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Groups > linux.kernel > #1219068
| From | Catalin Marinas <catalin.marinas@arm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 12/14] arm64: Check for selected granule support |
| Date | 2015-09-04 16:00 +0200 |
| Message-ID | <q4ZH6-3Ud-67@gated-at.bofh.it> (permalink) |
| References | (2 earlier) <pWZNU-3cO-13@gated-at.bofh.it> <pX1Zo-6gD-29@gated-at.bofh.it> <pX4DU-1Gi-3@gated-at.bofh.it> <q4cQ2-1iy-13@gated-at.bofh.it> <q4dj3-25N-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Sep 02, 2015 at 12:19:07PM +0200, Ard Biesheuvel wrote: > On 2 September 2015 at 11:48, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote: > > Couldn't we allocate some flag bits in the Image header to communicate > > the page size to the bootloader? > > Something like this perhaps? > > ------------8<--------------- > diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt > index 7d9d3c2286b2..13a8aaa9a6e9 100644 > --- a/Documentation/arm64/booting.txt > +++ b/Documentation/arm64/booting.txt > @@ -104,7 +104,8 @@ 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. > + Bits 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 8fae0756e175..5def289bda84 100644 > --- a/arch/arm64/kernel/image.h > +++ b/arch/arm64/kernel/image.h > @@ -47,7 +47,9 @@ > #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) I'm fine with this. -- Catalin -- 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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Re: [PATCH 12/14] arm64: Check for selected granule support Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-09-02 11:50 +0200
Re: [PATCH 12/14] arm64: Check for selected granule support Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-09-02 12:20 +0200
Re: [PATCH 12/14] arm64: Check for selected granule support Catalin Marinas <catalin.marinas@arm.com> - 2015-09-04 16:00 +0200
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