[ac7d5ef0] | 1 | /* |
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| 2 | * Chain Handler |
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| 3 | * |
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| 4 | * NOTE: |
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| 5 | * |
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| 6 | * The order of this file is to allow proper compilation due to the |
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| 7 | * order of inlining required by the compiler. |
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| 8 | * |
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[08311cc3] | 9 | * COPYRIGHT (c) 1989-1999. |
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[ac7d5ef0] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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[98e4ebf5] | 12 | * The license and distribution terms for this file may be |
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| 13 | * found in the file LICENSE in this distribution or at |
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[dd687d97] | 14 | * http://www.rtems.com/license/LICENSE. |
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[ac7d5ef0] | 15 | * |
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| 16 | * $Id$ |
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| 17 | */ |
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| 18 | |
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| 19 | #include <rtems/system.h> |
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[5e9b32b] | 20 | #include <rtems/score/address.h> |
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| 21 | #include <rtems/score/chain.h> |
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| 22 | #include <rtems/score/isr.h> |
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[ac7d5ef0] | 23 | |
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| 24 | /*PAGE |
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| 25 | * |
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| 26 | * _Chain_Initialize |
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| 27 | * |
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| 28 | * This kernel routine initializes a doubly linked chain. |
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| 29 | * |
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| 30 | * Input parameters: |
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| 31 | * the_chain - pointer to chain header |
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| 32 | * starting_address - starting address of first node |
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| 33 | * number_nodes - number of nodes in chain |
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| 34 | * node_size - size of node in bytes |
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| 35 | * |
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| 36 | * Output parameters: NONE |
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| 37 | */ |
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| 38 | |
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| 39 | void _Chain_Initialize( |
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| 40 | Chain_Control *the_chain, |
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| 41 | void *starting_address, |
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[3127180] | 42 | uint32_t number_nodes, |
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| 43 | uint32_t node_size |
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[ac7d5ef0] | 44 | ) |
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| 45 | { |
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[3127180] | 46 | uint32_t count; |
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[ac7d5ef0] | 47 | Chain_Node *current; |
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| 48 | Chain_Node *next; |
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| 49 | |
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| 50 | count = number_nodes; |
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| 51 | current = _Chain_Head( the_chain ); |
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| 52 | the_chain->permanent_null = NULL; |
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[9c8195a] | 53 | next = starting_address; |
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[ac7d5ef0] | 54 | while ( count-- ) { |
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| 55 | current->next = next; |
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| 56 | next->previous = current; |
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| 57 | current = next; |
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| 58 | next = (Chain_Node *) |
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| 59 | _Addresses_Add_offset( (void *) next, node_size ); |
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| 60 | } |
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| 61 | current->next = _Chain_Tail( the_chain ); |
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| 62 | the_chain->last = current; |
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| 63 | } |
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| 64 | |
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| 65 | /*PAGE |
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| 66 | * |
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| 67 | * _Chain_Get_first_unprotected |
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| 68 | */ |
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| 69 | |
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[8af72be] | 70 | #ifndef RTEMS_INLINES |
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[ac7d5ef0] | 71 | Chain_Node *_Chain_Get_first_unprotected( |
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| 72 | Chain_Control *the_chain |
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| 73 | ) |
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| 74 | { |
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| 75 | Chain_Node *return_node; |
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| 76 | Chain_Node *new_first; |
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| 77 | |
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| 78 | return_node = the_chain->first; |
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| 79 | new_first = return_node->next; |
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| 80 | the_chain->first = new_first; |
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| 81 | new_first->previous = _Chain_Head( the_chain ); |
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| 82 | |
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| 83 | return return_node; |
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| 84 | } |
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[8af72be] | 85 | #endif /* RTEMS_INLINES */ |
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[ac7d5ef0] | 86 | |
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| 87 | /*PAGE |
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| 88 | * |
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| 89 | * _Chain_Get |
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| 90 | * |
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| 91 | * This kernel routine returns a pointer to a node taken from the |
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| 92 | * given chain. |
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| 93 | * |
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| 94 | * Input parameters: |
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| 95 | * the_chain - pointer to chain header |
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| 96 | * |
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| 97 | * Output parameters: |
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| 98 | * return_node - pointer to node in chain allocated |
