162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
#ifndef __ASM_MSR_H
|
|
#define __ASM_MSR_H
|
|
|
|
#include <asm/msr-index.h>
|
|
|
|
#ifdef __KERNEL__
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <asm/errno.h>
|
|
|
|
static inline unsigned long long native_read_msr(unsigned int msr)
|
|
{
|
|
unsigned long long val;
|
|
|
|
asm volatile("rdmsr" : "=A" (val) : "c" (msr));
|
|
return val;
|
|
}
|
|
|
|
static inline unsigned long long native_read_msr_safe(unsigned int msr,
|
|
int *err)
|
|
{
|
|
unsigned long long val;
|
|
|
|
asm volatile("2: rdmsr ; xorl %0,%0\n"
|
|
"1:\n\t"
|
|
".section .fixup,\"ax\"\n\t"
|
|
"3: movl %3,%0 ; jmp 1b\n\t"
|
|
".previous\n\t"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n\t"
|
|
" .long 2b,3b\n\t"
|
|
".previous"
|
|
: "=r" (*err), "=A" (val)
|
|
: "c" (msr), "i" (-EFAULT));
|
|
|
|
return val;
|
|
}
|
|
|
|
static inline void native_write_msr(unsigned int msr, unsigned long long val)
|
|
{
|
|
asm volatile("wrmsr" : : "c" (msr), "A"(val));
|
|
}
|
|
|
|
static inline int native_write_msr_safe(unsigned int msr,
|
|
unsigned long long val)
|
|
{
|
|
int err;
|
|
asm volatile("2: wrmsr ; xorl %0,%0\n"
|
|
"1:\n\t"
|
|
".section .fixup,\"ax\"\n\t"
|
|
"3: movl %4,%0 ; jmp 1b\n\t"
|
|
".previous\n\t"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n\t"
|
|
" .long 2b,3b\n\t"
|
|
".previous"
|
|
: "=a" (err)
|
|
: "c" (msr), "0" ((u32)val), "d" ((u32)(val>>32)),
|
|
"i" (-EFAULT));
|
|
return err;
|
|
}
|
|
|
|
static inline unsigned long long native_read_tsc(void)
|
|
{
|
|
unsigned long long val;
|
|
asm volatile("rdtsc" : "=A" (val));
|
|
return val;
|
|
}
|
|
|
|
static inline unsigned long long native_read_pmc(void)
|
|
{
|
|
unsigned long long val;
|
|
asm volatile("rdpmc" : "=A" (val));
|
|
return val;
|
|
}
|
|
|
|
#ifdef CONFIG_PARAVIRT
|
|
#include <asm/paravirt.h>
|
|
#else
|
|
#include <linux/errno.h>
|
|
/*
|
|
* Access to machine-specific registers (available on 586 and better only)
|
|
* Note: the rd* operations modify the parameters directly (without using
|
|
* pointer indirection), this allows gcc to optimize better
|
|
*/
|
|
|
|
#define rdmsr(msr,val1,val2) \
|
|
do { \
|
|
u64 __val = native_read_msr(msr); \
|
|
(val1) = (u32)__val; \
|
|
(val2) = (u32)(__val >> 32); \
|
|
} while(0)
|
|
|
|
static inline void wrmsr(u32 __msr, u32 __low, u32 __high)
|
|
{
|
|
native_write_msr(__msr, ((u64)__high << 32) | __low);
|
|
}
|
|
|
|
#define rdmsrl(msr,val) \
|
|
((val) = native_read_msr(msr))
|
|
|
|
#define wrmsrl(msr,val) native_write_msr(msr, val)
|
|
|
|
/* wrmsr with exception handling */
|
|
static inline int wrmsr_safe(u32 __msr, u32 __low, u32 __high)
|
|
{
|
|
return native_write_msr_safe(__msr, ((u64)__high << 32) | __low);
|
|
}
|
|
|
|
/* rdmsr with exception handling */
|
|
#define rdmsr_safe(msr,p1,p2) \
|
|
({ \
|
|
int __err; \
|
|
u64 __val = native_read_msr_safe(msr, &__err); \
|
|
(*p1) = (u32)__val; \
|
|
(*p2) = (u32)(__val >> 32); \
|
|
__err; \
|
|
})
|
|
|
|
#define rdtscl(low) \
|
|
((low) = (u32)native_read_tsc())
|
|
|
|
#define rdtscll(val) \
|
|
((val) = native_read_tsc())
|
|
|
|
#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
|
|
|
|
#define rdpmc(counter,low,high) \
|
|
do { \
|
|
u64 _l = native_read_pmc(); \
|
|
(low) = (u32)_l; \
|
|
(high) = (u32)(_l >> 32); \
|
|
} while(0)
|
|
#endif /* !CONFIG_PARAVIRT */
|
|
|
|
#ifdef CONFIG_SMP
|
|
void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
|
|
void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
|
|
int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
|
|
int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
|
|
#else /* CONFIG_SMP */
|
|
static inline void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
|
|
{
|
|
rdmsr(msr_no, *l, *h);
|
|
}
|
|
static inline void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
|
|
{
|
|
wrmsr(msr_no, l, h);
|
|
}
|
|
static inline int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
|
|
{
|
|
return rdmsr_safe(msr_no, l, h);
|
|
}
|
|
static inline int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
|
|
{
|
|
return wrmsr_safe(msr_no, l, h);
|
|
}
|
|
#endif /* CONFIG_SMP */
|
|
#endif
|
|
#endif
|
|
#endif /* __ASM_MSR_H */
|