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arm64: Calculate size for idmap_pg_dir at compile time

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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>
This commit is contained in:
Suzuki K. Poulose 2015-10-19 14:19:30 +01:00 committed by Catalin Marinas
parent 686e783869
commit c265af51c5
1 changed files with 5 additions and 2 deletions
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7
arch/arm64/include/asm/kernel-pgtable.h
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@ -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