mirror of
https://github.com/gbowne1/ClassicOS.git
synced 2026-02-11 21:35:20 -08:00
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
#include "cmos.h"
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#include "io.h"
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#include "print.h"
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#define CMOS_ADDR 0x70
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#define CMOS_DATA 0x71
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enum {
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CMOS_SEC = 0x00,
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CMOS_MIN = 0x02,
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CMOS_HOUR = 0x04,
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CMOS_DAY = 0x07,
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CMOS_MONTH= 0x08,
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CMOS_YEAR = 0x09,
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CMOS_STAT_A = 0x0A,
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CMOS_STAT_B = 0x0B
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};
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// Check if CMOS is currently updating its values
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static int is_updating() {
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outb(CMOS_ADDR, CMOS_STAT_A);
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return (inb(CMOS_DATA) & 0x80);
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}
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static uint8_t get_register(int reg) {
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outb(CMOS_ADDR, reg);
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return inb(CMOS_DATA);
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}
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void cmos_read_time(cmos_time_t* time) {
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// Wait for any current update to finish
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while (is_updating());
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uint8_t sec = get_register(CMOS_SEC);
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uint8_t min = get_register(CMOS_MIN);
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uint8_t hour = get_register(CMOS_HOUR);
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uint8_t day = get_register(CMOS_DAY);
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uint8_t month = get_register(CMOS_MONTH);
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uint8_t year = get_register(CMOS_YEAR);
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uint8_t statb = get_register(CMOS_STAT_B);
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// If Bit 2 of Status Register B is 0, then values are BCD
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if (!(statb & 0x04)) {
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time->second = (sec & 0x0F) + ((sec / 16) * 10);
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time->minute = (min & 0x0F) + ((min / 16) * 10);
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time->hour = ((hour & 0x0F) + (((hour & 0x70) / 16) * 10)) | (hour & 0x80);
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time->day = (day & 0x0F) + ((day / 16) * 10);
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time->month = (month & 0x0F) + ((month / 16) * 10);
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time->year = (year & 0x0F) + ((year / 16) * 10);
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} else {
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time->second = sec;
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time->minute = min;
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time->hour = hour;
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time->day = day;
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time->month = month;
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time->year = year;
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}
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// Adjust for Century (assuming we are in the 2000s for ClassicOS)
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time->year += 2000;
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}
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void cmos_print_time(cmos_time_t* time) {
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// Using your print_string/itoa style logic
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char buf[16];
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print_string("System Time: ");
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// Simple padding check for minutes
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print_hex(time->hour, 0, 1);
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print_string(":");
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if (time->minute < 10) print_string("0");
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print_hex(time->minute, 0, 1);
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print_string(":");
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if (time->second < 10) print_string("0");
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print_hex(time->second, 0, 1);
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print_string(" ");
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print_hex(time->month, 0, 1);
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print_string("/");
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print_hex(time->day, 0, 1);
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print_string("/");
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print_hex(time->year, 0, 1);
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print_string("\n");
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}
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