vax/include/macros.h

/*	$NetBSD: macros.h,v 1.43 2007/11/20 13:37:37 yamt Exp $	*/

/*
 * Copyright (c) 1994, 1998, 2000 Ludd, University of Lule}, Sweden.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *     This product includes software developed at Ludd, University of Lule}.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

 /* All bugs are subject to removal without further notice */

#if !defined(_VAX_MACROS_H_) && !defined(__lint__)
#define _VAX_MACROS_H_

void	__blkset(void *, int, size_t);
void	__blkcpy(const void *, void *, size_t);

#if !__GNUC_PREREQ__(4, 1)
/* Here general macros are supposed to be stored */

static __inline int __attribute__((__unused__))
vax_ffs(int reg)
{
	register int val;

	__asm volatile ("ffs $0,$32,%1,%0;"
			    "bneq 1f;"
			    "mnegl $1,%0;"
			    "1:;"
			    "incl %0"
			: "=&r" (val)
			: "r" (reg) );
	return	val;
}
#define ffs vax_ffs
#endif

static __inline void __attribute__((__unused__))
vax_remque(void *p)
{
	__asm volatile ("remque (%0),%0;clrl 4(%0)"
			:
			: "r" (p)
			: "memory" );
}
#define _remque vax_remque

static __inline void  __attribute__((__unused__))
vax_insque(void *p, void *q)
{
	__asm volatile ("insque (%0),(%1)"
			:
			: "r" (p),"r" (q)
			: "memory" );
}
#define _insque vax_insque

#if 0
static __inline void *__attribute__((__unused__))
vax_memcpy(void *to, const void *from, size_t len)
{
	if (len > 65535) {
		__blkcpy(from, to, len);
	} else {
		__asm volatile ("movc3 %1,(%2),%0"
			: "=m" (*(char *)to)
			: "g" (len), "r" (*(const char *)from)
			:"r0","r1","r2","r3","r4","r5","memory","cc");
	}
	return to;
}
#define memcpy vax_memcpy

static __inline void *__attribute__((__unused__))
vax_memmove(void *to, const void *from, size_t len)
{
	if (len > 65535) {
		__blkcpy(from, to, len);
	} else {
		__asm __volatile ("movc3 %1,%2,%0"
			: "=m" (*(char *)to)
			: "g" (len), "mo" (*(const char *)from)
			:"r0","r1","r2","r3","r4","r5","memory","cc");
	}
	return to;
}
#define memmove vax_memmove
#endif

static __inline void *__attribute__((__unused__))
vax_memset(void *block, int c, size_t len)
{
	if (len > 65535) {
		__blkset(block, c, len);
	} else {
		__asm __volatile ("movc5 $0,(%%sp),%2,%1,%0"
			: "=m" (*(char *)block)
			:  "g" (len), "g" (c)
			:"r0","r1","r2","r3","r4","r5","memory","cc");
	}
	return block;
}
#define memset vax_memset

#ifdef notdef
/* XXX - the return syntax of memcmp is wrong */
static __inline int __attribute__((__unused__))
memcmp(const void *b1, const void *b2, size_t len)
{
	register int ret;

	__asm volatile("cmpc3 %3,(%1),(%2);"
			   "movl %%r0,%0"
			: "=r" (ret)
			: "r" (b1), "r" (b2), "r" (len)
			: "r0","r1","r2","r3" );
	return ret;
}

static __inline int __attribute__((__unused__))
bcmp(const void *b1, const void *b2, size_t len)
{
	register int ret;

	__asm volatile("cmpc3 %3,(%1),(%2);"
			   "movl %%r0,%0"
			: "=r" (ret)
			: "r" (b1), "r" (b2), "r" (len)
			: "r0","r1","r2","r3" );
	return ret;
}

/* Begin nya */
static __inline size_t __attribute__((__unused__))
strlen(const char *cp)
{
        register size_t ret;

