bitops.h File Reference

Internal Interface: H8/300 bit operations. More...

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Macros
#define	ASMCONST   const
#define	bit_set(byte, bit)   __asm__ ASMCONST ( "bset %0,@%1\n" : : "i" (bit),"r" (byte))
	set a single bit in memory More...
#define	bit_clear(byte, bit)   __asm__ ASMCONST ( "bclr %0,@%1\n" : : "i" (bit),"r" (byte))
	clear a single bit in memory More...
#define	bit_load(mask, bit)   __asm__ ASMCONST ( "bld %0,%1l\n" : : "i" (bit),"r" (mask):"cc")
	load a single bit from a mask to the carry flag More...
#define	bit_iload(mask, bit)   __asm__ ASMCONST ( "bild %0,%1l\n" : : "i" (bit),"r" (mask):"cc")
	load the inverse of a single bit from a mask to the carry flag More...
#define	bit_store(byte, bit)   __asm__ ASMCONST ( "bst %0,@%1\n" : : "i" (bit),"r" (byte))
	store the carry flag to a single single bit in memory More...

Detailed Description

Internal Interface: H8/300 bit operations.

Author

Markus L. Noga marku.nosp@m.s@no.nosp@m.ga.de

Definition in file bitops.h.

Macro Definition Documentation

ASMCONST

#define ASMCONST   const

Definition at line 45 of file bitops.h.

bit_clear

#define bit_clear	(		byte,
			bit
	)		__asm__ ASMCONST ( "bclr %0,@%1\n" : : "i" (bit),"r" (byte))

clear a single bit in memory

((char*)byte)&=~(1<<bit)

Definition at line 65 of file bitops.h.

bit_iload

#define bit_iload	(		mask,
			bit
	)		__asm__ ASMCONST ( "bild %0,%1l\n" : : "i" (bit),"r" (mask):"cc")

load the inverse of a single bit from a mask to the carry flag

carry=mask & inverse of (1<<bit)

Definition at line 77 of file bitops.h.

bit_load

#define bit_load	(		mask,
			bit
	)		__asm__ ASMCONST ( "bld %0,%1l\n" : : "i" (bit),"r" (mask):"cc")

load a single bit from a mask to the carry flag

carry=mask & (1<<bit)

Definition at line 71 of file bitops.h.

bit_set

#define bit_set	(		byte,
			bit
	)		__asm__ ASMCONST ( "bset %0,@%1\n" : : "i" (bit),"r" (byte))

set a single bit in memory

*((char*)byte)|=(1<<bit)

Definition at line 59 of file bitops.h.

bit_store

#define bit_store	(		byte,
			bit
	)		__asm__ ASMCONST ( "bst %0,@%1\n" : : "i" (bit),"r" (byte))

store the carry flag to a single single bit in memory

*((char*)byte)= ( (*((char*)byte)) & (~(1<<bit)) ) | (carry<<bit)

Definition at line 83 of file bitops.h.