| 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 defines various 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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| 30 | |
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| 31 | #include "stdio.h" |
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| 32 | |
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| 33 | #if !defined(NB_PROCS_MAX) |
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| 34 | #error: you must define NB_PROCS_MAX in the hard_config.h file |
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| 35 | #endif |
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| 36 | |
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| 37 | #if !defined(X_IO) || !defined(Y_IO) |
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| 38 | #error: you must define X_IO and Y_IO in the hard_config.h file |
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| 39 | #endif |
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| 40 | |
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| 41 | #if !defined(X_SIZE) |
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| 42 | #error: you must define X_SIZE in the hard_config.h file |
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| 43 | #endif |
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| 44 | |
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| 45 | #if !defined(Y_SIZE) |
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| 46 | #error: you must define Y_SIZE in the hard_config.h file |
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| 47 | #endif |
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| 48 | |
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| 49 | #if !defined(X_WIDTH) |
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| 50 | #error: you must define X_WIDTH in the hard_config.h file |
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| 51 | #endif |
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| 52 | |
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| 53 | #if (X_WIDTH != 4) |
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| 54 | #error: The X_WIDTH parameter must be equal to 4 |
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| 55 | #endif |
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| 56 | |
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| 57 | #if !defined(Y_WIDTH) |
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| 58 | #error: you must define X_WIDTH in the hard_config.h file |
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| 59 | #endif |
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| 60 | |
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| 61 | #if (X_WIDTH != 4) |
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| 62 | #error: The Y_WIDTH parameter must be equal to 4 |
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| 63 | #endif |
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| 64 | |
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| 65 | #if !defined(NB_TTY_CHANNELS) |
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| 66 | #error: you must define NB_TTY_CHANNELS in the hard_config.h file |
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| 67 | #endif |
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| 68 | |
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| 69 | #define NB_LOCKS 256 |
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| 70 | #define NB_BARRIERS 16 |
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| 71 | |
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| 72 | #define in_drivers __attribute__((section (".drivers"))) |
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| 73 | #define in_unckdata __attribute__((section (".unckdata"))) |
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| 74 | #define cacheline_aligned __attribute__((aligned(64))) |
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| 75 | |
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| 76 | ////////////////////////////////////////////////////////////// |
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| 77 | // various informations that must be defined in ldscript |
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| 78 | ////////////////////////////////////////////////////////////// |
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| 79 | |
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| 80 | struct plouf; |
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| 81 | extern volatile struct plouf seg_tty_base; |
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| 82 | extern volatile struct plouf seg_fbf_base; |
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| 83 | extern volatile struct plouf seg_ioc_base; |
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| 84 | extern volatile struct plouf seg_mmc_base; |
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| 85 | extern volatile struct plouf seg_ramdisk_base; |
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| 86 | |
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| 87 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 88 | // Global uncachable variables for synchronization between drivers and ISRs |
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| 89 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 90 | |
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| 91 | static in_unckdata int volatile _ioc_lock = 0; |
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| 92 | static in_unckdata int volatile _ioc_done = 0; |
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| 93 | static in_unckdata int volatile _ioc_status; |
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| 94 | |
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| 95 | static volatile in_unckdata struct cacheline_aligned { |
