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 "qom/object.h"
  30 #include "qemu-common.h"
  31 #include "qom/cpu.h"
  32 #include "sysemu/cpus.h"
  33 #include "qemu/main-loop.h"
  34
  35 unsigned long tcg_tb_size;
  36
  37 #ifndef CONFIG_USER_ONLY
  38 /* mask must never be zero, except for A20 change call */
  39 static void tcg_handle_interrupt(CPUState *cpu, int mask)
  40 {
  41     int old_mask;
  42     g_assert(qemu_mutex_iothread_locked());
  43
  44     old_mask = cpu->interrupt_request;
  45     cpu->interrupt_request |= mask;
  46
  47     /*
  48      * If called from iothread context, wake the target cpu in
  49      * case its halted.
  50      */
  51     if (!qemu_cpu_is_self(cpu)) {
  52         qemu_cpu_kick(cpu);
  53     } else {
  54         atomic_set(&cpu->icount_decr.u16.high, -1);
  55         if (use_icount &&
  56             !cpu->can_do_io
  57             && (mask & ~old_mask) != 0) {
  58             cpu_abort(cpu, "Raised interrupt while not in I/O function");
  59         }
  60     }
  61 }
  62 #endif
  63
  64 static int tcg_init(MachineState *ms)
  65 {
  66     tcg_exec_init(tcg_tb_size * 1024 * 1024);
  67     cpu_interrupt_handler = tcg_handle_interrupt;
  68     return 0;
  69 }
  70
  71 static void tcg_accel_class_init(ObjectClass *oc, void *data)
  72 {
  73     AccelClass *ac = ACCEL_CLASS(oc);
  74     ac->name = "tcg";
  75     ac->init_machine = tcg_init;
  76     ac->allowed = &tcg_allowed;
  77 }
  78
  79 #define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
  80
  81 static const TypeInfo tcg_accel_type = {
  82     .name = TYPE_TCG_ACCEL,
  83     .parent = TYPE_ACCEL,
  84     .class_init = tcg_accel_class_init,
  85 };
  86
  87 static void register_accel_types(void)
  88 {
  89     type_register_static(&tcg_accel_type);
  90 }
  91
  92 type_init(register_accel_types);