blob: 80ff52e27b7fb21bdff5f92aabcbd45a3d132fbf [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>
David Howells2f96b8c2013-04-12 00:10:25 +010032#include <linux/kcore.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Ralf Baechle9975e772007-08-13 12:44:41 +010034#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <asm/bootinfo.h>
36#include <asm/cachectl.h>
37#include <asm/cpu.h>
38#include <asm/dma.h>
Ralf Baechlef8829ca2006-10-21 23:17:35 +010039#include <asm/kmap_types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <asm/mmu_context.h>
41#include <asm/sections.h>
42#include <asm/pgtable.h>
43#include <asm/pgalloc.h>
44#include <asm/tlb.h>
Ralf Baechlef8829ca2006-10-21 23:17:35 +010045#include <asm/fixmap.h>
46
47/* Atomicity and interruptability */
48#ifdef CONFIG_MIPS_MT_SMTC
49
50#include <asm/mipsmtregs.h>
51
52#define ENTER_CRITICAL(flags) \
53 { \
54 unsigned int mvpflags; \
55 local_irq_save(flags);\
56 mvpflags = dvpe()
57#define EXIT_CRITICAL(flags) \
58 evpe(mvpflags); \
59 local_irq_restore(flags); \
60 }
61#else
62
63#define ENTER_CRITICAL(flags) local_irq_save(flags)
64#define EXIT_CRITICAL(flags) local_irq_restore(flags)
65
66#endif /* CONFIG_MIPS_MT_SMTC */
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Linus Torvalds1da177e2005-04-16 15:20:36 -070068/*
69 * We have up to 8 empty zeroed pages so we can map one of the right colour
Ralf Baechle70342282013-01-22 12:59:30 +010070 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 * where we have to avoid VCED / VECI exceptions for good performance at
72 * any price. Since page is never written to after the initialization we
73 * don't have to care about aliases on other CPUs.
74 */
75unsigned long empty_zero_page, zero_page_mask;
Ralf Baechle497d2ad2008-06-06 14:23:06 +010076EXPORT_SYMBOL_GPL(empty_zero_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78/*
79 * Not static inline because used by IP27 special magic initialization code
80 */
Jiang Liu316059222013-04-29 15:06:43 -070081void setup_zero_pages(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
Jiang Liu316059222013-04-29 15:06:43 -070083 unsigned int order, i;
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);
Jiang Liu316059222013-04-29 15:06:43 -070097 for (i = 0; i < (1 << order); i++, page++)
98 mark_page_reserved(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Jiang Liu316059222013-04-29 15:06:43 -0700100 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100103#ifdef CONFIG_MIPS_MT_SMTC
104static pte_t *kmap_coherent_pte;
105static void __init kmap_coherent_init(void)
106{
107 unsigned long vaddr;
108
109 /* cache the first coherent kmap pte */
110 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
111 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
112}
113#else
114static inline void kmap_coherent_init(void) {}
115#endif
116
Paul Burtone2a9e5a2014-03-03 12:08:40 +0000117static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100118{
119 enum fixed_addresses idx;
120 unsigned long vaddr, flags, entrylo;
121 unsigned long old_ctx;
122 pte_t pte;
123 int tlbidx;
124
Ralf Baechleb8688682007-09-11 18:05:33 +0100125 BUG_ON(Page_dcache_dirty(page));
126
Peter Zijlstrabdb43802013-09-10 12:15:23 +0200127 pagefault_disable();
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100128 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
129#ifdef CONFIG_MIPS_MT_SMTC
Kevin Cernekee0f334a32009-09-07 11:11:31 -0700130 idx += FIX_N_COLOURS * smp_processor_id() +
131 (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
132#else
133 idx += in_interrupt() ? FIX_N_COLOURS : 0;
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100134#endif
135 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
Paul Burtone2a9e5a2014-03-03 12:08:40 +0000136 pte = mk_pte(page, prot);
Chris Dearman962f4802007-09-19 00:46:32 +0100137#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100138 entrylo = pte.pte_high;
139#else
David Daney6dd93442010-02-10 15:12:47 -0800140 entrylo = pte_to_entrylo(pte_val(pte));
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100141#endif
142
143 ENTER_CRITICAL(flags);
144 old_ctx = read_c0_entryhi();
145 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
146 write_c0_entrylo0(entrylo);
147 write_c0_entrylo1(entrylo);
148#ifdef CONFIG_MIPS_MT_SMTC
149 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
150 /* preload TLB instead of local_flush_tlb_one() */
151 mtc0_tlbw_hazard();
152 tlb_probe();
153 tlb_probe_hazard();
