| 1 | ////////////////////////////////////////////////////////////////////////////////// |
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| 2 | // File : hba_driver.c |
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| 3 | // Date : 23/11/2013 |
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| 4 | // Author : alain greiner |
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| 5 | // Copyright (c) UPMC-LIP6 |
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| 6 | /////////////////////////////////////////////////////////////////////////////////// |
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| 7 | // Implementation notes: |
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| 8 | // All accesses to HBA registers are done by the two |
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| 9 | // _hba_set_register() and _hba_get_register() low-level functions, |
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| 10 | // that are handling virtual / physical extended addressing. |
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| 11 | /////////////////////////////////////////////////////////////////////////////////// |
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| 12 | |
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| 13 | #include <giet_config.h> |
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| 14 | #include <hard_config.h> |
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| 15 | #include <hba_driver.h> |
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| 16 | #include <xcu_driver.h> |
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| 17 | #include <kernel_locks.h> |
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| 18 | #include <utils.h> |
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| 19 | #include <tty0.h> |
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| 20 | #include <ctx_handler.h> |
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| 21 | #include <irq_handler.h> |
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| 22 | #include <vmem.h> |
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| 23 | |
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| 24 | /////////////////////////////////////////////////////////////////////////////////// |
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| 25 | // Global variables |
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| 26 | /////////////////////////////////////////////////////////////////////////////////// |
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| 27 | |
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| 28 | // global index ot the task, for each entry in the command list |
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| 29 | __attribute__((section(".kdata"))) |
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| 30 | unsigned int _hba_gtid[32]; |
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| 31 | |
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| 32 | // status of the command, for each entry in the command list |
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| 33 | __attribute__((section(".kdata"))) |
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| 34 | unsigned int _hba_status[32]; |
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| 35 | |
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| 36 | // command list : up to 32 commands |
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| 37 | __attribute__((section(".kdata"))) |
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| 38 | hba_cmd_desc_t _hba_cmd_list[32] __attribute__((aligned(0x10))); |
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| 39 | |
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| 40 | // command tables array : one command table per entry in command list |
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| 41 | __attribute__((section(".kdata"))) |
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| 42 | hba_cmd_table_t _hba_cmd_table[32] __attribute__((aligned(0x1000))); |
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| 43 | |
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| 44 | // command list write index : next slot to register a command |
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| 45 | __attribute__((section(".kdata"))) |
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| 46 | unsigned int _hba_cmd_ptw; |
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| 47 | |
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| 48 | // command list read index : next slot to poll a completed command |
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| 49 | __attribute__((section(".kdata"))) |
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| 50 | unsigned int _hba_cmd_ptr; |
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| 51 | |
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| 52 | ////////////////////////////////////////////////////////////////////////////// |
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| 53 | // This low level function returns the value of register (index) |
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| 54 | ////////////////////////////////////////////////////////////////////////////// |
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| 55 | unsigned int _hba_get_register( unsigned int index ) |
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| 56 | { |
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| 57 | unsigned int* vaddr = (unsigned int*)SEG_IOC_BASE + index; |
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| 58 | return _io_extended_read( vaddr ); |
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| 59 | } |
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| 60 | |
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| 61 | ////////////////////////////////////////////////////////////////////////////// |
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| 62 | // This low level function set a new value in register (index) |
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| 63 | ////////////////////////////////////////////////////////////////////////////// |
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| 64 | void _hba_set_register( unsigned int index, |
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| 65 | unsigned int value ) |
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| 66 | { |
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| 67 | unsigned int* vaddr = (unsigned int*)SEG_IOC_BASE + index; |
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| 68 | _io_extended_write( vaddr, value ); |
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| 69 | } |
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| 70 | |
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| 71 | /////////////////////////////////////////////////////////////////////////////// |
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| 72 | // Extern functions |
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| 73 | /////////////////////////////////////////////////////////////////////////////// |
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| 74 | |
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| 75 | /////////////////////////////////////////////////////////////////////////////// |
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| 76 | // This function register a command in both the command list |
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| 77 | // and the command table, and updates the HBA_PXCI register. |
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| 78 | // return 0 if success, -1 if error |
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| 79 | /////////////////////////////////////////////////////////////////////////////// |
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| 80 | unsigned int _hba_access( unsigned int use_irq, |
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| 81 | unsigned int to_mem, |
