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Groups > linux.kernel > #1246545
| From | "Suzuki K. Poulose" <suzuki.poulose@arm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCHv3 09/11] arm64: Add page size to the kernel image header |
| Date | 2015-10-14 13:30 +0200 |
| Message-ID | <qjspR-5qz-35@gated-at.bofh.it> (permalink) |
| References | <qjspQ-5qz-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Ard Biesheuvel <ard.biesheuvel@linaro.org> This patch adds the page size to the arm64 kernel image header so that one can infer the PAGESIZE used by the kernel. This will be helpful to diagnose failures to boot the kernel with page size not supported by the CPU. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> --- Documentation/arm64/booting.txt | 7 ++++++- arch/arm64/kernel/image.h | 5 ++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt index 7d9d3c2..aaf6d77 100644 --- a/Documentation/arm64/booting.txt +++ b/Documentation/arm64/booting.txt @@ -104,7 +104,12 @@ Header notes: - The flags field (introduced in v3.17) is a little-endian 64-bit field composed as follows: Bit 0: Kernel endianness. 1 if BE, 0 if LE. - Bits 1-63: Reserved. + Bit 1-2: Kernel Page size. + 0 - Unspecified. + 1 - 4K + 2 - 16K + 3 - 64K + Bits 3-63: Reserved. - When image_size is zero, a bootloader should attempt to keep as much memory as possible free for use by the kernel immediately after the diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h index 6eb8fee..e45759e 100644 --- a/arch/arm64/kernel/image.h +++ b/arch/arm64/kernel/image.h @@ -47,7 +47,10 @@ #define __HEAD_FLAG_BE 0 #endif -#define __HEAD_FLAGS (__HEAD_FLAG_BE << 0) +#define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2) + +#define __HEAD_FLAGS (__HEAD_FLAG_BE << 0) | \ + (__HEAD_FLAG_PAGE_SIZE << 1) /* * These will output as part of the Image header, which should be little-endian -- 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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[PATCHv3 09/11] arm64: Add page size to the kernel image header "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-10-14 13:30 +0200
Re: [PATCHv3 09/11] arm64: Add page size to the kernel image header Mark Rutland <mark.rutland@arm.com> - 2015-10-14 19:30 +0200
Re: [PATCHv3 09/11] arm64: Add page size to the kernel image header "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-10-15 11:20 +0200
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