IODMACommand |
Inherits from: | |
Declared In: |
A mechanism to convert memory references to I/O bus addresses.
The IODMACommand is supersedes the IOMemoryCursor and greatly enhances the functionality and power of it. The command can be specified to output 64 bit physical addresses and also allows driver writers bypass mapping hardware or get addresses suitable for non-snooped DMA.
The command is designed to be very easily subclassable. Most driver writers need to associate some DMA operations with their memory descriptor and usually use a C structure for that purpose. This structure is often kept in a linked list. This IODMACommand has built it
It is envisaged that a pool of IODMACommands will be created at driver initialisation and each command will be kept in an IOCommandPool while not in use. However if developers wishes to maintain their own free lists that is certainly possible. See the
The IODMACommand can be used in a 'weak-linked' manner. To do this you must avoid using any static member functions. Use the, much slower but safe, weakWithSpecification function. On success a dma command instance will be returned. This instance can then be used to clone as many commands as is needed. Remember deriving from this class can not be done weakly, that is no weak subclassing!
Clears the DMACommand's current memory descriptor
Creates a new command based on the specification of the current one.
Complete processing of DMA mappings after an I/O transfer is finished.
Helper function for a type checked call to genIOVMSegments(qv), for use with an IODMACommand set up with the output function kIODMACommandOutputHost32, kIODMACommandOutputBig32, or kIODMACommandOutputLittle32. If the output function of the IODMACommand is not a 32 bit function, results will be incorrect.
Helper function for a type checked call to genIOVMSegments(qv), for use with an IODMACommand set up with the output function kIODMACommandOutputHost64, kIODMACommandOutputBig64, or kIODMACommandOutputLittle64. If the output function of the IODMACommand is not a 64 bit function, results will be incorrect.
Generates a physical scatter/gather for the current DMA command
Get the current memory descriptor
Returns the offset and length into the target IOMemoryDescriptor of a prepared IODDMACommand.
Primary initializer for the IODMACommand class.
Output big-endian Segment32 output segment function.
Output big-endian Segment64 output segment function.
Output host natural Segment32 output segment function.
Output host natural Segment64 output segment function.
Output little-endian Segment32 output segment function.
Output little-endian Segment64 output segment function.
Prepare the memory for an I/O transfer.
Prepare the memory for an I/O transfer with a new specification.
Copy data from the IODMACommand's buffer to the specified buffer.
Sets and resets the DMACommand's current memory descriptor
Bring IOMemoryDescriptor and IODMACommand buffers into sync.
Creates and initialises an IODMACommand in one operation if this version of the operating system supports it.
Creates and initializes an IODMACommand in one operation.
Copy data to the IODMACommand's buffer from the specified buffer.
clearMemoryDescriptor |
Clears the DMACommand's current memory descriptor
public
virtual IOReturn clearMemoryDescriptor( bool autoComplete = true);
autoComplete
An optional boolean variable that will call the complete() function automatically before the memory descriptor is processed. Defaults to true.
completes and invalidates the cache if the DMA command is currently active, copies all data from bounce buffers if necessary and releases all resources acquired during setMemoryDescriptor.
cloneCommand |
Creates a new command based on the specification of the current one.
public
virtual IODMACommand *cloneCommand( void *refCon = 0);
Returns a new memory cursor if successfully created and initialised, 0 otherwise.
Factory function to create and initialise an IODMACommand in one operation. The current command's specification will be duplicated in the new object, but however none of its state will be duplicated. This means that it is safe to clone a command even if it is currently active and running, however you must be certain that the command to be duplicated does have a valid reference for the duration.
complete |
Complete processing of DMA mappings after an I/O transfer is finished.
public
virtual IOReturn complete( bool invalidateCache = true, bool synchronize = true);
invalidCache
Invalidate the caches for the memory descriptor. Defaults to true for kNonCoherent and is ignored by the other types.
synchronize
Copy any buffered data back to the target IOMemoryDescriptor. Defaults to true, if synchronize() is being used to explicitly copy data, passing false may avoid an unneeded copy.
kIOReturnNotReady if not prepared, kIOReturnSuccess otherwise.
