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x86: provide read and write cr8 paravirt hooks

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Since the cr8 manipulation functions ended up staying in the tree,
they can't be defined just when PARAVIRT is off: In this patch,
those functions are defined for the PARAVIRT case too.

[ mingo@elte.hu: fixes ]

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber de Oliveira Costa 2008-01-30 13:33:19 +01:00 committed by Ingo Molnar
parent 4c9890c246
commit 94ea03cdda
2 changed files with 18 additions and 14 deletions
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2
include/asm-x86/paravirt.h
View File

@ -619,6 +619,7 @@ static inline void write_cr4(unsigned long x)
PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
}
#ifdef CONFIG_X86_64
static inline unsigned long read_cr8(void)
{
return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
@ -628,6 +629,7 @@ static inline void write_cr8(unsigned long x)
{
PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
}
#endif
static inline void raw_safe_halt(void)
{

30
include/asm-x86/system.h
View File

@ -231,6 +231,20 @@ static inline void native_write_cr4(unsigned long val)
asm volatile("mov %0,%%cr4": :"r" (val), "m" (__force_order));
}
#ifdef CONFIG_X86_64
static inline unsigned long native_read_cr8(void)
{
unsigned long cr8;
asm volatile("movq %%cr8,%0" : "=r" (cr8));
return cr8;
}
static inline void native_write_cr8(unsigned long val)
{
asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
}
#endif
static inline void native_wbinvd(void)
{
asm volatile("wbinvd": : :"memory");
@ -248,21 +262,9 @@ static inline void native_wbinvd(void)
#define read_cr4_safe() (native_read_cr4_safe())
#define write_cr4(x) (native_write_cr4(x))
#define wbinvd() (native_wbinvd())
#ifdef CONFIG_X86_64
static inline unsigned long read_cr8(void)
{
unsigned long cr8;
asm volatile("movq %%cr8,%0" : "=r" (cr8));
return cr8;
}
static inline void write_cr8(unsigned long val)
{
asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
}
#define read_cr8() (native_read_cr8())
#define write_cr8(x) (native_write_cr8(x))
#endif
/* Clear the 'TS' bit */