source: mainline/uspace/srv/bd/gxe_bd/gxe_bd.c@ e1e4192

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since e1e4192 was b16e77d, checked in by Martin Decky <martin@…>, 13 years ago

trivial changes (error code reporting, messages)
  • Property mode set to 100644
File size: 7.6 KB
Line 
1/*
2 * Copyright (c) 2009 Jiri Svoboda
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup bd
30 * @{
31 */
32
33/**
34 * @file
35 * @brief GXemul disk driver
36 */
37
38#include <stdio.h>
39#include <libarch/ddi.h>
40#include <ddi.h>
41#include <ipc/bd.h>
42#include <async.h>
43#include <as.h>
44#include <fibril_synch.h>
45#include <loc.h>
46#include <sys/types.h>
47#include <errno.h>
48#include <macros.h>
49#include <task.h>
50
51#define NAME "gxe_bd"
52#define NAMESPACE "bd"
53
54enum {
55 CTL_READ_START = 0,
56 CTL_WRITE_START = 1,
57};
58
59enum {
60 STATUS_FAILURE = 0
61};
62
63enum {
64 MAX_DISKS = 2
65};
66
67typedef struct {
68 uint32_t offset_lo;
69 uint32_t pad0;
70 uint32_t offset_hi;
71 uint32_t pad1;
72
73 uint32_t disk_id;
74 uint32_t pad2[3];
75
76 uint32_t control;
77 uint32_t pad3[3];
78
79 uint32_t status;
80
81 uint32_t pad4[3];
82 uint8_t pad5[0x3fc0];
83
84 uint8_t buffer[512];
85} gxe_bd_t;
86
87
88static const size_t block_size = 512;
89static size_t comm_size;
90
91static uintptr_t dev_physical = 0x13000000;
92static gxe_bd_t *dev;
93
94static service_id_t service_id[MAX_DISKS];
95
96static fibril_mutex_t dev_lock[MAX_DISKS];
97
98static int gxe_bd_init(void);
99static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall, void *);
100static int gxe_bd_read_blocks(int disk_id, uint64_t ba, unsigned cnt,
101 void *buf);
102static int gxe_bd_write_blocks(int disk_id, uint64_t ba, unsigned cnt,
103 const void *buf);
104static int gxe_bd_read_block(int disk_id, uint64_t ba, void *buf);
105static int gxe_bd_write_block(int disk_id, uint64_t ba, const void *buf);
106
107int main(int argc, char **argv)
108{
109 printf(NAME ": GXemul disk driver\n");
110
111 if (gxe_bd_init() != EOK)
112 return -1;
113
114 printf(NAME ": Accepting connections\n");
115 task_retval(0);
116 async_manager();
117
118 /* Not reached */
119 return 0;
120}
121
122static int gxe_bd_init(void)
123{
124 async_set_client_connection(gxe_bd_connection);
125 int rc = loc_server_register(NAME);
126 if (rc != EOK) {
127 printf("%s: Unable to register driver.\n", NAME);
128 return rc;
129 }
130
131 void *vaddr;
132 rc = pio_enable((void *) dev_physical, sizeof(gxe_bd_t), &vaddr);
133 if (rc != EOK) {
134 printf("%s: Could not initialize device I/O space.\n", NAME);
135 return rc;
136 }
137
138 dev = vaddr;
139
140 for (unsigned int i = 0; i < MAX_DISKS; i++) {
141 char name[16];
142
143 snprintf(name, 16, "%s/disk%u", NAMESPACE, i);
144 rc = loc_service_register(name, &service_id[i]);
145 if (rc != EOK) {
146 printf("%s: Unable to register device %s.\n", NAME,
147 name);
148 return rc;
149 }
150
151 fibril_mutex_initialize(&dev_lock[i]);
152 }
153
154 return EOK;
155}
156
157static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
158{
159 void *fs_va = NULL;
160 ipc_callid_t callid;
161 ipc_call_t call;
162 sysarg_t method;
163 service_id_t dsid;
164 unsigned int flags;
165 int retval;
166 uint64_t ba;
167 unsigned cnt;
168 int disk_id, i;
169
170 /* Get the device handle. */
171 dsid = IPC_GET_ARG1(*icall);
172
173 /* Determine which disk device is the client connecting to. */
174 disk_id = -1;
175 for (i = 0; i < MAX_DISKS; i++)
176 if (service_id[i] == dsid)
177 disk_id = i;
178
179 if (disk_id < 0) {
180 async_answer_0(iid, EINVAL);
181 return;
182 }
183
184 /* Answer the IPC_M_CONNECT_ME_TO call. */
185 async_answer_0(iid, EOK);
186
