Move TSS load to boot.s

src/kernel/arch/x86/boot.s

@@ -63,6 +63,9 @@ _start:
 
 	# GDT, paging, and other features
 	call gdt_install
+	# load the TSS which is in the 6th entry of the GDT
+	movw $0x28, %ax
+	ltr %ax
 
 boot_kernel:
 	# enter high-level kernel (C)

src/kernel/arch/x86/gdt.c

@@ -67,7 +67,4 @@ void gdt_install() {
 			sizeof(tss), 0x89, 0x40);
 
 	gdt_flush(&gdtr);
-
-	// load the TSS
-	tss_load();
 }

src/kernel/arch/x86/gdt.h

@@ -21,7 +21,6 @@
 #include "structs.h"
 
 extern void gdt_flush(struct segreg *gdtr);
-extern void tss_load();
 void gdt_entry_set(struct segdesc *entry, uint32_t base,
 		uint32_t limit, uint8_t access, uint8_t gran);
 void gdt_install();

src/kernel/arch/x86/gdt.s

@@ -35,13 +35,3 @@ gdt_flush:
 gdt_flush_end:
 	popl %ebp
 	ret
-
-.global tss_load
-.type tss_load,@function
-tss_load:
-	pushl %ebp
-	movl %esp, %ebp
-	movw $0x28, %ax
-	ltr %ax
-	popl %ebp
-	ret