diff options
| -rw-r--r-- | src/arch/i386/prefix/libprefix.S | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/arch/i386/prefix/libprefix.S b/src/arch/i386/prefix/libprefix.S index 0be96798b..5a2dff57f 100644 --- a/src/arch/i386/prefix/libprefix.S +++ b/src/arch/i386/prefix/libprefix.S @@ -394,8 +394,10 @@ process_bytes: movw %ax, %fs movw %ax, %gs +#ifdef NDEBUG /* Call memcpy()-like function */ call *%bx +#endif /* Return to (flat) real mode */ movl %cr0, %eax @@ -409,6 +411,20 @@ process_bytes: popw %fs popw %gs +#ifndef NDEBUG + /* Call memcpy()-like function in flat real mode (to allow for + * debug output via INT 10). + */ + pushw %ds + pushw %es + xorw %ax, %ax + movw %ax, %ds + movw %ax, %es + call *%bx + popw %es + popw %ds +#endif + /* Restore GDT */ data32 lgdt -8(%bp) addw $( 8 /* saved GDT */ + ( PM_DS + 8 ) /* GDT on stack */ ), %sp |