blob: daa69489b5b62d4dd87c465f1c50fd5c36ad2a18 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*[
btc.c
LOCAL CHAR SccsID[]="@(#)btc.c 1.5 02/09/94";
BTC 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 <btc.h>
/*
=====================================================================
EXTERNAL FUNCTIONS START HERE.
=====================================================================
*/
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
/* Generic - one size fits all 'btc'. */
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
GLOBAL VOID
BTC
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 = !Bit */
}
|
