diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/clocksource.h | 7 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/ppc_asm.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/vdso/clocksource.h | 7 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/vdso/gettimeofday.h | 187 | ||||
| -rw-r--r-- | arch/powerpc/kernel/vdso32/vgettimeofday.c | 28 | ||||
| -rw-r--r-- | arch/powerpc/kernel/vdso64/vgettimeofday.c | 29 |
6 files changed, 260 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/clocksource.h b/arch/powerpc/include/asm/clocksource.h new file mode 100644 index 000000000000..0a26ef13a34a --- /dev/null +++ b/arch/powerpc/include/asm/clocksource.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_CLOCKSOURCE_H +#define _ASM_POWERPC_CLOCKSOURCE_H + +#include <asm/vdso/clocksource.h> + +#endif /* _ASM_POWERPC_CLOCKSOURCE_H */ diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index 101986d4a29d..cfa814824285 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -251,6 +251,8 @@ n: #define _GLOBAL_TOC(name) _GLOBAL(name) +#define DOTSYM(a) a + #endif /* diff --git a/arch/powerpc/include/asm/vdso/clocksource.h b/arch/powerpc/include/asm/vdso/clocksource.h new file mode 100644 index 000000000000..c1ba56b82ee5 --- /dev/null +++ b/arch/powerpc/include/asm/vdso/clocksource.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_VDSO_CLOCKSOURCE_H +#define _ASM_POWERPC_VDSO_CLOCKSOURCE_H + +#define VDSO_ARCH_CLOCKMODES VDSO_CLOCKMODE_ARCHTIMER + +#endif diff --git a/arch/powerpc/include/asm/vdso/gettimeofday.h b/arch/powerpc/include/asm/vdso/gettimeofday.h new file mode 100644 index 000000000000..43dd1dc47c37 --- /dev/null +++ b/arch/powerpc/include/asm/vdso/gettimeofday.h @@ -0,0 +1,187 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_VDSO_GETTIMEOFDAY_H +#define _ASM_POWERPC_VDSO_GETTIMEOFDAY_H + +#ifdef __ASSEMBLY__ + +#include <asm/ppc_asm.h> + +/* + * The macros sets two stack frames, one for the caller and one for the callee + * because there are no requirement for the caller to set a stack frame when + * calling VDSO so it may have omitted to set one, especially on PPC64 + */ + +.macro cvdso_call funct + .cfi_startproc + PPC_STLU r1, -PPC_MIN_STKFRM(r1) + mflr r0 + .cfi_register lr, r0 + PPC_STLU r1, -PPC_MIN_STKFRM(r1) + PPC_STL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) + get_datapage r5, r0 + addi r5, r5, VDSO_DATA_OFFSET + bl DOTSYM(\funct) + PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) + cmpwi r3, 0 + mtlr r0 + .cfi_restore lr + addi r1, r1, 2 * PPC_MIN_STKFRM + crclr so + beqlr+ + crset so + neg r3, r3 + blr + .cfi_endproc +.endm + +.macro cvdso_call_time funct + .cfi_startproc + PPC_STLU r1, -PPC_MIN_STKFRM(r1) + mflr r0 + .cfi_register lr, r0 + PPC_STLU r1, -PPC_MIN_STKFRM(r1) + PPC_STL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) + get_datapage r4, r0 + addi r4, r4, VDSO_DATA_OFFSET + bl DOTSYM(\funct) + PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) + crclr so + mtlr r0 + .cfi_restore lr + addi r1, r1, 2 * PPC_MIN_STKFRM + blr + .cfi_endproc +.endm + +#else + +#include <asm/vdso/timebase.h> +#include <asm/barrier.h> +#include <asm/unistd.h> +#include <uapi/linux/time.h> + +#define VDSO_HAS_CLOCK_GETRES 1 + +#define VDSO_HAS_TIME 1 + +static __always_inline int do_syscall_2(const unsigned long _r0, const unsigned long _r3, + const unsigned long _r4) +{ + register long r0 asm("r0") = _r0; + register unsigned long r3 asm("r3") = _r3; + register unsigned long r4 asm("r4") = _r4; + register int ret asm ("r3"); + + asm volatile( + " sc\n" + " bns+ 1f\n" + " neg %0, %0\n" + "1:\n" + : "=r" (ret), "+r" (r4), "+r" (r0) + : "r" (r3) + : "memory", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "cr0", "ctr"); + + return ret; +} + +static __always_inline +int gettimeofday_fallback(struct __kernel_old_timeval *_tv, struct timezone *_tz) +{ + return do_syscall_2(__NR_gettimeofday, (unsigned long)_tv, (unsigned long)_tz); +} + +static __always_inline +int clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) +{ + return do_syscall_2(__NR_clock_gettime, _clkid, (unsigned long)_ts); +} + +static __always_inline +int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) +{ + return