/* * Apple Onboard Audio driver for Onyx codec (header) * * Copyright 2006 Johannes Berg * * GPL v2, can be found in COPYING. */ #ifndef __SND_AOA_CODEC_ONYX_H #define __SND_AOA_CODEC_ONYX_H #include #include #include #include /* PCM3052 register definitions */ /* the attenuation registers take values from * -1 (0dB) to -127 (-63.0 dB) or others (muted) */ #define ONYX_REG_DAC_ATTEN_LEFT 65 #define FIRSTREGISTER ONYX_REG_DAC_ATTEN_LEFT #define ONYX_REG_DAC_ATTEN_RIGHT 66 #define ONYX_REG_CONTROL 67 # define ONYX_MRST (1<<7) # define ONYX_SRST (1<<6) # define ONYX_ADPSV (1<<5) # define ONYX_DAPSV (1<<4) # define ONYX_SILICONVERSION (1<<0) /* all others reserved */ #define ONYX_REG_DAC_CONTROL 68 # define ONYX_OVR1 (1<<6) # define ONYX_MUTE_RIGHT (1<<1) # define ONYX_MUTE_LEFT (1<<0) #define ONYX_REG_DAC_DEEMPH 69 # define ONYX_DIGDEEMPH_SHIFT 5 # define ONYX_DIGDEEMPH_MASK (3<commitdiff
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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /kernel/freezer.c
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/freezer.c')