1/* $NetBSD: fiq_subr.S,v 1.3 2002/04/12 18:50:31 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 * 37 */ 38 39 40#include <machine/asm.h> 41#include <machine/armreg.h> 42 43/* 44 * MODE_CHANGE_NOP should be inserted between a mode change and a 45 * banked register (R8--R15) access. 46 */ 47#if defined(CPU_ARM2) || defined(CPU_ARM250) 48#define MODE_CHANGE_NOP mov r0, r0 49#else 50#define MODE_CHANGE_NOP /* Data sheet says ARM3 doesn't need it */ 51#endif 52 53#define SWITCH_TO_FIQ_MODE \ 54 mrs r2, cpsr ; \ 55 mov r3, r2 ; \ 56 bic r2, r2, #(PSR_MODE) ; \ 57 orr r2, r2, #(PSR_FIQ32_MODE) ; \ 58 msr cpsr_fsxc, r2 59 60#define BACK_TO_SVC_MODE \ 61 msr cpsr_fsxc, r3 62 63/* 64 * fiq_getregs: 65 * 66 * Fetch the FIQ mode banked registers into the fiqhandler 67 * structure. 68 */ 69ENTRY(fiq_getregs) 70 SWITCH_TO_FIQ_MODE 71 72 stmia r0, {r8-r13} 73 74 BACK_TO_SVC_MODE 75 RET 76END(fiq_getregs) 77 78/* 79 * fiq_setregs: 80 * 81 * Load the FIQ mode banked registers from the fiqhandler 82 * structure. 83 */ 84ENTRY(fiq_setregs) 85 SWITCH_TO_FIQ_MODE 86 87 ldmia r0, {r8-r13} 88 89 BACK_TO_SVC_MODE 90 RET 91END(fiq_setregs) 92 93