summaryrefslogtreecommitdiffstats
path: root/target-s390x/cpu.c
blob: 189a2afc0fe1f5878cb9a7a9e4b1d63850581c92 (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
/*
 * QEMU S/390 CPU
 *
 * Copyright (c) 2009 Ulrich Hecht
 * Copyright (c) 2011 Alexander Graf
 * Copyright (c) 2012 SUSE LINUX Products GmbH
 * Copyright (c) 2012 IBM Corp.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see
 * <http://www.gnu.org/licenses/lgpl-2.1.html>
 * Contributions after 2012-12-11 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
 */

#include "cpu.h"
#include "qemu-common.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "hw/hw.h"
#include "trace.h"
#ifndef CONFIG_USER_ONLY
#include "sysemu/arch_init.h"
#endif

#define CR0_RESET       0xE0UL
#define CR14_RESET      0xC2000000UL;

/* generate CPU information for cpu -? */
void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
{
#ifdef CONFIG_KVM
    (*cpu_fprintf)(f, "s390 %16s\n", "host");
#endif
}

#ifndef CONFIG_USER_ONLY
CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
{
    CpuDefinitionInfoList *entry;
    CpuDefinitionInfo *info;

    info = g_malloc0(sizeof(*info));
    info->name = g_strdup("host");

    entry = g_malloc0(sizeof(*entry));
    entry->value = info;

    return entry;
}
#endif

static void s390_cpu_set_pc(CPUState *cs, vaddr value)
{
    S390CPU *cpu = S390_CPU(cs);

    cpu->env.psw.addr = value;
}

static bool s390_cpu_has_work(CPUState *cs)
{
    S390CPU *cpu = S390_CPU(cs);
    CPUS390XState *env = &cpu->env;

    return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
           (env->psw.mask & PSW_MASK_EXT);
}

#if !defined(CONFIG_USER_ONLY)
/* S390CPUClass::load_normal() */
static void s390_cpu_load_normal(CPUState *s)
{
    S390CPU *cpu = S390_CPU(s);
    cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
    cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
    s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
}
#endif

/* S390CPUClass::cpu_reset() */
static void s390_cpu_reset(CPUState *s)
{
    S390CPU *cpu = S390_CPU(s);
    S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
    CPUS390XState *env = &cpu->env;

    env->pfault_token = -1UL;
    scc->parent_reset(s);
    cpu->env.sigp_order = 0;
    s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
    tlb_flush(s, 1);
}

/* S390CPUClass::initial_reset() */
static void s390_cpu_initial_reset(CPUState *s)
{
    S390CPU *cpu = S390_CPU(s);
    CPUS390XState *env = &cpu->env;
    int i;

    s390_cpu_reset(s);
    /* initial reset does not touch regs,fregs and aregs */
    memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
                         offsetof(CPUS390XState, fpc));

    /* architectured initial values for CR 0 and 14 */
    env->cregs[0] = CR0_RESET;
    env->cregs[14] = CR14_RESET;

    /* architectured initial value for Breaking-Event-Address register */
    env->gbea = 1;

    env->pfault_token = -1UL;
    env->ext_index = -1;
    for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
        env->io_index[i] = -1;
    }

    /* tininess for underflow is detected before rounding */
    set_float_detect_tininess(float_tininess_before_rounding,
                              &env->fpu_status);

    /* Reset state inside the kernel that we cannot access yet from QEMU. */
    if (kvm_enabled()) {
        kvm_s390_reset_vcpu(cpu);
    }
    tlb_flush(s, 1);
}

/* CPUClass:reset() */
static void s390_cpu_full_reset(CPUState *s)
{
    S390CPU *cpu = S390_CPU(s);
    S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
    CPUS390XState *env = &cpu->env;
    int i;

    scc->parent_reset(s);
    cpu->env.sigp_order = 0;
    s390_cpu_set_state(CPU_STATE_STOPPED, cpu);

    memset(env, 0, offsetof(CPUS390XState, cpu_num));

    /* architectured initial values for CR 0 and 14 */
    env->cregs[0] = CR0_RESET;
    env->cregs[14] = CR14_RESET;

    /* architectured initial value for Breaking-Event-Address register */
    env->gbea = 1;

    env->pfault_token = -1UL;
    env->ext_index = -1;
    for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
        env->io_index[i] = -1;
    }

    /* tininess for underflow is detected before rounding */
    set_float_detect_tininess(float_tininess_before_rounding,
                              &env->fpu_status);

    /* Reset state inside the kernel that we cannot access yet from QEMU. */
    if (kvm_enabled()) {
        kvm_s390_reset_vcpu(cpu);
    }
    tlb_flush(s, 1);
}

