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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
3 * Copyright (C) 1995 Linus Torvalds
4 *
5 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
6 */
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/module.h>
9#include <linux/signal.h>
10#include <linux/sched.h>
11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/string.h>
14#include <linux/types.h>
15#include <linux/ptrace.h>
16#include <linux/mman.h>
17#include <linux/mm.h>
18#include <linux/hugetlb.h>
19#include <linux/swap.h>
20#include <linux/smp.h>
21#include <linux/init.h>
22#include <linux/highmem.h>
23#include <linux/pagemap.h>
Jeremy Fitzhardingecfb80c92008-12-16 12:17:36 -080024#include <linux/pci.h>
Jan Beulich6fb14752007-05-02 19:27:10 +020025#include <linux/pfn.h>
Randy Dunlapc9cf5522006-06-27 02:53:52 -070026#include <linux/poison.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/bootmem.h>
Yinghai Lua9ce6bc2010-08-25 13:39:17 -070028#include <linux/memblock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/proc_fs.h>
Dave Hansen05039b92005-10-29 18:16:57 -070030#include <linux/memory_hotplug.h>
Adrian Bunk27d99f72005-11-13 16:06:51 -080031#include <linux/initrd.h>
Shaohua Li55b23552006-06-23 02:04:49 -070032#include <linux/cpumask.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
H. Peter Anvinf832ff12008-02-04 16:47:58 +010035#include <asm/asm.h>
Ingo Molnar46eaa672008-10-12 15:06:29 +020036#include <asm/bios_ebda.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <asm/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/uaccess.h>
39#include <asm/pgtable.h>
40#include <asm/dma.h>
41#include <asm/fixmap.h>
42#include <asm/e820.h>
43#include <asm/apic.h>
Ingo Molnar8550eb92008-01-30 13:34:10 +010044#include <asm/bugs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <asm/tlb.h>
46#include <asm/tlbflush.h>
Andres Salomonc10d1e22010-11-17 06:09:52 +000047#include <asm/olpc_ofw.h>
Jeremy Fitzhardingea5a19c62008-01-30 13:33:39 +010048#include <asm/pgalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <asm/sections.h>
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +020050#include <asm/paravirt.h>
Ian Campbell551889a2008-02-09 23:24:09 +010051#include <asm/setup.h>
Harvey Harrison7bfeab92008-02-12 12:12:01 -080052#include <asm/cacheflush.h>
Pekka Enberg2b723942009-04-28 16:00:49 +030053#include <asm/page_types.h>
Pekka Enberg4fcb2082009-03-05 14:55:08 +020054#include <asm/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Linus Torvalds1da177e2005-04-16 15:20:36 -070056unsigned long highstart_pfn, highend_pfn;
57
Ingo Molnar8550eb92008-01-30 13:34:10 +010058static noinline int do_test_wp_bit(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Jeremy Fitzhardingedc16ecf2009-03-04 16:10:44 -080060bool __read_mostly __vmalloc_start_set = false;
Yinghai Lu4e296842008-06-24 12:18:14 -070061
Jan Beulichd6be89a2008-12-16 11:42:45 +000062static __init void *alloc_low_page(void)
Yinghai Lu4e296842008-06-24 12:18:14 -070063{
Yinghai Lud1b19422011-02-24 14:46:24 +010064 unsigned long pfn = pgt_buf_end++;
Yinghai Lu4e296842008-06-24 12:18:14 -070065 void *adr;
66
Yinghai Lud1b19422011-02-24 14:46:24 +010067 if (pfn >= pgt_buf_top)
Yinghai Lu4e296842008-06-24 12:18:14 -070068 panic("alloc_low_page: ran out of memory");
69
70 adr = __va(pfn * PAGE_SIZE);
Jan Beulich234bb542010-09-02 13:46:34 +010071 clear_page(adr);
Yinghai Lu4e296842008-06-24 12:18:14 -070072 return adr;
73}
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075/*
76 * Creates a middle page table and puts a pointer to it in the
77 * given global directory entry. This only returns the gd entry
78 * in non-PAE compilation mode, since the middle layer is folded.
