1 #include <linux/kernel.h>
3 #include <asm/cputype.h>
4 #include <asm/pgalloc.h>
5 #include <asm/pgtable.h>
7 void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
11 prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE;
12 if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
15 for (addr &= PGDIR_MASK; addr < end;) {
16 pmd_t *pmd = pmd_offset(pgd + pgd_index(addr), addr);
17 pmd[0] = __pmd(addr | prot);
19 pmd[1] = __pmd(addr | prot);
26 void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end)
28 for (addr &= PGDIR_MASK; addr < end; addr += PGDIR_SIZE) {
29 pmd_t *pmd = pmd_offset(pgd + pgd_index(addr), addr);
38 * In order to soft-boot, we need to insert a 1:1 mapping in place of
39 * the user-mode pages. This will then ensure that we have predictable
40 * results when turning the mmu off
42 void setup_mm_for_reboot(char mode)
45 * We need to access to user-mode page tables here. For kernel threads
46 * we don't have any user-mode mappings so we use the context that we
49 identity_mapping_add(current->active_mm->pgd, 0, TASK_SIZE);
50 local_flush_tlb_all();