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mips: 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 clock_getres() entry point on mips.

Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
This commit is contained in:
Vincenzo Frascino
2019-06-21 10:52:47 +01:00
committed by Paul Burton
parent 24640f233b
commit abed3d826f
3 changed files with 39 additions and 0 deletions
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26
arch/mips/include/asm/vdso/gettimeofday.h
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@@ -22,6 +22,8 @@
#include <asm/unistd.h>
#include <asm/vdso.h>
#define VDSO_HAS_CLOCK_GETRES 1
#ifdef CONFIG_MIPS_CLOCK_VSYSCALL
static __always_inline long gettimeofday_fallback(
@@ -79,6 +81,30 @@ static __always_inline long clock_gettime_fallback(
return error ? -ret : ret;
}
static __always_inline int clock_getres_fallback(
clockid_t _clkid,
struct __kernel_timespec *_ts)
{
register struct __kernel_timespec *ts asm("a1") = _ts;
register clockid_t clkid asm("a0") = _clkid;
register long ret asm("v0");
#if _MIPS_SIM == _MIPS_SIM_ABI64
register long nr asm("v0") = __NR_clock_getres;
#else
register long nr asm("v0") = __NR_clock_getres_time64;
#endif
register long error asm("a3");
asm volatile(
" syscall\n"
: "=r" (ret), "=r" (error)
: "r" (clkid), "r" (ts), "r" (nr)
: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
"$14", "$15", "$24", "$25", "hi", "lo", "memory");
return error ? -ret : ret;
}
#ifdef CONFIG_CSRC_R4K
static __always_inline u64 read_r4k_count(void)