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Added Real Time Clock. Time is now being shown at the top

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Tom-on
2024-05-08 16:54:25 +02:00
parent a97ac11d70
commit daa6d35045
5 changed files with 167 additions and 12 deletions
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Makefile
+9 -5
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@@ -25,10 +25,10 @@ filesystem: bootloader kernel $(C_FILES) $(FONTS)
@dd if=$(BUILD)/boot.bin of=kern.iso bs=512 seek=0 conv=notrunc status=none
@dd if=$(BUILD)/filetable.bin of=kern.iso bs=512 seek=5 conv=notrunc status=none
@dd if=$(BUILD)/kernel.bin of=kern.iso bs=512 seek=6 conv=notrunc status=none
@dd if=$(BUILD)/term16n.bin of=kern.iso bs=512 seek=36 conv=notrunc status=none
@dd if=$(BUILD)/testfont.bin of=kern.iso bs=512 seek=40 conv=notrunc status=none
@dd if=$(SRC)/fs/test.txt of=kern.iso bs=512 seek=44 conv=notrunc status=none
@dd if=$(BUILD)/calc.bin of=kern.iso bs=512 seek=45 conv=notrunc status=none
@dd if=$(BUILD)/term16n.bin of=kern.iso bs=512 seek=46 conv=notrunc status=none
@dd if=$(BUILD)/testfont.bin of=kern.iso bs=512 seek=50 conv=notrunc status=none
@dd if=$(SRC)/fs/test.txt of=kern.iso bs=512 seek=54 conv=notrunc status=none
@dd if=$(BUILD)/calc.bin of=kern.iso bs=512 seek=55 conv=notrunc status=none
$(BUILD):
@[ -d $(BUILD) ] || mkdir $(BUILD)
@@ -63,7 +63,11 @@ $(FONTS):
# Run QEMU
run:
qemu-system-x86_64 -drive format=raw,file="./kern.iso",index=0,media=disk -m 256M -accel tcg
qemu-system-x86_64\
-drive format=raw,file="./kern.iso",index=0,media=disk\
-m 256M\
-accel tcg\
-rtc base=localtime,clock=host,driftfix=slew
# Clean all build files
clean:
include/interrupt/rtc.h
+148
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@@ -0,0 +1,148 @@
#ifndef RTC_H
#define RTC_H
#include <interrupt/pic.h>
#include <interrupt/idt.h>
#include <screen/text.h>
#include <stdbool.h>
#include <string.h>
#define CMOS_ADDRESS 0x70
#define CMOS_DATA 0x71
typedef struct {
uint8_t second;
uint8_t minute;
uint8_t hour;
uint8_t day;
uint8_t month;
uint16_t year;
} __attribute__ ((packed)) datetime_t;
static datetime_t* datetime = (datetime_t*)0x2000; // TODO: Put this at a constant address in memory
bool cmosUpdateProgress() {
outb(CMOS_ADDRESS, 0x8a); // Read status reg A, disable NMI
return inb(CMOS_DATA) & 0x80;
}
uint8_t getRtcRegister(uint8_t reg) {
outb(CMOS_ADDRESS, reg | 0x80); // Disable NMI when sending
return inb(CMOS_DATA);
}
void enableRtc() {
uint8_t regB = getRtcRegister(0x0b);
outb(CMOS_ADDRESS, 0x8b);
outb(CMOS_DATA, regB | 0x40); // Set bit 6 - periodic int at 1024Hz
getRtcRegister(0x0c); // Clear pending interrupts
}
void disableRtc() {
__asm__ volatile ("cli");
uint8_t regB = getRtcRegister(0x0b);
outb(CMOS_ADDRESS, 0x8b);
outb(CMOS_DATA, regB & 0xbf); // Clear bit 6
__asm__ volatile ("sti");
}
__attribute__ ((interrupt)) void rtcHandler(intFrame_t* iframe) {
datetime_t newDatetime, oldDatetime;
static uint16_t rtcTicks = 0;
__asm__ volatile ("cli");
rtcTicks++;
if (rtcTicks % 1024 == 0) { // 1 Second has passed
while (cmosUpdateProgress()); // Wait
newDatetime.second = getRtcRegister(0);
newDatetime.minute = getRtcRegister(2);
newDatetime.hour = getRtcRegister(4);
newDatetime.day = getRtcRegister(7);
newDatetime.month = getRtcRegister(8);
newDatetime.year = getRtcRegister(9);
do {
oldDatetime = newDatetime;
while (cmosUpdateProgress()); // Wait
newDatetime.second = getRtcRegister(0);
newDatetime.minute = getRtcRegister(2);
newDatetime.hour = getRtcRegister(4);
newDatetime.day = getRtcRegister(7);
newDatetime.month = getRtcRegister(8);
newDatetime.year = getRtcRegister(9);
} while (
