blob: faa5c9822eccf48bc433f886a9939d93a1112bf1 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070047/*
48 * We have up to 8 empty zeroed pages so we can map one of the right colour
Ralf Baechle70342282013-01-22 12:59:30 +010049 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 * where we have to avoid VCED / VECI exceptions for good performance at
51 * any price. Since page is never written to after the initialization we
52 * don't have to care about aliases on other CPUs.
53 */
54unsigned long empty_zero_page, zero_page_mask;
Ralf Baechle497d2ad2008-06-06 14:23:06 +010055EXPORT_SYMBOL_GPL(empty_zero_page);
Ard Biesheuvel0b700682014-09-12 22:17:23 +020056EXPORT_SYMBOL(zero_page_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58/*
59 * Not static inline because used by IP27 special magic initialization code
60 */
Jiang Liu316059222013-04-29 15:06:43 -070061void setup_zero_pages(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
Jiang Liu316059222013-04-29 15:06:43 -070063 unsigned int order, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 struct page *page;
65
66 if (cpu_has_vce)
67 order = 3;
68 else
69 order = 0;
70
71 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
72 if (!empty_zero_page)
73 panic("Oh boy, that early out of memory?");
74
Franck Bui-Huu99e3b942006-10-19 13:19:59 +020075 page = virt_to_page((void *)empty_zero_page);
Nick Piggin8dfcc9b2006-03-22 00:08:05 -080076 split_page(page, order);
Jiang Liu316059222013-04-29 15:06:43 -070077 for (i = 0; i < (1 << order); i++, page++)
78 mark_page_reserved(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Jiang Liu316059222013-04-29 15:06:43 -070080 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}
82
Paul Burtone2a9e5a2014-03-03 12:08:40 +000083static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
Ralf Baechlef8829ca2006-10-21 23:17:35 +010084{
85 enum fixed_addresses idx;
86 unsigned long vaddr, flags, entrylo;
87 unsigned long old_ctx;
88 pte_t pte;
89 int tlbidx;
90
Ralf Baechleb8688682007-09-11 18:05:33 +010091 BUG_ON(Page_dcache_dirty(page));
92
Peter Zijlstrabdb43802013-09-10 12:15:23 +020093 pagefault_disable();
Ralf Baechlef8829ca2006-10-21 23:17:35 +010094 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
Kevin Cernekee0f334a32009-09-07 11:11:31 -070095 idx += in_interrupt() ? FIX_N_COLOURS : 0;
Ralf Baechlef8829ca2006-10-21 23:17:35 +010096 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
Paul Burtone2a9e5a2014-03-03 12:08:40 +000097 pte = mk_pte(page, prot);
Ralf Baechle34adb282014-11-22 00:16:48 +010098#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
Steven J. Hillc5b36782015-02-26 18:16:38 -060099 entrylo = pte_to_entrylo(pte.pte_high);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100100#else
David Daney6dd93442010-02-10 15:12:47 -0800101 entrylo = pte_to_entrylo(pte_val(pte));
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100102#endif
103
Ralf Baechleb633648c52014-05-23 16:29:44 +0200104 local_irq_save(flags);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100105 old_ctx = read_c0_entryhi();
106 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
107 write_c0_entrylo0(entrylo);
108 write_c0_entrylo1(entrylo);
Steven J. Hillc5b36782015-02-26 18:16:38 -0600109#ifdef CONFIG_XPA
110 entrylo = (pte.pte_low & _PFNX_MASK);
111 writex_c0_entrylo0(entrylo);
112 writex_c0_entrylo1(entrylo);
113#endif
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100114 tlbidx = read_c0_wired();
115 write_c0_wired(tlbidx + 1);
116 write_c0_index(tlbidx);
117 mtc0_tlbw_hazard();
118 tlb_write_indexed();
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100119 tlbw_use_hazard();
120 write_c0_entryhi(old_ctx);
Ralf Baechleb633648c52014-05-23 16:29:44 +0200121 local_irq_restore(flags);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100122
123 return (void*) vaddr;
124}
125
Paul Burtone2a9e5a2014-03-03 12:08:40 +0000126void *kmap_coherent(struct page *page, unsigned long addr)
127{
128 return __kmap_pgprot(page, addr, PAGE_KERNEL);
129}
130
131void *kmap_noncoherent(struct page *page, unsigned long addr)
132{
133 return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
134}
135
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100136void kunmap_coherent(void)
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100137{
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100138 unsigned int wired;
139 unsigned long flags, old_ctx;
140
Ralf Baechleb633648c52014-05-23 16:29:44 +0200141 local_irq_save(flags);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100142 old_ctx = read_c0_entryhi();
143 wired = read_c0_wired() - 1;
144 write_c0_wired(wired);
