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