mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 10:46:53 +07:00
af170c5061
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
45 lines
873 B
C
45 lines
873 B
C
#ifndef _ASM_X86_VSYSCALL_H
|
|
#define _ASM_X86_VSYSCALL_H
|
|
|
|
#include <linux/seqlock.h>
|
|
#include <uapi/asm/vsyscall.h>
|
|
|
|
#define VGETCPU_RDTSCP 1
|
|
#define VGETCPU_LSL 2
|
|
|
|
/* kernel space (writeable) */
|
|
extern int vgetcpu_mode;
|
|
extern struct timezone sys_tz;
|
|
|
|
#include <asm/vvar.h>
|
|
|
|
extern void map_vsyscall(void);
|
|
|
|
/*
|
|
* Called on instruction fetch fault in vsyscall page.
|
|
* Returns true if handled.
|
|
*/
|
|
extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address);
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
#define VGETCPU_CPU_MASK 0xfff
|
|
|
|
static inline unsigned int __getcpu(void)
|
|
{
|
|
unsigned int p;
|
|
|
|
if (VVAR(vgetcpu_mode) == VGETCPU_RDTSCP) {
|
|
/* Load per CPU data from RDTSCP */
|
|
native_read_tscp(&p);
|
|
} else {
|
|
/* Load per CPU data from GDT */
|
|
asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
|
|
}
|
|
|
|
return p;
|
|
}
|
|
#endif /* CONFIG_X86_64 */
|
|
|
|
#endif /* _ASM_X86_VSYSCALL_H */
|