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| 82 | unsigned int lba, |
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| 83 | unsigned long long buf_paddr, |
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| 84 | unsigned int count ) |
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| 85 | { |
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| 86 | unsigned int procid = _get_procid(); |
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| 87 | unsigned int x = procid >> (Y_WIDTH + P_WIDTH); |
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| 88 | unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH) - 1); |
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| 89 | unsigned int p = procid & ((1<<P_WIDTH)-1); |
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| 90 | |
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| 91 | #if GIET_DEBUG_IOC_DRIVER |
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| 92 | _printf("\n[HBA DEBUG] P[%d,%d,%d] enters _hba_access at cycle %d\n" |
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| 93 | " use_irq = %d / to_mem = %d / lba = %x / paddr = %l / count = %d\n", |
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| 94 | x , y , p , _get_proctime() , use_irq , to_mem , lba , buf_paddr, count ); |
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| 95 | #endif |
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| 96 | |
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| 97 | unsigned int pxci; // HBA_PXCI register value |
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| 98 | unsigned int ptw; // command list write pointer |
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| 99 | unsigned int pxis; // HBA_PXIS register value |
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| 100 | hba_cmd_desc_t* cmd_desc; // command descriptor pointer |
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| 101 | hba_cmd_table_t* cmd_table; // command table pointer |
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| 102 | |
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| 103 | // check buffer alignment |
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| 104 | if( buf_paddr & 0x1FF ) |
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| 105 | { |
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| 106 | _printf("\n[HBA ERROR] in _hba_access() : buffer not block aligned\n"); |
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| 107 | return -1; |
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| 108 | } |
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| 109 | |
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| 110 | // get pointer on the next possible entry in command list |
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| 111 | ptw = _atomic_increment( &_hba_cmd_ptw , 1 ); |
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| 112 | |
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| 113 | // poll PXCI register until pointed entry empty |
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| 114 | do |
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| 115 | { |
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| 116 | // get PXCI register |
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| 117 | pxci = _hba_get_register( HBA_PXCI ); |
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| 118 | } |
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| 119 | while ( pxci & (1<<ptw) ); |
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| 120 | |
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| 121 | // compute pointers on command descriptor and command table |
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| 122 | cmd_desc = &_hba_cmd_list[ptw]; |
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| 123 | cmd_table = &_hba_cmd_table[ptw]; |
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| 124 | |
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| 125 | // set buffer descriptor in command table |
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| 126 | cmd_table->buffer.dba = (unsigned int)(buf_paddr); |
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| 127 | cmd_table->buffer.dbau = (unsigned int)(buf_paddr >> 32); |
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| 128 | cmd_table->buffer.dbc = count * 512; |
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| 129 | |
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| 130 | // initialize command table header |
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| 131 | cmd_table->header.lba0 = (char)lba; |
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| 132 | cmd_table->header.lba1 = (char)(lba>>8); |
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| 133 | cmd_table->header.lba2 = (char)(lba>>16); |
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| 134 | cmd_table->header.lba3 = (char)(lba>>24); |
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| 135 | cmd_table->header.lba4 = 0; |
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| 136 | cmd_table->header.lba5 = 0; |
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| 137 | |
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| 138 | // initialise command descriptor |
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| 139 | cmd_desc->prdtl[0] = 1; |
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| 140 | cmd_desc->prdtl[1] = 0; |
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| 141 | if( to_mem ) cmd_desc->flag[0] = 0x00; |
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| 142 | else cmd_desc->flag[0] = 0x40; |
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| 143 | |
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| 144 | // set command in PXCI[ptw] |
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| 145 | _hba_set_register( HBA_PXCI, pxci + (1<<ptw) ); |
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| 146 | |
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| 147 | |
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| 148 | ///////////////////////////////////////////////////////////////////// |
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| 149 | // In synchronous mode, we poll the PXCI register until completion |
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| 150 | ///////////////////////////////////////////////////////////////////// |
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| 151 | if ( use_irq == 0 ) |
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| 152 | { |
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| 153 | |
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| 154 | #if GIET_DEBUG_IOC_DRIVER |
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| 155 | _printf("\n[HBA DEBUG] _hba_access() : P[%d,%d,%d] launch transfer" |
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| 156 | " in polling mode at cycle %d\n", |
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| 157 | x , y , p , _get_proctime() ); |
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| 158 | #endif |
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| 159 | // disable IRQs in PXIE register |
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| 160 | _hba_set_register( HBA_PXIE , 0 ); |
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| 161 | |
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| 162 | // poll PXCI[ptw] until command completed by HBA |
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| 163 | do |
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| 164 | { |
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| 165 | pxci = _hba_get_register( HBA_PXCI ) & (1<<ptw); |
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| 166 | |
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| 167 | #if GIET_DEBUG_IOC_DRIVER |
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| 168 | _printf("\n[HBA DEBUG] _hba_access() : P[%d,%d,%d] wait on HBA_STATUS ...\n", |
