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