/* $Id: iga.h,v 1.2 1999/09/11 22:56:31 zaitcev Exp $ * iga1682.h: Sparc/PCI iga1682 driver constants etc. * * Copyleft 1998 V. Roganov and G. Raiko */ #ifndef _IGA1682_H #define _IGA1682_H 1 #define IGA_ATTR_CTL 0x3C0 #define IGA_IDX_VGA_OVERSCAN 0x11 #define DAC_W_INDEX 0x03C8 #define DAC_DATA 0x03C9 #define IGA_EXT_CNTRL 0x3CE #define IGA_IDX_EXT_BUS_CNTL 0x30 #define MEM_SIZE_ALIAS 0x3 #define MEM_SIZE_1M 0x0 #define MEM_SIZE_2M 0x1 #define MEM_SIZE_4M 0x2 #define MEM_SIZE_RESERVED 0x3 #define IGA_IDX_OVERSCAN_COLOR 0x58 #define IGA_IDX_EXT_MEM_2 0x72 #endif /* !(_IGA1682_H) */ t logo'/> index : net-next.git
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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 /tools/perf/trace
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>
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