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| 96 | int lock; |
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| 97 | int get_full; |
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| 98 | char get_buf; |
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| 99 | char __padding[55]; |
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| 100 | } _tty_channel[NB_TTY_CHANNELS]; |
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| 101 | |
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| 102 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 103 | // Global uncachable variables for inter-task barriers |
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| 104 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 105 | |
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| 106 | static in_unckdata int volatile _barrier_value[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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| 107 | static in_unckdata int volatile _barrier_count[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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| 108 | static in_unckdata int volatile _barrier_lock[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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| 109 | |
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| 110 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 111 | // Global uncachable variables for spin_locks using LL/C instructions |
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| 112 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 113 | |
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| 114 | static in_unckdata int volatile _spin_lock[NB_LOCKS] = { [0 ... NB_LOCKS-1] = 0 }; |
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| 115 | |
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| 116 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 117 | // Memcopy taken from MutekH. |
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| 118 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 119 | in_drivers void* _memcpy( void* _dst, |
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| 120 | const void* _src, |
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| 121 | unsigned int size ) |
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| 122 | { |
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| 123 | unsigned int *dst = _dst; |
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| 124 | const unsigned int *src = _src; |
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| 125 | if ( ! ((unsigned int)dst & 3) && ! ((unsigned int)src & 3) ) |
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| 126 | { |
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| 127 | while (size > 3) |
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| 128 | { |
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| 129 | *dst++ = *src++; |
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| 130 | size -= 4; |
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| 131 | } |
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| 132 | } |
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| 133 | |
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| 134 | unsigned char *cdst = (unsigned char*)dst; |
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| 135 | unsigned char *csrc = (unsigned char*)src; |
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| 136 | |
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| 137 | while (size--) |
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| 138 | { |
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| 139 | *cdst++ = *csrc++; |
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| 140 | } |
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| 141 | return _dst; |
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| 142 | } |
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| 143 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 144 | // Memcopy using extended addresses |
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| 145 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 146 | in_drivers void _extended_memcpy( unsigned int dst_cluster, |
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| 147 | unsigned int dst_address, |
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| 148 | unsigned int src_cluster, |
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| 149 | unsigned int src_address, |
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| 150 | unsigned int length ) |
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| 151 | { |
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| 152 | if ( (dst_address & 0x3) || (src_address & 0x3) || (length & 0x3) ) |
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| 153 | { |
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| 154 | _tty_get_lock( 0 ); |
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| 155 | _tty_puts( "ERROR in _extended_memcpy()" ); |
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| 156 | _tty_release_lock( 0 ); |
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| 157 | _exit(); |
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| 158 | } |
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| 159 | |
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| 160 | unsigned int i; |
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| 161 | unsigned int word; |
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| 162 | |
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| 163 | for ( i = 0 ; i < length ; i = i+4 ) |
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| 164 | { |
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| 165 | word = _word_extended_read( src_cluster, src_address + i ); |