This method should not be called unless a prepare was previously issued; the prepare() and complete() must occur in pairs, before and after an I/O transfer
gen32IOVMSegments |
Helper function for a type checked call to genIOVMSegments(qv), for use with an IODMACommand set up with the output function kIODMACommandOutputHost32, kIODMACommandOutputBig32, or kIODMACommandOutputLittle32. If the output function of the IODMACommand is not a 32 bit function, results will be incorrect.
public
inline IOReturn gen32IOVMSegments( UInt64 *offset, Segment32 *segments, UInt32 *numSegments) ;
gen64IOVMSegments |
Helper function for a type checked call to genIOVMSegments(qv), for use with an IODMACommand set up with the output function kIODMACommandOutputHost64, kIODMACommandOutputBig64, or kIODMACommandOutputLittle64. If the output function of the IODMACommand is not a 64 bit function, results will be incorrect.
public
inline IOReturn gen64IOVMSegments( UInt64 *offset, Segment64 *segments, UInt32 *numSegments) ;
genIOVMSegments |
Generates a physical scatter/gather for the current DMA command
public
virtual IOReturn genIOVMSegments( UInt64 *offset, void *segments, UInt32 *numSegments);
offset
input/output parameter, defines the starting and ending offset in the memory descriptor, relative to any offset passed to the prepare() method.
segments
Void pointer to base of output physical scatter/gather list. Always passed directly onto the SegmentFunction.
numSegments
Input/output parameter Number of segments that can fit in the segment array and returns number of segments generated.
kIOReturnSuccess on success, kIOReturnOverrun if the memory descriptor is exhausted, kIOReturnMessageTooLarge if the output segment function's address bits has insufficient resolution for a segment, kIOReturnNotReady if the DMA command has not be prepared, kIOReturnBadArgument if the DMA command doesn't have a memory descriptor yet or some of the parameters are NULL and kIOReturnNotReady if the DMA command is not prepared.
Generates a list of physical segments from the given memory descriptor, relative to the current position of the descriptor. The constraints that are set during initialisation will be respected. This function maintains the state across multiple calls for efficiency. However the state is discarded if the new offset is not the expected one.
getMemoryDescriptor |
Get the current memory descriptor
public
virtual const IOMemoryDescriptor *getMemoryDescriptor() const;
getPreparedOffsetAndLength |
Returns the offset and length into the target IOMemoryDescriptor of a prepared IODDMACommand.
public
virtual IOReturn getPreparedOffsetAndLength( UInt64 *offset, UInt64 *length);
offset
returns the starting offset in the memory descriptor the DMA command was prepared with. Pass NULL for don't care.
length
returns the length in the memory descriptor the DMA command was prepared with. Pass NULL for don't care.
An IOReturn code. kIOReturnNotReady if the IODMACommand is not prepared.
If successfully prepared, returns the offset and length into the IOMemoryDescriptor. Will fail for an unprepared IODMACommand.
initWithSpecification |
Primary initializer for the IODMACommand class.
public
virtual bool initWithSpecification( SegmentFunction outSegFunc, UInt8 numAddressBits, UInt64 maxSegmentSize, MappingOptions mappingOptions = kMapped, UInt64 maxTransferSize = 0, UInt32 alignment = 1, IOMapper *mapper = 0, void *refCon = 0);
outSegFunc
SegmentFunction to call to output one physical segment. A set of nine commonly required segment functions are provided.
numAddressBits
Number of bits that the hardware uses on its internal address bus. Typically 32 but may be more on modern hardware. A 0 implies no-restriction other than that implied by the output segment function.
maxSegmentSize
Maximum allowable size for one segment. Defaults to 0 which means any size.
mappingOptions
is the type of mapping that is required to translate an IOMemoryDescriptor into the desired number of bits. For instance if your hardware only supports 32 bits but must run on machines with > 4G of RAM some mapping will be required. Number of bits will be specified in numAddressBits, see below.This parameter can take 3 values:- kNonCoherent - used for non-coherent hardware transfers, Mapped - Validate that all I/O bus generated addresses are within the number of addressing bits specified, Bypassed indicates that bypassed addressing is required, this is used when the hardware transferes are into coherent memory but no mapping is required. See also prepare() for failure cases.
maxTransferSize
Maximum size of an entire transfer. Defaults to 0 indicating no maximum.
alignment
Alignment restriction, in bytes, on I/O bus addresses. Defaults to single byte alignment.
mapper
For mapping types kMapped & kBypassed mapper is used to define the hardware that will perform the mapping, defaults to the system mapper.
