hw/arm/bcm2836: Only provide "enabled-cpus" property to multicore SoCs
[qemu.git] / hw / core / register.c
1 /*
2 * Register Definition API
3 *
4 * Copyright (c) 2016 Xilinx Inc.
5 * Copyright (c) 2013 Peter Crosthwaite <peter.crosthwaite@xilinx.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * for more details.
16 */
17
18 #include "qemu/osdep.h"
19 #include "hw/register.h"
20 #include "qemu/log.h"
21 #include "qemu/module.h"
22
23 static inline void register_write_val(RegisterInfo *reg, uint64_t val)
24 {
25 g_assert(reg->data);
26
27 switch (reg->data_size) {
28 case 1:
29 *(uint8_t *)reg->data = val;
30 break;
31 case 2:
32 *(uint16_t *)reg->data = val;
33 break;
34 case 4:
35 *(uint32_t *)reg->data = val;
36 break;
37 case 8:
38 *(uint64_t *)reg->data = val;
39 break;
40 default:
41 g_assert_not_reached();
42 }
43 }
44
45 static inline uint64_t register_read_val(RegisterInfo *reg)
46 {
47 switch (reg->data_size) {
48 case 1:
49 return *(uint8_t *)reg->data;
50 case 2:
51 return *(uint16_t *)reg->data;
52 case 4:
53 return *(uint32_t *)reg->data;
54 case 8:
55 return *(uint64_t *)reg->data;
56 default:
57 g_assert_not_reached();
58 }
59 return 0; /* unreachable */
60 }
61
62 static inline uint64_t register_enabled_mask(int data_size, unsigned size)
63 {
64 if (data_size < size) {
65 size = data_size;
66 }
67
68 return MAKE_64BIT_MASK(0, size * 8);
69 }
70
71 void register_write(RegisterInfo *reg, uint64_t val, uint64_t we,
72 const char *prefix, bool debug)
73 {
74 uint64_t old_val, new_val, test, no_w_mask;
75 const RegisterAccessInfo *ac;
76
77 assert(reg);
78
79 ac = reg->access;
80
81 if (!ac || !ac->name) {
82 qemu_log_mask(LOG_GUEST_ERROR, "%s: write to undefined device state "
83 "(written value: %#" PRIx64 ")\n", prefix, val);
84 return;
85 }
86
87 old_val = reg->data ? register_read_val(reg) : ac->reset;
88
89 test = (old_val ^ val) & ac->rsvd;
90 if (test) {
91 qemu_log_mask(LOG_GUEST_ERROR, "%s: change of value in reserved bit"
92 "fields: %#" PRIx64 ")\n", prefix, test);
93 }
94
95 test = val & ac->unimp;
96 if (test) {
97 qemu_log_mask(LOG_UNIMP,
98 "%s:%s writing %#" PRIx64 " to unimplemented bits:" \
99 " %#" PRIx64 "\n",
100 prefix, reg->access->name, val, ac->unimp);
101 }
102
103 /* Create the no write mask based on the read only, write to clear and
104 * reserved bit masks.
105 */
106 no_w_mask = ac->ro | ac->w1c | ac->rsvd | ~we;
107 new_val = (val & ~no_w_mask) | (old_val & no_w_mask);
108 new_val &= ~(val & ac->w1c);
109
110 if (ac->pre_write) {
111 new_val = ac->pre_write(reg, new_val);
112 }
113
114 if (debug) {
115 qemu_log("%s:%s: write of value %#" PRIx64 "\n", prefix, ac->name,
116 new_val);
117 }
118
119 register_write_val(reg, new_val);
120
121 if (ac->post_write) {
122 ac->post_write(reg, new_val);
123 }
124 }
125
126 uint64_t register_read(RegisterInfo *reg, uint64_t re, const char* prefix,
127 bool debug)
128 {
129 uint64_t ret;
130 const RegisterAccessInfo *ac;
131
132 assert(reg);
133
134 ac = reg->access;
135 if (!ac || !ac->name) {
136 qemu_log_mask(LOG_GUEST_ERROR, "%s: read from undefined device state\n",
137 prefix);
138 return 0;
139 }
140
141 ret = reg->data ? register_read_val(reg) : ac->reset;
142
143 register_write_val(reg, ret & ~(ac->cor & re));
144
145 /* Mask based on the read enable size */
146 ret &= re;
147
148 if (ac->post_read) {
149 ret = ac->post_read(reg, ret);
150 }
151
152 if (debug) {
153 qemu_log("%s:%s: read of value %#" PRIx64 "\n", prefix,
154 ac->name, ret);
155 }
156
157 return ret;
158 }
159
160 void register_reset(RegisterInfo *reg)
161 {
162 const RegisterAccessInfo *ac;
163
164 g_assert(reg);
165
166 if (!reg->data || !reg->access) {
167 return;
168 }
169
170 ac = reg->access;
171
172 register_write_val(reg, reg->access->reset);
173
174 if (ac->post_write) {
175 ac->post_write(reg, reg->access->reset);
176 }
177 }
178
179 void register_write_memory(void *opaque, hwaddr addr,
180 uint64_t value, unsigned size)
181 {
182 RegisterInfoArray *reg_array = opaque;
