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display/stdvga: add edid support.

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This patch adds edid support to the qemu stdvga.  It is turned off by
default and can be enabled with the new edid property.  The patch also
adds xres and yres properties to specify the video mode you want the
guest use.  Works only with edid enabled and updated guest driver.

The mmio bar of the stdvga has some unused address space at the start.
It was reserved just in case it'll be needed for virtio, but it turned
out to not be needed for that.  So let's use that region to place the
EDID data block there.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20180925075646.25114-6-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2018-09-25 09:56:46 +02:00
parent 06510b899f
commit d46b40fce2
4 changed files with 34 additions and 7 deletions
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2
docs/specs/standard-vga.txt
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@ -61,7 +61,7 @@ MMIO area spec
Likewise applies to the pci variant only for obvious reasons.
0000 - 03ff : reserved, for possible virtio extension.
0000 - 03ff : edid data blob.
0400 - 041f : vga ioports (0x3c0 -> 0x3df), remapped 1:1.
word access is supported, bytes are written
in little endia order (aka index port first),