do_syscall_2(__NR_clock_getres, _clkid, (unsigned long)_ts); +} + +#ifdef CONFIG_VDSO32 + +#define BUILD_VDSO32 1 + +static __always_inline +int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) +{ + return do_syscall_2(__NR_clock_gettime, _clkid, (unsigned long)_ts); +} + +static __always_inline +int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) +{ + return do_syscall_2(__NR_clock_getres, _clkid, (unsigned long)_ts); +} +#endif + +static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, + const struct vdso_data *vd) +{ + return get_tb(); +} + +const struct vdso_data *__arch_get_vdso_data(void); + +static inline bool vdso_clocksource_ok(const struct vdso_data *vd) +{ + return true; +} +#define vdso_clocksource_ok vdso_clocksource_ok + +/* + * powerpc specific delta calculation. + * + * This variant removes the masking of the subtraction because the + * clocksource mask of all VDSO capable clocksources on powerpc is U64_MAX + * which would result in a pointless operation. The compiler cannot + * optimize it away as the mask comes from the vdso data and is not compile + * time constant. + */ +static __always_inline u64 vdso_calc_delta(u64 cycles, u64 last, u64 mask, u32 mult) +{ + return (cycles - last) * mult; +} +#define vdso_calc_delta vdso_calc_delta + +#ifndef __powerpc64__ +static __always_inline u64 vdso_shift_ns(u64 ns, unsigned long shift) +{ + u32 hi = ns >> 32; + u32 lo = ns; + + lo >>= shift; + lo |= hi << (32 - shift); + hi >>= shift; + + if (likely(hi == 0)) + return lo; + + return ((u64)hi << 32) | lo; +} +#define vdso_shift_ns vdso_shift_ns +#endif + +#ifdef __powerpc64__ +int __c_kernel_clock_gettime(clockid_t clock, struct __kernel_timespec *ts, + const struct vdso_data *vd); +int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res, + const struct vdso_data *vd); +#else +int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, + const struct vdso_data *vd); +int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, + const struct vdso_data *vd); +#endif +int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz, + const struct vdso_data *vd); +__kernel_old_time_t __c_kernel_time(__kernel_old_time_t *time, + const struct vdso_data *vd); +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_POWERPC_VDSO_GETTIMEOFDAY_H */ diff --git a/arch/powerpc/kernel/vdso32/vgettimeofday.c b/arch/powerpc/kernel/vdso32/vgettimeofday.c new file mode 100644 index 000000000000..0d4bc217529e --- /dev/null +++ b/arch/powerpc/kernel/vdso32/vgettimeofday.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Powerpc userspace implementations of gettimeofday() and similar. + */ +#include <linux/types.h> + +int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, + const struct vdso_data *vd) +{ + return __cvdso_clock_gettime32_data(vd, clock, ts); +} + +int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz, + const struct vdso_data *vd) +{ + return __cvdso_gettimeofday_data(vd, tv, tz); +} + +int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, + const struct vdso_data *vd) +{ + return __cvdso_clock_getres_time32_data(vd, clock_id, res); +} + +__kernel_old_time_t __c_kernel_time(__kernel_old_time_t *time, const struct vdso_data *vd) +{ + return __cvdso_time_data(vd, time); +} diff --git a/arch/powerpc/kernel/vdso64/vgettimeofday.c b/arch/powerpc/kernel/vdso64/vgettimeofday.c new file mode 100644 index 000000000000..5b5500058344 --- /dev/null +++ b/arch/powerpc/kernel/vdso64/vgettimeofday.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Powerpc userspace implementations of gettimeofday() and similar. + */ +#include <linux/time.h> +#include <linux/types.h> + +int __c_kernel_clock_gettime(clockid_t clock, struct __kernel_timespec *ts, + const struct vdso_data *vd) +{ + return __cvdso_clock_gettime_data(vd, clock, ts); +} + +int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz, + const struct vdso_data *vd) +{ + return __cvdso_gettimeofday_data(vd, tv, tz); +} + +int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res, + const struct vdso_data *vd) +{ + return __cvdso_clock_getres_data(vd, clock_id, res); +} + +__kernel_old_time_t __c_kernel_time(__kernel_old_time_t *time, const struct vdso_data *vd) +{ + return __cvdso_time_data(vd, time); +} |