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 static bool tcg_allowed = true; 37 38 #ifndef CONFIG_USER_ONLY 39 /* mask must never be zero, except for A20 change call */ 40 static void tcg_handle_interrupt(CPUState *cpu, int mask) 41 { 42 int old_mask; 43 g_assert(qemu_mutex_iothread_locked()); 44 45 old_mask = cpu->interrupt_request; 46 cpu->interrupt_request |= mask; 47 48 /* 49 * If called from iothread context, wake the target cpu in 50 * case its halted. 51 */ 52 if (!qemu_cpu_is_self(cpu)) { 53 qemu_cpu_kick(cpu); 54 } else { 55 cpu->icount_decr.u16.high = -1; 56 if (use_icount && 57 !cpu->can_do_io 58 && (mask & ~old_mask) != 0) { 59 cpu_abort(cpu, "Raised interrupt while not in I/O function"); 60 } 61 } 62 } 63 #endif 64 65 static int tcg_init(MachineState *ms) 66 { 67 tcg_exec_init(tcg_tb_size * 1024 * 1024); 68 cpu_interrupt_handler = tcg_handle_interrupt; 69 return 0; 70 } 71 72 static void tcg_accel_class_init(ObjectClass *oc, void *data) 73 { 74 AccelClass *ac = ACCEL_CLASS(oc); 75 ac->name = "tcg"; 76 ac->init_machine = tcg_init; 77 ac->allowed = &tcg_allowed; 78 } 79 80 #define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg") 81 82 static const TypeInfo tcg_accel_type = { 83 .name = TYPE_TCG_ACCEL, 84 .parent = TYPE_ACCEL, 85 .class_init = tcg_accel_class_init, 86 }; 87 88 static void register_accel_types(void) 89 { 90 type_register_static(&tcg_accel_type); 91 } 92 93 type_init(register_accel_types); 94