xref: /openbmc/qemu/target/mips/cpu.c (revision f7160f32) 
1 /*
2  * QEMU MIPS CPU
3  *
4  * Copyright (c) 2012 SUSE LINUX Products GmbH
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 "internal.h"
25 #include "kvm_mips.h"
26 #include "qemu/module.h"
27 #include "sysemu/kvm.h"
28 #include "exec/exec-all.h"
29 
30 
31 static void mips_cpu_set_pc(CPUState *cs, vaddr value)
32 {
33     MIPSCPU *cpu = MIPS_CPU(cs);
34     CPUMIPSState *env = &cpu->env;
35 
36     env->active_tc.PC = value & ~(target_ulong)1;
37     if (value & 1) {
38         env->hflags |= MIPS_HFLAG_M16;
39     } else {
40         env->hflags &= ~(MIPS_HFLAG_M16);
41     }
42 }
43 
44 static void mips_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
45 {
46     MIPSCPU *cpu = MIPS_CPU(cs);
47     CPUMIPSState *env = &cpu->env;
48 
49     env->active_tc.PC = tb->pc;
50     env->hflags &= ~MIPS_HFLAG_BMASK;
51     env->hflags |= tb->flags & MIPS_HFLAG_BMASK;
52 }
53 
54 static bool mips_cpu_has_work(CPUState *cs)
55 {
56     MIPSCPU *cpu = MIPS_CPU(cs);
57     CPUMIPSState *env = &cpu->env;
58     bool has_work = false;
59 
60     /*
61      * Prior to MIPS Release 6 it is implementation dependent if non-enabled
62      * interrupts wake-up the CPU, however most of the implementations only
63      * check for interrupts that can be taken.
64      */
65     if ((cs->interrupt_request & CPU_INTERRUPT_HARD) &&
66         cpu_mips_hw_interrupts_pending(env)) {
67         if (cpu_mips_hw_interrupts_enabled(env) ||
68             (env->insn_flags & ISA_MIPS32R6)) {
69             has_work = true;
70         }
71     }
72 
73     /* MIPS-MT has the ability to halt the CPU.  */
74     if (env->CP0_Config3 & (1 << CP0C3_MT)) {
75         /*
76          * The QEMU model will issue an _WAKE request whenever the CPUs
77          * should be woken up.
78          */
79         if (cs->interrupt_request & CPU_INTERRUPT_WAKE) {
80             has_work = true;
81         }
82 
83         if (!mips_vpe_active(env)) {
84             has_work = false;
85         }
86     }
87     /* MIPS Release 6 has the ability to halt the CPU.  */
88     if (env->CP0_Config5 & (1 << CP0C5_VP)) {
89         if (cs->interrupt_request & CPU_INTERRUPT_WAKE) {
90             has_work = true;
91         }
92         if (!mips_vp_active(env)) {
93             has_work = false;
94         }
95     }
96     return has_work;
97 }
98 
99 static void mips_cpu_reset(DeviceState *dev)
100 {
101     CPUState *s = CPU(dev);
102     MIPSCPU *cpu = MIPS_CPU(s);
103     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(cpu);
104     CPUMIPSState *env = &cpu->env;
105 
106     mcc->parent_reset(dev);
107 
108     memset(env, 0, offsetof(CPUMIPSState, end_reset_fields));
109 
110     cpu_state_reset(env);
111 
112 #ifndef CONFIG_USER_ONLY
113     if (kvm_enabled()) {
114         kvm_mips_reset_vcpu(cpu);
115     }
116 #endif
117 }
118 
119 static void mips_cpu_disas_set_info(CPUState *s, disassemble_info *info)
120 {
121     MIPSCPU *cpu = MIPS_CPU(s);
122     CPUMIPSState *env = &cpu->env;
123 
124     if (!(env->insn_flags & ISA_NANOMIPS32)) {
125 #ifdef TARGET_WORDS_BIGENDIAN
126         info->print_insn = print_insn_big_mips;
127 #else
128         info->print_insn = print_insn_little_mips;
129 #endif
130     } else {
131 #if defined(CONFIG_NANOMIPS_DIS)
132         info->print_insn = print_insn_nanomips;
133 #endif
134     }
135 }
136 
137 static void mips_cpu_realizefn(DeviceState *dev, Error **errp)
138 {
139     CPUState *cs = CPU(dev);
140     MIPSCPU *cpu = MIPS_CPU(dev);
141     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(dev);
