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| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2019-11-04 14:02:19 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2019-11-16 01:21:14 +0300 |
| commit | 052e76a31b4a64d7678e270d498e1bc36c342f88 (patch) | |
| tree | eca825a21cae047e5f49c7c80c13b0105908f5f7 /arch/arm | |
| parent | 20e2fc42312f960f497ac2d617e3742754e1fa5e (diff) | |
| download | linux-052e76a31b4a64d7678e270d498e1bc36c342f88.tar.xz | |
ARM: 8931/1: Add clock_getres entry point
The generic vDSO library provides an implementation of clock_getres() that
can be leveraged by each architecture.
Add clock_getres() entry point on arm to be on pair with arm64.
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/vdso/gettimeofday.h | 20 | ||||
| -rw-r--r-- | arch/arm/vdso/vdso.lds.S | 1 | ||||
| -rw-r--r-- | arch/arm/vdso/vgettimeofday.c | 6 |
3 files changed, 27 insertions, 0 deletions
diff --git a/arch/arm/include/asm/vdso/gettimeofday.h b/arch/arm/include/asm/vdso/gettimeofday.h index 30ce4e87dffc..5b879ae7afc1 100644 --- a/arch/arm/include/asm/vdso/gettimeofday.h +++ b/arch/arm/include/asm/vdso/gettimeofday.h @@ -12,6 +12,8 @@ #include <asm/unistd.h> #include <uapi/linux/time.h> +#define VDSO_HAS_CLOCK_GETRES 1 + extern struct vdso_data *__get_datapage(void); static __always_inline int gettimeofday_fallback( @@ -50,6 +52,24 @@ static __always_inline long clock_gettime_fallback( return ret; } +static __always_inline int clock_getres_fallback( + clockid_t _clkid, + struct __kernel_timespec *_ts) +{ + register struct __kernel_timespec *ts asm("r1") = _ts; + register clockid_t clkid asm("r0") = _clkid; + register long ret asm ("r0"); + register long nr asm("r7") = __NR_clock_getres_time64; + + asm volatile( + " swi #0\n" + : "=r" (ret) + : "r" (clkid), "r" (ts), "r" (nr) + : "memory"); + + return ret; +} + static __always_inline u64 __arch_get_hw_counter(int clock_mode) { #ifdef CONFIG_ARM_ARCH_TIMER diff --git a/arch/arm/vdso/vdso.lds.S b/arch/arm/vdso/vdso.lds.S index 73cf205b003e..38cb8b0aa3b9 100644 --- a/arch/arm/vdso/vdso.lds.S +++ b/arch/arm/vdso/vdso.lds.S @@ -71,6 +71,7 @@ VERSION global: __vdso_clock_gettime; __vdso_gettimeofday; + __vdso_clock_getres; local: *; }; } diff --git a/arch/arm/vdso/vgettimeofday.c b/arch/arm/vdso/vgettimeofday.c index e64deb75178e..f6da91f9ccc7 100644 --- a/arch/arm/vdso/vgettimeofday.c +++ b/arch/arm/vdso/vgettimeofday.c @@ -19,6 +19,12 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv, return __cvdso_gettimeofday(tv, tz); } +int __vdso_clock_getres(clockid_t clock_id, + struct old_timespec32 *res) +{ + return __cvdso_clock_getres_time32(clock_id, res); +} + /* Avoid unresolved references emitted by GCC */ void __aeabi_unwind_cpp_pr0(void) |