[ac7d5ef0] | 1 | /* |
---|
| 2 | * Chain Handler |
---|
| 3 | * |
---|
| 4 | * NOTE: |
---|
| 5 | * |
---|
| 6 | * The order of this file is to allow proper compilation due to the |
---|
| 7 | * order of inlining required by the compiler. |
---|
| 8 | * |
---|
| 9 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
---|
| 10 | * On-Line Applications Research Corporation (OAR). |
---|
| 11 | * All rights assigned to U.S. Government, 1994. |
---|
| 12 | * |
---|
| 13 | * This material may be reproduced by or for the U.S. Government pursuant |
---|
| 14 | * to the copyright license under the clause at DFARS 252.227-7013. This |
---|
| 15 | * notice must appear in all copies of this file and its derivatives. |
---|
| 16 | * |
---|
| 17 | * $Id$ |
---|
| 18 | */ |
---|
| 19 | |
---|
| 20 | #include <rtems/system.h> |
---|
[5e9b32b] | 21 | #include <rtems/score/address.h> |
---|
| 22 | #include <rtems/score/chain.h> |
---|
| 23 | #include <rtems/score/isr.h> |
---|
[ac7d5ef0] | 24 | |
---|
| 25 | /*PAGE |
---|
| 26 | * |
---|
| 27 | * _Chain_Initialize |
---|
| 28 | * |
---|
| 29 | * This kernel routine initializes a doubly linked chain. |
---|
| 30 | * |
---|
| 31 | * Input parameters: |
---|
| 32 | * the_chain - pointer to chain header |
---|
| 33 | * starting_address - starting address of first node |
---|
| 34 | * number_nodes - number of nodes in chain |
---|
| 35 | * node_size - size of node in bytes |
---|
| 36 | * |
---|
| 37 | * Output parameters: NONE |
---|
| 38 | */ |
---|
| 39 | |
---|
| 40 | void _Chain_Initialize( |
---|
| 41 | Chain_Control *the_chain, |
---|
| 42 | void *starting_address, |
---|
| 43 | unsigned32 number_nodes, |
---|
| 44 | unsigned32 node_size |
---|
| 45 | ) |
---|
| 46 | { |
---|
| 47 | unsigned32 count; |
---|
| 48 | Chain_Node *current; |
---|
| 49 | Chain_Node *next; |
---|
| 50 | |
---|
| 51 | count = number_nodes; |
---|
| 52 | current = _Chain_Head( the_chain ); |
---|
| 53 | the_chain->permanent_null = NULL; |
---|
| 54 | next = (Chain_Node *)starting_address; |
---|
| 55 | while ( count-- ) { |
---|
| 56 | current->next = next; |
---|
| 57 | next->previous = current; |
---|
| 58 | current = next; |
---|
| 59 | next = (Chain_Node *) |
---|
| 60 | _Addresses_Add_offset( (void *) next, node_size ); |
---|
| 61 | } |
---|
| 62 | current->next = _Chain_Tail( the_chain ); |
---|
| 63 | the_chain->last = current; |
---|
| 64 | } |
---|
| 65 | |
---|
| 66 | /*PAGE |
---|
| 67 | * |
---|
| 68 | * _Chain_Get_first_unprotected |
---|
| 69 | */ |
---|
| 70 | |
---|
| 71 | #ifndef USE_INLINES |
---|
| 72 | Chain_Node *_Chain_Get_first_unprotected( |
---|
| 73 | Chain_Control *the_chain |
---|
| 74 | ) |
---|
| 75 | { |
---|
| 76 | Chain_Node *return_node; |
---|
| 77 | Chain_Node *new_first; |
---|
| 78 | |
---|
| 79 | return_node = the_chain->first; |
---|
| 80 | new_first = return_node->next; |
---|
| 81 | the_chain->first = new_first; |
---|
| 82 | new_first->previous = _Chain_Head( the_chain ); |
---|
| 83 | |
---|
| 84 | return return_node; |
---|
| 85 | } |
---|
| 86 | #endif /* USE_INLINES */ |
---|
| 87 | |
---|
| 88 | /*PAGE |
---|
| 89 | * |
---|
| 90 | * _Chain_Get |
---|
| 91 | * |
---|
| 92 | * This kernel routine returns a pointer to a node taken from the |
---|
| 93 | * given chain. |
---|
| 94 | * |
---|
| 95 | * Input parameters: |
---|
