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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
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GPG Key ID: 3EA79FACB57500DD
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/unistd.h>
#include <asm/vdso.h> #include <asm/vdso.h>
#define VDSO_HAS_CLOCK_GETRES 1
#ifdef CONFIG_MIPS_CLOCK_VSYSCALL #ifdef CONFIG_MIPS_CLOCK_VSYSCALL
static __always_inline long gettimeofday_fallback( static __always_inline long gettimeofday_fallback(
@ -79,6 +81,30 @@ static __always_inline long clock_gettime_fallback(
return error ? -ret : ret; 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 #ifdef CONFIG_CSRC_R4K
static __always_inline u64 read_r4k_count(void) static __always_inline u64 read_r4k_count(void)

1
arch/mips/vdso/vdso.lds.S
View File

@ -95,6 +95,7 @@ VERSION
global: global:
__vdso_clock_gettime; __vdso_clock_gettime;
__vdso_gettimeofday; __vdso_gettimeofday;
__vdso_clock_getres;
#endif #endif
local: *; local: *;
}; };

12
arch/mips/vdso/vgettimeofday.c
View File

@ -23,6 +23,12 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
return __cvdso_gettimeofday(tv, tz); 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);
}
#else #else
int __vdso_clock_gettime(clockid_t clock, int __vdso_clock_gettime(clockid_t clock,
@ -37,4 +43,10 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
return __cvdso_gettimeofday(tv, tz); return __cvdso_gettimeofday(tv, tz);
} }
int __vdso_clock_getres(clockid_t clock_id,
struct __kernel_timespec *res)
{
return __cvdso_clock_getres(clock_id, res);
}
#endif #endif