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| 99 | * CHAIN_END - if no nodes available |
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| 100 | * |
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| 101 | * INTERRUPT LATENCY: |
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| 102 | * only case |
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| 103 | */ |
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| 104 | |
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| 105 | Chain_Node *_Chain_Get( |
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| 106 | Chain_Control *the_chain |
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| 107 | ) |
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| 108 | { |
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| 109 | ISR_Level level; |
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| 110 | Chain_Node *return_node; |
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| 111 | |
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| 112 | return_node = NULL; |
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| 113 | _ISR_Disable( level ); |
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| 114 | if ( !_Chain_Is_empty( the_chain ) ) |
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| 115 | return_node = _Chain_Get_first_unprotected( the_chain ); |
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| 116 | _ISR_Enable( level ); |
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| 117 | return return_node; |
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| 118 | } |
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| 119 | |
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| 120 | /*PAGE |
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| 121 | * |
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| 122 | * _Chain_Append |
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| 123 | * |
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| 124 | * This kernel routine puts a node on the end of the specified chain. |
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| 125 | * |
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| 126 | * Input parameters: |
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| 127 | * the_chain - pointer to chain header |
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| 128 | * node - address of node to put at rear of chain |
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| 129 | * |
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| 130 | * Output parameters: NONE |
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| 131 | * |
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| 132 | * INTERRUPT LATENCY: |
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| 133 | * only case |
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| 134 | */ |
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| 135 | |
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| 136 | void _Chain_Append( |
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| 137 | Chain_Control *the_chain, |
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| 138 | Chain_Node *node |
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| 139 | ) |
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| 140 | { |
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| 141 | ISR_Level level; |
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| 142 | |
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| 143 | _ISR_Disable( level ); |
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| 144 | _Chain_Append_unprotected( the_chain, node ); |
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| 145 | _ISR_Enable( level ); |
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| 146 | } |
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| 147 | |
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| 148 | /*PAGE |
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| 149 | * |
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| 150 | * _Chain_Extract |
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| 151 | * |
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| 152 | * This kernel routine deletes the given node from a chain. |
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| 153 | * |
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| 154 | * Input parameters: |
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| 155 | * node - pointer to node in chain to be deleted |
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| 156 | * |
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| 157 | * Output parameters: NONE |
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| 158 | * |
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| 159 | * INTERRUPT LATENCY: |
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| 160 | * only case |
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| 161 | */ |
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| 162 | |
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| 163 | void _Chain_Extract( |
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| 164 | Chain_Node *node |
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| 165 | ) |
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| 166 | { |
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| 167 | ISR_Level level; |
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| 168 | |
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| 169 | _ISR_Disable( level ); |
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| 170 | _Chain_Extract_unprotected( node ); |
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| 171 | _ISR_Enable( level ); |
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| 172 | } |
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| 173 | |
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| 174 | /*PAGE |
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| 175 | * |
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| 176 | * _Chain_Insert |
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| 177 | * |
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| 178 | * This kernel routine inserts a given node after a specified node |
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| 179 | * a requested chain. |
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| 180 | * |
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| 181 | * Input parameters: |
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| 182 | * after_node - pointer to node in chain to be inserted after |
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| 183 | * node - pointer to node to be inserted |
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| 184 | * |
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| 185 | * Output parameters: NONE |
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| 186 | * |
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| 187 | * INTERRUPT LATENCY: |
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| 188 | * only case |
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| 189 | */ |
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| 190 | |
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| 191 | void _Chain_Insert( |
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| 192 | Chain_Node *after_node, |
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| 193 | Chain_Node *node |
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| 194 | ) |
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| 195 | { |
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| 196 | ISR_Level level; |
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| 197 | |
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| 198 | _ISR_Disable( level ); |
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| 199 | _Chain_Insert_unprotected( after_node, node ); |
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| 200 | _ISR_Enable( level ); |
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| 201 | } |
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