From 7498b41d94b2f34468833b55ad0472d75b63064e Mon Sep 17 00:00:00 2001
From: Danny Holman <dholman@gymli.xyz>
Date: Sat, 24 Jul 2021 02:27:40 -0500
Subject: arch: i386: add GDT setup routines

Add a set of routines that setup the x86's global descriptor table.

Signed-off-by: Danny Holman <dholman@gymli.xyz>
---
 arch/i386/boot/boot.s | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'arch/i386/boot/boot.s')

diff --git a/arch/i386/boot/boot.s b/arch/i386/boot/boot.s
index 792a790..842519f 100644
--- a/arch/i386/boot/boot.s
+++ b/arch/i386/boot/boot.s
@@ -68,8 +68,26 @@ _start:
 
         movl $stack_top, %esp
 
+        call tty_init
+        call gdt_install
         call kernel_main
 
         cli
 1:      hlt
         jmp 1b
+
+.global flush_gdt
+.type flush_gdt, @function
+
+flush_gdt:
+        cli
+        movl 4(%esp), %eax
+        lgdt (%eax)
+        movw $0x10, %ax
+        movw %ax, %ds
+        movw %ax, %es
+        movw %ax, %fs
+        movw %ax, %gs
+        movw %ax, %ss
+        jmp $0x08, $.flush
+.flush: ret
-- 
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