target-ppc/mpic_helper.c

   1 /*
   2  *  PowerPC emulation helpers for QEMU.
   3  *
   4  *  Copyright (c) 2003-2007 Jocelyn Mayer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "cpu.h"
  20 #include "helper.h"
  21
  22 /*****************************************************************************/
  23 /* SPR accesses */
  24
  25 #if !defined(CONFIG_USER_ONLY)
  26 /*
  27  * This is an ugly helper for EPR, which is basically the same as accessing
  28  * the IACK (PIAC) register on the MPIC. Because we model the MPIC as a device
  29  * that can only talk to the CPU through MMIO, let's access it that way!
  30  */
  31 target_ulong helper_load_epr(CPUPPCState *env)
  32 {
  33     return ldl_phys(env->mpic_cpu_base + 0xA0);
  34 }
  35 #endif