block: User BdrvChild callback for device name
[qemu.git] / ioport.c
1 /*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 /*
25 * splitted out ioport related stuffs from vl.c.
26 */
27
28 #include "qemu/osdep.h"
29 #include "exec/ioport.h"
30 #include "trace.h"
31 #include "exec/memory.h"
32 #include "exec/address-spaces.h"
33
34 typedef struct MemoryRegionPortioList {
35 MemoryRegion mr;
36 void *portio_opaque;
37 MemoryRegionPortio ports[];
38 } MemoryRegionPortioList;
39
40 static uint64_t unassigned_io_read(void *opaque, hwaddr addr, unsigned size)
41 {
42 return -1ULL;
43 }
44
45 static void unassigned_io_write(void *opaque, hwaddr addr, uint64_t val,
46 unsigned size)
47 {
48 }
49
50 const MemoryRegionOps unassigned_io_ops = {
51 .read = unassigned_io_read,
52 .write = unassigned_io_write,
53 .endianness = DEVICE_NATIVE_ENDIAN,
54 };
55
56 void cpu_outb(pio_addr_t addr, uint8_t val)
57 {
58 trace_cpu_out(addr, 'b', val);
59 address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
60 &val, 1);
61 }
62
63 void cpu_outw(pio_addr_t addr, uint16_t val)
64 {
65 uint8_t buf[2];
66
67 trace_cpu_out(addr, 'w', val);
68 stw_p(buf, val);
69 address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
70 buf, 2);
71 }
72
73 void cpu_outl(pio_addr_t addr, uint32_t val)
74 {
75 uint8_t buf[4];
76
77 trace_cpu_out(addr, 'l', val);
78 stl_p(buf, val);
79 address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
80 buf, 4);
81 }
82
83 uint8_t cpu_inb(pio_addr_t addr)
84 {
85 uint8_t val;
86
87 address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
88 &val, 1);
89 trace_cpu_in(addr, 'b', val);
90 return val;
91 }
92
93 uint16_t cpu_inw(pio_addr_t addr)
94 {
95 uint8_t buf[2];
96 uint16_t val;
97
98 address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED, buf, 2);
99 val = lduw_p(buf);
100 trace_cpu_in(addr, 'w', val);
101 return val;
102 }
103
104 uint32_t cpu_inl(pio_addr_t addr)
105 {
106 uint8_t buf[4];
107 uint32_t val;
108
109 address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED, buf, 4);
110 val = ldl_p(buf);
111 trace_cpu_in(addr, 'l', val);
112 return val;
113 }
114
115 void portio_list_init(PortioList *piolist,
116 Object *owner,
117 const MemoryRegionPortio *callbacks,
118 void *opaque, const char *name)
119 {
120 unsigned n = 0;
121
122 while (callbacks[n].size) {
123 ++n;
124 }
125
126 piolist->ports = callbacks;
127 piolist->nr = 0;
128 piolist->regions = g_new0(MemoryRegion *, n);
129 piolist->address_space = NULL;
130 piolist->opaque = opaque;
131 piolist->owner = owner;
132 piolist->name = name;
133 piolist->flush_coalesced_mmio = false;
134 }
135
136 void portio_list_set_flush_coalesced(PortioList *piolist)
137 {
138 piolist->flush_coalesced_mmio = true;
139 }
140
141 void portio_list_destroy(PortioList *piolist)
142 {
143 MemoryRegionPortioList *mrpio;
144 unsigned i;
145
146 for (i = 0; i < piolist->nr; ++i) {
147 mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
148 object_unparent(OBJECT(&mrpio->mr));
149 g_free(mrpio);
150 }
151 g_free(piolist->regions);
152 }
153
154 static const MemoryRegionPortio *find_portio(MemoryRegionPortioList *mrpio,
155 uint64_t offset, unsigned size,
156 bool write)
157 {
158 const MemoryRegionPortio *mrp;
159
160 for (mrp = mrpio->ports; mrp->size; ++mrp) {
161 if (offset >= mrp->offset && offset < mrp->offset + mrp->len &&
162 size == mrp->size &&
163 (write ? (bool)mrp->write : (bool)mrp->read)) {
164 return mrp;
165 }
166 }
167 return NULL;
168 }
169
170 static uint64_t portio_read(void *opaque, hwaddr addr, unsigned size)
171 {
172 MemoryRegionPortioList *mrpio = opaque;
173 const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, false);
174 uint64_t data;
175
176 data = ((uint64_t)1 << (size * 8)) - 1;
177 if (mrp) {
178 data = mrp->read(mrpio->portio_opaque, mrp->base + addr);
