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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5afaa1fc1b
The ARM erratum 832075 applies to certain revisions of Cortex-A57, one of the workarounds is to change device loads into using load-aquire semantics. This is achieved using the alternatives framework. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
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* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_CPUFEATURE_H
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#define __ASM_CPUFEATURE_H
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#include <asm/hwcap.h>
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/*
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* In the arm64 world (as in the ARM world), elf_hwcap is used both internally
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* in the kernel and for user space to keep track of which optional features
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* are supported by the current system. So let's map feature 'x' to HWCAP_x.
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* Note that HWCAP_x constants are bit fields so we need to take the log.
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*/
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#define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap))
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#define cpu_feature(x) ilog2(HWCAP_ ## x)
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#define ARM64_WORKAROUND_CLEAN_CACHE 0
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#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1
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#define NCAPS 2
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#ifndef __ASSEMBLY__
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extern DECLARE_BITMAP(cpu_hwcaps, NCAPS);
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static inline bool cpu_have_feature(unsigned int num)
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{
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return elf_hwcap & (1UL << num);
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}
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static inline bool cpus_have_cap(unsigned int num)
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{
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if (num >= NCAPS)
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return false;
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return test_bit(num, cpu_hwcaps);
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}
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static inline void cpus_set_cap(unsigned int num)
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{
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if (num >= NCAPS)
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pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n",
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num, NCAPS);
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else
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__set_bit(num, cpu_hwcaps);
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}
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void check_local_cpu_errata(void);
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#endif /* __ASSEMBLY__ */
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#endif
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