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vga: add secondary stdvga variant

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Add a standard vga variant which doesn't occupy any legacy
resources and thus can easily be used as secondary (or legacy-free)
graphics adapter.  Programming must be done using the MMIO bar.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-11-12 14:29:47 +01:00
parent e2bbfc8ee2
commit 63e3e24db2
3 changed files with 75 additions and 3 deletions
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13
docs/specs/standard-vga.txt
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@ -5,9 +5,10 @@ QEMU Standard VGA
Exists in two variants, for isa and pci.
command line switches:
-vga std [ picks isa for -M isapc, otherwise pci ]
-device VGA [ pci variant ]
-device isa-vga [ isa variant ]
-vga std [ picks isa for -M isapc, otherwise pci ]
-device VGA [ pci variant ]
-device isa-vga [ isa variant ]
-device secondary-vga [ legacy-free pci variant ]
PCI spec
@ -31,9 +32,15 @@ PCI ROM Region:
Holds the vgabios (qemu 0.14+).
The legacy-free variant has no ROM and has PCI_CLASS_DISPLAY_OTHER
instead of PCI_CLASS_DISPLAY_VGA.
IO ports used
-------------
Doesn't apply to the legacy-free pci variant, use the MMIO bar instead.
03c0 - 03df : standard vga ports
01ce : bochs vbe interface index port
01cf : bochs vbe interface data port (x86 only)