Intel 82801EB, Руководство программиста

Страница: 40 / 59

Theory of Operation
R
40 SATA Programmer’s Reference Manual
.
.
.
}
#define SATA_GET_PORT_STATUS 'SPSG' // Control method to execute
//
// SATA_CheckPortStatus - Get the SATA port status
//
// Entry:
// pDO ==> pointer to our physical device object
// pdwStatus ==> ptr to receive port status value
//
// Exit:
// Returns status code.
// If success, pdwStatus has the SATA port status:
// 0 ==> No devices connected
// 1 ==> Master device present
// 2 ==> Slave device present
// 3 ==> Master and slave device present
// -1 ==> Device presence unknown
//
NTSTATUS
SATA_CheckPortStatus( IN PDEVICE_OBJECT pDO, PDWORD pdwStatus)
{
NTSTATUS status = STATUS_SUCCESS;
PACPI_METHOD_ARGUMENT pArgBuf;
ACPI_EVAL_INPUT_BUFFER InputBuffer;
ACPI_EVAL_OUTPUT_BUFFER OutputBuffer;
//
// setup the request structure
//
InputBuffer->MethodNameAsUlong = SATA_GET_PORT_STATUS;
InputBuffer->Signature = ACPI_EVAL_INPUT_BUFFER_SIGNATURE;
//
// finally, do the request
//
status = SendIRP( pDO, // this logical channel's PDO
IOCTL_ACPI_EVAL_METHOD,
pInputBuffer, // ptr to input buffer
sizeof( ACPI_EVAL_INPUT_BUFFER), // its size
pOutputBuffer, // ptr to output buffer
sizeof( ACPI_EVAL_OUTPUT_BUFFER); // its size
//