target/nios2/op_helper.c

   1 /*
   2  * Altera Nios II helper routines.
   3  *
   4  * Copyright (C) 2012 Chris Wulff <crwulff@gmail.com>
   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 2.1 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
  18  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "cpu.h"
  23 #include "exec/helper-proto.h"
  24 #include "exec/cpu_ldst.h"
  25 #include "exec/exec-all.h"
  26 #include "qemu/main-loop.h"
  27
  28 #if !defined(CONFIG_USER_ONLY)
  29 void helper_mmu_read_debug(CPUNios2State *env, uint32_t rn)
  30 {
  31     mmu_read_debug(env, rn);
  32 }
  33
  34 void helper_mmu_write(CPUNios2State *env, uint32_t rn, uint32_t v)
  35 {
  36     mmu_write(env, rn, v);
  37 }
  38
  39 static void nios2_check_interrupts(CPUNios2State *env)
  40 {
  41     if (env->irq_pending &&
  42         (env->regs[CR_STATUS] & CR_STATUS_PIE)) {
  43         env->irq_pending = 0;
  44         cpu_interrupt(env_cpu(env), CPU_INTERRUPT_HARD);
  45     }
  46 }
  47
  48 void helper_check_interrupts(CPUNios2State *env)
  49 {
  50     qemu_mutex_lock_iothread();
  51     nios2_check_interrupts(env);
  52     qemu_mutex_unlock_iothread();
  53 }
  54 #endif /* !CONFIG_USER_ONLY */
  55
  56 void helper_raise_exception(CPUNios2State *env, uint32_t index)
  57 {
  58     CPUState *cs = env_cpu(env);
  59     cs->exception_index = index;
  60     cpu_loop_exit(cs);
  61 }