Date: Tue, 12 Oct 1999 14:33:49 -0700 (PDT) From: John Baldwin <jhb@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/boot/i386/btx/btx Makefile btx.s Message-ID: <199910122133.OAA22783@freefall.freebsd.org>
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jhb 1999/10/12 14:33:49 PDT
Modified files:
sys/boot/i386/btx/btx Makefile btx.s
Log:
aThis patch updates the BTX to emulate the BIOS function "Copy Extended
Memory" called as function 0x87 of interrupt 0x15. Since the Mylex RAID
adapter's BIOS used this function to access memory (actually PCI bus
space) beyond 16 MB, this patch also allows BTX to address all 4 Gig of
possible address space on i386+. Since the loader does not have room for
4 MB of page tables, this was done by turning off paging.
Paging was turned off via a compile time setting which defaults to off.
To enable paging, simply define the make variable PAGING.
rnordier might want to clean this up later.
Submitted by: W. Gerald Hicks <wghicks@bellsouth.net>,
Bosko Milekic <bmilekic@ares.dsuper.net>
Reviewed by: msmith
Required by: Mylex RAID adapter's BIOS
Revision Changes Path
1.7 +7 -2 src/sys/boot/i386/btx/btx/Makefile
1.12 +67 -5 src/sys/boot/i386/btx/btx/btx.s
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