cpufunc_asm.S

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    1 /*      $NetBSD: cpufunc_asm.S,v 1.12 2003/09/06 09:14:52 rearnsha Exp $        */
    2 
    3 /*-
    4  * Copyright (c) 1997,1998 Mark Brinicombe.
    5  * Copyright (c) 1997 Causality Limited
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Causality Limited.
   19  * 4. The name of Causality Limited may not be used to endorse or promote
   20  *    products derived from this software without specific prior written
   21  *    permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY CAUSALITY LIMITED ``AS IS'' AND ANY EXPRESS
   24  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   25  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   26  * DISCLAIMED. IN NO EVENT SHALL CAUSALITY LIMITED BE LIABLE FOR ANY DIRECT,
   27  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   28  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   29  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  * RiscBSD kernel project
   36  *
   37  * cpufunc.S
   38  *
   39  * Assembly functions for CPU / MMU / TLB specific operations
   40  *
   41  * Created      : 30/01/97
   42  *
   43  */
   44 
   45 #include <machine/asm.h>
   46 __FBSDID("$FreeBSD$");
   47 
   48         .text
   49         .align  2
   50 
   51 ENTRY(cpufunc_nullop)
   52         RET
   53 END(cpufunc_nullop)
   54 
   55 /*
   56  * Generic functions to read/modify/write the internal coprocessor registers
   57  *
   58  *
   59  * Currently these registers are
   60  *  c1 - CPU Control
   61  *
   62  * All other registers are CPU architecture specific
   63  */
   64 
   65 ENTRY(cpufunc_control)
   66         mrc     CP15_SCTLR(r3)          /* Read the control register */
   67         bic     r2, r3, r0              /* Clear bits */
   68         eor     r2, r2, r1              /* XOR bits */
   69 
   70 
   71         teq     r2, r3                  /* Only write if there is a change */
   72         mcrne   CP15_SCTLR(r2)          /* Write new control register */
   73         mov     r0, r3                  /* Return old value */
   74 
   75         RET
   76 END(cpufunc_control)
   77

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

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