[622] | 1 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 2 | // File : stdio.c |
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| 3 | // Written by Alain Greiner |
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| 4 | // Date : janvier 2014 |
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| 5 | // |
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| 6 | // This file define varions functions that can be used by applications to access |
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| 7 | // peripherals, for the TSAR multi-processors multi_clusters architecture. |
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| 8 | // There is NO separation between application code and system code, as the |
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| 9 | // application are running in kernel mode without system calls. |
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| 10 | // This basic GIET does not support virtual memory, and does not support multi-tasking. |
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| 11 | // |
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| 12 | // The supported peripherals are: |
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| 13 | // - the SoClib multi_tty |
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| 14 | // - The SoCLib frame_buffer |
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| 15 | // - The SoCLib block_device |
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| 16 | // |
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| 17 | // The following parameters must be defined in the hard_config.h file. |
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| 18 | // - X_SIZE : number of clusters in a row |
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| 19 | // - Y_SIZE : number of clusters in a column |
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| 20 | // - X_WIDTH : number of bits for X field in proc_id |
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| 21 | // - Y_WIDTH : number of bits for Y field in proc_id |
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| 22 | // - NB_PROCS_MAX : max number of processor per cluster |
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| 23 | // - NB_TTY_CHANNELS : max number of TTY channels |
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| 24 | // |
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| 25 | // The follobing base addresses must be defined in the ldscript |
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| 26 | // - seg_tty_base |
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| 27 | // - seg_fbf_base |
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| 28 | // - seg_ioc_base |
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| 29 | //////////////////////////////////////////////////////////////////////////////////////// |
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[158] | 30 | |
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[622] | 31 | #include "stdio.h" |
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[158] | 32 | |
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[622] | 33 | #define NB_LOCKS 256 |
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| 34 | #define NB_BARRIERS 16 |
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[158] | 35 | |
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[622] | 36 | #define in_drivers __attribute__((section (".drivers"))) |
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| 37 | #define in_unckdata __attribute__((section (".unckdata"))) |
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[158] | 38 | |
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[622] | 39 | ////////////////////////////////////////////////////////////// |
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| 40 | // various informations that must be defined in ldscript |
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| 41 | ////////////////////////////////////////////////////////////// |
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[158] | 42 | |
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[622] | 43 | struct plouf; |
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| 44 | |
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| 45 | extern struct plouf seg_tty_base; |
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| 46 | extern struct plouf seg_fbf_base; |
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| 47 | extern struct plouf seg_ioc_base; |
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| 48 | extern struct plouf seg_mmc_base; |
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| 49 | |
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| 50 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 51 | // Global uncachable variables for synchronization between drivers and ISRs |
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| 52 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 53 | |
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| 54 | in_unckdata int volatile _ioc_lock = 0; |
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| 55 | in_unckdata int volatile _ioc_done = 0; |
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| 56 | in_unckdata int volatile _ioc_status; |
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| 57 | |
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| 58 | in_unckdata char volatile _tty_get_buf[NB_TTY_CHANNELS]; |
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| 59 | in_unckdata int volatile _tty_get_full[NB_TTY_CHANNELS] = { [0 ... NB_TTY_CHANNELS-1] = 0 }; |
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| 60 | |
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| 61 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 62 | // Global uncachable variables for inter-task barriers |
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| 63 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 64 | |
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| 65 | in_unckdata int volatile _barrier_value[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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| 66 | in_unckdata int volatile _barrier_count[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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| 67 | in_unckdata int volatile _barrier_lock[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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| 68 | |
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| 69 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 70 | // Global uncachable variables for spin_locks using LL/C instructions |
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| 71 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 72 | |
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| 73 | in_unckdata int volatile _spin_lock[NB_LOCKS] = { [0 ... NB_LOCKS-1] = 0 }; |
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| 74 | |
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| 75 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 76 | // Taken from MutekH. |
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| 77 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 78 | in_drivers void* _memcpy( void* _dst, |
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| 79 | const void* _src, |
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| 80 | unsigned int size ) |
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[158] | 81 | { |
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[622] | 82 | unsigned int *dst = _dst; |
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| 83 | const unsigned int *src = _src; |
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| 84 | if ( ! ((unsigned int)dst & 3) && ! ((unsigned int)src & 3) ) |
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| 85 | { |
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| 86 | while (size > 3) |
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| 87 | { |
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| 88 | *dst++ = *src++; |
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| 89 | size -= 4; |
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| 90 | } |
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| 91 | } |
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[158] | 92 | |
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[622] | 93 | unsigned char *cdst = (unsigned char*)dst; |
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| 94 | unsigned char *csrc = (unsigned char*)src; |
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| 95 | |
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| 96 | while (size--) |
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| 97 | { |
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| 98 | *cdst++ = *csrc++; |
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| 99 | } |
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| 100 | return _dst; |
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[158] | 101 | } |
