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  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/ipc.h>
  42. #include <ipc/bd.h>
  43. #include <async.h>
  44. #include <as.h>
  45. #include <futex.h>
  46. #include <devmap.h>
  47. #include <sys/types.h>
  48. #include <errno.h>
  49.  
  50. #define NAME "gxe_bd"
  51.  
  52. enum {
  53.     CTL_READ_START  = 0,
  54.     CTL_WRITE_START = 1,
  55. };
  56.  
  57. enum {
  58.     STATUS_FAILURE  = 0
  59. };
  60.  
  61. enum {
  62.     MAX_DISKS   = 2
  63. };
  64.  
  65. typedef struct {
  66.     uint32_t offset_lo;
  67.     uint32_t pad0;
  68.     uint32_t offset_hi;
  69.     uint32_t pad1;
  70.  
  71.     uint32_t disk_id;
  72.     uint32_t pad2[3];
  73.  
  74.     uint32_t control;
  75.     uint32_t pad3[3];
  76.  
  77.     uint32_t status;
  78.  
  79.     uint32_t pad4[3];
  80.     uint8_t pad5[0x3fc0];
  81.  
  82.     uint8_t buffer[512];
  83. } gxe_bd_t;
  84.  
  85.  
  86. static const size_t block_size = 512;
  87. static size_t comm_size;
  88.  
  89. static uintptr_t dev_physical = 0x13000000;
  90. static gxe_bd_t *dev;
  91.  
  92. static dev_handle_t dev_handle[MAX_DISKS];
  93.  
  94. static atomic_t dev_futex = FUTEX_INITIALIZER;
  95.  
  96. static int gxe_bd_init(void);
  97. static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall);
  98. static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, off_t size,
  99.     void *buf);
  100. static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,
  101.     void *buf);
  102. static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,
  103.     const void *buf);
  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;
  122.     int rc, i;
  123.     char name[16];
  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.  
  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.         }
  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;
  158.     ipcarg_t method;
  159.     dev_handle_t dh;
  160.     int flags;
  161.     int retval;
  162.     off_t idx;
  163.     off_t size;
  164.     int disk_id, i;
  165.  
  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.  
  180.     /* Answer the IPC_M_CONNECT_ME_TO call. */
  181.     ipc_answer_0(iid, EOK);
  182.  
  183.     if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {
  184.         ipc_answer_0(callid, EHANGUP);
  185.         return;
  186.     }
  187.  
  188.     fs_va = as_get_mappable_page(comm_size);
  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);
  198.         method = IPC_GET_METHOD(call);
  199.         switch (method) {
  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:
  206.             idx = IPC_GET_ARG1(call);
  207.             size = IPC_GET_ARG2(call);
  208.             if (size > comm_size) {
  209.                 retval = EINVAL;
  210.                 break;
  211.             }
  212.             retval = gx_bd_rdwr(disk_id, method, idx * size,
  213.                 size, fs_va);
  214.             break;
  215.         default:
  216.             retval = EINVAL;
  217.             break;
  218.         }
  219.         ipc_answer_0(callid, retval);
  220.     }
  221. }
  222.  
  223. static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, off_t size,
  224.     void *buf)
  225. {
  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)
  233.             rc = gxe_bd_read_block(disk_id, offset, now, buf);
  234.         else
  235.             rc = gxe_bd_write_block(disk_id, offset, now, buf);
  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.  
  252. static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,
  253.     void *buf)
  254. {
  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.  
  270.     for (i = 0; i < size; i++) {
  271.         ((uint8_t *) buf)[i] = w = pio_read_8(&dev->buffer[i]);
  272.     }
  273.  
  274.     futex_up(&dev_futex);
  275.     return EOK;
  276. }
  277.  
  278. static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,
  279.     const void *buf)
  280. {
  281.     uint32_t status;
  282.     size_t i;
  283.  
  284.     for (i = 0; i < size; i++) {
  285.         pio_write_8(&dev->buffer[i], ((const uint8_t *) buf)[i]);
  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.  */
  306.