blob: 7cf507c6d048a0dadd51ede882efecf36d4647ed (
plain) (
tree)
|
|
/*[
bt.c
LOCAL CHAR SccsID[]="@(#)bt.c 1.5 02/09/94";
BT CPU functions.
-----------------
]*/
#include <insignia.h>
#include <host_def.h>
#include <xt.h>
#include <c_main.h>
#include <c_addr.h>
#include <c_bsic.h>
#include <c_prot.h>
#include <c_seg.h>
#include <c_stack.h>
#include <c_xcptn.h>
#include <c_reg.h>
#include <bt.h>
/*
=====================================================================
EXTERNAL FUNCTIONS START HERE.
=====================================================================
*/
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
/* Generic - one size fits all 'bt'. */
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
GLOBAL VOID
BT
IFN3(
IU32, op1, /* lsrc operand */
IU32, op2, /* rsrc (ie bit nr.) operand */
IUM8, op_sz /* 16 or 32-bit */
)
{
IU32 bit_mask;
op2 = op2 % op_sz; /* take bit nr. modulo operand size */
bit_mask = 1 << op2; /* form mask for bit */
SET_CF((op1 & bit_mask) != 0); /* set CF to given bit */
}
|