187 if (!async_share_out_receive(&callid, &comm_size, &flags)) {
188 async_answer_0(callid, EHANGUP);
189 return;
190 }
191
192 if (comm_size < block_size) {
193 async_answer_0(callid, EHANGUP);
194 return;
195 }
196
197 (void) async_share_out_finalize(callid, &fs_va);
198 if (fs_va == (void *) -1) {
199 async_answer_0(callid, EHANGUP);
200 return;
201 }
202
203 while (true) {
204 callid = async_get_call(&call);
205 method = IPC_GET_IMETHOD(call);
206
207 if (!method) {
208 /* The other side has hung up. */
209 async_answer_0(callid, EOK);
210 return;
211 }
212
213 switch (method) {
214 case BD_READ_BLOCKS:
215 ba = MERGE_LOUP32(IPC_GET_ARG1(call),
216 IPC_GET_ARG2(call));
217 cnt = IPC_GET_ARG3(call);
218 if (cnt * block_size > comm_size) {
219 retval = ELIMIT;
220 break;
221 }
222 retval = gxe_bd_read_blocks(disk_id, ba, cnt, fs_va);
223 break;
224 case BD_WRITE_BLOCKS:
225 ba = MERGE_LOUP32(IPC_GET_ARG1(call),
226 IPC_GET_ARG2(call));
227 cnt = IPC_GET_ARG3(call);
228 if (cnt * block_size > comm_size) {
229 retval = ELIMIT;
230 break;
231 }
232 retval = gxe_bd_write_blocks(disk_id, ba, cnt, fs_va);
233 break;
234 case BD_GET_BLOCK_SIZE:
235 async_answer_1(callid, EOK, block_size);
236 continue;
237 case BD_GET_NUM_BLOCKS:
238 retval = ENOTSUP;
239 break;
240 default:
241 retval = EINVAL;
242 break;
243 }
244 async_answer_0(callid, retval);
245 }
246}
247
248/** Read multiple blocks from the device. */
249static int gxe_bd_read_blocks(int disk_id, uint64_t ba, unsigned cnt,
250 void *buf) {
251
252 int rc;
253
254 while (cnt > 0) {
255 rc = gxe_bd_read_block(disk_id, ba, buf);
256 if (rc != EOK)
257 return rc;
258
259 ++ba;
260 --cnt;
261 buf += block_size;
262 }
263
264 return EOK;
265}
266
267/** Write multiple blocks to the device. */
268static int gxe_bd_write_blocks(int disk_id, uint64_t ba, unsigned cnt,
269 const void *buf) {
270
271 int rc;
272
273 while (cnt > 0) {
274 rc = gxe_bd_write_block(disk_id, ba, buf);
275 if (rc != EOK)
276 return rc;
277
278 ++ba;
279 --cnt;
280 buf += block_size;
281 }
282
283 return EOK;
284}
285
286/** Read a block from the device. */
287static int gxe_bd_read_block(int disk_id, uint64_t ba, void *buf)
288{
289 uint32_t status;
290 uint64_t byte_addr;
291 size_t i;
292 uint32_t w;
293
294 byte_addr = ba * block_size;
295
296 fibril_mutex_lock(&dev_lock[disk_id]);
297 pio_write_32(&dev->offset_lo, (uint32_t) byte_addr);
298 pio_write_32(&dev->offset_hi, byte_addr >> 32);
299 pio_write_32(&dev->disk_id, disk_id);
300 pio_write_32(&dev->control, CTL_READ_START);
301
302 status = pio_read_32(&dev->status);
303 if (status == STATUS_FAILURE) {
304 fibril_mutex_unlock(&dev_lock[disk_id]);
305 return EIO;
306 }
307
308 for (i = 0; i < block_size; i++) {
309 ((uint8_t *) buf)[i] = w = pio_read_8(&dev->buffer[i]);
310 }
311
312 fibril_mutex_unlock(&dev_lock[disk_id]);
313 return EOK;
314}
315
316/** Write a block to the device. */
317static int gxe_bd_write_block(int disk_id, uint64_t ba, const void *buf)
318{
319 uint32_t status;
320 uint64_t byte_addr;
321 size_t i;
322
323 byte_addr = ba * block_size;
324
325 fibril_mutex_lock(&dev_lock[disk_id]);
326
327 for (i = 0; i < block_size; i++) {
328 pio_write_8(&dev->buffer[i], ((const uint8_t *) buf)[i]);
329 }
330
331 pio_write_32(&dev->offset_lo, (uint32_t) byte_addr);
332 pio_write_32(&dev->offset_hi, byte_addr >> 32);
333 pio_write_32(&dev->disk_id, disk_id);
334 pio_write_32(&dev->control, CTL_WRITE_START);
335
336 status = pio_read_32(&dev->status);
337 if (status == STATUS_FAILURE) {
338 fibril_mutex_unlock(&dev_lock[disk_id]);
339 return EIO;
340 }
341
342 fibril_mutex_unlock(&dev_lock[disk_id]);
343 return EOK;
344}
345
346/**
347 * @}
348 */
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