        __asm volatile("locc $0,$65535,(%1);"
			   "subl3 %%r0,$65535,%0"
                        : "=r" (ret)
                        : "r" (cp)
                        : "r0","r1","cc" );
        return  ret;
}

static __inline char * __attribute__((__unused__))
strcat(char *cp, const char *c2)
{
        __asm volatile("locc $0,$65535,(%1);"
			   "subl3 %%r0,$65535,%%r2;"
			   "incl %%r2;"
                           "locc $0,$65535,(%0);"
			   "movc3 %%r2,(%1),(%%r1)"
                        :
                        : "r" (cp), "r" (c2)
                        : "r0","r1","r2","r3","r4","r5","memory","cc");
        return  cp;
}

static __inline char * __attribute__((__unused__))
strncat(char *cp, const char *c2, size_t count)
{
        __asm volatile("locc $0,%2,(%1);"
			   "subl3 %%r0,%2,%%r2;"
                           "locc $0,$65535,(%0);"
			   "movc3 %%r2,(%1),(%%r1);"
			   "movb $0,(%%r3)"
                        :
                        : "r" (cp), "r" (c2), "g"(count)
                        : "r0","r1","r2","r3","r4","r5","memory","cc");
        return  cp;
}

static __inline char * __attribute__((__unused__))
strcpy(char *cp, const char *c2)
{
        __asm volatile("locc $0,$65535,(%1);"
			   "subl3 %%r0,$65535,%%r2;"
                           "movc3 %%r2,(%1),(%0);"
			   "movb $0,(%%r3)"
                        :
                        : "r" (cp), "r" (c2)
                        : "r0","r1","r2","r3","r4","r5","memory","cc");
        return  cp;
}

static __inline char * __attribute__((__unused__))
strncpy(char *cp, const char *c2, size_t len)
{
        __asm volatile("movl %2,%%r2;"
			   "locc $0,%%r2,(%1);"
			   "beql 1f;"
			   "subl3 %%r0,%2,%%r2;"
                           "clrb (%0)[%%r2];"
			   "1:;"
			   "movc3 %%r2,(%1),(%0)"
                        :
                        : "r" (cp), "r" (c2), "g"(len)
                        : "r0","r1","r2","r3","r4","r5","memory","cc");
        return  cp;
}

static __inline void *__attribute__((__unused__))
memchr(const void *cp, int c, size_t len)
{
        void *ret;
        __asm volatile("locc %2,%3,(%1);"
			   "bneq 1f;"
			   "clrl %%r1;"
			   "1:;"
			   "movl %%r1,%0"
                        : "=g"(ret)
                        : "r" (cp), "r" (c), "g"(len)
                        : "r0","r1","cc");
        return  ret;
}

static __inline int __attribute__((__unused__))
strcmp(const char *cp, const char *c2)
{
        register int ret;
        __asm volatile("locc $0,$65535,(%1);"
			   "subl3 %%r0,$65535,%%r0;"
			   "incl %%r0;"
                           "cmpc3 %%r0,(%1),(%2);"
			   "beql 1f;"
			   "movl $1,%%r2;"
                           "cmpb (%%r1),(%%r3);"
			   "bcc 1f;"
			   "mnegl $1,%%r2;"
			   "1:;"
			   "movl %%r2,%0"
                        : "=g"(ret)
                        : "r" (cp), "r" (c2)
                        : "r0","r1","r2","r3","cc");
        return  ret;
}
#endif

#if 0 /* unused, but no point in deleting it since it _is_ an instruction */
static __inline int __attribute__((__unused__))
locc(int mask, char *cp, size_t size){
	register ret;

	__asm volatile("locc %1,%2,(%3);"
			   "movl %%r0,%0"
			: "=r" (ret)
			: "r" (mask),"r"(size),"r"(cp)
			: "r0","r1" );
	return	ret;
}
#endif

static __inline int __attribute__((__unused__))
vax_scanc(u_int size, const u_char *cp, const u_char *table, int mask)
{
	register int ret;