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| 166 | _word_extended_write( dst_cluster, dst_address + i, word ); |
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| 167 | } |
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| 168 | } |
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| 169 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 170 | // Access CP0 and returns processor ident |
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| 171 | // No more than 1024 processors... |
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| 172 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 173 | in_drivers unsigned int _procid() |
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| 174 | { |
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| 175 | unsigned int ret; |
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| 176 | asm volatile( "mfc0 %0, $15, 1": "=r"(ret) ); |
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| 177 | return (ret & 0x3FF); |
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| 178 | } |
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| 179 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 180 | // Access CP0 and returns processor time |
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| 181 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 182 | in_drivers unsigned int _proctime() |
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| 183 | { |
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| 184 | unsigned int ret; |
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| 185 | asm volatile( "mfc0 %0, $9": "=r"(ret) ); |
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| 186 | return ret; |
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| 187 | } |
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| 188 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 189 | // Returns the number of processsors controled by the GIET |
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| 190 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 191 | in_drivers inline unsigned int _procnumber() |
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| 192 | { |
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| 193 | return (unsigned int)(NB_PROCS_MAX * X_SIZE * Y_SIZE); |
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| 194 | } |
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| 195 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 196 | // Returns pseudo-random number |
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| 197 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 198 | in_drivers unsigned int _rand() |
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| 199 | { |
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| 200 | unsigned int x = _proctime(); |
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| 201 | if((x & 0xF) > 7) |
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| 202 | return (x*x & 0xFFFF); |
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| 203 | else |
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| 204 | return (x*x*x & 0xFFFF); |
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| 205 | } |
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| 206 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 207 | // Access CP0 and enable IRQs |
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| 208 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 209 | in_drivers inline void _it_enable() |
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| 210 | { |
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| 211 | asm volatile( |
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| 212 | "mfc0 $8, $12 \n" |
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| 213 | "ori $8, $8, 1 \n" |
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| 214 | "mtc0 $8, $12 \n" |
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| 215 | ::: "$8"); |
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| 216 | } |
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| 217 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 218 | // Access CP0 and mask IRQs |
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| 219 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 220 | in_drivers inline void _it_disable() |
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| 221 | { |
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| 222 | asm volatile( |
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| 223 | "li $9, 0xFFFFFFFE \n" |
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| 224 | "mfc0 $8, $12 \n" |
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| 225 | "and $8, $8, $9 \n" |
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| 226 | "mtc0 $8, $12 \n" |
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| 227 | ::: "$8","$9"); |
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| 228 | } |
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| 229 | |
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| 230 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 231 | // Access CP0 and mask IRQs |
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| 232 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 233 | in_drivers inline void _sr_write(int sr) |
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| 234 | { |
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| 235 | asm volatile("mtc0 %0, $12 \n" : /* no outputs */ : "r" (sr)); |
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| 236 | } |
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| 237 | |
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| 238 | in_drivers inline int _sr_read() |
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| 239 | { |
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| 240 | int ret; |
