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| author | Will Deacon <will.deacon@arm.com> | 2011-09-30 11:43:29 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2011-12-06 14:04:14 +0000 |
| commit | 8903826d0cd99aed9267e792d38284cf3092042b (patch) | |
| tree | ec75fed09f62c215e2057d8c5e82c343e627c8fe /arch/arm/kernel | |
| parent | ba8bb18a03f8c7508565c385576a5431a4ad804a (diff) | |
| download | op-kernel-dev-8903826d0cd99aed9267e792d38284cf3092042b.zip op-kernel-dev-8903826d0cd99aed9267e792d38284cf3092042b.tar.gz | |
ARM: idmap: populate identity map pgd at init time using .init.text
When disabling and re-enabling the MMU, it is necessary to take out an
identity mapping for the code that manipulates the SCTLR in order to
avoid it disappearing from under our feet. This is useful when soft
rebooting and returning from CPU suspend.
This patch allocates a set of page tables during boot and populates them
with an identity mapping for the .idmap.text section. This means that
users of the identity map do not need to manage their own pgd and can
instead annotate their functions with __idmap or, in the case of assembly
code, place them in the correct section.
Acked-by: Dave Martin <dave.martin@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/smp.c | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/vmlinux.lds.S | 7 |
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index ef5640b..8afadda 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -31,6 +31,7 @@ #include <asm/cpu.h> #include <asm/cputype.h> #include <asm/exception.h> +#include <asm/idmap.h> #include <asm/topology.h> #include <asm/mmu_context.h> #include <asm/pgtable.h> diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index 20b3041..f76e755 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -13,6 +13,12 @@ *(.proc.info.init) \ VMLINUX_SYMBOL(__proc_info_end) = .; +#define IDMAP_TEXT \ + ALIGN_FUNCTION(); \ + VMLINUX_SYMBOL(__idmap_text_start) = .; \ + *(.idmap.text) \ + VMLINUX_SYMBOL(__idmap_text_end) = .; + #ifdef CONFIG_HOTPLUG_CPU #define ARM_CPU_DISCARD(x) #define ARM_CPU_KEEP(x) x @@ -92,6 +98,7 @@ SECTIONS SCHED_TEXT LOCK_TEXT KPROBES_TEXT + IDMAP_TEXT #ifdef CONFIG_MMU *(.fixup) #endif |
