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[ BIG CHANGE ] Properly Implemented IDT

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- New include files: idt.h, pic.h, syscall.h and exceptions.h
- Proper exception handling (still could be improved
- PIC properly initiated and irqs all masked
- BREAKS Keyboard - The keyboard IRQ is not handled anymore
- convertColor() is kinda broken :/ (More in README.md)
This commit is contained in:
Tom-on
2024-05-05 21:03:21 +02:00
parent 29418eb46b
commit 1d71a4e384
15 changed files with 448 additions and 617 deletions
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include/idt.h
+30 -24
View File
@@ -2,48 +2,54 @@
#define IDT_H
#include "stdint.h"
#include "system.h"
#include "screen.h"
struct idtEntry {
#define TRAP_GATE_FLAGS 0x8f // P = 1, DPL = 00, S = 0, Type = 1111 (32-bit Trap gate)
#define INT_GATE_FLAGS 0x8e // P = 1, DPL = 00, S = 0, Type = 1110 (32-bit Int gate)
#define USR_INT_GAME_FLAGS 0xee // P = 1, DPL = 11, S = 0, Type = 1110 (32-bit Int gate)
typedef struct {
uint16_t offsetLow;
uint16_t selector;
uint8_t zero;
uint8_t typeAttr;
uint16_t offsetHigh;
} __attribute__((packed));
} __attribute__ ((packed)) idtEntry_t;
struct idtPointer {
typedef struct {
uint16_t limit;
uint32_t base;
} __attribute__((packed));
} __attribute__ ((packed)) idtp_t;
struct idtEntry idt[256] = { 0 };
struct idtPointer idtp;
typedef struct {
uint32_t eip;
uint32_t cs;
uint32_t eflags;
uint32_t esp;
uint32_t ss;
} __attribute__ ((packed)) intFrame_t;
extern void idtLoad();
__attribute__ ((aligned(0x10))) // For performance
idtEntry_t idt[256] = { 0 };
idtp_t idtp;
void idtSetGate(uint8_t i, uint32_t offset, uint16_t selector, uint8_t typeAttr) {
idt[i].offsetLow = (uint16_t)offset;
idt[i].selector = selector;
idt[i].zero = 0;
idt[i].typeAttr = typeAttr;
idt[i].offsetHigh = (uint16_t)(offset >> 16);
void idtSetGate(uint8_t i, void* handler, uint8_t flags) {
uint32_t offset = (uint32_t)handler;
idtEntry_t* entry = &idt[i];
entry->offsetLow = (uint16_t)offset;
entry->selector = 0x08;
entry->zero = 0;
entry->typeAttr = flags;
entry->offsetHigh = (uint16_t)(offset >> 16);
}
void setupIdt() {
idtp.limit = sizeof(struct idtEntry) * 256;
idtp.limit = sizeof(idtEntry_t) * 256;
idtp.base = (uint32_t)&idt;
idtLoad();
__asm__ volatile ("lidt %0" : : "m"(idtp));
}
// Contains values of registers and exception info from isrs
struct regs {
unsigned int gs, fs, es, ds;
unsigned int edi, esi, ebp, esp, ebx, edx, ecx, eax;
unsigned int intNo, errCode;
unsigned int eip, cs, eflags, useresp, ss;
};
#endif