target-alpha/sys_helper.c

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