79 */
80static pmd_t * __init one_md_table_init(pgd_t *pgd)
81{
82 pud_t *pud;
83 pmd_t *pmd_table;
Ingo Molnar8550eb92008-01-30 13:34:10 +010084
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#ifdef CONFIG_X86_PAE
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +020086 if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
Pekka Enbergc4645732009-03-05 14:54:58 +020087 if (after_bootmem)
Jan Beulich3c1596e2009-09-21 17:03:06 -070088 pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE);
Yinghai Lu4e296842008-06-24 12:18:14 -070089 else
Jan Beulichd6be89a2008-12-16 11:42:45 +000090 pmd_table = (pmd_t *)alloc_low_page();
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -070091 paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +020092 set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
93 pud = pud_offset(pgd, 0);
Ingo Molnar8550eb92008-01-30 13:34:10 +010094 BUG_ON(pmd_table != pmd_offset(pud, 0));
Zhaoleia376f302008-10-31 17:43:04 +080095
96 return pmd_table;
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +020097 }
98#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 pud = pud_offset(pgd, 0);
100 pmd_table = pmd_offset(pud, 0);
Ingo Molnar8550eb92008-01-30 13:34:10 +0100101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 return pmd_table;
103}
104
105/*
106 * Create a page table and place a pointer to it in a middle page
Ingo Molnar8550eb92008-01-30 13:34:10 +0100107 * directory entry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 */
109static pte_t * __init one_page_table_init(pmd_t *pmd)
110{
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200111 if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
Ingo Molnar509a80c2007-10-17 18:04:34 +0200112 pte_t *page_table = NULL;
113
Pekka Enbergc4645732009-03-05 14:54:58 +0200114 if (after_bootmem) {
Vegard Nossumf8561292008-04-04 00:53:23 +0200115#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK)
Yinghai Lu4e296842008-06-24 12:18:14 -0700116 page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
Ingo Molnar509a80c2007-10-17 18:04:34 +0200117#endif
Yinghai Lu4e296842008-06-24 12:18:14 -0700118 if (!page_table)
119 page_table =
Jan Beulich3c1596e2009-09-21 17:03:06 -0700120 (pte_t *)alloc_bootmem_pages(PAGE_SIZE);
Jan Beulichd6be89a2008-12-16 11:42:45 +0000121 } else
122 page_table = (pte_t *)alloc_low_page();
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200123
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700124 paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200126 BUG_ON(page_table != pte_offset_kernel(pmd, 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
Ingo Molnar509a80c2007-10-17 18:04:34 +0200128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return pte_offset_kernel(pmd, 0);
130}
131
Tejun Heo458a3e62009-02-24 11:57:21 +0900132pmd_t * __init populate_extra_pmd(unsigned long vaddr)
Tejun Heo11124412009-02-20 16:29:09 +0900133{
134 int pgd_idx = pgd_index(vaddr);
135 int pmd_idx = pmd_index(vaddr);
Tejun Heo458a3e62009-02-24 11:57:21 +0900136
137 return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx;
138}
139
140pte_t * __init populate_extra_pte(unsigned long vaddr)
141{
142 int pte_idx = pte_index(vaddr);
Tejun Heo11124412009-02-20 16:29:09 +0900143 pmd_t *pmd;
144
Tejun Heo458a3e62009-02-24 11:57:21 +0900145 pmd = populate_extra_pmd(vaddr);
146 return one_page_table_init(pmd) + pte_idx;
Tejun Heo11124412009-02-20 16:29:09 +0900147}
148
Jan Beulicha3c60182009-01-16 11:59:33 +0000149static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
150 unsigned long vaddr, pte_t *lastpte)
151{
152#ifdef CONFIG_HIGHMEM
153 /*
154 * Something (early fixmap) may already have put a pte
155 * page here, which causes the page table allocation
156 * to become nonlinear. Attempt to fix it, and if it
157 * is still nonlinear then we have to bug.
158 */
159 int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
160 int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
161
162 if (pmd_idx_kmap_begin != pmd_idx_kmap_end
163 && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin
164 && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end
Yinghai Lud1b19422011-02-24 14:46:24 +0100165 && ((__pa(pte) >> PAGE_SHIFT) < pgt_buf_start
166 || (__pa(pte) >> PAGE_SHIFT) >= pgt_buf_end)) {
Jan Beulicha3c60182009-01-16 11:59:33 +0000167 pte_t *newpte;
168 int i;
169
Pekka Enbergc4645732009-03-05 14:54:58 +0200170 BUG_ON(after_bootmem);
Jan Beulicha3c60182009-01-16 11:59:33 +0000171 newpte = alloc_low_page();
172 for (i = 0; i < PTRS_PER_PTE; i++)
173 set_pte(newpte + i, pte[i]);
174
175 paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT);
176 set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE));
177 BUG_ON(newpte != pte_offset_kernel(pmd, 0));
178 __flush_tlb_all();
179
180 paravirt_release_pte(__pa(pte) >> PAGE_SHIFT);
181 pte = newpte;
182 }
183 BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1)
184 && vaddr > fix_to_virt(FIX_KMAP_END)
185 && lastpte && lastpte + PTRS_PER_PTE != pte);
186#endif
187 return pte;
188}
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190/*
Ingo Molnar8550eb92008-01-30 13:34:10 +0100191 * This function initializes a certain range of kernel virtual memory
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 * with new bootmem page tables, everywhere page tables are missing in
193 * the given range.
Ingo Molnar8550eb92008-01-30 13:34:10 +0100194 *
195 * NOTE: The pagetables are allocated contiguous on the physical space
196 * so we can cache the place of the first one and move around without
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 * checking the pgd every time.
198 */
Ingo Molnar8550eb92008-01-30 13:34:10 +0100199static void __init
200page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 int pgd_idx, pmd_idx;
203 unsigned long vaddr;
Ingo Molnar8550eb92008-01-30 13:34:10 +0100204 pgd_t *pgd;
205 pmd_t *pmd;
Jan Beulicha3c60182009-01-16 11:59:33 +0000206 pte_t *pte = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 vaddr = start;
209 pgd_idx = pgd_index(vaddr);
210 pmd_idx = pmd_index(vaddr);
211 pgd = pgd_base + pgd_idx;
212
213 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200214 pmd = one_md_table_init(pgd);
215 pmd = pmd + pmd_index(vaddr);
Ingo Molnar8550eb92008-01-30 13:34:10 +0100216 for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
217 pmd++, pmd_idx++) {
Jan Beulicha3c60182009-01-16 11:59:33 +0000218 pte = page_table_kmap_check(one_page_table_init(pmd),
219 pmd, vaddr, pte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
221 vaddr += PMD_SIZE;
222 }
223 pmd_idx = 0;
224 }
225}
226
227static inline int is_kernel_text(unsigned long addr)
228{
Matthieu Castet5bd5a452010-11-16 22:31:26 +0100229 if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return 1;
231 return 0;
232}
233
234/*
Ingo Molnar8550eb92008-01-30 13:34:10 +0100235 * This maps the physical memory to kernel virtual address space, a total
236 * of max_low_pfn pages, by creating page tables starting from address
237 * PAGE_OFFSET:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 */
Pekka Enberge53fb042009-03-05 14:55:07 +0200239unsigned long __init
240kernel_physical_mapping_init(unsigned long start,
241 unsigned long end,
242 unsigned long page_size_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
Pekka Enberge53fb042009-03-05 14:55:07 +0200244 int use_pse = page_size_mask == (1<<PG_LEVEL_2M);
Pekka Enbergc1fd1b42010-02-24 17:04:47 +0200245 unsigned long last_map_addr = end;
Pekka Enberge53fb042009-03-05 14:55:07 +0200246 unsigned long start_pfn, end_pfn;
Pekka Enberge7179852009-03-05 14:54:55 +0200247 pgd_t *pgd_base = swapper_pg_dir;
Ingo Molnar8550eb92008-01-30 13:34:10 +0100248 int pgd_idx, pmd_idx, pte_ofs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 unsigned long pfn;
250 pgd_t *pgd;
251 pmd_t *pmd;
252 pte_t *pte;
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700253 unsigned pages_2m, pages_4k;
254 int mapping_iter;
255
Pekka Enberge53fb042009-03-05 14:55:07 +0200256 start_pfn = start >> PAGE_SHIFT;
257 end_pfn = end >> PAGE_SHIFT;
258
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700259 /*
260 * First iteration will setup identity mapping using large/small pages
261 * based on use_pse, with other attributes same as set by
262 * the early code in head_32.S
263 *
264 * Second iteration will setup the appropriate attributes (NX, GLOBAL..)
