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did some restructuring, got multitasking almost working

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slinky55
2026-06-26 20:05:01 -05:00
parent 57d7d34c6d
commit 43bc0df81a
35 changed files with 481 additions and 307 deletions
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86
kernel/interrupts.c
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@@ -1,23 +1,61 @@
#include "lib/print.h"
#include <stdint.h>
extern void send_eoi_master(void);
extern void send_eoi_slave(void);
extern uint8_t read_isr_master(void);
extern uint8_t read_isr_slave(void);
#include <lib/print.h>
extern uint8_t ps2_read_data();
#include "syscall.h"
struct registers {
#include <drivers/pic/pic.h>
#include <drivers/ps2/ps2.h>
#define IDT_MAX_DESCRIPTORS 256
#define ATTR_KERN_32 0x8E // active(1), ring 0 (00), interrupt gate(0), 32 bit (1110)
#define ATTR_USER_32 0xEE // active, ring 3, 32bit
#define SEGMENT_KERN 0x08
typedef struct __attribute__((packed)) {
uint16_t isr_low;
uint16_t selector;
uint8_t reserved;
uint8_t attributes;
uint16_t isr_high;
} idt_entry;
typedef struct __attribute__((packed)) {
uint16_t limit;
uint32_t base;
} idt_ptr;
typedef struct __attribute__((packed)) {
uint32_t edi, esi, ebp, esp_dummy, ebx, edx, ecx, eax;
uint32_t int_no;
uint32_t error_code;
uint32_t eip, cs, eflags, useresp, ss;
} registers;
extern void load_idt(void);
// isr stubs
extern void isr0();
extern void isr1();
extern void isr8();
extern void isr13();
extern void isr14();
extern void isr32();
extern void isr33();
static void* isr_stub_table[256] = {
[0] = isr0,
[1] = isr1,
[8] = isr8,
[13] = isr13,
[14] = isr14,
[32] = isr32,
[33] = isr33,
};
const char* err_messages[32] = {
static const char* err_messages[32] = {
[0] = "Divide by 0",
[1] = "",
[8] = "",
@@ -25,7 +63,37 @@ const char* err_messages[32] = {
[14] = "Page Fault",
};
void common_interrupt_handler(struct registers *args) {
idt_entry idt[IDT_MAX_DESCRIPTORS];
idt_ptr idtr;
static void set_idtr(uint8_t vector, void* isr, uint16_t sel, uint8_t attributes) {
idt_entry* desc = &idt[vector];
desc->isr_low = (uint32_t)isr & 0xFFFF;
desc->selector = SEGMENT_KERN;
desc->reserved = 0;
desc->attributes = attributes;
desc->isr_high = ((uint32_t)isr >> 16) & 0xFFFF;
}
void init_idt() {
idtr.limit = (sizeof(idt_entry) * IDT_MAX_DESCRIPTORS) - 1;
idtr.base = (uint32_t)&idt;
for (int i = 0; i < IDT_MAX_DESCRIPTORS; i++) {
if (isr_stub_table[i] != 0) {
set_idtr(i, isr_stub_table[i], SEGMENT_KERN, ATTR_KERN_32);
} else {
set_idtr(i, 0, SEGMENT_KERN, 0);
}
}
set_idtr(0x80, syscall_handler, SEGMENT_KERN, ATTR_USER_32);
load_idt();
}
void common_interrupt_handler(registers *args) {
switch (args->int_no) {
case 0:
case 1: