initial commit. working on tasking

1 files changed, 48 insertions, 0 deletions

diff --git a/arch/x86_64/hal/gdt.h b/arch/x86_64/hal/gdt.h
new file mode 100644
index 0000000..7fb7dfc
--- /dev/null
+++ b/arch/x86_64/hal/gdt.h
@@ -0,0 +1,48 @@
+#ifndef _JOVE_x86_64_HAL_GDT_H
+#define _JOVE_x86_64_HAL_GDT_H 1
+
+#include <stddef.h>
+#include <stdint.h>
+#include "jove.h"
+
+enum {
+    GDT_KERNEL_NULL = 0,
+    GDT_KERNEL_CODE,
+    GDT_KERNEL_DATA,
+    GDT_USER_NULL,
+    GDT_USER_DATA,
+    GDT_USER_CODE,
+    GDT_TSS_LO,
+    GDT_TSS_HI
+};
+
+#define GDT_OFFSET(i) (i << 3)
+
+struct gdt_entry
+{
+    uint16_t limit_0_15;
+    uint16_t base_0_15;
+    uint8_t base_16_23;
+    uint8_t type_flg;
+    uint8_t limit_flg;
+    uint8_t base_24_31;
+};
+
+struct tss
+{
+    uint32_t rsv0;
+    uint64_t rsp[3];
+    uint64_t rsv1;
+    uint64_t ist[7];
+    uint64_t rsv2;
+    uint16_t rsv3;
+    uint16_t iopb;
+} PACKED;
+
+struct gdt_descriptor
+{
+    uint16_t limit;
+    uint64_t base;
+} PACKED;
+
+#endif