Archipelago » qemu

/*

 *  Helpers for system instructions.

 *

 *  Copyright (c) 2007 Jocelyn Mayer

 *

 * 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"

#include "sysemu.h"

#include "qemu-timer.h"

uint64_t helper_load_pcc(CPUAlphaState *env)

{

#ifndef CONFIG_USER_ONLY

    /* In system mode we have access to a decent high-resolution clock.

       In order to make OS-level time accounting work with the RPCC,

       present it with a well-timed clock fixed at 250MHz.  */

    return (((uint64_t)env->pcc_ofs << 32)

            | (uint32_t)(qemu_get_clock_ns(vm_clock) >> 2));

#else

    /* In user-mode, vm_clock doesn't exist.  Just pass through the host cpu

       clock ticks.  Also, don't bother taking PCC_OFS into account.  */

    return (uint32_t)cpu_get_real_ticks();

#endif

}

/* PALcode support special instructions */

#ifndef CONFIG_USER_ONLY

void helper_hw_ret(CPUAlphaState *env, uint64_t a)

{

    env->pc = a & ~3;

    env->intr_flag = 0;

    env->lock_addr = -1;

    if ((a & 1) == 0) {

        env->pal_mode = 0;

        swap_shadow_regs(env);

    }

}

void helper_tbia(CPUAlphaState *env)

{

    tlb_flush(env, 1);

}

void helper_tbis(CPUAlphaState *env, uint64_t p)

{

    tlb_flush_page(env, p);

}

void helper_halt(uint64_t restart)

{

    if (restart) {

        qemu_system_reset_request();

    } else {

        qemu_system_shutdown_request();

    }

}

uint64_t helper_get_time(void)

{

    return qemu_get_clock_ns(rtc_clock);

}

void helper_set_alarm(CPUAlphaState *env, uint64_t expire)

{

    if (expire) {

        env->alarm_expire = expire;

        qemu_mod_timer(env->alarm_timer, expire);

    } else {

        qemu_del_timer(env->alarm_timer);

    }

}

#endif /* CONFIG_USER_ONLY */