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| 241 | asm volatile("mfc0 %0, $12 \n" : "=r" (ret)); |
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| 242 | return ret; |
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| 243 | } |
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| 244 | |
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| 245 | ////////////////////////////////////////////////////////////////////// |
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| 246 | // Invalidate all cache lines corresponding to a memory buffer. |
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| 247 | // This is used by the block_device driver. |
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| 248 | ///////////////////////////////////////////////////////////////////////// |
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| 249 | in_drivers void _dcache_buf_invalidate(const void * buffer, size_t size) |
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| 250 | { |
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| 251 | size_t i; |
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| 252 | size_t dcache_line_size; |
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| 253 | |
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| 254 | // retrieve dcache line size from config register (bits 12:10) |
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| 255 | asm volatile("mfc0 %0, $16, 1" : "=r" (dcache_line_size)); |
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| 256 | |
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| 257 | dcache_line_size = 2 << ((dcache_line_size>>10) & 0x7); |
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| 258 | |
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| 259 | // iterate on lines to invalidate each one of them |
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| 260 | for ( i=0; i<size; i+=dcache_line_size ) |
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| 261 | asm volatile(" cache %0, %1" |
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| 262 | : |
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| 263 | :"i" (0x11), "R" (*((char*)buffer+i))); |
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| 264 | } |
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| 265 | |
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| 266 | //////////////////////////////////////////////////////////////////////////// |
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| 267 | // This function makes a physical read access to a 32 bits word in memory, |
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| 268 | // after a temporary paddr extension. |
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| 269 | //////////////////////////////////////////////////////////////////////////// |
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| 270 | in_drivers volatile unsigned int _word_extended_read( unsigned int cluster, |
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| 271 | unsigned int address ) |
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| 272 | { |
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| 273 | int sr = _sr_read(); |
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| 274 | volatile unsigned int value; |
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| 275 | asm volatile( |
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| 276 | "li $3, 0xFFFFFFFE \n" |
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| 277 | "and $3, %3, $3 \n" |
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| 278 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
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| 279 | |
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| 280 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
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| 281 | "lw %0, 0(%1) \n" /* value <= *paddr */ |
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| 282 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
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| 283 | |
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| 284 | : "=r" (value) |
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| 285 | : "r" (address), "r" (cluster), "r" (sr) |
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| 286 | : "$2", "$3", "memory" ); |
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| 287 | |
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| 288 | _sr_write(sr); |
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| 289 | return value; |
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| 290 | } |
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| 291 | //////////////////////////////////////////////////////////////////////////// |
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| 292 | // This function makes a physical read access to a single byte in memory, |
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| 293 | // after a temporary paddr extension. |
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| 294 | //////////////////////////////////////////////////////////////////////////// |
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| 295 | in_drivers volatile unsigned char _byte_extended_read( unsigned int cluster, |
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| 296 | unsigned int address ) |
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| 297 | { |
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| 298 | int sr = _sr_read(); |
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| 299 | volatile unsigned char value; |
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| 300 | asm volatile( |
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| 301 | "li $3, 0xFFFFFFFE \n" |
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| 302 | "and $3, %3, $3 \n" |
