aboutsummaryrefslogtreecommitdiff
path: root/target-s390x/cpu.c
blob: c3082b73c582e31ee5ac4e4573a47e169166d544 (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
/*
 * 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 "hw/hw.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_add_running_cpu(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;
    s390_del_running_cpu(cpu);
    scc->parent_reset(s);
#if !defined(CONFIG_USER_ONLY)
    s->halted = 1;
#endif
    tlb_flush(s, 1);
}

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

    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;

    env->pfault_token = -1UL;

#if defined(CONFIG_KVM)
    /* Reset state inside the kernel that we cannot access yet from QEMU. */
    if (kvm_enabled()) {
        if (kvm_vcpu_ioctl(s, KVM_S390_INITIAL_RESET, NULL)) {
            perror("Initial CPU reset failed");
        }
    }
#endif
}

/* 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;

    s390_del_running_cpu(cpu);

    scc->parent_reset(s);

    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;

    env->pfault_token = -1UL;

    /* set halted to 1 to make sure we can add the cpu in
     * s390_ipl_cpu code, where CPUState::halted is set back to 0
     * after incrementing the cpu counter */
#if !defined(CONFIG_USER_ONLY)
    s->halted = 1;

    if (kvm_enabled()) {
        kvm_s390_reset_vcpu(cpu);
    }
#endif
    tlb_flush(s, 1);
}

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

    cpu_reset(CPU(cpu));
}
#endif

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

    qemu_init_vcpu(cs);
    cpu_reset(cs);

    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(env);
#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);
    /* set CPUState::halted state to 1 to avoid decrementing the running
     * cpu counter in s390_cpu_reset to a negative number at
     * initial ipl */
    cs->halted = 1;
#endif
    env->cpu_num = cpu_num++;
    env->ext_index = -1;

    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);
#endif
}

static const VMStateDescription vmstate_s390_cpu = {
    .name = "cpu",
    .unmigratable = 1,
};

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->write_elf64_note = s390_cpu_write_elf64_note;
    cc->write_elf64_qemunote = s390_cpu_write_elf64_qemunote;
#endif
    dc->vmsd = &vmstate_s390_cpu;
    cc->gdb_num_core_regs = S390_NUM_REGS;
}

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)