Bochs VBE Extensions: Difference between revisions
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* 0xB0C3 - support for getting capabilities, support for using 8 bit DAC |
* 0xB0C3 - support for getting capabilities, support for using 8 bit DAC |
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* 0xB0C4 - [TODO: check and describe] |
* 0xB0C4 - [TODO: check and describe] |
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[TODO: if and when 4BPP modes are supported] |
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== Programming the BGA == |
== Programming the BGA == |
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=== Miscellaneous === |
=== Miscellaneous === |
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[TODO: check and describe |
[TODO: check and describe VBE_DISPI_INDEX_VIRT_WIDTH/HEIGHT, VBE_DISPI_INDEX_X/Y_OFFSET, VBE_DISPI_GETCAPS, VBE_DISPI_8BIT_DAC] |
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=== Example code === |
=== Example code === |
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outpw(VBE_DISPI_IOPORT_INDEX, IndexValue); |
outpw(VBE_DISPI_IOPORT_INDEX, IndexValue); |
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outpw(VBE_DISPI_IOPORT_DATA, DataValue); |
outpw(VBE_DISPI_IOPORT_DATA, DataValue); |
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} |
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unsigned short BgaReadRegister(unsigned short IndexValue) |
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{ |
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outpw(VBE_DISPI_IOPORT_INDEX, IndexValue); |
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return inpw(VBE_DISPI_IOPORT_DATA); |
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} |
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int BgaIsAvailable(void) |
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{ |
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return (BgaReadRegister(VBE_DISPI_INDEX_ID) == VBE_DISPI_ID4); |
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} |
} |
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