142     Error *local_err = NULL;
143 
144     cpu_exec_realizefn(cs, &local_err);
145     if (local_err != NULL) {
146         error_propagate(errp, local_err);
147         return;
148     }
149 
150     cpu_mips_realize_env(&cpu->env);
151 
152     cpu_reset(cs);
153     qemu_init_vcpu(cs);
154 
155     mcc->parent_realize(dev, errp);
156 }
157 
158 static void mips_cpu_initfn(Object *obj)
159 {
160     MIPSCPU *cpu = MIPS_CPU(obj);
161     CPUMIPSState *env = &cpu->env;
162     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(obj);
163 
164     cpu_set_cpustate_pointers(cpu);
165     env->cpu_model = mcc->cpu_def;
166 }
167 
168 static char *mips_cpu_type_name(const char *cpu_model)
169 {
170     return g_strdup_printf(MIPS_CPU_TYPE_NAME("%s"), cpu_model);
171 }
172 
173 static ObjectClass *mips_cpu_class_by_name(const char *cpu_model)
174 {
175     ObjectClass *oc;
176     char *typename;
177 
178     typename = mips_cpu_type_name(cpu_model);
179     oc = object_class_by_name(typename);
180     g_free(typename);
181     return oc;
182 }
183 
184 static void mips_cpu_class_init(ObjectClass *c, void *data)
185 {
186     MIPSCPUClass *mcc = MIPS_CPU_CLASS(c);
187     CPUClass *cc = CPU_CLASS(c);
188     DeviceClass *dc = DEVICE_CLASS(c);
189 
190     device_class_set_parent_realize(dc, mips_cpu_realizefn,
191                                     &mcc->parent_realize);
192     device_class_set_parent_reset(dc, mips_cpu_reset, &mcc->parent_reset);
193 
194     cc->class_by_name = mips_cpu_class_by_name;
195     cc->has_work = mips_cpu_has_work;
196     cc->do_interrupt = mips_cpu_do_interrupt;
197     cc->cpu_exec_interrupt = mips_cpu_exec_interrupt;
198     cc->dump_state = mips_cpu_dump_state;
199     cc->set_pc = mips_cpu_set_pc;
200     cc->synchronize_from_tb = mips_cpu_synchronize_from_tb;
201     cc->gdb_read_register = mips_cpu_gdb_read_register;
202     cc->gdb_write_register = mips_cpu_gdb_write_register;
203 #ifndef CONFIG_USER_ONLY
204     cc->do_transaction_failed = mips_cpu_do_transaction_failed;
205     cc->do_unaligned_access = mips_cpu_do_unaligned_access;
206     cc->get_phys_page_debug = mips_cpu_get_phys_page_debug;
207     cc->vmsd = &vmstate_mips_cpu;
208 #endif
209     cc->disas_set_info = mips_cpu_disas_set_info;
210 #ifdef CONFIG_TCG
211     cc->tcg_initialize = mips_tcg_init;
212     cc->tlb_fill = mips_cpu_tlb_fill;
213 #endif
214 
215     cc->gdb_num_core_regs = 73;
216     cc->gdb_stop_before_watchpoint = true;
217 }
218 
219 static const TypeInfo mips_cpu_type_info = {
220     .name = TYPE_MIPS_CPU,
221     .parent = TYPE_CPU,
222     .instance_size = sizeof(MIPSCPU),
223     .instance_init = mips_cpu_initfn,
224     .abstract = true,
225     .class_size = sizeof(MIPSCPUClass),
226     .class_init = mips_cpu_class_init,
227 };
228 
229 static void mips_cpu_cpudef_class_init(ObjectClass *oc, void *data)
230 {
231     MIPSCPUClass *mcc = MIPS_CPU_CLASS(oc);
232     mcc->cpu_def = data;
233 }
234 
235 static void mips_register_cpudef_type(const struct mips_def_t *def)
236 {
237     char *typename = mips_cpu_type_name(def->name);
238     TypeInfo ti = {
239         .name = typename,
240         .parent = TYPE_MIPS_CPU,
241         .class_init = mips_cpu_cpudef_class_init,
242         .class_data = (void *)def,
243     };
244 
245     type_register(&ti);
246     g_free(typename);
247 }
248 
249 static void mips_cpu_register_types(void)
250 {
251     int i;
252 
253     type_register_static(&mips_cpu_type_info);
254     for (i = 0; i < mips_defs_number; i++) {
255         mips_register_cpudef_type(&mips_defs[i]);
256     }
257 }
258 
259 type_init(mips_cpu_register_types)
260