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o Add working emulated RTC (Real Time Clock), some cleanup
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Mike Miller
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Nov 25, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| // | ||
| // RTCDevice.h | ||
| // iSH-AOK | ||
| // | ||
| // Created by Michael Miller on 11/24/23. | ||
| // | ||
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| extern struct dev_ops rtc_dev; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| // | ||
| // RTCDevice.m | ||
| // iSH-AOK | ||
| // | ||
| // Created by Michael Miller on 11/24/23. | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
| #include "fs/poll.h" | ||
| #include "fs/dyndev.h" | ||
| #include "kernel/errno.h" | ||
| #include "debug.h" | ||
| #include "fs/devices.h" | ||
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| // Real Time Clock file descriptor structure | ||
| typedef struct fd rtc_fd; | ||
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| // Need to define this, as we are running on iOS, which doesn't have/give access to the RTC | ||
| typedef struct rtc_time { | ||
| int tm_sec; // seconds | ||
| int tm_min; // minutes | ||
| int tm_hour; // hours | ||
| int tm_mday; // day of the month | ||
| int tm_mon; // month | ||
| int tm_year; // year | ||
| } rtc_time; | ||
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| // Get the time, put it in the appropriate structure | ||
| static rtc_time *get_current_time(rtc_fd *fd, size_t *len) { | ||
| // Obtain the current date | ||
| NSDate *currentDate = [NSDate date]; | ||
| NSCalendar *calendar = [NSCalendar currentCalendar]; | ||
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| // Define the desired date components | ||
| NSDateComponents *components = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond) | ||
| fromDate:currentDate]; | ||
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| // Allocate and populate the rtc_time structure | ||
| rtc_time *timeStruct = malloc(sizeof(rtc_time)); | ||
| if (!timeStruct) { | ||
| // Handle memory allocation failure | ||
| *len = 0; | ||
| return NULL; | ||
| } | ||
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| // Populate the structure | ||
| // Note: tm_mon is 0-based (0 for January) and tm_year is years since 1900 | ||
| timeStruct->tm_sec = (int)[components second]; | ||
| timeStruct->tm_min = (int)[components minute]; | ||
| timeStruct->tm_hour = (int)[components hour]; | ||
| timeStruct->tm_mday = (int)[components day]; | ||
| timeStruct->tm_mon = (int)[components month] - 1; // Adjust for tm_mon | ||
| timeStruct->tm_year = (int)[components year] - 1900; // Adjust for tm_year | ||
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| // Update the size | ||
| *len = sizeof(rtc_time); | ||
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| return timeStruct; | ||
| } | ||
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| static ssize_t rtc_read(rtc_fd *fd, void *buf, size_t bufsize) { | ||
| return 0; | ||
| } | ||
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| static int rtc_poll(rtc_fd *fd) { | ||
| return 0; | ||
| } | ||
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| static int rtc_open(int major, int minor, rtc_fd *fd) { | ||
| return 0; | ||
| } | ||
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| static int rtc_close(rtc_fd *fd) { | ||
| return 0; | ||
| } | ||
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| #define RTC_RD_TIME 0x80247009 // Example definition, adjust as necessary | ||
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| static ssize_t rtc_ioctl_size(int cmd) { | ||
| switch (cmd) { | ||
| case RTC_RD_TIME: | ||
| return sizeof(rtc_time); | ||
| } | ||
| return -1; | ||
| } | ||
|
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| // Function to handle ioctl operations | ||
| static int rtc_ioctl(struct fd *fd, int cmd, void *arg) { | ||
| @autoreleasepool { | ||
| switch (cmd) { | ||
| case RTC_RD_TIME: { // On a real Linux, there are a number of other possible ioctl()'s. We don't really need them | ||
| size_t length = 0; | ||
| rtc_time *data = get_current_time(fd, &length); | ||
|
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| if (arg == NULL) { | ||
| return _EFAULT; // Null pointer argument | ||
| } | ||
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| *(rtc_time *) arg = *data; // This is the magic that gets the value back to the "kernel" | ||
|
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| return 0; // Success | ||
| } | ||
| default: | ||
| return _EFAULT; // Oops | ||
| } | ||
| } | ||
| } | ||
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| struct dev_ops rtc_dev = { | ||
| .open = rtc_open, | ||
| .fd.read = rtc_read, | ||
| .fd.poll = rtc_poll, | ||
| .fd.close = rtc_close, | ||
| .fd.ioctl = rtc_ioctl, | ||
| .fd.ioctl_size = rtc_ioctl_size, // Do NOT FORGET THIS if you want to implement ioctl(s) for your device. They will not work without it. | ||
| }; |
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