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-rw-r--r--perl-install/partition_table_raw.pm171
1 files changed, 72 insertions, 99 deletions
diff --git a/perl-install/partition_table_raw.pm b/perl-install/partition_table_raw.pm
index 70bb99fd4..d85789a50 100644
--- a/perl-install/partition_table_raw.pm
+++ b/perl-install/partition_table_raw.pm
@@ -3,126 +3,99 @@ package partition_table_raw;
use diagnostics;
use strict;
-use common qw(:common :system :file);
-use devices;
+use common qw(:common :system);
use c;
-my @MBR_signatures = (
- [ 'empty', 0, "\0\0\0\0" ],
- [ 'grub', 0, "\xEBG", 0x17d, "stage1 \0" ],
- [ 'grub', 0, "\xEBH", 0x18a, "stage1 \0" ],
- [ 'lilo', 0x2, "LILO" ],
- [ 'lilo', 0x6, "LILO" ],
- [ 'osbs', 0x2, "OSBS" ], #- http://www.prz.tu-berlin.de/~wolf/os-bs.html
- [ 'pqmagic', 0xef, "PQV" ],
- [ 'BootStar', 0x130, "BootStar:" ],
- [ 'DocsBoot', 0x148, 'DocsBoot' ],
- [ 'system_commander', 0x1ad, "SYSCMNDRSYS" ],
- [ 'Be Os', 0x24, 'Boot Manager' ],
- [ 'TimO', 0, 'IBM Thinkpad hibernation partition' ],
- [ 'dos', 0xa0, "\x25\x03\x4E\x02\xCD\x13" ],
- [ 'dos', 0xa0, "\x00\xB4\x08\xCD\x13\x72" ], #- nt2k's
- [ 'dos', 0x60, "\xBB\x00\x7C\xB8\x01\x02\x57\xCD\x13\x5F\x73\x0C\x33\xC0\xCD\x13" ], #- nt's
- [ 'dos', 0x70, "\x0C\x33\xC0\xCD\x13\x4F\x75\xED\xBE\xA3" ],
- [ 'freebsd', 0xC0, "\x00\x30\xE4\xCD\x16\xCD\x19\xBB\x07\x00\xB4" ],
- [ 'freebsd', 0x160, "\x6A\x10\x89\xE6\x48\x80\xCC\x40\xCD\x13" ],
- [ 'dummy', 0xAC, "\x0E\xB3\x07\x56\xCD\x10\x5E\xEB" ], #- caldera?
- [ 'ranish', 0x100, "\x6A\x10\xB4\x42\x8B\xF4\xCD\x13\x8B\xE5\x73" ],
- [ 'os2', 0x1c2, "\xA" ],
-);
-
-sub typeOfMBR($) { typeFromMagic(devices::make($_[0]), @MBR_signatures) }
-sub typeOfMBR_($) { typeFromMagic($_[0], @MBR_signatures) }
-
-sub hasExtended { 0 }
-
-sub cylinder_size($) {
- my ($hd) = @_;
- $hd->{geom}{sectors} * $hd->{geom}{heads};
+my @fields = qw(active start_head start_sec start_cyl type end_head end_sec end_cyl start size);
+my $format = "C8 I2";
+my $magic = "\x55\xAA";
+my $nb_primary = 4;
+
+my $offset = $common::SECTORSIZE - length($magic) - $nb_primary * common::psizeof($format);
+
+1;
+
+
+sub compute_CHS($$) {
+ my ($hd, $e) = @_;
+ my @l = qw(cyl head sec);
+ @$e{map { "start_$_" } @l} = $e->{start} || $e->{type} ? CHS2rawCHS(sector2CHS($hd, $e->{start})) : (0,0,0);
+ @$e{map { "end_$_" } @l} = $e->{start} || $e->{type} ? CHS2rawCHS(sector2CHS($hd, $e->{start} + $e->{size} - 1)) : (0,0,0);
+ 1;
}
-#- default method for starting a partition, only head size or twice
-#- is allowed for starting a partition after a cylinder boundarie.
-sub adjustStart($$) {
- my ($hd, $part) = @_;
- my $end = $part->{start} + $part->{size};
-
- $part->{start} = round_up($part->{start},
- $part->{start} % cylinder_size($hd) < 2 * $hd->{geom}{sectors} ?
- $hd->{geom}{sectors} : cylinder_size($hd));
- $part->{size} = $end - $part->{start};
- $part->{size} > 0 or die "adjustStart get a too small partition to handle correctly";
+sub CHS2rawCHS($$$) {
+ my ($c, $h, $s) = @_;
+ $c = min($c, 1023); # no way to have a #cylinder >= 1024
+ ($c & 0xff, $h, $s | ($c >> 2 & 0xc0));
}
-#- adjusting end to match a cylinder boundary, two methods are used and must
-#- match at the end, else something is wrong and nothing will be done on
-#- partition table.
-#- $end2 is computed by removing 2 (or only 1 if only 2 heads on drive) groups
-#- of sectors, this is necessary to handle extended partition where logical
-#- partition start after 1 (or 2 accepted) groups of sectors (typically 63).
-#- $end is floating (is not on cylinder boudary) so we have to choice a good
-#- candidate, $end1 or $end2 should always be good except $end1 for small
-#- partition size.
