Date: Tue, 27 Jun 2000 13:04:11 -0700 (PDT) From: John Baldwin <jhb@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/boot/i386/mbr mbr.s Message-ID: <200006272004.NAA56308@freefall.freebsd.org>
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jhb 2000/06/27 13:04:11 PDT
Modified files:
sys/boot/i386/mbr mbr.s
Log:
- Don't blindly assume that there are 8 hard drives installed. Instead,
use the BIOS Equipment List to determine how many hard drives are
installed and if the drive number we received in %dl is valid.
- Don't bother to disable interrupts when setting up the stack. The 8086
and beyond implicitly disable interrupts after an instruction that sets
%ss (for example, a pop or a mov) so that you can safely set %ss and %sp
in two consecutive instructions. An exception to this is the lss
instruction, which can set both registers simultaneously and thus doesn't
need this hack.
- Add support for EDD BIOS extensions to support booting off of hard drives
of nearly arbitrary length.
Revision Changes Path
1.6 +38 -11 src/sys/boot/i386/mbr/mbr.s
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