virtio-scsi: suppress virtqueue kick during processing
[qemu.git] / target / tilegx / cpu.c
1 /*
2 * QEMU TILE-Gx CPU
3 *
4 * Copyright (c) 2015 Chen Gang
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see
18 * <http://www.gnu.org/licenses/lgpl-2.1.html>
19 */
20
21 #include "qemu/osdep.h"
22 #include "qapi/error.h"
23 #include "cpu.h"
24 #include "qemu-common.h"
25 #include "hw/qdev-properties.h"
26 #include "migration/vmstate.h"
27 #include "linux-user/syscall_defs.h"
28 #include "exec/exec-all.h"
29
30 static void tilegx_cpu_dump_state(CPUState *cs, FILE *f,
31 fprintf_function cpu_fprintf, int flags)
32 {
33 static const char * const reg_names[TILEGX_R_COUNT] = {
34 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
35 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
36 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
37 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
38 "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39",
39 "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",
40 "r48", "r49", "r50", "r51", "bp", "tp", "sp", "lr"
41 };
42
43 TileGXCPU *cpu = TILEGX_CPU(cs);
44 CPUTLGState *env = &cpu->env;
45 int i;
46
47 for (i = 0; i < TILEGX_R_COUNT; i++) {
48 cpu_fprintf(f, "%-4s" TARGET_FMT_lx "%s",
49 reg_names[i], env->regs[i],
50 (i % 4) == 3 ? "\n" : " ");
51 }
52 cpu_fprintf(f, "PC " TARGET_FMT_lx " CEX " TARGET_FMT_lx "\n\n",
53 env->pc, env->spregs[TILEGX_SPR_CMPEXCH]);
54 }
55
56 TileGXCPU *cpu_tilegx_init(const char *cpu_model)
57 {
58 TileGXCPU *cpu;
59
60 cpu = TILEGX_CPU(object_new(TYPE_TILEGX_CPU));
61
62 object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
63
64 return cpu;
65 }
66
67 static void tilegx_cpu_set_pc(CPUState *cs, vaddr value)
68 {
69 TileGXCPU *cpu = TILEGX_CPU(cs);
70
71 cpu->env.pc = value;
72 }
73
74 static bool tilegx_cpu_has_work(CPUState *cs)
75 {
76 return true;
77 }
78
79 static void tilegx_cpu_reset(CPUState *s)
80 {
81 TileGXCPU *cpu = TILEGX_CPU(s);
82 TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(cpu);
83 CPUTLGState *env = &cpu->env;
84
85 tcc->parent_reset(s);
86
87 memset(env, 0, sizeof(CPUTLGState));
88 tlb_flush(s, 1);
89 }
90
91 static void tilegx_cpu_realizefn(DeviceState *dev, Error **errp)
92 {
93 CPUState *cs = CPU(dev);
94 TileGXCPUClass *tcc = TILEGX_CPU_GET_CLASS(dev);
95 Error *local_err = NULL;
96
97 cpu_exec_realizefn(cs, &local_err);
98 if (local_err != NULL) {
99 error_propagate(errp, local_err);
100 return;
101 }
102
103 cpu_reset(cs);
104 qemu_init_vcpu(cs);
105
106 tcc->parent_realize(dev, errp);
107 }
108
109 static void tilegx_cpu_initfn(Object *obj)
110 {
111 CPUState *cs = CPU(obj);
112 TileGXCPU *cpu = TILEGX_CPU(obj);
113 CPUTLGState *env = &cpu->env;
114 static bool tcg_initialized;
115
116 cs->env_ptr = env;
117
118 if (tcg_enabled() && !tcg_initialized) {
119 tcg_initialized = true;
120 tilegx_tcg_init();
121 }
122 }
123
124 static void tilegx_cpu_do_interrupt(CPUState *cs)
125 {
126 cs->exception_index = -1;
127 }
128
129 static int tilegx_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
130 int mmu_idx)
131 {
132 TileGXCPU *cpu = TILEGX_CPU(cs);
133
134 /* The sigcode field will be filled in by do_signal in main.c. */
135 cs->exception_index = TILEGX_EXCP_SIGNAL;
136 cpu->env.excaddr = address;
137 cpu->env.signo = TARGET_SIGSEGV;
138 cpu->env.sigcode = 0;
139
140 return 1;
141 }
142
143 static bool tilegx_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
144 {
145 if (interrupt_request & CPU_INTERRUPT_HARD) {
146 tilegx_cpu_do_interrupt(cs);
147 return true;
148 }
149 return false;
150 }
151
152 static void tilegx_cpu_class_init(ObjectClass *oc, void *data)
153 {
154 DeviceClass *dc = DEVICE_CLASS(oc);
155 CPUClass *cc = CPU_CLASS(oc);
156 TileGXCPUClass *tcc = TILEGX_CPU_CLASS(oc);
157
158 tcc->parent_realize = dc->realize;
159 dc->realize = tilegx_cpu_realizefn;
160
161 tcc->parent_reset = cc->reset;
162 cc->reset = tilegx_cpu_reset;
163
164 cc->has_work = tilegx_cpu_has_work;
165 cc->do_interrupt = tilegx_cpu_do_interrupt;
166 cc->cpu_exec_interrupt = tilegx_cpu_exec_interrupt;
167 cc->dump_state = tilegx_cpu_dump_state;
168 cc->set_pc = tilegx_cpu_set_pc;
169 cc->handle_mmu_fault = tilegx_cpu_handle_mmu_fault;
170 cc->gdb_num_core_regs = 0;
171 }
172
173 static const TypeInfo tilegx_cpu_type_info = {
174 .name = TYPE_TILEGX_CPU,
175 .parent = TYPE_CPU,
176 .instance_size = sizeof(TileGXCPU),
177 .instance_init = tilegx_cpu_initfn,
178 .class_size = sizeof(TileGXCPUClass),
179 .class_init = tilegx_cpu_class_init,
180 };
181
182 static void tilegx_cpu_register_types(void)
183 {
184 type_register_static(&tilegx_cpu_type_info);
185 }
186
187 type_init(tilegx_cpu_register_types)