265 * as desired for the kernel identity mapping.
266 *
267 * This two pass mechanism conforms to the TLB app note which says:
268 *
269 * "Software should not write to a paging-structure entry in a way
270 * that would change, for any linear address, both the page size
271 * and either the page frame or attributes."
272 */
273 mapping_iter = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Yinghai Lua04ad822008-06-29 00:39:06 -0700275 if (!cpu_has_pse)
276 use_pse = 0;
277
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700278repeat:
279 pages_2m = pages_4k = 0;
Yinghai Lua04ad822008-06-29 00:39:06 -0700280 pfn = start_pfn;
281 pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 pgd = pgd_base + pgd_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
284 pmd = one_md_table_init(pgd);
Ingo Molnar8550eb92008-01-30 13:34:10 +0100285
Yinghai Lua04ad822008-06-29 00:39:06 -0700286 if (pfn >= end_pfn)
287 continue;
288#ifdef CONFIG_X86_PAE
289 pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
290 pmd += pmd_idx;
291#else
292 pmd_idx = 0;
293#endif
294 for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;
Jeremy Fitzhardingef3f20de2008-01-30 13:31:09 +0100295 pmd++, pmd_idx++) {
Ingo Molnar8550eb92008-01-30 13:34:10 +0100296 unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Ingo Molnar8550eb92008-01-30 13:34:10 +0100298 /*
299 * Map with big pages if possible, otherwise
300 * create normal page tables:
301 */
Yinghai Lua04ad822008-06-29 00:39:06 -0700302 if (use_pse) {
Ingo Molnar8550eb92008-01-30 13:34:10 +0100303 unsigned int addr2;
Jeremy Fitzhardingef3f20de2008-01-30 13:31:09 +0100304 pgprot_t prot = PAGE_KERNEL_LARGE;
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700305 /*
306 * first pass will use the same initial
307 * identity mapping attribute + _PAGE_PSE.
308 */
309 pgprot_t init_prot =
310 __pgprot(PTE_IDENT_ATTR |
311 _PAGE_PSE);
Jeremy Fitzhardingef3f20de2008-01-30 13:31:09 +0100312
Ingo Molnar8550eb92008-01-30 13:34:10 +0100313 addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
Jeremy Fitzhardingef3f20de2008-01-30 13:31:09 +0100314 PAGE_OFFSET + PAGE_SIZE-1;
315
Ingo Molnar8550eb92008-01-30 13:34:10 +0100316 if (is_kernel_text(addr) ||
317 is_kernel_text(addr2))
Jeremy Fitzhardingef3f20de2008-01-30 13:31:09 +0100318 prot = PAGE_KERNEL_LARGE_EXEC;
319
Andi Kleence0c0e52008-05-02 11:46:49 +0200320 pages_2m++;
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700321 if (mapping_iter == 1)
322 set_pmd(pmd, pfn_pmd(pfn, init_prot));
323 else
324 set_pmd(pmd, pfn_pmd(pfn, prot));
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 pfn += PTRS_PER_PTE;
Ingo Molnar8550eb92008-01-30 13:34:10 +0100327 continue;
328 }
329 pte = one_page_table_init(pmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Yinghai Lua04ad822008-06-29 00:39:06 -0700331 pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
332 pte += pte_ofs;
333 for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;
Ingo Molnar8550eb92008-01-30 13:34:10 +0100334 pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
335 pgprot_t prot = PAGE_KERNEL;
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700336 /*
337 * first pass will use the same initial
338 * identity mapping attribute.
339 */
340 pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR);
Jeremy Fitzhardingef3f20de2008-01-30 13:31:09 +0100341
Ingo Molnar8550eb92008-01-30 13:34:10 +0100342 if (is_kernel_text(addr))
343 prot = PAGE_KERNEL_EXEC;
Jeremy Fitzhardingef3f20de2008-01-30 13:31:09 +0100344
Andi Kleence0c0e52008-05-02 11:46:49 +0200345 pages_4k++;
Pekka Enbergc1fd1b42010-02-24 17:04:47 +0200346 if (mapping_iter == 1) {
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700347 set_pte(pte, pfn_pte(pfn, init_prot));
Pekka Enbergc1fd1b42010-02-24 17:04:47 +0200348 last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE;
349 } else
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700350 set_pte(pte, pfn_pte(pfn, prot));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
352 }
353 }
Suresh Siddhaa2699e42008-09-23 14:00:38 -0700354 if (mapping_iter == 1) {
355 /*
356 * update direct mapping page count only in the first
357 * iteration.
