target-openrisc/interrupt_helper.c

   1 /*
   2  * OpenRISC interrupt helper routines
   3  *
   4  * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
   5  *                         Feng Gao <gf91597@gmail.com>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "cpu.h"
  22 #include "helper.h"
  23
  24 void HELPER(rfe)(CPUOpenRISCState *env)
  25 {
  26     OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
  27 #ifndef CONFIG_USER_ONLY
  28     int need_flush_tlb = (cpu->env.sr & (SR_SM | SR_IME | SR_DME)) ^
  29                          (cpu->env.esr & (SR_SM | SR_IME | SR_DME));
  30 #endif
  31     cpu->env.pc = cpu->env.epcr;
  32     cpu->env.npc = cpu->env.epcr;
  33     cpu->env.sr = cpu->env.esr;
  34
  35 #ifndef CONFIG_USER_ONLY
  36     if (cpu->env.sr & SR_DME) {
  37         cpu->env.tlb->cpu_openrisc_map_address_data =
  38             &cpu_openrisc_get_phys_data;
  39     } else {
  40         cpu->env.tlb->cpu_openrisc_map_address_data =
  41             &cpu_openrisc_get_phys_nommu;
  42     }
  43
  44     if (cpu->env.sr & SR_IME) {
  45         cpu->env.tlb->cpu_openrisc_map_address_code =
  46             &cpu_openrisc_get_phys_code;
  47     } else {
  48         cpu->env.tlb->cpu_openrisc_map_address_code =
  49             &cpu_openrisc_get_phys_nommu;
  50     }
  51
  52     if (need_flush_tlb) {
  53         tlb_flush(&cpu->env, 1);
  54     }
  55 #endif
  56     cpu->env.interrupt_request |= CPU_INTERRUPT_EXITTB;
  57 }