/**
* Look for the ROM in the ISA region.
*
* @param rm
* @return The claimed ROM region, or null if not found.
*/
private final MemoryResource findRom(final ResourceOwner owner, final ResourceManager rm)
throws ResourceNotFreeException {
final MemoryScanner scanner =
AccessController.doPrivileged(
new PrivilegedAction<MemoryScanner>() {
public MemoryScanner run() {
return rm.getMemoryScanner();
}
});
final Address start = Address.fromIntZeroExtend(0xC0000);
final Address end = Address.fromIntZeroExtend(0xF0000);
final int size = end.toWord().sub(start.toWord()).toInt();
final int stepSize = 0x1000;
int offset = 0;
while (offset < size) {
final Address romAddr;
// Search for BIOS expansion
romAddr =
scanner.findInt8Array(
start.add(offset),
size - offset,
BIOS_ROM_SIGNATURE,
0,
BIOS_ROM_SIGNATURE.length,
stepSize);
if (romAddr == null) {
return null;
} else {
offset = romAddr.toWord().sub(start.toWord()).toInt() + stepSize;
}
// Search for ATI signature
final Address atiSigAddr;
atiSigAddr =
scanner.findInt8Array(romAddr, 128, ATI_ROM_SIGNATURE, 0, ATI_ROM_SIGNATURE.length, 1);
if (atiSigAddr == null) {
continue;
}
// We found it
// Claim a small region, so we can read the size.
MemoryResource mem;
mem = rm.claimMemoryResource(owner, romAddr, 4, ResourceManager.MEMMODE_NORMAL);
final int blocks = mem.getByte(2) & 0xFF;
final int romSize = blocks * 512;
mem.release();
log.info(
"Found ATI ROM at 0x"
+ NumberUtils.hex(romAddr.toInt())
+ " size="
+ NumberUtils.toBinaryByte(romSize));
return rm.claimMemoryResource(owner, romAddr, romSize, ResourceManager.MEMMODE_NORMAL);
}
return null;
}
/**
* Find the ACPI root descriptor table.
*
* @param rm
* @return
* @throws ResourceNotFreeException
*/
private static final AcpiRSDPInfo findAcpiRSDTPTR(final ResourceManager rm)
throws ResourceNotFreeException {
final byte[] match = {'R', 'S', 'D', ' ', 'P', 'T', 'R', ' '};
final MemoryScanner scanner =
(MemoryScanner)
AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
return rm.getMemoryScanner();
}
});
final Address tablePtr =
scanner.findInt8Array(
Address.fromIntZeroExtend(0xe0000), 0x1ffff, match, 0, match.length, 1);
if (tablePtr != null) {
final int version = getRSDTVersion(rm, tablePtr);
return new AcpiRSDPInfo(tablePtr, version);
} else {
// Not an ACPI system
return null;
}
}