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| 303 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
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| 304 | |
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| 305 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
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| 306 | "lb %0, 0(%1) \n" /* value <= *paddr */ |
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| 307 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
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| 308 | |
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| 309 | : "=r" (value) |
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| 310 | : "r" (address), "r" (cluster), "r" (sr) |
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| 311 | : "$2", "$3", "memory" ); |
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| 312 | |
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| 313 | _sr_write(sr); |
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| 314 | return value; |
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| 315 | } |
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| 316 | //////////////////////////////////////////////////////////////////////////// |
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| 317 | // This function makes a physical write access to a 32 bits word in memory, |
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| 318 | // after a temporary DTLB address extension. |
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| 319 | //////////////////////////////////////////////////////////////////////////// |
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| 320 | in_drivers void _word_extended_write( unsigned int cluster, |
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| 321 | unsigned int address, |
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| 322 | unsigned int word ) |
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| 323 | { |
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| 324 | int sr = _sr_read(); |
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| 325 | asm volatile( |
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| 326 | "li $3, 0xFFFFFFFE \n" |
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| 327 | "and $3, %3, $3 \n" |
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| 328 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
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| 329 | |
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| 330 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
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| 331 | "sw %0, 0(%1) \n" /* *paddr <= value */ |
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| 332 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
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| 333 | |
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| 334 | "sync \n" |
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| 335 | : |
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| 336 | : "r" (word), "r" (address), "r" (cluster), "r" (sr) |
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| 337 | : "$2", "$3", "memory"); |
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| 338 | |
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| 339 | _sr_write(sr); |
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| 340 | } |
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| 341 | //////////////////////////////////////////////////////////////////////////// |
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| 342 | // This function makes a physical write access to single byte in memory, |
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| 343 | // after a temporary DTLB de-activation and address extension. |
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| 344 | //////////////////////////////////////////////////////////////////////////// |
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| 345 | in_drivers void _byte_extended_write( unsigned int cluster, |
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| 346 | unsigned int address, |
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| 347 | unsigned char byte ) |
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| 348 | { |
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| 349 | int sr = _sr_read(); |
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| 350 | asm volatile( |
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| 351 | "li $3, 0xFFFFFFFE \n" |
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| 352 | "and $3, %3, $3 \n" |
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| 353 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
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| 354 | |
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| 355 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
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| 356 | "sb %0, 0(%1) \n" /* *paddr <= value */ |
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| 357 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
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| 358 | |
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| 359 | "sync \n" |
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| 360 | : |
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| 361 | : "r" (byte), "r" (address), "r" (cluster), "r" (sr) |
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| 362 | : "$2", "$3", "memory"); |
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| 363 | |
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| 364 | _sr_write(sr); |
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| 365 | } |
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| 366 | |
