private void initialise()
{
m_isPlaying = state_t.STOPPED;
m_c64.reset();
sidplayfp.SidTuneInfo tuneInfo = m_tune.getInfo();
UInt32 size = (UInt32)(tuneInfo.loadAddr()) + tuneInfo.c64dataLen() - 1;
if (size > 0xffff)
{
throw new configError(ERR_UNSUPPORTED_SIZE);
}
psiddrv driver = new psiddrv(m_tune.getInfo());
if (!driver.drvReloc())
{
throw new configError(driver.errorString());
}
m_info.m_driverAddr = driver.driverAddr();
m_info.m_driverLength = driver.driverLength();
sidmemory sm = m_c64.getMemInterface();
driver.install(ref sm, videoSwitch);
sm = m_c64.getMemInterface();
if (!m_tune.placeSidTuneInC64mem(ref sm))
{
throw new configError(m_tune.statusString());
}
m_c64.resetCpu();
//Console.WriteLine("{0:x}", sm.readMemByte(0x17e3));
}
public bool drvReloc()
{
Int32 startlp = m_tuneInfo.loadAddr() >> 8;
Int32 endlp = (Int32)((m_tuneInfo.loadAddr() + (m_tuneInfo.c64dataLen() - 1)) >> 8);
byte relocStartPage = m_tuneInfo.relocStartPage();
byte relocPages = m_tuneInfo.relocPages();
if (m_tuneInfo.compatibility() == sidplayfp.SidTuneInfo.compatibility_t.COMPATIBILITY_BASIC)
{
// The psiddrv is only used for initialisation and to
// autorun basic tunes as running the kernel falls
// into a manual load/run mode
relocStartPage = 0x04;
relocPages = 0x03;
}
// Check for free space in tune
if (relocStartPage == 0xff)
{
relocPages = 0;
}
// Check if we need to find the reloc addr
else if (relocStartPage == 0)
{
relocPages = 0;
// find area where to dump the driver in.
// It's only 1 block long, so any free block we can find
// between $0400 and $d000 will do.
for (int i = 4; i < 0xd0; i++)
{
if (i >= startlp && i <= endlp)
{
continue;
}
if (i >= 0xa0 && i <= 0xbf)
{
continue;
}
relocStartPage = (byte)i;
relocPages = 1;
break;
}
}
if (relocPages < 1)
{
m_errorString = ERR_PSIDDRV_NO_SPACE;
return(false);
}
// Place psid driver into ram
UInt16 relocAddr = (UInt16)(relocStartPage << 8);
reloc_driver = psid_driver;
reloc_size = psid_driver.Length;
reloc65 relocator = new reloc65();
relocator.setReloc(reloc65.segment_t.TEXT, relocAddr - 10);
relocator.setExtract(reloc65.segment_t.TEXT);
if (!relocator.reloc(ref reloc_driver, ref reloc_size))
{
m_errorString = ERR_PSIDDRV_RELOC;
return(false);
}
// Adjust size to not included initialisation data.
reloc_size -= 10;
m_driverAddr = relocAddr;
m_driverLength = (UInt16)reloc_size;
// Round length to end of page
m_driverLength += 0xff;
m_driverLength &= 0xff00;
return(true);
}