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Refactoring assembly entry point

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Marco Cetica
2021-02-03 15:59:42 +01:00
parent dc3803491e
commit 1b207add8c
61 changed files with 4782 additions and 4779 deletions
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78
kernel/drivers/timer.c
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@@ -1,39 +1,39 @@
#include "timer.h"
#include "isr.h"
#include "tty.h"
#include "../libc/string.h"
#include "ports.h"
// Start tick at zero
uint32_t tick = 0;
static void timer_callback(registers_t regs) {
tick++;
/* uint8_t buf[8];
itoa(tick, buf, 10);
kprint((uint8_t*)"Time: ");
uitoa(tick, buf, 10);
kprint((uint8_t*)buf);
kprint((uint8_t*)"\n");*/
// Cast to void unused parameter
UNUSED_PAR(regs);
}
void init_timer(uint32_t frequency) {
// Register a new ISR for IRQ0
register_interrupt_handler(IRQ0, &timer_callback);
/* As mentioned before, we'll send to PIT a value to divide for
* his system clock(1.1931 MHz). We have to keep in mind that
* this value must fit into a 16 bits variable */
uint32_t divisor = 1193180 / frequency;
// Send command to the right port
outb(0x43, 0x36);
// The two divisor has to be sent byte-wise, to do this we split them in two parts
uint8_t low = (uint8_t)(divisor & 0xFF);
uint8_t high = (uint8_t)((divisor >> 8) & 0xFF);
// Send the frequency divisor
outb(0x40, low);
outb(0x40, high);
}
#include "timer.h"
#include "isr.h"
#include "tty.h"
#include "../libc/string.h"
#include "ports.h"
// Start tick at zero
uint32_t tick = 0;
static void timer_callback(registers_t regs) {
tick++;
/* uint8_t buf[8];
itoa(tick, buf, 10);
kprint((uint8_t*)"Time: ");
uitoa(tick, buf, 10);
kprint((uint8_t*)buf);
kprint((uint8_t*)"\n");*/
// Cast to void unused parameter
UNUSED_PAR(regs);
}
void init_timer(uint32_t frequency) {
// Register a new ISR for IRQ0
register_interrupt_handler(IRQ0, &timer_callback);
/* As mentioned before, we'll send to PIT a value to divide for
* his system clock(1.1931 MHz). We have to keep in mind that
* this value must fit into a 16 bits variable */
uint32_t divisor = 1193180 / frequency;
// Send command to the right port
outb(0x43, 0x36);
// The two divisor has to be sent byte-wise, to do this we split them in two parts
uint8_t low = (uint8_t)(divisor & 0xFF);
uint8_t high = (uint8_t)((divisor >> 8) & 0xFF);
// Send the frequency divisor
outb(0x40, low);
outb(0x40, high);
}