154 tlbidx = read_c0_index();
155 mtc0_tlbw_hazard();
156 if (tlbidx < 0)
157 tlb_write_random();
158 else
159 tlb_write_indexed();
160#else
161 tlbidx = read_c0_wired();
162 write_c0_wired(tlbidx + 1);
163 write_c0_index(tlbidx);
164 mtc0_tlbw_hazard();
165 tlb_write_indexed();
166#endif
167 tlbw_use_hazard();
168 write_c0_entryhi(old_ctx);
169 EXIT_CRITICAL(flags);
170
171 return (void*) vaddr;
172}
173
Paul Burtone2a9e5a2014-03-03 12:08:40 +0000174void *kmap_coherent(struct page *page, unsigned long addr)
175{
176 return __kmap_pgprot(page, addr, PAGE_KERNEL);
177}
178
179void *kmap_noncoherent(struct page *page, unsigned long addr)
180{
181 return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
182}
183
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100184void kunmap_coherent(void)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100185{
186#ifndef CONFIG_MIPS_MT_SMTC
187 unsigned int wired;
188 unsigned long flags, old_ctx;
189
190 ENTER_CRITICAL(flags);
191 old_ctx = read_c0_entryhi();
192 wired = read_c0_wired() - 1;
193 write_c0_wired(wired);
194 write_c0_index(wired);
195 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
196 write_c0_entrylo0(0);
197 write_c0_entrylo1(0);
198 mtc0_tlbw_hazard();
199 tlb_write_indexed();
200 tlbw_use_hazard();
201 write_c0_entryhi(old_ctx);
202 EXIT_CRITICAL(flags);
203#endif
Peter Zijlstrabdb43802013-09-10 12:15:23 +0200204 pagefault_enable();
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100205}
206
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000207void copy_user_highpage(struct page *to, struct page *from,
208 unsigned long vaddr, struct vm_area_struct *vma)
209{
210 void *vfrom, *vto;
211
Cong Wang9c020482011-11-25 23:14:15 +0800212 vto = kmap_atomic(to);
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000213 if (cpu_has_dc_aliases &&
214 page_mapped(from) && !Page_dcache_dirty(from)) {
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000215 vfrom = kmap_coherent(from, vaddr);
216 copy_page(vto, vfrom);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100217 kunmap_coherent();
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000218 } else {
Cong Wang9c020482011-11-25 23:14:15 +0800219 vfrom = kmap_atomic(from);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000220 copy_page(vto, vfrom);
Cong Wang9c020482011-11-25 23:14:15 +0800221 kunmap_atomic(vfrom);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000222 }
Ralf Baechle39b8d522008-04-28 17:14:26 +0100223 if ((!cpu_has_ic_fills_f_dc) ||
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000224 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
225 flush_data_cache_page((unsigned long)vto);
Cong Wang9c020482011-11-25 23:14:15 +0800226 kunmap_atomic(vto);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000227 /* Make sure this page is cleared on other CPU's too before using it */
228 smp_wmb();
229}
230
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100231void copy_to_user_page(struct vm_area_struct *vma,
232 struct page *page, unsigned long vaddr, void *dst, const void *src,
233 unsigned long len)
234{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000235 if (cpu_has_dc_aliases &&
236 page_mapped(page) && !Page_dcache_dirty(page)) {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100237 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
238 memcpy(vto, src, len);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100239 kunmap_coherent();
Ralf Baechle985c30e2007-10-15 16:30:24 +0100240 } else {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100241 memcpy(dst, src, len);
Ralf Baechle985c30e2007-10-15 16:30:24 +0100242 if (cpu_has_dc_aliases)
243 SetPageDcacheDirty(page);
244 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100245 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
246 flush_cache_page(vma, vaddr, page_to_pfn(page));
247}
248
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100249void copy_from_user_page(struct vm_area_struct *vma,
250 struct page *page, unsigned long vaddr, void *dst, const void *src,
251 unsigned long len)
252{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000253 if (cpu_has_dc_aliases &&
254 page_mapped(page) && !Page_dcache_dirty(page)) {
Ralf Baechle985c30e2007-10-15 16:30:24 +0100255 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100256 memcpy(dst, vfrom, len);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100257 kunmap_coherent();
