linux/include/asm-x86_64/vsyscall.h
Eric Dumazet 5809f9d442 [PATCH] x86-64: get rid of ARCH_HAVE_XTIME_LOCK
ARCH_HAVE_XTIME_LOCK is used by x86_64 arch .  This arch needs to place a
read only copy of xtime_lock into vsyscall page.  This read only copy is
named __xtime_lock, and xtime_lock is defined in
arch/x86_64/kernel/vmlinux.lds.S as an alias.  So the declaration of
xtime_lock in kernel/timer.c was guarded by ARCH_HAVE_XTIME_LOCK define,
defined to true on x86_64.

We can get same result with _attribute__((weak)) in the declaration. linker
should do the job.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2007-02-13 13:26:21 +01:00

63 lines
1.9 KiB
C

#ifndef _ASM_X86_64_VSYSCALL_H_
#define _ASM_X86_64_VSYSCALL_H_
enum vsyscall_num {
__NR_vgettimeofday,
__NR_vtime,
__NR_vgetcpu,
};
#define VSYSCALL_START (-10UL << 20)
#define VSYSCALL_SIZE 1024
#define VSYSCALL_END (-2UL << 20)
#define VSYSCALL_MAPPED_PAGES 1
#define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr))
#ifdef __KERNEL__
#include <linux/seqlock.h>
#define __section_vxtime __attribute__ ((unused, __section__ (".vxtime"), aligned(16)))
#define __section_vgetcpu_mode __attribute__ ((unused, __section__ (".vgetcpu_mode"), aligned(16)))
#define __section_jiffies __attribute__ ((unused, __section__ (".jiffies"), aligned(16)))
#define __section_sys_tz __attribute__ ((unused, __section__ (".sys_tz"), aligned(16)))
#define __section_sysctl_vsyscall __attribute__ ((unused, __section__ (".sysctl_vsyscall"), aligned(16)))
#define __section_xtime __attribute__ ((unused, __section__ (".xtime"), aligned(16)))
#define __section_xtime_lock __attribute__ ((unused, __section__ (".xtime_lock"), aligned(16)))
#define VXTIME_TSC 1
#define VXTIME_HPET 2
#define VXTIME_PMTMR 3
#define VGETCPU_RDTSCP 1
#define VGETCPU_LSL 2
struct vxtime_data {
long hpet_address; /* HPET base address */
int last;
unsigned long last_tsc;
long quot;
long tsc_quot;
int mode;
};
#define hpet_readl(a) readl((const void __iomem *)fix_to_virt(FIX_HPET_BASE) + a)
#define hpet_writel(d,a) writel(d, (void __iomem *)fix_to_virt(FIX_HPET_BASE) + a)
/* vsyscall space (readonly) */
extern struct vxtime_data __vxtime;
extern int __vgetcpu_mode;
extern struct timespec __xtime;
extern volatile unsigned long __jiffies;
extern struct timezone __sys_tz;
extern seqlock_t __xtime_lock;
/* kernel space (writeable) */
extern struct vxtime_data vxtime;
extern int vgetcpu_mode;
extern struct timezone sys_tz;
extern int sysctl_vsyscall;
#endif /* __KERNEL__ */
#endif /* _ASM_X86_64_VSYSCALL_H_ */