fiq_subr.S

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    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 __FBSDID("$FreeBSD$");
   42 
   43 #include <machine/armreg.h>
   44 
   45 /*
   46  * MODE_CHANGE_NOP should be inserted between a mode change and a
   47  * banked register (R8--R15) access.
   48  */
   49 #if defined(CPU_ARM2) || defined(CPU_ARM250)
   50 #define MODE_CHANGE_NOP mov     r0, r0
   51 #else
   52 #define MODE_CHANGE_NOP /* Data sheet says ARM3 doesn't need it */
   53 #endif
   54 
   55 #define SWITCH_TO_FIQ_MODE                                              \
   56         mrs     r2, cpsr                                        ;       \
   57         mov     r3, r2                                          ;       \
   58         bic     r2, r2, #(PSR_MODE)                             ;       \
   59         orr     r2, r2, #(PSR_FIQ32_MODE)                       ;       \
   60         msr     cpsr_fsxc, r2
   61 
   62 #define BACK_TO_SVC_MODE                                                \
   63         msr     cpsr_fsxc, r3
   64 
   65 /*
   66  * fiq_getregs:
   67  *
   68  *      Fetch the FIQ mode banked registers into the fiqhandler
   69  *      structure.
   70  */
   71 ENTRY(fiq_getregs)
   72         SWITCH_TO_FIQ_MODE
   73 
   74         stmia   r0, {r8-r13}
   75 
   76         BACK_TO_SVC_MODE
   77         RET
   78 END(fiq_getregs)
   79 
   80 /*
   81  * fiq_setregs:
   82  *
   83  *      Load the FIQ mode banked registers from the fiqhandler
   84  *      structure.
   85  */
   86 ENTRY(fiq_setregs)
   87         SWITCH_TO_FIQ_MODE
   88 
   89         ldmia   r0, {r8-r13}
   90 
   91         BACK_TO_SVC_MODE
   92         RET
   93 END(fiq_setregs)
   94

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FreeBSD/Linux Kernel Cross Reference sys/arm/arm/fiq_subr.S

FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/fiq_subr.S