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Updated to REAL_CODE()

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This commit is contained in:
Michael Brown 2006-05-24 13:28:39 +00:00
parent c4d688c005
commit e8550035af
1 changed files with 11 additions and 14 deletions
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25
src/arch/i386/firmware/pcbios/gateA20.c
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@ -50,26 +50,23 @@ static void empty_8042 ( void )
*/
void gateA20_set ( void ) {
static char reentry_guard = 0;
uint16_t flags, status;
unsigned int discard_a;
unsigned int flags;
if ( reentry_guard )
return;
reentry_guard = 1;
REAL_EXEC ( rm_enableA20,
"sti\n\t"
"stc\n\t"
"int $0x15\n\t"
"pushfw\n\t"
"popw %%bx\n\t"
"cli\n\t",
2,
OUT_CONSTRAINTS ( "=a" ( status ), "=b" ( flags ) ),
IN_CONSTRAINTS ( "a" ( Enable_A20 ) ),
CLOBBER ( "ecx", "edx", "ebp", "esi", "edi" ) );
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"stc\n\t"
"int $0x15\n\t"
"pushfw\n\t"
"popw %w0\n\t"
"cli\n\t" )
: "=r" ( flags ), "=a" ( discard_a )
: "a" ( Enable_A20 ) );
if ( ( flags & CF ) ||
( ( status >> 8 ) & 0xff ) ) {
if ( flags & CF ) {
/* INT 15 method failed, try alternatives */
#ifdef IBM_L40
outb(0x2, 0x92);