summaryrefslogtreecommitdiff
path: root/arch/arm/mm/idmap.c
diff options
context:
space:
mode:
authorRussell King <rmk+kernel@arm.linux.org.uk>2010-11-21 11:41:57 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-12-22 11:05:33 +0000
commit614dd0585f376a25c638abbed9c5fbd21d7baece (patch)
tree9bd2c8bb3523632901e3ddc3f9b1eba24e7671ab /arch/arm/mm/idmap.c
parent26bbf0b57a0848932f725076bcb1245ca696e8d3 (diff)
ARM: pgtable: collect up identity mapping functions
We have two places where we create identity mappings - one when we bring secondary CPUs online, and one where we setup some mappings for soft- reboot. Combine these two into a single implementation. Also collect the identity mapping deletion function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/idmap.c')
-rw-r--r--arch/arm/mm/idmap.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
new file mode 100644
index 000000000000..034124d1272d
--- /dev/null
+++ b/arch/arm/mm/idmap.c
@@ -0,0 +1,51 @@
+#include <linux/kernel.h>
+
+#include <asm/cputype.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+
+void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
+{
+ unsigned long prot;
+
+ prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE;
+ if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
+ prot |= PMD_BIT4;
+
+ for (addr &= PGDIR_MASK; addr < end;) {
+ pmd_t *pmd = pmd_offset(pgd + pgd_index(addr), addr);
+ pmd[0] = __pmd(addr | prot);
+ addr += SECTION_SIZE;
+ pmd[1] = __pmd(addr | prot);
+ addr += SECTION_SIZE;
+ flush_pmd_entry(pmd);
+ }
+}
+
+#ifdef CONFIG_SMP
+void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end)
+{
+ for (addr &= PGDIR_MASK; addr < end; addr += PGDIR_SIZE) {
+ pmd_t *pmd = pmd_offset(pgd + pgd_index(addr), addr);
+ pmd[0] = __pmd(0);
+ pmd[1] = __pmd(0);
+ clean_pmd_entry(pmd);
+ }
+}
+#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();
+}