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x86/vdso: Add clock_getres() entry point

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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
This commit is contained in:
Vincenzo Frascino
2019-06-21 10:52:50 +01:00
committed by Thomas Gleixner
parent 7ac8707479
commit f66501dc53
4 changed files with 51 additions and 0 deletions
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31
arch/x86/include/asm/vdso/gettimeofday.h
View File

@@ -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