1 files changed, 20 insertions, 0 deletions
diff --git a/i686/gdt.c b/i686/gdt.c
new file mode 100644
index 0000000..c0898f3
--- /dev/null
+++ b/i686/gdt.c
@@ -0,0 +1,20 @@
+#include "gdt.h"
+
+void
+SegmentDescriptor(struct SegmentDescriptor_t *self, unsigned base, unsigned limit, uint8_t access)
+{
+  self->base_15_0 = base & 0xffff;
+  self->base_23_16 = (base >> 16) & 0xff;
+  self->base_31_24 = (base >> 24) & 0xff;
+
+  self->limit_15_0 = (limit <= 0xffff) ? (limit & 0xffff) : ((limit >> 12) & 0xffff);
+  self->limit_19_16 = (limit <= 0xffff) ? 0 : ((limit >> 28) & 0xf);
+
+  self->access = access;
+
+  self->a = 0;
+  self->rsv = 0;
+  self->db = (limit > 0xffff) ? 1 : 0;
+  self->granularity = (limit > 0) ? 1 : 0;
+}
+