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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/mmu.c
parent26bbf0b57a0848932f725076bcb1245ca696e8d3 (diff)
downloadop-kernel-dev-614dd0585f376a25c638abbed9c5fbd21d7baece.zip
op-kernel-dev-614dd0585f376a25c638abbed9c5fbd21d7baece.tar.gz
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/mmu.c')
-rw-r--r--arch/arm/mm/mmu.c35
1 files changed, 0 insertions, 35 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 94ee093..bd1a11e 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1045,38 +1045,3 @@ void __init paging_init(struct machine_desc *mdesc)
empty_zero_page = virt_to_page(zero_page);
__flush_dcache_page(NULL, empty_zero_page);
}
-
-/*
- * 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)
-{
- unsigned long base_pmdval;
- pgd_t *pgd;
- int i;
-
- /*
- * 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".
- */
- pgd = current->active_mm->pgd;
-
- base_pmdval = PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | PMD_TYPE_SECT;
- if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
- base_pmdval |= PMD_BIT4;
-
- for (i = 0; i < FIRST_USER_PGD_NR + USER_PTRS_PER_PGD; i++, pgd++) {
- unsigned long pmdval = (i << PGDIR_SHIFT) | base_pmdval;
- pmd_t *pmd;
-
- pmd = pmd_off(pgd, i << PGDIR_SHIFT);
- pmd[0] = __pmd(pmdval);
- pmd[1] = __pmd(pmdval + (1 << (PGDIR_SHIFT - 1)));
- flush_pmd_entry(pmd);
- }
-
- local_flush_tlb_all();
-}
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