[ac7d5ef0] | 1 | /* |
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| 2 | * Dual Port Memory Manager |
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| 3 | * |
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[03f2154e] | 4 | * COPYRIGHT (c) 1989-1997. |
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[ac7d5ef0] | 5 | * On-Line Applications Research Corporation (OAR). |
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[03f2154e] | 6 | * Copyright assigned to U.S. Government, 1994. |
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[ac7d5ef0] | 7 | * |
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[98e4ebf5] | 8 | * The license and distribution terms for this file may be |
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| 9 | * found in the file LICENSE in this distribution or at |
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[03f2154e] | 10 | * http://www.OARcorp.com/rtems/license.html. |
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[ac7d5ef0] | 11 | * |
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| 12 | * $Id$ |
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| 13 | */ |
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| 14 | |
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| 15 | #include <rtems/system.h> |
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[3a4ae6c] | 16 | #include <rtems/rtems/status.h> |
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| 17 | #include <rtems/rtems/support.h> |
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[5e9b32b] | 18 | #include <rtems/score/address.h> |
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[3a4ae6c] | 19 | #include <rtems/rtems/dpmem.h> |
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[5e9b32b] | 20 | #include <rtems/score/object.h> |
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| 21 | #include <rtems/score/thread.h> |
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[3a4ae6c] | 22 | #include <rtems/rtems/dpmem.h> |
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[ac7d5ef0] | 23 | |
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| 24 | /*PAGE |
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| 25 | * |
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| 26 | * _Dual_ported_memory_Manager_initialization |
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| 27 | * |
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| 28 | * This routine initializes all dual-ported memory manager related |
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| 29 | * data structures. |
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| 30 | * |
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| 31 | * Input parameters: |
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| 32 | * maximum_ports - number of ports to initialize |
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| 33 | * |
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| 34 | * Output parameters: NONE |
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| 35 | */ |
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| 36 | |
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| 37 | void _Dual_ported_memory_Manager_initialization( |
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| 38 | unsigned32 maximum_ports |
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| 39 | ) |
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| 40 | { |
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| 41 | _Objects_Initialize_information( |
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[3235ad9] | 42 | &_Dual_ported_memory_Information, |
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| 43 | OBJECTS_RTEMS_PORTS, |
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| 44 | FALSE, |
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| 45 | maximum_ports, |
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| 46 | sizeof( Dual_ported_memory_Control ), |
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| 47 | FALSE, |
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[5250ff39] | 48 | RTEMS_MAXIMUM_NAME_LENGTH, |
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| 49 | FALSE |
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[ac7d5ef0] | 50 | ); |
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| 51 | } |
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| 52 | |
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| 53 | /*PAGE |
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| 54 | * |
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| 55 | * rtems_port_create |
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| 56 | * |
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| 57 | * This directive creates a port into a dual-ported memory area. |
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| 58 | * |
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| 59 | * Input parameters: |
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| 60 | * name - user defined port name |
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| 61 | * internal_start - internal start address of port |
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| 62 | * external_start - external start address of port |
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| 63 | * length - physical length in bytes |
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| 64 | * id - address of port id to set |
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| 65 | * |
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| 66 | * Output parameters: |
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| 67 | * id - port id |
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| 68 | * RTEMS_SUCCESSFUL - if successful |
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| 69 | * error code - if unsuccessful |
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| 70 | */ |
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| 71 | |
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| 72 | rtems_status_code rtems_port_create( |
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[3235ad9] | 73 | rtems_name name, |
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[ac7d5ef0] | 74 | void *internal_start, |
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| 75 | void *external_start, |
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| 76 | unsigned32 length, |
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| 77 | Objects_Id *id |
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| 78 | ) |
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| 79 | { |
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| 80 | register Dual_ported_memory_Control *the_port; |
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| 81 | |
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[3235ad9] | 82 | if ( !rtems_is_name_valid( name) ) |
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[3a4ae6c] | 83 | return RTEMS_INVALID_NAME; |
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[ac7d5ef0] | 84 | |
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| 85 | if ( !_Addresses_Is_aligned( internal_start ) || |
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| 86 | !_Addresses_Is_aligned( external_start ) ) |
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[3a4ae6c] | 87 | return RTEMS_INVALID_ADDRESS; |
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[ac7d5ef0] | 88 | |
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| 89 | _Thread_Disable_dispatch(); /* to prevent deletion */ |
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| 90 | |
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| 91 | the_port = _Dual_ported_memory_Allocate(); |
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| 92 | |
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| 93 | if ( !the_port ) { |
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| 94 | _Thread_Enable_dispatch(); |
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[3a4ae6c] | 95 | return RTEMS_TOO_MANY; |
