add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/um/os-Linux/time.c
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@@ -1,9 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
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  * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
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  * Copyright (C) 2012-2014 Cisco Systems
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  * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
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- * Licensed under the GPL
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  */
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 #include <stddef.h>
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@@ -14,7 +14,6 @@
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 #include <kern_util.h>
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 #include <os.h>
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 #include <string.h>
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-#include <timer-internal.h>
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 static timer_t event_high_res_timer = 0;
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@@ -26,11 +25,11 @@
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 static inline long long timespec_to_ns(const struct timespec *ts)
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 {
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-	return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) +
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-		ts->tv_nsec;
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+	return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) + ts->tv_nsec;
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 }
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-long long os_persistent_clock_emulation (void) {
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+long long os_persistent_clock_emulation(void)
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+{
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 	struct timespec realtime_tp;
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 	clock_gettime(CLOCK_REALTIME, &realtime_tp);
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@@ -40,94 +39,41 @@
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 /**
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  * os_timer_create() - create an new posix (interval) timer
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  */
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-int os_timer_create(void* timer) {
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+int os_timer_create(void)
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+{
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+	timer_t *t = &event_high_res_timer;
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-	timer_t* t = timer;
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-
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-	if(t == NULL) {
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-		t = &event_high_res_timer;
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-	}
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-
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-	if (timer_create(
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-		CLOCK_MONOTONIC,
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-		NULL,
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-		t) == -1) {
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+	if (timer_create(CLOCK_MONOTONIC, NULL, t) == -1)
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 		return -1;
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-	}
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-	return 0;
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-}
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-
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-int os_timer_set_interval(void* timer, void* i)
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-{
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-	struct itimerspec its;
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-	unsigned long long nsec;
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-	timer_t* t = timer;
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-	struct itimerspec* its_in = i;
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-
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-	if(t == NULL) {
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-		t = &event_high_res_timer;
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-	}
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-
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-	nsec = UM_NSEC_PER_SEC / UM_HZ;
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-
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-	if(its_in != NULL) {
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-		its.it_value.tv_sec = its_in->it_value.tv_sec;
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-		its.it_value.tv_nsec = its_in->it_value.tv_nsec;
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-	} else {
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-		its.it_value.tv_sec = 0;
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-		its.it_value.tv_nsec = nsec;
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-	}
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-
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-	its.it_interval.tv_sec = 0;
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-	its.it_interval.tv_nsec = nsec;
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-
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-	if(timer_settime(*t, 0, &its, NULL) == -1) {
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-		return -errno;
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-	}
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 	return 0;
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 }
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-/**
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- * os_timer_remain() - returns the remaining nano seconds of the given interval
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- *                     timer
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- * Because this is the remaining time of an interval timer, which correspondends
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- * to HZ, this value can never be bigger than one second. Just
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- * the nanosecond part of the timer is returned.
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- * The returned time is relative to the start time of the interval timer.
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- * Return an negative value in an error case.
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- */
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-long os_timer_remain(void* timer)
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+int os_timer_set_interval(unsigned long long nsecs)
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 {
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 	struct itimerspec its;
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-	timer_t* t = timer;
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-	if(t == NULL) {
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-		t = &event_high_res_timer;
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-	}
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+	its.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC;
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+	its.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC;
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-	if(timer_gettime(t, &its) == -1) {
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+	its.it_interval.tv_sec = nsecs / UM_NSEC_PER_SEC;
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+	its.it_interval.tv_nsec = nsecs % UM_NSEC_PER_SEC;
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+
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+	if (timer_settime(event_high_res_timer, 0, &its, NULL) == -1)
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 		return -errno;
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-	}
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-	return its.it_value.tv_nsec;
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+	return 0;
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 }
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-int os_timer_one_shot(int ticks)
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+int os_timer_one_shot(unsigned long long nsecs)
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 {
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-	struct itimerspec its;
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-	unsigned long long nsec;
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-	unsigned long sec;
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+	struct itimerspec its = {
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+		.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC,
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+		.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC,
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-    nsec = (ticks + 1);
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-    sec = nsec / UM_NSEC_PER_SEC;
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-	nsec = nsec % UM_NSEC_PER_SEC;
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-
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-	its.it_value.tv_sec = nsec / UM_NSEC_PER_SEC;
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-	its.it_value.tv_nsec = nsec;
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-
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-	its.it_interval.tv_sec = 0;
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-	its.it_interval.tv_nsec = 0; // we cheat here
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+		.it_interval.tv_sec = 0,
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+		.it_interval.tv_nsec = 0, // we cheat here
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+	};
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 	timer_settime(event_high_res_timer, 0, &its, NULL);
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 	return 0;
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@@ -135,24 +81,13 @@
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 /**
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  * os_timer_disable() - disable the posix (interval) timer
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- * Returns the remaining interval timer time in nanoseconds
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  */
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-long long os_timer_disable(void)
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+void os_timer_disable(void)
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 {
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 	struct itimerspec its;
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 	memset(&its, 0, sizeof(struct itimerspec));
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-	timer_settime(event_high_res_timer, 0, &its, &its);
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-
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-	return its.it_value.tv_sec * UM_NSEC_PER_SEC + its.it_value.tv_nsec;
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-}
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-
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-long long os_vnsecs(void)
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-{
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-	struct timespec ts;
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-
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-	clock_gettime(CLOCK_PROCESS_CPUTIME_ID,&ts);
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-	return timespec_to_ns(&ts);
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+	timer_settime(event_high_res_timer, 0, &its, NULL);
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 }
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 long long os_nsecs(void)
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@@ -169,21 +104,14 @@
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  */
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 void os_idle_sleep(unsigned long long nsecs)
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 {
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-	struct timespec ts;
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-
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-	if (nsecs <= 0) {
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-		return;
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-	}
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-
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-	ts = ((struct timespec) {
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-			.tv_sec  = nsecs / UM_NSEC_PER_SEC,
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-			.tv_nsec = nsecs % UM_NSEC_PER_SEC
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-	});
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+	struct timespec ts = {
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+		.tv_sec  = nsecs / UM_NSEC_PER_SEC,
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+		.tv_nsec = nsecs % UM_NSEC_PER_SEC
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+	};
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 	/*
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 	 * Relay the signal if clock_nanosleep is interrupted.
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 	 */
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-	if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL)) {
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+	if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL))
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 		deliver_alarm();
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-	}
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 }