179 } else if (size == 2) {
180 mrp = find_portio(mrpio, addr, 1, false);
181 if (mrp) {
182 data = mrp->read(mrpio->portio_opaque, mrp->base + addr);
183 if (addr + 1 < mrp->offset + mrp->len) {
184 data |= mrp->read(mrpio->portio_opaque, mrp->base + addr + 1) << 8;
185 } else {
186 data |= 0xff00;
187 }
188 }
189 }
190 return data;
191 }
192
193 static void portio_write(void *opaque, hwaddr addr, uint64_t data,
194 unsigned size)
195 {
196 MemoryRegionPortioList *mrpio = opaque;
197 const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, true);
198
199 if (mrp) {
200 mrp->write(mrpio->portio_opaque, mrp->base + addr, data);
201 } else if (size == 2) {
202 mrp = find_portio(mrpio, addr, 1, true);
203 if (mrp) {
204 mrp->write(mrpio->portio_opaque, mrp->base + addr, data & 0xff);
205 if (addr + 1 < mrp->offset + mrp->len) {
206 mrp->write(mrpio->portio_opaque, mrp->base + addr + 1, data >> 8);
207 }
208 }
209 }
210 }
211
212 static const MemoryRegionOps portio_ops = {
213 .read = portio_read,
214 .write = portio_write,
215 .endianness = DEVICE_LITTLE_ENDIAN,
216 .valid.unaligned = true,
217 .impl.unaligned = true,
218 };
219
220 static void portio_list_add_1(PortioList *piolist,
221 const MemoryRegionPortio *pio_init,
222 unsigned count, unsigned start,
223 unsigned off_low, unsigned off_high)
224 {
225 MemoryRegionPortioList *mrpio;
226 unsigned i;
227
228 /* Copy the sub-list and null-terminate it. */
229 mrpio = g_malloc0(sizeof(MemoryRegionPortioList) +
230 sizeof(MemoryRegionPortio) * (count + 1));
231 mrpio->portio_opaque = piolist->opaque;
232 memcpy(mrpio->ports, pio_init, sizeof(MemoryRegionPortio) * count);
233 memset(mrpio->ports + count, 0, sizeof(MemoryRegionPortio));
234
235 /* Adjust the offsets to all be zero-based for the region. */
236 for (i = 0; i < count; ++i) {
237 mrpio->ports[i].offset -= off_low;
238 mrpio->ports[i].base = start + off_low;
239 }
240
241 memory_region_init_io(&mrpio->mr, piolist->owner, &portio_ops, mrpio,
242 piolist->name, off_high - off_low);
243 if (piolist->flush_coalesced_mmio) {
244 memory_region_set_flush_coalesced(&mrpio->mr);
245 }
246 memory_region_add_subregion(piolist->address_space,
247 start + off_low, &mrpio->mr);
248 piolist->regions[piolist->nr] = &mrpio->mr;
249 ++piolist->nr;
250 }
251
252 void portio_list_add(PortioList *piolist,
253 MemoryRegion *address_space,
254 uint32_t start)
255 {
256 const MemoryRegionPortio *pio, *pio_start = piolist->ports;
257 unsigned int off_low, off_high, off_last, count;
258
259 piolist->address_space = address_space;
260
261 /* Handle the first entry specially. */
262 off_last = off_low = pio_start->offset;
263 off_high = off_low + pio_start->len + pio_start->size - 1;
264 count = 1;
265
266 for (pio = pio_start + 1; pio->size != 0; pio++, count++) {
267 /* All entries must be sorted by offset. */
268 assert(pio->offset >= off_last);
269 off_last = pio->offset;
270
271 /* If we see a hole, break the region. */
272 if (off_last > off_high) {
273 portio_list_add_1(piolist, pio_start, count, start, off_low,
274 off_high);
275 /* ... and start collecting anew. */
276 pio_start = pio;
277 off_low = off_last;
278 off_high = off_low + pio->len + pio_start->size - 1;
279 count = 0;
280 } else if (off_last + pio->len > off_high) {
281 off_high = off_last + pio->len + pio_start->size - 1;
282 }
283 }
284
285 /* There will always be an open sub-list. */
286 portio_list_add_1(piolist, pio_start, count, start, off_low, off_high);
287 }
288
289 void portio_list_del(PortioList *piolist)
290 {
291 MemoryRegionPortioList *mrpio;
292 unsigned i;
293
294 for (i = 0; i < piolist->nr; ++i) {
295 mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
296 memory_region_del_subregion(piolist->address_space, &mrpio->mr);
297 }
298 }