1 | /* |
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2 | * Dual Port Memory Manager |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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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.OARcorp.com/rtems/license.html. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #include <rtems/system.h> |
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15 | #include <rtems/rtems/status.h> |
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16 | #include <rtems/rtems/support.h> |
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17 | #include <rtems/score/address.h> |
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18 | #include <rtems/rtems/dpmem.h> |
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19 | #include <rtems/score/object.h> |
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20 | #include <rtems/score/thread.h> |
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21 | #include <rtems/rtems/dpmem.h> |
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22 | |
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23 | /*PAGE |
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24 | * |
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25 | * rtems_port_internal_to_external |
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26 | * |
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27 | * This directive converts an internal dual-ported memory address to an |
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28 | * external dual-ported memory address. If the given internal address |
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29 | * is an invalid dual-ported address, then the external address is set |
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30 | * to the given internal address. |
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31 | * |
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32 | * Input parameters: |
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33 | * id - id of dual-ported memory object |
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34 | * internal - internal address to set |
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35 | * external - pointer to external address |
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36 | * |
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37 | * Output parameters: |
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38 | * external - external address |
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39 | * RTEMS_SUCCESSFUL - always succeeds |
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40 | */ |
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41 | |
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42 | rtems_status_code rtems_port_internal_to_external( |
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43 | Objects_Id id, |
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44 | void *internal, |
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45 | void **external |
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46 | ) |
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47 | { |
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48 | register Dual_ported_memory_Control *the_port; |
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49 | Objects_Locations location; |
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50 | unsigned32 ending; |
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51 | |
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52 | the_port = _Dual_ported_memory_Get( id, &location ); |
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53 | switch ( location ) { |
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54 | case OBJECTS_REMOTE: /* this error cannot be returned */ |
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55 | return RTEMS_INTERNAL_ERROR; |
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56 | |
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57 | case OBJECTS_ERROR: |
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58 | return RTEMS_INVALID_ID; |
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59 | |
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60 | case OBJECTS_LOCAL: |
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61 | ending = _Addresses_Subtract( internal, the_port->internal_base ); |
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62 | if ( ending > the_port->length ) |
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63 | *external = internal; |
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64 | else |
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65 | *external = _Addresses_Add_offset( the_port->external_base, |
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66 | ending ); |
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67 | _Thread_Enable_dispatch(); |
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68 | return RTEMS_SUCCESSFUL; |
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69 | } |
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70 | |
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71 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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72 | } |
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