merge

[plan9front.git] / sys / src / boot / pc / x16.h

diff --git a/sys/src/boot/pc/x16.h b/sys/src/boot/pc/x16.h
index f0c9376dc97f6b90dd6c6a9de095024df5ca05af..21edbac46c8a245a3c6b365dc2d03db52c4ae94b 100644 (file)
--- a/sys/src/boot/pc/x16.h
+++ b/sys/src/boot/pc/x16.h
@@ -117,6 +117,7 @@
                        BYTE $i;
 #define SHRBI(i, r)    OPrr(0xC0, 0x05, r);    /* r>>i -> r */         \
                        BYTE $i;
+#define SBB(r0, r1)    OPrr(0x19, r0, r1)      /* r1-r0 -> r1 */
 #define SUB(r0, r1)    OPrr(0x29, r0, r1)      /* r1-r0 -> r1 */
 #define SUBI(i, r)     OP(0x81, 0x03, 0x05, r);/* r-i -> r */          \
                        WORD $i;