From a8a80d326de9550b2a25b1255a2093ab43219ede Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Sat, 27 Jan 2024 23:14:29 -0500
Subject: keyboard input

---
 kernel/interrupts.asm | 96 ++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 91 insertions(+), 5 deletions(-)

(limited to 'kernel/interrupts.asm')

diff --git a/kernel/interrupts.asm b/kernel/interrupts.asm
index 4827cfd..c096ddb 100644
--- a/kernel/interrupts.asm
+++ b/kernel/interrupts.asm
@@ -220,27 +220,111 @@ gdt:
 .tss:
   dq 0x0000e90000000067
   dq 0;tss is 2 qwords wide
-  dq 0x00209b0000000000
-  dq 0x00009b0000000000
-  dq 0x0000fb0000000000
-  dq 0x0020fb0000000000
+  dq 0x002f98000000ffff
+  dq 0x002f92000000ffff
+  dq 0x002ff2000000ffff
+  dq 0x002ff8000000ffff
+
+section .bss
 
 section .text
 
+write_keyboard_byte:
+  in al, 0x64
+  test al, 0x02
+  jnz write_keyboard_byte
+  mov al, dil
+  out 0x60, al
+  ret
+
+extern on_keyboard_interrupt
+
+keyboard_isr:
+
+  push r11
+  push r10
+  push r9
+  push r8
+  push rsi
+  push rdi
+  push rdx
+  push rcx
+  push rax
+
+  in al, 0x60
+  mov dil, al
+
+  call on_keyboard_interrupt
+
+  mov al, 0x20
+  out 0x20, al
+
+  pop rax
+  pop rcx
+  pop rdx
+  pop rdi
+  pop rsi
+  pop r8
+  pop r9
+  pop r10
+  pop r11
+
+  iretq
+
 load_gdt_and_idt:
 
+  ;fill exception entries in idt
+
   mov rcx, 16
 
 .loop:
 
   mov rdi, rcx
   dec rdi
-  mov sil, 0
+  mov sil, 1
   mov rdx, qword [exception_isrs + rdi * 8]
   call set_isr
 
   loop .loop
 
+  ;reset pic and map irqs to 0x20 - 0x2f
+
+  mov al, 0x11
+  out 0x20, al
+  mov al, 0x20
+  out 0x21, al
+  mov al, 0x04
+  out 0x21, al
+  mov al, 0x01
+  out 0x21, al
+  mov al, 0xfd ;mask all but irq 1
+  out 0x21, al
+
+  mov al, 0x11
+  out 0xa0, al
+  mov al, 0x28
+  out 0xa1, al
+  mov al, 0x02
+  out 0xa1, al
+  mov al, 0x01
+  out 0xa1, al
+  mov al, 0xff ;mask all
+  out 0xa1, al
+
+  mov rdi, 0x21
+  xor sil, sil
+  mov rdx, keyboard_isr
+  call set_isr
+
+  ;set keyboard config
+
+  mov al, 0x60
+  out 0x64, al
+  mov dil, 0x01
+  call write_keyboard_byte
+
+  ;make tss entry in gdt
+
   mov rax, tss
 
   mov word [gdt.tss + 2], ax
@@ -250,6 +334,8 @@ load_gdt_and_idt:
   shr rax, 16
   mov dword [gdt.tss + 8], eax
 
+  ;load gdt, idt, tss
+
   lgdt [gdtr]
   lidt [idtr]
   mov ax, 0x18
-- 
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