358 */
359 update_page_count(PG_LEVEL_2M, pages_2m);
360 update_page_count(PG_LEVEL_4K, pages_4k);
361
362 /*
363 * local global flush tlb, which will flush the previous
364 * mappings present in both small and large page TLB's.
365 */
366 __flush_tlb_all();
367
368 /*
369 * Second iteration will set the actual desired PTE attributes.
370 */
371 mapping_iter = 2;
372 goto repeat;
373 }
Pekka Enbergc1fd1b42010-02-24 17:04:47 +0200374 return last_map_addr;
Arjan van de Venae531c22008-04-24 23:40:47 +0200375}
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377pte_t *kmap_pte;
378pgprot_t kmap_prot;
379
Ingo Molnar8550eb92008-01-30 13:34:10 +0100380static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr)
381{
382 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
383 vaddr), vaddr), vaddr);
384}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386static void __init kmap_init(void)
387{
388 unsigned long kmap_vstart;
389
Ingo Molnar8550eb92008-01-30 13:34:10 +0100390 /*
391 * Cache the first kmap pte:
392 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
394 kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
395
396 kmap_prot = PAGE_KERNEL;
397}
398
Keith Packardfd940932008-10-30 19:37:09 -0700399#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400static void __init permanent_kmaps_init(pgd_t *pgd_base)
401{
Ingo Molnar8550eb92008-01-30 13:34:10 +0100402 unsigned long vaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 pgd_t *pgd;
404 pud_t *pud;
405 pmd_t *pmd;
406 pte_t *pte;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
408 vaddr = PKMAP_BASE;
409 page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
410
411 pgd = swapper_pg_dir + pgd_index(vaddr);
412 pud = pud_offset(pgd, vaddr);
413 pmd = pmd_offset(pud, vaddr);
414 pte = pte_offset_kernel(pmd, vaddr);
Ingo Molnar8550eb92008-01-30 13:34:10 +0100415 pkmap_page_table = pte;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416}
417
Minchan Kimb1258ac2009-10-22 11:27:22 +0900418static void __init add_one_highpage_init(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
Yinghai Lucc9f7a02008-06-16 16:11:08 -0700420 ClearPageReserved(page);
421 init_page_count(page);
422 __free_page(page);
423 totalhigh_pages++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
425
Yinghai Lu1d931262010-10-05 16:15:15 -0700426void __init add_highpages_with_active_regions(int nid,
427 unsigned long start_pfn, unsigned long end_pfn)
Yinghai Lub5bc6c02008-06-14 18:32:52 -0700428{
Tejun Heo8a9ca342011-07-12 11:16:02 +0200429 phys_addr_t start, end;
430 u64 i;
Yinghai Lub5bc6c02008-06-14 18:32:52 -0700431
Tejun Heo8a9ca342011-07-12 11:16:02 +0200432 for_each_free_mem_range(i, nid, &start, &end, NULL) {
433 unsigned long pfn = clamp_t(unsigned long, PFN_UP(start),
434 start_pfn, end_pfn);
435 unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end),
436 start_pfn, end_pfn);
437 for ( ; pfn < e_pfn; pfn++)
438 if (pfn_valid(pfn))
439 add_one_highpage_init(pfn_to_page(pfn));
Yinghai Lub5bc6c02008-06-14 18:32:52 -0700440 }
Yinghai Lub5bc6c02008-06-14 18:32:52 -0700441}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442#else
Ingo Brueckle8e32322009-01-02 14:42:00 +0100443static inline void permanent_kmaps_init(pgd_t *pgd_base)
444{
445}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446#endif /* CONFIG_HIGHMEM */
447
Attilio Rao7737b212012-08-21 21:22:38 +0100448void __init native_pagetable_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449{
Ian Campbell551889a2008-02-09 23:24:09 +0100450 unsigned long pfn, va;
Attilio Rao73090f82012-08-21 21:22:37 +0100451 pgd_t *pgd, *base = swapper_pg_dir;
Ian Campbell551889a2008-02-09 23:24:09 +0100452 pud_t *pud;
453 pmd_t *pmd;
454 pte_t *pte;
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200455
456 /*
Ian Campbell551889a2008-02-09 23:24:09 +0100457 * Remove any mappings which extend past the end of physical
458 * memory from the boot time page table:
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200459 */
Ian Campbell551889a2008-02-09 23:24:09 +0100460 for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) {
461 va = PAGE_OFFSET + (pfn<<PAGE_SHIFT);
462 pgd = base + pgd_index(va);
463 if (!pgd_present(*pgd))
464 break;
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200465
Ian Campbell551889a2008-02-09 23:24:09 +0100466 pud = pud_offset(pgd, va);
467 pmd = pmd_offset(pud, va);
468 if (!pmd_present(*pmd))
469 break;
470
471 pte = pte_offset_kernel(pmd, va);
472 if (!pte_present(*pte))
473 break;
474
475 pte_clear(NULL, va, pte);
476 }
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700477 paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT);
Attilio Rao843b8ed2012-08-21 21:22:39 +0100478 paging_init();
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200479}
480
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200481/*
482 * Build a proper pagetable for the kernel mappings. Up until this
483 * point, we've been running on some set of pagetables constructed by
484 * the boot process.