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| 367 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 368 | // Exit (suicide) after printing message on TTY0 |
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| 369 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 370 | in_drivers void _exit() |
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| 371 | { |
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| 372 | unsigned int proc_id = _procid(); |
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| 373 | unsigned int l = proc_id % NB_PROCS_MAX; |
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| 374 | unsigned int x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
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| 375 | unsigned int y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
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| 376 | |
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| 377 | _tty_get_lock( 0 ); |
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| 378 | _tty_puts("\n !!! exit proc["); |
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| 379 | _tty_putd( x ); |
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| 380 | _tty_puts(","); |
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| 381 | _tty_putd( y ); |
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| 382 | _tty_puts(","); |
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| 383 | _tty_putd( l ); |
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| 384 | _tty_puts("] !!!\n"); |
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| 385 | _tty_release_lock( 0 ); |
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| 386 | |
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| 387 | while(1) asm volatile("nop"); // infinite loop... |
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| 388 | } |
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| 389 | |
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| 390 | ///////////////////////////////////////////////////////////////////////// |
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| 391 | // convert a 32 bits unsigned int to a string of 10 decimal characters. |
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| 392 | ///////////////////////////////////////////////////////////////////////// |
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| 393 | in_drivers void _itoa_dec(unsigned val, char* buf) |
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| 394 | { |
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| 395 | const char DecTab[] = "0123456789"; |
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| 396 | unsigned int i; |
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| 397 | for( i=0 ; i<10 ; i++ ) |
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| 398 | { |
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| 399 | if( (val!=0) || (i==0) ) buf[9-i] = DecTab[val % 10]; |
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| 400 | else buf[9-i] = 0x20; |
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| 401 | val /= 10; |
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| 402 | } |
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| 403 | } |
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| 404 | ////////////////////////////////////////////////////////////////////////// |
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| 405 | // convert a 32 bits unsigned int to a string of 8 hexadecimal characters. |
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| 406 | /////////////////////////////////////////////////////////////////////////// |
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| 407 | in_drivers void _itoa_hex(unsigned int val, char* buf) |
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| 408 | { |
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| 409 | const char HexaTab[] = "0123456789ABCD"; |
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| 410 | unsigned int i; |
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| 411 | for( i=0 ; i<8 ; i++ ) |
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| 412 | { |
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| 413 | buf[7-i] = HexaTab[val % 16]; |
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| 414 | val /= 16; |
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| 415 | } |
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| 416 | } |
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| 417 | |
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| 418 | |
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| 419 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 420 | // VCI MULTI_TTY |
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| 421 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 422 | // The total number of TTY terminals is defined by NB_TTY_CHANNELS. |
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| 423 | // - If there is only one terminal, it is supposed to be shared, and used by |
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| 424 | // all processors: a lock must be taken before display. |
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| 425 | // - If there is several terminals, and the number of processors is smaller |
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| 426 | // than the number of terminals, there is one terminal per processor, but |
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| 427 | // the TTY index is not equal to the proc_id, due to cluster indexing policy: |
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| 428 | // proc_id = cluster_xy * NB_PROCS_MAX + local_id (with cluster_xy = x << Y_WIDTH + y) |
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| 429 | // tty_id = cluster_id * NB_PROCS_MAX + local_id (with cluster_id = x * Y_SIZE + y) |
