blob: 1a85ba92eb5c274aaf7d96020bc34b6d7338ea27 [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>
Ralf Baechle631330f2009-06-19 14:05:26 +010016#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/string.h>
20#include <linux/types.h>
21#include <linux/pagemap.h>
22#include <linux/ptrace.h>
23#include <linux/mman.h>
24#include <linux/mm.h>
25#include <linux/bootmem.h>
26#include <linux/highmem.h>
27#include <linux/swap.h>
Daniel Jacobowitz3d503752005-01-20 19:59:54 -050028#include <linux/proc_fs.h>
Dave Hansen22a98352006-03-27 01:16:04 -080029#include <linux/pfn.h>
Kevin Cernekee0f334a32009-09-07 11:11:31 -070030#include <linux/hardirq.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Ralf Baechle9975e772007-08-13 12:44:41 +010033#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/bootinfo.h>
35#include <asm/cachectl.h>
36#include <asm/cpu.h>
37#include <asm/dma.h>
Ralf Baechlef8829ca2006-10-21 23:17:35 +010038#include <asm/kmap_types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/mmu_context.h>
40#include <asm/sections.h>
41#include <asm/pgtable.h>
42#include <asm/pgalloc.h>
43#include <asm/tlb.h>
Ralf Baechlef8829ca2006-10-21 23:17:35 +010044#include <asm/fixmap.h>
45
46/* Atomicity and interruptability */
47#ifdef CONFIG_MIPS_MT_SMTC
48
49#include <asm/mipsmtregs.h>
50
51#define ENTER_CRITICAL(flags) \
52 { \
53 unsigned int mvpflags; \
54 local_irq_save(flags);\
55 mvpflags = dvpe()
56#define EXIT_CRITICAL(flags) \
57 evpe(mvpflags); \
58 local_irq_restore(flags); \
59 }
60#else
61
62#define ENTER_CRITICAL(flags) local_irq_save(flags)
63#define EXIT_CRITICAL(flags) local_irq_restore(flags)
64
65#endif /* CONFIG_MIPS_MT_SMTC */
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Linus Torvalds1da177e2005-04-16 15:20:36 -070067/*
68 * We have up to 8 empty zeroed pages so we can map one of the right colour
69 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
70 * where we have to avoid VCED / VECI exceptions for good performance at
71 * any price. Since page is never written to after the initialization we
72 * don't have to care about aliases on other CPUs.
73 */
74unsigned long empty_zero_page, zero_page_mask;
Ralf Baechle497d2ad2008-06-06 14:23:06 +010075EXPORT_SYMBOL_GPL(empty_zero_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77/*
78 * Not static inline because used by IP27 special magic initialization code
79 */
80unsigned long setup_zero_pages(void)
81{
Nick Piggin8dfcc9b2006-03-22 00:08:05 -080082 unsigned int order;
83 unsigned long size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 struct page *page;
85
86 if (cpu_has_vce)
87 order = 3;
88 else
89 order = 0;
90
91 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
92 if (!empty_zero_page)
93 panic("Oh boy, that early out of memory?");
94
Franck Bui-Huu99e3b942006-10-19 13:19:59 +020095 page = virt_to_page((void *)empty_zero_page);
Nick Piggin8dfcc9b2006-03-22 00:08:05 -080096 split_page(page, order);
Franck Bui-Huu99e3b942006-10-19 13:19:59 +020097 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
Hugh Dickins68352e62005-12-12 00:37:23 -080098 SetPageReserved(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 page++;
100 }
101
102 size = PAGE_SIZE << order;
103 zero_page_mask = (size - 1) & PAGE_MASK;
104
105 return 1UL << order;
106}
107
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100108#ifdef CONFIG_MIPS_MT_SMTC
109static pte_t *kmap_coherent_pte;
110static void __init kmap_coherent_init(void)
111{
112 unsigned long vaddr;
113
114 /* cache the first coherent kmap pte */
115 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
116 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
117}
118#else
119static inline void kmap_coherent_init(void) {}
120#endif
121
Ralf Baechle7575a492007-03-23 21:36:37 +0000122void *kmap_coherent(struct page *page, unsigned long addr)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100123{
124 enum fixed_addresses idx;
125 unsigned long vaddr, flags, entrylo;
126 unsigned long old_ctx;
127 pte_t pte;
128 int tlbidx;
129
Ralf Baechleb8688682007-09-11 18:05:33 +0100130 BUG_ON(Page_dcache_dirty(page));
131
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100132 inc_preempt_count();
133 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
134#ifdef CONFIG_MIPS_MT_SMTC
Kevin Cernekee0f334a32009-09-07 11:11:31 -0700135 idx += FIX_N_COLOURS * smp_processor_id() +
136 (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
137#else
138 idx += in_interrupt() ? FIX_N_COLOURS : 0;
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100139#endif
140 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
