1 | /* |
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2 | * Input/Output Manager - Initialize Device Driver Subsystem |
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3 | * |
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4 | * COPYRIGHT (c) 1989-2008. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | */ |
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11 | |
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12 | #if HAVE_CONFIG_H |
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13 | #include "config.h" |
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14 | #endif |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/config.h> |
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18 | #include <rtems/io.h> |
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19 | #include <rtems/score/isr.h> |
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20 | #include <rtems/score/thread.h> |
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21 | #include <rtems/score/wkspace.h> |
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22 | |
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23 | #include <string.h> |
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24 | |
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25 | /* |
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26 | * _IO_Manager_initialization |
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27 | * |
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28 | * The IO manager has been extended to support runtime driver |
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29 | * registration. The driver table is now allocated in the |
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30 | * workspace. |
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31 | * |
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32 | */ |
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33 | |
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34 | void _IO_Manager_initialization(void) |
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35 | { |
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36 | uint32_t index; |
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37 | rtems_driver_address_table *driver_table; |
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38 | uint32_t drivers_in_table; |
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39 | uint32_t number_of_drivers; |
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40 | |
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41 | driver_table = Configuration.Device_driver_table; |
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42 | drivers_in_table = Configuration.number_of_device_drivers; |
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43 | number_of_drivers = rtems_configuration_get_maximum_drivers(); |
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44 | |
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45 | /* |
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46 | * If the user claims there are less drivers than are actually in |
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47 | * the table, then let's just go with the table's count. |
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48 | */ |
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49 | if ( number_of_drivers <= drivers_in_table ) |
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50 | number_of_drivers = drivers_in_table; |
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51 | |
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52 | /* |
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53 | * If the maximum number of driver is the same as the number in the |
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54 | * table, then we do not have to copy the driver table. They can't |
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55 | * register any dynamically. |
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56 | */ |
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57 | if ( number_of_drivers == drivers_in_table ) { |
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58 | _IO_Driver_address_table = driver_table; |
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59 | _IO_Number_of_drivers = number_of_drivers; |
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60 | return; |
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61 | } |
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62 | |
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63 | /* |
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64 | * The application requested extra slots in the driver table, so we |
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65 | * have to allocate a new driver table and copy theirs to it. |
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66 | */ |
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67 | |
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68 | _IO_Driver_address_table = (rtems_driver_address_table *) |
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69 | _Workspace_Allocate_or_fatal_error( |
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70 | sizeof( rtems_driver_address_table ) * ( number_of_drivers ) |
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71 | ); |
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72 | _IO_Number_of_drivers = number_of_drivers; |
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73 | |
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74 | memset( |
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75 | _IO_Driver_address_table, 0, |
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76 | sizeof( rtems_driver_address_table ) * ( number_of_drivers ) |
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77 | ); |
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78 | |
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79 | for ( index = 0 ; index < drivers_in_table ; index++ ) |
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80 | _IO_Driver_address_table[index] = driver_table[index]; |
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81 | } |
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82 | |
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83 | /* |
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84 | * _IO_Initialize_all_drivers |
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85 | * |
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86 | * This routine initializes all device drivers |
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87 | * |
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88 | * Input Paramters: NONE |
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89 | * |
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90 | * Output Parameters: NONE |
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91 | */ |
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92 | |
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93 | void _IO_Initialize_all_drivers( void ) |
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94 | { |
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95 | rtems_device_major_number major; |
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96 | |
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97 | for ( major=0 ; major < _IO_Number_of_drivers ; major ++ ) |
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98 | (void) rtems_io_initialize( major, 0, NULL ); |
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99 | } |
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