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Wengier 2020-06-16 09:35:20 -04:00 committed by GitHub
parent b8578218b0
commit f5707a2987
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1 changed files with 27 additions and 19 deletions
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28
src/dos/dos_programs.cpp
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@ -4519,16 +4519,24 @@ private:
bool DetectMFMsectorPartition(Bit8u buf[], Bit32u fcsize, Bitu sizes[]) { bool DetectMFMsectorPartition(Bit8u buf[], Bit32u fcsize, Bitu sizes[]) {
// This is used for plain MFM sector format as created by IMGMAKE // This is used for plain MFM sector format as created by IMGMAKE
Bit8u starthead = 0; // It tries to find the first partition. Addressing is in CHS format.
Bit8u startsect = 0; /* Offset | Length | Description
Bit16u startcyl = 0; * +0 | 1 byte | 80 hex = active, 00 = inactive
Bit16u endcyl = 0; * +1 | 3 bytes | CHS of first sector in partition
* +4 | 1 byte | partition type
* +5 | 3 bytes | CHS of last sector in partition
* +8 | 4 bytes | LBA of first sector in partition
* +C | 4 bytes | Number of sectors in partition. 0 may mean, use LBA
*/
Bit8u starthead = 0; // start head of partition
Bit8u startsect = 0; // start sector of partition
Bit16u startcyl = 0; // start cylinder of partition
Bit8u ptype = 0; // Partition Type Bit8u ptype = 0; // Partition Type
Bit8u heads = 0; Bit16u endcyl = 0; // end cylinder of partition
Bit8u sectors = 0; Bit8u heads = 0; // heads in partition
Bitu pe1_size = host_readd(&buf[0x1ca]); Bit8u sectors = 0; // sectors per track in partition
(void)ptype;//unused Bit32u pe1_size = host_readd(&buf[0x1ca]);
if ((Bit16u)host_readd(&buf[0x1fa]) != 0) { // DOS 2.0-3.21 partition table if ((Bit32u)host_readd(&buf[0x1fa]) != 0) { // DOS 2.0-3.21 partition table
pe1_size = host_readd(&buf[0x1fa]); pe1_size = host_readd(&buf[0x1fa]);
starthead = buf[0x1ef]; starthead = buf[0x1ef];
startsect = (buf[0x1f0] & 0x3fu) - 1u; startsect = (buf[0x1f0] & 0x3fu) - 1u;
@ -4537,7 +4545,7 @@ private:
ptype = buf[0x1f2]; ptype = buf[0x1f2];
heads = buf[0x1f3] + 1u; heads = buf[0x1f3] + 1u;
sectors = buf[0x1f4] & 0x3fu; sectors = buf[0x1f4] & 0x3fu;
} else if (pe1_size != 0) { // DOS 3.3+ partition table } else if (pe1_size != 0) { // DOS 3.3+ partition table, starting at 0x1BE
starthead = buf[0x1bf]; starthead = buf[0x1bf];
startsect = (buf[0x1c0] & 0x3fu) - 1u; startsect = (buf[0x1c0] & 0x3fu) - 1u;
startcyl = (unsigned char)buf[0x1c1] | (unsigned int)((buf[0x1c0] & 0xc0) << 2u); startcyl = (unsigned char)buf[0x1c1] | (unsigned int)((buf[0x1c0] & 0xc0) << 2u);