145 write_c0_index(wired);
146 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
147 write_c0_entrylo0(0);
148 write_c0_entrylo1(0);
149 mtc0_tlbw_hazard();
150 tlb_write_indexed();
151 tlbw_use_hazard();
152 write_c0_entryhi(old_ctx);
Ralf Baechleb633648c52014-05-23 16:29:44 +0200153 local_irq_restore(flags);
Peter Zijlstrabdb43802013-09-10 12:15:23 +0200154 pagefault_enable();
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100155}
156
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000157void copy_user_highpage(struct page *to, struct page *from,
158 unsigned long vaddr, struct vm_area_struct *vma)
159{
160 void *vfrom, *vto;
161
Cong Wang9c020482011-11-25 23:14:15 +0800162 vto = kmap_atomic(to);
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000163 if (cpu_has_dc_aliases &&
164 page_mapped(from) && !Page_dcache_dirty(from)) {
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000165 vfrom = kmap_coherent(from, vaddr);
166 copy_page(vto, vfrom);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100167 kunmap_coherent();
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000168 } else {
Cong Wang9c020482011-11-25 23:14:15 +0800169 vfrom = kmap_atomic(from);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000170 copy_page(vto, vfrom);
Cong Wang9c020482011-11-25 23:14:15 +0800171 kunmap_atomic(vfrom);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000172 }
Ralf Baechle39b8d522008-04-28 17:14:26 +0100173 if ((!cpu_has_ic_fills_f_dc) ||
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000174 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
175 flush_data_cache_page((unsigned long)vto);
Cong Wang9c020482011-11-25 23:14:15 +0800176 kunmap_atomic(vto);
Atsushi Nemotobcd02282006-12-12 17:14:56 +0000177 /* Make sure this page is cleared on other CPU's too before using it */
178 smp_wmb();
179}
180
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100181void copy_to_user_page(struct vm_area_struct *vma,
182 struct page *page, unsigned long vaddr, void *dst, const void *src,
183 unsigned long len)
184{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000185 if (cpu_has_dc_aliases &&
186 page_mapped(page) && !Page_dcache_dirty(page)) {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100187 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
188 memcpy(vto, src, len);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100189 kunmap_coherent();
Ralf Baechle985c30e2007-10-15 16:30:24 +0100190 } else {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100191 memcpy(dst, src, len);
Ralf Baechle985c30e2007-10-15 16:30:24 +0100192 if (cpu_has_dc_aliases)
193 SetPageDcacheDirty(page);
194 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100195 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
196 flush_cache_page(vma, vaddr, page_to_pfn(page));
197}
198
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100199void copy_from_user_page(struct vm_area_struct *vma,
200 struct page *page, unsigned long vaddr, void *dst, const void *src,
201 unsigned long len)
202{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000203 if (cpu_has_dc_aliases &&
204 page_mapped(page) && !Page_dcache_dirty(page)) {
Ralf Baechle985c30e2007-10-15 16:30:24 +0100205 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100206 memcpy(dst, vfrom, len);
Ralf Baechleeacb9d62007-04-26 15:46:25 +0100207 kunmap_coherent();
Ralf Baechle985c30e2007-10-15 16:30:24 +0100208 } else {
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100209 memcpy(dst, src, len);
Ralf Baechle985c30e2007-10-15 16:30:24 +0100210 if (cpu_has_dc_aliases)
211 SetPageDcacheDirty(page);
212 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100213}
Geert Uytterhoevenbf9621a2013-09-05 11:22:45 +0200214EXPORT_SYMBOL_GPL(copy_from_user_page);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100215
Ralf Baechle84fd0892005-02-07 16:13:07 +0000216void __init fixrange_init(unsigned long start, unsigned long end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 pgd_t *pgd_base)
218{
Ralf Baechleb633648c52014-05-23 16:29:44 +0200219#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 pgd_t *pgd;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000221 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 pmd_t *pmd;
223 pte_t *pte;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000224 int i, j, k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 unsigned long vaddr;
226
227 vaddr = start;
228 i = __pgd_offset(vaddr);
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000229 j = __pud_offset(vaddr);
230 k = __pmd_offset(vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 pgd = pgd_base + i;
