target/ppc/cpu.c

   1 /*
   2  *  PowerPC CPU routines for qemu.
   3  *
   4  * Copyright (c) 2017 Nikunj A Dadhania, IBM Corporation.
   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 2.1 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
  20 #include "qemu/osdep.h"
  21 #include "cpu.h"
  22 #include "cpu-models.h"
  23
  24 target_ulong cpu_read_xer(CPUPPCState *env)
  25 {
  26     if (is_isa300(env)) {
  27         return env->xer | (env->so << XER_SO) |
  28             (env->ov << XER_OV) | (env->ca << XER_CA) |
  29             (env->ov32 << XER_OV32) | (env->ca32 << XER_CA32);
  30     }
  31
  32     return env->xer | (env->so << XER_SO) | (env->ov << XER_OV) |
  33         (env->ca << XER_CA);
  34 }
  35
  36 void cpu_write_xer(CPUPPCState *env, target_ulong xer)
  37 {
  38     env->so = (xer >> XER_SO) & 1;
  39     env->ov = (xer >> XER_OV) & 1;
  40     env->ca = (xer >> XER_CA) & 1;
  41     /* write all the flags, while reading back check of isa300 */
  42     env->ov32 = (xer >> XER_OV32) & 1;
  43     env->ca32 = (xer >> XER_CA32) & 1;
  44     env->xer = xer & ~((1ul << XER_SO) |
  45                        (1ul << XER_OV) | (1ul << XER_CA) |
  46                        (1ul << XER_OV32) | (1ul << XER_CA32));
  47 }