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| 169 | x , y , p ); |
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| 170 | #endif |
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| 171 | } |
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| 172 | while( pxci & (1<<ptw) ); |
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| 173 | |
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| 174 | // get PXIS register |
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| 175 | pxis = _hba_get_register( HBA_PXIS ); |
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| 176 | |
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| 177 | // reset PXIS register |
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| 178 | _hba_set_register( HBA_PXIS , 0 ); |
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| 179 | } |
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| 180 | |
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| 181 | ///////////////////////////////////////////////////////////////// |
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| 182 | // in descheduling mode, we deschedule the task |
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| 183 | // and use an interrupt to reschedule the task. |
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| 184 | // We need a critical section, because we must reset the RUN bit |
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| 185 | // before to launch the transfer, and we don't want to be |
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| 186 | // descheduled between these two operations. |
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| 187 | ///////////////////////////////////////////////////////////////// |
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| 188 | else |
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| 189 | { |
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| 190 | |
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| 191 | #if GIET_DEBUG_IOC_DRIVER |
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| 192 | _printf("\n[HBA DEBUG] _hba_access() : P[%d,%d,%d] launch transfer" |
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| 193 | " in descheduling mode at cycle %d\n", |
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| 194 | x , y , p , _get_proctime() ); |
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| 195 | #endif |
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| 196 | unsigned int save_sr; |
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| 197 | unsigned int ltid = _get_current_task_id(); |
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| 198 | |
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| 199 | // activates HBA interrupts |
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| 200 | _hba_set_register( HBA_PXIE , 0x00000001 ); |
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| 201 | |
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| 202 | // set _hba_gtid[ptw] |
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| 203 | _hba_gtid[ptw] = (procid<<16) + ltid; |
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| 204 | |
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| 205 | // enters critical section |
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| 206 | _it_disable( &save_sr ); |
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| 207 | |
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| 208 | // reset runnable |
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| 209 | _set_task_slot( x, y, p, ltid, CTX_RUN_ID, 0 ); |
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| 210 | |
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| 211 | // deschedule task |
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| 212 | _ctx_switch(); |
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| 213 | |
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| 214 | #if GIET_DEBUG_IOC_DRIVER |
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| 215 | _printf("\n[HBA DEBUG] _hba_access() : P[%d,%d,%d] resume execution at cycle %d\n", |
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| 216 | x , y , p , _get_proctime() ); |
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| 217 | #endif |
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| 218 | |
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| 219 | // restore SR |
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| 220 | _it_restore( &save_sr ); |
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| 221 | |
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| 222 | // get command status |
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| 223 | pxis = _hba_status[ptw]; |
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| 224 | } |
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| 225 | |
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| 226 | #if GIET_DEBUG_IOC_DRIVER |
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| 227 | _printf("\n[HBA DEBUG] _hba_access() : P[%d,%d,%d] exit at cycle %d\n", |
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| 228 | x , y , p , _get_proctime() ); |
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| 229 | #endif |
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| 230 | |
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| 231 | if ( pxis & 0x40000000 ) return pxis; |
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| 232 | else return 0; |
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| 233 | |
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| 234 | } // end _hba_access() |
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| 235 | |
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| 236 | |
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| 237 | //////////////////////// |
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| 238 | unsigned int _hba_init() |
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| 239 | { |
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| 240 | unsigned int flags; |
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| 241 | unsigned int vaddr; |
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| 242 | unsigned long long paddr; |
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| 243 | unsigned int c; |
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| 244 | unsigned int pxclb; |
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| 245 | unsigned int pxclbu; |
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| 246 | |
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| 247 | // command list pointers |
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| 248 | _hba_cmd_ptw = 0; |
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| 249 | _hba_cmd_ptr = 0; |
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| 250 | |
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| 251 | // Command list physical addresse |
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| 252 | vaddr = (unsigned int)(_hba_cmd_list); |
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| 253 | paddr = _v2p_translate( vaddr , &flags ); |
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| 254 | pxclb = (unsigned int)paddr; |
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| 255 | pxclbu = (unsigned int)(paddr>>32); |
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| 256 | |
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| 257 | // Command tables physical addresses |
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| 258 | for( c=0 ; c<32 ; c++ ) |
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| 259 | { |
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| 260 | // compute command table physical address |
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| 261 | // for one entry in the command list |
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| 262 | vaddr = (unsigned int)(&_hba_cmd_table[c]); |
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| 263 | paddr = _v2p_translate( vaddr , &flags ); |
