Added CMOS time read function, Added cariage return support to kterm
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@ -62,15 +62,17 @@ void kterm_scrollup(){
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}
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void kterm_put (char c) {
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if(++kterm_column == VGA_WIDTH || c == '\n' ) {
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kterm_column = 0;
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if(kterm_row == VGA_HEIGHT-1) {
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if(kterm_row == VGA_HEIGHT-1 ) {
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kterm_scrollup();
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} else {
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kterm_row ++;
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}
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}
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if ( c == '\r'){
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kterm_column = 0;
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return;
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}
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if(c == '\n') return;
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@ -89,3 +91,100 @@ void kterm_writestring(const char* data ){
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AS_KERNEL();
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kterm_write(data, strlen(data));
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}
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static void itoa (char *buf, int base, int d) {
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char *p = buf;
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char *p1, *p2;
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unsigned long ud = d;
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int divisor = 10;
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if ( base == 'd' && d < 0){
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*p++ = '-';
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buf++;
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ud = -d;
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} else if (base == 'x'){
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divisor = 16;
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}
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do {
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int remainder = ud % divisor;
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*p++ = (remainder < 10 ) ? remainder + '0' : remainder + 'a' -10;
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} while(ud /= divisor);
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/*terminate buf*/
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*p =0;
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p1 = buf;
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p2 = p -1;
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while (p1 < p2)
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{
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char tmp = *p1;
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*p1 = *p2;
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*p2 = tmp;
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p1++;
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p2--;
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}
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}
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void printf ( const char *format, ...) {
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char **arg = (char **)&format;
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int c;
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char buf[20];
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arg++;
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while ((c = *format++) != 0){
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if( c != '%')
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kterm_put(c);
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else{
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char *p, *p2;
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int pad0 = 0, pad = 0;
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c = *format++;
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if(c =='0'){
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pad0 = 1;
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c = *format++;
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}
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if ( c >= '0' && c <= '9'){
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pad = c - '0';
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c = *format++;
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}
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switch (c)
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{
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case 'd':
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case 'u':
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case 'x':
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itoa(buf, c, *((int *) arg++));
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p = buf;
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goto string;
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break;
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case 's':
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p = *arg++;
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if(!p)
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p = "(null)";
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string:
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for (p2 = p; *p2; p2++);
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for (; p2 < p + pad; p2++)
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kterm_put(pad0 ? '0': ' ');
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while (*p)
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kterm_put(*p++);
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break;
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default:
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kterm_put(*((int *)arg++));
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break;
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}
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}
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}
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}
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@ -15,10 +15,16 @@ void kterm_putat(char, uint8_t, size_t, size_t);
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void kterm_put(char);
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void kterm_write(const char*, size_t);
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void kterm_writestring(const char*);
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void kterm_scrollup();
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void printf ( const char *format, ...);
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static void itoa (char *buf, int base, int d);
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#define KernelTag "[Kernel]: "
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#define AS_KERNEL() ( kterm_setcolor(VGA_COLOR_LIGHT_BLUE),\
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kterm_write(KernelTag, 10 ), \
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kterm_resetcolor())
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kterm_resetcolor())
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151
src/kernel/time.h
Normal file
151
src/kernel/time.h
Normal file
@ -0,0 +1,151 @@
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#define CURRENT_YEAR 2021 // Change this each year!