141 pte = mk_pte(page, PAGE_KERNEL);
Chris Dearman962f4802007-09-19 00:46:32 +0100142#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100143 entrylo = pte.pte_high;
144#else
David Daney6dd93442010-02-10 15:12:47 -0800145 entrylo = pte_to_entrylo(pte_val(pte));
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100146#endif
147
148 ENTER_CRITICAL(flags);
149 old_ctx = read_c0_entryhi();
150 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
151 write_c0_entrylo0(entrylo);
152 write_c0_entrylo1(entrylo);
153#ifdef CONFIG_MIPS_MT_SMTC
154 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
155 /* preload TLB instead of local_flush_tlb_one() */
156 mtc0_tlbw_hazard();
157 tlb_probe();
158 tlb_probe_hazard();
159 tlbidx = read_c0_index();
160 mtc0_tlbw_hazard();
161 if (tlbidx < 0)
162 tlb_write_random();
163 else
164 tlb_write_indexed();
165#else
166 tlbidx = read_c0_wired();
167 write_c0_wired(tlbidx + 1);
168 write_c0_index(tlbidx);
169 mtc0_tlbw_hazard();
170 tlb_write_indexed();
171#endif
172 tlbw_use_hazard();
173 write_c0_entryhi(old_ctx);
174 EXIT_CRITICAL(flags);
175
176 return (void*) vaddr;
177}
178
179#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
180
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100181void kunmap_coherent(void)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100182{
183#ifndef CONFIG_MIPS_MT_SMTC
184 unsigned int wired;
185 unsigned long flags, old_ctx;
186
187 ENTER_CRITICAL(flags);
188 old_ctx = read_c0_entryhi();
189 wired = read_c0_wired() - 1;
190 write_c0_wired(wired);
191 write_c0_index(wired);
192 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
193 write_c0_entrylo0(0);
194 write_c0_entrylo1(0);
195 mtc0_tlbw_hazard();
196 tlb_write_indexed();
197 tlbw_use_hazard();
198 write_c0_entryhi(old_ctx);
199 EXIT_CRITICAL(flags);
200#endif
201 dec_preempt_count();
202 preempt_check_resched();
203}
204
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000205void copy_user_highpage(struct page *to, struct page *from,
206 unsigned long vaddr, struct vm_area_struct *vma)
207{
208 void *vfrom, *vto;
209
Cong Wang9c020482011-11-25 23:14:15 +0800210 vto = kmap_atomic(to);
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000211 if (cpu_has_dc_aliases &&
212 page_mapped(from) && !Page_dcache_dirty(from)) {
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000213 vfrom = kmap_coherent(from, vaddr);
214 copy_page(vto, vfrom);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100215 kunmap_coherent();
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000216 } else {
Cong Wang9c020482011-11-25 23:14:15 +0800217 vfrom = kmap_atomic(from);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000218 copy_page(vto, vfrom);
Cong Wang9c020482011-11-25 23:14:15 +0800219 kunmap_atomic(vfrom);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000220 }
Ralf Baechle39b8d522008-04-28 17:14:26 +0100221 if ((!cpu_has_ic_fills_f_dc) ||
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000222 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
223 flush_data_cache_page((unsigned long)vto);
Cong Wang9c020482011-11-25 23:14:15 +0800224 kunmap_atomic(vto);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000225 /* Make sure this page is cleared on other CPU's too before using it */
226 smp_wmb();
227}
228
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100229void copy_to_user_page(struct vm_area_struct *vma,
230 struct page *page, unsigned long vaddr, void *dst, const void *src,
231 unsigned long len)
232{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000233 if (cpu_has_dc_aliases &&
234 page_mapped(page) && !Page_dcache_dirty(page)) {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100235 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
236 memcpy(vto, src, len);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100237 kunmap_coherent();
Ralf Baechle985c30e2007-10-15 16:30:24 +0100238 } else {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100239 memcpy(dst, src, len);
Ralf Baechle985c30e2007-10-15 16:30:24 +0100240 if (cpu_has_dc_aliases)
241 SetPageDcacheDirty(page);
242 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100243 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
244 flush_cache_page(vma, vaddr, page_to_pfn(page));
245}
246
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100247void copy_from_user_page(struct vm_area_struct *vma,
248 struct page *page, unsigned long vaddr, void *dst, const void *src,
249 unsigned long len)
250{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000251 if (cpu_has_dc_aliases &&
