func (h *HMD2043) Handler(s *cpu.Storage) {
switch s.A {
case QueryMediaPresent:
if h.media == nil {
s.A = ErrorNoMedia
s.B = 0
return
}
s.A, s.B = ErrorNone, 0
if isSupported(h.media) {
s.B = 1
}
case QueryMediaParams:
if h.media == nil {
s.A, s.B, s.C, s.X = ErrorNoMedia, 0, 0, 0
return
}
s.A = ErrorNone
s.B = h.media.SectorSize()
s.C = h.media.SectorCount()
s.X = 0
if h.media.WriteLocked() {
s.X = 1
}
case QueryDeviceFlags:
s.A, s.B = ErrorNone, h.flags
case UpdateDeviceFlags:
s.A, h.flags = ErrorNone, s.B
case QueryInterruptType:
s.A, s.B = ErrorNone, h.lastint
case SetInterruptId:
s.A, h.id = ErrorNone, s.B
case ReadSectors:
if h.media == nil {
s.A, s.B, s.C, s.X = ErrorNoMedia, 0, 0, 0
return
}
if h.busy {
return
}
h.busy = true
s.A = ErrorNone
if h.flags&NonBlocking == 0 {
err := h.media.Read(s.B, s.Mem[s.X:s.X+s.C])
if err != nil {
s.A = ErrorInvalidSector
}
h.busy = false
return
}
s.A = ErrorNone
go func() {
h.media.Read(s.B, s.Mem[s.X:s.X+s.C])
h.busy = false
h.lastint = TypeReadComplete
h.int(h.id)
}()
case WriteSectors:
if h.media == nil {
s.A, s.B, s.C, s.X = ErrorNoMedia, 0, 0, 0
return
}
if h.busy {
return
}
h.busy = true
if h.flags&NonBlocking == 0 {
err := h.media.Write(s.B, s.Mem[s.X:s.X+s.C])
if err != nil {
s.A = ErrorInvalidSector
}
h.busy = false
return
}
s.A = ErrorNone
go func() {
h.media.Write(s.B, s.Mem[s.X:s.X+s.C])
h.busy = false
h.lastint = TypeWriteComplete
h.int(h.id)
}()
case QueryMediaQuality:
if h.media == nil {
s.A, s.B, s.C, s.X = ErrorNoMedia, 0, 0, 0
return
}
if h.busy {
return
}
// TODO: Find some metric to determine if the type of media.
// The HMU1440 spec defines no manufacturer or device ids we can check.
// Assume AuthenticHITMedia for now.
s.A, s.B = ErrorNone, AuthenticHITMedia
}
}
