diff options
| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2019-06-21 12:52:50 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-06-22 22:21:10 +0300 |
| commit | f66501dc53e72079045a6a17e023b41316ede220 (patch) | |
| tree | 07dc2d3fe4042688596f1887af11db28e20876c8 /arch/x86/include/asm/vdso | |
| parent | 7ac8707479886c75f353bfb6a8273f423cfccb23 (diff) | |
| download | linux-f66501dc53e72079045a6a17e023b41316ede220.tar.xz | |
x86/vdso: Add clock_getres() entry point
The generic vDSO library provides an implementation of clock_getres()
that can be leveraged by each architecture.
Add the clock_getres() VDSO entry point on x86.
[ tglx: Massaged changelog and cleaned up the function signature formatting ]
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Mark Salyzyn <salyzyn@android.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Huw Davies <huw@codeweavers.com>
Cc: Shijith Thotton <sthotton@marvell.com>
Cc: Andre Przywara <andre.przywara@arm.com>
Link: https://lkml.kernel.org/r/20190621095252.32307-24-vincenzo.frascino@arm.com
Diffstat (limited to 'arch/x86/include/asm/vdso')
| -rw-r--r-- | arch/x86/include/asm/vdso/gettimeofday.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/x86/include/asm/vdso/gettimeofday.h b/arch/x86/include/asm/vdso/gettimeofday.h index 0e2650fc191b..f92752d6cbcf 100644 --- a/arch/x86/include/asm/vdso/gettimeofday.h +++ b/arch/x86/include/asm/vdso/gettimeofday.h @@ -24,6 +24,8 @@ #define VDSO_HAS_TIME 1 +#define VDSO_HAS_CLOCK_GETRES 1 + #ifdef CONFIG_PARAVIRT_CLOCK extern u8 pvclock_page[PAGE_SIZE] __attribute__((visibility("hidden"))); @@ -60,6 +62,18 @@ long gettimeofday_fallback(struct __kernel_old_timeval *_tv, return ret; } +static __always_inline +long clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) +{ + long ret; + + asm ("syscall" : "=a" (ret), "=m" (*_ts) : + "0" (__NR_clock_getres), "D" (_clkid), "S" (_ts) : + "rcx", "r11"); + + return ret; +} + #else static __always_inline @@ -97,6 +111,23 @@ long gettimeofday_fallback(struct __kernel_old_timeval *_tv, return ret; } +static __always_inline long +clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) +{ + long ret; + + asm ( + "mov %%ebx, %%edx \n" + "mov %[clock], %%ebx \n" + "call __kernel_vsyscall \n" + "mov %%edx, %%ebx \n" + : "=a" (ret), "=m" (*_ts) + : "0" (__NR_clock_getres_time64), [clock] "g" (_clkid), "c" (_ts) + : "edx"); + + return ret; +} + #endif #ifdef CONFIG_PARAVIRT_CLOCK |