func (memory *MemoryMap) Reserve(
vm *platform.Vm,
device Device,
memtype MemoryType,
start platform.Paddr,
size uint64,
user []byte) error {
// Verbose messages.
device.Debug(
"reserving (type: %d) of size %x in [%x,%x]",
memtype,
size,
start,
start.After(size-1))
// Ensure all targets are aligned.
if (start.Align(platform.PageSize, false) != start) ||
(size%platform.PageSize != 0) {
return MemoryUnaligned
}
// Ensure underlying map is aligned.
// This may be harder to detect later on.
if user != nil &&
uintptr(unsafe.Pointer(&user[0]))%platform.PageSize != 0 {
return MemoryUnaligned
}
// Add the region.
region := &TypedMemoryRegion{
MemoryRegion: MemoryRegion{start, size},
MemoryType: memtype,
Device: device,
user: user,
allocated: make(map[uint64]uint64),
}
err := memory.Add(region)
if err != nil {
return err
}
// Do the mapping.
switch region.MemoryType {
case MemoryTypeUser:
err = vm.MapUserMemory(region.Start, region.Size, region.user)
case MemoryTypeReserved:
err = vm.MapReservedMemory(region.Start, region.Size)
case MemoryTypeAcpi:
err = vm.MapUserMemory(region.Start, region.Size, region.user)
case MemoryTypeSpecial:
err = vm.MapSpecialMemory(region.Start)
}
return err
}
func (model *Model) Handle(
vm *platform.Vm,
cache *IoCache,
handler *IoHandler,
ioevent IoEvent,
addr platform.Paddr) error {
if handler != nil {
// Our offset from handler start.
offset := addr.OffsetFrom(handler.start)
// Submit our function.
err := handler.queue.Submit(ioevent, offset)
// Should we save this request?
if ioevent.IsWrite() && err == SaveIO {
err = cache.save(
vm,
addr,
handler,
ioevent,
offset)
}
// Return to our vcpu.
return err
} else if !ioevent.IsWrite() {
// Invalid reads return all 1's.
switch ioevent.Size() {
case 1:
ioevent.SetData(0xff)
case 2:
ioevent.SetData(0xffff)
case 4:
ioevent.SetData(0xffffffff)
case 8:
ioevent.SetData(0xffffffffffffffff)
}
}
return nil
}
func (region *MemoryRegion) Contains(start platform.Paddr, size uint64) bool {
return region.Start <= start && region.End() >= start.After(size)
}
func (region *MemoryRegion) Overlaps(start platform.Paddr, size uint64) bool {
return ((region.Start >= start && region.Start < start.After(size)) ||
(region.End() > start && region.End() <= start.After(size)))
}