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| 102 | |
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[622] | 103 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 104 | // Access CP0 and returns processor ident |
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| 105 | // No more than 1024 processors... |
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| 106 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 107 | in_drivers unsigned int _procid() |
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[158] | 108 | { |
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[622] | 109 | unsigned int ret; |
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| 110 | asm volatile( "mfc0 %0, $15, 1": "=r"(ret) ); |
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| 111 | return (ret & 0x3FF); |
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[158] | 112 | } |
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[622] | 113 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 114 | // Access CP0 and returns processor time |
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| 115 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 116 | in_drivers unsigned int _proctime() |
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[158] | 117 | { |
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[622] | 118 | unsigned int ret; |
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| 119 | asm volatile( "mfc0 %0, $9": "=r"(ret) ); |
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| 120 | return ret; |
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[158] | 121 | } |
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[622] | 122 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 123 | // Returns the number of processsors controled by the GIET |
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| 124 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 125 | in_drivers unsigned int _procnumber() |
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[158] | 126 | { |
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[622] | 127 | return (unsigned int)(NB_PROCS_MAX * X_SIZE * Y_SIZE); |
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[158] | 128 | } |
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[622] | 129 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 130 | // Access CP0 and mask IRQs |
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| 131 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 132 | in_drivers void _it_mask() |
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[158] | 133 | { |
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[622] | 134 | int tmp; |
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| 135 | asm volatile("mfc0 %0, $12" : "=r" (tmp) ); |
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| 136 | asm volatile("ori %0, %0, 1" : "=r" (tmp) ); |
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| 137 | asm volatile("mtc0 %0, $12" : "=r" (tmp) ); |
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[158] | 138 | } |
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[622] | 139 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 140 | // Access CP0 and enable IRQs |
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| 141 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 142 | in_drivers void _it_enable() |
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[158] | 143 | { |
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[622] | 144 | int tmp; |
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| 145 | asm volatile("mfc0 %0, $12" : "=r" (tmp) ); |
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| 146 | asm volatile("addi %0, %0, -1" : "=r" (tmp) ); |
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| 147 | asm volatile("mtc0 %0, $12" : "=r" (tmp) ); |
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[158] | 148 | } |
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[622] | 149 | ////////////////////////////////////////////////////////////////////// |
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| 150 | // Invalidate all cache lines corresponding to a memory buffer. |
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| 151 | // This is used by the block_device driver. |
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| 152 | ///////////////////////////////////////////////////////////////////////// |
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| 153 | in_drivers void _dcache_buf_invalidate(const void * buffer, size_t size) |
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| 154 | { |
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| 155 | size_t i; |
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| 156 | size_t dcache_line_size; |
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[158] | 157 | |
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[622] | 158 | // retrieve dcache line size from config register (bits 12:10) |
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| 159 | asm volatile("mfc0 %0, $16, 1" : "=r" (dcache_line_size)); |
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| 160 | |
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| 161 | dcache_line_size = 2 << ((dcache_line_size>>10) & 0x7); |
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| 162 | |
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| 163 | // iterate on lines to invalidate each one of them |
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| 164 | for ( i=0; i<size; i+=dcache_line_size ) |
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| 165 | asm volatile(" cache %0, %1" |
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| 166 | : |
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| 167 | :"i" (0x11), "R" (*((char*)buffer+i))); |
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| 168 | } |
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| 169 | |
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| 170 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 171 | // Exit (suicide) after printing message on a TTY terminal. |
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| 172 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 173 | in_drivers void _exit() |
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[158] | 174 | { |
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[622] | 175 | unsigned int proc_id = _procid(); |
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| 176 | unsigned int l = proc_id % NB_PROCS_MAX; |
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| 177 | unsigned int x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
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| 178 | unsigned int y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
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| 179 | |
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| 180 | _tty_printf("\n\n!!! Exit Processor (%d,%d,%d) !!!\n", x, y, l ); |
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| 181 | |
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| 182 | while(1) asm volatile("nop"); // infinite loop... |
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[158] | 183 | } |
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[622] | 184 | |
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| 185 | ///////////////////////////////////////////////////////////////////////// |
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| 186 | // convert a 32 bits unsigned int to a string of 10 decimal characters. |
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| 187 | ///////////////////////////////////////////////////////////////////////// |
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| 188 | in_drivers void _itoa_dec(unsigned val, char* buf) |
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[158] | 189 | { |
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[622] | 190 | const char DecTab[] = "0123456789"; |
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| 191 | unsigned int i; |
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| 192 | for( i=0 ; i<10 ; i++ ) |
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| 193 | { |
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| 194 | if( (val!=0) || (i==0) ) buf[9-i] = DecTab[val % 10]; |
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| 195 | else buf[9-i] = 0x20; |
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| 196 | val /= 10; |
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[158] | 197 | } |
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| 198 | } |
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[622] | 199 | ////////////////////////////////////////////////////////////////////////// |
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| 200 | // convert a 32 bits unsigned int to a string of 8 hexadecimal characters. |
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| 201 | /////////////////////////////////////////////////////////////////////////// |
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| 202 | in_drivers void _itoa_hex(unsigned int val, char* buf) |
