ScsiPortGetVirtualAddress function

Description

The ScsiPortGetVirtualAddress routine returns a virtual address associated with a physical address if the physical address was obtained by a call to ScsiPortGetPhysicalAddress.

Note The SCSI port driver and SCSI miniport driver models may be altered or unavailable in the future. Instead, we recommend using the Storport driver and Storport miniport driver models.

Parameters

HwDeviceExtension [in]

Pointer to the hardware device extension. This is a per-HBA storage area that the port driver allocates and initializes on behalf of the miniport driver. Miniport drivers usually store HBA-specific information in this extension, such as the state of the HBA and the HBA's mapped access ranges. This area is available to the miniport driver in the DeviceExtension->HwDeviceExtension member of the HBA's device object immediately after the miniport driver calls ScsiPortInitialize. The port driver frees this memory when it removes the device.

PhysicalAddress [in]

Specifies the physical address to be mapped. This value must have been returned by ScsiPortGetPhysicalAddress and must be from an uncached device extension or SRB extension.

Return value

ScsiPortGetVirtualAddress returns a mapped pointer for the given input address. If the PhysicalAddress value is invalid, it returns NULL.

Remarks

ScsiPortGetVirtualAddress uses SCSI_PHYSICAL_ADDRESS to represent physical addresses.

typedef PHYSICAL_ADDRESS SCSI_PHYSICAL_ADDRESS, *PSCSI_PHYSICAL_ADDRESS;

The SCSI_PHYSICAL_ADDRESS type is an operating system-independent data type that SCSI miniport drivers use to represent either a physical addresses or a bus-relative address.

Note The SCSI port driver and SCSI miniport driver models may be altered or unavailable in the future. Instead, we recommend using the Storport driver and Storport miniport driver models.

See also

ScsiPortGetPhysicalAddress

ScsiPortGetUncachedExtension