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[util] Allow for CALL NEAR in the option ROM initialisation entry point 

Option::ROM currently understands only JMP NEAR and JMP SHORT
instructions in the initialisation entry point.  At least one Broadcom
option ROM has been observed to use a CALL NEAR instruction.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Daniel Wyatt 2012-08-15 12:50:01 +01:00 committed by Michael Brown
parent d0bd383463
commit 37ac7a666f
1 changed files with 4 additions and 0 deletions
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4
src/util/Option/ROM.pm
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@ -180,6 +180,7 @@ our %EXPORT_TAGS = ( all => [ @EXPORT_OK ] );
use constant JMP_SHORT => 0xeb;
use constant JMP_NEAR => 0xe9;
use constant CALL_NEAR => 0xe8;
sub pack_init {
my $dest = shift;
@ -203,6 +204,9 @@ sub unpack_init {
} elsif ( $jump == JMP_NEAR ) {
my $offset = unpack ( "xS", $instr );
return ( $offset + 6 );
} elsif ( $jump == CALL_NEAR ) {
my $offset = unpack ( "xS", $instr );
return ( $offset + 6 );
} elsif ( $jump == 0 ) {
return 0;
} else {