95 lines
2.1 KiB
ReStructuredText
95 lines
2.1 KiB
ReStructuredText
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QEMU Standard VGA
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=================
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Exists in two variants, for isa and pci.
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command line switches:
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``-vga std``
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picks isa for -M isapc, otherwise pci
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``-device VGA``
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pci variant
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``-device isa-vga``
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isa variant
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``-device secondary-vga``
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legacy-free pci variant
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PCI spec
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--------
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Applies to the pci variant only for obvious reasons.
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PCI ID
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``1234:1111``
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PCI Region 0
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Framebuffer memory, 16 MB in size (by default).
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Size is tunable via vga_mem_mb property.
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PCI Region 1
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Reserved (so we have the option to make the framebuffer bar 64bit).
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PCI Region 2
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MMIO bar, 4096 bytes in size (QEMU 1.3+)
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PCI ROM Region
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Holds the vgabios (QEMU 0.14+).
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The legacy-free variant has no ROM and has ``PCI_CLASS_DISPLAY_OTHER``
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instead of ``PCI_CLASS_DISPLAY_VGA``.
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IO ports used
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-------------
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Doesn't apply to the legacy-free pci variant, use the MMIO bar instead.
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``03c0 - 03df``
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standard vga ports
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``01ce``
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bochs vbe interface index port
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``01cf``
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bochs vbe interface data port (x86 only)
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``01d0``
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bochs vbe interface data port
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Memory regions used
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-------------------
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``0xe0000000``
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Framebuffer memory, isa variant only.
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The pci variant used to mirror the framebuffer bar here, QEMU 0.14+
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stops doing that (except when in ``-M pc-$old`` compat mode).
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MMIO area spec
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--------------
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Likewise applies to the pci variant only for obvious reasons.
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``0000 - 03ff``
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edid data blob.
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``0400 - 041f``
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vga ioports (``0x3c0`` to ``0x3df``), remapped 1:1. Word access
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is supported, bytes are written in little endian order (aka index
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port first), so indexed registers can be updated with a single
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mmio write (and thus only one vmexit).
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``0500 - 0515``
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bochs dispi interface registers, mapped flat without index/data ports.
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Use ``(index << 1)`` as offset for (16bit) register access.
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``0600 - 0607``
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QEMU extended registers. QEMU 2.2+ only.
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The pci revision is 2 (or greater) when these registers are present.
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The registers are 32bit.
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``0600``
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QEMU extended register region size, in bytes.
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``0604``
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framebuffer endianness register.
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- ``0xbebebebe`` indicates big endian.
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- ``0x1e1e1e1e`` indicates little endian.
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