Date: Thu, 14 Aug 1997 19:19:47 -0500 From: Jonathan Lemon <jlemon@americantv.com> To: Jonathan Mini <j_mini@efn.org>, emulation@freebsd.org Subject: Calling BIOS from within FreeBSD Message-ID: <19970814191947.62382@right.PCS> In-Reply-To: <19970812194056.12566@micron.efn.org>; from Jonathan Mini on Aug 08, 1997 at 07:40:56PM -0700 References: <19970811114903.20861@micron.efn.org> <199708112025.WAA03492@sos.freebsd.dk> <19970812195034.31150@right.PCS> <19970812194056.12566@micron.efn.org>
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Hello -
I have patches to -current for a "vm86 thread". Although in a very rough
state, it allows you to execute random BIOS functions. For example:
INT x10, AH=x10, AL=x19 (Read VGA Pel Mask register)
scratch[6:50pm](0)# ./vmcall 0x10 0x10 0x19
result: 0
trapno: 9 err: 0
ax=1019 bx=00ff cx=0000 dx=0000
si=0000 di=0000 sp=8000 bp=0000
cs=0000 ss=0000 ds=0000 es=0000
ip=7c02 eflags=b0202
INT x10, AH=x4F, AL=0 (Get SVGA general information)
scratch[6:50pm](0)# ./vmcall 0x10 0x4F 0
result: 0
trapno: 9 err: 0
ax=004f bx=0000 cx=0000 dx=0000
si=0000 di=0000 sp=8000 bp=0000
cs=0000 ss=0000 ds=0000 es=0000
ip=7c02 eflags=b0202
(Whups, I forgot I'm calling it with es:di == 0:0, so there goes my
interrupt table. Urk. But here's the result:)
int 0x00: 0x41534556 int 0x01: 0x500e0102
int 0x02: 0xc000 int 0x03: 0x502d0000
int 0x04: 0x20c000 int 0x05: 0x0
int 0x06: 0x0 int 0x07: 0x0
int 0x08: 0x0 int 0x09: 0x0
The patches are at: ftp://sumatra.americantv.com/pub/vm86-970814.tar.gz
--
Jonathan
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