Changed to the based ASM syntax and implemented a rudementary GDT

1 files changed, 32 insertions, 0 deletions

diff --git a/src/include/gdt.h b/src/include/gdt.h
new file mode 100644
index 0000000..05f426e
--- /dev/null
+++ b/src/include/gdt.h
@@ -0,0 +1,32 @@
+#pragma once
+#include <stdint.h>
+#define FLAG 0b1100
+typedef struct Segment_Descriptor {
+    uint16_t lim_low;
+    uint16_t base_low;
+    uint8_t base_mid;
+    uint8_t access;
+    uint8_t lim_flag;
+    uint8_t base_high;
+} __attribute__((packed)) Segment_Descriptor_t;
+
+typedef struct GDTR {
+    uint16_t size;
+    uint32_t offset;
+} __attribute__((packed)) GDTR_t;
+
+typedef struct GDT {
+    Segment_Descriptor_t nulldesc;
+    Segment_Descriptor_t codedesc;
+    Segment_Descriptor_t datadesc;
+} __attribute__((packed)) GDT_t;
+
+uint8_t make_access(uint8_t DPL, uint8_t type, uint8_t exec, uint8_t direction,
+                    uint8_t read_write);
+
+uint16_t make_code(uint8_t priv, uint8_t dc, uint8_t rw);
+uint16_t make_data(uint8_t priv, uint8_t dc, uint8_t rw);
+
+Segment_Descriptor_t make_descriptor(uint32_t base, uint32_t limit,
+                                     uint16_t access_flag);
+void get_gdtr();