aboutsummaryrefslogtreecommitdiff
path: root/qom/cpu.c
blob: d57faf3ddc71c8ee23cab094cedb6912376f662c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
/*
 * QEMU CPU model
 *
 * Copyright (c) 2012-2014 SUSE LINUX Products GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "qom/cpu.h"
#include "sysemu/hw_accel.h"
#include "qemu/notify.h"
#include "qemu/log.h"
#include "exec/log.h"
#include "qemu/error-report.h"
#include "sysemu/sysemu.h"
#include "hw/qdev-properties.h"
#include "trace-root.h"

bool cpu_exists(int64_t id)
{
    CPUState *cpu;

    CPU_FOREACH(cpu) {
        CPUClass *cc = CPU_GET_CLASS(cpu);

        if (cc->get_arch_id(cpu) == id) {
            return true;
        }
    }
    return false;
}

CPUState *cpu_generic_init(const char *typename, const char *cpu_model)
{
    char *str, *name, *featurestr;
    CPUState *cpu = NULL;
    ObjectClass *oc;
    CPUClass *cc;
    Error *err = NULL;

    str = g_strdup(cpu_model);
    name = strtok(str, ",");

    oc = cpu_class_by_name(typename, name);
    if (oc == NULL) {
        g_free(str);
        return NULL;
    }

    cc = CPU_CLASS(oc);
    featurestr = strtok(NULL, ",");
    /* TODO: all callers of cpu_generic_init() need to be converted to
     * call parse_features() only once, before calling cpu_generic_init().
     */
    cc->parse_features(object_class_get_name(oc), featurestr, &err);
    g_free(str);
    if (err != NULL) {
        goto out;
    }

    cpu = CPU(object_new(object_class_get_name(oc)));
    object_property_set_bool(OBJECT(cpu), true, "realized", &err);

out:
    if (err != NULL) {
        error_report_err(err);
        object_unref(OBJECT(cpu));
        return NULL;
    }

    return cpu;
}

bool cpu_paging_enabled(const CPUState *cpu)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);

    return cc->get_paging_enabled(cpu);
}

static bool cpu_common_get_paging_enabled(const CPUState *cpu)
{
    return false;
}

void cpu_get_memory_mapping(CPUState *cpu, MemoryMappingList *list,
                            Error **errp)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);

    cc->get_memory_mapping(cpu, list, errp);
}

static void cpu_common_get_memory_mapping(CPUState *cpu,
                                          MemoryMappingList *list,
                                          Error **errp)
{
    error_setg(errp, "Obtaining memory mappings is unsupported on this CPU.");
}

void cpu_reset_interrupt(CPUState *cpu, int mask)
{
    cpu->interrupt_request &= ~mask;
}

void cpu_exit(CPUState *cpu)
{
    atomic_set(&cpu->exit_request, 1);
    /* Ensure cpu_exec will see the exit request after TCG has exited.  */
    smp_wmb();
    atomic_set(&cpu->tcg_exit_req, 1);
}

int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
                             void *opaque)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);

    return (*cc->write_elf32_qemunote)(f, cpu, opaque);
}

static int cpu_common_write_elf32_qemunote(WriteCoreDumpFunction f,
                                           CPUState *cpu, void *opaque)
{
    return 0;
}

int cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cpu,
                         int cpuid, void *opaque)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);

    return (*cc->write_elf32_note)(f, cpu, cpuid, opaque);
}

static int cpu_common_write_elf32_note(WriteCoreDumpFunction f,
                                       CPUState *cpu, int cpuid,
                                       void *opaque)
{
    return -1;
}

int cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
                             void *opaque)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);

    return (*cc->write_elf64_qemunote)(f, cpu, opaque);
}

static int cpu_common_write_elf64_qemunote(WriteCoreDumpFunction f,
                                           CPUState *cpu, void *opaque)
{
    return 0;
}

int cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
                         int cpuid, void *opaque)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);

    return (*cc->write_elf64_note)(f, cpu, cpuid, opaque);
}

static int cpu_common_write_elf64_note(WriteCoreDumpFunction f,
                                       CPUState *cpu, int cpuid,
                                       void *opaque)
{
    return -1;
}


static int cpu_common_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg)
{
    return 0;
}

static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
{
    return 0;
}

static bool cpu_common_debug_check_watchpoint(CPUState *cpu, CPUWatchpoint *wp)
{
    /* If no extra check is required, QEMU watchpoint match can be considered
     * as an architectural match.
     */
    return true;
}

bool target_words_bigendian(void);
static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
{
    return target_words_bigendian();
}

static void cpu_common_noop(CPUState *cpu)
{
}

static bool cpu_common_exec_interrupt(CPUState *cpu, int int_req)
{
    return false;
}

void cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
                    int flags)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);

    if (cc->dump_state) {
        cpu_synchronize_state(cpu);
        cc->dump_state(cpu, f, cpu_fprintf, flags);
    }
}

void cpu_dump_statistics(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
                         int flags)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);

    if (cc->dump_statistics) {
        cc->dump_statistics(cpu, f, cpu_fprintf, flags);
    }
}

void cpu_reset(CPUState *cpu)
{
    CPUClass *klass = CPU_GET_CLASS(cpu);

    if (klass->reset != NULL) {
        (*klass->reset)(cpu);
    }

    trace_guest_cpu_reset(cpu);
}

static void cpu_common_reset(CPUState *cpu)
{
    CPUClass *cc = CPU_GET_CLASS(cpu);
    int i;

    if (qemu_loglevel_mask(CPU_LOG_RESET)) {
        qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
        log_cpu_state(cpu, cc->reset_dump_flags);
    }

    cpu->interrupt_request = 0;
    cpu->halted = 0;
    cpu->mem_io_pc = 0;
    cpu->mem_io_vaddr = 0;
    cpu->icount_extra = 0;
    cpu->icount_decr.u32 = 0;
    cpu->can_do_io = 1;
    cpu->exception_index = -1;
    cpu->crash_occurred = false;

    if (tcg_enabled()) {
        for (i = 0; i < TB_JMP_CACHE_SIZE; ++i) {
            atomic_set(&cpu->tb_jmp_cache[i], NULL);
        }

