| #include <linux/kernel.h> |
| |
| #include <asm/cputype.h> |
| #include <asm/pgalloc.h> |
| #include <asm/pgtable.h> |
| |
| static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end, |
| unsigned long prot) |
| { |
| pmd_t *pmd = pmd_offset(pud, addr); |
| |
| addr = (addr & PMD_MASK) | prot; |
| pmd[0] = __pmd(addr); |
| addr += SECTION_SIZE; |
| pmd[1] = __pmd(addr); |
| flush_pmd_entry(pmd); |
| } |
| |
| static void idmap_add_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
| unsigned long prot) |
| { |
| pud_t *pud = pud_offset(pgd, addr); |
| unsigned long next; |
| |
| do { |
| next = pud_addr_end(addr, end); |
| idmap_add_pmd(pud, addr, next, prot); |
| } while (pud++, addr = next, addr != end); |
| } |
| |
| void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end) |
| { |
| unsigned long prot, next; |
| |
| prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE; |
| if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale()) |
| prot |= PMD_BIT4; |
| |
| pgd += pgd_index(addr); |
| do { |
| next = pgd_addr_end(addr, end); |
| idmap_add_pud(pgd, addr, next, prot); |
| } while (pgd++, addr = next, addr != end); |
| } |
| |
| #ifdef CONFIG_SMP |
| static void idmap_del_pmd(pud_t *pud, unsigned long addr, unsigned long end) |
| { |
| pmd_t *pmd = pmd_offset(pud, addr); |
| pmd_clear(pmd); |
| } |
| |
| static void idmap_del_pud(pgd_t *pgd, unsigned long addr, unsigned long end) |
| { |
| pud_t *pud = pud_offset(pgd, addr); |
| unsigned long next; |
| |
| do { |
| next = pud_addr_end(addr, end); |
| idmap_del_pmd(pud, addr, next); |
| } while (pud++, addr = next, addr != end); |
| } |
| |
| void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end) |
| { |
| unsigned long next; |
| |
| pgd += pgd_index(addr); |
| do { |
| next = pgd_addr_end(addr, end); |
| idmap_del_pud(pgd, addr, next); |
| } while (pgd++, addr = next, addr != end); |
| } |
| #endif |
| |
| /* |
| * In order to soft-boot, we need to insert a 1:1 mapping in place of |
| * the user-mode pages. This will then ensure that we have predictable |
| * results when turning the mmu off |
| */ |
| void setup_mm_for_reboot(void) |
| { |
| /* |
| * We need to access to user-mode page tables here. For kernel threads |
| * we don't have any user-mode mappings so we use the context that we |
| * "borrowed". |
| */ |
| identity_mapping_add(current->active_mm->pgd, 0, TASK_SIZE); |
| local_flush_tlb_all(); |
| } |