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Add decoding logic for VGA indexed registers.

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This commit is contained in:
Jukka Heinonen 2002-07-28 17:42:30 +00:00 committed by Alexandre Julliard
parent 37553b7a13
commit 0984b34783
1 changed files with 67 additions and 0 deletions
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67
dlls/winedos/vga.c
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@ -44,6 +44,24 @@ static int vga_depth;
static BYTE vga_text_attr; static BYTE vga_text_attr;
static char *textbuf_old = NULL; static char *textbuf_old = NULL;
/*
* VGA controller ports 0x3c0, 0x3c4, 0x3ce and 0x3d4 are
* indexed registers. These ports are used to select VGA controller
* subregister that can be written to or read from using ports 0x3c1,
* 0x3c5, 0x3cf or 0x3d5. Selected subregister indexes are
* stored in variables vga_index_*.
*
* Port 0x3c0 is special because it is both index and
* data-write register. Flip-flop vga_address_3c0 tells whether
* the port acts currently as an address register. Reading from port
* 0x3da resets the flip-flop to address mode.
*/
static BYTE vga_index_3c0;
static BYTE vga_index_3c4;
static BYTE vga_index_3ce;
static BYTE vga_index_3d4;
static BOOL vga_address_3c0 = TRUE;
static BOOL vga_mode_initialized = FALSE; static BOOL vga_mode_initialized = FALSE;
static CRITICAL_SECTION vga_lock = CRITICAL_SECTION_INIT("VGA"); static CRITICAL_SECTION vga_lock = CRITICAL_SECTION_INIT("VGA");
@ -808,6 +826,21 @@ static PALETTEENTRY paldat;
void VGA_ioport_out( WORD port, BYTE val ) void VGA_ioport_out( WORD port, BYTE val )
{ {
switch (port) { switch (port) {
case 0x3c0:
if (vga_address_3c0)
vga_index_3c0 = val;
else
FIXME("Unsupported index, register 0x3c0: 0x%02x (value 0x%02x)\n",
vga_index_3c0, val);
vga_address_3c0 = !vga_address_3c0;
break;
case 0x3c4:
vga_index_3c4 = val;
break;
case 0x3c5:
FIXME("Unsupported index, register 0x3c4: 0x%02x (value 0x%02x)\n",
vga_index_3c4, val);
break;
case 0x3c8: case 0x3c8:
palreg=val; palcnt=0; break; palreg=val; palcnt=0; break;
case 0x3c9: case 0x3c9:
@ -817,6 +850,20 @@ void VGA_ioport_out( WORD port, BYTE val )
palcnt=0; palcnt=0;
} }
break; break;
case 0x3ce:
vga_index_3ce = val;
break;
case 0x3cf:
FIXME("Unsupported index, register 0x3ce: 0x%02x (value 0x%02x)\n",
vga_index_3ce, val);
break;
case 0x3d4:
vga_index_3d4 = val;
break;
case 0x3d5:
FIXME("Unsupported index, register 0x3d4: 0x%02x (value 0x%02x)\n",
vga_index_3d4, val);
break;
default: default:
FIXME("Unsupported VGA register: 0x%04x (value 0x%02x)\n", port, val); FIXME("Unsupported VGA register: 0x%04x (value 0x%02x)\n", port, val);
} }
@ -827,7 +874,27 @@ BYTE VGA_ioport_in( WORD port )
BYTE ret; BYTE ret;
switch (port) { switch (port) {
case 0x3c1:
FIXME("Unsupported index, register 0x3c0: 0x%02x\n",
vga_index_3c0);
return 0xff;
case 0x3c5:
FIXME("Unsupported index, register 0x3c4: 0x%02x\n",
vga_index_3c4);
return 0xff;
case 0x3cf:
FIXME("Unsupported index, register 0x3ce: 0x%02x\n",
vga_index_3ce);
return 0xff;
case 0x3d5:
FIXME("Unsupported index, register 0x3d4: 0x%02x\n",
vga_index_3d4);
return 0xff;
case 0x3da: case 0x3da:
/*
* Read from this register resets register 0x3c0 address flip-flop.
*/
vga_address_3c0 = TRUE;
/* since we don't (yet?) serve DOS VM requests while VGA_Poll is running, /* since we don't (yet?) serve DOS VM requests while VGA_Poll is running,
we need to fake the occurrence of the vertical refresh */ we need to fake the occurrence of the vertical refresh */
ret=vga_refresh?0x00:0x0b; /* toggle video RAM and lightpen and VGA refresh bits ! */ ret=vga_refresh?0x00:0x0b; /* toggle video RAM and lightpen and VGA refresh bits ! */