diff options
Diffstat (limited to 'arch/loongarch/include/asm/vdso')
| -rw-r--r-- | arch/loongarch/include/asm/vdso/clocksource.h | 8 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/vdso/gettimeofday.h | 106 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/vdso/processor.h | 14 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/vdso/vdso.h | 65 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/vdso/vsyscall.h | 27 |
5 files changed, 220 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/vdso/clocksource.h b/arch/loongarch/include/asm/vdso/clocksource.h new file mode 100644 index 0000000000..13cd580d40 --- /dev/null +++ b/arch/loongarch/include/asm/vdso/clocksource.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __ASM_VDSOCLOCKSOURCE_H +#define __ASM_VDSOCLOCKSOURCE_H + +#define VDSO_ARCH_CLOCKMODES \ + VDSO_CLOCKMODE_CPU + +#endif /* __ASM_VDSOCLOCKSOURCE_H */ diff --git a/arch/loongarch/include/asm/vdso/gettimeofday.h b/arch/loongarch/include/asm/vdso/gettimeofday.h new file mode 100644 index 0000000000..89e6b222c2 --- /dev/null +++ b/arch/loongarch/include/asm/vdso/gettimeofday.h @@ -0,0 +1,106 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Author: Huacai Chen <chenhuacai@loongson.cn> + * + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + */ +#ifndef __ASM_VDSO_GETTIMEOFDAY_H +#define __ASM_VDSO_GETTIMEOFDAY_H + +#ifndef __ASSEMBLY__ + +#include <asm/unistd.h> +#include <asm/vdso/vdso.h> + +#define VDSO_HAS_CLOCK_GETRES 1 + +static __always_inline long 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 nr asm("a7") = __NR_gettimeofday; + register long ret asm("a0"); + + asm volatile( + " syscall 0\n" + : "+r" (ret) + : "r" (nr), "r" (tv), "r" (tz) + : "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", + "$t8", "memory"); + + return ret; +} + +static __always_inline long clock_gettime_fallback( + clockid_t _clkid, + struct __kernel_timespec *_ts) +{ + register clockid_t clkid asm("a0") = _clkid; + register struct __kernel_timespec *ts asm("a1") = _ts; + register long nr asm("a7") = __NR_clock_gettime; + register long ret asm("a0"); + + asm volatile( + " syscall 0\n" + : "+r" (ret) + : "r" (nr), "r" (clkid), "r" (ts) + : "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", + "$t8", "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 nr asm("a7") = __NR_clock_getres; + register long ret asm("a0"); + + asm volatile( + " syscall 0\n" + : "+r" (ret) + : "r" (nr), "r" (clkid), "r" (ts) + : "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", + "$t8", "memory"); + + return ret; +} + +static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, + const struct vdso_data *vd) +{ + uint64_t count; + + __asm__ __volatile__( + " rdtime.d %0, $zero\n" + : "=r" (count)); + + return count; +} + +static inline bool loongarch_vdso_hres_capable(void) +{ + return true; +} +#define __arch_vdso_hres_capable loongarch_vdso_hres_capable + +static __always_inline const struct vdso_data *__arch_get_vdso_data(void) +{ + return (const struct vdso_data *)get_vdso_data(); +} + +#ifdef CONFIG_TIME_NS +static __always_inline +const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd) +{ + return (const struct vdso_data *)(get_vdso_data() + VVAR_TIMENS_PAGE_OFFSET * PAGE_SIZE); +} +#endif +#endif /* !__ASSEMBLY__ */ + +#endif /* __ASM_VDSO_GETTIMEOFDAY_H */ diff --git a/arch/loongarch/include/asm/vdso/processor.h b/arch/loongarch/include/asm/vdso/processor.h new file mode 100644 index 0000000000..ef5770b343 --- /dev/null +++ b/arch/loongarch/include/asm/vdso/processor.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + */ +#ifndef __ASM_VDSO_PROCESSOR_H +#define __ASM_VDSO_PROCESSOR_H + +#ifndef __ASSEMBLY__ + +#define cpu_relax() barrier() + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_VDSO_PROCESSOR_H */ diff --git a/arch/loongarch/include/asm/vdso/vdso.h b/arch/loongarch/include/asm/vdso/vdso.h new file mode 100644 index 0000000000..5a12309d9f --- /dev/null +++ b/arch/loongarch/include/asm/vdso/vdso.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Author: Huacai Chen <chenhuacai@loongson.cn> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + */ + +#ifndef __ASSEMBLY__ + +#include <asm/asm.h> +#include <asm/page.h> +#include <asm/vdso.h> + +struct vdso_pcpu_data { + u32 node; +} ____cacheline_aligned_in_smp; + +struct loongarch_vdso_data { + struct vdso_pcpu_data pdata[NR_CPUS]; +}; + +/* + * The layout of vvar: + * + * high + * +---------------------+--------------------------+ + * | loongarch vdso data | LOONGARCH_VDSO_DATA_SIZE | + * +---------------------+--------------------------+ + * | time-ns vdso data | PAGE_SIZE | + * +---------------------+--------------------------+ + * | generic vdso data | PAGE_SIZE | + * +---------------------+--------------------------+ + * low + */ +#define LOONGARCH_VDSO_DATA_SIZE PAGE_ALIGN(sizeof(struct loongarch_vdso_data)) +#define LOONGARCH_VDSO_DATA_PAGES (LOONGARCH_VDSO_DATA_SIZE >> PAGE_SHIFT) + +enum vvar_pages { + VVAR_GENERIC_PAGE_OFFSET, + VVAR_TIMENS_PAGE_OFFSET, + VVAR_LOONGARCH_PAGES_START, + VVAR_LOONGARCH_PAGES_END = VVAR_LOONGARCH_PAGES_START + LOONGARCH_VDSO_DATA_PAGES - 1, + VVAR_NR_PAGES, +}; + +#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT) + +static inline unsigned long get_vdso_base(void) +{ + unsigned long addr; + + __asm__( + " la.pcrel %0, _start\n" + : "=r" (addr) + : + :); + + return addr; +} + +static inline unsigned long get_vdso_data(void) +{ + return get_vdso_base() - VVAR_SIZE; +} + +#endif /* __ASSEMBLY__ */ diff --git a/arch/loongarch/include/asm/vdso/vsyscall.h b/arch/loongarch/include/asm/vdso/vsyscall.h new file mode 100644 index 0000000000..5de615383a --- /dev/null +++ b/arch/loongarch/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 *__loongarch_get_k_vdso_data(void) +{ + return vdso_data; +} +#define __arch_get_k_vdso_data __loongarch_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 */ |