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author | H. Peter Anvin <hpa@zytor.com> | 2009-08-31 14:13:48 -0700 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2009-08-31 16:15:57 -0700 |
commit | 8b956bf1f0f2b552ed93cf6cafe823edff298b3b (patch) | |
tree | 0a4dcb17d4107a606f3e549f52db492aaf7d1cd2 /arch/x86/lib | |
parent | 0cc0213e73af5963eca259c84876937c20689dbd (diff) | |
download | kernel_samsung_espresso10-8b956bf1f0f2b552ed93cf6cafe823edff298b3b.zip kernel_samsung_espresso10-8b956bf1f0f2b552ed93cf6cafe823edff298b3b.tar.gz kernel_samsung_espresso10-8b956bf1f0f2b552ed93cf6cafe823edff298b3b.tar.bz2 |
x86, msr: Create _on_cpu helpers for {rw,wr}msr_safe_regs()
Create _on_cpu helpers for {rw,wr}msr_safe_regs() analogously with the
other MSR functions. This will be necessary to add support for these
to the MSR driver.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Borislav Petkov <petkovbb@gmail.com>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r-- | arch/x86/lib/msr.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c index caa24ac..33a1e3c 100644 --- a/arch/x86/lib/msr.c +++ b/arch/x86/lib/msr.c @@ -175,3 +175,52 @@ int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) return err ? err : rv.err; } EXPORT_SYMBOL(wrmsr_safe_on_cpu); + +/* + * These variants are significantly slower, but allows control over + * the entire 32-bit GPR set. + */ +struct msr_regs_info { + u32 *regs; + int err; +}; + +static void __rdmsr_safe_regs_on_cpu(void *info) +{ + struct msr_regs_info *rv = info; + + rv->err = rdmsr_safe_regs(rv->regs); +} + +static void __wrmsr_safe_regs_on_cpu(void *info) +{ + struct msr_regs_info *rv = info; + + rv->err = wrmsr_safe_regs(rv->regs); +} + +int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs) +{ + int err; + struct msr_regs_info rv; + + rv.regs = regs; + rv.err = -EIO; + err = smp_call_function_single(cpu, __rdmsr_safe_regs_on_cpu, &rv, 1); + + return err ? err : rv.err; +} +EXPORT_SYMBOL(rdmsr_safe_regs_on_cpu); + +int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs) +{ + int err; + struct msr_regs_info rv; + + rv.regs = regs; + rv.err = -EIO; + err = smp_call_function_single(cpu, __wrmsr_safe_regs_on_cpu, &rv, 1); + + return err ? err : rv.err; +} +EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu); |