485 *
486 * If we're booting on native hardware, this will be a pagetable
Ian Campbell551889a2008-02-09 23:24:09 +0100487 * constructed in arch/x86/kernel/head_32.S. The root of the
488 * pagetable will be swapper_pg_dir.
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200489 *
490 * If we're booting paravirtualized under a hypervisor, then there are
491 * more options: we may already be running PAE, and the pagetable may
492 * or may not be based in swapper_pg_dir. In any case,
Attilio Rao7737b212012-08-21 21:22:38 +0100493 * paravirt_pagetable_init() will set up swapper_pg_dir
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200494 * appropriately for the rest of the initialization to work.
495 *
496 * In general, pagetable_init() assumes that the pagetable may already
497 * be partially populated, and so it avoids stomping on any existing
498 * mappings.
499 */
Pekka Enbergf7650902009-03-05 14:55:05 +0200500void __init early_ioremap_page_table_range_init(void)
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200501{
Pekka Enberge7179852009-03-05 14:54:55 +0200502 pgd_t *pgd_base = swapper_pg_dir;
Ingo Molnar8550eb92008-01-30 13:34:10 +0100503 unsigned long vaddr, end;
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 /*
506 * Fixed mappings, only the page table structure has to be
507 * created - mappings will be set by set_fixmap():
508 */
509 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
Jeremy Fitzhardingeb239fb22007-05-02 19:27:13 +0200510 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
511 page_table_range_init(vaddr, end, pgd_base);
Huang, Yingbeacfaa2008-01-30 13:33:44 +0100512 early_ioremap_reset();
Yinghai Lue7b37892008-06-25 21:51:28 -0700513}
514
515static void __init pagetable_init(void)
516{
517 pgd_t *pgd_base = swapper_pg_dir;
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 permanent_kmaps_init(pgd_base);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520}
521
Jeremy Fitzhardingebe43d722008-09-07 15:21:13 -0700522pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP);
Jeremy Fitzhardinge6fdc05d2008-01-30 13:32:57 +0100523EXPORT_SYMBOL_GPL(__supported_pte_mask);
524
Yinghai Lu90d967e2008-06-23 21:00:45 +0200525/* user-defined highmem size */
526static unsigned int highmem_pages = -1;
527
528/*
529 * highmem=size forces highmem to be exactly 'size' bytes.
530 * This works even on boxes that have no highmem otherwise.
531 * This also works to reduce highmem size on bigger boxes.
532 */
533static int __init parse_highmem(char *arg)
534{
535 if (!arg)
536 return -EINVAL;
537
538 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
539 return 0;
540}
541early_param("highmem", parse_highmem);
542
Ingo Molnar47698432009-02-12 13:31:41 +0100543#define MSG_HIGHMEM_TOO_BIG \
544 "highmem size (%luMB) is bigger than pages available (%luMB)!\n"
545
546#define MSG_LOWMEM_TOO_SMALL \
547 "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n"
548/*
549 * All of RAM fits into lowmem - but if user wants highmem
550 * artificially via the highmem=x boot parameter then create
551 * it:
552 */
553void __init lowmem_pfn_init(void)
554{
Ingo Molnard88316c22009-02-12 15:16:03 +0100555 /* max_low_pfn is 0, we already have early_res support */
556 max_low_pfn = max_pfn;
557
Ingo Molnar47698432009-02-12 13:31:41 +0100558 if (highmem_pages == -1)
559 highmem_pages = 0;
560#ifdef CONFIG_HIGHMEM
561 if (highmem_pages >= max_pfn) {
562 printk(KERN_ERR MSG_HIGHMEM_TOO_BIG,
563 pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
564 highmem_pages = 0;
565 }
566 if (highmem_pages) {
567 if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) {
568 printk(KERN_ERR MSG_LOWMEM_TOO_SMALL,
569 pages_to_mb(highmem_pages));
570 highmem_pages = 0;
571 }
572 max_low_pfn -= highmem_pages;
573 }
574#else
575 if (highmem_pages)
576 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
577#endif
578}
579
580#define MSG_HIGHMEM_TOO_SMALL \
581 "only %luMB highmem pages available, ignoring highmem size of %luMB!\n"
582
583#define MSG_HIGHMEM_TRIMMED \
584 "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n"
585/*
586 * We have more RAM than fits into lowmem - we try to put it into
587 * highmem, also taking the highmem=x boot parameter into account:
588 */
589void __init highmem_pfn_init(void)
590{
Ingo Molnard88316c22009-02-12 15:16:03 +0100591 max_low_pfn = MAXMEM_PFN;
592
Ingo Molnar47698432009-02-12 13:31:41 +0100593 if (highmem_pages == -1)
594 highmem_pages = max_pfn - MAXMEM_PFN;
595
596 if (highmem_pages + MAXMEM_PFN < max_pfn)
597 max_pfn = MAXMEM_PFN + highmem_pages;
598
599 if (highmem_pages + MAXMEM_PFN > max_pfn) {
600 printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL,
601 pages_to_mb(max_pfn - MAXMEM_PFN),
602 pages_to_mb(highmem_pages));
603 highmem_pages = 0;
604 }
Ingo Molnar47698432009-02-12 13:31:41 +0100605#ifndef CONFIG_HIGHMEM
606 /* Maximum memory usable is what is directly addressable */
607 printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20);
608 if (max_pfn > MAX_NONPAE_PFN)
609 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
610 else
611 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
612 max_pfn = MAXMEM_PFN;
613#else /* !CONFIG_HIGHMEM */
614#ifndef CONFIG_HIGHMEM64G
615 if (max_pfn > MAX_NONPAE_PFN) {
616 max_pfn = MAX_NONPAE_PFN;
617 printk(KERN_WARNING MSG_HIGHMEM_TRIMMED);
618 }
619#endif /* !CONFIG_HIGHMEM64G */
620#endif /* !CONFIG_HIGHMEM */
621}
622
Yinghai Lu90d967e2008-06-23 21:00:45 +0200623/*
624 * Determine low and high memory ranges:
625 */
Yinghai Lu2ec65f82008-06-23 03:05:30 -0700626void __init find_low_pfn_range(void)
Yinghai Lu90d967e2008-06-23 21:00:45 +0200627{
Yinghai Lu2ec65f82008-06-23 03:05:30 -0700628 /* it could update max_pfn */
629
Ingo Molnard88316c22009-02-12 15:16:03 +0100630 if (max_pfn <= MAXMEM_PFN)