232
Kevin Cernekee464fd832011-01-05 23:31:30 -0800233 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000234 pud = (pud_t *)pgd;
Kevin Cernekee464fd832011-01-05 23:31:30 -0800235 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000236 pmd = (pmd_t *)pud;
Kevin Cernekee464fd832011-01-05 23:31:30 -0800237 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000238 if (pmd_none(*pmd)) {
239 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100240 set_pmd(pmd, __pmd((unsigned long)pte));
Ralf Baechleb72b7092009-03-30 14:49:44 +0200241 BUG_ON(pte != pte_offset_kernel(pmd, 0));
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000242 }
243 vaddr += PMD_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 }
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000245 k = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 }
247 j = 0;
248 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100249#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700252#ifndef CONFIG_NEED_MULTIPLE_NODES
Wu Fengguang61ef2482010-01-22 16:16:19 +0800253int page_is_ram(unsigned long pagenr)
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900254{
255 int i;
256
257 for (i = 0; i < boot_mem_map.nr_map; i++) {
258 unsigned long addr, end;
259
David Daney43064c02011-11-22 14:38:03 +0000260 switch (boot_mem_map.map[i].type) {
261 case BOOT_MEM_RAM:
262 case BOOT_MEM_INIT_RAM:
263 break;
264 default:
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900265 /* not usable memory */
266 continue;
David Daney43064c02011-11-22 14:38:03 +0000267 }
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900268
269 addr = PFN_UP(boot_mem_map.map[i].addr);
270 end = PFN_DOWN(boot_mem_map.map[i].addr +
271 boot_mem_map.map[i].size);
272
273 if (pagenr >= addr && pagenr < end)
274 return 1;
275 }
276
277 return 0;
278}
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280void __init paging_init(void)
281{
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000282 unsigned long max_zone_pfns[MAX_NR_ZONES];
David Daneyd3ce0e92011-01-24 14:51:37 -0800283 unsigned long lastpfn __maybe_unused;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 pagetable_init();
286
287#ifdef CONFIG_HIGHMEM
288 kmap_init();
289#endif
Atsushi Nemoto05502332007-03-21 00:36:02 +0900290#ifdef CONFIG_ZONE_DMA
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000291 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292#endif
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000293#ifdef CONFIG_ZONE_DMA32
294 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
295#endif
296 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
297 lastpfn = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298#ifdef CONFIG_HIGHMEM
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000299 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
300 lastpfn = highend_pfn;
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100301
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000302 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100303 printk(KERN_WARNING "This processor doesn't support highmem."
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000304 " %ldk highmem ignored\n",
305 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
306 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
307 lastpfn = max_low_pfn;
Franck Bui-Huucbb8fc02006-12-06 16:48:28 +0100308 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309#endif
310
Ralf Baechlecce335ae2007-11-03 02:05:43 +0000311 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
313
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500314#ifdef CONFIG_64BIT
315static struct kcore_list kcore_kseg0;
316#endif
317
Jiang Liu11321372013-07-03 15:04:04 -0700318static inline void mem_init_free_highmem(void)
319{
320#ifdef CONFIG_HIGHMEM
321 unsigned long tmp;
322
323 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
324 struct page *page = pfn_to_page(tmp);
325
326 if (!page_is_ram(tmp))
327 SetPageReserved(page);
328 else
329 free_highmem_page(page);
330 }
331#endif
332}
333
Paul Burtonab9988a2014-07-14 10:32:15 +0100334unsigned __weak platform_maar_init(unsigned num_maars)
335{
336 return 0;
337}
338
339static void maar_init(void)
340{
341 unsigned num_maars, used, i;
342
343 if (!cpu_has_maar)
344 return;
345
346 /* Detect the number of MAARs */
347 write_c0_maari(~0);
348 back_to_back_c0_hazard();
349 num_maars = read_c0_maari() + 1;
350
351 /* MAARs should be in pairs */
352 WARN_ON(num_maars % 2);
353
354 /* Configure the required MAARs */
355 used = platform_maar_init(num_maars / 2);
356
357 /* Disable any further MAARs */
358 for (i = (used * 2); i < num_maars; i++) {
