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Date: Mon, 11 Jan 2016 14:26:28 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
kernel-hardening@...ts.openwall.com, Will Deacon <will.deacon@....com>,
Catalin Marinas <catalin.marinas@....com>, Mark Rutland <mark.rutland@....com>,
Leif Lindholm <leif.lindholm@...aro.org>, Kees Cook <keescook@...omium.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc: Stuart Yoder <stuart.yoder@...escale.com>,
Sharma Bhupesh <bhupesh.sharma@...escale.com>, Arnd Bergmann <arnd@...db.de>,
Marc Zyngier <marc.zyngier@....com>, Christoffer Dall <christoffer.dall@...aro.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH v3 14/21] arm64: [re]define SWAPPER_TABLE_[SHIFT|SIZE] for
use in asm code
Please disregard this patch, I accidentally sent out two versions of
14/21, and this is the wrong one.
On 11 January 2016 at 14:19, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> The current definition of SWAPPER_TABLE_SHIFT can only be used in
> asm code if the configured number of translation levels defines
> PUD_SHIFT and/or PMD_SHIFT natively (4KB and 16KB/64KB granule,
> respectively). Otherwise, it depends on the nopmd/nopud fixup
> headers, which can only be included in C code.
>
> So redefine SWAPPER_TABLE_SHIFT in a way that is independent of the
> number of configured translation levels. Define SWAPPER_TABLE_SIZE
> as well, we will need it later.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> ---
> arch/arm64/include/asm/kernel-pgtable.h | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h
> index daa8a7b9917a..eaac46097359 100644
> --- a/arch/arm64/include/asm/kernel-pgtable.h
> +++ b/arch/arm64/include/asm/kernel-pgtable.h
> @@ -57,13 +57,14 @@
> #if ARM64_SWAPPER_USES_SECTION_MAPS
> #define SWAPPER_BLOCK_SHIFT SECTION_SHIFT
> #define SWAPPER_BLOCK_SIZE SECTION_SIZE
> -#define SWAPPER_TABLE_SHIFT PUD_SHIFT
> #else
> #define SWAPPER_BLOCK_SHIFT PAGE_SHIFT
> #define SWAPPER_BLOCK_SIZE PAGE_SIZE
> -#define SWAPPER_TABLE_SHIFT PMD_SHIFT
> #endif
>
> +#define SWAPPER_TABLE_SHIFT (SWAPPER_BLOCK_SHIFT + PAGE_SHIFT - 3)
> +#define SWAPPER_TABLE_SIZE (1 << SWAPPER_TABLE_SHIFT)
> +
> /* The size of the initial kernel direct mapping */
> #define SWAPPER_INIT_MAP_SIZE (_AC(1, UL) << SWAPPER_TABLE_SHIFT)
>
> --
> 2.5.0
>
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