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/*[
btr.c
LOCAL CHAR SccsID[]="@(#)btr.c 1.5 02/09/94";
BTR 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 <btr.h>
/*
=====================================================================
EXTERNAL FUNCTIONS START HERE.
=====================================================================
*/
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
/* Generic - one size fits all 'btr'. */
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
GLOBAL VOID
BTR
IFN3(
IU32 *, pop1, /* pntr to lsrc/dst 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((*pop1 & bit_mask) != 0); /* set CF to given bit */
*pop1 = *pop1 & ~bit_mask; /* Set Bit = 0 */
}
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