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| 430 | // - If the computed tty_id is larger than NB_TTY_CHANNELS, an error is returned. |
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| 431 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 432 | |
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| 433 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 434 | // Write one or several characters directly from a fixed length user buffer |
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| 435 | // to the TTY_WRITE register of the TTY controler. |
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| 436 | // The channel index must be checked by the calling function. |
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| 437 | // This is a non blocking call : it test the TTY_STATUS register. |
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| 438 | // If the TTY_STATUS_WRITE bit is set, the transfer stops and the function |
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| 439 | // returns the number of characters that have been actually written. |
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| 440 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 441 | in_drivers int _tty_write( char* buffer, |
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| 442 | unsigned int length, |
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| 443 | unsigned int channel ) |
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| 444 | { |
|---|
| 445 | unsigned int base = (unsigned int)&seg_tty_base + channel*TTY_SPAN*4; |
|---|
| 446 | unsigned int nwritten = 0; |
|---|
| 447 | unsigned int status; |
|---|
| 448 | unsigned int i; |
|---|
| 449 | |
|---|
| 450 | for ( i=0 ; i < length ; i++ ) |
|---|
| 451 | { |
|---|
| 452 | status = _word_extended_read( CLUSTER_IO, base + TTY_STATUS*4 ); |
|---|
| 453 | if ( (status & 0x2) == 0x2 ) break; |
|---|
| 454 | else |
|---|
| 455 | { |
|---|
| 456 | _byte_extended_write( CLUSTER_IO, base + TTY_WRITE*4 , buffer[i] ); |
|---|
| 457 | nwritten++; |
|---|
| 458 | } |
|---|
| 459 | } |
|---|
| 460 | |
|---|
| 461 | return nwritten; |
|---|
| 462 | } |
|---|
| 463 | |
|---|
| 464 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 465 | // Fetch one character directly from the TTY_READ register of the TTY controler, |
|---|
| 466 | // and writes this character to the user buffer. |
|---|
| 467 | // The channel index must be checked by the calling function. |
|---|
| 468 | // This is a non blocking call : it returns 0 if the register is empty, |
|---|
| 469 | // and returns 1 if the register is full. |
|---|
| 470 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 471 | in_drivers int _tty_read( char* buffer, |
|---|
| 472 | unsigned int channel ) |
|---|
| 473 | { |
|---|
| 474 | unsigned int base = (unsigned int)&seg_tty_base + channel*TTY_SPAN*4; |
|---|
| 475 | unsigned int status; |
|---|
| 476 | |
|---|
| 477 | status = _word_extended_read( CLUSTER_IO, base + TTY_STATUS*4 ); |
|---|
| 478 | if ( (status & 0x1) == 0x1 ) |
|---|
| 479 | { |
|---|
| 480 | buffer[0] = (char)_word_extended_read( CLUSTER_IO, base + TTY_READ*4 ); |
|---|
| 481 | return 1; |
|---|
| 482 | } |
|---|
| 483 | return 0; |
|---|
| 484 | } |
|---|
| 485 | |
|---|
| 486 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 487 | // This function displays a string on TTY0. |
|---|
| 488 | // The string must be terminated by a NUL character. |
|---|
| 489 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 490 | in_drivers void _tty_puts( char* string ) |
|---|
| 491 | { |
|---|
| 492 | int length = 0; |
|---|
| 493 | while (string[length] != 0) length++; |
|---|
| 494 | _tty_write( string, length, 0 ); |
|---|
| 495 | } |
|---|
| 496 | |
|---|
| 497 | /////////////////////////////////////////////////////////////////////////////// |
|---|
| 498 | // This function displays a 32 bits unsigned int as an hexa string on TTY0. |
|---|
| 499 | /////////////////////////////////////////////////////////////////////////////// |
|---|
| 500 | in_drivers void _tty_putx(unsigned int val) |
|---|
| 501 | { |
|---|
| 502 | static const char HexaTab[] = "0123456789ABCDEF"; |
|---|
| 503 | char buf[11]; |
|---|
| 504 | unsigned int c; |
|---|
| 505 | |
|---|
| 506 | buf[0] = '0'; |
|---|
| 507 | buf[1] = 'x'; |
|---|
| 508 | buf[10] = 0; |
|---|
| 509 | |
|---|
| 510 | for (c = 0; c < 8; c++) |
|---|
| 511 | { |
|---|
| 512 | buf[9 - c] = HexaTab[val & 0xF]; |
|---|
| 513 | val = val >> 4; |
|---|
| 514 | } |
|---|
| 515 | _tty_puts( buf ); |
|---|
| 516 | } |
|---|
| 517 | |
|---|
| 518 | /////////////////////////////////////////////////////////////////////////////// |
|---|
| 519 | // This function displays a 32 bits unsigned int as a decimal string on TTY0. |
|---|
| 520 | /////////////////////////////////////////////////////////////////////////////// |
|---|
| 521 | in_drivers void _tty_putd( unsigned int val ) |
|---|
| 522 | { |
|---|
| 523 | static const char DecTab[] = "0123456789"; |
|---|
| 524 | char buf[11]; |
|---|
| 525 | unsigned int i; |
|---|
| 526 | unsigned int first = 0; |
|---|
| 527 | |
|---|
| 528 | buf[10] = 0; |
|---|
| 529 | |
|---|
| 530 | for (i = 0; i < 10; i++) |
|---|
| 531 | { |
|---|
| 532 | if ((val != 0) || (i == 0)) |
|---|
| 533 | { |
|---|
| 534 | buf[9 - i] = DecTab[val % 10]; |
|---|
| 535 | first = 9 - i; |
|---|
| 536 | } |
|---|
| 537 | else |
|---|
| 538 | { |
|---|
| 539 | break; |
|---|
| 540 | } |
|---|
| 541 | val /= 10; |
|---|
| 542 | } |
|---|
| 543 | _tty_puts( &buf[first] ); |
|---|
| 544 | } |
|---|
| 545 | |
|---|
| 546 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 547 | // This function try to take the hardwired lock protecting exclusive access |
|---|
| 548 | // to TTY terminal identified by the channel argument. |
|---|
| 549 | // It returns only when the lock has been successfully taken. |
|---|
| 550 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 551 | in_drivers void _tty_get_lock( unsigned int channel ) |
