h6. [[PCI]] h6(. » [[PCI SWI Calls|SWI Calls]] h6((. » PCI_IORead h2. PCI_IORead h5. (SWI &50384) |_<^{width:4em}. Entry | | |<^. R0 |<^. PCI address | |<^. R2 |<^. Access size (1, 2 or 4 for byte/half word/word) | |_<^{width:4em}. Exit | | |<^. R0 |<^. Preserved ? | |<^. R1 |<^. Value read | |<^. R2 |<^. Preserved ? | h4. Use The purpose of this call is to perform an IO read cycle of the denoted size. h4. Notes The PCI address used by R0 on entry can be found by calling [[PCI_HardwareAddress]]. An IO write operation is performed by calling [[PCI_IOWrite]]. h4. See also * [[PCI_HardwareAddress]] * [[PCI_IOWrite]]