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Fix harddisk detection for seriously broken BIOS
svn path=/trunk/; revision=12197
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parent
e8861acfb2
commit
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@ -642,13 +642,33 @@ DetectBiosDisks(HKEY SystemKey,
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U32 Size;
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U32 Size;
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U32 i;
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U32 i;
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S32 Error;
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S32 Error;
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BOOL Changed;
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/* Count the number of visible drives */
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/* Count the number of visible drives */
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DiskReportError(FALSE);
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DiskReportError(FALSE);
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DiskCount = 0;
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DiskCount = 0;
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/* There are some really broken BIOSes out there. There are even BIOSes
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* that happily report success when you ask them to read from non-existent
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* harddisks. So, we set the buffer to known contents first, then try to
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* read. If the BIOS reports success but the buffer contents haven't
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* changed then we fail anyway */
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memset((PVOID) DISKREADBUFFER, 0xcd, 512);
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while (MachDiskReadLogicalSectors(0x80 + DiskCount, 0ULL, 1, (PVOID)DISKREADBUFFER))
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while (MachDiskReadLogicalSectors(0x80 + DiskCount, 0ULL, 1, (PVOID)DISKREADBUFFER))
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{
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{
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Changed = FALSE;
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for (i = 0; ! Changed && i < 512; i++)
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{
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Changed = ((PUCHAR)DISKREADBUFFER)[i] != 0xcd;
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}
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if (! Changed)
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{
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DbgPrint((DPRINT_HWDETECT, "BIOS reports success for disk %d but data didn't change\n",
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(int)DiskCount));
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break;
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}
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DiskCount++;
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DiskCount++;
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memset((PVOID) DISKREADBUFFER, 0xcd, 512);
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}
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}
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DiskReportError(TRUE);
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DiskReportError(TRUE);
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DbgPrint((DPRINT_HWDETECT, "BIOS reports %d harddisk%s\n",
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DbgPrint((DPRINT_HWDETECT, "BIOS reports %d harddisk%s\n",
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