-sub adjustEnd($$) {
- my ($hd, $part) = @_;
- my $end = $part->{start} + $part->{size};
- my $end1 = round_down($end, cylinder_size($hd));
- my $end2 = round_up($end - ($hd->{geom}{heads} > 2 ? 2 : 1) * $hd->{geom}{sectors}, cylinder_size($hd));
- $end2 <= $hd->{geom}{cylinders} * cylinder_size($hd) or die "adjustEnd go beyond end of device geometry ($end2 > $hd->{totalsectors})";
- $part->{size} = ($end1 - $part->{start} > cylinder_size($hd) ? $end1 : $end2) - $part->{start};
- $part->{size} > 0 or die "adjustEnd get a too small partition to handle correctly";
+
+# returns (cylinder, head, sector)
+sub sector2CHS($$) {
+ my ($hd, $start) = @_;
+ my ($s, $h);
+ ($start, $s) = divide($start, $hd->{geom}->{sectors});
+ ($start, $h) = divide($start, $hd->{geom}->{heads});
+ ($start, $h, $s + 1);
}
sub get_geometry($) {
my ($dev) = @_;
my $g = "";
-
+
local *F; sysopen F, $dev, 0 or return;
ioctl(F, c::HDIO_GETGEO(), $g) or return;
- my %geom; @geom{qw(heads sectors cylinders start)} = unpack "CCSL", $g;
- $geom{totalcylinders} = $geom{cylinders};
- #- $geom{cylinders} is no good (only a ushort, that means less than 2^16 => at best 512MB)
- if (my $total = c::total_sectors(fileno F)) {
- $geom{cylinders} = int $total / $geom{heads} / $geom{sectors};
- }
+ my %geom; @geom{qw(heads sectors cylinders start)} = unpack "CCSL", $g;
{ geom => \%geom, totalsectors => $geom{heads} * $geom{sectors} * $geom{cylinders} };
}
-#- works for both hard drives and partitions ;p
-sub description {
- my ($hd) = @_;
- my $win = $hd->{device_windobe};
+sub openit($$;$) { sysopen $_[1], $_[0]->{file}, $_[2] || 0; }
- sprintf "%s%s (%d%s%s)",
- $hd->{device},
- $win && " [$win:]",
- ($hd->{totalsectors} || $hd->{size}) >> 11, _("MB"),
- $hd->{info} && ", $hd->{info}";
-}
-
-sub openit($$;$) { sysopen $_[1], $_[0]{file}, $_[2] || 0; }
-
-# cause kernel to re-read partition table
+# cause kernel to re-read partition table
sub kernel_read($) {
my ($hd) = @_;
- sync();
- local *F; openit($hd, *F) or return 0;
- sync(); sleep(1);
- $hd->{rebootNeeded} = !ioctl(F, c::BLKRRPART(), 0);
- sync();
- close F;
- sync(); sleep(1);
+ local *F; openit($hd, \*F) or return 0;
+ ioctl(F, c::BLKRRPART(), 0) or die "kernel_read failed: need to reboot";
}
-sub zero_MBR($) {
- my ($hd) = @_;
- #- force the standard partition type for the architecture
- my $type = arch() eq "alpha" ? "bsd" : arch() =~ /^sparc/ ? "sun" : arch() eq "ppc" ? "mac" : "dos";
- bless $hd, "partition_table_$type";
- $hd->{isDirty} = $hd->{needKernelReread} = 1;
- $hd->{primary} = $hd->clear_raw();
- delete $hd->{extended};
+sub read($$) {
+ my ($hd, $sector) = @_;
+ my $tmp;
+
+ local *F; openit($hd, \*F) or return;
+ c::lseek_sector(fileno(F), $sector, $offset) or die "reading of partition in sector $sector failed";
+
+ my @pt = map {
+ sysread F, $tmp, psizeof($format) or return "error while reading partition table in sector $sector";
+ my %h; @h{@fields} = unpack $format, $tmp;
+ \%h;
+ } (1..$nb_primary);
+
+ # check magic number
+ sysread F, $tmp, length $magic or die "error reading magic number";
+ $tmp eq $magic or die "bad magic number";
+
+ [ @pt ];
}
-1;
+# write the partition table (and extended ones)
+# for each entry, it uses fields: start, size, type, active
+sub write($$$) {
+ my ($hd, $sector, $pt) = @_;
+
+ local *F; openit($hd, \*F, 2) or die "error opening device $hd->{device} for writing";
+ c::lseek_sector(fileno(F), $sector, $offset) or return 0;
+
+ @$pt == $nb_primary or die "partition table does not have $nb_primary entries";
+ foreach (@$pt) {
+ compute_CHS($hd, $_);
+ local $_->{start} = $_->{local_start} || 0;
+ $_->{active} ||= 0; $_->{type} ||= 0; $_->{size} ||= 0; # for no warning
+ syswrite F, pack($format, @$_{@fields}) or return 0;
+ }
+ syswrite F, $magic or return 0;
+ 1;
+}
+sub zero_MBR($) { &write($_[0], 0, [ {} x $nb_primary ]); }
generated by cgit v1.2.1 (git 2.21.0) at 2024-05-31 18:44:55 +0000