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1 /*
2  * QEMU Alpha CPU
3  *
4  * Copyright (c) 2007 Jocelyn Mayer
5  * Copyright (c) 2012 SUSE LINUX Products GmbH
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, see
19  * <http://www.gnu.org/licenses/lgpl-2.1.html>
20  */
21
22 #include "qemu/osdep.h"
23 #include "qapi/error.h"
24 #include "cpu.h"
25 #include "qemu-common.h"
26 #include "migration/vmstate.h"
27 #include "exec/exec-all.h"
28
29
30 static void alpha_cpu_set_pc(CPUState *cs, vaddr value)
31 {
32     AlphaCPU *cpu = ALPHA_CPU(cs);
33
34     cpu->env.pc = value;
35 }
36
37 static bool alpha_cpu_has_work(CPUState *cs)
38 {
39     /* Here we are checking to see if the CPU should wake up from HALT.
40        We will have gotten into this state only for WTINT from PALmode.  */
41     /* ??? I'm not sure how the IPL state works with WTINT to keep a CPU
42        asleep even if (some) interrupts have been asserted.  For now,
43        assume that if a CPU really wants to stay asleep, it will mask
44        interrupts at the chipset level, which will prevent these bits
45        from being set in the first place.  */
46     return cs->interrupt_request & (CPU_INTERRUPT_HARD
47                                     | CPU_INTERRUPT_TIMER
48                                     | CPU_INTERRUPT_SMP
49                                     | CPU_INTERRUPT_MCHK);
50 }
51
52 static void alpha_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
53 {
54     info->mach = bfd_mach_alpha_ev6;
55     info->print_insn = print_insn_alpha;
56 }
57
58 static void alpha_cpu_realizefn(DeviceState *dev, Error **errp)
59 {
60     CPUState *cs = CPU(dev);
61     AlphaCPUClass *acc = ALPHA_CPU_GET_CLASS(dev);
62
63     qemu_init_vcpu(cs);
64
65     acc->parent_realize(dev, errp);
66 }
67
68 /* Sort alphabetically by type name. */
69 static gint alpha_cpu_list_compare(gconstpointer a, gconstpointer b)
70 {
71     ObjectClass *class_a = (ObjectClass *)a;
72     ObjectClass *class_b = (ObjectClass *)b;
73     const char *name_a, *name_b;
74
75     name_a = object_class_get_name(class_a);
76     name_b = object_class_get_name(class_b);
77     return strcmp(name_a, name_b);
78 }
79
80 static void alpha_cpu_list_entry(gpointer data, gpointer user_data)
81 {
82     ObjectClass *oc = data;
83     CPUListState *s = user_data;
84
85     (*s->cpu_fprintf)(s->file, "  %s\n",
86                       object_class_get_name(oc));
87 }
88
89 void alpha_cpu_list(FILE *f, fprintf_function cpu_fprintf)
90 {
91     CPUListState s = {
92         .file = f,
93         .cpu_fprintf = cpu_fprintf,
94     };
95     GSList *list;
96
97     list = object_class_get_list(TYPE_ALPHA_CPU, false);
98     list = g_slist_sort(list, alpha_cpu_list_compare);
99     (*cpu_fprintf)(f, "Available CPUs:\n");
100     g_slist_foreach(list, alpha_cpu_list_entry, &s);
101     g_slist_free(list);
102 }
103
104 /* Models */
105
106 #define TYPE(model) model "-" TYPE_ALPHA_CPU
107
108 typedef struct AlphaCPUAlias {
109     const char *alias;
110     const char *typename;
111 } AlphaCPUAlias;
112
113 static const AlphaCPUAlias alpha_cpu_aliases[] = {
114     { "21064",   TYPE("ev4") },
115     { "21164",   TYPE("ev5") },
116     { "21164a",  TYPE("ev56") },
117     { "21164pc", TYPE("pca56") },
118     { "21264",   TYPE("ev6") },
119     { "21264a",  TYPE("ev67") },
120 };