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[158] | 203 | { |
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[622] | 204 | const char HexaTab[] = "0123456789ABCD"; |
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| 205 | unsigned int i; |
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| 206 | for( i=0 ; i<8 ; i++ ) |
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| 207 | { |
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| 208 | buf[7-i] = HexaTab[val % 16]; |
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| 209 | val /= 16; |
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[158] | 210 | } |
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| 211 | } |
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[622] | 212 | |
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| 213 | |
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| 214 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 215 | // VCI MULTI_TTY |
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| 216 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 217 | // The total number of TTY terminals is defined by NB_TTY_CHANNELS. |
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| 218 | // 1. If there is only one terminal, it is supposed to be shared, and used by |
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| 219 | // all processors: a lock must be taken before display. |
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| 220 | // 2. If there is several terminals, and the number of processors is smaller |
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| 221 | // than the number of terminals, there is one terminal per processor, but |
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| 222 | // the TTY index is not equal to the proc_id, due to cluster indexing policy: |
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| 223 | // - proc_id = cluster_xy * NB_PROCS_MAX + local_id (with cluster_xy = x << Y_WIDTH + y) |
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| 224 | // - tty_id = cluster_id * NB_PROCS_MAX + local_id (with cluster_id = x * Y_SIZE + y) |
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| 225 | // 3. If the computed tty_id is larger than NB_TTY_CHANNELS, an error is returned. |
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| 226 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 227 | // Write one or several characters directly from a fixed length user buffer |
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| 228 | // to the TTY_WRITE register of the TTY controler. |
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| 229 | // This is a non blocking call : it test the TTY_STATUS register. |
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| 230 | // If the TTY_STATUS_WRITE bit is set, the transfer stops and the function |
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| 231 | // returns the number of characters that have been actually written. |
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| 232 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 233 | in_drivers int _tty_write( char* buffer, |
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| 234 | unsigned int length, |
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| 235 | unsigned int channel ) |
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[158] | 236 | { |
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[622] | 237 | char* tty_address; |
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| 238 | unsigned int base = (unsigned int)&seg_tty_base; |
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| 239 | unsigned int nwritten = 0; |
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| 240 | int i; |
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| 241 | |
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| 242 | tty_address = (char*)(base + channel*TTY_SPAN*4); |
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| 243 | |
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| 244 | for ( i=0 ; i < length ; i++ ) |
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[158] | 245 | { |
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[622] | 246 | if((tty_address[TTY_STATUS*4] & 0x2) == 0x2) break; |
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| 247 | else |
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| 248 | { |
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| 249 | tty_address[TTY_WRITE*4] = buffer[i]; // write character |
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| 250 | nwritten++; |
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| 251 | } |
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[158] | 252 | } |
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[622] | 253 | |
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| 254 | return nwritten; |
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[158] | 255 | } |
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[622] | 256 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 257 | // Fetch one character directly from the TTY_READ register of the TTY controler, |
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| 258 | // and writes this character to the user buffer. |
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| 259 | // This is a non blocking call : it returns 0 if the register is empty, |
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| 260 | // and returns 1 if the register is full. |
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| 261 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 262 | in_drivers int _tty_read( char* buffer, |
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| 263 | unsigned int channel ) |
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[158] | 264 | { |
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[622] | 265 | char* tty_address; |
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| 266 | unsigned int base = (unsigned int)&seg_tty_base; |
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| 267 | |
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| 268 | tty_address = (char*)(base + channel*TTY_SPAN*4); |
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| 269 | |
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| 270 | if((tty_address[TTY_STATUS*4] & 0x1) == 0x1) |
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[158] | 271 | { |
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[622] | 272 | buffer[0] = tty_address[TTY_READ*4]; |
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| 273 | return 1; |
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[158] | 274 | } |
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[622] | 275 | else |
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| 276 | { |
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| 277 | return 0; |
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| 278 | } |
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[158] | 279 | } |
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[622] | 280 | ////////////////////////////////////////////////////////////////////////////// |
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| 281 | // This function displays a string on TTY0. |
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| 282 | // The string must be terminated by a NUL character. |
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| 283 | ////////////////////////////////////////////////////////////////////////////// |
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| 284 | in_drivers void _tty_puts( char* string ) |
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[158] | 285 | { |
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[622] | 286 | int length = 0; |
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| 287 | while (string[length] != 0) length++; |
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| 288 | _tty_write( string, length, 0 ); |
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| 289 | } |
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[158] | 290 | |
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[622] | 291 | /////////////////////////////////////////////////////////////////////////////// |
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| 292 | // This function displays a 32 bits unsigned int as an hexa string on TTY0. |
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| 293 | /////////////////////////////////////////////////////////////////////////////// |
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| 294 | in_drivers void _tty_putx(unsigned int val) |
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| 295 | { |
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| 296 | static const char HexaTab[] = "0123456789ABCDEF"; |
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| 297 | char buf[11]; |
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| 298 | unsigned int c; |
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| 299 | |
