Let compiler select register when loading GDT

phil-opp · phil-opp · commit b00bf342c9db · 2022-09-10T12:20:16.000+02:00
diff --git a/bios/stage-2/src/protected_mode.rs b/bios/stage-2/src/protected_mode.rs
@@ -74,7 +74,7 @@ pub fn enter_unreal_mode() {
 
     // load GDT
     unsafe {
-        asm!("mov bx, 0x10", "mov ds, bx");
+        asm!("mov {0}, 0x10", "mov ds, {0}", out(reg) _);
     }
 
     // unset protected mode bit again

Original file line number	Diff line number	Diff line change
`@@ -74,7 +74,7 @@ pub fn enter_unreal_mode() {`
`74`	`74`
`75`	`75`	`// load GDT`
`76`	`76`	`unsafe {`
`77`		`- asm!("mov bx, 0x10", "mov ds, bx");`
	`77`	`+ asm!("mov {0}, 0x10", "mov ds, {0}", out(reg) _);`
`78`	`78`	`}`
`79`	`79`
`80`	`80`	`// unset protected mode bit again`