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4411 svoboda 1
/*
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 * Copyright (c) 2009 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup bd
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 * @{
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 */
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/**
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 * @file
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 * @brief GXemul disk driver
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 */
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38
#include <stdio.h>
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#include <libarch/ddi.h>
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#include <ddi.h>
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#include <ipc/ipc.h>
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#include <ipc/bd.h>
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#include <async.h>
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#include <as.h>
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#include <futex.h>
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#include <devmap.h>
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#include <sys/types.h>
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#include <errno.h>
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#define NAME "gxe_bd"
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enum {
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    CTL_READ_START  = 0,
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    CTL_WRITE_START = 1,
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};
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57
enum {
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    STATUS_FAILURE  = 0
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};
60
 
4442 svoboda 61
enum {
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    MAX_DISKS   = 2
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};
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4411 svoboda 65
typedef struct {
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    uint32_t offset_lo;
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    uint32_t pad0;
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    uint32_t offset_hi;
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    uint32_t pad1;
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71
    uint32_t disk_id;
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    uint32_t pad2[3];
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74
    uint32_t control;
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    uint32_t pad3[3];
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77
    uint32_t status;
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79
    uint32_t pad4[3];
4440 jermar 80
    uint8_t pad5[0x3fc0];
4411 svoboda 81
 
4440 jermar 82
    uint8_t buffer[512];
4411 svoboda 83
} gxe_bd_t;
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85
 
4428 svoboda 86
static const size_t block_size = 512;
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static size_t comm_size;
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4411 svoboda 89
static uintptr_t dev_physical = 0x13000000;
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static gxe_bd_t *dev;
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4442 svoboda 92
static dev_handle_t dev_handle[MAX_DISKS];
4411 svoboda 93
 
94
static atomic_t dev_futex = FUTEX_INITIALIZER;
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96
static int gxe_bd_init(void);
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static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall);
4442 svoboda 98
static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, off_t size,
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    void *buf);
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static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,
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    void *buf);
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static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,
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    const void *buf);
4411 svoboda 104
 
105
int main(int argc, char **argv)
106
{
107
    printf(NAME ": GXemul disk driver\n");
108
 
109
    if (gxe_bd_init() != EOK)
110
        return -1;
111
 
112
    printf(NAME ": Accepting connections\n");
113
    async_manager();
114
 
115
    /* Not reached */
116
    return 0;
117
}
118
 
119
static int gxe_bd_init(void)
120
{
121
    void *vaddr;
4442 svoboda 122
    int rc, i;
123
    char name[16];
4411 svoboda 124
 
125
    rc = devmap_driver_register(NAME, gxe_bd_connection);
126
    if (rc < 0) {
127
        printf(NAME ": Unable to register driver.\n");
128
        return rc;
129
    }
130
 
131
    rc = pio_enable((void *) dev_physical, sizeof(gxe_bd_t), &vaddr);
132
    if (rc != EOK) {
133
        printf(NAME ": Could not initialize device I/O space.\n");
134
        return rc;
135
    }
136
 
137
    dev = vaddr;
138
 
4442 svoboda 139
    for (i = 0; i < MAX_DISKS; i++) {
140
        snprintf(name, 16, "disk%d", i);
141
        rc = devmap_device_register(name, &dev_handle[i]);
142
        if (rc != EOK) {
143
            devmap_hangup_phone(DEVMAP_DRIVER);
144
            printf(NAME ": Unable to register device %s.\n",
145
                name);
146
            return rc;
147
        }
4411 svoboda 148
    }
149
 
150
    return EOK;
151
}
152
 
153
static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall)
154
{
155
    void *fs_va = NULL;
156
    ipc_callid_t callid;
157
    ipc_call_t call;
4428 svoboda 158
    ipcarg_t method;
4442 svoboda 159
    dev_handle_t dh;
4411 svoboda 160
    int flags;
161
    int retval;
4428 svoboda 162
    off_t idx;
163
    off_t size;
4442 svoboda 164
    int disk_id, i;
4411 svoboda 165
 
4442 svoboda 166
    /* Get the device handle. */
167
    dh = IPC_GET_ARG1(*icall);
168
 
169
    /* Determine which disk device is the client connecting to. */
170
    disk_id = -1;
171
    for (i = 0; i < MAX_DISKS; i++)
172
        if (dev_handle[i] == dh)
173
            disk_id = i;
174
 
175
    if (disk_id < 0) {
176
        ipc_answer_0(iid, EINVAL);
177
        return;
178
    }
179
 
