Thomas Weißschuh
91d2a1a916
The syscall definitions can be built just fine for 32-bit systems. Also the guard does not cover __arch_get_hw_counter() which is always used together with those system call fallbacks. Also this header is unused when no vDSO is built anyways. Drop the ifdeffery. The logic will be simpler to understand. Furthermore this prepares the complete removal of CONFIG_GENERIC_TIME_VSYSCALL. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260519-vdso-generic_time_vsyscal-v1-1-5c2a5905d5f5@linutronix.de
77 lines
1.9 KiB
C
77 lines
1.9 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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#ifndef __ASSEMBLER__
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#include <asm/barrier.h>
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#include <asm/unistd.h>
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#include <asm/csr.h>
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#include <uapi/linux/time.h>
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#define VDSO_HAS_CLOCK_GETRES 1
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static __always_inline
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int gettimeofday_fallback(struct __kernel_old_timeval *_tv,
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struct timezone *_tz)
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{
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register struct __kernel_old_timeval *tv asm("a0") = _tv;
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register struct timezone *tz asm("a1") = _tz;
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register long ret asm("a0");
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register long nr asm("a7") = __NR_gettimeofday;
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asm volatile ("ecall\n"
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: "=r" (ret)
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: "r"(tv), "r"(tz), "r"(nr)
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: "memory");
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return ret;
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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 clockid_t clkid asm("a0") = _clkid;
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register struct __kernel_timespec *ts asm("a1") = _ts;
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register long ret asm("a0");
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register long nr asm("a7") = __NR_clock_gettime;
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asm volatile ("ecall\n"
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: "=r" (ret)
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: "r"(clkid), "r"(ts), "r"(nr)
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: "memory");
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return ret;
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}
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static __always_inline
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int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
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{
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register clockid_t clkid asm("a0") = _clkid;
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register struct __kernel_timespec *ts asm("a1") = _ts;
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register long ret asm("a0");
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register long nr asm("a7") = __NR_clock_getres;
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asm volatile ("ecall\n"
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: "=r" (ret)
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: "r"(clkid), "r"(ts), "r"(nr)
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: "memory");
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return ret;
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}
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static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
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const struct vdso_time_data *vd)
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{
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/*
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* The purpose of csr_read(CSR_TIME) is to trap the system into
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* M-mode to obtain the value of CSR_TIME. Hence, unlike other
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* architecture, no fence instructions surround the csr_read()
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*/
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return csr_read(CSR_TIME);
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}
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#endif /* !__ASSEMBLER__ */
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#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
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