diff options
Diffstat (limited to 'arch/riscv/include/asm/vdso')
| -rw-r--r-- | arch/riscv/include/asm/vdso/clocksource.h | 8 | ||||
| -rw-r--r-- | arch/riscv/include/asm/vdso/gettimeofday.h | 88 | ||||
| -rw-r--r-- | arch/riscv/include/asm/vdso/processor.h | 36 | ||||
| -rw-r--r-- | arch/riscv/include/asm/vdso/vsyscall.h | 27 |
4 files changed, 159 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/vdso/clocksource.h b/arch/riscv/include/asm/vdso/clocksource.h new file mode 100644 index 000000000..df6ea65c1 --- /dev/null +++ b/arch/riscv/include/asm/vdso/clocksource.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_VDSOCLOCKSOURCE_H +#define __ASM_VDSOCLOCKSOURCE_H + +#define VDSO_ARCH_CLOCKMODES \ + VDSO_CLOCKMODE_ARCHTIMER + +#endif diff --git a/arch/riscv/include/asm/vdso/gettimeofday.h b/arch/riscv/include/asm/vdso/gettimeofday.h new file mode 100644 index 000000000..77d9c2f72 --- /dev/null +++ b/arch/riscv/include/asm/vdso/gettimeofday.h @@ -0,0 +1,88 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_VDSO_GETTIMEOFDAY_H +#define __ASM_VDSO_GETTIMEOFDAY_H + +#ifndef __ASSEMBLY__ + +#include <asm/barrier.h> +#include <asm/unistd.h> +#include <asm/csr.h> +#include <uapi/linux/time.h> + +#define VDSO_HAS_CLOCK_GETRES 1 + +static __always_inline +int gettimeofday_fallback(struct __kernel_old_timeval *_tv, + struct timezone *_tz) +{ + register struct __kernel_old_timeval *tv asm("a0") = _tv; + register struct timezone *tz asm("a1") = _tz; + register long ret asm("a0"); + register long nr asm("a7") = __NR_gettimeofday; + + asm volatile ("ecall\n" + : "=r" (ret) + : "r"(tv), "r"(tz), "r"(nr) + : "memory"); + + return ret; +} + +static __always_inline +long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) +{ + register clockid_t clkid asm("a0") = _clkid; + register struct __kernel_timespec *ts asm("a1") = _ts; + register long ret asm("a0"); + register long nr asm("a7") = __NR_clock_gettime; + + asm volatile ("ecall\n" + : "=r" (ret) + : "r"(clkid), "r"(ts), "r"(nr) + : "memory"); + + return ret; +} + +static __always_inline +int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) +{ + register clockid_t clkid asm("a0") = _clkid; + register struct __kernel_timespec *ts asm("a1") = _ts; + register long ret asm("a0"); + register long nr asm("a7") = __NR_clock_getres; + + asm volatile ("ecall\n" + : "=r" (ret) + : "r"(clkid), "r"(ts), "r"(nr) + : "memory"); + + return ret; +} + +static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, + const struct vdso_data *vd) +{ + /* + * The purpose of csr_read(CSR_TIME) is to trap the system into + * M-mode to obtain the value of CSR_TIME. Hence, unlike other + * architecture, no fence instructions surround the csr_read() + */ + return csr_read(CSR_TIME); +} + +static __always_inline const struct vdso_data *__arch_get_vdso_data(void) +{ + return _vdso_data; +} + +#ifdef CONFIG_TIME_NS +static __always_inline +const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd) +{ + return _timens_data; +} +#endif +#endif /* !__ASSEMBLY__ */ + +#endif /* __ASM_VDSO_GETTIMEOFDAY_H */ diff --git a/arch/riscv/include/asm/vdso/processor.h b/arch/riscv/include/asm/vdso/processor.h new file mode 100644 index 000000000..fa70cfe50 --- /dev/null +++ b/arch/riscv/include/asm/vdso/processor.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __ASM_VDSO_PROCESSOR_H +#define __ASM_VDSO_PROCESSOR_H + +#ifndef __ASSEMBLY__ + +#include <linux/jump_label.h> +#include <asm/barrier.h> +#include <asm/hwcap.h> + +static inline void cpu_relax(void) +{ + if (!static_branch_likely(&riscv_isa_ext_keys[RISCV_ISA_EXT_KEY_ZIHINTPAUSE])) { +#ifdef __riscv_muldiv + int dummy; + /* In lieu of a halt instruction, induce a long-latency stall. */ + __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy)); +#endif + } else { + /* + * Reduce instruction retirement. + * This assumes the PC changes. + */ +#ifdef CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE + __asm__ __volatile__ ("pause"); +#else + /* Encoding of the pause instruction */ + __asm__ __volatile__ (".4byte 0x100000F"); +#endif + } + barrier(); +} + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_VDSO_PROCESSOR_H */ diff --git a/arch/riscv/include/asm/vdso/vsyscall.h b/arch/riscv/include/asm/vdso/vsyscall.h new file mode 100644 index 000000000..82fd5d83b --- /dev/null +++ b/arch/riscv/include/asm/vdso/vsyscall.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_VDSO_VSYSCALL_H +#define __ASM_VDSO_VSYSCALL_H + +#ifndef __ASSEMBLY__ + +#include <linux/timekeeper_internal.h> +#include <vdso/datapage.h> + +extern struct vdso_data *vdso_data; + +/* + * Update the vDSO data page to keep in sync with kernel timekeeping. + */ +static __always_inline struct vdso_data *__riscv_get_k_vdso_data(void) +{ + return vdso_data; +} + +#define __arch_get_k_vdso_data __riscv_get_k_vdso_data + +/* The asm-generic header needs to be included after the definitions above */ +#include <asm-generic/vdso/vsyscall.h> + +#endif /* !__ASSEMBLY__ */ + +#endif /* __ASM_VDSO_VSYSCALL_H */ |