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#include "assym.h" 39 40#include <arm/armreg.h> 41#include <arm/asm.h> 42#include <arm/cpuconf.h> 43 44/* 45 * MODE_CHANGE_NOP should be inserted between a mode change and a 46 * banked register (R8--R15) access. 47 */ 48#if defined(CPU_ARM2) || defined(CPU_ARM250) 49#define MODE_CHANGE_NOP mov r0, r0 50#else 51#define MODE_CHANGE_NOP /* Data sheet says ARM3 doesn't need it */ 52#endif 53 54#ifdef __PROG32 55#define SWITCH_TO_FIQ_MODE \ 56 mrs r2, cpsr_all ; \ 57 mov r3, r2 ; \ 58 bic r2, r2, #(PSR_MODE) ; \ 59 orr r2, r2, #(PSR_FIQ32_MODE) ; \ 60 msr cpsr_all, r2 61#else 62#define SWITCH_TO_FIQ_MODE ; \ 63 mov r1, r15 ; \ 64 bic r2, r1, #(R15_MODE) ; \ 65 teqp r2, #(R15_MODE_FIQ) ; \ 66 MODE_CHANGE_NOP 67#endif /* __PROG32 */ 68 69#ifdef __PROG32 70#define BACK_TO_SVC_MODE \ 71 msr cpsr_all, r3 72#else 73#define BACK_TO_SVC_MODE ; \ 74 teqp r1, #0 ; \ 75 MODE_CHANGE_NOP 76#endif /* __PROG32 */ 77 78/* 79 * fiq_getregs: 80 * 81 * Fetch the FIQ mode banked registers into the fiqhandler 82 * structure. 83 */ 84ENTRY(fiq_getregs) 85 SWITCH_TO_FIQ_MODE 86 87 stmia r0, {r8-r13} 88 89 BACK_TO_SVC_MODE 90 mov pc, lr 91 92/* 93 * fiq_setregs: 94 * 95 * Load the FIQ mode banked registers from the fiqhandler 96 * structure. 97 */ 98ENTRY(fiq_setregs) 99 SWITCH_TO_FIQ_MODE 100 101 ldmia r0, {r8-r13} 102 103 BACK_TO_SVC_MODE 104 mov pc, lr 105 106/* 107 * fiq_nullhandler: 108 * 109 * Null handler copied down to the FIQ vector when the last 110 * FIQ handler is removed. 111 */ 112 .global _C_LABEL(fiq_nullhandler), _C_LABEL(fiq_nullhandler_end) 113_C_LABEL(fiq_nullhandler): 114 subs pc, lr, #4 115_C_LABEL(fiq_nullhandler_end): 116