From 506f1691f1ca7b562d82ab6f2280b87d0e4af84c Mon Sep 17 00:00:00 2001
From: James Barnett <noreply@jamesbarnett.xyz>
Date: Sat, 25 May 2019 20:11:52 +0100
Subject: Add keyboard support

---
 kernel/kernel-bootstrap.asm | 45 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 43 insertions(+), 2 deletions(-)

(limited to 'kernel/kernel-bootstrap.asm')

diff --git a/kernel/kernel-bootstrap.asm b/kernel/kernel-bootstrap.asm
index 9e3b10e..8af3565 100644
--- a/kernel/kernel-bootstrap.asm
+++ b/kernel/kernel-bootstrap.asm
@@ -7,12 +7,53 @@ dd 0x1BADB002
 dd 0x00
 dd - (0x1BADB002 + 0x00)  ; checksum
 
+global flush_gdt
+global read_port
+global write_port
+global load_idt
+global keyboard_handler
 global start
+
 extern kernel_entrypoint
+extern handle_keypress
+extern gdt_pointer
+
+flush_gdt:
+	lgdt [gdt_pointer]
+	mov ax, 0x10
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	mov ss, ax
+	jmp 0x08:flush
+flush:
+  ret
+
+read_port:
+	mov edx, [esp + 4]
+	in al, dx	
+	ret
+
+write_port:
+	mov edx, [esp + 4]    
+	mov al, [esp + 4 + 4]  
+	out dx, al  
+	ret
+
+load_idt:
+	mov edx, [esp + 4]
+	lidt [edx]
+	sti
+	ret
+
+keyboard_handler:                 
+	call handle_keypress
+	iretd
+
 
-                          ; call kernel and halt
 start:
-  cli                     ; disable interrups
+  cli
   mov esp, stack_space
   call kernel_entrypoint
   hlt
-- 
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