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This commit is contained in:
David Goeke
2025-05-28 14:41:02 -05:00
commit 6d366537dd
73 changed files with 4448 additions and 0 deletions
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drivers/idt.c Normal file
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#include <string.h>
#include <port_io.h>
#include <idt.h>
#define IDT_ENTRIES 256
struct idt_entry idt[IDT_ENTRIES];
struct idt_ptr idtp;
extern void idt_load(uint32_t);
void idt_install(void)
{
idtp.limit = sizeof(struct idt_entry) * IDT_ENTRIES - 1;
idtp.base = (uint32_t)&idt;
memset(&idt, 0, sizeof(struct idt_entry) * IDT_ENTRIES);
/* Set entries for IRQs/ISRs here using `idt_set_entry(...)` */
/* Example: idt_set_entry(0, (uint32_t)isr0, 0x08, 0x8E); */
idt_load((uint32_t)&idtp);
}
void pic_remap(void)
{
outb(0x20, 0x11); /* Start init for master PIC */
outb(0xA0, 0x11); /* Start init for slave PIC */
outb(0x21, 0x20); /* Master PIC vector offset */
outb(0xA1, 0x28); /* Slave PIC vector offset */
outb(0x21, 0x04); /* Tell Master PIC about Slave PIC at IRQ2 */
outb(0xA1, 0x02); /* Tell Slave PIC its cascade identity */
outb(0x21, 0x01); /* 8086/88 mode */
outb(0xA1, 0x01);
outb(0x21, 0x0); /* Unmask master */
outb(0xA1, 0x0); /* Unmask slave */
}
void idt_set_entry(int num, uint32_t base, uint16_t sel, uint8_t flags)
{
idt[num].base_low = base & 0xFFFF;
idt[num].base_high = (base >> 16) & 0xFFFF;
idt[num].sel = sel;
idt[num].always0 = 0;
idt[num].flags = flags;
}
extern void IRQ0_handler(void);
extern void isr0(void);
extern void isr1(void);
extern void isr2(void);
extern void isr3(void);
extern void isr4(void);
extern void isr5(void);
extern void isr6(void);
extern void isr7(void);
extern void isr8(void);
extern void isr9(void);
extern void isr10(void);
extern void isr11(void);
extern void isr12(void);
extern void isr13(void);
extern void isr14(void);
extern void isr15(void);
extern void isr16(void);
extern void isr17(void);
extern void isr18(void);
extern void isr19(void);
extern void isr20(void);
extern void isr21(void);
extern void isr22(void);
extern void isr23(void);
extern void isr24(void);
extern void isr25(void);
extern void isr26(void);
extern void isr27(void);
extern void isr28(void);
extern void isr29(void);
extern void isr30(void);
extern void isr31(void);
extern void isr33(void);
extern void isr128(void);
void idt_install_isrs(void)
{
idt_set_entry(0, (uint32_t)isr0, 0x08, 0x8E);
idt_set_entry(1, (uint32_t)isr1, 0x08, 0x8E);
idt_set_entry(2, (uint32_t)isr2, 0x08, 0x8E);
idt_set_entry(3, (uint32_t)isr3, 0x08, 0x8E);
idt_set_entry(4, (uint32_t)isr4, 0x08, 0x8E);
idt_set_entry(5, (uint32_t)isr5, 0x08, 0x8E);
idt_set_entry(6, (uint32_t)isr6, 0x08, 0x8E);
idt_set_entry(7, (uint32_t)isr7, 0x08, 0x8E);
idt_set_entry(8, (uint32_t)isr8, 0x08, 0x8E);
idt_set_entry(9, (uint32_t)isr9, 0x08, 0x8E);
idt_set_entry(10, (uint32_t)isr10, 0x08, 0x8E);
idt_set_entry(11, (uint32_t)isr11, 0x08, 0x8E);
idt_set_entry(12, (uint32_t)isr12, 0x08, 0x8E);
idt_set_entry(13, (uint32_t)isr13, 0x08, 0x8E);
idt_set_entry(14, (uint32_t)isr14, 0x08, 0x8E);
idt_set_entry(15, (uint32_t)isr15, 0x08, 0x8E);
idt_set_entry(16, (uint32_t)isr16, 0x08, 0x8E);
idt_set_entry(17, (uint32_t)isr17, 0x08, 0x8E);
idt_set_entry(18, (uint32_t)isr18, 0x08, 0x8E);
idt_set_entry(19, (uint32_t)isr19, 0x08, 0x8E);
idt_set_entry(20, (uint32_t)isr20, 0x08, 0x8E);
idt_set_entry(21, (uint32_t)isr21, 0x08, 0x8E);
idt_set_entry(22, (uint32_t)isr22, 0x08, 0x8E);
idt_set_entry(23, (uint32_t)isr23, 0x08, 0x8E);
idt_set_entry(24, (uint32_t)isr24, 0x08, 0x8E);
idt_set_entry(25, (uint32_t)isr25, 0x08, 0x8E);
idt_set_entry(26, (uint32_t)isr26, 0x08, 0x8E);
idt_set_entry(27, (uint32_t)isr27, 0x08, 0x8E);
idt_set_entry(28, (uint32_t)isr28, 0x08, 0x8E);
idt_set_entry(29, (uint32_t)isr29, 0x08, 0x8E);
idt_set_entry(30, (uint32_t)isr30, 0x08, 0x8E);
idt_set_entry(31, (uint32_t)isr31, 0x08, 0x8E);
idt_set_entry(33, (uint32_t)isr33, 0x08, 0x8E);
}
void idt_install_syscall(void)
{
idt_set_entry(128, (uint32_t)isr128, 0x08, 0xEE);
}