Commit fbc16f2c authored by Glauber de Oliveira Costa's avatar Glauber de Oliveira Costa Committed by Andi Kleen

[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: default avatarAndi Kleen <ak@suse.de>
parent f9d09645
......@@ -89,6 +89,11 @@ static inline unsigned long read_cr3(void)
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)
{
unsigned long cr4;
......@@ -98,7 +103,7 @@ static inline unsigned long read_cr4(void)
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())
......
......@@ -3,41 +3,18 @@
#include <linux/mm.h>
#include <asm/processor.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");
}
#include <asm/system.h>
static inline void __flush_tlb(void)
{
set_cr3(get_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");
write_cr3(read_cr3());
}
static inline void __flush_tlb_all(void)
{
unsigned long cr4 = get_cr4();
set_cr4(cr4 & ~X86_CR4_PGE); /* clear PGE */
set_cr4(cr4); /* write old PGE again and flush TLBs */
unsigned long cr4 = read_cr4();
write_cr4(cr4 & ~X86_CR4_PGE); /* clear PGE */
write_cr4(cr4); /* write old PGE again and flush TLBs */
}
#define __flush_tlb_one(addr) \
......
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