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| 300 | buf[0] = '0'; |
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| 301 | buf[1] = 'x'; |
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| 302 | buf[10] = 0; |
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| 303 | |
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| 304 | for (c = 0; c < 8; c++) |
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| 305 | { |
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| 306 | buf[9 - c] = HexaTab[val & 0xF]; |
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| 307 | val = val >> 4; |
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| 308 | } |
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| 309 | _tty_puts( buf ); |
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| 310 | } |
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| 311 | |
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| 312 | /////////////////////////////////////////////////////////////////////////////// |
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| 313 | // This function displays a 32 bits unsigned int as a decimal string on TTY0. |
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| 314 | /////////////////////////////////////////////////////////////////////////////// |
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| 315 | in_drivers void _tty_putd( unsigned int val ) |
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| 316 | { |
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| 317 | static const char DecTab[] = "0123456789"; |
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| 318 | char buf[11]; |
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| 319 | unsigned int i; |
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| 320 | unsigned int first; |
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| 321 | |
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| 322 | buf[10] = 0; |
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| 323 | |
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| 324 | for (i = 0; i < 10; i++) |
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[158] | 325 | { |
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[622] | 326 | if ((val != 0) || (i == 0)) |
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| 327 | { |
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| 328 | buf[9 - i] = DecTab[val % 10]; |
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| 329 | first = 9 - i; |
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| 330 | } |
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| 331 | else |
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| 332 | { |
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| 333 | break; |
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| 334 | } |
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| 335 | val /= 10; |
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| 336 | } |
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| 337 | _tty_puts( &buf[first] ); |
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| 338 | } |
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[158] | 339 | |
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[622] | 340 | ////////////////////////////////////////////////////////////////////////////// |
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| 341 | // This function try to take the hardwired lock protecting exclusive access |
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| 342 | // to TTY terminal identified by the channel argument. |
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| 343 | // It returns only when the lock has been successfully taken. |
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| 344 | ////////////////////////////////////////////////////////////////////////////// |
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| 345 | in_drivers void _tty_get_lock( unsigned int channel ) |
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| 346 | { |
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| 347 | unsigned int* tty_address = (unsigned int *) &seg_tty_base; |
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| 348 | while ( tty_address[channel * TTY_SPAN + TTY_CONFIG] ) asm volatile("nop"); |
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| 349 | } |
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[158] | 350 | |
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[622] | 351 | ////////////////////////////////////////////////////////////////////////////// |
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| 352 | // This function releases the hardwired lock protecting exclusive access |
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| 353 | // to TTY terminal identified by the channel argument. |
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| 354 | ////////////////////////////////////////////////////////////////////////////// |
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| 355 | in_drivers void _tty_release_lock( unsigned int channel ) |
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| 356 | { |
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| 357 | unsigned int* tty_address = (unsigned int *) &seg_tty_base; |
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| 358 | tty_address[channel * TTY_SPAN + TTY_CONFIG] = 0; |
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| 359 | } |
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| 360 | |
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| 361 | ////////////////////////////////////////////////////////////////////////////// |
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| 362 | // This function fetch a single ascii character from a terminal |
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| 363 | // implicitely defined by the processor ID. |
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| 364 | // It is a blocking function. |
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| 365 | ////////////////////////////////////////////////////////////////////////////// |
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| 366 | in_drivers void _tty_getc( char* buf ) |
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| 367 | { |
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| 368 | unsigned int proc_id = _procid(); |
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| 369 | unsigned int channel; |
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| 370 | unsigned int l; |
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| 371 | unsigned int x; |
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| 372 | unsigned int y; |
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| 373 | |
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| 374 | // compute TTY terminal index |
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| 375 | if ( NB_TTY_CHANNELS == 1 ) |
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| 376 | { |
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| 377 | channel = 0; |
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| 378 | } |
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| 379 | else |
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| 380 | { |
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| 381 | l = (proc_id % NB_PROCS_MAX); |
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| 382 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
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| 383 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
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| 384 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
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| 385 | if (channel >= NB_TTY_CHANNELS ) |
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[158] | 386 | { |
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[622] | 387 | _tty_get_lock( 0 ); |
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| 388 | _tty_puts( "ERROR in _tty_getc()\n" ); |
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| 389 | _tty_release_lock( 0 ); |
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| 390 | _exit(); |
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[158] | 391 | } |
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[622] | 392 | } |
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| 393 | |
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| 394 | while( _tty_read( buf, channel ) == 0 ) asm volatile("nop"); |
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[158] | 395 | } |
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[622] | 396 | |
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| 397 | ////////////////////////////////////////////////////////////////////////////// |
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| 398 | // Fetch a string of decimal characters (most significant digit first) |
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| 399 | // to build a 32 bits unsigned int. |
