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| Started by | "Suzuki K. Poulose" <suzuki.poulose@arm.com> |
|---|---|
| First post | 2015-09-15 17:50 +0200 |
| Last post | 2015-09-15 17:50 +0200 |
| Articles | 1 — 1 participant |
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[PATCH 04/15] arm64: Calculate size for idmap_pg_dir at compile time "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-15 17:50 +0200
| From | "Suzuki K. Poulose" <suzuki.poulose@arm.com> |
|---|---|
| Date | 2015-09-15 17:50 +0200 |
| Subject | [PATCH 04/15] arm64: Calculate size for idmap_pg_dir at compile time |
| Message-ID | <q90Ez-Jd-43@gated-at.bofh.it> |
From: "Suzuki K. Poulose" <suzuki.poulose@arm.com> 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: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> 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> --- arch/arm64/include/asm/boot.h | 1 + arch/arm64/include/asm/kernel-pgtable.h | 7 +++++-- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/boot.h b/arch/arm64/include/asm/boot.h index 81151b6..678b63e 100644 --- a/arch/arm64/include/asm/boot.h +++ b/arch/arm64/include/asm/boot.h @@ -2,6 +2,7 @@ #ifndef __ASM_BOOT_H #define __ASM_BOOT_H +#include <asm/page.h> #include <asm/sizes.h> /* diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h index 5876a36..def7168 100644 --- a/arch/arm64/include/asm/kernel-pgtable.h +++ b/arch/arm64/include/asm/kernel-pgtable.h @@ -33,16 +33,19 @@ * 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 -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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