252 page_mapped(page) && !Page_dcache_dirty(page)) {
Ralf Baechle985c30e2007-10-15 16:30:24 +0100253 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100254 memcpy(dst, vfrom, len);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100255 kunmap_coherent();
Ralf Baechle985c30e2007-10-15 16:30:24 +0100256 } else {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100257 memcpy(dst, src, len);
Ralf Baechle985c30e2007-10-15 16:30:24 +0100258 if (cpu_has_dc_aliases)
259 SetPageDcacheDirty(page);
260 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100261}
262
Ralf Baechle84fd0892005-02-07 16:13:07 +0000263void __init fixrange_init(unsigned long start, unsigned long end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 pgd_t *pgd_base)
265{
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100266#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 pgd_t *pgd;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000268 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 pmd_t *pmd;
270 pte_t *pte;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000271 int i, j, k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 unsigned long vaddr;
273
274 vaddr = start;
275 i = __pgd_offset(vaddr);
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000276 j = __pud_offset(vaddr);
277 k = __pmd_offset(vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 pgd = pgd_base + i;
279
Kevin Cernekee464fd832011-01-05 23:31:30 -0800280 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000281 pud = (pud_t *)pgd;
Kevin Cernekee464fd832011-01-05 23:31:30 -0800282 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000283 pmd = (pmd_t *)pud;
Kevin Cernekee464fd832011-01-05 23:31:30 -0800284 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000285 if (pmd_none(*pmd)) {
286 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100287 set_pmd(pmd, __pmd((unsigned long)pte));
Ralf Baechleb72b7092009-03-30 14:49:44 +0200288 BUG_ON(pte != pte_offset_kernel(pmd, 0));
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000289 }
290 vaddr += PMD_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000292 k = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 }
294 j = 0;
295 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100296#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700299#ifndef CONFIG_NEED_MULTIPLE_NODES
Wu Fengguang61ef2482010-01-22 16:16:19 +0800300int page_is_ram(unsigned long pagenr)
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900301{
302 int i;
303
304 for (i = 0; i < boot_mem_map.nr_map; i++) {
305 unsigned long addr, end;
306
David Daney43064c02011-11-22 14:38:03 +0000307 switch (boot_mem_map.map[i].type) {
308 case BOOT_MEM_RAM:
309 case BOOT_MEM_INIT_RAM:
310 break;
311 default:
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900312 /* not usable memory */
313 continue;
David Daney43064c02011-11-22 14:38:03 +0000314 }
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900315
316 addr = PFN_UP(boot_mem_map.map[i].addr);
317 end = PFN_DOWN(boot_mem_map.map[i].addr +
318 boot_mem_map.map[i].size);
319
320 if (pagenr >= addr && pagenr < end)
321 return 1;
322 }
323
324 return 0;
325}
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327void __init paging_init(void)
328{
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000329 unsigned long max_zone_pfns[MAX_NR_ZONES];
David Daneyd3ce0e92011-01-24 14:51:37 -0800330 unsigned long lastpfn __maybe_unused;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 pagetable_init();
333
334#ifdef CONFIG_HIGHMEM
335 kmap_init();
336#endif
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100337 kmap_coherent_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Atsushi Nemoto05502332007-03-21 00:36:02 +0900339#ifdef CONFIG_ZONE_DMA
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000340 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341#endif
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000342#ifdef CONFIG_ZONE_DMA32
343 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
344#endif
345 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
346 lastpfn = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347#ifdef CONFIG_HIGHMEM
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000348 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
349 lastpfn = highend_pfn;
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100350
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000351 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100352 printk(KERN_WARNING "This processor doesn't support highmem."