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| 400 | // The terminal index is implicitely defined by the processor ID. |
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| 401 | // This is a blocking function. |
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| 402 | // The decimal characters are written in a 32 characters buffer |
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| 403 | // until a <LF> or <CR> character is read. |
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| 404 | // The <DEL> character is interpreted, and previous characters can be |
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| 405 | // cancelled. All others characters are ignored. |
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| 406 | // When the <LF> or <CR> character is received, the string is converted |
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| 407 | // to an unsigned int value. If the number of decimal digit is too large |
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| 408 | // for the 32 bits range, the zero value is returned. |
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| 409 | ////////////////////////////////////////////////////////////////////////////// |
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| 410 | in_drivers void _tty_getw( unsigned int* word_buffer ) |
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[158] | 411 | { |
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[622] | 412 | char buf[32]; |
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| 413 | char byte; |
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| 414 | char cancel_string[3] = { 0x08, 0x20, 0x08 }; |
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| 415 | char zero = 0x30; |
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| 416 | unsigned int save = 0; |
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| 417 | unsigned int val = 0; |
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| 418 | unsigned int done = 0; |
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| 419 | unsigned int overflow = 0; |
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| 420 | unsigned int max = 0; |
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| 421 | unsigned int proc_id = _procid(); |
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| 422 | unsigned int i; |
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| 423 | unsigned int channel; |
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| 424 | unsigned int l; |
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| 425 | unsigned int x; |
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| 426 | unsigned int y; |
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[158] | 427 | |
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[622] | 428 | // compute TTY terminal index |
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| 429 | if ( NB_TTY_CHANNELS == 1 ) |
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[158] | 430 | { |
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[622] | 431 | channel = 0; |
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| 432 | } |
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| 433 | else |
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| 434 | { |
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| 435 | l = (proc_id % NB_PROCS_MAX); |
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| 436 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
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| 437 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
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| 438 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
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| 439 | if (channel >= NB_TTY_CHANNELS ) |
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| 440 | { |
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| 441 | _tty_get_lock( 0 ); |
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| 442 | _tty_puts( "ERROR in _tty_getw()\n" ); |
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| 443 | _tty_release_lock( 0 ); |
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| 444 | _exit(); |
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| 445 | } |
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| 446 | } |
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[158] | 447 | |
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[622] | 448 | while( done == 0 ) |
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| 449 | { |
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| 450 | _tty_read( &byte, channel ); |
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| 451 | |
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| 452 | if (( byte > 0x2F) && (byte < 0x3A)) // decimal character |
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[158] | 453 | { |
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[622] | 454 | buf[max] = byte; |
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| 455 | max++; |
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| 456 | _tty_write( &byte, 1, channel ); |
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| 457 | } |
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| 458 | else if ( (byte == 0x0A) || (byte == 0x0D) ) // LF or CR character |
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| 459 | { |
---|
| 460 | done = 1; |
---|
| 461 | } |
---|
| 462 | else if ( byte == 0x7F ) // DEL character |
---|
| 463 | { |
---|
| 464 | if (max > 0) |
---|
[158] | 465 | { |
---|
[622] | 466 | max--; // cancel the character |
---|
| 467 | _tty_write( cancel_string, 3, channel ); |
---|
[158] | 468 | } |
---|
| 469 | } |
---|
| 470 | } // end while |
---|
| 471 | |
---|
| 472 | // string conversion |
---|
| 473 | for( i=0 ; i<max ; i++ ) |
---|
| 474 | { |
---|
| 475 | val = val*10 + (buf[i] - 0x30); |
---|
| 476 | if (val < save) overflow = 1; |
---|
| 477 | save = val; |
---|
| 478 | } |
---|
| 479 | if (overflow == 0) |
---|
| 480 | { |
---|
| 481 | *word_buffer = val; // return decimal value |
---|
| 482 | } |
---|
| 483 | else |
---|
| 484 | { |
---|
| 485 | for( i=0 ; i<max ; i++) // cancel the string |
---|
| 486 | { |
---|
[622] | 487 | _tty_write( cancel_string, 3, channel ); |
---|
[158] | 488 | } |
---|
[622] | 489 | _tty_write( &zero, 1, channel ); |
---|
[158] | 490 | *word_buffer = 0; // return 0 value |
---|
| 491 | } |
---|
| 492 | } |
---|
[622] | 493 | |
---|
| 494 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 495 | // This function is a simplified version of the mutek_printf() function. |
---|
| 496 | // It takes the TTY lock on the selected channel for exclusive access. |
---|
| 497 | // Only a limited number of formats are supported: |
---|
| 498 | // - %d : signed decimal |
---|
| 499 | // - %u : unsigned decimal |
---|
| 500 | // - %x : hexadecimal |
---|
| 501 | // - %c : char |
---|
| 502 | // - %s : string |
---|
| 503 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 504 | in_drivers void _tty_printf( char *format, ...) |
---|
[158] | 505 | { |
---|
| 506 | va_list ap; |
---|
[622] | 507 | va_start( ap, format ); |
---|
[158] | 508 | |
---|
[622] | 509 | unsigned int channel; |
---|
| 510 | unsigned int l; |
---|
| 511 | unsigned int x; |
---|
| 512 | unsigned int y; |
---|
| 513 | unsigned int proc_id = _procid(); |
---|
| 514 | |
---|
| 515 | // compute TTY channel |
---|
| 516 | if ( NB_TTY_CHANNELS == 1 ) |
---|
| 517 | { |
---|
| 518 | channel = 0; |
---|
| 519 | } |
---|
| 520 | else |
---|
| 521 | { |
---|
| 522 | l = (proc_id % NB_PROCS_MAX); |
---|
| 523 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
---|
| 524 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
---|
| 525 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
---|
| 526 | if (channel >= NB_TTY_CHANNELS ) |
---|
| 527 | { |
---|
| 528 | _tty_get_lock( 0 ); |
---|
| 529 | _tty_puts("ERROR in _tty_printf() for proc[" ); |
---|
| 530 | _tty_putd( x ); |
---|
| 531 | _tty_puts(","); |
---|
| 532 | _tty_putd( y ); |
---|
| 533 | _tty_puts(","); |
---|
| 534 | _tty_putd( l ); |
---|
| 535 | _tty_puts("] / TTY channel too large = "); |
---|
| 536 | _tty_putd( channel ); |
---|
| 537 | _tty_puts("\n"); |
---|
| 538 | _tty_release_lock( 0 ); |
---|
| 539 | _exit(); |
---|
| 540 | } |
---|
| 541 | } |
---|
| 542 | |
---|
| 543 | // take the TTY lock |
---|
| 544 | _tty_get_lock( channel ); |
---|
| 545 | |
---|
[158] | 546 | printf_text: |
---|
| 547 | |
---|
[622] | 548 | while (*format) |
---|
| 549 | { |
---|
[158] | 550 | unsigned int i; |
---|
| 551 | for (i = 0; format[i] && format[i] != '%'; i++) |
---|
| 552 | ; |
---|
[622] | 553 | if (i) |
---|
| 554 | { |
---|
| 555 | _tty_write( format, i, channel ); |
---|
[158] | 556 | format += i; |
---|
| 557 | } |
---|
[622] | 558 | if (*format == '%') |
---|
| 559 | { |
---|
[158] | 560 | format++; |
---|
| 561 | goto printf_arguments; |
---|
| 562 | } |
---|
| 563 | } // end while |
---|
| 564 | |
---|
[622] | 565 | va_end( ap ); |
---|
[158] | 566 | |
---|
[622] | 567 | // release lock |
---|
| 568 | _tty_release_lock( 0 ); |