359 write_c0_maari(i);
360 back_to_back_c0_hazard();
361 write_c0_maar(0);
362 back_to_back_c0_hazard();
363 }
364}
365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366void __init mem_init(void)
367{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368#ifdef CONFIG_HIGHMEM
369#ifdef CONFIG_DISCONTIGMEM
370#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
371#endif
Kevin Cernekeeb6da0ff2010-05-30 00:32:51 -0700372 max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373#else
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900374 max_mapnr = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375#endif
376 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
377
Paul Burtonab9988a2014-07-14 10:32:15 +0100378 maar_init();
Jiang Liu0c988532013-07-03 15:03:24 -0700379 free_all_bootmem();
Jiang Liu316059222013-04-29 15:06:43 -0700380 setup_zero_pages(); /* Setup zeroed pages. */
Jiang Liu11321372013-07-03 15:04:04 -0700381 mem_init_free_highmem();
382 mem_init_print_info(NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500384#ifdef CONFIG_64BIT
385 if ((unsigned long) &_text > (unsigned long) CKSEG0)
386 /* The -4 is a hack so that user tools don't have to handle
387 the overflow. */
KAMEZAWA Hiroyukic30bb2a2009-09-22 16:45:43 -0700388 kclist_add(&kcore_kseg0, (void *) CKSEG0,
389 0x80000000 - 4, KCORE_TEXT);
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500390#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700392#endif /* !CONFIG_NEED_MULTIPLE_NODES */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900394void free_init_pages(const char *what, unsigned long begin, unsigned long end)
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000395{
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200396 unsigned long pfn;
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000397
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200398 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
399 struct page *page = pfn_to_page(pfn);
400 void *addr = phys_to_virt(PFN_PHYS(pfn));
401
Franck Bui-Huuacd86b82006-10-19 13:20:05 +0200402 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
Jiang Liu316059222013-04-29 15:06:43 -0700403 free_reserved_page(page);
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000404 }
405 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
406}
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408#ifdef CONFIG_BLK_DEV_INITRD
409void free_initrd_mem(unsigned long start, unsigned long end)
410{
Jiang Liu11199692013-07-03 15:02:48 -0700411 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
412 "initrd");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414#endif
415
Markos Chandras0893d3f2014-01-15 14:06:03 +0000416void (*free_init_pages_eva)(void *begin, void *end) = NULL;
417
Atsushi Nemotofb4bb132007-07-22 23:44:20 +0900418void __init_refok free_initmem(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900420 prom_free_prom_memory();
Markos Chandras0893d3f2014-01-15 14:06:03 +0000421 /*
422 * Let the platform define a specific function to free the
423 * init section since EVA may have used any possible mapping
424 * between virtual and physical addresses.
425 */
426 if (free_init_pages_eva)
427 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
428 else
429 free_initmem_default(POISON_FREE_INITMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900431
David Daney826222842009-10-14 12:16:56 -0700432#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900433unsigned long pgd_current[NR_CPUS];
David Daney826222842009-10-14 12:16:56 -0700434#endif
Ralf Baechle9975e772007-08-13 12:44:41 +0100435
436/*
437 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
438 * are constants. So we use the variants from asm-offset.h until that gcc
439 * will officially be retired.
David Daney485172b2012-08-14 11:08:01 -0700440 *
441 * Align swapper_pg_dir in to 64K, allows its address to be loaded
442 * with a single LUI instruction in the TLB handlers. If we used
443 * __aligned(64K), its size would get rounded up to the alignment
444 * size, and waste space. So we place it in its own section and align
445 * it in the linker script.
Ralf Baechle9975e772007-08-13 12:44:41 +0100446 */
David Daney485172b2012-08-14 11:08:01 -0700447pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
David Daney325f8a02009-12-04 13:52:36 -0800448#ifndef __PAGETABLE_PMD_FOLDED
David Daney485172b2012-08-14 11:08:01 -0700449pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
Atsushi Nemoto69a6c312007-01-24 01:21:05 +0900450#endif
David Daney485172b2012-08-14 11:08:01 -0700451pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;