internal void Start(ushort pitTicks)
{
CWPort.Write8(i8254_CW_MODE2 | i8254_CW_BOTH | i8254_CW_SEL2);
C2Port.Write8((byte)(pitTicks & 0xff));
C2Port.Write8((byte)(pitTicks >> 8));
do
{
CWPort.Write8(i8254_RB_NOCOUNT | i8254_RB_SEL2);
} while ((C2Port.Read8() & i8254_RB_NULL) == i8254_RB_NULL);
}
internal int PitRead()
{
CWPort.Write8(i8254_RB_ALL | i8254_RB_SEL0);
byte status = C0Port.Read8();
int pit1 = (int)C0Port.Read8() | ((int)C0Port.Read8() << 8);
// Extend pit value using i8254 output bit
if ((status & i8254_RB_OUT) == 0 ||
(pit1 == 0 && interruptPending == true))
{
pit1 += PitInterruptThreshold;
}
return(pit1);
}
// Constructor
internal Timer8254LegacyPC(PnpConfig config, Pic pic)
{
#if VERBOSE
Tracing.Log(Tracing.Debug, "Timer8254: create");
#endif
// /pnp/08/02/01/PNP0100 0003 cfg dis : ISA 8254 Timer : AT Timer
// IRQ mask=0001 type=47
// I/O Port inf=01 min=0040 max=0040 aln=01 len=04 0040..0043
this.config = config;
this.pic = pic;
this.irq = ((IoIrqRange)config.DynamicRanges[1]).Irq;
IoPortRange ioPorts = (IoPortRange)config.DynamicRanges[0];
C0Port = ioPorts.PortAtOffset(i8254_C0, 1, Access.ReadWrite);
C2Port = ioPorts.PortAtOffset(i8254_C2, 1, Access.ReadWrite);
CWPort = ioPorts.PortAtOffset(i8254_CW, 1, Access.ReadWrite);
// Enable Timer2
// Lower 2 bits of port 61 are described in:
// The Indispensable PC Hardware Book (3rd Edition) p.724
ioPorts = (IoPortRange)config.FixedRanges[0];
IoPort p = ioPorts.PortAtOffset(0, 1, Access.ReadWrite);
//
// Also clear the NMI RAM parity error to enable the PCI card
// to generate NMI if the button is depressed
//
p.Write8((byte)((p.Read8() & 0xf8) | 0x01));
}
public byte Read8(AcpiObject.RegionSpace regionSpace, ulong offset)
{
byte result;
switch (regionSpace)
{
case AcpiObject.RegionSpace.SystemMemory:
// TODO: This is a first stab - ideally the AcpiObject.OperationRegion
// ought to be holding onto an IoMemoryRange and passing it in repeatedly.
IoMemory region = IoMemory.MapPhysicalMemory(offset, 1, true /*readable*/, false /*writable*/);
result = region.Read8(0);
break;
case AcpiObject.RegionSpace.SystemIO:
IoPort port = new IoPort((ushort)offset, 1, Access.Read);
result = port.Read8();
break;
case AcpiObject.RegionSpace.PCI_Config:
pciConfigAddressPort.Write32(PciConfigEnableMask | (uint)offset);
result = pciConfigDataPort.Read8();
break;
default:
throw new Exception("Unimplemented operation region type" + regionSpace);
}
#if DUMP_RAW_READ_WRITES
DebugStub.WriteLine("ACPI read: space: " + regionSpace + ", offset: " + offset + ", bytes: " + 1 + ", result: " + result.ToString("X"));
#endif
return(result);
}
// Constructor
internal Timer8254Apic(PnpConfig config)
{
// /pnp/08/02/01/PNP0100 0003 cfg dis : ISA 8254 Timer : AT Timer
// IRQ mask=0001 type=47
// I/O Port inf=01 min=0040 max=0040 aln=01 len=04 0040..0043
this.config = config;
this.irq = ((IoIrqRange)config.DynamicRanges[1]).Irq;
IoPortRange ioPorts = (IoPortRange)config.DynamicRanges[0];
C2Port = ioPorts.PortAtOffset(i8254_C2, 1, Access.ReadWrite);
CWPort = ioPorts.PortAtOffset(i8254_CW, 1, Access.ReadWrite);
// Use Timer2 as it's not connected as interrupt source.
//
// Lower 2 bits of port 61 are described in:
// The Indispensable PC Hardware Book (3rd Edition) p.724
ioPorts = (IoPortRange)config.FixedRanges[0];
IoPort p = ioPorts.PortAtOffset(0, 1, Access.ReadWrite);
//
// Also clear the NMI RAM parity error to enable the PCI card
// to generate NMI if the button is depressed
//
p.Write8((byte)((p.Read8() & 0xf8) | 0x01));
}
private void DumpRegisters()
{
pic0CtrlPort.Write8(0x04 | 0x02); // OCW3 - read IRR
byte irr0 = pic0CtrlPort.Read8();
pic0CtrlPort.Write8(0x04 | 0x03); // OCW3 - read ISR
byte isr0 = pic0CtrlPort.Read8();
pic1CtrlPort.Write8(0x04 | 0x02); // OCW3 - read IRR
byte irr1 = pic1CtrlPort.Read8();
pic1CtrlPort.Write8(0x04 | 0x03); // OCW3 - read ISR
byte isr1 = pic1CtrlPort.Read8();
byte mask0 = pic0MaskPort.Read8();
byte mask1 = pic1MaskPort.Read8();
DebugStub.Print("PIC IRR: {0:x2}{1:x2} ISR: {2:x2}{3:x2} Mask:{4:x2}{5:x2}\n",
__arglist(irr1, irr0, isr1, isr0, mask1, mask0));
}
//
private void VgaTextMode()
{
// start sync reset program up sequencer
IndxOut(seqAddrPort, new byte[] { 0x01,0x00,0x03,0x00,0x02 } );
miscOutputRegWritePort.Write8(0x67);
graphAddrPort.Write16(0x0e06);
// EndSyncResetCmd
seqAddrPort.Write16(0x0300);
// Unlock the CTC registers.
crtcAddressColorPort.Write16(0x0E11);
// program crtc registers
IndxOut(crtcAddressColorPort, new byte[] { 0x5F,0x4f,0x50,0x82,0x55,0x81,
0xbf,0x1f,0x00,0x4f,0x0d,0x0e,
0x00,0x00,0x00,0x00,0x9c,0x8e,
0x8f,0x28,0x1f,0x96,0xb9,0xa3,
0xFF } );
// prepare atc for writing
inputStatusColorPort.Read8();
AtcOut(atcAddrPort, new byte[] { 0x00,0x01,0x02,0x03,0x04,0x05,0x14,0x07,
0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x04,0x00,0x0F,0x08,0x00 } );
// program graphics controller registers
IndxOut(graphAddrPort, new byte[] { 0x00,0x00,0x00,0x00,0x00,0x10,0x0e,0x00,0xff});
// DAC mask registers
dacPixelMaskPort.Write8(0xFF);
// prepare atc for writing
inputStatusColorPort.Read8();
// turn video on.
atcAddrPort.Write8(VIDEO_ENABLE);
}
} // BmArm
public byte GetStatus()
{
byte status = statusPort.Read8();
return(status);
}