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[ac7d5ef0] | 96 | } |
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| 97 | |
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| 98 | the_port->internal_base = internal_start; |
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| 99 | the_port->external_base = external_start; |
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| 100 | the_port->length = length - 1; |
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| 101 | |
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[3235ad9] | 102 | _Objects_Open( |
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| 103 | &_Dual_ported_memory_Information, |
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| 104 | &the_port->Object, |
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| 105 | &name |
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| 106 | ); |
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| 107 | |
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[ac7d5ef0] | 108 | *id = the_port->Object.id; |
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| 109 | _Thread_Enable_dispatch(); |
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[3a4ae6c] | 110 | return RTEMS_SUCCESSFUL; |
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[ac7d5ef0] | 111 | } |
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| 112 | |
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| 113 | /*PAGE |
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| 114 | * |
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| 115 | * rtems_port_ident |
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| 116 | * |
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| 117 | * This directive returns the system ID associated with |
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| 118 | * the port name. |
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| 119 | * |
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| 120 | * Input parameters: |
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| 121 | * name - user defined port name |
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| 122 | * id - pointer to port id |
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| 123 | * |
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| 124 | * Output parameters: |
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| 125 | * *id - port id |
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| 126 | * RTEMS_SUCCESSFUL - if successful |
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| 127 | * error code - if unsuccessful |
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| 128 | */ |
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| 129 | |
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| 130 | rtems_status_code rtems_port_ident( |
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[3235ad9] | 131 | rtems_name name, |
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[ac7d5ef0] | 132 | Objects_Id *id |
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| 133 | ) |
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| 134 | { |
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[3a4ae6c] | 135 | Objects_Name_to_id_errors status; |
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| 136 | |
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| 137 | status = _Objects_Name_to_id( |
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| 138 | &_Dual_ported_memory_Information, |
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| 139 | &name, |
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| 140 | OBJECTS_SEARCH_ALL_NODES, |
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| 141 | id |
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[ac7d5ef0] | 142 | ); |
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[3a4ae6c] | 143 | |
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| 144 | return _Status_Object_name_errors_to_status[ status ]; |
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[ac7d5ef0] | 145 | } |
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| 146 | |
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| 147 | /*PAGE |
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| 148 | * |
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| 149 | * rtems_port_delete |
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| 150 | * |
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| 151 | * This directive allows a thread to delete a dual-ported memory area |
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| 152 | * specified by the dual-ported memory identifier. |
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| 153 | * |
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| 154 | * Input parameters: |
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| 155 | * id - dual-ported memory area id |
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| 156 | * |
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| 157 | * Output parameters: |
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| 158 | * RTEMS_SUCCESSFUL - if successful |
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| 159 | * error code - if unsuccessful |
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| 160 | */ |
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| 161 | |
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| 162 | rtems_status_code rtems_port_delete( |
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| 163 | Objects_Id id |
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| 164 | ) |
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| 165 | { |
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| 166 | register Dual_ported_memory_Control *the_port; |
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| 167 | Objects_Locations location; |
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| 168 | |
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| 169 | the_port = _Dual_ported_memory_Get( id, &location ); |
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| 170 | switch ( location ) { |
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| 171 | case OBJECTS_ERROR: |
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[3a4ae6c] | 172 | return RTEMS_INVALID_ID; |
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[ac7d5ef0] | 173 | case OBJECTS_REMOTE: /* this error cannot be returned */ |
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[3a4ae6c] | 174 | return RTEMS_INTERNAL_ERROR; |
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[ac7d5ef0] | 175 | case OBJECTS_LOCAL: |
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| 176 | _Objects_Close( &_Dual_ported_memory_Information, &the_port->Object ); |
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| 177 | _Dual_ported_memory_Free( the_port ); |
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| 178 | _Thread_Enable_dispatch(); |
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[3a4ae6c] | 179 | return RTEMS_SUCCESSFUL; |
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[ac7d5ef0] | 180 | } |
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| 181 | |
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[3a4ae6c] | 182 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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[ac7d5ef0] | 183 | } |
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| 184 | |
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| 185 | /*PAGE |
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| 186 | * |
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| 187 | * rtems_port_internal_to_external |
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| 188 | * |
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| 189 | * This directive converts an internal dual-ported memory address to an |
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| 190 | * external dual-ported memory address. If the given internal address |
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| 191 | * is an invalid dual-ported address, then the external address is set |