	__asm volatile("scanc %1,(%2),(%3),%4;"
			   "movl %%r0,%0"
			: "=g"(ret)
			: "r"(size),"r"(cp),"r"(table),"r"(mask)
			: "r0","r1","r2","r3" );
	return ret;
}
#define scanc vax_scanc

static __inline int __attribute__((__unused__))
vax_skpc(int mask, size_t size, u_char *cp)
{
	register int ret;

	__asm volatile("skpc %1,%2,(%3);"
			   "movl %%r0,%0"
			: "=g"(ret)
			: "r"(mask),"r"(size),"r"(cp)
			: "r0","r1" );
	return	ret;
}
#define skpc vax_skpc

/*
 * Set/clear a bit at a memory position; interlocked.
 * Return 0 if already set, 1 otherwise.
 */
static __inline int __attribute__((__unused__))
bbssi(int bitnr, long *addr)
{
	register int ret;

	__asm volatile("clrl %%r0;"
			   "bbssi %1,%2,1f;"
			   "incl %%r0;"
			   "1:;"
			   "movl %%r0,%0"
		: "=&r"(ret)
		: "g"(bitnr),"m"(*addr)
		: "r0","cc","memory");
	return ret;
}

static __inline int __attribute__((__unused__))
bbcci(int bitnr, long *addr)
{
	register int ret;

	__asm volatile("clrl %%r0;"
			   "bbcci %1,%2,1f;"
			   "incl %%r0;"
			   "1:;"
			   "movl %%r0,%0"
		: "=&r"(ret)
		: "g"(bitnr),"m"(*addr)
		: "r0","cc","memory");
	return ret;
}

static inline struct lwp *
cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp, bool returning)
{
	struct lwp *prevlwp;
	__asm volatile(
		"movl %1,%%r0;"
		"movl %2,%%r1;"
		"movpsl -(%%sp);"
		"jsb Swtchto;"
		"movl %%r0,%0"
	    : "=g"(prevlwp)
	    : "g" (oldlwp), "g" (newlwp)
	    : "r0", "r1");
	return prevlwp;
}

/*
 * Interlock instructions. Used both in multiprocessor environments to
 * lock between CPUs and in uniprocessor systems when locking is required
 * between I/O devices and the master CPU.
 */
/*
 * Insqti() locks and inserts an element into the end of a queue.
 * Returns -1 if interlock failed, 1 if inserted OK and 0 if first in queue.
 */
static __inline int __attribute__((__unused__))
insqti(void *entry, void *header) {
	register int ret;

	__asm volatile(
		"	mnegl $1,%0;"
		"	insqti (%1),(%2);"
		"	bcs 1f;"		/* failed insert */
		"	beql 2f;"		/* jump if first entry */
		"	movl $1,%0;"
		"	brb 1f;"
		"2:	clrl %0;"
		"	1:;"
			: "=&g"(ret)
			: "r"(entry), "r"(header)
			: "memory");

	return ret;
}

/*
 * Remqhi() removes an element from the head of the queue.
 * Returns -1 if interlock failed, 0 if queue empty, address of the
 * removed element otherwise.
 */
static __inline void *__attribute__((__unused__))
remqhi(void *header) {
	register void *ret;

	__asm volatile(
		"	remqhi (%1),%0;"
		"	bcs 1f;"		/* failed interlock */
		"	bvs 2f;"		/* nothing was removed */
		"	brb 3f;"
		"1:	mnegl $1,%0;"
		"	brb 3f;"
		"2:	clrl %0;"
		"	3:;"
			: "=&g"(ret)
			: "r"(header)
			: "memory");

	return ret;
}
#define	ILCK_FAILED	-1	/* Interlock failed */
#define	Q_EMPTY		0	/* Queue is/was empty */
#define	Q_OK		1	/* Inserted OK */

#endif	/* !_VAX_MACROS_H_ && !__lint__ */