4411 svoboda 180
    /* Answer the IPC_M_CONNECT_ME_TO call. */
181
    ipc_answer_0(iid, EOK);
182
 
4428 svoboda 183
    if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {
4411 svoboda 184
        ipc_answer_0(callid, EHANGUP);
185
        return;
186
    }
187
 
4428 svoboda 188
    fs_va = as_get_mappable_page(comm_size);
4411 svoboda 189
    if (fs_va == NULL) {
190
        ipc_answer_0(callid, EHANGUP);
191
        return;
192
    }
193
 
194
    (void) ipc_share_out_finalize(callid, fs_va);
195
 
196
    while (1) {
197
        callid = async_get_call(&call);
4428 svoboda 198
        method = IPC_GET_METHOD(call);
199
        switch (method) {
4411 svoboda 200
        case IPC_M_PHONE_HUNGUP:
201
            /* The other side has hung up. */
202
            ipc_answer_0(callid, EOK);
203
            return;
204
        case BD_READ_BLOCK:
205
        case BD_WRITE_BLOCK:
4428 svoboda 206
            idx = IPC_GET_ARG1(call);
207
            size = IPC_GET_ARG2(call);
208
            if (size > comm_size) {
209
                retval = EINVAL;
210
                break;
211
            }
4442 svoboda 212
            retval = gx_bd_rdwr(disk_id, method, idx * size,
213
                size, fs_va);
4411 svoboda 214
            break;
215
        default:
216
            retval = EINVAL;
217
            break;
218
        }
219
        ipc_answer_0(callid, retval);
220
    }
221
}
222
 
4442 svoboda 223
static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, off_t size,
224
    void *buf)
4411 svoboda 225
{
4428 svoboda 226
    int rc;
227
    size_t now;
228
 
229
    while (size > 0) {
230
        now = size < block_size ? size : block_size;
231
 
232
        if (method == BD_READ_BLOCK)
4442 svoboda 233
            rc = gxe_bd_read_block(disk_id, offset, now, buf);
4428 svoboda 234
        else
4442 svoboda 235
            rc = gxe_bd_write_block(disk_id, offset, now, buf);
4428 svoboda 236
 
237
        if (rc != EOK)
238
            return rc;
239
 
240
        buf += block_size;
241
        offset += block_size;
242
 
243
        if (size > block_size)
244
            size -= block_size;
245
        else
246
            size = 0;
247
    }
248
 
249
    return EOK;
250
}
251
 
4442 svoboda 252
static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,
253
    void *buf)
4428 svoboda 254
{
4411 svoboda 255
    uint32_t status;
256
    size_t i;
257
    uint32_t w;
258
 
259
    futex_down(&dev_futex);
260
    pio_write_32(&dev->offset_lo, (uint32_t) offset);
261
    pio_write_32(&dev->offset_hi, offset >> 32);
262
    pio_write_32(&dev->disk_id, disk_id);
263
    pio_write_32(&dev->control, CTL_READ_START);
264
 
265
    status = pio_read_32(&dev->status);
266
    if (status == STATUS_FAILURE) {
267
        return EIO;
268
    }
269
 
4428 svoboda 270
    for (i = 0; i < size; i++) {
4440 jermar 271
        ((uint8_t *) buf)[i] = w = pio_read_8(&dev->buffer[i]);
4411 svoboda 272
    }
273
 
274
    futex_up(&dev_futex);
275
    return EOK;
276
}
277
 
4442 svoboda 278
static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,
279
    const void *buf)
4411 svoboda 280
{
281
    uint32_t status;
282
    size_t i;
283
 
4428 svoboda 284
    for (i = 0; i < size; i++) {
4440 jermar 285
        pio_write_8(&dev->buffer[i], ((const uint8_t *) buf)[i]);
4411 svoboda 286
    }
287
 
288
    futex_down(&dev_futex);
289
    pio_write_32(&dev->offset_lo, (uint32_t) offset);
290
    pio_write_32(&dev->offset_hi, offset >> 32);
291
    pio_write_32(&dev->disk_id, disk_id);
292
    pio_write_32(&dev->control, CTL_WRITE_START);
293
 
294
    status = pio_read_32(&dev->status);
295
    if (status == STATUS_FAILURE) {
296
        return EIO;
297
    }
298
 
299
    futex_up(&dev_futex);
300
    return EOK;
301
}
302
 
303
/**
304
 * @}
305
 */