| 96 | * the_chain - pointer to chain header |
---|
| 97 | * |
---|
| 98 | * Output parameters: |
---|
| 99 | * return_node - pointer to node in chain allocated |
---|
| 100 | * CHAIN_END - if no nodes available |
---|
| 101 | * |
---|
| 102 | * INTERRUPT LATENCY: |
---|
| 103 | * only case |
---|
| 104 | */ |
---|
| 105 | |
---|
| 106 | Chain_Node *_Chain_Get( |
---|
| 107 | Chain_Control *the_chain |
---|
| 108 | ) |
---|
| 109 | { |
---|
| 110 | ISR_Level level; |
---|
| 111 | Chain_Node *return_node; |
---|
| 112 | |
---|
| 113 | return_node = NULL; |
---|
| 114 | _ISR_Disable( level ); |
---|
| 115 | if ( !_Chain_Is_empty( the_chain ) ) |
---|
| 116 | return_node = _Chain_Get_first_unprotected( the_chain ); |
---|
| 117 | _ISR_Enable( level ); |
---|
| 118 | return return_node; |
---|
| 119 | } |
---|
| 120 | |
---|
| 121 | /*PAGE |
---|
| 122 | * |
---|
| 123 | * _Chain_Append |
---|
| 124 | * |
---|
| 125 | * This kernel routine puts a node on the end of the specified chain. |
---|
| 126 | * |
---|
| 127 | * Input parameters: |
---|
| 128 | * the_chain - pointer to chain header |
---|
| 129 | * node - address of node to put at rear of chain |
---|
| 130 | * |
---|
| 131 | * Output parameters: NONE |
---|
| 132 | * |
---|
| 133 | * INTERRUPT LATENCY: |
---|
| 134 | * only case |
---|
| 135 | */ |
---|
| 136 | |
---|
| 137 | void _Chain_Append( |
---|
| 138 | Chain_Control *the_chain, |
---|
| 139 | Chain_Node *node |
---|
| 140 | ) |
---|
| 141 | { |
---|
| 142 | ISR_Level level; |
---|
| 143 | |
---|
| 144 | _ISR_Disable( level ); |
---|
| 145 | _Chain_Append_unprotected( the_chain, node ); |
---|
| 146 | _ISR_Enable( level ); |
---|
| 147 | } |
---|
| 148 | |
---|
| 149 | /*PAGE |
---|
| 150 | * |
---|
| 151 | * _Chain_Extract |
---|
| 152 | * |
---|
| 153 | * This kernel routine deletes the given node from a chain. |
---|
| 154 | * |
---|
| 155 | * Input parameters: |
---|
| 156 | * node - pointer to node in chain to be deleted |
---|
| 157 | * |
---|
| 158 | * Output parameters: NONE |
---|
| 159 | * |
---|
| 160 | * INTERRUPT LATENCY: |
---|
| 161 | * only case |
---|
| 162 | */ |
---|
| 163 | |
---|
| 164 | void _Chain_Extract( |
---|
| 165 | Chain_Node *node |
---|
| 166 | ) |
---|
| 167 | { |
---|
| 168 | ISR_Level level; |
---|
| 169 | |
---|
| 170 | _ISR_Disable( level ); |
---|
| 171 | _Chain_Extract_unprotected( node ); |
---|
| 172 | _ISR_Enable( level ); |
---|
| 173 | } |
---|
| 174 | |
---|
| 175 | /*PAGE |
---|
| 176 | * |
---|
| 177 | * _Chain_Insert |
---|
| 178 | * |
---|
| 179 | * This kernel routine inserts a given node after a specified node |
---|
| 180 | * a requested chain. |
---|
| 181 | * |
---|
| 182 | * Input parameters: |
---|
| 183 | * after_node - pointer to node in chain to be inserted after |
---|
| 184 | * node - pointer to node to be inserted |
---|
| 185 | * |
---|
| 186 | * Output parameters: NONE |
---|
| 187 | * |
---|
| 188 | * INTERRUPT LATENCY: |
---|
| 189 | * only case |
---|
| 190 | */ |
---|
| 191 | |
---|
| 192 | void _Chain_Insert( |
---|
| 193 | Chain_Node *after_node, |
---|
| 194 | Chain_Node *node |
---|
| 195 | ) |
---|
| 196 | { |
---|
| 197 | ISR_Level level; |
---|
| 198 | |
---|
| 199 | _ISR_Disable( level ); |
---|
| 200 | _Chain_Insert_unprotected( after_node, node ); |
---|
| 201 | _ISR_Enable( level ); |
---|
| 202 | } |
---|