/**
* 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;
}
/**
* Demand zero mmaps an area of virtual memory.
*
* @param start the address of the start of the area to be mapped
* @param size the size, in bytes, of the area to be mapped
* @return 0 if successful, otherwise the system errno
*/
public final int dzmmap(Address start, int size) {
Address result = org.jikesrvm.runtime.Memory.dzmmap(start, Extent.fromIntZeroExtend(size));
if (result.EQ(start)) return 0;
if (result.GT(Address.fromIntZeroExtend(127))) {
VM.sysWrite("demand zero mmap with MAP_FIXED on ", start);
VM.sysWriteln(" returned some other address", result);
VM.sysFail("mmap with MAP_FIXED has unexpected behavior");
}
return result.toInt();
}