1 | @c |
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2 | @c COPYRIGHT (c) 1988-2002. |
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3 | @c On-Line Applications Research Corporation (OAR). |
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4 | @c All rights reserved. |
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5 | @c |
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6 | @c $Id$ |
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7 | @c |
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8 | |
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9 | @chapter Processor Dependent Information Table |
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10 | |
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11 | @section Introduction |
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12 | |
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13 | Any highly processor dependent information required |
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14 | to describe a processor to RTEMS is provided in the CPU |
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15 | Dependent Information Table. This table is not required for all |
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16 | processors supported by RTEMS. This chapter describes the |
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17 | contents, if any, for a particular processor type. |
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18 | |
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19 | @section CPU Dependent Information Table |
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20 | |
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21 | The i386 version of the RTEMS CPU Dependent |
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22 | Information Table contains the information required to interface |
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23 | a Board Support Package and RTEMS on the i386. This information |
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24 | is provided to allow RTEMS to interoperate effectively with the |
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25 | BSP. The C structure definition is given here: |
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26 | |
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27 | @example |
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28 | @group |
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29 | typedef struct @{ |
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30 | void (*pretasking_hook)( void ); |
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31 | void (*predriver_hook)( void ); |
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32 | void (*idle_task)( void ); |
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33 | boolean do_zero_of_workspace; |
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34 | unsigned32 idle_task_stack_size; |
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35 | unsigned32 interrupt_stack_size; |
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36 | unsigned32 extra_mpci_receive_server_stack; |
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37 | void * (*stack_allocate_hook)( unsigned32 ); |
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38 | void (*stack_free_hook)( void* ); |
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39 | /* end of fields required on all CPUs */ |
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40 | |
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41 | unsigned32 interrupt_segment; |
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42 | void *interrupt_vector_table; |
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43 | @} rtems_cpu_table; |
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44 | @end group |
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45 | @end example |
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46 | |
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47 | @table @code |
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48 | @item pretasking_hook |
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49 | is the address of the user provided routine which is invoked |
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50 | once RTEMS APIs are initialized. This routine will be invoked |
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51 | before any system tasks are created. Interrupts are disabled. |
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52 | This field may be NULL to indicate that the hook is not utilized. |
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53 | |
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54 | @item predriver_hook |
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55 | is the address of the user provided |
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56 | routine that is invoked immediately before the |
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57 | the device drivers and MPCI are initialized. RTEMS |
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58 | initialization is complete but interrupts and tasking are disabled. |
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59 | This field may be NULL to indicate that the hook is not utilized. |
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60 | |
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61 | @item postdriver_hook |
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62 | is the address of the user provided |
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63 | routine that is invoked immediately after the |
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64 | the device drivers and MPCI are initialized. RTEMS |
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65 | initialization is complete but interrupts and tasking are disabled. |
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66 | This field may be NULL to indicate that the hook is not utilized. |
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67 | |
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68 | @item idle_task |
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69 | is the address of the optional user |
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70 | provided routine which is used as the system's IDLE task. If |
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71 | this field is not NULL, then the RTEMS default IDLE task is not |
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72 | used. This field may be NULL to indicate that the default IDLE |
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73 | is to be used. |
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74 | |
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75 | @item do_zero_of_workspace |
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76 | indicates whether RTEMS should |
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77 | zero the Workspace as part of its initialization. If set to |
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78 | TRUE, the Workspace is zeroed. Otherwise, it is not. |
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79 | |
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80 | @item idle_task_stack_size |
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81 | is the size of the RTEMS idle task stack in bytes. |
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82 | If this number is less than MINIMUM_STACK_SIZE, then the |
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83 | idle task's stack will be MINIMUM_STACK_SIZE in byte. |
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84 | |
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85 | @item interrupt_stack_size |
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86 | is the size of the RTEMS |
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87 | allocated interrupt stack in bytes. This value must be at least |
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88 | as large as MINIMUM_STACK_SIZE. |
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89 | |
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90 | @item extra_mpci_receive_server_stack |
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91 | is the extra stack space allocated for the RTEMS MPCI receive server task |
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92 | in bytes. The MPCI receive server may invoke nearly all directives and |
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93 | may require extra stack space on some targets. |
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94 | |
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95 | @item stack_allocate_hook |
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96 | is the address of the optional user provided routine which allocates |
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97 | memory for task stacks. If this hook is not NULL, then a stack_free_hook |
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98 | must be provided as well. |
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99 | |
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100 | @item stack_free_hook |
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101 | is the address of the optional user provided routine which frees |
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102 | memory for task stacks. If this hook is not NULL, then a stack_allocate_hook |
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103 | must be provided as well. |
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104 | |
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105 | @item interrupt_segment |
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106 | is the value of the selector which should be placed in a segment |
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107 | register to access the Interrupt Descriptor Table. |
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108 | |
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109 | @item interrupt_vector_table |
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110 | is the base address of the Interrupt Descriptor Table relative to the |
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111 | interrupt_segment. |
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112 | |
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113 | @end table |
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114 | |
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115 | The contents of the i386 Interrupt Descriptor Table |
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116 | are discussed in Intel's i386 User's Manual. Structure |
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117 | definitions for the i386 IDT is provided by including the file |
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118 | rtems.h. |
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119 | |
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