From e60fa7740cd7d245d1b22a25fea9df0768d32668 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Sun, 19 May 2024 04:34:40 -0400
Subject: mouse support (working in qemu, semi-working in virtualbox)

---
 kernel/source/interrupts.asm | 102 +++++++++++++++++++++++++++++++++++++------
 1 file changed, 89 insertions(+), 13 deletions(-)

(limited to 'kernel/source/interrupts.asm')

diff --git a/kernel/source/interrupts.asm b/kernel/source/interrupts.asm
index babc020..e0c3cdb 100644
--- a/kernel/source/interrupts.asm
+++ b/kernel/source/interrupts.asm
@@ -227,14 +227,6 @@ 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:
@@ -249,6 +241,7 @@ keyboard_isr:
   push rcx
   push rax
 
+  call wait_read_ps2
   in al, 0x60
   mov dil, al
 
@@ -269,6 +262,54 @@ keyboard_isr:
 
   iretq
 
+extern on_mouse_interrupt
+
+mouse_isr:
+
+  push r11
+  push r10
+  push r9
+  push r8
+  push rsi
+  push rdi
+  push rdx
+  push rcx
+  push rax
+
+  call wait_read_ps2
+  in al, 0x60
+  mov dil, al
+
+  call on_mouse_interrupt
+
+  mov al, 0x20
+  out 0x20, al
+  out 0xa0, al
+
+  pop rax
+  pop rcx
+  pop rdx
+  pop rdi
+  pop rsi
+  pop r8
+  pop r9
+  pop r10
+  pop r11
+
+  iretq
+
+wait_send_ps2:
+  in al, 0x64
+  test al, 0x02
+  jnz wait_send_ps2
+  ret
+
+wait_read_ps2:
+  in al, 0x64
+  test al, 0x01
+  jz wait_send_ps2
+  ret
+
 load_gdt_and_idt:
 
   ;fill exception entries in idt
@@ -294,7 +335,7 @@ load_gdt_and_idt:
   out 0x21, al
   mov al, 0x01
   out 0x21, al
-  mov al, 0xfd ;mask all but irq 1
+  mov al, 0xf9 ;mask all but irq 1 and 2
   out 0x21, al
 
   mov al, 0x11
@@ -305,19 +346,54 @@ load_gdt_and_idt:
   out 0xa1, al
   mov al, 0x01
   out 0xa1, al
-  mov al, 0xff ;mask all
+  mov al, 0xef ;mask all but irq 12
   out 0xa1, al
 
+  ;register keyboard and mouse interrupts
+
   mov rdi, 0x21
   mov rsi, keyboard_isr
   call set_isr
 
-  ;set keyboard config
+  mov rdi, 0x2c
+  mov rsi, mouse_isr
+  call set_isr
+
+  ;set ps2 config
 
+  call wait_send_ps2
   mov al, 0x60
   out 0x64, al
-  mov dil, 0x01
-  call write_keyboard_byte
+
+  call wait_send_ps2
+  mov al, 0x03
+  out 0x60, al
+
+  ;set mouse defaults
+
+  call wait_send_ps2
+  mov al, 0xd4
+  out 0x64, al
+
+  call wait_send_ps2
+  mov al, 0xf6
+  out 0x60, al
+
+  call wait_read_ps2
+  in al, 0x60
+
+  ;enable mouse reporting
+
+  call wait_send_ps2
+  mov al, 0xd4
+  out 0x64, al
+
+  call wait_send_ps2
+  mov al, 0xf4
+  out 0x60, al
+
+  call wait_read_ps2
+  in al, 0x60
 
   ;make tss entry in gdt
 
-- 
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