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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. typedef struct {
  62.     uint32_t offset_lo;
  63.     uint32_t pad0;
  64.     uint32_t offset_hi;
  65.     uint32_t pad1;
  66.  
  67.     uint32_t disk_id;
  68.     uint32_t pad2[3];
  69.  
  70.     uint32_t control;
  71.     uint32_t pad3[3];
  72.  
  73.     uint32_t status;
  74.  
  75. /*  FIXME: Need to fix pio_enable() to support >= page_size areas.
  76.  
  77.     uint32_t pad4[3];
  78.     uint32_t pad5[0x3fc0];
  79.  
  80.     uint8_t buffer[512];*/
  81. } gxe_bd_t;
  82.  
  83. typedef struct {
  84.     uint8_t buffer[512];
  85. } gxe_buf_t;
  86.  
  87. static const size_t block_size = 512;
  88. static size_t comm_size;
  89.  
  90. static uintptr_t dev_physical = 0x13000000;
  91. static gxe_bd_t *dev;
  92. static gxe_buf_t *devbuf;
  93.  
  94. static uint32_t disk_id = 0;
  95.  
  96. static atomic_t dev_futex = FUTEX_INITIALIZER;
  97.  
  98. static int gxe_bd_init(void);
  99. static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall);
  100. static int gx_bd_rdwr(ipcarg_t method, off_t offset, off_t size, void *buf);
  101. static int gxe_bd_read_block(uint64_t offset, size_t size, void *buf);
  102. static int gxe_bd_write_block(uint64_t offset, size_t size, const void *buf);
  103.  
  104. int main(int argc, char **argv)
  105. {
  106.     printf(NAME ": GXemul disk driver\n");
  107.  
  108.     if (gxe_bd_init() != EOK)
  109.         return -1;
  110.  
  111.     printf(NAME ": Accepting connections\n");
  112.     async_manager();
  113.  
  114.     /* Not reached */
  115.     return 0;
  116. }
  117.  
  118. static int gxe_bd_init(void)
  119. {
  120.     dev_handle_t dev_handle;
  121.     void *vaddr;
  122.     int rc;
  123.  
  124.     rc = devmap_driver_register(NAME, gxe_bd_connection);
  125.     if (rc < 0) {
  126.         printf(NAME ": Unable to register driver.\n");
  127.         return rc;
  128.     }
  129.  
  130.     rc = pio_enable((void *) dev_physical, sizeof(gxe_bd_t), &vaddr);
  131.     if (rc != EOK) {
  132.         printf(NAME ": Could not initialize device I/O space.\n");
  133.         return rc;
  134.     }
  135.  
  136.     dev = vaddr;
  137.  
  138.     rc = pio_enable((void *) dev_physical + 0x4000, sizeof(gxe_buf_t), &vaddr);
  139.     if (rc != EOK) {
  140.         printf(NAME ": Could not initialize device I/O space.\n");
  141.         return rc;
  142.     }
  143.  
  144.     devbuf = vaddr;
  145.  
  146.     rc = devmap_device_register("disk0", &dev_handle);
  147.     if (rc != EOK) {
  148.         devmap_hangup_phone(DEVMAP_DRIVER);
  149.         printf(NAME ": Unable to register device.\n");
  150.         return rc;
  151.     }
  152.  
  153.     return EOK;
  154. }
  155.  
  156. static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall)
  157. {
  158.     void *fs_va = NULL;
  159.     ipc_callid_t callid;
  160.     ipc_call_t call;
  161.     ipcarg_t method;
  162.     int flags;
  163.     int retval;
  164.     off_t idx;
  165.     off_t size;
  166.  
  167.     /* Answer the IPC_M_CONNECT_ME_TO call. */
  168.     ipc_answer_0(iid, EOK);
  169.  
  170.     if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {
  171.         ipc_answer_0(callid, EHANGUP);
  172.         return;
  173.     }
  174.  
