本文整理汇总了C++中IOBufferMemoryDescriptor::getPhysicalAddress方法的典型用法代码示例。如果您正苦于以下问题：C++ IOBufferMemoryDescriptor::getPhysicalAddress方法的具体用法？C++ IOBufferMemoryDescriptor::getPhysicalAddress怎么用？C++ IOBufferMemoryDescriptor::getPhysicalAddress使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类IOBufferMemoryDescriptor的用法示例。
在下文中一共展示了IOBufferMemoryDescriptor::getPhysicalAddress方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: IOMallocContiguous
void * IOMallocContiguous(vm_size_t size, vm_size_t alignment,
IOPhysicalAddress * physicalAddress)
{
mach_vm_address_t address = 0;
if (size == 0)
return 0;
if (alignment == 0)
alignment = 1;
/* Do we want a physical address? */
if (!physicalAddress)
{
address = IOKernelAllocateWithPhysicalRestrict(size, 0 /*maxPhys*/, alignment, true);
}
else do
{
IOBufferMemoryDescriptor * bmd;
mach_vm_address_t physicalMask;
vm_offset_t alignMask;
alignMask = alignment - 1;
physicalMask = (0xFFFFFFFF ^ alignMask);
bmd = IOBufferMemoryDescriptor::inTaskWithPhysicalMask(
kernel_task, kIOMemoryPhysicallyContiguous, size, physicalMask);
if (!bmd)
break;
_IOMallocContiguousEntry *
entry = IONew(_IOMallocContiguousEntry, 1);
if (!entry)
{
bmd->release();
break;
}
entry->virtualAddr = (mach_vm_address_t) bmd->getBytesNoCopy();
entry->md = bmd;
lck_mtx_lock(gIOMallocContiguousEntriesLock);
queue_enter( &gIOMallocContiguousEntries, entry,
_IOMallocContiguousEntry *, link );
lck_mtx_unlock(gIOMallocContiguousEntriesLock);
address = (mach_vm_address_t) entry->virtualAddr;
*physicalAddress = bmd->getPhysicalAddress();
}
while (false);
if (address) {
IOStatisticsAlloc(kIOStatisticsMallocContiguous, size);
}
return (void *) address;
}示例2: limit
IOBufferMemoryDescriptor *kXAudioEngine::my_alloc_contiguous(mach_vm_size_t size, void **addr, dword *phys)
{
if(size<PAGE_SIZE)
size=PAGE_SIZE;
#ifdef DEBUGGING
size += 2 * PAGE_SIZE;
#endif
//void *addr=IOMallocContiguous(size+PAGE_SIZE+PAGE_SIZE,alignment,phys);
mach_vm_address_t mask = 0x000000007FFFFFFFULL & ~(PAGE_SIZE - 1);
IOBufferMemoryDescriptor *desc =
IOBufferMemoryDescriptor::inTaskWithPhysicalMask(
kernel_task,
kIODirectionInOut | kIOMemoryPhysicallyContiguous,
size,
mask);
if(desc)
{
desc->prepare();
IOPhysicalAddress pa = desc->getPhysicalAddress();
if (pa & ~mask)
debug("kXAudioEngine[%p]::my_alloc_contiguous() - memory misaligned or beyond 2GB limit (%p)\n", this, (void *)pa);
*phys = (dword)pa;
*addr = desc->getBytesNoCopy();
#ifdef DEBUGGING
memset(addr,0x11,PAGE_SIZE);
memset((UInt8 *)addr+PAGE_SIZE+size,0x22,PAGE_SIZE);
*((UInt8 *)addr) += PAGE_SIZE;
*phys += PAGE_SIZE;
#endif
}
else
debug("kXAudioEngine[%p]::my_alloc_contiguous() - allocation failed\n",this);
return desc;
}