---|
| 569 | |
---|
| 570 | return; |
---|
| 571 | |
---|
[158] | 572 | printf_arguments: |
---|
| 573 | |
---|
| 574 | { |
---|
[622] | 575 | int val = va_arg(ap, long); |
---|
| 576 | char buf[20]; |
---|
| 577 | char* pbuf; |
---|
[158] | 578 | unsigned int len = 0; |
---|
| 579 | static const char HexaTab[] = "0123456789ABCDEF"; |
---|
| 580 | unsigned int i; |
---|
| 581 | |
---|
| 582 | switch (*format++) { |
---|
| 583 | case ('c'): // char conversion |
---|
| 584 | len = 1; |
---|
| 585 | buf[0] = val; |
---|
| 586 | pbuf = buf; |
---|
| 587 | break; |
---|
| 588 | case ('d'): // decimal signed integer |
---|
[622] | 589 | if (val < 0) |
---|
| 590 | { |
---|
[158] | 591 | val = -val; |
---|
[622] | 592 | _tty_write( "_" , 1, channel ); |
---|
[158] | 593 | } |
---|
| 594 | case ('u'): // decimal unsigned integer |
---|
[622] | 595 | for( i=0 ; i<10 ; i++) |
---|
| 596 | { |
---|
[158] | 597 | buf[9-i] = HexaTab[val % 10]; |
---|
| 598 | if (!(val /= 10)) break; |
---|
| 599 | } |
---|
| 600 | len = i+1; |
---|
| 601 | pbuf = &buf[9-i]; |
---|
| 602 | break; |
---|
| 603 | case ('x'): // hexadecimal integer |
---|
[622] | 604 | _tty_write( "0x", 2, channel ); |
---|
| 605 | for( i=0 ; i<8 ; i++) |
---|
| 606 | { |
---|
[158] | 607 | buf[7-i] = HexaTab[val % 16U]; |
---|
| 608 | if (!(val /= 16U)) break; |
---|
| 609 | } |
---|
| 610 | len = i+1; |
---|
| 611 | pbuf = &buf[7-i]; |
---|
| 612 | break; |
---|
| 613 | case ('s'): // string |
---|
| 614 | { |
---|
| 615 | char *str = (char*)val; |
---|
| 616 | while ( str[len] ) len++; |
---|
| 617 | pbuf = (char*)val; |
---|
| 618 | } |
---|
| 619 | break; |
---|
| 620 | default: |
---|
| 621 | goto printf_text; |
---|
| 622 | } // end switch |
---|
| 623 | |
---|
[622] | 624 | _tty_write( pbuf, len, channel ); |
---|
[158] | 625 | goto printf_text; |
---|
| 626 | } |
---|
| 627 | } // end printf() |
---|
| 628 | |
---|
[622] | 629 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 630 | // These functions are the ISRs that must be executed when an IRQ is activated |
---|
| 631 | // by the TTY: _tty_isr_X is associated to channel [X]. |
---|
| 632 | // It save the character in the communication buffer _tty_get_buf[X], |
---|
| 633 | // and set the set/reset variable _tty_get_full[X]. |
---|
| 634 | // A character is lost if the buffer is full when the ISR is executed. |
---|
| 635 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 636 | in_drivers void _tty_isr_indexed(size_t index) |
---|
[158] | 637 | { |
---|
[622] | 638 | char* base = (char*)&seg_tty_base; |
---|
| 639 | char* tty_address = (char*)(base + index*TTY_SPAN*4); |
---|
| 640 | |
---|
| 641 | _tty_get_buf[index] = tty_address[TTY_READ*4]; // save character and reset IRQ |
---|
| 642 | _tty_get_full[index] = 1; // signals character available |
---|
[158] | 643 | } |
---|
[622] | 644 | |
---|
| 645 | in_drivers void _tty_isr_00() { _tty_isr_indexed(0); } |
---|
| 646 | in_drivers void _tty_isr_01() { _tty_isr_indexed(1); } |
---|
| 647 | in_drivers void _tty_isr_02() { _tty_isr_indexed(2); } |
---|
| 648 | in_drivers void _tty_isr_03() { _tty_isr_indexed(3); } |
---|
| 649 | in_drivers void _tty_isr_04() { _tty_isr_indexed(4); } |
---|
| 650 | in_drivers void _tty_isr_05() { _tty_isr_indexed(5); } |
---|
| 651 | in_drivers void _tty_isr_06() { _tty_isr_indexed(6); } |
---|
| 652 | in_drivers void _tty_isr_07() { _tty_isr_indexed(7); } |
---|
| 653 | in_drivers void _tty_isr_08() { _tty_isr_indexed(8); } |
---|
| 654 | in_drivers void _tty_isr_09() { _tty_isr_indexed(9); } |
---|
| 655 | in_drivers void _tty_isr_10() { _tty_isr_indexed(10); } |
---|
| 656 | in_drivers void _tty_isr_11() { _tty_isr_indexed(11); } |
---|
| 657 | in_drivers void _tty_isr_12() { _tty_isr_indexed(12); } |
---|
| 658 | in_drivers void _tty_isr_13() { _tty_isr_indexed(13); } |
---|
| 659 | in_drivers void _tty_isr_14() { _tty_isr_indexed(14); } |
---|
| 660 | in_drivers void _tty_isr_15() { _tty_isr_indexed(15); } |
---|
| 661 | in_drivers void _tty_isr_16() { _tty_isr_indexed(16); } |
---|
| 662 | in_drivers void _tty_isr_17() { _tty_isr_indexed(17); } |
---|
| 663 | in_drivers void _tty_isr_18() { _tty_isr_indexed(18); } |
---|
| 664 | in_drivers void _tty_isr_19() { _tty_isr_indexed(19); } |
---|
| 665 | in_drivers void _tty_isr_20() { _tty_isr_indexed(20); } |
---|
| 666 | in_drivers void _tty_isr_21() { _tty_isr_indexed(21); } |
---|
| 667 | in_drivers void _tty_isr_22() { _tty_isr_indexed(22); } |
---|
| 668 | in_drivers void _tty_isr_23() { _tty_isr_indexed(23); } |
---|
| 669 | in_drivers void _tty_isr_24() { _tty_isr_indexed(24); } |
---|
| 670 | in_drivers void _tty_isr_25() { _tty_isr_indexed(25); } |
---|
| 671 | in_drivers void _tty_isr_26() { _tty_isr_indexed(26); } |
---|
| 672 | in_drivers void _tty_isr_27() { _tty_isr_indexed(27); } |
---|
| 673 | in_drivers void _tty_isr_28() { _tty_isr_indexed(28); } |
---|
| 674 | in_drivers void _tty_isr_29() { _tty_isr_indexed(29); } |
---|
| 675 | in_drivers void _tty_isr_30() { _tty_isr_indexed(30); } |
---|
| 676 | in_drivers void _tty_isr_31() { _tty_isr_indexed(31); } |
---|
| 677 | |
---|
| 678 | |
---|
| 679 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 680 | // I/O BLOCK_DEVICE |
---|
| 681 | // The three functions below use the three variables _ioc_lock _ioc_done, |
---|
| 682 | // and _ioc_status for synchronisation. |
---|
| 683 | // - As the IOC component can be used by several programs running in parallel, |
---|
| 684 | // the _ioc_lock variable guaranties exclusive access to the device. |
---|
| 685 | // The _ioc_read() and _ioc_write() functions use atomic LL/SC to get the lock. |
---|
| 686 | // and set _ioc_lock to a non zero value. |
---|
| 687 | // The _ioc_write() and _ioc_read() functions are blocking, polling the _ioc_lock |
---|
| 688 | // variable until the device is available. |
---|
| 689 | // - When the tranfer is completed, the ISR routine activated by the IOC IRQ |
---|
| 690 | // set the _ioc_done variable to a non-zero value. Possible address errors detected |
---|
| 691 | // by the IOC peripheral are reported by the ISR in the _ioc_status variable. |
---|
| 692 | // The _ioc_completed() function is polling the _ioc_done variable, waiting for |
---|
| 693 | // tranfer conpletion. When the completion is signaled, the _ioc_completed() function |
---|
| 694 | // reset the _ioc_done variable to zero, and releases the _ioc_lock variable. |
---|
| 695 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 696 | // This blocking function is used by the _ioc_read() and _ioc_write() functions |
---|
| 697 | // to get _ioc_lock using LL/SC. |
---|
| 698 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 699 | in_drivers void _ioc_get_lock() |
---|
[158] | 700 | { |
---|
[622] | 701 | register unsigned int* plock = (unsigned int*)&_ioc_lock; |
---|
| 702 | |
---|
| 703 | asm volatile ("_ioc_llsc: \n" |
---|
| 704 | "ll $2, 0(%0) \n" // $2 <= _ioc_lock |
---|
| 705 | "bnez $2, _ioc_llsc \n" // retry if busy |
---|
| 706 | "li $3, 1 \n" // prepare argument for sc |
---|
| 707 | "sc $3, 0(%0) \n" // try to set _ioc_busy |
---|
| 708 | "beqz $3, _ioc_llsc \n" // retry if not atomic |
---|
| 709 | ::"r"(plock):"$2","$3"); |
---|
[158] | 710 | } |
---|
[622] | 711 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 712 | // Transfer data from a memory buffer to the block_device. |
---|
| 713 | // - lba : first block index on the disk |
---|
| 714 | // - buffer : base address of the memory buffer |
---|
| 715 | // - count : number of blocks to be transfered |
---|
| 716 | // The source buffer must be in user address space. |
---|
| 717 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 718 | in_drivers void _ioc_write( size_t lba, |
---|
| 719 | void* buffer, |
---|
| 720 | size_t count, |
---|
| 721 | size_t ext ) |
---|
[158] | 722 | { |
---|
[622] | 723 | volatile unsigned int* ioc_address = (unsigned int*)&seg_ioc_base; |
---|
| 724 | |
---|
| 725 | // get the lock |
---|
| 726 | _ioc_get_lock(); |
---|
| 727 | |
---|
| 728 | // block_device configuration |
---|
| 729 | ioc_address[BLOCK_DEVICE_BUFFER] = (unsigned int)buffer; |
---|
| 730 | ioc_address[BLOCK_DEVICE_BUFFER_EXT] = ext; |
---|
| 731 | ioc_address[BLOCK_DEVICE_COUNT] = count; |
---|
| 732 | ioc_address[BLOCK_DEVICE_LBA] = lba; |
---|
| 733 | ioc_address[BLOCK_DEVICE_IRQ_ENABLE] = 1; |
---|
| 734 | ioc_address[BLOCK_DEVICE_OP] = BLOCK_DEVICE_WRITE; |
---|
[158] | 735 | } |
---|
[622] | 736 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 737 | // Transfer data from a file on the block device to a memory buffer. |
---|
| 738 | // - lba : first block index on the disk |
---|
| 739 | // - buffer : base address of the memory buffer |
---|
| 740 | // - count : number of blocks to be transfered |
---|
| 741 | // The destination buffer must be in user address space. |
---|
| 742 | // All cache lines corresponding to the the target buffer must be invalidated |
---|
| 743 | // for cache coherence. |
---|
| 744 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 745 | in_drivers void _ioc_read( size_t lba, |
---|
| 746 | void* buffer, |
---|