Can fail if the mapping type is not recognised, if one of the 3 mandatory parameters are set to 0, if a 32 bit output function is selected when more than 32 bits of address is required or, if kBypassed is requested on a machine that doesn't support bypassing. Returns true otherwise.
OutputBig32 |
Output big-endian Segment32 output segment function.
public
static bool OutputBig32( IODMACommand *target, Segment64 seg, void *segs, UInt32 ind);
OutputBig64 |
Output big-endian Segment64 output segment function.
public
static bool OutputBig64( IODMACommand *target, Segment64 seg, void *segs, UInt32 ind);
OutputHost32 |
Output host natural Segment32 output segment function.
public
static bool OutputHost32( IODMACommand *target, Segment64 seg, void *segs, UInt32 ind);
OutputHost64 |
Output host natural Segment64 output segment function.
public
static bool OutputHost64( IODMACommand *target, Segment64 seg, void *segs, UInt32 ind);
OutputLittle32 |
Output little-endian Segment32 output segment function.
public
static bool OutputLittle32( IODMACommand *target, Segment64 seg, void *segs, UInt32 ind);
OutputLittle64 |
Output little-endian Segment64 output segment function.
public
static bool OutputLittle64( IODMACommand *target, Segment64 seg, void *segs, UInt32 ind);
prepare |
Prepare the memory for an I/O transfer.
public
virtual IOReturn prepare( UInt64 offset = 0, UInt64 length = 0, bool flushCache = true, bool synchronize = true);
offset
defines the starting offset in the memory descriptor the DMA command will operate on. genIOVMSegments will produce its results based on the offset and length passed to the prepare method.
length
defines the ending position in the memory descriptor the DMA command will operate on. genIOVMSegments will produce its results based on the offset and length passed to the prepare method.
flushCache
Flush the caches for the memory descriptor and make certain that the memory cycles are complete. Defaults to true for kNonCoherent and is ignored by the other types.
synchronize
Copy any buffered data back from the target IOMemoryDescriptor. Defaults to true, if synchronize() is being used to explicitly copy data, passing false may avoid an unneeded copy.
An IOReturn code.
Allocate the mapping resources neccessary for this transfer, specifying a sub range of the IOMemoryDescriptor that will be the target of the I/O. The complete() method frees these resources. Data may be copied to buffers for kIODirectionOut memory descriptors, depending on hardware mapping resource availabilty or alignment restrictions. It should be noted that the this function may block and should only be called on the clients context, i.e never call this routine while gated; also the call itself is not thread safe though this should be an issue as each IODMACommand is independant.
prepareWithSpecification |
Prepare the memory for an I/O transfer with a new specification.
public
virtual IOReturn prepareWithSpecification( SegmentFunction outSegFunc, UInt8 numAddressBits, UInt64 maxSegmentSize, MappingOptions mappingOptions = kMapped, UInt64 maxTransferSize = 0, UInt32 alignment = 1, IOMapper *mapper = 0, UInt64 offset = 0, UInt64 length = 0, bool flushCache = true, bool synchronize = true);
outSegFunc
SegmentFunction to call to output one physical segment. A set of nine commonly required segment functions are provided.
numAddressBits
Number of bits that the hardware uses on its internal address bus. Typically 32 but may be more on modern hardware. A 0 implies no-restriction other than that implied by the output segment function.
maxSegmentSize
Maximum allowable size for one segment. Defaults to 0 which means any size.
mappingOptions
is the type of mapping that is required to translate an IOMemoryDescriptor into the desired number of bits. For instance if your hardware only supports 32 bits but must run on machines with > 4G of RAM some mapping will be required. Number of bits will be specified in numAddressBits, see below.This parameter can take 3 values:- kNonCoherent - used for non-coherent hardware transfers, Mapped - Validate that all I/O bus generated addresses are within the number of addressing bits specified, Bypassed indicates that bypassed addressing is required, this is used when the hardware transferes are into coherent memory but no mapping is required. See also prepare() for failure cases.
maxTransferSize
Maximum size of an entire transfer. Defaults to 0 indicating no maximum.
alignment
Alignment restriction, in bytes, on I/O bus addresses. Defaults to single byte alignment.
mapper
For mapping types kMapped & kBypassed mapper is used to define the hardware that will perform the mapping, defaults to the system mapper.
offset
defines the starting offset in the memory descriptor the DMA command will operate on. genIOVMSegments will produce its results based on the offset and length passed to the prepare method.
length
defines the ending position in the memory descriptor the DMA command will operate on. genIOVMSegments will produce its results based on the offset and length passed to the prepare method.
flushCache
Flush the caches for the memory descriptor and make certain that the memory cycles are complete. Defaults to true for kNonCoherent and is ignored by the other types.
synchronize
Copy any buffered data back from the target IOMemoryDescriptor. Defaults to true, if synchronize() is being used to explicitly copy data, passing false may avoid an unneeded copy.
