Include file restructure!

- include/ now has subdirs - standard C headers will be in 'include/c'. Any program can include these - all other header shall only be used by the kernel
2024-05-07 21:01:50 +02:00
parent 41e0b93f52
commit 7826b9b7d4
20 changed files with 33 additions and 83 deletions
@@ -0,0 +1,55 @@
+#ifndef IDT_H
+#define IDT_H
+
+#include <stdint.h>
+#include <screen/text.h>
+
+#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)) idtEntry_t;
+
+typedef struct {
+    uint16_t limit;
+    uint32_t base;
+} __attribute__ ((packed)) idtp_t;
+
+typedef struct {
+    uint32_t eip;
+    uint32_t cs;
+    uint32_t eflags;
+    uint32_t esp;
+    uint32_t ss;
+} __attribute__ ((packed)) intFrame_t;
+
+__attribute__ ((aligned(0x10))) // For performance
+idtEntry_t idt[256] = { 0 };
+idtp_t idtp;
+
+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(idtEntry_t) * 256;
+    idtp.base = (uint32_t)&idt;
+
+    __asm__ volatile ("lidt %0" : : "m"(idtp));
+}
+
+#endif
+