X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=3sys;a=blobdiff_plain;f=sys1%2Fkern%2Fsrc%2Fmem.c;fp=sys1%2Fkern%2Fsrc%2Fmem.c;h=898ef3f8a6ae31d0ff80e69cb997a268e13937ba;hp=0000000000000000000000000000000000000000;hb=0d2d1730817f3ef5fc766149f2598480094cbae8;hpb=6ccd3a47d05be145256a79a1de100f01ebd16a79

diff --git a/sys1/kern/src/mem.c b/sys1/kern/src/mem.c
new file mode 100644
index 0000000..898ef3f
--- /dev/null
+++ b/sys1/kern/src/mem.c
@@ -0,0 +1,22 @@
+#include "mem.h"
+#include "desc.h"
+
+void set_gdt(void *addr, uint16_t limit);
+
+enum {
+	SEG_NULL	= 0,
+	SEG_KCODE	= 1,
+	SEG_KDATA	= 2
+};
+
+#define NUM_SEG		3
+static struct desc gdt[NUM_SEG] __attribute__((aligned(8)));
+
+void mem_init(void)
+{
+	desc_seg(gdt, SEG_NULL, 0, 0, 0);
+	desc_seg(gdt + SEG_KCODE, SEG_CODE, 0, 0xffffffff, 0);
+	desc_seg(gdt + SEG_KDATA, SEG_DATA, 0, 0xffffffff, 0);
+
+	set_gdt(gdt, sizeof gdt - 1);
+}