LXR qemu/target-alpha/sys

   1/*
   2 *  Helpers for system instructions.
   3 *
   4 *  Copyright (c) 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
  20#include "qemu/osdep.h"
  21#include "cpu.h"
  22#include "exec/helper-proto.h"
  23#include "sysemu/sysemu.h"
  24#include "qemu/timer.h"
  25
  26
  27uint64_t helper_load_pcc(CPUAlphaState *env)
  28{
  29#ifndef CONFIG_USER_ONLY
  30    /* In system mode we have access to a decent high-resolution clock.
  31       In order to make OS-level time accounting work with the RPCC,
  32       present it with a well-timed clock fixed at 250MHz.  */
  33    return (((uint64_t)env->pcc_ofs << 32)
  34            | (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2));
  35#else
  36    /* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist.  Just pass through the host cpu
  37       clock ticks.  Also, don't bother taking PCC_OFS into account.  */
  38    return (uint32_t)cpu_get_host_ticks();
  39#endif
  40}
  41
  42/* PALcode support special instructions */
  43#ifndef CONFIG_USER_ONLY
  44void helper_tbia(CPUAlphaState *env)
  45{
  46    tlb_flush(CPU(alpha_env_get_cpu(env)), 1);
  47}
  48
  49void helper_tbis(CPUAlphaState *env, uint64_t p)
  50{
  51    tlb_flush_page(CPU(alpha_env_get_cpu(env)), p);
  52}
  53
  54void helper_tb_flush(CPUAlphaState *env)
  55{
  56    tb_flush(CPU(alpha_env_get_cpu(env)));
  57}
  58
  59void helper_halt(uint64_t restart)
  60{
  61    if (restart) {
  62        qemu_system_reset_request();
  63    } else {
  64        qemu_system_shutdown_request();
  65    }
  66}
  67
  68uint64_t helper_get_vmtime(void)
  69{
  70    return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
  71}
  72
  73uint64_t helper_get_walltime(void)
  74{
  75    return qemu_clock_get_ns(rtc_clock);
  76}
  77
  78void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
  79{
  80    AlphaCPU *cpu = alpha_env_get_cpu(env);
  81
  82    if (expire) {
  83        env->alarm_expire = expire;
  84        timer_mod(cpu->alarm_timer, expire);
  85    } else {
  86        timer_del(cpu->alarm_timer);
  87    }
  88}
  89
  90#endif /* CONFIG_USER_ONLY */
  91