An IOReturn code. Can fail if the mapping type is not recognised, if one of the 3 mandatory parameters are set to 0, if a 32 bit output function is selected when more than 32 bits of address is required or, if kBypassed is requested on a machine that doesn't support bypassing.
Allocate the mapping resources neccessary for this transfer, specifying a sub range of the IOMemoryDescriptor that will be the target of the I/O. The complete() method frees these resources. Data may be copied to buffers for kIODirectionOut memory descriptors, depending on hardware mapping resource availabilty or alignment restrictions. It should be noted that the this function may block and should only be called on the clients context, i.e never call this routine while gated; also the call itself is not thread safe though this should be an issue as each IODMACommand is independant.
readBytes |
Copy data from the IODMACommand's buffer to the specified buffer.
public
UInt64 readBytes( UInt64 offset, void *bytes, UInt64 length);
offset
A byte offset into the IODMACommand's memory, relative to the prepared offset.
bytes
The caller supplied buffer to copy the data to.
length
The length of the data to copy.
The number of bytes copied, zero will be returned if the specified offset is beyond the prepared length of the IODMACommand.
This method copies data from the IODMACommand's memory at the given offset, to the caller's buffer. The IODMACommand must be prepared, and the offset is relative to the prepared offset.
setMemoryDescriptor |
Sets and resets the DMACommand's current memory descriptor
public
virtual IOReturn setMemoryDescriptor( const IOMemoryDescriptor *mem, bool autoPrepare = true);
mem
A pointer to the current I/Os memory descriptor.
autoPrepare
An optional boolean variable that will call the prepare() function automatically after the memory descriptor is processed. Defaults to true.
Returns kIOReturnSuccess, kIOReturnBusy if currently prepared, kIOReturnNoSpace if the length(mem) >= Maximum Transfer Size or the error codes returned by prepare() (qv).
The DMA command will configure itself based on the information that it finds in the memory descriptor. It looks for things like the direction of the memory descriptor and whether the current memory descriptor is already mapped into some IOMMU. As a programmer convenience it can also prepare the memory descriptor immediately. See prepare(). Note the IODMACommand is designed to used multiple times with a succession of memory descriptors, making the pooling of commands possible. It is an error though to attempt to reset a currently prepared() DMA command. Warning: This routine may block so never try to autoprepare an IODMACommand while in a gated context, i.e. one of the WorkLoops action call outs.
synchronize |
Bring IOMemoryDescriptor and IODMACommand buffers into sync.
public
virtual IOReturn synchronize( IOOptionBits options);
options
Specifies the direction of the copy: kIODirectionOut copy IOMemoryDesciptor memory to any IODMACommand buffers. By default this action takes place automatically at prepare(). kIODirectionIn copy any IODMACommand buffers back to the IOMemoryDescriptor. By default this action takes place automatically at complete(). kForceDoubleBuffer copy the entire prepared range to a new page aligned buffer.
kIOReturnNotReady if not prepared, kIOReturnBadArgument if invalid options are passed, kIOReturnSuccess otherwise.
This method should not be called unless a prepare was previously issued. If needed a caller may synchronize any IODMACommand buffers with the original IOMemoryDescriptor buffers.
weakWithSpecification |
Creates and initialises an IODMACommand in one operation if this version of the operating system supports it.
public
static inline IOReturn weakWithSpecification ( IODMACommand **newCommand, SegmentFunction outSegFunc, UInt8 numAddressBits, UInt64 maxSegmentSize, MappingOptions mapType = kMapped, UInt64 maxTransferSize = 0, UInt32 alignment = 1, IOMapper *mapper = 0, void *refCon = 0) __attribute__((always_inline));
newCommand
Output reference variable of the newly created IODMACommand.
outSegFunc
SegmentFunction to call to output one physical segment. A set of nine commonly required segment functions are provided.
numAddressBits
Number of bits that the hardware uses on its internal address bus. Typically 32 but may be more on modern hardware. A 0 implies no-restriction other than that implied by the output segment function.
