accel/tcg/tcg-all.c

   1 /*
   2  * QEMU System Emulator, accelerator interfaces
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2014 Red Hat Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "sysemu/accel.h"
  28 #include "sysemu/sysemu.h"
  29 #include "sysemu/tcg.h"
  30 #include "qom/object.h"
  31 #include "cpu.h"
  32 #include "sysemu/cpus.h"
  33 #include "qemu/main-loop.h"
  34
  35 unsigned long tcg_tb_size;
  36
  37 /* mask must never be zero, except for A20 change call */
  38 static void tcg_handle_interrupt(CPUState *cpu, int mask)
  39 {
  40     int old_mask;
  41     g_assert(qemu_mutex_iothread_locked());
  42
  43     old_mask = cpu->interrupt_request;
  44     cpu->interrupt_request |= mask;
  45
  46     /*
  47      * If called from iothread context, wake the target cpu in
  48      * case its halted.
  49      */
  50     if (!qemu_cpu_is_self(cpu)) {
  51         qemu_cpu_kick(cpu);
  52     } else {
  53         atomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1);
  54         if (use_icount &&
  55             !cpu->can_do_io
  56             && (mask & ~old_mask) != 0) {
  57             cpu_abort(cpu, "Raised interrupt while not in I/O function");
  58         }
  59     }
  60 }
  61
  62 static int tcg_init(MachineState *ms)
  63 {
  64     tcg_exec_init(tcg_tb_size * 1024 * 1024);
  65     cpu_interrupt_handler = tcg_handle_interrupt;
  66     return 0;
  67 }
  68
  69 static void tcg_accel_class_init(ObjectClass *oc, void *data)
  70 {
  71     AccelClass *ac = ACCEL_CLASS(oc);
  72     ac->name = "tcg";
  73     ac->init_machine = tcg_init;
  74     ac->allowed = &tcg_allowed;
  75 }
  76
  77 #define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
  78
  79 static const TypeInfo tcg_accel_type = {
  80     .name = TYPE_TCG_ACCEL,
  81     .parent = TYPE_ACCEL,
  82     .class_init = tcg_accel_class_init,
  83 };
  84
  85 static void register_accel_types(void)
  86 {
  87     type_register_static(&tcg_accel_type);
  88 }
  89
  90 type_init(register_accel_types);