blob: 2be9139a4ef3cc5af97f03a30eefefe7d019740e [file] [log] [blame]
Russell King614dd052010-11-21 11:41:57 +00001#include <linux/kernel.h>
2
3#include <asm/cputype.h>
4#include <asm/pgalloc.h>
5#include <asm/pgtable.h>
6
Russell King516295e2010-11-21 16:27:49 +00007static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end,
Russell Kingaf3813d2010-11-21 11:48:16 +00008 unsigned long prot)
9{
Russell King516295e2010-11-21 16:27:49 +000010 pmd_t *pmd = pmd_offset(pud, addr);
Russell Kingaf3813d2010-11-21 11:48:16 +000011
12 addr = (addr & PMD_MASK) | prot;
13 pmd[0] = __pmd(addr);
14 addr += SECTION_SIZE;
15 pmd[1] = __pmd(addr);
16 flush_pmd_entry(pmd);
17}
18
Russell King516295e2010-11-21 16:27:49 +000019static void idmap_add_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
20 unsigned long prot)
21{
22 pud_t *pud = pud_offset(pgd, addr);
23 unsigned long next;
24
25 do {
26 next = pud_addr_end(addr, end);
27 idmap_add_pmd(pud, addr, next, prot);
28 } while (pud++, addr = next, addr != end);
29}
30
Russell King614dd052010-11-21 11:41:57 +000031void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
32{
Russell Kingaf3813d2010-11-21 11:48:16 +000033 unsigned long prot, next;
Russell King614dd052010-11-21 11:41:57 +000034
35 prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE;
36 if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
37 prot |= PMD_BIT4;
38
Russell Kingaf3813d2010-11-21 11:48:16 +000039 pgd += pgd_index(addr);
40 do {
41 next = pgd_addr_end(addr, end);
Russell King516295e2010-11-21 16:27:49 +000042 idmap_add_pud(pgd, addr, next, prot);
Russell Kingaf3813d2010-11-21 11:48:16 +000043 } while (pgd++, addr = next, addr != end);
Russell King614dd052010-11-21 11:41:57 +000044}
45
46#ifdef CONFIG_SMP
Russell King516295e2010-11-21 16:27:49 +000047static void idmap_del_pmd(pud_t *pud, unsigned long addr, unsigned long end)
Russell Kingaf3813d2010-11-21 11:48:16 +000048{
Russell King516295e2010-11-21 16:27:49 +000049 pmd_t *pmd = pmd_offset(pud, addr);
Russell Kingaf3813d2010-11-21 11:48:16 +000050 pmd_clear(pmd);
51}
52
Russell King516295e2010-11-21 16:27:49 +000053static void idmap_del_pud(pgd_t *pgd, unsigned long addr, unsigned long end)
54{
55 pud_t *pud = pud_offset(pgd, addr);
56 unsigned long next;
57
58 do {
59 next = pud_addr_end(addr, end);
60 idmap_del_pmd(pud, addr, next);
61 } while (pud++, addr = next, addr != end);
62}
63
Russell King614dd052010-11-21 11:41:57 +000064void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end)
65{
Russell Kingaf3813d2010-11-21 11:48:16 +000066 unsigned long next;
67
68 pgd += pgd_index(addr);
69 do {
70 next = pgd_addr_end(addr, end);
Russell King516295e2010-11-21 16:27:49 +000071 idmap_del_pud(pgd, addr, next);
Russell Kingaf3813d2010-11-21 11:48:16 +000072 } while (pgd++, addr = next, addr != end);
Russell King614dd052010-11-21 11:41:57 +000073}
74#endif
75
76/*
77 * In order to soft-boot, we need to insert a 1:1 mapping in place of
78 * the user-mode pages. This will then ensure that we have predictable
79 * results when turning the mmu off
80 */
81void setup_mm_for_reboot(char mode)
82{
83 /*
84 * We need to access to user-mode page tables here. For kernel threads
85 * we don't have any user-mode mappings so we use the context that we
86 * "borrowed".
87 */
88 identity_mapping_add(current->active_mm->pgd, 0, TASK_SIZE);
89 local_flush_tlb_all();
90}