  175.     fs_va = as_get_mappable_page(comm_size);
  176.     if (fs_va == NULL) {
  177.         ipc_answer_0(callid, EHANGUP);
  178.         return;
  179.     }
  180.  
  181.     (void) ipc_share_out_finalize(callid, fs_va);
  182.  
  183.     while (1) {
  184.         callid = async_get_call(&call);
  185.         method = IPC_GET_METHOD(call);
  186.         switch (method) {
  187.         case IPC_M_PHONE_HUNGUP:
  188.             /* The other side has hung up. */
  189.             ipc_answer_0(callid, EOK);
  190.             return;
  191.         case BD_READ_BLOCK:
  192.         case BD_WRITE_BLOCK:
  193.             idx = IPC_GET_ARG1(call);
  194.             size = IPC_GET_ARG2(call);
  195.             if (size > comm_size) {
  196.                 retval = EINVAL;
  197.                 break;
  198.             }
  199.             retval = gx_bd_rdwr(method, idx * size, size, fs_va);
  200.             break;
  201.         default:
  202.             retval = EINVAL;
  203.             break;
  204.         }
  205.         ipc_answer_0(callid, retval);
  206.     }
  207. }
  208.  
  209. static int gx_bd_rdwr(ipcarg_t method, off_t offset, off_t size, void *buf)
  210. {
  211.     int rc;
  212.     size_t now;
  213.  
  214.     while (size > 0) {
  215.         now = size < block_size ? size : block_size;
  216.  
  217.         if (method == BD_READ_BLOCK)
  218.             rc = gxe_bd_read_block(offset, now, buf);
  219.         else
  220.             rc = gxe_bd_write_block(offset, now, buf);
  221.  
  222.         if (rc != EOK)
  223.             return rc;
  224.  
  225.         buf += block_size;
  226.         offset += block_size;
  227.  
  228.         if (size > block_size)
  229.             size -= block_size;
  230.         else
  231.             size = 0;
  232.     }
  233.  
  234.     return EOK;
  235. }
  236.  
  237. static int gxe_bd_read_block(uint64_t offset, size_t size, void *buf)
  238. {
  239.     uint32_t status;
  240.     size_t i;
  241.     uint32_t w;
  242.  
  243.     futex_down(&dev_futex);
  244.     pio_write_32(&dev->offset_lo, (uint32_t) offset);
  245.     pio_write_32(&dev->offset_hi, offset >> 32);
  246.     pio_write_32(&dev->disk_id, disk_id);
  247.     pio_write_32(&dev->control, CTL_READ_START);
  248.  
  249.     status = pio_read_32(&dev->status);
  250.     if (status == STATUS_FAILURE) {
  251.         return EIO;
  252.     }
  253.  
  254.     for (i = 0; i < size; i++) {
  255.         ((uint8_t *) buf)[i] = w =
  256.             pio_read_8(&devbuf->buffer[i]);
  257.     }
  258.  
  259.     futex_up(&dev_futex);
  260.     return EOK;
  261. }
  262.  
  263. static int gxe_bd_write_block(uint64_t offset, size_t size, const void *buf)
  264. {
  265.     uint32_t status;
  266.     size_t i;
  267.     uint32_t w;
  268.  
  269.     for (i = 0; i < size; i++) {
  270.         pio_write_8(&devbuf->buffer[i], ((const uint8_t *) buf)[i]);
  271.     }
  272.  
  273.     futex_down(&dev_futex);
  274.     pio_write_32(&dev->offset_lo, (uint32_t) offset);
  275.     pio_write_32(&dev->offset_hi, offset >> 32);
  276.     pio_write_32(&dev->disk_id, disk_id);
  277.     pio_write_32(&dev->control, CTL_WRITE_START);
  278.  
  279.     status = pio_read_32(&dev->status);
  280.     if (status == STATUS_FAILURE) {
  281.         return EIO;
  282.     }
  283.  
  284.     futex_up(&dev_futex);
  285.     return EOK;
  286. }
  287.  
  288. /**
  289.  * @}
  290.  */
  291.