42 lines
1004 B
C
Executable File
42 lines
1004 B
C
Executable File
#include <kernel/utils.h>
|
|
|
|
struct idt_entry {
|
|
unsigned short base_low;
|
|
unsigned short selector;
|
|
unsigned char always0;
|
|
unsigned char flags;
|
|
unsigned short base_high;
|
|
} __attribute__((packed));
|
|
|
|
struct idt_ptr {
|
|
unsigned short limit;
|
|
unsigned int base;
|
|
}__attribute__((packed));
|
|
|
|
struct idt_entry idt[256]; // Interrupt table of 256 entries
|
|
struct idt_ptr idtp; // Pointer to idt table
|
|
|
|
extern void idt_load();
|
|
|
|
void idt_set_gate(unsigned char num, unsigned long base, unsigned short sel, unsigned char flags) {
|
|
idt[num].base_low = base & 0xFFFF;
|
|
idt[num].base_high = (base >> 16) & 0xFFFF;
|
|
|
|
idt[num].selector = sel;
|
|
idt[num].always0 = 0;
|
|
|
|
// Must be uncommented when we get to usermode - it sets the permission
|
|
// level to 3
|
|
idt[num].flags = flags; // | 0x60;
|
|
}
|
|
|
|
void idt_install() {
|
|
idtp.limit = (sizeof (struct idt_entry) * 256) - 1;
|
|
idtp.base = &idt;
|
|
|
|
memset(&idt, 0, sizeof(struct idt_entry) * 256);
|
|
|
|
// All ISRs go here
|
|
|
|
idt_load();
|
|
} |