/* * POWER Data Stream Control Register (DSCR) * * This header file contains helper functions and macros * required for all the DSCR related test cases. * * Copyright 2012, Anton Blanchard, IBM Corporation. * Copyright 2015, Anshuman Khandual, IBM Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ #ifndef _SELFTESTS_POWERPC_DSCR_DSCR_H #define _SELFTESTS_POWERPC_DSCR_DSCR_H #include #include #include #include #include #include #include #include #include #include #include #include "utils.h" #define THREADS 100 /* Max threads */ #define COUNT 100 /* Max iterations */ #define DSCR_MAX 16 /* Max DSCR value */ #define LEN_MAX 100 /* Max name length */ #define DSCR_DEFAULT "/sys/devices/system/cpu/dscr_default" #define CPU_PATH "/sys/devices/system/cpu/" #define rmb() asm volatile("lwsync":::"memory") #define wmb() asm volatile("lwsync":::"memory") #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) /* Prilvilege state DSCR access */ inline unsigned long get_dscr(void) { unsigned long ret; asm volatile("mfspr %0,%1" : "=r" (ret) : "i" (SPRN_DSCR_PRIV)); return ret; } inline void set_dscr(unsigned long val) { asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR_PRIV)); } /* Problem state DSCR access */ inline unsigned long get_dscr_usr(void) { unsigned long ret; asm volatile("mfspr %0,%1" : "=r" (ret) : "i" (SPRN_DSCR)); return ret; } inline void set_dscr_usr(unsigned long val) { asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR)); } /* Default DSCR access */ unsigned long get_default_dscr(void) { int fd = -1, ret; char buf[16]; unsigned long val; if (fd == -1) { fd = open(DSCR_DEFAULT, O_RDONLY); if (fd == -1) { perror("open() failed"); exit(1); } } memset(buf, 0, sizeof(buf)); lseek(fd, 0, SEEK_SET); ret = read(fd, buf, sizeof(buf)); if (ret == -1) { perror("read() failed"); exit(1); } sscanf(buf, "%lx", &val); close(fd); return val; } void set_default_dscr(unsigned long val) { int fd = -1, ret; char buf[16]; if (fd == -1) { fd = open(DSCR_DEFAULT, O_RDWR); if (fd == -1) { perror("open() failed"); exit(1); } } sprintf(buf, "%lx\n", val); ret = write(fd, buf, strlen(buf)); if (ret == -1) { perror("write() failed"); exit(1); } close(fd); } double uniform_deviate(int seed) { return seed * (1.0 / (RAND_MAX + 1.0)); } #endif /* _SELFTESTS_POWERPC_DSCR_DSCR_H */ n>
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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 /sound/soc/codecs/wm9090.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 'sound/soc/codecs/wm9090.c')