| 747 | size_t count, |
---|
| 748 | size_t ext ) |
---|
[158] | 749 | { |
---|
[622] | 750 | volatile unsigned int* ioc_address = (unsigned int*)&seg_ioc_base; |
---|
[158] | 751 | |
---|
[622] | 752 | // get the lock |
---|
| 753 | _ioc_get_lock(); |
---|
| 754 | |
---|
| 755 | // block_device configuration |
---|
| 756 | ioc_address[BLOCK_DEVICE_BUFFER] = (unsigned int)buffer; |
---|
| 757 | ioc_address[BLOCK_DEVICE_BUFFER_EXT] = ext; |
---|
| 758 | ioc_address[BLOCK_DEVICE_COUNT] = count; |
---|
| 759 | ioc_address[BLOCK_DEVICE_LBA] = lba; |
---|
| 760 | ioc_address[BLOCK_DEVICE_IRQ_ENABLE] = 1; |
---|
| 761 | ioc_address[BLOCK_DEVICE_OP] = BLOCK_DEVICE_READ; |
---|
[158] | 762 | } |
---|
[622] | 763 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 764 | // This blocking function cheks completion of an I/O transfer and reports errors. |
---|
| 765 | // It returns 0 if the transfer is successfully completed. |
---|
| 766 | // It returns -1 if an error has been reported. |
---|
| 767 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 768 | in_drivers void _ioc_completed() |
---|
[158] | 769 | { |
---|
[622] | 770 | // waiting for completion |
---|
| 771 | while (_ioc_done == 0) asm volatile("nop"); |
---|
| 772 | |
---|
| 773 | // reset synchronisation variables |
---|
| 774 | _ioc_done = 0; |
---|
| 775 | _ioc_lock = 0; |
---|
| 776 | |
---|
| 777 | if( (_ioc_status != BLOCK_DEVICE_READ_SUCCESS) && |
---|
| 778 | (_ioc_status != BLOCK_DEVICE_WRITE_SUCCESS) ) |
---|
| 779 | { |
---|
| 780 | _tty_get_lock( 0 ); |
---|
| 781 | _tty_puts( "ERROR in _ioc_completed()\n"); |
---|
| 782 | _tty_release_lock( 0 ); |
---|
| 783 | _exit(); |
---|
| 784 | } |
---|
[158] | 785 | } |
---|
[622] | 786 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 787 | // This ISR must be executed when an IRQ is activated by IOC to signal completion. |
---|
| 788 | // It acknowledge the IRQ using the ioc base address, save the status in _ioc_status, |
---|
| 789 | // and set the _ioc_done variable to signal completion. |
---|
| 790 | // This variable is defined in the drivers.c file. |
---|
| 791 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 792 | in_drivers void _ioc_isr() |
---|
[158] | 793 | { |
---|
[622] | 794 | int* ioc_address = (int*)&seg_ioc_base; |
---|
| 795 | |
---|
| 796 | _ioc_status = ioc_address[BLOCK_DEVICE_STATUS]; // save status & reset IRQ |
---|
| 797 | _ioc_done = 1; // signals completion |
---|
[158] | 798 | } |
---|
[622] | 799 | |
---|
| 800 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 801 | // This ISR must be executed when an IRQ is activated by MEMC to signal |
---|
| 802 | // an error detected by the TSAR memory cache after a write transaction. |
---|
| 803 | // It displays an error message on the TTY terminal allocated to the processor |
---|
| 804 | // executing the ISR. |
---|
| 805 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 806 | in_drivers void _mmc_isr() |
---|
[158] | 807 | { |
---|
[622] | 808 | int* mmc_address = (int*)&seg_mmc_base; |
---|
| 809 | unsigned int cluster_xy = _procid() / NB_PROCS_MAX; |
---|
| 810 | |
---|
| 811 | _tty_printf( "WRITE ERROR signaled by Memory Cache in cluster %x\n", cluster_xy ); |
---|
[158] | 812 | } |
---|
[622] | 813 | |
---|
| 814 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 815 | // FRAME_BUFFER |
---|
| 816 | // The _fb_sync_write & _fb_sync_read functions use a memcpy strategy to implement |
---|
| 817 | // the transfer between a data buffer and the frame buffer. |
---|
| 818 | // They are blocking until completion of the transfer. |
---|
| 819 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 820 | // _fb_sync_write() |
---|
| 821 | // Transfer data from an user buffer to the frame_buffer device with a memcpy. |
---|
| 822 | // - offset : offset (in bytes) in the frame buffer |
---|
| 823 | // - buffer : base address of the memory buffer |
---|
| 824 | // - length : number of bytes to be transfered |
---|
| 825 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 826 | in_drivers void _fb_sync_write( size_t offset, |
---|
| 827 | void* buffer, |
---|
| 828 | size_t length, |
---|
| 829 | size_t ext ) |
---|
[158] | 830 | { |
---|
[622] | 831 | volatile char* fb = (char*)(void*)&seg_fbf_base + offset; |
---|
| 832 | char* ub = buffer; |
---|
[158] | 833 | |
---|
[622] | 834 | _memcpy( (void*)fb, (void*)ub, length ); |
---|
[158] | 835 | } |
---|
[622] | 836 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 837 | // _fb_sync_read() |
---|
| 838 | // Transfer data from the frame_buffer device to an user buffer with a memcpy. |
---|
| 839 | // - offset : offset (in bytes) in the frame buffer |
---|
| 840 | // - buffer : base address of the memory buffer |
---|
| 841 | // - length : number of bytes to be transfered |
---|
| 842 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 843 | in_drivers void _fb_sync_read( size_t offset, |
---|
| 844 | void* buffer, |
---|
| 845 | size_t length, |
---|
| 846 | size_t ext ) |
---|
[158] | 847 | { |
---|
[622] | 848 | volatile char* fb = (char*)(void*)&seg_fbf_base + offset; |
---|
| 849 | char* ub = buffer; |
---|
| 850 | |
---|
| 851 | _memcpy( (void*)ub, (void*)fb, length ); |
---|
[158] | 852 | } |
---|
[622] | 853 | |
---|
| 854 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 855 | // Release a software spin-lock |
---|
| 856 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 857 | in_drivers void _release_lock(size_t index) |
---|
| 858 | |
---|
[158] | 859 | { |
---|
[622] | 860 | if( index >= NB_LOCKS ) |
---|
| 861 | { |
---|
| 862 | _tty_get_lock( 0 ); |
---|
| 863 | _tty_puts( "ERROR in _release_lock()" ); |
---|
| 864 | _tty_release_lock( 0 ); |
---|
| 865 | _exit(); |
---|
| 866 | } |
---|
| 867 | |
---|
| 868 | _spin_lock[index] = 0; |
---|
[158] | 869 | } |
---|
[622] | 870 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 871 | // Try to take a software spin-lock. |
---|
| 872 | // This is a blocking call, as there is a busy-waiting loop, |
---|
| 873 | // until the lock is granted to the requester. |
---|
| 874 | // There is an internal delay of about 100 cycles between |
---|
| 875 | // two successive lock read, to avoid bus saturation. |
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| 876 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 877 | in_drivers void _get_lock(size_t index) |
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[158] | 878 | { |
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[622] | 879 | if( index >= NB_LOCKS ) |
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| 880 | { |
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| 881 | _tty_get_lock( 0 ); |
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| 882 | _tty_puts( "ERROR in _get_lock()" ); |
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| 883 | _tty_release_lock( 0 ); |
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| 884 | _exit(); |
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| 885 | } |
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[158] | 886 | |
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[622] | 887 | register int delay = ((_proctime() +_procid()) & 0xF) << 4; |
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| 888 | register int * plock = (int *) &_spin_lock[index]; |
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[158] | 889 | |
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[622] | 890 | asm volatile ("_locks_llsc: \n" |
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| 891 | "ll $2, 0(%0) \n" // $2 <= _locks_lock |
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| 892 | "bnez $2, _locks_delay \n" // random delay if busy |
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| 893 | "li $3, 1 \n" // prepare argument for sc |
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| 894 | "sc $3, 0(%0) \n" // try to set _locks_busy |
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| 895 | "bnez $3, _locks_ok \n" // exit if atomic |
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| 896 | "_locks_delay: \n" |
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| 897 | "move $4, %1 \n" // $4 <= delay |
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| 898 | "_locks_loop: \n" |
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| 899 | "addi $4, $4, -1 \n" // $4 <= $4 - 1 |
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| 900 | "beqz $4, _locks_loop \n" // test end delay |
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| 901 | "j _locks_llsc \n" // retry |
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| 902 | "_locks_ok: \n" |
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| 903 | ::"r"(plock),"r"(delay):"$2","$3","$4"); |
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[158] | 904 | } |
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| 905 | |
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[622] | 906 | |
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| 907 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 908 | // This function makes a cooperative initialisation of the barrier: |
