Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright 2006 Andi Kleen, SUSE Labs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Fast user context implementation of clock_gettime, gettimeofday, and time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * The code should have no internal unresolved relocations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Check with readelf after changing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Also alternative() doesn't work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/timex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/clocksource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/vvar.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #ifdef	CONFIG_SPARC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define SYSCALL_STRING							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	"ta	0x6d;"							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	"bcs,a	1f;"							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	" sub	%%g0, %%o0, %%o0;"					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	"1:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define SYSCALL_STRING							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	"ta	0x10;"							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	"bcs,a	1f;"							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	" sub	%%g0, %%o0, %%o0;"					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	"1:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define SYSCALL_CLOBBERS						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	"f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46",		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	"f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	"cc", "memory"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * Compute the vvar page's address in the process address space, and return it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * as a pointer to the vvar_data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) notrace static __always_inline struct vvar_data *get_vvar_data(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	 * vdso data page is the first vDSO page so grab the PC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	 * and move up a page to get to the data page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	__asm__("rd %%pc, %0" : "=r" (ret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	ret &= ~(8192 - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	ret -= 8192;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	return (struct vvar_data *) ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) notrace static long vdso_fallback_gettime(long clock, struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	register long num __asm__("g1") = __NR_clock_gettime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	register long o0 __asm__("o0") = clock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	register long o1 __asm__("o1") = (long) ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	__asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			     "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	return o0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) notrace static long vdso_fallback_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	register long num __asm__("g1") = __NR_gettimeofday;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	register long o0 __asm__("o0") = (long) tv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	register long o1 __asm__("o1") = (long) tz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	__asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			     "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	return o0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) #ifdef	CONFIG_SPARC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) notrace static __always_inline u64 vread_tick(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	u64	ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	__asm__ __volatile__("rd %%tick, %0" : "=r" (ret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) notrace static __always_inline u64 vread_tick_stick(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	u64	ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	__asm__ __volatile__("rd %%asr24, %0" : "=r" (ret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) notrace static __always_inline u64 vread_tick(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	register unsigned long long ret asm("o4");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	__asm__ __volatile__("rd %%tick, %L0\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			     "srlx %L0, 32, %H0"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			     : "=r" (ret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) notrace static __always_inline u64 vread_tick_stick(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	register unsigned long long ret asm("o4");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	__asm__ __volatile__("rd %%asr24, %L0\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			     "srlx %L0, 32, %H0"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			     : "=r" (ret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) notrace static __always_inline u64 vgetsns(struct vvar_data *vvar)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	u64 v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	u64 cycles;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	cycles = vread_tick();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	v = (cycles - vvar->clock.cycle_last) & vvar->clock.mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	return v * vvar->clock.mult;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) notrace static __always_inline u64 vgetsns_stick(struct vvar_data *vvar)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	u64 v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	u64 cycles;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	cycles = vread_tick_stick();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	v = (cycles - vvar->clock.cycle_last) & vvar->clock.mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	return v * vvar->clock.mult;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) notrace static __always_inline int do_realtime(struct vvar_data *vvar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 					       struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	unsigned long seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	u64 ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		seq = vvar_read_begin(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		ts->tv_sec = vvar->wall_time_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		ns = vvar->wall_time_snsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		ns += vgetsns(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		ns >>= vvar->clock.shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	} while (unlikely(vvar_read_retry(vvar, seq)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	ts->tv_nsec = ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) notrace static __always_inline int do_realtime_stick(struct vvar_data *vvar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 						     struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	unsigned long seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	u64 ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		seq = vvar_read_begin(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		ts->tv_sec = vvar->wall_time_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		ns = vvar->wall_time_snsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		ns += vgetsns_stick(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		ns >>= vvar->clock.shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	} while (unlikely(vvar_read_retry(vvar, seq)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	ts->tv_nsec = ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 						struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	unsigned long seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	u64 ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		seq = vvar_read_begin(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		ts->tv_sec = vvar->monotonic_time_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		ns = vvar->monotonic_time_snsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		ns += vgetsns(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		ns >>= vvar->clock.shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	} while (unlikely(vvar_read_retry(vvar, seq)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	ts->tv_nsec = ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) notrace static __always_inline int do_monotonic_stick(struct vvar_data *vvar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 						      struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	unsigned long seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	u64 ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		seq = vvar_read_begin(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		ts->tv_sec = vvar->monotonic_time_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		ns = vvar->monotonic_time_snsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		ns += vgetsns_stick(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		ns >>= vvar->clock.shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	} while (unlikely(vvar_read_retry(vvar, seq)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	ts->tv_nsec = ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) notrace static int do_realtime_coarse(struct vvar_data *vvar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 				      struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	unsigned long seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		seq = vvar_read_begin(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		ts->tv_sec = vvar->wall_time_coarse_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		ts->tv_nsec = vvar->wall_time_coarse_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	} while (unlikely(vvar_read_retry(vvar, seq)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) notrace static int do_monotonic_coarse(struct vvar_data *vvar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 				       struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	unsigned long seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		seq = vvar_read_begin(vvar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		ts->tv_sec = vvar->monotonic_time_coarse_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		ts->tv_nsec = vvar->monotonic_time_coarse_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	} while (unlikely(vvar_read_retry(vvar, seq)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) notrace int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct vvar_data *vvd = get_vvar_data();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	switch (clock) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	case CLOCK_REALTIME:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		return do_realtime(vvd, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	case CLOCK_MONOTONIC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		return do_monotonic(vvd, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	case CLOCK_REALTIME_COARSE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		return do_realtime_coarse(vvd, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	case CLOCK_MONOTONIC_COARSE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		return do_monotonic_coarse(vvd, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	 * Unknown clock ID ? Fall back to the syscall.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	return vdso_fallback_gettime(clock, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) clock_gettime(clockid_t, struct __kernel_old_timespec *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	__attribute__((weak, alias("__vdso_clock_gettime")));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) notrace int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) __vdso_clock_gettime_stick(clockid_t clock, struct __kernel_old_timespec *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	struct vvar_data *vvd = get_vvar_data();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	switch (clock) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	case CLOCK_REALTIME:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		return do_realtime_stick(vvd, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	case CLOCK_MONOTONIC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		return do_monotonic_stick(vvd, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	case CLOCK_REALTIME_COARSE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		return do_realtime_coarse(vvd, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	case CLOCK_MONOTONIC_COARSE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		return do_monotonic_coarse(vvd, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	 * Unknown clock ID ? Fall back to the syscall.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	return vdso_fallback_gettime(clock, ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) notrace int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	struct vvar_data *vvd = get_vvar_data();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	if (likely(vvd->vclock_mode != VCLOCK_NONE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		if (likely(tv != NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 			union tstv_t {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 				struct __kernel_old_timespec ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 				struct __kernel_old_timeval tv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 			} *tstv = (union tstv_t *) tv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			do_realtime(vvd, &tstv->ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			 * Assign before dividing to ensure that the division is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 			 * done in the type of tv_usec, not tv_nsec.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			 * There cannot be > 1 billion usec in a second:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			 * do_realtime() has already distributed such overflow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 			 * into tv_sec.  So we can assign it to an int safely.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 			tstv->tv.tv_usec = tstv->ts.tv_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 			tstv->tv.tv_usec /= 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		if (unlikely(tz != NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 			/* Avoid memcpy. Some old compilers fail to inline it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 			tz->tz_minuteswest = vvd->tz_minuteswest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 			tz->tz_dsttime = vvd->tz_dsttime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	return vdso_fallback_gettimeofday(tv, tz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) gettimeofday(struct __kernel_old_timeval *, struct timezone *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	__attribute__((weak, alias("__vdso_gettimeofday")));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) notrace int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) __vdso_gettimeofday_stick(struct __kernel_old_timeval *tv, struct timezone *tz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	struct vvar_data *vvd = get_vvar_data();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (likely(vvd->vclock_mode != VCLOCK_NONE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		if (likely(tv != NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			union tstv_t {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 				struct __kernel_old_timespec ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 				struct __kernel_old_timeval tv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 			} *tstv = (union tstv_t *) tv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 			do_realtime_stick(vvd, &tstv->ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			 * Assign before dividing to ensure that the division is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			 * done in the type of tv_usec, not tv_nsec.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 			 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 			 * There cannot be > 1 billion usec in a second:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 			 * do_realtime() has already distributed such overflow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 			 * into tv_sec.  So we can assign it to an int safely.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 			tstv->tv.tv_usec = tstv->ts.tv_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 			tstv->tv.tv_usec /= 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		if (unlikely(tz != NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			/* Avoid memcpy. Some old compilers fail to inline it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 			tz->tz_minuteswest = vvd->tz_minuteswest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 			tz->tz_dsttime = vvd->tz_dsttime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	return vdso_fallback_gettimeofday(tv, tz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }