internal IntelRingBuffer(uint capacity)
//requires capacity > 0 && IsPowerOf2(capacity);
{
uint length = capacity * DescriptorBytes;
DmaMemory region = new DmaMemory((int)length); //TODO: DmaMemory.AllocatePhysical(length, AlignmentBytes);
// (ARM only, not x86) PlatformService.SetCacheAttributes(region.VirtualAddress,
// (UIntPtr)region.Length,
// false,
// false);
this.region = region;
this.mapEntries = new MapEntry [capacity];
for (int i = 0; i < capacity; i++) {
this.mapEntries[i].mem = new DmaMemory((int)Intel.IEEE8023FrameBytes);
}
this.capacity = capacity;
this.head = 0;
this.tail = 0;
this.count = 0;
// Clear out ring buffer
for (int i = 0; i < region.Length; i += 4) {
region.Write32(i, 0);
}
}
