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 "helper.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_real_ticks();
  38 #endif
  39 }
  40
  41 /* PALcode support special instructions */
  42 #ifndef CONFIG_USER_ONLY
  43 void helper_hw_ret(CPUAlphaState *env, uint64_t a)
  44 {
  45     env->pc = a & ~3;
  46     env->intr_flag = 0;
  47     env->lock_addr = -1;
  48     if ((a & 1) == 0) {
  49         env->pal_mode = 0;
  50         swap_shadow_regs(env);
  51     }
  52 }
  53
  54 void helper_call_pal(CPUAlphaState *env, uint64_t pc, uint64_t entry_ofs)
  55 {
  56     int pal_mode = env->pal_mode;
  57     env->exc_addr = pc | pal_mode;
  58     env->pc = env->palbr + entry_ofs;
  59     if (!pal_mode) {
  60         env->pal_mode = 1;
  61         swap_shadow_regs(env);
  62     }
  63 }
  64
  65 void helper_tbia(CPUAlphaState *env)
  66 {
  67     tlb_flush(env, 1);
  68 }
  69
  70 void helper_tbis(CPUAlphaState *env, uint64_t p)
  71 {
  72     tlb_flush_page(env, p);
  73 }
  74
  75 void helper_tb_flush(CPUAlphaState *env)
  76 {
  77     tb_flush(env);
  78 }
  79
  80 void helper_halt(uint64_t restart)
  81 {
  82     if (restart) {
  83         qemu_system_reset_request();
  84     } else {
  85         qemu_system_shutdown_request();
  86     }
  87 }
  88
  89 uint64_t helper_get_vmtime(void)
  90 {
  91     return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
  92 }
  93
  94 uint64_t helper_get_walltime(void)
  95 {
  96     return qemu_clock_get_ns(rtc_clock);
  97 }
  98
  99 void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
 100 {
 101     AlphaCPU *cpu = alpha_env_get_cpu(env);
 102
 103     if (expire) {
 104         env->alarm_expire = expire;
 105         timer_mod(cpu->alarm_timer, expire);
 106     } else {
 107         timer_del(cpu->alarm_timer);
 108     }
 109 }
 110
 111 #endif /* CONFIG_USER_ONLY */