121
122 static ObjectClass *alpha_cpu_class_by_name(const char *cpu_model)
123 {
124     ObjectClass *oc = NULL;
125     char *typename;
126     int i;
127
128     if (cpu_model == NULL) {
129         return NULL;
130     }
131
132     oc = object_class_by_name(cpu_model);
133     if (oc != NULL && object_class_dynamic_cast(oc, TYPE_ALPHA_CPU) != NULL &&
134         !object_class_is_abstract(oc)) {
135         return oc;
136     }
137
138     for (i = 0; i < ARRAY_SIZE(alpha_cpu_aliases); i++) {
139         if (strcmp(cpu_model, alpha_cpu_aliases[i].alias) == 0) {
140             oc = object_class_by_name(alpha_cpu_aliases[i].typename);
141             assert(oc != NULL && !object_class_is_abstract(oc));
142             return oc;
143         }
144     }
145
146     typename = g_strdup_printf("%s-" TYPE_ALPHA_CPU, cpu_model);
147     oc = object_class_by_name(typename);
148     g_free(typename);
149     if (oc != NULL && object_class_is_abstract(oc)) {
150         oc = NULL;
151     }
152     return oc;
153 }
154
155 AlphaCPU *cpu_alpha_init(const char *cpu_model)
156 {
157     AlphaCPU *cpu;
158     ObjectClass *cpu_class;
159
160     cpu_class = alpha_cpu_class_by_name(cpu_model);
161     if (cpu_class == NULL) {
162         /* Default to ev67; no reason not to emulate insns by default.  */
163         cpu_class = object_class_by_name(TYPE("ev67"));
164     }
165     cpu = ALPHA_CPU(object_new(object_class_get_name(cpu_class)));
166
167     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
168
169     return cpu;
170 }
171
172 static void ev4_cpu_initfn(Object *obj)
173 {
174     AlphaCPU *cpu = ALPHA_CPU(obj);
175     CPUAlphaState *env = &cpu->env;
176
177     env->implver = IMPLVER_2106x;
178 }
179
180 static const TypeInfo ev4_cpu_type_info = {
181     .name = TYPE("ev4"),
182     .parent = TYPE_ALPHA_CPU,
183     .instance_init = ev4_cpu_initfn,
184 };
185
186 static void ev5_cpu_initfn(Object *obj)
187 {
188     AlphaCPU *cpu = ALPHA_CPU(obj);
189     CPUAlphaState *env = &cpu->env;
190
191     env->implver = IMPLVER_21164;
192 }
193
194 static const TypeInfo ev5_cpu_type_info = {
195     .name = TYPE("ev5"),
196     .parent = TYPE_ALPHA_CPU,
197     .instance_init = ev5_cpu_initfn,
198 };
199
200 static void ev56_cpu_initfn(Object *obj)
201 {
202     AlphaCPU *cpu = ALPHA_CPU(obj);
203     CPUAlphaState *env = &cpu->env;
204
205     env->amask |= AMASK_BWX;
206 }
207
208 static const TypeInfo ev56_cpu_type_info = {
209     .name = TYPE("ev56"),
210     .parent = TYPE("ev5"),
211     .instance_init = ev56_cpu_initfn,
212 };
213
214 static void pca56_cpu_initfn(Object *obj)
215 {
216     AlphaCPU *cpu = ALPHA_CPU(obj);
217     CPUAlphaState *env = &cpu->env;
218
219     env->amask |= AMASK_MVI;
220 }
221
222 static const TypeInfo pca56_cpu_type_info = {
223     .name = TYPE("pca56"),
224     .parent = TYPE("ev56"),
225     .instance_init = pca56_cpu_initfn,
226 };
227
228 static void ev6_cpu_initfn(Object *obj)
229 {
230     AlphaCPU *cpu = ALPHA_CPU(obj);
231     CPUAlphaState *env = &cpu->env;
232
233     env->implver = IMPLVER_21264;
234     env->amask = AMASK_BWX | AMASK_FIX | AMASK_MVI | AMASK_TRAP;
235 }
236
237 static const TypeInfo ev6_cpu_type_info = {
238     .name = TYPE("ev6"),
239     .parent = TYPE_ALPHA_CPU,
240     .instance_init = ev6_cpu_initfn,
241 };
242
243 static void ev67_cpu_initfn(Object *obj)
