From 6bc1096d7ab3621b3ffcf06616d1f4e0325d903d Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Fri, 22 May 2009 12:12:01 +0200 Subject: x86: MSR: add a struct representation of an MSR Add a struct representing a 64bit MSR pair consisting of a low and high register part and convert msr_info to use it. Also, rename msr-on-cpu.c to msr.c. Side note: Put the cpumask.h include in __KERNEL__ space thus fixing an allmodconfig build failure in the headers_check target. CC: H. Peter Anvin Signed-off-by: Borislav Petkov diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h index 638bf62..5e12132 100644 --- a/arch/x86/include/asm/msr.h +++ b/arch/x86/include/asm/msr.h @@ -12,6 +12,17 @@ #include #include +#include + +struct msr { + union { + struct { + u32 l; + u32 h; + }; + u64 q; + }; +}; static inline unsigned long long native_read_tscp(unsigned int *aux) { diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile index 55e11aa..f9d3563 100644 --- a/arch/x86/lib/Makefile +++ b/arch/x86/lib/Makefile @@ -2,7 +2,7 @@ # Makefile for x86 specific library files. # -obj-$(CONFIG_SMP) := msr-on-cpu.o +obj-$(CONFIG_SMP) := msr.o lib-y := delay.o lib-y += thunk_$(BITS).o diff --git a/arch/x86/lib/msr-on-cpu.c b/arch/x86/lib/msr-on-cpu.c deleted file mode 100644 index 321cf72..0000000 --- a/arch/x86/lib/msr-on-cpu.c +++ /dev/null @@ -1,97 +0,0 @@ -#include -#include -#include -#include - -struct msr_info { - u32 msr_no; - u32 l, h; - int err; -}; - -static void __rdmsr_on_cpu(void *info) -{ - struct msr_info *rv = info; - - rdmsr(rv->msr_no, rv->l, rv->h); -} - -static void __wrmsr_on_cpu(void *info) -{ - struct msr_info *rv = info; - - wrmsr(rv->msr_no, rv->l, rv->h); -} - -int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) -{ - int err; - struct msr_info rv; - - rv.msr_no = msr_no; - err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1); - *l = rv.l; - *h = rv.h; - - return err; -} - -int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) -{ - int err; - struct msr_info rv; - - rv.msr_no = msr_no; - rv.l = l; - rv.h = h; - err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1); - - return err; -} - -/* These "safe" variants are slower and should be used when the target MSR - may not actually exist. */ -static void __rdmsr_safe_on_cpu(void *info) -{ - struct msr_info *rv = info; - - rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h); -} - -static void __wrmsr_safe_on_cpu(void *info) -{ - struct msr_info *rv = info; - - rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h); -} - -int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) -{ - int err; - struct msr_info rv; - - rv.msr_no = msr_no; - err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1); - *l = rv.l; - *h = rv.h; - - return err ? err : rv.err; -} - -int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) -{ - int err; - struct msr_info rv; - - rv.msr_no = msr_no; - rv.l = l; - rv.h = h; - err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1); - - return err ? err : rv.err; -} - -EXPORT_SYMBOL(rdmsr_on_cpu); -EXPORT_SYMBOL(wrmsr_on_cpu); -EXPORT_SYMBOL(rdmsr_safe_on_cpu); -EXPORT_SYMBOL(wrmsr_safe_on_cpu); diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c new file mode 100644 index 0000000..cade714 --- /dev/null +++ b/arch/x86/lib/msr.c @@ -0,0 +1,97 @@ +#include +#include +#include +#include + +struct msr_info { + u32 msr_no; + struct msr reg; + int err; +}; + +static void __rdmsr_on_cpu(void *info) +{ + struct msr_info *rv = info; + + rdmsr(rv->msr_no, rv->reg.l, rv->reg.h); +} + +static void __wrmsr_on_cpu(void *info) +{ + struct msr_info *rv = info; + + wrmsr(rv->msr_no, rv->reg.l, rv->reg.h); +} + +int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) +{ + int err; + struct msr_info rv; + + rv.msr_no = msr_no; + err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1); + *l = rv.reg.l; + *h = rv.reg.h; + + return err; +} + +int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) +{ + int err; + struct msr_info rv; + + rv.msr_no = msr_no; + rv.reg.l = l; + rv.reg.h = h; + err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1); + + return err; +} + +/* These "safe" variants are slower and should be used when the target MSR + may not actually exist. */ +static void __rdmsr_safe_on_cpu(void *info) +{ + struct msr_info *rv = info; + + rv->err = rdmsr_safe(rv->msr_no, &rv->reg.l, &rv->reg.h); +} + +static void __wrmsr_safe_on_cpu(void *info) +{ + struct msr_info *rv = info; + + rv->err = wrmsr_safe(rv->msr_no, rv->reg.l, rv->reg.h); +} + +int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) +{ + int err; + struct msr_info rv; + + rv.msr_no = msr_no; + err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1); + *l = rv.reg.l; + *h = rv.reg.h; + + return err ? err : rv.err; +} + +int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) +{ + int err; + struct msr_info rv; + + rv.msr_no = msr_no; + rv.reg.l = l; + rv.reg.h = h; + err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1); + + return err ? err : rv.err; +} + +EXPORT_SYMBOL(rdmsr_on_cpu); +EXPORT_SYMBOL(wrmsr_on_cpu); +EXPORT_SYMBOL(rdmsr_safe_on_cpu); +EXPORT_SYMBOL(wrmsr_safe_on_cpu); -- cgit v0.10.2