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int century_register = 0x00; // Set by ACPI table parsing code if possible
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unsigned char second;
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unsigned char minute;
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unsigned char hour;
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unsigned char day;
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unsigned char month;
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unsigned int year;
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enum {
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cmos_address = 0x70,
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cmos_data = 0x71
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};
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int get_update_in_progress_flag() {
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outb(cmos_address, 0x0A);
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return (inb(cmos_data) & 0x80);
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}
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unsigned char get_RTC_register(int reg) {
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outb(cmos_address, reg);
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return inb(cmos_data);
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}
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void read_rtc() {
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unsigned char century;
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unsigned char last_second;
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unsigned char last_minute;
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unsigned char last_hour;
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unsigned char last_day;
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unsigned char last_month;
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unsigned char last_year;
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unsigned char last_century;
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unsigned char registerB;
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// Note: This uses the "read registers until you get the same values twice in a row" technique
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// to avoid getting dodgy/inconsistent values due to RTC updates
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while (get_update_in_progress_flag()); // Make sure an update isn't in progress
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second = get_RTC_register(0x00);
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minute = get_RTC_register(0x02);
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hour = get_RTC_register(0x04);
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day = get_RTC_register(0x07);
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month = get_RTC_register(0x08);
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year = get_RTC_register(0x09);
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if(century_register != 0) {
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century = get_RTC_register(century_register);
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}
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do {
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last_second = second;
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last_minute = minute;
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last_hour = hour;
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last_day = day;
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last_month = month;
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last_year = year;
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last_century = century;
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while (get_update_in_progress_flag()); // Make sure an update isn't in progress
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second = get_RTC_register(0x00);
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minute = get_RTC_register(0x02);
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hour = get_RTC_register(0x04);
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day = get_RTC_register(0x07);
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month = get_RTC_register(0x08);
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year = get_RTC_register(0x09);
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if(century_register != 0) {
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century = get_RTC_register(century_register);
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}
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} while( (last_second != second) || (last_minute != minute) || (last_hour != hour) ||
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(last_day != day) || (last_month != month) || (last_year != year) ||
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(last_century != century) );
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registerB = get_RTC_register(0x0B);
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// Convert BCD to binary values if necessary
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if (!(registerB & 0x04)) {
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second = (second & 0x0F) + ((second / 16) * 10);
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minute = (minute & 0x0F) + ((minute / 16) * 10);
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hour = ( (hour & 0x0F) + (((hour & 0x70) / 16) * 10) ) | (hour & 0x80);
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day = (day & 0x0F) + ((day / 16) * 10);
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month = (month & 0x0F) + ((month / 16) * 10);
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year = (year & 0x0F) + ((year / 16) * 10);
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if(century_register != 0) {
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century = (century & 0x0F) + ((century / 16) * 10);
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}
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}
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// Convert 12 hour clock to 24 hour clock if necessary
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if (!(registerB & 0x02) && (hour & 0x80)) {
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hour = ((hour & 0x7F) + 12) % 24;
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}
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// Calculate the full (4-digit) year
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if(century_register != 0) {
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year += century * 100;
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} else {
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year += (CURRENT_YEAR / 100) * 100;
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if(year < CURRENT_YEAR) year += 100;
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}
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}
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/*
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void ReadFromCMOS(unsigned char array[])
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{
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unsigned char tvalue, index;
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for (index = 0; index < 128; index++)
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{
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asm(
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"cli\n\t" // Disable interrupts
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"mov al, index\n\t" // Move index address
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// since the 0x80 bit of al is not set, NMI is active
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"out 0x70,al\n\t" // Copy address to CMOS register
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// some kind of real delay here is probably best
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"in al,0x71\n\t" // Fetch 1 byte to al
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"sti\n\t" // Enable interrupts
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"mov tvalue,al\n\t");
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array[index] = tvalue;
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}
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}
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*/
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/*
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void WriteTOCMOS(unsigned char array[])
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{
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unsigned char index;
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for(index = 0; index < 128; index++)
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{
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unsigned char tvalue = array[index];
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asm("cli\n\t" // Clear interrupts
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"mov al,index\n\t" // move index address
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"out 0x70,al\n\t" // copy address to CMOS register
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/* some kind of real delay here is probably best
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"mov al,tvalue\n\t" // move value to al
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"out 0x71,al\n\t" // write 1 byte to CMOS
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"sti\n\\t" ); // Enable interrupts
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}
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}
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*/
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