NetBSD-5.0.2/sys/arch/acorn32/podulebus/rapide_io_asm.S

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/*	$NetBSD: rapide_io_asm.S,v 1.1 2001/10/05 22:27:58 reinoud Exp $	*/

/*
 * Copyright (c) 1997 Mark Brinicombe.
 * Copyright (c) 1997 Causality Limited.
 * 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 by Mark Brinicombe
 *	for the NetBSD Project.
 * 4. The name of the company nor the name of the author may 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 OR CONTRIBUTORS 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.
 */

#include <machine/asm.h>

/*
 * bus_space I/O functions for Yellowstone RapIDE podule
 *
 * These are optimised 32 bit transfer routines
 */

ENTRY(rapide_bs_rm_4)
	add	r0, r1, r2
	mov	r1, r3

	/* Test length */
	ldr	r2, [sp, #0]
	tst	r2, #0x7f
	beq	rapide_rm_4_m128
	tst	r2, #0x07
	beq	rapide_rm_4_m8

	/* xfer 4 bytes at a time */
rapide_rm_4_loop:
	ldr	r3, [r0]
	str	r3, [r1], #0x0004
	subs	r2, r2, #1
	bne	rapide_rm_4_loop

	mov	pc, lr

rapide_rm_4_m8:
	/* xfer 32 bytes at a time */
	stmfd	sp!, {r4-r10}

rapide_rm_4_m8_loop:
	ldmia	r0, {r3-r10}
	stmia	r1!, {r3-r10}
	subs	r2, r2, #8
	bne	rapide_rm_4_m8_loop

	ldmfd	sp!, {r4-r10}
	mov	pc, lr

rapide_rm_4_m128:
	/* xfer 512 bytes at a time */
	stmfd	sp!, {r4-r12, r14}

rapide_rm_4_m128_loop:
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r12, r14}
	stmia	r1!, {r3-r12, r14}
	ldmia	r0, {r3-r9}
	stmia	r1!, {r3-r9}
	subs	r2, r2, #128
	bne	rapide_rm_4_m128_loop

	ldmfd	sp!, {r4-r12, pc}

ENTRY(rapide_bs_wm_4)
	add	r0, r1, r2
	mov	r1, r3
	ldr	r2, [sp, #0]
	tst	r2, #0x7f
	beq	rapide_wm_4_m128
	tst	r2, #0x07
	beq	rapide_wm_4_m8

	/* xfer 4 bytes at a time */
rapide_wm_4_loop:
	ldr	r3, [r1], #0x0004
	str	r3, [r0]
	subs	r2, r2, #1
	bne	rapide_wm_4_loop

	mov	pc, lr

rapide_wm_4_m8:
	/* xfer 32 bytes at a time */
	stmfd	sp!, {r4-r10}

rapide_wm_4_m8_loop:
	ldmia	r1!, {r3-r10}
	stmia	r0, {r3-r10}
	subs	r2, r2, #8
	bne	rapide_wm_4_m8_loop

	ldmfd	sp!, {r4-r10}
	mov	pc, lr

rapide_wm_4_m128:
	/* xfer 512 bytes at a time */
	stmfd	sp!, {r4-r12}

rapide_wm_4_m128_loop:
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r12}
	stmia	r0, {r3-r12}
	ldmia	r1!, {r3-r10}
	stmia	r0, {r3-r10}
	subs	r2, r2, #128
	bne	rapide_wm_4_m128_loop

	ldmfd	sp!, {r4-r12}
	mov	pc, lr