244 {
245     AlphaCPU *cpu = ALPHA_CPU(obj);
246     CPUAlphaState *env = &cpu->env;
247
248     env->amask |= AMASK_CIX | AMASK_PREFETCH;
249 }
250
251 static const TypeInfo ev67_cpu_type_info = {
252     .name = TYPE("ev67"),
253     .parent = TYPE("ev6"),
254     .instance_init = ev67_cpu_initfn,
255 };
256
257 static const TypeInfo ev68_cpu_type_info = {
258     .name = TYPE("ev68"),
259     .parent = TYPE("ev67"),
260 };
261
262 static void alpha_cpu_initfn(Object *obj)
263 {
264     CPUState *cs = CPU(obj);
265     AlphaCPU *cpu = ALPHA_CPU(obj);
266     CPUAlphaState *env = &cpu->env;
267
268     cs->env_ptr = env;
269     cpu_exec_init(cs, &error_abort);
270     tlb_flush(cs, 1);
271
272     alpha_translate_init();
273
274 #if defined(CONFIG_USER_ONLY)
275     env->ps = PS_USER_MODE;
276     cpu_alpha_store_fpcr(env, (FPCR_INVD | FPCR_DZED | FPCR_OVFD
277                                | FPCR_UNFD | FPCR_INED | FPCR_DNOD
278                                | FPCR_DYN_NORMAL));
279 #endif
280     env->lock_addr = -1;
281     env->fen = 1;
282 }
283
284 static void alpha_cpu_class_init(ObjectClass *oc, void *data)
285 {
286     DeviceClass *dc = DEVICE_CLASS(oc);
287     CPUClass *cc = CPU_CLASS(oc);
288     AlphaCPUClass *acc = ALPHA_CPU_CLASS(oc);
289
290     acc->parent_realize = dc->realize;
291     dc->realize = alpha_cpu_realizefn;
292
293     cc->class_by_name = alpha_cpu_class_by_name;
294     cc->has_work = alpha_cpu_has_work;
295     cc->do_interrupt = alpha_cpu_do_interrupt;
296     cc->cpu_exec_interrupt = alpha_cpu_exec_interrupt;
297     cc->dump_state = alpha_cpu_dump_state;
298     cc->set_pc = alpha_cpu_set_pc;
299     cc->gdb_read_register = alpha_cpu_gdb_read_register;
300     cc->gdb_write_register = alpha_cpu_gdb_write_register;
301 #ifdef CONFIG_USER_ONLY
302     cc->handle_mmu_fault = alpha_cpu_handle_mmu_fault;
303 #else
304     cc->do_unassigned_access = alpha_cpu_unassigned_access;
305     cc->do_unaligned_access = alpha_cpu_do_unaligned_access;
306     cc->get_phys_page_debug = alpha_cpu_get_phys_page_debug;
307     dc->vmsd = &vmstate_alpha_cpu;
308 #endif
309     cc->disas_set_info = alpha_cpu_disas_set_info;
310
311     cc->gdb_num_core_regs = 67;
312
313     /*
314      * Reason: alpha_cpu_initfn() calls cpu_exec_init(), which saves
315      * the object in cpus -> dangling pointer after final
316      * object_unref().
317      */
318     dc->cannot_destroy_with_object_finalize_yet = true;
319 }
320
321 static const TypeInfo alpha_cpu_type_info = {
322     .name = TYPE_ALPHA_CPU,
323     .parent = TYPE_CPU,
324     .instance_size = sizeof(AlphaCPU),
325     .instance_init = alpha_cpu_initfn,
326     .abstract = true,
327     .class_size = sizeof(AlphaCPUClass),
328     .class_init = alpha_cpu_class_init,
329 };
330
331 static void alpha_cpu_register_types(void)
332 {
333     type_register_static(&alpha_cpu_type_info);
334     type_register_static(&ev4_cpu_type_info);
335     type_register_static(&ev5_cpu_type_info);
336     type_register_static(&ev56_cpu_type_info);
337     type_register_static(&pca56_cpu_type_info);
338     type_register_static(&ev6_cpu_type_info);
339     type_register_static(&ev67_cpu_type_info);
340     type_register_static(&ev68_cpu_type_info);
341 }
342
343 type_init(alpha_cpu_register_types)
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