virtio-net: check the existence of peer before accessing vDPA config
[qemu.git] / hw / xtensa / pic_cpu.c
1 /*
2 * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the Open Source and Linux Lab nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "qemu/osdep.h"
29 #include "cpu.h"
30 #include "hw/irq.h"
31 #include "qemu/log.h"
32 #include "qemu/timer.h"
33
34 void check_interrupts(CPUXtensaState *env)
35 {
36 CPUState *cs = env_cpu(env);
37 int minlevel = xtensa_get_cintlevel(env);
38 uint32_t int_set_enabled = env->sregs[INTSET] & env->sregs[INTENABLE];
39 int level;
40
41 for (level = env->config->nlevel; level > minlevel; --level) {
42 if (env->config->level_mask[level] & int_set_enabled) {
43 env->pending_irq_level = level;
44 cpu_interrupt(cs, CPU_INTERRUPT_HARD);
45 qemu_log_mask(CPU_LOG_INT,
46 "%s level = %d, cintlevel = %d, "
47 "pc = %08x, a0 = %08x, ps = %08x, "
48 "intset = %08x, intenable = %08x, "
49 "ccount = %08x\n",
50 __func__, level, xtensa_get_cintlevel(env),
51 env->pc, env->regs[0], env->sregs[PS],
52 env->sregs[INTSET], env->sregs[INTENABLE],
53 env->sregs[CCOUNT]);
54 return;
55 }
56 }
57 env->pending_irq_level = 0;
58 cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
59 }
60
61 static void xtensa_set_irq(void *opaque, int irq, int active)
62 {
63 CPUXtensaState *env = opaque;
64
65 if (irq >= env->config->ninterrupt) {
66 qemu_log("%s: bad IRQ %d\n", __func__, irq);
67 } else {
68 uint32_t irq_bit = 1 << irq;
69
70 if (active) {
71 atomic_or(&env->sregs[INTSET], irq_bit);
72 } else if (env->config->interrupt[irq].inttype == INTTYPE_LEVEL) {
73 atomic_and(&env->sregs[INTSET], ~irq_bit);
74 }
75
76 check_interrupts(env);
77 }
78 }
79
80 static void xtensa_ccompare_cb(void *opaque)
81 {
82 XtensaCcompareTimer *ccompare = opaque;
83 CPUXtensaState *env = ccompare->env;
84 unsigned i = ccompare - env->ccompare;
85
86 qemu_set_irq(env->irq_inputs[env->config->timerint[i]], 1);
87 }
88
89 static void xtensa_set_runstall(void *opaque, int irq, int active)
90 {
91 CPUXtensaState *env = opaque;
92 xtensa_runstall(env, active);
93 }
94
95 void xtensa_irq_init(CPUXtensaState *env)
96 {
97 unsigned i;
98
99 env->irq_inputs = qemu_allocate_irqs(xtensa_set_irq, env,
100 env->config->ninterrupt);
101 if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) {
102 env->time_base = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
103 env->ccount_base = env->sregs[CCOUNT];
104 for (i = 0; i < env->config->nccompare; ++i) {
105 env->ccompare[i].env = env;
106 env->ccompare[i].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
107 xtensa_ccompare_cb, env->ccompare + i);
108 }
109 }
110 for (i = 0; i < env->config->nextint; ++i) {
111 unsigned irq = env->config->extint[i];
112
113 env->ext_irq_inputs[i] = env->irq_inputs[irq];
114 }
115 env->runstall_irq = qemu_allocate_irq(xtensa_set_runstall, env, 0);
116 }
117
118 qemu_irq *xtensa_get_extints(CPUXtensaState *env)
119 {
120 return env->ext_irq_inputs;
121 }
122
123 qemu_irq xtensa_get_runstall(CPUXtensaState *env)
124 {
125 return env->runstall_irq;
126 }