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vga: fix bochs alignment issue

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The bochs dispi interface traditionally uses port 0x1ce as 16bit index
register and port 0x1cf as 16bit data register.  The later is unaligned,
and probably for that reason the the data register was moved to 0x1d0
for non-x86 archs.

This patch makes the data register available at 0x1d0 on x86 too.  The
old x86 location is kept for compatibility reasons, so both 0x1cf and
0x1d0 can be used as data register on x86.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-11-12 12:40:46 +01:00
parent 6801038bc5
commit df9ffb726f
2 changed files with 3 additions and 3 deletions
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3
docs/specs/standard-vga.txt
View file

@ -36,7 +36,8 @@ IO ports used
03c0 - 03df : standard vga ports
01ce : bochs vbe interface index port
01cf : bochs vbe interface data port
01cf : bochs vbe interface data port (x86 only)
01d0 : bochs vbe interface data port
Memory regions used

3
hw/vga.c
View file

@ -2321,9 +2321,8 @@ static const MemoryRegionPortio vbe_portio_list[] = {
{ 0, 1, 2, .read = vbe_ioport_read_index, .write = vbe_ioport_write_index },
# ifdef TARGET_I386
{ 1, 1, 2, .read = vbe_ioport_read_data, .write = vbe_ioport_write_data },
# else
{ 2, 1, 2, .read = vbe_ioport_read_data, .write = vbe_ioport_write_data },
# endif
{ 2, 1, 2, .read = vbe_ioport_read_data, .write = vbe_ioport_write_data },
PORTIO_END_OF_LIST(),
};