Ralf Baechle985c30e2007-10-15 16:30:24 +0100258 } else {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100259 memcpy(dst, src, len);
Ralf Baechle985c30e2007-10-15 16:30:24 +0100260 if (cpu_has_dc_aliases)
261 SetPageDcacheDirty(page);
262 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100263}
Geert Uytterhoevenbf9621a2013-09-05 11:22:45 +0200264EXPORT_SYMBOL_GPL(copy_from_user_page);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100265
Ralf Baechle84fd0892005-02-07 16:13:07 +0000266void __init fixrange_init(unsigned long start, unsigned long end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 pgd_t *pgd_base)
268{
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100269#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 pgd_t *pgd;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000271 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 pmd_t *pmd;
273 pte_t *pte;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000274 int i, j, k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 unsigned long vaddr;
276
277 vaddr = start;
278 i = __pgd_offset(vaddr);
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000279 j = __pud_offset(vaddr);
280 k = __pmd_offset(vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 pgd = pgd_base + i;
282
Kevin Cernekee464fd832011-01-05 23:31:30 -0800283 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000284 pud = (pud_t *)pgd;
Kevin Cernekee464fd832011-01-05 23:31:30 -0800285 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000286 pmd = (pmd_t *)pud;
Kevin Cernekee464fd832011-01-05 23:31:30 -0800287 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000288 if (pmd_none(*pmd)) {
289 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100290 set_pmd(pmd, __pmd((unsigned long)pte));
Ralf Baechleb72b7092009-03-30 14:49:44 +0200291 BUG_ON(pte != pte_offset_kernel(pmd, 0));
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000292 }
293 vaddr += PMD_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 }
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000295 k = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 }
297 j = 0;
298 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100299#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700302#ifndef CONFIG_NEED_MULTIPLE_NODES
Wu Fengguang61ef2482010-01-22 16:16:19 +0800303int page_is_ram(unsigned long pagenr)
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900304{
305 int i;
306
307 for (i = 0; i < boot_mem_map.nr_map; i++) {
308 unsigned long addr, end;
309
David Daney43064c02011-11-22 14:38:03 +0000310 switch (boot_mem_map.map[i].type) {
311 case BOOT_MEM_RAM:
312 case BOOT_MEM_INIT_RAM:
313 break;
314 default:
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900315 /* not usable memory */
316 continue;
David Daney43064c02011-11-22 14:38:03 +0000317 }
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900318
319 addr = PFN_UP(boot_mem_map.map[i].addr);
320 end = PFN_DOWN(boot_mem_map.map[i].addr +
321 boot_mem_map.map[i].size);
322
323 if (pagenr >= addr && pagenr < end)
324 return 1;
325 }
326
327 return 0;
328}
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330void __init paging_init(void)
331{
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000332 unsigned long max_zone_pfns[MAX_NR_ZONES];
David Daneyd3ce0e92011-01-24 14:51:37 -0800333 unsigned long lastpfn __maybe_unused;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 pagetable_init();
336
337#ifdef CONFIG_HIGHMEM
338 kmap_init();
339#endif
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100340 kmap_coherent_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Atsushi Nemoto05502332007-03-21 00:36:02 +0900342#ifdef CONFIG_ZONE_DMA
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000343 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344#endif
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000345#ifdef CONFIG_ZONE_DMA32
346 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
347#endif
348 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
349 lastpfn = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350#ifdef CONFIG_HIGHMEM
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000351 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
352 lastpfn = highend_pfn;
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100353
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000354 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100355 printk(KERN_WARNING "This processor doesn't support highmem."
