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| author |   Suzuki K. Poulose <suzuki.poulose@arm.com> | 2015-10-19 14:19:30 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2015-10-19 17:53:26 +0100 |
| commit | c265af51c5f17ec5c0cf0d960133bd6fe5f39eb9 (patch) | |
| tree | 5eec359c8588aeab79324f7f52e5f0c3b6ae942d /arch/arm64 | |
| parent | arm64: Introduce helpers for page table levels (diff) | |
| download | linux-dev-c265af51c5f17ec5c0cf0d960133bd6fe5f39eb9.tar.xz linux-dev-c265af51c5f17ec5c0cf0d960133bd6fe5f39eb9.zip | |
arm64: Calculate size for idmap_pg_dir at compile time
Now that we can calculate the number of levels required for
mapping a va width, reserve exact number of pages that would
be required to cover the idmap. The idmap should be able to handle
the maximum physical address size supported.
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/kernel-pgtable.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h index 4e08faabd9e4..a459714ee29e 100644 --- a/arch/arm64/include/asm/kernel-pgtable.h +++ b/arch/arm64/include/asm/kernel-pgtable.h @@ -39,16 +39,19 @@ * map to pte level. The swapper also maps the FDT (see __create_page_tables * for more information). Note that the number of ID map translation levels * could be increased on the fly if system RAM is out of reach for the default - * VA range, so 3 pages are reserved in all cases. + * VA range, so pages required to map highest possible PA are reserved in all + * cases. */ #if ARM64_SWAPPER_USES_SECTION_MAPS #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1) +#define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT) - 1) #else #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS) +#define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT)) #endif #define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE) -#define IDMAP_DIR_SIZE (3 * PAGE_SIZE) +#define IDMAP_DIR_SIZE (IDMAP_PGTABLE_LEVELS * PAGE_SIZE) /* Initial memory map size */ #if ARM64_SWAPPER_USES_SECTION_MAPS |