * different layout ...
467 */
468#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
Ralf Baechle9975e772007-08-13 12:44:41 +0100469
470/*
471 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
472 * are constants. So we use the variants from asm-offset.h until that gcc
473 * will officially be retired.
474 */
475pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900476#ifdef CONFIG_64BIT
477#ifdef MODULE_START
478pgd_t module_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
479#endif
480pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
481#endif
482pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);