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55 lines
1.2 KiB
55 lines
1.2 KiB
/*[
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btc.c
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LOCAL CHAR SccsID[]="@(#)btc.c 1.5 02/09/94";
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BTC CPU functions.
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------------------
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]*/
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#include <insignia.h>
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#include <host_def.h>
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#include <xt.h>
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#include <c_main.h>
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#include <c_addr.h>
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#include <c_bsic.h>
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#include <c_prot.h>
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#include <c_seg.h>
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#include <c_stack.h>
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#include <c_xcptn.h>
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#include <c_reg.h>
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#include <btc.h>
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/*
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=====================================================================
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EXTERNAL FUNCTIONS START HERE.
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=====================================================================
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*/
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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/* Generic - one size fits all 'btc'. */
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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GLOBAL VOID
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BTC
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IFN3(
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IU32 *, pop1, /* pntr to lsrc/dst operand */
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IU32, op2, /* rsrc (ie bit nr.) operand */
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IUM8, op_sz /* 16 or 32-bit */
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)
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{
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IU32 bit_mask;
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op2 = op2 % op_sz; /* take bit nr. modulo operand size */
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bit_mask = 1 << op2; /* form mask for bit */
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SET_CF((*pop1 & bit_mask) != 0); /* set CF to given bit */
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*pop1 = *pop1 ^ bit_mask; /* Set Bit = !Bit */
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}
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