; Author: Frederik Noring ; ; This file is subject to the terms and conditions of the GNU General Public ; License. See the file COPYING in the main directory of this archive ; for more details. ; DSP56k loader ; Host Interface M_BCR EQU $FFFE ; Port A Bus Control Register M_PBC EQU $FFE0 ; Port B Control Register M_PBDDR EQU $FFE2 ; Port B Data Direction Register M_PBD EQU $FFE4 ; Port B Data Register M_PCC EQU $FFE1 ; Port C Control Register M_PCDDR EQU $FFE3 ; Port C Data Direction Register M_PCD EQU $FFE5 ; Port C Data Register M_HCR EQU $FFE8 ; Host Control Register M_HSR EQU $FFE9 ; Host Status Register M_HRX EQU $FFEB ; Host Receive Data Register M_HTX EQU $FFEB ; Host Transmit Data Register ; SSI, Synchronous Serial Interface M_RX EQU $FFEF ; Serial Receive Data Register M_TX EQU $FFEF ; Serial Transmit Data Register M_CRA EQU $FFEC ; SSI Control Register A M_CRB EQU $FFED ; SSI Control Register B M_SR EQU $FFEE ; SSI Status Register M_TSR EQU $FFEE ; SSI Time Slot Register ; Exception Processing M_IPR EQU $FFFF ; Interrupt Priority Register org P:$0 start jmp <$40 org P:$40 ; ; Zero 16384 DSP X and Y words ; clr A #0,r0 ; clr B #0,r4 ; do #64,<_block1 ; rep #256 ; move A,X:(r0)+ B,Y:(r4)+ ;_block1 ; Zero (32768-512) Program words ; clr A #512,r0 ; do #126,<_block2 ; rep #256 ; move A,P:(r0)+ ;_block2 ; Copy DSP program control move #real,r0 move #upload,r1 do #upload_end-upload,_copy movem P:(r0)+,x0 movem x0,P:(r1)+ _copy movep #4,X:<3,x0 cmp x0,A #>1,x0 jeq <$0 _get_address jclr #0,X:<2,x0 jeq load_X cmp x0,A jeq load_Y load_P do y0,_load_P jclr #0,X:<ieee802154/6lowpan/Kconfig
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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 /net/ieee802154/6lowpan/Kconfig
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 'net/ieee802154/6lowpan/Kconfig')