Ingo Molnar47698432009-02-12 13:31:41 +0100631 lowmem_pfn_init();
Ingo Molnard88316c22009-02-12 15:16:03 +0100632 else
633 highmem_pfn_init();
Yinghai Lu90d967e2008-06-23 21:00:45 +0200634}
635
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700636#ifndef CONFIG_NEED_MULTIPLE_NODES
Tejun Heod8fc3af2011-02-16 12:13:06 +0100637void __init initmem_init(void)
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700638{
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700639#ifdef CONFIG_HIGHMEM
640 highstart_pfn = highend_pfn = max_pfn;
641 if (max_pfn > max_low_pfn)
642 highstart_pfn = max_low_pfn;
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700643 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
644 pages_to_mb(highend_pfn - highstart_pfn));
645 num_physpages = highend_pfn;
646 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
647#else
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700648 num_physpages = max_low_pfn;
649 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
650#endif
Tejun Heo0608f702011-07-14 11:44:23 +0200651
652 memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0);
653 sparse_memory_present_with_active_regions(0);
654
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700655#ifdef CONFIG_FLATMEM
656 max_mapnr = num_physpages;
657#endif
Jeremy Fitzhardingedc16ecf2009-03-04 16:10:44 -0800658 __vmalloc_start_set = true;
659
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700660 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
661 pages_to_mb(max_low_pfn));
662
663 setup_bootmem_allocator();
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700664}
Yinghai Lucb95a132008-07-02 00:31:02 -0700665#endif /* !CONFIG_NEED_MULTIPLE_NODES */
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700666
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700667void __init setup_bootmem_allocator(void)
668{
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700669 printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
670 max_pfn_mapped<<PAGE_SHIFT);
Yinghai Lufc5efe32009-03-04 12:21:24 -0800671 printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
Yinghai Lub2ac82a2008-06-22 02:45:39 -0700672
Pekka Enbergc4645732009-03-05 14:54:58 +0200673 after_bootmem = 1;
Yinghai Lu4e296842008-06-24 12:18:14 -0700674}
675
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676/*
677 * paging_init() sets up the page tables - note that the first 8MB are
678 * already mapped by head.S.
679 *
680 * This routines also unmaps the page at virtual kernel address 0, so
681 * that we can trap those pesky NULL-reference errors in the kernel.
682 */
683void __init paging_init(void)
684{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 pagetable_init();
686
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 __flush_tlb_all();
688
689 kmap_init();
Yinghai Lu11cd0bc2008-06-23 19:51:10 -0700690
691 /*
692 * NOTE: at this point the bootmem allocator is fully available.
693 */
Andres Salomonc10d1e22010-11-17 06:09:52 +0000694 olpc_dt_build_devicetree();
Tejun Heo797390d2011-05-02 14:18:52 +0200695 sparse_memory_present_with_active_regions(MAX_NUMNODES);
Yinghai Lu11cd0bc2008-06-23 19:51:10 -0700696 sparse_init();
697 zone_sizes_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698}
699
700/*
701 * Test if the WP bit works in supervisor mode. It isn't supported on 386's
Dmitri Vorobievf7f17a62008-04-21 00:47:55 +0400702 * and also on some strange 486's. All 586+'s are OK. This used to involve
703 * black magic jumps to work around some nasty CPU bugs, but fortunately the
704 * switch to using exceptions got rid of all that.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706static void __init test_wp_bit(void)
707{
Ingo Molnard7d119d2008-01-30 13:34:10 +0100708 printk(KERN_INFO
709 "Checking if this processor honours the WP bit even in supervisor mode...");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
711 /* Any page-aligned address will do, the test is non-destructive */
H. Peter Anvin8bd753b2012-09-21 12:43:06 -0700712 __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 boot_cpu_data.wp_works_ok = do_test_wp_bit();
714 clear_fixmap(FIX_WP_TEST);
715
716 if (!boot_cpu_data.wp_works_ok) {
Ingo Molnard7d119d2008-01-30 13:34:10 +0100717 printk(KERN_CONT "No.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718#ifdef CONFIG_X86_WP_WORKS_OK
Ingo Molnard7d119d2008-01-30 13:34:10 +0100719 panic(
720 "This kernel doesn't support CPU's with broken WP. Recompile it for a 386!");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721#endif
722 } else {
Ingo Molnard7d119d2008-01-30 13:34:10 +0100723 printk(KERN_CONT "Ok.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 }
725}
726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727void __init mem_init(void)
728{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 int codesize, reservedpages, datasize, initsize;
Yinghai Lucc9f7a02008-06-16 16:11:08 -0700730 int tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
Jeremy Fitzhardingecfb80c92008-12-16 12:17:36 -0800732 pci_iommu_alloc();
733
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700734#ifdef CONFIG_FLATMEM
Eric Sesterhenn8d8f3cb2006-10-03 23:34:58 +0200735 BUG_ON(!mem_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736#endif
Stanislaw Gruszka855c7432011-12-06 09:08:34 +0100737 /*
738 * With CONFIG_DEBUG_PAGEALLOC initialization of highmem pages has to
739 * be done before free_all_bootmem(). Memblock use free low memory for
740 * temporary data (see find_range_array()) and for this purpose can use
741 * pages that was already passed to the buddy allocator, hence marked as
742 * not accessible in the page tables when compiled with
743 * CONFIG_DEBUG_PAGEALLOC. Otherwise order of initialization is not
744 * important here.
