8d4a430085
Move the scattered checks for PAT support to a single function. Its moved to addon_cpuid_features.c as this file is shared between 32 and 64 bit. Remove the manipulation of the PAT feature bit and just disable PAT in the PAT layer, based on the PAT bit provided by the CPU and the current CPU version/model white list. Change the boot CPU check so it works on Voyager somewhere in the future as well :) Also panic, when a secondary has PAT disabled but the primary one has alrady switched to PAT. We have no way to undo that. The white list is kept for now to ensure that we can rely on known to work CPU types and concentrate on the software induced problems instead of fighthing CPU erratas and subtle wreckage caused by not yet verified CPUs. Once the PAT code has stabilized enough, we can remove the white list and open the can of worms. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
24 lines
514 B
C
24 lines
514 B
C
|
|
#ifndef _ASM_PAT_H
|
|
#define _ASM_PAT_H 1
|
|
|
|
#include <linux/types.h>
|
|
|
|
#ifdef CONFIG_X86_PAT
|
|
extern int pat_wc_enabled;
|
|
extern void validate_pat_support(struct cpuinfo_x86 *c);
|
|
#else
|
|
static const int pat_wc_enabled = 0;
|
|
static inline void validate_pat_support(struct cpuinfo_x86 *c) { }
|
|
#endif
|
|
|
|
extern void pat_init(void);
|
|
|
|
extern int reserve_memtype(u64 start, u64 end,
|
|
unsigned long req_type, unsigned long *ret_type);
|
|
extern int free_memtype(u64 start, u64 end);
|
|
|
|
extern void pat_disable(char *reason);
|
|
|
|
#endif
|
|
|