newDatetime.second != oldDatetime.second ||
newDatetime.minute != oldDatetime.minute ||
newDatetime.hour != oldDatetime.hour ||
newDatetime.day != oldDatetime.day ||
newDatetime.month != oldDatetime.month ||
newDatetime.year != oldDatetime.year
);
uint8_t regB = getRtcRegister(0x0b);
if (!(regB & 0x04)) {
newDatetime.second = (newDatetime.second & 0x0f) + ((newDatetime.second >> 4) * 10);
newDatetime.minute = (newDatetime.minute & 0x0f) + ((newDatetime.minute >> 4) * 10);
newDatetime.hour = ((newDatetime.hour & 0x0f) + (((newDatetime.hour & 0x70) >> 4) * 10)) | (newDatetime.hour * 0x80); // 12/24 Hour format bs
newDatetime.day = (newDatetime.day & 0x0f) + ((newDatetime.day >> 4) * 10);
newDatetime.month = (newDatetime.month & 0x0f) + ((newDatetime.month >> 4) * 10);
newDatetime.year = (newDatetime.year & 0x0f) + ((newDatetime.year >> 4) * 10);
}
// Convert 12 to 14 hour format
if (!(regB & 0x02) && (newDatetime.hour & 0x80)) {
newDatetime.hour = ((newDatetime.hour & 0x7f) + 12) % 24;
}
newDatetime.year += 2000; // Add current century
//*datetime = newDatetime;
datetime->second = newDatetime.second;
datetime->minute = newDatetime.minute;
datetime->hour = newDatetime.hour;
datetime->day = newDatetime.day;
datetime->month = newDatetime.month;
datetime->year = newDatetime.year;
if (true) { // TODO: Probably get rid of this idk
char buf[20] = { 0 }; // "12/12 2012 12:12:12" - Max string 20 chars with null byte
strcat(buf, itoa(datetime->day, 10));
strcat(buf, "/");
strcat(buf, itoa(datetime->month, 10));
strcat(buf, " ");
strcat(buf, itoa(datetime->year, 10));
strcat(buf, " ");
strcat(buf, itoa(datetime->hour, 10));
strcat(buf, ":");
strcat(buf, itoa(datetime->minute, 10));
strcat(buf, ":");
strcat(buf, itoa(datetime->second, 10));
printAt(" ", 30, 0);
bgColor = 0x0027323f;
fgColor = 0x00ededed;
printAt(buf, 30, 0);
bgColor = BG_COLOR;
fgColor = FG_COLOR;
}
}
getRtcRegister(0x0c);
sendPicEOI(8);
__asm__ volatile ("sti");
}
void setupRtc() { // IRQ 8 - Real Time Clock
idtSetGate(0x28, rtcHandler, INT_GATE_FLAGS);
unsetIrqMask(8);
enableRtc();
}
#endif
src/filetable.asm
+5 -5
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@@ -12,11 +12,11 @@
filetable:
db "boot",0,0,0,0,0,0, "bin",0,0,5
db "filetable",0, "tab",0,5,1
db "kernel",0,0,0,0, "bin",0,6,30
db "term16n",0,0,0, "fnt",0,36,4
db "testfont",0,0, "fnt",0,40,4
db "test",0,0,0,0,0,0, "txt",0,44,1
db "calc",0,0,0,0,0,0, "bin",0,45,2
db "kernel",0,0,0,0, "bin",0,6,40
db "term16n",0,0,0, "fnt",0,46,4
db "testfont",0,0, "fnt",0,50,4
db "test",0,0,0,0,0,0, "txt",0,54,1
db "calc",0,0,0,0,0,0, "bin",0,55,2
times 512-($-$$) db 0
src/kernel.c
+4 -1
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@@ -10,6 +10,7 @@
#include <screen/graphics.h>
#include <keyboard/keyboard.h>
#include <interrupt/pit.h>
#include <interrupt/rtc.h>
#include <time.h>
#define PROMPT "#> "
@@ -39,7 +40,7 @@ void main() {
deinitMemoryRegion(memmapAddr, maxBlocks / BLOCKS_PER_BYTE);
// TODO: Find font in filetable
diskRead(36, 4, font); // Read font from disk
diskRead(46, 4, font); // Read font from disk
clear();
print("kern.\n\n");
@@ -52,9 +53,11 @@ void main() {
idtSetGate(0x80, syscallHandler, USR_INT_GAME_FLAGS); // Setup Syscall handler in IDT for int 0x80
disableIrqs();
remapPic();
unsetIrqMask(2); // Enable PIC 2 line
__asm__ volatile ("sti");
setupTimer();
setupRtc();
setupKeyboard();
// Run Interactive Shell Program
src/stage1.asm
+1 -1
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@@ -4,7 +4,7 @@
%define VIDMEM 0xb800
%define FILETAB_LOC 0x7000 ; TODO: Read kernel size and location from ft
%define KERNEL_SIZE 30 ; 15kB
%define KERNEL_SIZE 40 ; 20kB
start:
mov [driveNum], dl ; Store the drive number