745 */
746 set_highmem_pages_init();
747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 /* this will put all low memory onto the freelists */
749 totalram_pages += free_all_bootmem();
750
751 reservedpages = 0;
752 for (tmp = 0; tmp < max_low_pfn; tmp++)
753 /*
Ingo Molnar8550eb92008-01-30 13:34:10 +0100754 * Only count reserved RAM pages:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 */
756 if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
757 reservedpages++;
758
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 codesize = (unsigned long) &_etext - (unsigned long) &_text;
760 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
761 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
762
Ingo Molnar8550eb92008-01-30 13:34:10 +0100763 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
764 "%dk reserved, %dk data, %dk init, %ldk highmem)\n",
Geert Uytterhoevencc013a82009-09-21 17:02:36 -0700765 nr_free_pages() << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 num_physpages << (PAGE_SHIFT-10),
767 codesize >> 10,
768 reservedpages << (PAGE_SHIFT-10),
769 datasize >> 10,
770 initsize >> 10,
Andreas Fenkart4b529402010-01-08 14:42:31 -0800771 totalhigh_pages << (PAGE_SHIFT-10));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Ingo Molnard7d119d2008-01-30 13:34:10 +0100773 printk(KERN_INFO "virtual kernel memory layout:\n"
Ingo Molnar8550eb92008-01-30 13:34:10 +0100774 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700775#ifdef CONFIG_HIGHMEM
Ingo Molnar8550eb92008-01-30 13:34:10 +0100776 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700777#endif
Ingo Molnar8550eb92008-01-30 13:34:10 +0100778 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
779 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
780 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
781 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
782 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
783 FIXADDR_START, FIXADDR_TOP,
784 (FIXADDR_TOP - FIXADDR_START) >> 10,
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700785
786#ifdef CONFIG_HIGHMEM
Ingo Molnar8550eb92008-01-30 13:34:10 +0100787 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
788 (LAST_PKMAP*PAGE_SIZE) >> 10,
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700789#endif
790
Ingo Molnar8550eb92008-01-30 13:34:10 +0100791 VMALLOC_START, VMALLOC_END,
792 (VMALLOC_END - VMALLOC_START) >> 20,
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700793
Ingo Molnar8550eb92008-01-30 13:34:10 +0100794 (unsigned long)__va(0), (unsigned long)high_memory,
795 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700796
Ingo Molnar8550eb92008-01-30 13:34:10 +0100797 (unsigned long)&__init_begin, (unsigned long)&__init_end,
798 ((unsigned long)&__init_end -
799 (unsigned long)&__init_begin) >> 10,
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700800
Ingo Molnar8550eb92008-01-30 13:34:10 +0100801 (unsigned long)&_etext, (unsigned long)&_edata,
802 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700803
Ingo Molnar8550eb92008-01-30 13:34:10 +0100804 (unsigned long)&_text, (unsigned long)&_etext,
805 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700806
Jan Beulichbeeb4192008-12-16 11:45:56 +0000807 /*
808 * Check boundaries twice: Some fundamental inconsistencies can
809 * be detected at build time already.
810 */
811#define __FIXADDR_TOP (-PAGE_SIZE)
812#ifdef CONFIG_HIGHMEM
813 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
814 BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE);
815#endif
816#define high_memory (-128UL << 20)
817 BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
818#undef high_memory
819#undef __FIXADDR_TOP
820
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700821#ifdef CONFIG_HIGHMEM
Ingo Molnar8550eb92008-01-30 13:34:10 +0100822 BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
823 BUG_ON(VMALLOC_END > PKMAP_BASE);
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700824#endif
Jan Beulichbeeb4192008-12-16 11:45:56 +0000825 BUG_ON(VMALLOC_START >= VMALLOC_END);
Ingo Molnar8550eb92008-01-30 13:34:10 +0100826 BUG_ON((unsigned long)high_memory > VMALLOC_START);
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 if (boot_cpu_data.wp_works_ok < 0)
829 test_wp_bit();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
831
KAMEZAWA Hiroyukiad8f5792006-05-20 15:00:03 -0700832#ifdef CONFIG_MEMORY_HOTPLUG
Yasunori Gotobc02af92006-06-27 02:53:30 -0700833int arch_add_memory(int nid, u64 start, u64 size)
Dave Hansen05039b92005-10-29 18:16:57 -0700834{
Yasunori Goto7c7e9422006-12-22 01:11:13 -0800835 struct pglist_data *pgdata = NODE_DATA(nid);
Christoph Lameter776ed982006-09-25 23:31:09 -0700836 struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM;
Dave Hansen05039b92005-10-29 18:16:57 -0700837 unsigned long start_pfn = start >> PAGE_SHIFT;
838 unsigned long nr_pages = size >> PAGE_SHIFT;
839
Gary Hadec04fc582009-01-06 14:39:14 -0800840 return __add_pages(nid, zone, start_pfn, nr_pages);
Dave Hansen05039b92005-10-29 18:16:57 -0700841}
Andi Kleen9d99aaa2006-04-07 19:49:15 +0200842#endif
Dave Hansen05039b92005-10-29 18:16:57 -0700843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844/*
845 * This function cannot be __init, since exceptions don't work in that
846 * section. Put this after the callers, so that it cannot be inlined.
