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[PATCH] x86-64: Remove duplicated code for reading control registers 

On Tue, Mar 13, 2007 at 05:33:09AM -0700, Randy.Dunlap wrote:
> On Tue, 13 Mar 2007, Glauber de Oliveira Costa wrote:
>
> > Tiny cleanup:
> >
> > In x86_64, the same functions for reading cr3 and writing cr{3,4} are
> > defined in tlbflush.h and system.h, whith just a name change.
> > The only difference is the clobbering of memory, which seems a safe, and
> > even needed change for the write_cr4. This patch removes the duplicate.
> > write_cr3() is moved to system.h for consistency.
>
> missing patch.....
>
thanks. Attached now

--
Glauber de Oliveira Costa
Red Hat Inc.
"Free as in Freedom"

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Glauber de Oliveira Costa 2007-05-02 19:27:06 +02:00 committed by Andi Kleen
parent f9d09645d6
commit fbc16f2c2a
2 changed files with 11 additions and 29 deletions
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7
include/asm-x86_64/system.h
View File

@ -89,6 +89,11 @@ static inline unsigned long read_cr3(void)
return cr3; return cr3;
} }
static inline void write_cr3(unsigned long val)
{
asm volatile("movq %0,%%cr3" :: "r" (val) : "memory");
}
static inline unsigned long read_cr4(void) static inline unsigned long read_cr4(void)
{ {
unsigned long cr4; unsigned long cr4;
@ -98,7 +103,7 @@ static inline unsigned long read_cr4(void)
static inline void write_cr4(unsigned long val) static inline void write_cr4(unsigned long val)
{ {
asm volatile("movq %0,%%cr4" :: "r" (val)); asm volatile("movq %0,%%cr4" :: "r" (val) : "memory");
} }
#define stts() write_cr0(8 | read_cr0()) #define stts() write_cr0(8 | read_cr0())

33
include/asm-x86_64/tlbflush.h
View File

@ -3,41 +3,18 @@
#include <linux/mm.h> #include <linux/mm.h>
#include <asm/processor.h> #include <asm/processor.h>
#include <asm/system.h>
static inline unsigned long get_cr3(void)
{
unsigned long cr3;
asm volatile("mov %%cr3,%0" : "=r" (cr3));
return cr3;
}
static inline void set_cr3(unsigned long cr3)
{
asm volatile("mov %0,%%cr3" :: "r" (cr3) : "memory");
}
static inline void __flush_tlb(void) static inline void __flush_tlb(void)
{ {
set_cr3(get_cr3()); write_cr3(read_cr3());
}
static inline unsigned long get_cr4(void)
{
unsigned long cr4;
asm volatile("mov %%cr4,%0" : "=r" (cr4));
return cr4;
}
static inline void set_cr4(unsigned long cr4)
{
asm volatile("mov %0,%%cr4" :: "r" (cr4) : "memory");
} }
static inline void __flush_tlb_all(void) static inline void __flush_tlb_all(void)
{ {
unsigned long cr4 = get_cr4(); unsigned long cr4 = read_cr4();
set_cr4(cr4 & ~X86_CR4_PGE); /* clear PGE */ write_cr4(cr4 & ~X86_CR4_PGE); /* clear PGE */
set_cr4(cr4); /* write old PGE again and flush TLBs */ write_cr4(cr4); /* write old PGE again and flush TLBs */
} }
#define __flush_tlb_one(addr) \ #define __flush_tlb_one(addr) \