maxSegmentSize
Maximum allowable size for one segment. Zero is treated as an unlimited segment size.
mapType
is the type of mapping that is required to translate an IOMemoryDescriptor into the desired number of bits. For instance if your hardware only supports 32 bits but must run on machines with > 4G of RAM some mapping will be required. Number of bits will be specified in numAddressBits, see below. This parameter can take 3 values:- kNonCoherent - used for non-coherent hardware transfers, Mapped - Validate that all I/O bus generated addresses are within the number of addressing bits specified, Bypassed indicates that bypassed addressing is required, this is used when the hardware transfers are into coherent memory but no mapping is required. See also prepare() for failure cases.
maxTransferSize
Maximum size of an entire transfer. Defaults to 0 indicating no maximum.
alignment
Alignment restriction, in bytes, on I/O bus addresses. Defaults to single byte alignment.
mapper
For mapping types kMapped & kBypassed mapper is used to define the hardware that will perform the mapping, defaults to the system mapper.
kIOReturnSuccess if everything is OK, otherwise kIOReturnBadArgument if newCommand is NULL, kIOReturnUnsupported if the kernel doesn't export IODMACommand or IOReturnError if the new command fails to init, q.v. initWithSpecification.
Factory function to create and initialise an IODMACommand in one operation. The function allows a developer to 'weak' link with IODMACommand. This function will return kIOReturnUnsupported if the IODMACommand is unavailable. This function is actually fairly slow so it will be better to call it once then clone the successfully create command using cloneCommand (q.v.).
withSpecification |
Creates and initializes an IODMACommand in one operation.
public
static IODMACommand * withSpecification( SegmentFunction outSegFunc, UInt8 numAddressBits, UInt64 maxSegmentSize, MappingOptions mappingOptions = kMapped, UInt64 maxTransferSize = 0, UInt32 alignment = 1, IOMapper *mapper = 0, void *refCon = 0);
outSegFunc
SegmentFunction to call to output one physical segment. A set of nine commonly required segment functions are provided.
numAddressBits
Number of bits that the hardware uses on its internal address bus. Typically 32 but may be more on modern hardware. A 0 implies no-restriction other than that implied by the output segment function.
maxSegmentSize
Maximum allowable size for one segment. If 0 is passed the maximum segment size is unlimited.
mappingOptions
is the type of mapping that is required to translate an IOMemoryDescriptor into the desired number of bits. For instance if your hardware only supports 32 bits but must run on machines with > 4G of RAM some mapping will be required. Number of bits will be specified in numAddressBits, see below.This parameter can take 3 values:- kNonCoherent - used for non-coherent hardware transfers, Mapped - Validate that all I/O bus generated addresses are within the number of addressing bits specified, Bypassed indicates that bypassed addressing is required, this is used when the hardware transferes are into coherent memory but no mapping is required. See also prepare() for failure cases.
maxTransferSize
Maximum size of an entire transfer. Defaults to 0 indicating no maximum.
alignment
Alignment restriction, in bytes, on I/O bus addresses. Defaults to single byte alignment.
mapper
For mapping types kMapped & kBypassed mapper is used to define the hardware that will perform the mapping, defaults to the system mapper.
Returns a new memory cursor if successfully created and initialized, 0 otherwise.
Factory function to create and initialize an IODMACommand in one operation.
writeBytes |
Copy data to the IODMACommand's buffer from the specified buffer.
public
UInt64 writeBytes( UInt64 offset, const void *bytes, UInt64 length);
offset
A byte offset into the IODMACommand's memory, relative to the prepared offset.
bytes
The caller supplied buffer to copy the data from.
length
The length of the data to copy.
The number of bytes copied, zero will be returned if the specified offset is beyond the prepared length of the IODMACommand.
This method copies data to the IODMACommand's memory at the given offset, from the caller's buffer. The IODMACommand must be prepared, and the offset is relative to the prepared offset.
Segment32 |
public
typedef bool ( *SegmentFunction)( IODMACommand *target, Segment64 segment, void *segments, UInt32 segmentIndex);
A 32 bit I/O bus address/length pair
See Also
SegmentFunction |
public
typedef bool ( *SegmentFunction)( IODMACommand *target, Segment64 segment, void *segments, UInt32 segmentIndex);
A 32 bit I/O bus address/length pair
See Also
SegmentFunction |
public
typedef bool ( *SegmentFunction)( IODMACommand *target, Segment64 segment, void *segments, UInt32 segmentIndex);
segment
The 64Bit I/O bus address and length.
segments
Base of the output vector of DMA address length pairs.
segmentIndex
Index to output 'segment' in the 'segments' array.
