AppleEHCIitdMemoryBlock*
AppleEHCIitdMemoryBlock::NewMemoryBlock(void)
{
AppleEHCIitdMemoryBlock *me = new AppleEHCIitdMemoryBlock;
IOByteCount len;
IODMACommand *dmaCommand = NULL;
UInt64 offset = 0;
IODMACommand::Segment32 segments;
UInt32 numSegments = 1;
IOReturn status = kIOReturnSuccess;
if (me)
{
// Use IODMACommand to get the physical address
dmaCommand = IODMACommand::withSpecification(kIODMACommandOutputHost32, 32, PAGE_SIZE, (IODMACommand::MappingOptions)(IODMACommand::kMapped | IODMACommand::kIterateOnly));
if (!dmaCommand)
{
USBError(1, "AppleEHCIitdMemoryBlock::NewMemoryBlock - could not create IODMACommand");
return NULL;
}
USBLog(6, "AppleEHCIitdMemoryBlock::NewMemoryBlock - got IODMACommand %p", dmaCommand);
// allocate one page on a page boundary below the 4GB line
me->_buffer = IOBufferMemoryDescriptor::inTaskWithPhysicalMask(kernel_task, kIOMemoryUnshared | kIODirectionInOut, kEHCIPageSize, kEHCIStructureAllocationPhysicalMask);
// allocate exactly one physical page
if (me->_buffer)
{
status = me->_buffer->prepare();
if (status)
{
USBError(1, "AppleEHCIitdMemoryBlock::NewMemoryBlock - could not prepare buffer");
me->_buffer->release();
me->_buffer = NULL;
me->release();
dmaCommand->release();
return NULL;
}
me->_sharedLogical = (EHCIIsochTransferDescriptorSharedPtr)me->_buffer->getBytesNoCopy();
bzero(me->_sharedLogical, kEHCIPageSize);
status = dmaCommand->setMemoryDescriptor(me->_buffer);
if (status)
{
USBError(1, "AppleEHCIitdMemoryBlock::NewMemoryBlock - could not set memory descriptor");
me->_buffer->complete();
me->_buffer->release();
me->_buffer = NULL;
me->release();
dmaCommand->release();
return NULL;
}
status = dmaCommand->gen32IOVMSegments(&offset, &segments, &numSegments);
dmaCommand->clearMemoryDescriptor();
dmaCommand->release();
if (status || (numSegments != 1) || (segments.fLength != kEHCIPageSize))
{
USBError(1, "AppleEHCIitdMemoryBlock::NewMemoryBlock - could not get physical segment");
me->_buffer->complete();
me->_buffer->release();
me->_buffer = NULL;
me->release();
return NULL;
}
me->_sharedPhysical = segments.fIOVMAddr;
}
else
{
USBError(1, "AppleEHCIitdMemoryBlock::NewMemoryBlock, could not allocate buffer!");
me->release();
me = NULL;
}
}
else
{
USBError(1, "AppleEHCIitdMemoryBlock::NewMemoryBlock, constructor failed!");
}
return me;
}
IOReturn AppleSamplePCI::generateDMAAddresses( IOMemoryDescriptor * memDesc )
{
// Get the physical segment list. These could be used to generate a scatter gather
// list for hardware.
// This is the old getPhysicalSegment() loop calling IOMemoryDescriptor,
// it will fail (panic) on new machines with memory above the 4Gb line
IODMACommand * cmd;
IOReturn err = kIOReturnSuccess;
IOByteCount offset = 0;
IOPhysicalAddress physicalAddr;
IOPhysicalLength segmentLength;
UInt32 index = 0;
while( (physicalAddr = memDesc->getPhysicalSegment( offset, &segmentLength ))) {
IOLog("Physical segment(%ld) %08lx:%08lx\n", index, physicalAddr, segmentLength);
offset += segmentLength;
index++;
}
// 64 bit physical address generation using IODMACommand
do
{
cmd = IODMACommand::withSpecification(
// outSegFunc - Host endian since we read the address data with the cpu
// and 64 bit wide quantities
kIODMACommandOutputHost64,
// numAddressBits
64,
// maxSegmentSize - zero for unrestricted physically contiguous chunks
0,
// mappingOptions - kMapped for DMA addresses
IODMACommand::kMapped,
// maxTransferSize - no restriction
0,
// alignment - no restriction
1 );
if (!cmd)
{
IOLog("IODMACommand::withSpecification failed\n");
break;
}
// point at the memory descriptor and use the auto prepare option
// to prepare the entire range
err = cmd->setMemoryDescriptor(memDesc);
if (kIOReturnSuccess != err)
{
IOLog("setMemoryDescriptor failed (0x%x)\n", err);
break;
}
UInt64 offset = 0;
while ((kIOReturnSuccess == err) && (offset < memDesc->getLength()))
{
// use the 64 bit variant to match outSegFunc
IODMACommand::Segment64 segments[1];
UInt32 numSeg = 1;
// use the 64 bit variant to match outSegFunc
err = cmd->gen64IOVMSegments(&offset, &segments[0], &numSeg);
IOLog("gen64IOVMSegments(%x) addr 0x%qx, len 0x%qx, nsegs %ld\n",
err, segments[0].fIOVMAddr, segments[0].fLength, numSeg);
}
// if we had a DMA controller, kick off the DMA here
// when the DMA has completed,
// clear the memory descriptor and use the auto complete option
// to complete the transaction
err = cmd->clearMemoryDescriptor();
if (kIOReturnSuccess != err)
{
IOLog("clearMemoryDescriptor failed (0x%x)\n", err);
}
}
while (false);
if (cmd)
cmd->release();
// end 64 bit loop
// 32 bit physical address generation using IODMACommand
// any memory above 4Gb in the memory descriptor will be buffered
// to memory below the 4G line, on machines without remapping HW support
do
{
cmd = IODMACommand::withSpecification(
// outSegFunc - Host endian since we read the address data with the cpu
// and 32 bit wide quantities
kIODMACommandOutputHost32,
// numAddressBits
32,
// maxSegmentSize - zero for unrestricted physically contiguous chunks
0,
// mappingOptions - kMapped for DMA addresses
IODMACommand::kMapped,
// maxTransferSize - no restriction
0,
// alignment - no restriction
1 );
if (!cmd)
{
IOLog("IODMACommand::withSpecification failed\n");
break;
}
// point at the memory descriptor and use the auto prepare option
// to prepare the entire range
err = cmd->setMemoryDescriptor(memDesc);
if (kIOReturnSuccess != err)
{
IOLog("setMemoryDescriptor failed (0x%x)\n", err);
break;
}
UInt64 offset = 0;
while ((kIOReturnSuccess == err) && (offset < memDesc->getLength()))
{
// use the 32 bit variant to match outSegFunc
IODMACommand::Segment32 segments[1];
UInt32 numSeg = 1;
// use the 32 bit variant to match outSegFunc
err = cmd->gen32IOVMSegments(&offset, &segments[0], &numSeg);
IOLog("gen32IOVMSegments(%x) addr 0x%lx, len 0x%lx, nsegs %ld\n",
err, segments[0].fIOVMAddr, segments[0].fLength, numSeg);
}
// if we had a DMA controller, kick off the DMA here
// when the DMA has completed,
// clear the memory descriptor and use the auto complete option
// to complete the transaction
err = cmd->clearMemoryDescriptor();
if (kIOReturnSuccess != err)
{
IOLog("clearMemoryDescriptor failed (0x%x)\n", err);
}
}
while (false);
if (cmd)
cmd->release();
// end 32 bit loop
return (err);
}