accel/tcg/tcg-cpus.c

   1 /*
   2  * QEMU TCG vCPU common functionality
   3  *
   4  * Functionality common to all TCG vCPU variants: mttcg, rr and icount.
   5  *
   6  * Copyright (c) 2003-2008 Fabrice Bellard
   7  * Copyright (c) 2014 Red Hat Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qemu-common.h"
  30 #include "sysemu/tcg.h"
  31 #include "sysemu/replay.h"
  32 #include "qemu/main-loop.h"
  33 #include "qemu/guest-random.h"
  34 #include "exec/exec-all.h"
  35 #include "hw/boards.h"
  36
  37 #include "tcg-cpus.h"
  38
  39 /* common functionality among all TCG variants */
  40
  41 void tcg_cpus_destroy(CPUState *cpu)
  42 {
  43     cpu_thread_signal_destroyed(cpu);
  44 }
  45
  46 int tcg_cpus_exec(CPUState *cpu)
  47 {
  48     int ret;
  49 #ifdef CONFIG_PROFILER
  50     int64_t ti;
  51 #endif
  52     assert(tcg_enabled());
  53 #ifdef CONFIG_PROFILER
  54     ti = profile_getclock();
  55 #endif
  56     cpu_exec_start(cpu);
  57     ret = cpu_exec(cpu);
  58     cpu_exec_end(cpu);
  59 #ifdef CONFIG_PROFILER
  60     qatomic_set(&tcg_ctx->prof.cpu_exec_time,
  61                 tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti);
  62 #endif
  63     return ret;
  64 }
  65
  66 /* mask must never be zero, except for A20 change call */
  67 void tcg_cpus_handle_interrupt(CPUState *cpu, int mask)
  68 {
  69     g_assert(qemu_mutex_iothread_locked());
  70
  71     cpu->interrupt_request |= mask;
  72
  73     /*
  74      * If called from iothread context, wake the target cpu in
  75      * case its halted.
  76      */
  77     if (!qemu_cpu_is_self(cpu)) {
  78         qemu_cpu_kick(cpu);
  79     } else {
  80         qatomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1);
  81     }
  82 }