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| 264 | |
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| 265 | // initialise the corresponding command descriptor |
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| 266 | _hba_cmd_list[c].ctba = (unsigned int)paddr; |
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| 267 | _hba_cmd_list[c].ctbau = (unsigned int)(paddr>>32); |
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| 268 | } |
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| 269 | |
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| 270 | // set HBA registers |
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| 271 | _hba_set_register( HBA_PXCLB , pxclb ); |
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| 272 | _hba_set_register( HBA_PXCLBU, pxclbu ); |
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| 273 | _hba_set_register( HBA_PXIE , 0 ); |
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| 274 | _hba_set_register( HBA_PXIS , 0 ); |
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| 275 | _hba_set_register( HBA_PXCI , 0 ); |
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| 276 | _hba_set_register( HBA_PXCMD , 1 ); |
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| 277 | |
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| 278 | return 0; |
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| 279 | } |
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| 280 | |
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| 281 | |
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| 282 | ///////////////////////////////////// |
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| 283 | void _hba_isr( unsigned int irq_type, // HWI / WTI |
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| 284 | unsigned int irq_id, // index returned by ICU |
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| 285 | unsigned int channel ) // unused |
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| 286 | { |
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| 287 | // get HBA_PXCI containing commands status |
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| 288 | unsigned int pxci = _hba_get_register( HBA_PXCI ); |
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| 289 | |
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| 290 | // scan active commands from (_hba_cmd_ptr) to (_hba_cmd_ptw-1) |
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| 291 | unsigned int c; |
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| 292 | for ( c = _hba_cmd_ptr ; |
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| 293 | c != _hba_cmd_ptw ; |
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| 294 | c = (c + 1) % 32 ) |
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| 295 | { |
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| 296 | if ( (pxci & (1<<c)) == 0 ) // command completed |
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| 297 | { |
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| 298 | // increment read pointer; |
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| 299 | _hba_cmd_ptr++; |
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| 300 | |
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| 301 | // save PXIS register |
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| 302 | _hba_status[c] = _hba_get_register( HBA_PXIS ); |
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| 303 | |
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| 304 | // reset PXIS register |
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| 305 | _hba_set_register( HBA_PXIS , 0 ); |
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| 306 | |
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| 307 | // identify waiting task |
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| 308 | unsigned int remote_procid = _hba_gtid[c]>>16; |
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| 309 | unsigned int ltid = _hba_gtid[c] & 0xFFFF; |
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| 310 | unsigned int remote_cluster = remote_procid >> P_WIDTH; |
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| 311 | unsigned int remote_x = remote_cluster >> Y_WIDTH; |
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| 312 | unsigned int remote_y = remote_cluster & ((1<<Y_WIDTH)-1); |
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| 313 | unsigned int remote_p = remote_procid & ((1<<P_WIDTH)-1); |
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| 314 | |
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| 315 | // re-activates waiting task |
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| 316 | _set_task_slot( remote_x, |
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| 317 | remote_y, |
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| 318 | remote_p, |
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| 319 | ltid, |
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| 320 | CTX_RUN_ID, |
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| 321 | 1 ); |
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| 322 | |
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| 323 | // send a WAKUP WTI to processor running the waiting task |
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| 324 | _xcu_send_wti( remote_cluster , |
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| 325 | remote_p , |
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| 326 | 0 ); // don't force context switch |
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| 327 | |
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| 328 | #if GIET_DEBUG_IOC_DRIVER |
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| 329 | unsigned int procid = _get_procid(); |
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| 330 | unsigned int x = procid >> (Y_WIDTH + P_WIDTH); |
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| 331 | unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH)-1); |
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| 332 | unsigned int p = procid & ((1<<P_WIDTH)-1); |
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| 333 | _printf("\n[HBA DEBUG] Processor[%d,%d,%d] executes _hba_isr() :\n" |
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| 334 | " resume task %d running on P[%d,%d,%d] / status = %x at cyle %d\n", |
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| 335 | x , y , p , |
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| 336 | ltid , remote_x , remote_y , remote_p , _hba_status[c] , _get_proctime() ); |
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| 337 | #endif |
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| 338 | } |
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| 339 | else // command non completed |
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| 340 | { |
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| 341 | break; |
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| 342 | } |
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| 343 | } |
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| 344 | } // end _hba_isr() |
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| 345 | |
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| 346 | // Local Variables: |
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| 347 | // tab-width: 4 |
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| 348 | // c-basic-offset: 4 |
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| 349 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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| 350 | // indent-tabs-mode: nil |
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| 351 | // End: |
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| 352 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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| 353 | |
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