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| 909 | // - barrier_count[index] <= N |
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| 910 | // - barrier_lock[index] <= 0 |
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| 911 | // All tasks try to initialize the barrier, but the initialisation |
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| 912 | // is done by only one task, using LL/SC instructions. |
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| 913 | // This cooperative initialisation is questionnable, |
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| 914 | // because the barrier can ony be initialised once... |
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| 915 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 916 | in_drivers void _barrier_init(unsigned int index, unsigned int value) |
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[158] | 917 | { |
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| 918 | |
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[622] | 919 | register int* pinit = (int*)&_barrier_value[index]; |
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| 920 | register int* pcount = (int*)&_barrier_count[index]; |
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| 921 | register int* plock = (int*)&_barrier_lock[index]; |
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| 922 | |
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| 923 | if ( index >= NB_BARRIERS ) |
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| 924 | { |
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| 925 | _tty_get_lock( 0 ); |
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| 926 | _tty_puts( "ERROR in _barrier_init()" ); |
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| 927 | _tty_release_lock( 0 ); |
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| 928 | _exit(); |
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| 929 | } |
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| 930 | |
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| 931 | // parallel initialisation using atomic instructions LL/SC |
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| 932 | asm volatile ("_barrier_init_test: \n" |
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| 933 | "ll $2, 0(%0) \n" // read barrier_value |
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| 934 | "bnez $2, _barrier_init_done \n" |
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| 935 | "move $3, %3 \n" |
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| 936 | "sc $3, 0(%0) \n" // try to write barrier_value |
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| 937 | "beqz $3, _barrier_init_test \n" |
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| 938 | "move $3, %3 \n" |
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| 939 | "sw $3, 0(%1) \n" // barrier_count <= barrier_value |
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| 940 | "move $3, $0 \n" // |
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| 941 | "sw $3, 0(%2) \n" // barrier_lock <= 0 |
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| 942 | "_barrier_init_done: \n" |
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| 943 | ::"r"(pinit),"r"(pcount),"r"(plock),"r"(value):"$2","$3"); |
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[158] | 944 | } |
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[622] | 945 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 946 | // This blocking function uses a busy_wait technics (on the barrier_lock value), |
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| 947 | // because the GIET does not support dynamic scheduling/descheduling of tasks. |
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| 948 | // The barrier state is actually defined by two variables: |
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| 949 | // _barrier_count[index] define the number of particpants that are waiting |
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| 950 | // _barrier_lock[index] define the bool variable whose value is polled |
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| 951 | // The last participant change the value of _barrier_lock[index] to release the barrier... |
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| 952 | // There is at most 16 independant barriers, and an error is returned |
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| 953 | // if the barrier index is larger than 15. |
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| 954 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 955 | in_drivers void _barrier_wait(unsigned int index) |
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[158] | 956 | { |
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[622] | 957 | register int* pcount = (int*)&_barrier_count[index]; |
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| 958 | register int count; |
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[158] | 959 | |
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[622] | 960 | int lock = _barrier_lock[index]; |
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| 961 | |
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| 962 | if ( index >= NB_BARRIERS ) |
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| 963 | { |
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| 964 | _tty_get_lock( 0 ); |
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| 965 | _tty_puts( "ERROR in _barrier_wait()" ); |
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| 966 | _tty_release_lock( 0 ); |
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| 967 | _exit(); |
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| 968 | } |
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| 969 | |
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| 970 | // parallel decrement _barrier_count[index] using atomic instructions LL/SC |
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| 971 | // input : pointer on _barrier_count[index] |
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| 972 | // output : count = _barrier_count[index] (before decrementation) |
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| 973 | asm volatile ("_barrier_decrement: \n" |
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| 974 | "ll %0, 0(%1) \n" |
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| 975 | "addi $3, %0, -1 \n" |
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| 976 | "sc $3, 0(%1) \n" |
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| 977 | "beqz $3, _barrier_decrement \n" |
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| 978 | :"=&r"(count) |
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| 979 | :"r"(pcount) |
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| 980 | :"$2","$3"); |
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| 981 | |
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| 982 | // the last task re-initializes the barrier_ count variable |
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| 983 | // and the barrier_lock variable, waking up all other waiting tasks |
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| 984 | |
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| 985 | if ( count == 1 ) // last task |
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| 986 | { |
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| 987 | _barrier_count[index] = _barrier_value[index]; |
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| 988 | asm volatile( "sync" ); |
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| 989 | _barrier_lock[index] = (lock == 0) ? 1 : 0; |
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| 990 | } |
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| 991 | else // other tasks |
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| 992 | { |
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| 993 | while ( lock == _barrier_lock[index] ) asm volatile("nop"); |
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| 994 | } |
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| 995 | } |
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| 996 | |
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| 997 | |
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[158] | 998 | // Local Variables: |
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| 999 | // tab-width: 4; |
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| 1000 | // c-basic-offset: 4; |
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| 1001 | // c-file-offsets:((innamespace . 0)(inline-open . 0)); |
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| 1002 | // indent-tabs-mode: nil; |
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| 1003 | // End: |
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| 1004 | // |
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| 1005 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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| 1006 | |
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