#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(char mode) { /* * 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(); }