ACCESS_RANGE structure (storport.h)
An ACCESS_RANGE describes a memory or I/O port range used by an HBA.
Syntax
typedef struct _ACCESS_RANGE {
STOR_PHYSICAL_ADDRESS RangeStart;
ULONG RangeLength;
BOOLEAN RangeInMemory;
} ACCESS_RANGE, *PACCESS_RANGE;
Members
RangeStart
Contains a physical address that specifies the bus-relative base address of a range used by the HBA. The value of this member can be obtained from one of the AccessRanges elements in the PORT_CONFIGURATION_INFORMATION structure. This is an address that can be passed into StorPortGetDeviceBase.
RangeLength
Specifies the size, in bytes, or number of ports in the range. A miniport driver must ensure that this value matches the range actually decoded by the adapter. For example, if the HBA uses seven registers but responds to eight, this member should be set to 8.
RangeInMemory
Indicates the range is in memory when TRUE, rather than in I/O space. When FALSE, the range is in I/O space.
Remarks
Each ACCESS_RANGE is an AccessRanges array element within the PORT_CONFIGURATION_INFORMATION structure that is passed to a miniport driver's HwStorFindAdapter routine.
Storport allocates memory for the access ranges and initializes the AccessRanges member. The miniport driver's HwStorFindAdapter routine should use only the supplied addresses and should never attempt to find other HBAs on the same bus using addresses of its own devising. Attempting to access other bus-relative port or memory ranges when the port driver has supplied range information, particularly in x86-only systems in which some devices are initialized in x86 real mode, can cause other devices on the bus to fail initialization or even cause the system to fail the boot process.
Requirements
| Requirement | Value |
|---|---|
| Header | storport.h (include Srb.h, Storport.h, Strmini.h) |