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update multiboot.texi.

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okuji 1999-11-05 13:22:07 +00:00
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6
ChangeLog
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@ -1,3 +1,9 @@
1999-11-05 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>
* docs/multiboot.texi (Boot information format): Add the members
`drives_addr' and `drives_count' into the Multiboot information
structure, and added the descriptions.
1999-11-03 Gordon Matzigkeit <gord@fig.org>
* util/mbchk.c (main): Move the version number inside the

57
docs/multiboot.texi
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@ -540,6 +540,9 @@ follows:
44 | mmap_length | (present if flags[6] is set)
48 | mmap_addr | (present if flags[6] is set)
+-------------------+
52 | drives_count | (present if flags[7] is set)
56 | drives_addr | (present if flags[7] is set)
+-------------------+
@end group
@end example
@ -725,6 +728,60 @@ indicated a reserved area.
The map provided is guaranteed to list all standard @sc{ram} that should
be available for normal use.
If bit 7 in the @samp{flags} is set, then the @samp{drives_*} fields
are valid, and indicate the address of the physical address of the first
drive structure and the number of drive structures. @samp{drives_addr}
is the address, and @samp{drives_count} is the
number. @samp{drives_count} may be zero. Each drive structure is
formatted as follows:
@example
@group
+-------------------+
0 | drive_number |
+-------------------+
1 | drive_mode |
+-------------------+
2 | drive_cylinders |
4 | drive_heads |
5 | drive_sectors |
+-------------------+
6 | drive_ports |
+-------------------+
10 | reserved (0) |
+-------------------+
@end group
@end example
The @samp{drive_number} field contains the BIOS drive number. The
@samp{drive_mode} field represents the access mode used by the boot
loader. Currently, the following modes are defined:
@table @samp
@item 0
CHS mode (traditional cylinder/head/sector addressing mode).
@item 1
LBA mode (Logical Block Addressing mode).
@end table
The three fields, @samp{drive_cylinders}, @samp{drive_heads} and
@samp{drive_sectors}, indicate the geometry of the drive detected by the
@sc{bios}. @samp{drive_cylinders} contains the number of the
cylinders. @samp{drive_heads} contains the number of the
heads. @samp{drive_sectors} contains the number of the sectors per
track.
The @samp{drive_ports} field contains the physical address of the array
of the I/O ports used for the drive in the @sc{bios} code. The array
consists of zero or more unsigned two-bytes integers, and is terminated
with zero. Note that the array may contain any number of I/O ports that
are not related to the drive actually (such as @sc{dma} controller's
ports).
The last field @samp{reserved} is reserved for future use, and must be
zero. The size is four bytes.
@node Examples
@chapter Examples