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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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65cef1311d
Add a cmdline param which disables the microcode loader. This is useful mostly in debugging situations where we want to turn off microcode loading, both early from the initrd and late, as a means to be able to rule out its influence on the machine. Signed-off-by: Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/1400525957-11525-3-git-send-email-bp@alien8.de Signed-off-by: H. Peter Anvin <hpa@zytor.com>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
#ifndef _ASM_X86_MICROCODE_H
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#define _ASM_X86_MICROCODE_H
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#define native_rdmsr(msr, val1, val2) \
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do { \
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u64 __val = native_read_msr((msr)); \
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(void)((val1) = (u32)__val); \
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(void)((val2) = (u32)(__val >> 32)); \
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} while (0)
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#define native_wrmsr(msr, low, high) \
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native_write_msr(msr, low, high)
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#define native_wrmsrl(msr, val) \
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native_write_msr((msr), \
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(u32)((u64)(val)), \
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(u32)((u64)(val) >> 32))
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struct cpu_signature {
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unsigned int sig;
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unsigned int pf;
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unsigned int rev;
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};
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struct device;
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enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };
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extern bool dis_ucode_ldr;
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struct microcode_ops {
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enum ucode_state (*request_microcode_user) (int cpu,
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const void __user *buf, size_t size);
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enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
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bool refresh_fw);
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void (*microcode_fini_cpu) (int cpu);
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/*
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* The generic 'microcode_core' part guarantees that
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* the callbacks below run on a target cpu when they
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* are being called.
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* See also the "Synchronization" section in microcode_core.c.
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*/
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int (*apply_microcode) (int cpu);
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int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
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};
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struct ucode_cpu_info {
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struct cpu_signature cpu_sig;
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int valid;
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void *mc;
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};
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extern struct ucode_cpu_info ucode_cpu_info[];
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#ifdef CONFIG_MICROCODE_INTEL
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extern struct microcode_ops * __init init_intel_microcode(void);
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#else
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static inline struct microcode_ops * __init init_intel_microcode(void)
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{
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return NULL;
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}
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#endif /* CONFIG_MICROCODE_INTEL */
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#ifdef CONFIG_MICROCODE_AMD
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extern struct microcode_ops * __init init_amd_microcode(void);
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extern void __exit exit_amd_microcode(void);
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#else
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static inline struct microcode_ops * __init init_amd_microcode(void)
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{
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return NULL;
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}
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static inline void __exit exit_amd_microcode(void) {}
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#endif
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#ifdef CONFIG_MICROCODE_EARLY
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#define MAX_UCODE_COUNT 128
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extern void __init load_ucode_bsp(void);
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extern void load_ucode_ap(void);
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extern int __init save_microcode_in_initrd(void);
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#else
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static inline void __init load_ucode_bsp(void) {}
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static inline void load_ucode_ap(void) {}
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static inline int __init save_microcode_in_initrd(void)
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{
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return 0;
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}
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#endif
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#endif /* _ASM_X86_MICROCODE_H */
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