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); 93