113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
#include <amd64/io.h>
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#include <amd64/rtc.h>
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#include <libk/std.h>
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#include <limine/requests.h>
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#include <sys/debug.h>
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#include <sys/spin.h>
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#include <sys/stall.h>
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#include <time.h>
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#include <uacpi/acpi.h>
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#include <uacpi/status.h>
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#include <uacpi/tables.h>
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#include <uacpi/uacpi.h>
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#define RTC_CMOS_ADDR 0x70
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#define RTC_CMOS_DATA 0x71
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static uint8_t rtc_century;
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#define RTC_SEC 0x00
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#define RTC_SEC_ALARM 0x01
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#define RTC_MIN 0x02
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#define RTC_MIN_ALARM 0x03
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#define RTC_HOUR 0x04
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#define RTC_HOUR_ALARM 0x05
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#define RTC_WEEK_DAY 0x06
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#define RTC_DAY 0x07
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#define RTC_MONTH 0x08
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#define RTC_YEAR 0x09
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#define RTC_REG_A 0x0A
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#define RTC_REG_B 0x0B
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#define RTC_REG_C 0x0C
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#define RTC_REG_D 0x0D
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#define RTC_REG_A_UIP (1 << 7)
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#define RTC_REG_B_HOURFMT (1 << 1)
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#define RTC_REG_B_DATAMODE (1 << 2)
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static uint8_t rtc_read (uint8_t addr) {
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outb (RTC_CMOS_ADDR, RTC_REG_A);
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while (inb (RTC_CMOS_DATA) & RTC_REG_A_UIP)
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;
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outb (RTC_CMOS_ADDR, addr);
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return inb (RTC_CMOS_DATA);
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}
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static void rtc_write (uint8_t addr, uint8_t value) {
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outb (RTC_CMOS_ADDR, addr);
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outb (RTC_CMOS_DATA, value);
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}
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static uint8_t rtc_bcd_to_bin (uint8_t value) { return (value & 0xF) + (value >> 4) * 10; }
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static uint8_t rtc_bin_to_bcd (uint8_t value) { return ((value / 10) << 4) + (value % 10); }
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void rtc_init (void) {
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struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
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struct uacpi_table fadt_table;
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uacpi_status status = uacpi_table_find_by_signature (ACPI_FADT_SIGNATURE, &fadt_table);
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if (status != UACPI_STATUS_OK) {
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DEBUG ("Could not find FADT table!\n");
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spin ();
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}
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struct acpi_fadt* fadt = (struct acpi_fadt*)fadt_table.virt_addr;
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rtc_century = fadt->century;
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}
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void rtc_date_time (struct date_time* date_time) {
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if (rtc_read (RTC_REG_A) & RTC_REG_A_UIP)
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stall_ms (1);
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uint8_t sec = rtc_read (RTC_SEC);
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uint8_t min = rtc_read (RTC_MIN);
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uint8_t hour = rtc_read (RTC_HOUR);
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uint8_t weekday = rtc_read (RTC_WEEK_DAY);
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uint8_t day = rtc_read (RTC_DAY);
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uint8_t month = rtc_read (RTC_MONTH);
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uint8_t year = rtc_read (RTC_YEAR);
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uint8_t century = rtc_century != 0 ? rtc_read (rtc_century) : 0;
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uint8_t b = rtc_read (RTC_REG_B);
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/* BCD */
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if ((~b) & RTC_REG_B_DATAMODE) {
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sec = rtc_bcd_to_bin (sec);
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min = rtc_bcd_to_bin (min);
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hour = rtc_bcd_to_bin (hour);
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day = rtc_bcd_to_bin (day);
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month = rtc_bcd_to_bin (month);
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year = rtc_bcd_to_bin (year);
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if (rtc_century != 0)
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century = rtc_bcd_to_bin (century);
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}
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weekday--;
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int full_year;
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if (rtc_century != 0)
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full_year = (century * 100) + year;
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else
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full_year = (year < 80) ? (2000 + year) : (1900 + year);
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date_time->sec = sec;
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date_time->min = min;
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date_time->hour = hour;
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date_time->day = day;
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date_time->weekday = weekday;
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date_time->month = month;
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date_time->year = full_year;
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}
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