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000353 " %ldk highmem ignored\n",
354 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
355 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
356 lastpfn = max_low_pfn;
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358#endif
359
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000360 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361}
362
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500363#ifdef CONFIG_64BIT
364static struct kcore_list kcore_kseg0;
365#endif
366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367void __init mem_init(void)
368{
369 unsigned long codesize, reservedpages, datasize, initsize;
370 unsigned long tmp, ram;
371
372#ifdef CONFIG_HIGHMEM
373#ifdef CONFIG_DISCONTIGMEM
374#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
375#endif
Kevin Cernekeeb6da0ff2010-05-30 00:32:51 -0700376 max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377#else
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900378 max_mapnr = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379#endif
380 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
381
382 totalram_pages += free_all_bootmem();
383 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
384
385 reservedpages = ram = 0;
386 for (tmp = 0; tmp < max_low_pfn; tmp++)
David Daney43064c02011-11-22 14:38:03 +0000387 if (page_is_ram(tmp) && pfn_valid(tmp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 ram++;
Chad Reeseb1c231f2006-05-30 17:16:49 -0700389 if (PageReserved(pfn_to_page(tmp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 reservedpages++;
391 }
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900392 num_physpages = ram;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394#ifdef CONFIG_HIGHMEM
395 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
Ralf Baechlea8049c52007-11-04 04:42:03 +0000396 struct page *page = pfn_to_page(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398 if (!page_is_ram(tmp)) {
399 SetPageReserved(page);
400 continue;
401 }
402 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800403 init_page_count(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 __free_page(page);
405 totalhigh_pages++;
406 }
407 totalram_pages += totalhigh_pages;
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900408 num_physpages += totalhigh_pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409#endif
410
411 codesize = (unsigned long) &_etext - (unsigned long) &_text;
412 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
413 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
414
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500415#ifdef CONFIG_64BIT
416 if ((unsigned long) &_text > (unsigned long) CKSEG0)
417 /* The -4 is a hack so that user tools don't have to handle
418 the overflow. */
KAMEZAWA Hiroyukic30bb2a2009-09-22 16:45:43 -0700419 kclist_add(&kcore_kseg0, (void *) CKSEG0,
420 0x80000000 - 4, KCORE_TEXT);
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500421#endif
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
424 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
Geert Uytterhoevencc013a82009-09-21 17:02:36 -0700425 nr_free_pages() << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 ram << (PAGE_SHIFT-10),
427 codesize >> 10,
428 reservedpages << (PAGE_SHIFT-10),
429 datasize >> 10,
430 initsize >> 10,
Andreas Fenkart4b529402010-01-08 14:42:31 -0800431 totalhigh_pages << (PAGE_SHIFT-10));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700433#endif /* !CONFIG_NEED_MULTIPLE_NODES */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900435void free_init_pages(const char *what, unsigned long begin, unsigned long end)
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000436{
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200437 unsigned long pfn;
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000438
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200439 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
440 struct page *page = pfn_to_page(pfn);
441 void *addr = phys_to_virt(PFN_PHYS(pfn));
442
443 ClearPageReserved(page);
444 init_page_count(page);
445 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
446 __free_page(page);
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000447 totalram_pages++;
448 }
449 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
450}
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452#ifdef CONFIG_BLK_DEV_INITRD
453void free_initrd_mem(unsigned long start, unsigned long end)
454{
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200455 free_init_pages("initrd memory",
456 virt_to_phys((void *)start),
457 virt_to_phys((void *)end));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459#endif
460
Atsushi Nemotofb4bb132007-07-22 23:44:20 +0900461void __init_refok free_initmem(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900463 prom_free_prom_memory();
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200464 free_init_pages("unused kernel memory",
465 __pa_symbol(&__init_begin),
466 __pa_symbol(&__init_end));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467}
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900468
David Daney826222842009-10-14 12:16:56 -0700469#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900470unsigned long pgd_current[NR_CPUS];
David Daney826222842009-10-14 12:16:56 -0700471#endif
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900472/*
473 * On 64-bit we've got three-level pagetables with a slightly
474 * different layout ...
475 */
476#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
Ralf Baechle9975e772007-08-13 12:44:41 +0100477
478/*
479 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
480 * are constants. So we use the variants from asm-offset.h until that gcc
481 * will officially be retired.
482 */
483pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
David Daney325f8a02009-12-04 13:52:36 -0800484#ifndef __PAGETABLE_PMD_FOLDED
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900485pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
486#endif
487pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);