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-rw-r--r--gpxe/src/arch/i386/interface/pxe/pxe_call.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/gpxe/src/arch/i386/interface/pxe/pxe_call.c b/gpxe/src/arch/i386/interface/pxe/pxe_call.c
index 04aaf3b2..06dee25c 100644
--- a/gpxe/src/arch/i386/interface/pxe/pxe_call.c
+++ b/gpxe/src/arch/i386/interface/pxe/pxe_call.c
@@ -433,22 +433,24 @@ void pxe_init_structures ( void ) {
* @ret rc Return status code
*/
int pxe_start_nbp ( void ) {
- int discard_b, discard_c;
+ int discard_b, discard_c, discard_d, discard_D;
uint16_t rc;
/* Far call to PXE NBP */
- __asm__ __volatile__ ( REAL_CODE ( "pushw %%cx\n\t"
- "pushw %%ax\n\t"
- "movw %%cx, %%es\n\t"
+ __asm__ __volatile__ ( REAL_CODE ( "movw %%cx, %%es\n\t"
+ "pushw %%es\n\t"
+ "pushw %%di\n\t"
"sti\n\t"
"lcall $0, $0x7c00\n\t"
"addw $4, %%sp\n\t" )
: "=a" ( rc ), "=b" ( discard_b ),
- "=c" ( discard_c )
- : "a" ( __from_text16 ( &ppxe ) ),
- "b" ( __from_text16 ( &pxenv ) ),
- "c" ( rm_cs )
- : "edx", "esi", "edi", "ebp", "memory" );
+ "=c" ( discard_c ), "=d" ( discard_d ),
+ "=D" ( discard_D )
+ : "a" ( 0 ), "b" ( __from_text16 ( &pxenv ) ),
+ "c" ( rm_cs ),
+ "d" ( virt_to_phys ( &pxenv ) ),
+ "D" ( __from_text16 ( &ppxe ) )
+ : "esi", "ebp", "memory" );
return rc;
}