Re: [Qemu-devel] Re: Question about KVM and PC speaker

[Sebastian Herbszt]

Jan Kiszka wrote:
> > I have implemented the beep for vgabios-6b and it works on bochs but
> > fails on qemu.
> > With "-soundhw pcspk" i should hear it thru the hosts pc speaker, right?
>
> Yep, that's how it should work. Mind to share your code and tell us
> which test case you used?

FreeDOS floppy with "debug" command and assembly code:
mov ax,0e07
xor bx,bx
int 10

With the modified vgabios (see below) it does beep on bochs on vista,
but not on qemu.

- Sebastian

--- vgabios.c.orig 2009-05-12 22:24:22.000000000 +0200
+++ vgabios.c 2009-05-12 22:24:32.000000000 +0200
@@ -80,6 +80,9 @@
static void memcpyb();
static void memcpyw();

+static void delay_ticks();
+static void beep();
+
static void biosfn_set_video_mode();
static void biosfn_set_cursor_shape();
static void biosfn_set_cursor_pos();
@@ -1965,7 +1968,7 @@
 switch(car)
  {
   case 7:
-    //FIXME should beep
+    beep();
    break;

   case 8:
@@ -3765,6 +3768,57 @@
ASM_END
}

+  void
+delay_ticks(ticks)
+  Bit16u ticks;
+{
+ASM_START
+  pusha
+  push ds
+  xor dx,dx
+  mov ds,dx
+  mov cx,4[bp]
+  add cx,0x46c
+  adc dx,0x46e
+  sti
+delay_ticks_wait:
+  hlt
+  mov ax,0x46c
+  mov bx,0x46e
+  cmp dx,bx
+  jb delay_ticks_out
+  cmp cx,ax
+  ja delay_ticks_wait
+delay_ticks_out:
+  pop ds
+  popa
+ASM_END
+}
+
+void beep()
+{
+ASM_START
+  pusha
+  mov al,#0xb6
+  out #0x43,al
+  mov al,#0x33
+  out #0x42,al
+  mov al,#0x5
+  out #0x42,al
+  in al,#0x61
+  push ax
+  or al,#0x03
+  out #0x61,al
+  mov cx,#0x4
+  push cx
+  call _delay_ticks
+  pop cx
+  pop ax
+  out #0x61,al
+  popa
+ASM_END
+}
+
#ifdef DEBUG
void unimplemented()
{