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| 192 | * to the given internal address. |
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| 193 | * |
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| 194 | * Input parameters: |
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| 195 | * id - id of dual-ported memory object |
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| 196 | * internal - internal address to set |
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| 197 | * external - pointer to external address |
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| 198 | * |
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| 199 | * Output parameters: |
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| 200 | * external - external address |
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| 201 | * RTEMS_SUCCESSFUL - always succeeds |
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| 202 | */ |
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| 203 | |
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| 204 | rtems_status_code rtems_port_internal_to_external( |
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| 205 | Objects_Id id, |
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| 206 | void *internal, |
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| 207 | void **external |
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| 208 | ) |
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| 209 | { |
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| 210 | register Dual_ported_memory_Control *the_port; |
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| 211 | Objects_Locations location; |
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| 212 | unsigned32 ending; |
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| 213 | |
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| 214 | the_port = _Dual_ported_memory_Get( id, &location ); |
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| 215 | switch ( location ) { |
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| 216 | case OBJECTS_ERROR: |
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[3a4ae6c] | 217 | return RTEMS_INVALID_ID; |
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[ac7d5ef0] | 218 | case OBJECTS_REMOTE: /* this error cannot be returned */ |
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[3a4ae6c] | 219 | return RTEMS_INTERNAL_ERROR; |
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[ac7d5ef0] | 220 | case OBJECTS_LOCAL: |
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| 221 | ending = _Addresses_Subtract( internal, the_port->internal_base ); |
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| 222 | if ( ending > the_port->length ) |
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| 223 | *external = internal; |
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| 224 | else |
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| 225 | *external = _Addresses_Add_offset( the_port->external_base, |
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| 226 | ending ); |
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| 227 | _Thread_Enable_dispatch(); |
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[3a4ae6c] | 228 | return RTEMS_SUCCESSFUL; |
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[ac7d5ef0] | 229 | } |
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| 230 | |
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[3a4ae6c] | 231 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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[ac7d5ef0] | 232 | } |
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| 233 | |
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| 234 | /*PAGE |
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| 235 | * |
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| 236 | * rtems_port_external_to_internal |
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| 237 | * |
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| 238 | * This directive converts an external dual-ported memory address to an |
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| 239 | * internal dual-ported memory address. If the given external address |
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| 240 | * is an invalid dual-ported address, then the internal address is set |
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| 241 | * to the given external address. |
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| 242 | * |
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| 243 | * Input parameters: |
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| 244 | * id - id of dp memory object |
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| 245 | * external - external address |
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| 246 | * internal - pointer of internal address to set |
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| 247 | * |
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| 248 | * Output parameters: |
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| 249 | * internal - internal address |
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| 250 | * RTEMS_SUCCESSFUL - always succeeds |
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| 251 | */ |
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| 252 | |
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| 253 | rtems_status_code rtems_port_external_to_internal( |
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| 254 | Objects_Id id, |
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| 255 | void *external, |
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| 256 | void **internal |
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| 257 | ) |
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| 258 | { |
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| 259 | register Dual_ported_memory_Control *the_port; |
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| 260 | Objects_Locations location; |
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| 261 | unsigned32 ending; |
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| 262 | |
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| 263 | the_port = _Dual_ported_memory_Get( id, &location ); |
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| 264 | switch ( location ) { |
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| 265 | case OBJECTS_ERROR: |
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[3a4ae6c] | 266 | return RTEMS_INVALID_ID; |
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[ac7d5ef0] | 267 | case OBJECTS_REMOTE: /* this error cannot be returned */ |
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[3a4ae6c] | 268 | return RTEMS_INTERNAL_ERROR; |
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[ac7d5ef0] | 269 | case OBJECTS_LOCAL: |
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| 270 | ending = _Addresses_Subtract( external, the_port->external_base ); |
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| 271 | if ( ending > the_port->length ) |
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| 272 | *internal = external; |
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| 273 | else |
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| 274 | *internal = _Addresses_Add_offset( the_port->internal_base, |
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| 275 | ending ); |
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| 276 | _Thread_Enable_dispatch(); |
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[3a4ae6c] | 277 | return RTEMS_SUCCESSFUL; |
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[ac7d5ef0] | 278 | } |
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| 279 | |
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[3a4ae6c] | 280 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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[ac7d5ef0] | 281 | } |
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