808094fcbf
For the same reason as commit e876f0b69d ("lib/vdso: Allow
architectures to provide the vdso data pointer"), powerpc wants to
avoid calculation of relative position to code.
As the timens_vdso_data is next page to vdso_data, provide
vdso_data pointer to __arch_get_timens_vdso_data() in order
to ease the calculation on powerpc in following patches.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/539c4204b1baa77c55f758904a1ea239abbc7a5c.1617209142.git.christophe.leroy@csgroup.eu
78 lines
2 KiB
C
78 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef ASM_VDSO_GETTIMEOFDAY_H
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#define ASM_VDSO_GETTIMEOFDAY_H
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#define VDSO_HAS_TIME 1
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#define VDSO_HAS_CLOCK_GETRES 1
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#include <asm/timex.h>
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#include <asm/unistd.h>
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#include <asm/vdso.h>
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#include <linux/compiler.h>
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#define vdso_calc_delta __arch_vdso_calc_delta
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static __always_inline u64 __arch_vdso_calc_delta(u64 cycles, u64 last, u64 mask, u32 mult)
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{
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return (cycles - last) * mult;
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}
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static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
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{
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return _vdso_data;
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}
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static inline u64 __arch_get_hw_counter(s32 clock_mode, const struct vdso_data *vd)
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{
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u64 adj, now;
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now = get_tod_clock();
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adj = vd->arch_data.tod_steering_end - now;
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if (unlikely((s64) adj > 0))
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now += (vd->arch_data.tod_steering_delta < 0) ? (adj >> 15) : -(adj >> 15);
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return now;
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}
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static __always_inline
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long clock_gettime_fallback(clockid_t clkid, struct __kernel_timespec *ts)
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{
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register unsigned long r1 __asm__("r1") = __NR_clock_gettime;
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register unsigned long r2 __asm__("r2") = (unsigned long)clkid;
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register void *r3 __asm__("r3") = ts;
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asm ("svc 0\n" : "+d" (r2) : "d" (r1), "d" (r3) : "cc", "memory");
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return r2;
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}
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static __always_inline
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long gettimeofday_fallback(register struct __kernel_old_timeval *tv,
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register struct timezone *tz)
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{
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register unsigned long r1 __asm__("r1") = __NR_gettimeofday;
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register unsigned long r2 __asm__("r2") = (unsigned long)tv;
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register void *r3 __asm__("r3") = tz;
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asm ("svc 0\n" : "+d" (r2) : "d" (r1), "d" (r3) : "cc", "memory");
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return r2;
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}
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static __always_inline
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long clock_getres_fallback(clockid_t clkid, struct __kernel_timespec *ts)
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{
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register unsigned long r1 __asm__("r1") = __NR_clock_getres;
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register unsigned long r2 __asm__("r2") = (unsigned long)clkid;
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register void *r3 __asm__("r3") = ts;
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asm ("svc 0\n" : "+d" (r2) : "d" (r1), "d" (r3) : "cc", "memory");
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return r2;
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}
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#ifdef CONFIG_TIME_NS
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static __always_inline
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const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
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{
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return _timens_data;
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}
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#endif
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#endif
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