x86_64: pmap: enable NX protection during bootstrap

2023-02-09 21:38:06 +00:00
parent ddb00acd31
commit d960909d1b
3 changed files with 14 additions and 0 deletions
--- a/arch/x86_64/pmap_ctrl.S
+++ b/arch/x86_64/pmap_ctrl.S
@@ -29,3 +29,14 @@ gigabyte_pages:
 3:	pop %rbx
 	pop %rbp
 	ret
+
+	.global enable_nx
+	.type enable_nx, @function
+
+enable_nx:
+	mov $0xC0000080, %ecx
+	rdmsr
+	or $0x800, %eax
+	wrmsr
+
+	ret