gdt & tss

1 files changed, 40 insertions, 0 deletions

diff --git a/kernel/include/gdt.h b/kernel/include/gdt.h
new file mode 100644
index 0000000..4c84fe9
--- /dev/null
+++ b/kernel/include/gdt.h
@@ -0,0 +1,40 @@
+#ifndef GDT_H
+#define GDT_H
+
+#include <types.h>
+
+struct gdt_seg_entry {
+	uint16_t limit;
+	uint16_t offset1;
+	uint8_t offset2;
+	uint8_t access;
+	uint8_t limitflags;
+	uint8_t offset3;
+} __attribute__((packed));
+typedef struct gdt_seg_entry gdt_seg_entry;
+
+struct gdt_tss_entry {
+	uint16_t limit;
+	uint16_t offset1;
+	uint8_t offset2;
+	uint8_t access;
+	uint8_t limitflags;
+	uint8_t offset3;
+	uint32_t offset4;
+	uint32_t reserved;
+} __attribute__((packed));
+typedef struct gdt_tss_entry gdt_tss_entry;
+
+struct gdt_p {
+	uint16_t size;
+	uint64_t offset;
+} __attribute__((packed));
+typedef struct gdt_p gdt_p;
+
+void add_gdt_entry(uint32_t num, uint32_t offset, uint32_t limit, uint8_t access, uint8_t flags);
+void add_gdt_tss(uint32_t num, uint64_t offset, uint32_t limit, uint8_t access, uint8_t flags);
+void reload_gdt(void);
+void load_gdt(gdt_p* pointer);
+void init_gdt(void);
+
+#endif