#if !defined(CONFIG_USER_ONLY)
static void s390_cpu_machine_reset_cb(void *opaque)
{
    S390CPU *cpu = opaque;

    run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
}
#endif

static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
{
    info->mach = bfd_mach_s390_64;
    info->print_insn = print_insn_s390;
}

static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
{
    CPUState *cs = CPU(dev);
    S390CPUClass *scc = S390_CPU_GET_CLASS(dev);

    s390_cpu_gdb_init(cs);
    qemu_init_vcpu(cs);
#if !defined(CONFIG_USER_ONLY)
    run_on_cpu(cs, s390_do_cpu_full_reset, cs);
#else
    cpu_reset(cs);
#endif

    scc->parent_realize(dev, errp);
}

static void s390_cpu_initfn(Object *obj)
{
    CPUState *cs = CPU(obj);
    S390CPU *cpu = S390_CPU(obj);
    CPUS390XState *env = &cpu->env;
    static bool inited;
    static int cpu_num = 0;
#if !defined(CONFIG_USER_ONLY)
    struct tm tm;
#endif

    cs->env_ptr = env;
    cpu_exec_init(cs, &error_abort);
#if !defined(CONFIG_USER_ONLY)
    qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
    qemu_get_timedate(&tm, 0);
    env->tod_offset = TOD_UNIX_EPOCH +
                      (time2tod(mktimegm(&tm)) * 1000000000ULL);
    env->tod_basetime = 0;
    env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
    env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
    s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
#endif
    env->cpu_num = cpu_num++;

    if (tcg_enabled() && !inited) {
        inited = true;
        s390x_translate_init();
    }
}

static void s390_cpu_finalize(Object *obj)
{
#if !defined(CONFIG_USER_ONLY)
    S390CPU *cpu = S390_CPU(obj);

    qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
    g_free(cpu->irqstate);
#endif
}

#if !defined(CONFIG_USER_ONLY)
static bool disabled_wait(CPUState *cpu)
{
    return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
                            (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
}

static unsigned s390_count_running_cpus(void)
{
    CPUState *cpu;
    int nr_running = 0;

    CPU_FOREACH(cpu) {
        uint8_t state = S390_CPU(cpu)->env.cpu_state;
        if (state == CPU_STATE_OPERATING ||
            state == CPU_STATE_LOAD) {
            if (!disabled_wait(cpu)) {
                nr_running++;
            }
        }
    }

    return nr_running;
}

unsigned int s390_cpu_halt(S390CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    trace_cpu_halt(cs->cpu_index);

    if (!cs->halted) {
        cs->halted = 1;
        cs->exception_index = EXCP_HLT;
    }

    return s390_count_running_cpus();
}

void s390_cpu_unhalt(S390CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    trace_cpu_unhalt(cs->cpu_index);

    if (cs->halted) {
        cs->halted = 0;
        cs->exception_index = -1;
    }
}

unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 {
    trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);

    switch (cpu_state) {
    case CPU_STATE_STOPPED:
    case CPU_STATE_CHECK_STOP:
        /* halt the cpu for common infrastructure */
        s390_cpu_halt(cpu);
        break;
    case CPU_STATE_OPERATING:
    case CPU_STATE_LOAD:
        /* unhalt the cpu for common infrastructure */
        s390_cpu_unhalt(cpu);
        break;
    default:
        error_report("Requested CPU state is not a valid S390 CPU state: %u",
                     cpu_state);
        exit(1);
    }
    if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
        kvm_s390_set_cpu_state(cpu, cpu_state);
    }
    cpu->env.cpu_state = cpu_state;

    return s390_count_running_cpus();
}
#endif

static void s390_cpu_class_init(ObjectClass *oc, void *data)
{
    S390CPUClass *scc = S390_CPU_CLASS(oc);
    CPUClass *cc = CPU_CLASS(scc);
    DeviceClass *dc = DEVICE_CLASS(oc);

    scc->parent_realize = dc->realize;
    dc->realize = s390_cpu_realizefn;

    scc->parent_reset = cc->reset;
#if !defined(CONFIG_USER_ONLY)
    scc->load_normal = s390_cpu_load_normal;
#endif
    scc->cpu_reset = s390_cpu_reset;
    scc->initial_cpu_reset = s390_cpu_initial_reset;
    cc->reset = s390_cpu_full_reset;
    cc->has_work = s390_cpu_has_work;
    cc->do_interrupt = s390_cpu_do_interrupt;
    cc->dump_state = s390_cpu_dump_state;
    cc->set_pc = s390_cpu_set_pc;
    cc->gdb_read_register = s390_cpu_gdb_read_register;
    cc->gdb_write_register = s390_cpu_gdb_write_register;
#ifdef CONFIG_USER_ONLY
    cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
#else
    cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
    cc->vmsd = &vmstate_s390_cpu;
    cc->write_elf64_note = s390_cpu_write_elf64_note;
    cc->write_elf64_qemunote = s390_cpu_write_elf64_qemunote;
    cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
    cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
#endif
    cc->disas_set_info = s390_cpu_disas_set_info;

    cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
    cc->gdb_core_xml_file = "s390x-core64.xml";

    /*
     * Reason: s390_cpu_initfn() calls cpu_exec_init(), which saves
     * the object in cpus -> dangling pointer after final
     * object_unref().
     */
    dc->cannot_destroy_with_object_finalize_yet = true;
}

static const TypeInfo s390_cpu_type_info = {
    .name = TYPE_S390_CPU,
    .parent = TYPE_CPU,
    .instance_size = sizeof(S390CPU),
    .instance_init = s390_cpu_initfn,
    .instance_finalize = s390_cpu_finalize,
    .abstract = false,
    .class_size = sizeof(S390CPUClass),
    .class_init = s390_cpu_class_init,
};

static void s390_cpu_register_types(void)
{
    type_register_static(&s390_cpu_type_info);
}

type_init(s390_cpu_register_types)
OpenPOWER on IntegriCloud