forked from luck/tmp_suning_uos_patched
2aae950b21
This implements new vDSO for x86-64. The concept is similar to the existing vDSOs on i386 and PPC. x86-64 has had static vsyscalls before, but these are not flexible enough anymore. A vDSO is a ELF shared library supplied by the kernel that is mapped into user address space. The vDSO mapping is randomized for each process for security reasons. Doing this was needed for clock_gettime, because clock_gettime always needs a syscall fallback and having one at a fixed address would have made buffer overflow exploits too easy to write. The vdso can be disabled with vdso=0 It currently includes a new gettimeofday implemention and optimized clock_gettime(). The gettimeofday implementation is slightly faster than the one in the old vsyscall. clock_gettime is significantly faster than the syscall for CLOCK_MONOTONIC and CLOCK_REALTIME. The new calls are generally faster than the old vsyscall. Advantages over the old x86-64 vsyscalls: - Extensible - Randomized - Cleaner - Easier to virtualize (the old static address range previously causes overhead e.g. for Xen because it has to create special page tables for it) Weak points: - glibc support still to be written The VM interface is partly based on Ingo Molnar's i386 version. Includes compile fix from Joachim Deguara Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
30 lines
610 B
C
30 lines
610 B
C
#ifndef _ASM_VGTOD_H
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#define _ASM_VGTOD_H 1
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#include <asm/vsyscall.h>
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#include <linux/clocksource.h>
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struct vsyscall_gtod_data {
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seqlock_t lock;
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/* open coded 'struct timespec' */
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time_t wall_time_sec;
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u32 wall_time_nsec;
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int sysctl_enabled;
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struct timezone sys_tz;
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struct { /* extract of a clocksource struct */
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cycle_t (*vread)(void);
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cycle_t cycle_last;
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cycle_t mask;
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u32 mult;
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u32 shift;
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} clock;
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struct timespec wall_to_monotonic;
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};
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extern struct vsyscall_gtod_data __vsyscall_gtod_data
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__section_vsyscall_gtod_data;
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extern struct vsyscall_gtod_data vsyscall_gtod_data;
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#endif
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