#ifdef CONFIG_SOFTMMU
        tlb_flush(cpu, 0);
#endif
    }
}

static bool cpu_common_has_work(CPUState *cs)
{
    return false;
}

ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
{
    CPUClass *cc = CPU_CLASS(object_class_by_name(typename));

    return cc->class_by_name(cpu_model);
}

static ObjectClass *cpu_common_class_by_name(const char *cpu_model)
{
    return NULL;
}

static void cpu_common_parse_features(const char *typename, char *features,
                                      Error **errp)
{
    char *featurestr; /* Single "key=value" string being parsed */
    char *val;
    static bool cpu_globals_initialized;

    /* TODO: all callers of ->parse_features() need to be changed to
     * call it only once, so we can remove this check (or change it
     * to assert(!cpu_globals_initialized).
     * Current callers of ->parse_features() are:
     * - cpu_generic_init()
     */
    if (cpu_globals_initialized) {
        return;
    }
    cpu_globals_initialized = true;

    featurestr = features ? strtok(features, ",") : NULL;

    while (featurestr) {
        val = strchr(featurestr, '=');
        if (val) {
            GlobalProperty *prop = g_new0(typeof(*prop), 1);
            *val = 0;
            val++;
            prop->driver = typename;
            prop->property = g_strdup(featurestr);
            prop->value = g_strdup(val);
            prop->errp = &error_fatal;
            qdev_prop_register_global(prop);
        } else {
            error_setg(errp, "Expected key=value format, found %s.",
                       featurestr);
            return;
        }
        featurestr = strtok(NULL, ",");
    }
}

static void cpu_common_realizefn(DeviceState *dev, Error **errp)
{
    CPUState *cpu = CPU(dev);

    if (dev->hotplugged) {
        cpu_synchronize_post_init(cpu);
        cpu_resume(cpu);
    }

    /* NOTE: latest generic point where the cpu is fully realized */
    trace_init_vcpu(cpu);
}

static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
{
    CPUState *cpu = CPU(dev);
    /* NOTE: latest generic point before the cpu is fully unrealized */
    trace_fini_vcpu(cpu);
    cpu_exec_unrealizefn(cpu);
}

static void cpu_common_initfn(Object *obj)
{
    CPUState *cpu = CPU(obj);
    CPUClass *cc = CPU_GET_CLASS(obj);

    cpu->cpu_index = UNASSIGNED_CPU_INDEX;
    cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
    /* *-user doesn't have configurable SMP topology */
    /* the default value is changed by qemu_init_vcpu() for softmmu */
    cpu->nr_cores = 1;
    cpu->nr_threads = 1;

    qemu_mutex_init(&cpu->work_mutex);
    QTAILQ_INIT(&cpu->breakpoints);
    QTAILQ_INIT(&cpu->watchpoints);

    cpu->trace_dstate = bitmap_new(trace_get_vcpu_event_count());

    cpu_exec_initfn(cpu);
}

static void cpu_common_finalize(Object *obj)
{
    CPUState *cpu = CPU(obj);
    g_free(cpu->trace_dstate);
}

static int64_t cpu_common_get_arch_id(CPUState *cpu)
{
    return cpu->cpu_index;
}

static void cpu_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    CPUClass *k = CPU_CLASS(klass);

    k->class_by_name = cpu_common_class_by_name;
    k->parse_features = cpu_common_parse_features;
    k->reset = cpu_common_reset;
    k->get_arch_id = cpu_common_get_arch_id;
    k->has_work = cpu_common_has_work;
    k->get_paging_enabled = cpu_common_get_paging_enabled;
    k->get_memory_mapping = cpu_common_get_memory_mapping;
    k->write_elf32_qemunote = cpu_common_write_elf32_qemunote;
    k->write_elf32_note = cpu_common_write_elf32_note;
    k->write_elf64_qemunote = cpu_common_write_elf64_qemunote;
    k->write_elf64_note = cpu_common_write_elf64_note;
    k->gdb_read_register = cpu_common_gdb_read_register;
    k->gdb_write_register = cpu_common_gdb_write_register;
    k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
    k->debug_excp_handler = cpu_common_noop;
    k->debug_check_watchpoint = cpu_common_debug_check_watchpoint;
    k->cpu_exec_enter = cpu_common_noop;
    k->cpu_exec_exit = cpu_common_noop;
    k->cpu_exec_interrupt = cpu_common_exec_interrupt;
    set_bit(DEVICE_CATEGORY_CPU, dc->categories);
    dc->realize = cpu_common_realizefn;
    dc->unrealize = cpu_common_unrealizefn;
    /*
     * Reason: CPUs still need special care by board code: wiring up
     * IRQs, adding reset handlers, halting non-first CPUs, ...
     */
    dc->cannot_instantiate_with_device_add_yet = true;
}

static const TypeInfo cpu_type_info = {
    .name = TYPE_CPU,
    .parent = TYPE_DEVICE,
    .instance_size = sizeof(CPUState),
    .instance_init = cpu_common_initfn,
    .instance_finalize = cpu_common_finalize,
    .abstract = true,
    .class_size = sizeof(CPUClass),
    .class_init = cpu_class_init,
};

static void cpu_register_types(void)
{
    type_register_static(&cpu_type_info);
}

type_init(cpu_register_types)