183 RegisterInfo *reg = NULL;
184 uint64_t we;
185 int i;
186
187 for (i = 0; i < reg_array->num_elements; i++) {
188 if (reg_array->r[i]->access->addr == addr) {
189 reg = reg_array->r[i];
190 break;
191 }
192 }
193
194 if (!reg) {
195 qemu_log_mask(LOG_GUEST_ERROR, "%s: write to unimplemented register " \
196 "at address: %#" PRIx64 "\n", reg_array->prefix, addr);
197 return;
198 }
199
200 /* Generate appropriate write enable mask */
201 we = register_enabled_mask(reg->data_size, size);
202
203 register_write(reg, value, we, reg_array->prefix,
204 reg_array->debug);
205 }
206
207 uint64_t register_read_memory(void *opaque, hwaddr addr,
208 unsigned size)
209 {
210 RegisterInfoArray *reg_array = opaque;
211 RegisterInfo *reg = NULL;
212 uint64_t read_val;
213 uint64_t re;
214 int i;
215
216 for (i = 0; i < reg_array->num_elements; i++) {
217 if (reg_array->r[i]->access->addr == addr) {
218 reg = reg_array->r[i];
219 break;
220 }
221 }
222
223 if (!reg) {
224 qemu_log_mask(LOG_GUEST_ERROR, "%s: read to unimplemented register " \
225 "at address: %#" PRIx64 "\n", reg_array->prefix, addr);
226 return 0;
227 }
228
229 /* Generate appropriate read enable mask */
230 re = register_enabled_mask(reg->data_size, size);
231
232 read_val = register_read(reg, re, reg_array->prefix,
233 reg_array->debug);
234
235 return extract64(read_val, 0, size * 8);
236 }
237
238 static RegisterInfoArray *register_init_block(DeviceState *owner,
239 const RegisterAccessInfo *rae,
240 int num, RegisterInfo *ri,
241 void *data,
242 const MemoryRegionOps *ops,
243 bool debug_enabled,
244 uint64_t memory_size,
245 size_t data_size_bits)
246 {
247 const char *device_prefix = object_get_typename(OBJECT(owner));
248 RegisterInfoArray *r_array = g_new0(RegisterInfoArray, 1);
249 int data_size = data_size_bits >> 3;
250 int i;
251
252 r_array->r = g_new0(RegisterInfo *, num);
253 r_array->num_elements = num;
254 r_array->debug = debug_enabled;
255 r_array->prefix = device_prefix;
256
257 for (i = 0; i < num; i++) {
258 int index = rae[i].addr / data_size;
259 RegisterInfo *r = &ri[index];
260
261 if (data + data_size * index == 0 || !&rae[i]) {
262 continue;
263 }
264
265 /* Init the register, this will zero it. */
266 object_initialize((void *)r, sizeof(*r), TYPE_REGISTER);
267
268 /* Set the properties of the register */
269 r->data = data + data_size * index;
270 r->data_size = data_size;
271 r->access = &rae[i];
272 r->opaque = owner;
273
274 r_array->r[i] = r;
275 }
276
277 memory_region_init_io(&r_array->mem, OBJECT(owner), ops, r_array,
278 device_prefix, memory_size);
279
280 return r_array;
281 }
282
283 RegisterInfoArray *register_init_block8(DeviceState *owner,
284 const RegisterAccessInfo *rae,
285 int num, RegisterInfo *ri,
286 uint8_t *data,
287 const MemoryRegionOps *ops,
288 bool debug_enabled,
289 uint64_t memory_size)
290 {
291 return register_init_block(owner, rae, num, ri, (void *)
292 data, ops, debug_enabled, memory_size, 8);
293 }
294
295 RegisterInfoArray *register_init_block32(DeviceState *owner,
296 const RegisterAccessInfo *rae,
297 int num, RegisterInfo *ri,
298 uint32_t *data,
299 const MemoryRegionOps *ops,
300 bool debug_enabled,
301 uint64_t memory_size)
302 {
303 return register_init_block(owner, rae, num, ri, (void *)
304 data, ops, debug_enabled, memory_size, 32);
305 }
306
307 void register_finalize_block(RegisterInfoArray *r_array)
308 {
309 object_unparent(OBJECT(&r_array->mem));
310 g_free(r_array->r);
311 g_free(r_array);
312 }
313
314 static void register_class_init(ObjectClass *oc, void *data)
315 {
316 DeviceClass *dc = DEVICE_CLASS(oc);
317
318 /* Reason: needs to be wired up to work */
319 dc->user_creatable = false;
320 }
321
322 static const TypeInfo register_info = {
323 .name = TYPE_REGISTER,
324 .parent = TYPE_DEVICE,
325 .class_init = register_class_init,
326 .instance_size = sizeof(RegisterInfo),
327 };
328
329 static void register_register_types(void)
330 {
331 type_register_static(&register_info);
332 }
333
334 type_init(register_register_types)