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