847 */
Ingo Molnar8550eb92008-01-30 13:34:10 +0100848static noinline int do_test_wp_bit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849{
850 char tmp_reg;
851 int flag;
852
853 __asm__ __volatile__(
Ingo Molnar8550eb92008-01-30 13:34:10 +0100854 " movb %0, %1 \n"
855 "1: movb %1, %0 \n"
856 " xorl %2, %2 \n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 "2: \n"
H. Peter Anvinf832ff12008-02-04 16:47:58 +0100858 _ASM_EXTABLE(1b,2b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)),
860 "=q" (tmp_reg),
861 "=r" (flag)
862 :"2" (1)
863 :"memory");
Ingo Molnar8550eb92008-01-30 13:34:10 +0100864
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 return flag;
866}
867
Arjan van de Ven63aaf302006-01-06 00:12:02 -0800868#ifdef CONFIG_DEBUG_RODATA
Arjan van de Venedeed302008-01-30 13:34:08 +0100869const int rodata_test_data = 0xC3;
870EXPORT_SYMBOL_GPL(rodata_test_data);
Arjan van de Ven63aaf302006-01-06 00:12:02 -0800871
Suresh Siddha502f6602009-10-28 18:46:56 -0800872int kernel_set_to_readonly __read_mostly;
Steven Rostedt16239632009-02-17 17:57:30 -0500873
874void set_kernel_text_rw(void)
875{
876 unsigned long start = PFN_ALIGN(_text);
877 unsigned long size = PFN_ALIGN(_etext) - start;
878
879 if (!kernel_set_to_readonly)
880 return;
881
882 pr_debug("Set kernel text: %lx - %lx for read write\n",
883 start, start+size);
884
885 set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
886}
887
888void set_kernel_text_ro(void)
889{
890 unsigned long start = PFN_ALIGN(_text);
891 unsigned long size = PFN_ALIGN(_etext) - start;
892
893 if (!kernel_set_to_readonly)
894 return;
895
896 pr_debug("Set kernel text: %lx - %lx for read only\n",
897 start, start+size);
898
899 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
900}
901
Matthieu Castet5bd5a452010-11-16 22:31:26 +0100902static void mark_nxdata_nx(void)
903{
904 /*
905 * When this called, init has already been executed and released,
Lucas De Marchi0d2eb442011-03-17 16:24:16 -0300906 * so everything past _etext should be NX.
Matthieu Castet5bd5a452010-11-16 22:31:26 +0100907 */
908 unsigned long start = PFN_ALIGN(_etext);
909 /*
910 * This comes from is_kernel_text upper limit. Also HPAGE where used:
911 */
912 unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start;
913
914 if (__supported_pte_mask & _PAGE_NX)
915 printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10);
916 set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT);
917}
918
Arjan van de Ven63aaf302006-01-06 00:12:02 -0800919void mark_rodata_ro(void)
920{
Jan Beulich6fb14752007-05-02 19:27:10 +0200921 unsigned long start = PFN_ALIGN(_text);
922 unsigned long size = PFN_ALIGN(_etext) - start;
Arjan van de Ven63aaf302006-01-06 00:12:02 -0800923
Mathieu Desnoyers4e4eee02008-02-02 15:42:20 -0500924 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
925 printk(KERN_INFO "Write protecting the kernel text: %luk\n",
926 size >> 10);
Andi Kleen0c42f392008-01-30 13:33:42 +0100927
Steven Rostedt16239632009-02-17 17:57:30 -0500928 kernel_set_to_readonly = 1;
929
Andi Kleen0c42f392008-01-30 13:33:42 +0100930#ifdef CONFIG_CPA_DEBUG
Mathieu Desnoyers4e4eee02008-02-02 15:42:20 -0500931 printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n",
932 start, start+size);
933 set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT);
Andi Kleen0c42f392008-01-30 13:33:42 +0100934
Mathieu Desnoyers4e4eee02008-02-02 15:42:20 -0500935 printk(KERN_INFO "Testing CPA: write protecting again\n");
936 set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
Linus Torvalds602033e2007-07-26 12:07:21 -0700937#endif
Steven Rostedt8f0f9962008-05-12 21:20:56 +0200938
Jan Beulich6fb14752007-05-02 19:27:10 +0200939 start += size;
940 size = (unsigned long)__end_rodata - start;
Arjan van de Ven6d238cc2008-01-30 13:34:06 +0100941 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
Ingo Molnard7d119d2008-01-30 13:34:10 +0100942 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
943 size >> 10);
Arjan van de Venedeed302008-01-30 13:34:08 +0100944 rodata_test();
Arjan van de Ven63aaf302006-01-06 00:12:02 -0800945
Andi Kleen0c42f392008-01-30 13:33:42 +0100946#ifdef CONFIG_CPA_DEBUG
Ingo Molnard7d119d2008-01-30 13:34:10 +0100947 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size);
Arjan van de Ven6d238cc2008-01-30 13:34:06 +0100948 set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
Andi Kleen0c42f392008-01-30 13:33:42 +0100949
Ingo Molnard7d119d2008-01-30 13:34:10 +0100950 printk(KERN_INFO "Testing CPA: write protecting again\n");
Arjan van de Ven6d238cc2008-01-30 13:34:06 +0100951 set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
Andi Kleen0c42f392008-01-30 13:33:42 +0100952#endif
Matthieu Castet5bd5a452010-11-16 22:31:26 +0100953 mark_nxdata_nx();
Arjan van de Ven63aaf302006-01-06 00:12:02 -0800954}
955#endif
956