Intel 82801EB, Programmer'S Reference Manual

Page: 31 / 59

Theory of Operation
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SATA Programmer’s Reference Manual 31
Appendix A – Coding Examples
A.1 Enabling/Disabling SATA Ports from a WDM Driver
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//
// Function Proto for Reading and Writing to device configuration space
//
NTSTATUS ReadWriteConfigSpace( PDEVICE_OBJECT pDO, BOOLEAN fRead, PVOID pBuf,
ULONG Offset, ULONG Length);
//
//
// This example illustrates how a WDM driver could read/write the PCS.PxE bits for
// enabling or disabling the SATA port(s).
//
// This example assumes direct access to the SATA PCI Configuration space
//
//
// Disable the ports. For simplicity, we don’t do any status checking
//
BYTE val = 0; // to disable both ports
ReadWriteConfigSpace( pDO, TRUE, &val, 0x92, sizeof( val));
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//
// Enable the ports. For simplicity, we don’t do any status checking
//
BYTE val = 3; // to enable both ports
ReadWriteConfigSpace( pDO, FALSE, &val, 0x92, sizeof( val));
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//
// Enable only port 0. For simplicity, we don’t do any status
// checking
//
BYTE val;