msr.h

xen 3.2.2 源码

#ifndef __ASM_MSR_H
#define __ASM_MSR_H

#include "msr-index.h"

#ifndef __ASSEMBLY__

#include <xen/smp.h>
#include <xen/percpu.h>

#define rdmsr(msr,val1,val2) \
     __asm__ __volatile__("rdmsr" \
			  : "=a" (val1), "=d" (val2) \
			  : "c" (msr))

#define rdmsrl(msr,val) do { unsigned long a__,b__; \
       __asm__ __volatile__("rdmsr" \
			    : "=a" (a__), "=d" (b__) \
			    : "c" (msr)); \
       val = a__ | ((u64)b__<<32); \
} while(0);

#define wrmsr(msr,val1,val2) \
     __asm__ __volatile__("wrmsr" \
			  : /* no outputs */ \
			  : "c" (msr), "a" (val1), "d" (val2))

static inline void wrmsrl(unsigned int msr, __u64 val)
{
        __u32 lo, hi;
        lo = (__u32)val;
        hi = (__u32)(val >> 32);
        wrmsr(msr, lo, hi);
}

/* rdmsr with exception handling */
#define rdmsr_safe(msr,val1,val2) ({\
    int _rc; \
    __asm__ __volatile__( \
        "1: rdmsr\n2:\n" \
        ".section .fixup,\"ax\"\n" \
        "3: movl %5,%2\n; jmp 2b\n" \
        ".previous\n" \
        ".section __ex_table,\"a\"\n" \
        "   "__FIXUP_ALIGN"\n" \
        "   "__FIXUP_WORD" 1b,3b\n" \
        ".previous\n" \
        : "=a" (val1), "=d" (val2), "=&r" (_rc) \
        : "c" (msr), "2" (0), "i" (-EFAULT)); \
    _rc; })

/* wrmsr with exception handling */
#define wrmsr_safe(msr,val1,val2) ({\
    int _rc; \
    __asm__ __volatile__( \
        "1: wrmsr\n2:\n" \
        ".section .fixup,\"ax\"\n" \
        "3: movl %5,%0\n; jmp 2b\n" \
        ".previous\n" \
        ".section __ex_table,\"a\"\n" \
        "   "__FIXUP_ALIGN"\n" \
        "   "__FIXUP_WORD" 1b,3b\n" \
        ".previous\n" \
        : "=&r" (_rc) \
        : "c" (msr), "a" (val1), "d" (val2), "0" (0), "i" (-EFAULT)); \
    _rc; })

#define rdtsc(low,high) \
     __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))

#define rdtscl(low) \
     __asm__ __volatile__("rdtsc" : "=a" (low) : : "edx")

#if defined(__i386__)
#define rdtscll(val) \
     __asm__ __volatile__("rdtsc" : "=A" (val))
#elif defined(__x86_64__)
#define rdtscll(val) do { \
     unsigned int a,d; \
     asm volatile("rdtsc" : "=a" (a), "=d" (d)); \
     (val) = ((unsigned long)a) | (((unsigned long)d)<<32); \
} while(0)
#endif

#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)

#define rdpmc(counter,low,high) \
     __asm__ __volatile__("rdpmc" \
			  : "=a" (low), "=d" (high) \
			  : "c" (counter))


DECLARE_PER_CPU(u64, efer);

static inline u64 read_efer(void)
{
    return this_cpu(efer);
}

static inline void write_efer(u64 val)
{
    this_cpu(efer) = val;
    wrmsrl(MSR_EFER, val);
}

DECLARE_PER_CPU(u32, ler_msr);

static inline void ler_enable(void)
{
    u64 debugctl;
    
    if ( !this_cpu(ler_msr) )
        return;

    rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl);
    wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl | 1);
}

#endif /* !__ASSEMBLY__ */

#endif /* __ASM_MSR_H */