The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $NetBSD: setcpsr.S,v 1.2 2002/08/15 01:37:02 briggs Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 1994 Mark Brinicombe.
    5  * Copyright (c) 1994 Brini.
    6  * All rights reserved.
    7  *
    8  * This code is derived from software written for Brini by Mark Brinicombe
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by Brini.
   21  * 4. The name of the company nor the name of the author may be used to
   22  *    endorse or promote products derived from this software without specific
   23  *    prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
   26  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   27  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   28  * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   29  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   30  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  * RiscBSD kernel project
   38  *
   39  * setcpsr.S
   40  *
   41  * Miscellaneous routines to play with the CPSR register
   42  *
   43  * Eventually this routine can be inline assembly.
   44  *
   45  * Created      : 12/09/94
   46  *
   47  * Based of kate/display/setcpsr.s
   48  *
   49  */
   50 
   51 #include <machine/asm.h>
   52 __FBSDID("$FreeBSD$");
   53 
   54 /* Sets and clears bits in the CPSR register
   55  *
   56  *  r0 - bic mask
   57  *  r1 - eor mask
   58  */
   59 
   60 ENTRY_NP(SetCPSR)
   61         mrs     r3, cpsr                /* Set the CPSR */
   62         bic     r2, r3, r0
   63         eor     r2, r2, r1
   64         msr     cpsr_all, r2
   65 
   66         mov     r0, r3                  /* Return the old CPSR */
   67 
   68         RET
   69 
   70 
   71 /* Gets the CPSR register
   72  *
   73  * Returns the CPSR in r0
   74  */
   75 
   76 ENTRY_NP(GetCPSR)
   77         mrs     r0, cpsr                /* Get the CPSR */
   78 
   79         RET
   80 

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