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| 2 | |
| 3 | * Copyright (C) 2020 Intel Corporation
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| 4 | * Author: Johannes Berg <[email protected]>
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| 5 |
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| 6 | #include <stdbool.h>
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| 7 | #include <os.h>
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| 8 | #include <errno.h>
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| 9 | #include <sched.h>
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| 10 | #include <unistd.h>
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| 11 | #include <kern_util.h>
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| 12 | #include <sys/select.h>
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| 13 | #include <stdio.h>
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| 14 | #include <sys/timerfd.h>
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| 15 | #include "rtc.h"
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| 16 |
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| 17 | static int uml_rtc_irq_fds[2];
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| 18 |
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| 19 | void uml_rtc_send_timetravel_alarm(void)
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| 20 | {
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| 21 | unsigned long long c = 1;
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| 22 |
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| 23 | CATCH_EINTR(write(uml_rtc_irq_fds[1], &c, sizeof(c)));
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| 24 | }
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| 25 |
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| 26 | int uml_rtc_start(bool timetravel)
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| 27 | {
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| 28 | int err;
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| 29 |
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| 30 | if (timetravel) {
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| 31 | err = os_pipe(uml_rtc_irq_fds, 1, 1);
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| 32 | if (err)
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| 33 | goto fail;
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| 34 | } else {
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| 35 | uml_rtc_irq_fds[0] = timerfd_create(CLOCK_REALTIME, TFD_CLOEXEC);
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| 36 | if (uml_rtc_irq_fds[0] < 0) {
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| 37 | err = -errno;
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| 38 | goto fail;
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| 39 | }
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| 40 |
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| 41 |
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| 42 | sigio_broken();
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| 43 | err = add_sigio_fd(uml_rtc_irq_fds[0]);
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| 44 | if (err < 0) {
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| 45 | close(uml_rtc_irq_fds[0]);
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| 46 | goto fail;
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| 47 | }
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| 48 | }
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| 49 |
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| 50 | return uml_rtc_irq_fds[0];
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| 51 | fail:
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| 52 | uml_rtc_stop(timetravel);
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| 53 | return err;
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| 54 | }
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| 55 |
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| 56 | int uml_rtc_enable_alarm(unsigned long long delta_seconds)
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| 57 | {
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| 58 | struct itimerspec it = {
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| 59 | .it_value = {
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| 60 | .tv_sec = delta_seconds,
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| 61 | },
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| 62 | };
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| 63 |
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| 64 | if (timerfd_settime(uml_rtc_irq_fds[0], 0, &it, NULL))
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| 65 | return -errno;
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| 66 | return 0;
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| 67 | }
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| 68 |
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| 69 | void uml_rtc_disable_alarm(void)
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| 70 | {
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| 71 | uml_rtc_enable_alarm(0);
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| 72 | }
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| 73 |
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| 74 | void uml_rtc_stop(bool timetravel)
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| 75 | {
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| 76 | if (timetravel)
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| 77 | os_close_file(uml_rtc_irq_fds[1]);
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| 78 | else
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| 79 | ignore_sigio_fd(uml_rtc_irq_fds[0]);
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| 80 | os_close_file(uml_rtc_irq_fds[0]);
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| 81 | }
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