VGA registers and memory

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Introduction

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MMIO registers

8-bit space prmvio [0x1000]
nv3-mmio 0xc0000: PRMVIO [NV3:NV40]
nv3-mmio 0xc0000+i*0x2000: PRMVIO[i] (i<2) [NV40:G80]

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8-bit space nv3-prmfb [0x20000]
nv3-mmio 0xa0000: PRMFB

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