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Diffstat (limited to 'qemu/docs/specs/standard-vga.txt')
| -rw-r--r-- | qemu/docs/specs/standard-vga.txt | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/qemu/docs/specs/standard-vga.txt b/qemu/docs/specs/standard-vga.txt deleted file mode 100644 index 19d2a7450..000000000 --- a/qemu/docs/specs/standard-vga.txt +++ /dev/null @@ -1,81 +0,0 @@ - -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 ] - -device secondary-vga [ legacy-free pci variant ] - - -PCI spec --------- - -Applies to the pci variant only for obvious reasons. - -PCI ID: 1234:1111 - -PCI Region 0: - Framebuffer memory, 16 MB in size (by default). - Size is tunable via vga_mem_mb property. - -PCI Region 1: - Reserved (so we have the option to make the framebuffer bar 64bit). - -PCI Region 2: - MMIO bar, 4096 bytes in size (qemu 1.3+) - -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) -01d0 : bochs vbe interface data port - - -Memory regions used -------------------- - -0xe0000000 : Framebuffer memory, isa variant only. - -The pci variant used to mirror the framebuffer bar here, qemu 0.14+ -stops doing that (except when in -M pc-$old compat mode). - - -MMIO area spec --------------- - -Likewise applies to the pci variant only for obvious reasons. - -0000 - 03ff : reserved, for possible virtio extension. -0400 - 041f : vga ioports (0x3c0 -> 0x3df), remapped 1:1. - word access is supported, bytes are written - in little endia order (aka index port first), - so indexed registers can be updated with a - single mmio write (and thus only one vmexit). -0500 - 0515 : bochs dispi interface registers, mapped flat - without index/data ports. Use (index << 1) - as offset for (16bit) register access. - -0600 - 0607 : qemu extended registers. qemu 2.2+ only. - The pci revision is 2 (or greater) when - these registers are present. The registers - are 32bit. - 0600 : qemu extended register region size, in bytes. - 0604 : framebuffer endianness register. - - 0xbebebebe indicates big endian. - - 0x1e1e1e1e indicates little endian. |