hw_x86_64: Set segment registers prior to mode transition

The registers for the ds, es, fs and gs segments are hardcoded to GDT index 4 with requested privilege level set to 3.
2015-02-18 00:30:14 +01:00 · 2015-02-18 00:30:14 +01:00 · 60e799f7b4
parent fe22858550
commit 60e799f7b4
1 changed files with 7 additions and 0 deletions
--- a/repos/base-hw/src/core/spec/x86_64/mode_transition.s
+++ b/repos/base-hw/src/core/spec/x86_64/mode_transition.s
@ -90,6 +90,13 @@
 	pushq $0x1b
 	pushq (%rax)

+	/* Restore segment registers */
+	mov $0x23, %rbx
+	mov %rbx, %ds
+	mov %rbx, %es
+	mov %rbx, %fs
+	mov %rbx, %gs
+
 	1: jmp 1b

 	/* end of the mode transition code */