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000356 " %ldk highmem ignored\n",
357 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
358 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
359 lastpfn = max_low_pfn;
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100360 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361#endif
362
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000363 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364}
365
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500366#ifdef CONFIG_64BIT
367static struct kcore_list kcore_kseg0;
368#endif
369
Jiang Liu11321372013-07-03 15:04:04 -0700370static inline void mem_init_free_highmem(void)
371{
372#ifdef CONFIG_HIGHMEM
373 unsigned long tmp;
374
375 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
376 struct page *page = pfn_to_page(tmp);
377
378 if (!page_is_ram(tmp))
379 SetPageReserved(page);
380 else
381 free_highmem_page(page);
382 }
383#endif
384}
385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386void __init mem_init(void)
387{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388#ifdef CONFIG_HIGHMEM
389#ifdef CONFIG_DISCONTIGMEM
390#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
391#endif
Kevin Cernekeeb6da0ff2010-05-30 00:32:51 -0700392 max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393#else
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900394 max_mapnr = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395#endif
396 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
397
Jiang Liu0c988532013-07-03 15:03:24 -0700398 free_all_bootmem();
Jiang Liu316059222013-04-29 15:06:43 -0700399 setup_zero_pages(); /* Setup zeroed pages. */
Jiang Liu11321372013-07-03 15:04:04 -0700400 mem_init_free_highmem();
401 mem_init_print_info(NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500403#ifdef CONFIG_64BIT
404 if ((unsigned long) &_text > (unsigned long) CKSEG0)
405 /* The -4 is a hack so that user tools don't have to handle
406 the overflow. */
KAMEZAWA Hiroyukic30bb2a2009-09-22 16:45:43 -0700407 kclist_add(&kcore_kseg0, (void *) CKSEG0,
408 0x80000000 - 4, KCORE_TEXT);
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500409#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700411#endif /* !CONFIG_NEED_MULTIPLE_NODES */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900413void free_init_pages(const char *what, unsigned long begin, unsigned long end)
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000414{
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200415 unsigned long pfn;
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000416
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200417 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
418 struct page *page = pfn_to_page(pfn);
419 void *addr = phys_to_virt(PFN_PHYS(pfn));
420
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200421 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
Jiang Liu316059222013-04-29 15:06:43 -0700422 free_reserved_page(page);
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000423 }
424 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
425}
426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427#ifdef CONFIG_BLK_DEV_INITRD
428void free_initrd_mem(unsigned long start, unsigned long end)
429{
Jiang Liu11199692013-07-03 15:02:48 -0700430 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
431 "initrd");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433#endif
434
Markos Chandras0893d3f2014-01-15 14:06:03 +0000435void (*free_init_pages_eva)(void *begin, void *end) = NULL;
436
Atsushi Nemotofb4bb132007-07-22 23:44:20 +0900437void __init_refok free_initmem(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438{
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900439 prom_free_prom_memory();
Markos Chandras0893d3f2014-01-15 14:06:03 +0000440 /*
441 * Let the platform define a specific function to free the
442 * init section since EVA may have used any possible mapping
443 * between virtual and physical addresses.
444 */
445 if (free_init_pages_eva)
446 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
447 else
448 free_initmem_default(POISON_FREE_INITMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449}
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900450
David Daney826222842009-10-14 12:16:56 -0700451#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900452unsigned long pgd_current[NR_CPUS];
David Daney826222842009-10-14 12:16:56 -0700453#endif
Ralf Baechle9975e772007-08-13 12:44:41 +0100454
455/*
456 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
457 * are constants. So we use the variants from asm-offset.h until that gcc
458 * will officially be retired.
David Daney485172b2012-08-14 11:08:01 -0700459 *
460 * Align swapper_pg_dir in to 64K, allows its address to be loaded
461 * with a single LUI instruction in the TLB handlers. If we used
462 * __aligned(64K), its size would get rounded up to the alignment
463 * size, and waste space. So we place it in its own section and align
464 * it in the linker script.
Ralf Baechle9975e772007-08-13 12:44:41 +0100465 */
David Daney485172b2012-08-14 11:08:01 -0700466pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
David Daney325f8a02009-12-04 13:52:36 -0800467#ifndef __PAGETABLE_PMD_FOLDED
David Daney485172b2012-08-14 11:08:01 -0700468pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900469#endif
David Daney485172b2012-08-14 11:08:01 -0700470pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;