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/* * Copyright (C) 2018 ARM Limited * Copyright (C) 2015 Imagination Technologies * Author: Alex Smith <alex.smith@imgtec.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. / #ifndef __ASM_VDSO_GETTIMEOFDAY_H #define __ASM_VDSO_GETTIMEOFDAY_H #ifndef __ASSEMBLY__ #include <linux/compiler.h> #include <linux/time.h> #include <asm/vdso/vdso.h> #include <asm/clocksource.h> #include <asm/io.h> #include <asm/unistd.h> #include <asm/vdso.h> #define VDSO_HAS_CLOCK_GETRES 1 #define __VDSO_USE_SYSCALL ULLONG_MAX #if MIPS_ISA_REV < 6 #define VDSO_SYSCALL_CLOBBERS "hi", "lo", #else #define VDSO_SYSCALL_CLOBBERS #endif static __always_inline long gettimeofday_fallback( struct __kernel_old_timeval _tv, struct timezone _tz) { register struct timezone tz asm("a1") = _tz; register struct __kernel_old_timeval tv asm("a0") = _tv; register long ret asm("v0"); register long nr asm("v0") = __NR_gettimeofday; register long error asm("a3"); asm volatile( " syscall\n" : "=r" (ret), "=r" (error) : "r" (tv), "r" (tz), "r" (nr) : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", VDSO_SYSCALL_CLOBBERS "memory"); return error ? -ret : ret; } static __always_inline long clock_gettime_fallback( clockid_t _clkid, struct __kernel_timespec _ts) { register struct __kernel_timespec ts asm("a1") = _ts; register clockid_t clkid asm("a0") = _clkid; register long ret asm("v0"); #if _MIPS_SIM == _MIPS_SIM_ABI64 register long nr asm("v0") = __NR_clock_gettime; #else register long nr asm("v0") = __NR_clock_gettime64; #endif register long error asm("a3"); asm volatile( " syscall\n" : "=r" (ret), "=r" (error) : "r" (clkid), "r" (ts), "r" (nr) : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", VDSO_SYSCALL_CLOBBERS "memory"); return error ? -ret : ret; } static __always_inline int clock_getres_fallback( clockid_t _clkid, struct __kernel_timespec _ts) { register struct __kernel_timespec ts asm("a1") = _ts; register clockid_t clkid asm("a0") = _clkid; register long ret asm("v0"); #if _MIPS_SIM == _MIPS_SIM_ABI64 register long nr asm("v0") = __NR_clock_getres; #else register long nr asm("v0") = __NR_clock_getres_time64; #endif register long error asm("a3"); asm volatile( " syscall\n" : "=r" (ret), "=r" (error) : "r" (clkid), "r" (ts), "r" (nr) : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", VDSO_SYSCALL_CLOBBERS "memory"); return error ? -ret : ret; } #if _MIPS_SIM != _MIPS_SIM_ABI64 #define VDSO_HAS_32BIT_FALLBACK 1 static __always_inline long clock_gettime32_fallback( clockid_t _clkid, struct old_timespec32 _ts) { register struct old_timespec32 ts asm("a1") = _ts; register clockid_t clkid asm("a0") = _clkid; register long ret asm("v0"); register long nr asm("v0") = __NR_clock_gettime; register long error asm("a3"); asm volatile( " syscall\n" : "=r" (ret), "=r" (error) : "r" (clkid), "r" (ts), "r" (nr) : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", VDSO_SYSCALL_CLOBBERS "memory"); return error ? -ret : ret; } static __always_inline int clock_getres32_fallback( clockid_t _clkid, struct old_timespec32 _ts) { register struct old_timespec32 ts asm("a1") = _ts; register clockid_t clkid asm("a0") = _clkid; register long ret asm("v0"); register long nr asm("v0") = __NR_clock_getres; register long error asm("a3"); asm volatile( " syscall\n" : "=r" (ret), "=r" (error) : "r" (clkid), "r" (ts), "r" (nr) : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", VDSO_SYSCALL_CLOBBERS "memory"); return error ? -ret : ret; } #endif #ifdef CONFIG_CSRC_R4K static __always_inline u64 read_r4k_count(void) { unsigned int count; __asm__ __volatile__( " .set push\n" " .set mips32r2\n" " rdhwr %0, $2\n" " .set pop\n" : "=r" (count)); return count; } #endif #ifdef CONFIG_CLKSRC_MIPS_GIC static __always_inline u64 read_gic_count(const struct vdso_data data) { void __iomem gic = get_gic(data); u32 hi, hi2, lo; do { hi = __raw_readl(gic + sizeof(lo)); lo = __raw_readl(gic); hi2 = __raw_readl(gic + sizeof(lo)); } while (hi2 != hi); return (((u64)hi) << 32) + lo; } #endif static __always_inline u64 __arch_get_hw_counter(s32 clock_mode) { #ifdef CONFIG_CLKSRC_MIPS_GIC const struct vdso_data data = get_vdso_data(); #endif u64 cycle_now; switch (clock_mode) { #ifdef CONFIG_CSRC_R4K case VDSO_CLOCK_R4K: cycle_now = read_r4k_count(); break; #endif #ifdef CONFIG_CLKSRC_MIPS_GIC case VDSO_CLOCK_GIC: cycle_now = read_gic_count(data); break; #endif default: cycle_now = __VDSO_USE_SYSCALL; break; } return cycle_now; } static __always_inline const struct vdso_data __arch_get_vdso_data(void) { return get_vdso_data(); } #endif / !__ASSEMBLY__ / #endif / __ASM_VDSO_GETTIMEOFDAY_H */

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