c08c820508
This patch adds a vgetcpu vsyscall, which depending on the CPU RDTSCP capability uses either the RDTSCP or CPUID to obtain a CPU and node numbers and pass them to the program. AK: Lots of changes over Vojtech's original code: Better prototype for vgetcpu() It's better to pass the cpu / node numbers as separate arguments to avoid mistakes when going from SMP to NUMA. Also add a fast time stamp based cache using a user supplied argument to speed things more up. Use fast method from Chuck Ebbert to retrieve node/cpu from GDT limit instead of CPUID Made sure RDTSCP init is always executed after node is known. Drop printk Signed-off-by: Vojtech Pavlik <vojtech@suse.cz> Signed-off-by: Andi Kleen <ak@suse.de>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
#ifndef _ASM_X86_64_VSYSCALL_H_
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#define _ASM_X86_64_VSYSCALL_H_
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enum vsyscall_num {
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__NR_vgettimeofday,
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__NR_vtime,
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__NR_vgetcpu,
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};
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#define VSYSCALL_START (-10UL << 20)
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#define VSYSCALL_SIZE 1024
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#define VSYSCALL_END (-2UL << 20)
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#define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr))
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#ifdef __KERNEL__
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#include <linux/seqlock.h>
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#define __section_vxtime __attribute__ ((unused, __section__ (".vxtime"), aligned(16)))
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#define __section_vgetcpu_mode __attribute__ ((unused, __section__ (".vgetcpu_mode"), aligned(16)))
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#define __section_wall_jiffies __attribute__ ((unused, __section__ (".wall_jiffies"), aligned(16)))
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#define __section_jiffies __attribute__ ((unused, __section__ (".jiffies"), aligned(16)))
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#define __section_sys_tz __attribute__ ((unused, __section__ (".sys_tz"), aligned(16)))
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#define __section_sysctl_vsyscall __attribute__ ((unused, __section__ (".sysctl_vsyscall"), aligned(16)))
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#define __section_xtime __attribute__ ((unused, __section__ (".xtime"), aligned(16)))
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#define __section_xtime_lock __attribute__ ((unused, __section__ (".xtime_lock"), aligned(16)))
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#define VXTIME_TSC 1
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#define VXTIME_HPET 2
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#define VXTIME_PMTMR 3
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#define VGETCPU_RDTSCP 1
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#define VGETCPU_LSL 2
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struct vxtime_data {
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long hpet_address; /* HPET base address */
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int last;
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unsigned long last_tsc;
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long quot;
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long tsc_quot;
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int mode;
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};
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#define hpet_readl(a) readl((const void __iomem *)fix_to_virt(FIX_HPET_BASE) + a)
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#define hpet_writel(d,a) writel(d, (void __iomem *)fix_to_virt(FIX_HPET_BASE) + a)
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/* vsyscall space (readonly) */
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extern struct vxtime_data __vxtime;
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extern int __vgetcpu_mode;
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extern struct timespec __xtime;
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extern volatile unsigned long __jiffies;
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extern unsigned long __wall_jiffies;
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extern struct timezone __sys_tz;
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extern seqlock_t __xtime_lock;
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/* kernel space (writeable) */
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extern struct vxtime_data vxtime;
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extern int vgetcpu_mode;
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extern unsigned long wall_jiffies;
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extern struct timezone sys_tz;
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extern int sysctl_vsyscall;
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extern seqlock_t xtime_lock;
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extern int sysctl_vsyscall;
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extern void vsyscall_set_cpu(int cpu);
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#define ARCH_HAVE_XTIME_LOCK 1
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_64_VSYSCALL_H_ */
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