Archipelago » qemu

/*

 * OpenRISC interrupt helper routines

 *

 * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>

 *                         Feng Gao <gf91597@gmail.com>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "cpu.h"

#include "helper.h"

void HELPER(rfe)(CPUOpenRISCState *env)

{

    OpenRISCCPU *cpu = openrisc_env_get_cpu(env);

    CPUState *cs = CPU(cpu);

#ifndef CONFIG_USER_ONLY

    int need_flush_tlb = (cpu->env.sr & (SR_SM | SR_IME | SR_DME)) ^

                         (cpu->env.esr & (SR_SM | SR_IME | SR_DME));

#endif

    cpu->env.pc = cpu->env.epcr;

    cpu->env.npc = cpu->env.epcr;

    cpu->env.sr = cpu->env.esr;

#ifndef CONFIG_USER_ONLY

    if (cpu->env.sr & SR_DME) {

        cpu->env.tlb->cpu_openrisc_map_address_data =

            &cpu_openrisc_get_phys_data;

    } else {

        cpu->env.tlb->cpu_openrisc_map_address_data =

            &cpu_openrisc_get_phys_nommu;

    }

    if (cpu->env.sr & SR_IME) {

        cpu->env.tlb->cpu_openrisc_map_address_code =

            &cpu_openrisc_get_phys_code;

    } else {

        cpu->env.tlb->cpu_openrisc_map_address_code =

            &cpu_openrisc_get_phys_nommu;

    }

    if (need_flush_tlb) {

        tlb_flush(&cpu->env, 1);

    }

#endif

    cs->interrupt_request |= CPU_INTERRUPT_EXITTB;

}