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root/bsp/hal/ppc/arch/cpufunc.S

DEFINITIONS

1. get_decr
2. set_decr
3. cpu_idle

   1 /*-
   2  * Copyright (c) 2009, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 /*
  31  * cpufunc.S - Functions to provide access to PPC specific instructions.
  32  */
  34 #include <conf/config.h>
  35 #include <machine/asm.h>
  36 #include <cpu.h>
  38 /*
  39  * uint32 get_decr(void);
  40  */
ENTRY(get_decr)
  42         mfdec   r3
  43         blr
  45 /*
  46  * void set_decr(uint32_t);
  47  */
ENTRY(set_decr)
  49         mtdec   r3
  50         blr
  52 /*
  53  * void cpu_idle(void);
  54  */
ENTRY(cpu_idle)
  56         mfmsr   r3
  57         ori     r3, r3, MSR_EE@l        /* enable ints */
  58         mtmsr   r3
  59         isync
  60         sync
  62         mfmsr   %r3
  63         oris    r3, r3, MSR_POW@h       /* set low power mode */
  64         mtmsr   r3
  65         isync
  66         blr