Returns true if segment encoding succeeded. false may be returned if the current segment does not fit in an output segment, i.e. a 38bit address wont fit into a 32 encoding.
Pointer to a C function that translates a 64 segment and outputs a single desired segment to the array at the requested index. There are a group of pre-implemented SegmentFunctions that may be usefull to the developer below.
Segment32 |
public
struct Segment32 { UInt32 fIOVMAddr, fLength; };
A 32 bit I/O bus address/length pair
See Also
Segment64 |
public
struct Segment64 { UInt64 fIOVMAddr, fLength; };
A 32 bit I/O bus address/length pair
See Also
fActive |
protected
UInt32 fActive;
fActive indicates that this DMA command is currently prepared and ready to go
fAlignMask |
protected
UInt32 fAlignMask;
Alignment restriction mask.
fBypassMask |
protected
UInt64 fBypassMask;
Mask to be ored into the address to bypass the given iommu's mapping.
fMapper |
protected
IOMapper *fMapper;
Client defined mapper.
fMappingOptions |
protected
MappingOptions fMappingOptions;
What type of I/O virtual address mapping is required for this command
fMaxSegmentSize |
protected
UInt64 fMaxSegmentSize;
Maximum size of one segment in a scatter/gather list
fMaxTransferSize |
protected
UInt64 fMaxTransferSize;
Maximum size of a transfer that this memory cursor is allowed to generate
fMemory |
protected
const IOMemoryDescriptor *fMemory;
memory descriptor for current I/O.
fNumAddressBits |
protected
UInt32 fNumAddressBits;
Number of bits that the hardware can address
fNumSegments |
protected
UInt32 fNumSegments;
Number of contiguous segments required for the current memory descriptor and desired mapping
fOutSeg |
protected
SegmentFunction fOutSeg;
The action method called when an event has been delivered
fRefCon |
public
void *fRefCon;
Reference Constant, client defined publicly avialable
reserved |
protected
struct IODMACommandInternal * reserved;
Reserved for future use. (Internal use only)
MappingOptions |
public
enum MappingOptions { kMapped = 0x00000000, kBypassed = 0x00000001, kNonCoherent = 0x00000002, kTypeMask = 0x0000000f, kNoCacheStore = 0x00000010, // Memory in descriptor kOnChip = 0x00000020, // Indicates DMA is on South Bridge kIterateOnly = 0x00000040 // DMACommand will be used as a cursor only };
A 32 bit I/O bus address/length pair
See Also
SynchronizeOptions |
public
enum SynchronizeOptions { kForceDoubleBuffer = 0x01000000 };
A 32 bit I/O bus address/length pair
See Also
Output big-endian Segment32 output segment function.
Output little-endian Segment64 output segment function.
Output big-endian Segment64 output segment function.
Output host natural Segment32 output segment function.
Output host natural Segment64 output segment function.
Output little-endian Segment32 output segment function.
Output little-endian Segment64 output segment function.
Output big-endian Segment64 output segment function.
kIODMACommandOutputBig32 |
Output big-endian Segment32 output segment function.
#define kIODMACommandOutputBig32
kIODMACommandOutputBig64 |
Output little-endian Segment64 output segment function.
#define kIODMACommandOutputBig64
See Also
kIODMACommandOutputBig64 |
Output big-endian Segment64 output segment function.
#define kIODMACommandOutputLittle64
See Also
kIODMACommandOutputHost32 |
Output host natural Segment32 output segment function.
#define kIODMACommandOutputHost32
kIODMACommandOutputHost64 |
Output host natural Segment64 output segment function.
#define kIODMACommandOutputHost64
kIODMACommandOutputLittle32 |
Output little-endian Segment32 output segment function.
#define kIODMACommandOutputLittle32
kIODMACommandOutputLittle64 |
Output little-endian Segment64 output segment function.
#define kIODMACommandOutputBig64
See Also
kIODMACommandOutputLittle64 |
Output big-endian Segment64 output segment function.
#define kIODMACommandOutputLittle64
See Also
Last Updated: 2010-07-29