From 42932c472f4c5661120631c12c95753a8563e1c9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= <juhani@krekelä.fi>
Date: Mon, 30 Jan 2023 18:56:16 +0200
Subject: [PATCH] Convert to use int 0x15 mouse routines

---
 ponydos.asm | 174 +++++++++++++++++++++++++++-------------------------
 1 file changed, 91 insertions(+), 83 deletions(-)

diff --git a/ponydos.asm b/ponydos.asm
index dbb3543..bf81559 100644
--- a/ponydos.asm
+++ b/ponydos.asm
@@ -3,8 +3,6 @@ bits 16
 
 org 0x7c00
 
-mouse_packet equ 0x500
-
 jmp 0:start
 start:
 	cld
@@ -18,112 +16,124 @@ start:
 	mov ss, ax
 	mov sp, $$
 
-	; Hook up IRQ12
-	mov [0x01D0], word mouse_irq
-	mov [0x01D0 + 2], word 0
-
 	sti
 
-init_8042:
-	; TODO: This does not make sure the input buffer has been emptied
-	;       before writing to it. Works fine in QEMU, but may fail on
-	;       real hardware.
-	; Disable devices
-	mov al, 0xad
-	out 0x64, al
-	mov al, 0xa7
-	out 0x64, al
+initialize_mouse:
+	; Initialize mouse
+	; https://www.ctyme.com/intr/rb-1601.htm
+	mov ax, 0xc205
+	mov bh, 3 ; TODO: This is the usual PS/2 mouse packet size, but is it correct here?
+	int 0x15
+	jc .error
 
-	; Flush output buffer
-	in al, 0x60
+	; Set handler address
+	; https://www.ctyme.com/intr/rb-1603.htm
+	mov ax, 0xc207
+	; es is already set correctly
+	mov bx, mouse_handler
+	int 0x15
+	jc .error
 
-	; Get controller config byte
-	mov al, 0x20
-	out 0x64, al
-	.wait_config:
-		in al, 0x64
-		test al, 1<<0 ; Test whether output status buffer has data
-		jz .wait_config
-	in al, 0x60
+	; Enable mouse
+	; https://www.ctyme.com/intr/rb-1596.htm
+	mov ax, 0xc200
+	mov bh, 1
+	int 0x15
+	jc .error
 
-	; Enable second PS/2 device (likely mouse) interrupt
-	or al, 1<<1
-	mov bl, al
-	mov al, 0x60
-	out 0x64, al
-	mov al, bl
-	out 0x60, al
+	jmp mainloop
 
-	; Enable devices
-	mov al, 0xae
-	out 0x64, al
-	mov al, 0xa8
-	out 0x64, al
-
-init_mouse:
-	; Start packet streaming
-	mov al, 0xd4
-	out 0x64, al
-	mov al, 0xf4
-	out 0x60, al
+	.error:
+		; https://www.ctyme.com/intr/rb-1601.htm
+		mov ax, 0xc201
+		int 0x15
+		jmp initialize_mouse
 
 mainloop:
 	; TODO: everything
 
 hang:
 	hlt
+	;mov ax, 0x0e00 + '.'
+	;int 0x10
 	jmp hang
 
-mouse_irq:
+mouse_handler:
 	push ax
 	push bx
+	push bp
 
-	; Read mouse data
-	in al, 0x60
+	mov bp, sp
 
-	xor bh, bh
-	mov bl, [mouse_packet_fill]
-	test bl, bl
-	jnz .store_byte
+	; status
+	mov bx, [bp+16]
 
-	test al, 1<<3 ; Always-on bit in first byte
-	jz .finish
+	; X negative
+	test bl, 0x10
+	jz .no_x_negative
+	mov ax, 0x0e00 + '-'
+	int 0x10
+	.no_x_negative:
 
-	.store_byte:
-		mov [mouse_packet + bx], al
-		inc bl
-		cmp bl, 3
-		jne .finish
+	; X overflow
+	test bl, 0x40
+	jz .no_x_overflow
+	mov ax, 0x0e00 + 'o'
+	.no_x_overflow:
 
-	.full_packet:
-		; TODO: Do something useful with the mouse packet
-		push si
-		mov si, mouse_packet
-		lodsb
-		call hexprint8
-		lodsb
-		call hexprint8
-		lodsb
-		call hexprint8
-		pop si
-		mov ax, 0x0e20
-		int 0x10
+	; X
+	mov ax, [bp+14]
+	call hexprint8
+	mov ax, 0x0e00 + ' '
+	int 0x10
 
-		; Empty out the mouse packet buffer
-		xor bl, bl
+	; Y negative
+	test bl, 0x20
+	jz .no_y_negative
+	mov ax, 0x0e00 + '-'
+	int 0x10
+	.no_y_negative:
 
-	.finish:
-		; Store back possibly updated mouse packet fill
-		mov [mouse_packet_fill], bl
+	; Y overflow
+	test bl, 0x80
+	jz .no_y_overflow
+	mov ax, 0x0e00 + 'o'
+	.no_y_overflow:
 
-		; Reset PICs
-		mov al, 0x20
-		out 0xa0, al
-		out 0x20, al
+	; Y
+	mov ax, [bp+12]
+	call hexprint8
+	mov ax, 0x0e00 + ' '
+	int 0x10
 
+	; Left mouse
+	test bl, 0x01
+	jz .no_lmb
+	mov ax, 0x0e00 + 'L'
+	int 0x10
+	.no_lmb:
+
+	; Right mouse
+	test bl, 0x02
+	jz .no_rmb
+	mov ax, 0x0e00 + 'R'
+	int 0x10
+	.no_rmb
+
+	mov ax, 0x0e00 + 13
+	int 0x10
+	mov ax, 0x0e00 + 10
+	int 0x10
+
+	pop bp
 	pop bx
 	pop ax
-	iret
+	retf
+
+hexprint16:
+	xchg ah, al
+	call hexprint8
+	xchg ah, al
 
 hexprint8:
 	push ax
@@ -149,8 +159,6 @@ hexprint4:
 	pop ax
 	ret
 
-mouse_packet_fill db 0
-
 times 510-($-$$) db 0
 db 0x55
 db 0xaa