|---|
| 552 | { |
|---|
| 553 | register unsigned int* plock = (unsigned int*)&_tty_channel[channel].lock; |
|---|
| 554 | |
|---|
| 555 | asm volatile ( |
|---|
| 556 | "1: \n" |
|---|
| 557 | "ll $2, 0(%0) \n" // $2 <= _tty_lock |
|---|
| 558 | "bnez $2, 1b \n" // retry if busy |
|---|
| 559 | "li $3, 1 \n" // prepare argument for sc |
|---|
| 560 | "sc $3, 0(%0) \n" // try to set _tty_busy |
|---|
| 561 | "beqz $3, 1b \n" // retry if not atomic |
|---|
| 562 | ::"r"(plock) :"$2","$3"); |
|---|
| 563 | } |
|---|
| 564 | |
|---|
| 565 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 566 | // This function releases the hardwired lock protecting exclusive access |
|---|
| 567 | // to TTY terminal identified by the channel argument. |
|---|
| 568 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 569 | in_drivers void _tty_release_lock( unsigned int channel ) |
|---|
| 570 | { |
|---|
| 571 | _tty_channel[channel].lock = 0; |
|---|
| 572 | } |
|---|
| 573 | |
|---|
| 574 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 575 | // This function fetch a single ascii character from a terminal |
|---|
| 576 | // implicitely defined by the processor ID. |
|---|
| 577 | // It is a blocking function. |
|---|
| 578 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 579 | in_drivers void _tty_getc( char* buf ) |
|---|
| 580 | { |
|---|
| 581 | unsigned int proc_id = _procid(); |
|---|
| 582 | unsigned int channel; |
|---|
| 583 | unsigned int l; |
|---|
| 584 | unsigned int x; |
|---|
| 585 | unsigned int y; |
|---|
| 586 | |
|---|
| 587 | // check TTY channel |
|---|
| 588 | l = (proc_id % NB_PROCS_MAX); |
|---|
| 589 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
|---|
| 590 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
|---|
| 591 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
|---|
| 592 | if (channel >= NB_TTY_CHANNELS ) |
|---|
| 593 | { |
|---|
| 594 | _tty_get_lock( 0 ); |
|---|
| 595 | _tty_puts( "ERROR in _tty_getc(): TTY index too large\n" ); |
|---|
| 596 | _tty_release_lock( 0 ); |
|---|
| 597 | _exit(); |
|---|
| 598 | } |
|---|
| 599 | |
|---|
| 600 | while( _tty_read( buf, channel ) == 0 ) asm volatile("nop"); |
|---|
| 601 | } |
|---|
| 602 | |
|---|
| 603 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 604 | // Fetch a string of decimal characters (most significant digit first) |
|---|
| 605 | // to build a 32 bits unsigned int. |
|---|
| 606 | // The terminal index is implicitely defined by the processor ID. |
|---|
| 607 | // This is a blocking function. |
|---|
| 608 | // The decimal characters are written in a 32 characters buffer |
|---|
| 609 | // until a <LF> or <CR> character is read. |
|---|
| 610 | // The <DEL> character is interpreted, and previous characters can be |
|---|
| 611 | // cancelled. All others characters are ignored. |
|---|
| 612 | // When the <LF> or <CR> character is received, the string is converted |
|---|
| 613 | // to an unsigned int value. If the number of decimal digit is too large |
|---|
| 614 | // for the 32 bits range, the zero value is returned. |
|---|
| 615 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 616 | in_drivers void _tty_getw( unsigned int* word_buffer ) |
|---|
| 617 | { |
|---|
| 618 | char buf[32]; |
|---|
| 619 | char byte; |
|---|
| 620 | char cancel_string[3] = { 0x08, 0x20, 0x08 }; |
|---|
| 621 | char zero = 0x30; |
|---|
| 622 | unsigned int save = 0; |
|---|
| 623 | unsigned int val = 0; |
|---|
| 624 | unsigned int done = 0; |
|---|
| 625 | unsigned int overflow = 0; |
|---|
| 626 | unsigned int max = 0; |
|---|
| 627 | unsigned int proc_id = _procid(); |
|---|
| 628 | unsigned int i; |
|---|
| 629 | unsigned int channel; |
|---|
| 630 | unsigned int x; |
|---|
| 631 | unsigned int y; |
|---|
| 632 | unsigned int l; |
|---|
| 633 | |
|---|
| 634 | // check TTY channel |
|---|
| 635 | l = (proc_id % NB_PROCS_MAX); |
|---|
| 636 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
|---|
| 637 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
|---|
| 638 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
|---|
| 639 | if (channel >= NB_TTY_CHANNELS ) |
|---|
| 640 | { |
|---|
| 641 | _tty_get_lock( 0 ); |
|---|
| 642 | _tty_puts( "ERROR in _tty_getw(): TTY index too large\n" ); |
|---|
| 643 | _tty_release_lock( 0 ); |
|---|
| 644 | _exit(); |
|---|
| 645 | } |
|---|
| 646 | |
|---|
| 647 | while( done == 0 ) |
|---|
| 648 | { |
|---|
| 649 | _tty_read( &byte, channel ); |
|---|
| 650 | |
|---|
| 651 | if (( byte > 0x2F) && (byte < 0x3A)) // decimal character |
|---|
| 652 | { |
|---|
| 653 | buf[max] = byte; |
|---|
| 654 | max++; |
|---|
| 655 | _tty_write( &byte, 1, channel ); |
|---|
| 656 | } |
|---|
| 657 | else if ( (byte == 0x0A) || (byte == 0x0D) ) // LF or CR character |
|---|
| 658 | { |
|---|
| 659 | done = 1; |
|---|
| 660 | } |
|---|
| 661 | else if ( byte == 0x7F ) // DEL character |
|---|
| 662 | { |
|---|
| 663 | if (max > 0) |
|---|
| 664 | { |
|---|
| 665 | max--; // cancel the character |
|---|
| 666 | _tty_write( cancel_string, 3, channel ); |
|---|
| 667 | } |
|---|
| 668 | } |
|---|
| 669 | } // end while |
|---|
| 670 | |
|---|
| 671 | // string conversion |
|---|
| 672 | for( i=0 ; i<max ; i++ ) |
|---|
| 673 | { |
|---|
| 674 | val = val*10 + (buf[i] - 0x30); |
|---|
| 675 | if (val < save) overflow = 1; |
|---|
| 676 | save = val; |
|---|
| 677 | } |
|---|
| 678 | if (overflow == 0) |
|---|
| 679 | { |
|---|
| 680 | *word_buffer = val; // return decimal value |
|---|
| 681 | } |
|---|
| 682 | else |
|---|
| 683 | { |
|---|
| 684 | for( i=0 ; i<max ; i++) // cancel the string |
|---|
| 685 | { |
|---|
| 686 | _tty_write( cancel_string, 3, channel ); |
|---|
| 687 | } |
|---|
| 688 | _tty_write( &zero, 1, channel ); |
|---|
| 689 | *word_buffer = 0; // return 0 value |
|---|
| 690 | } |
|---|
| 691 | } |
|---|
| 692 | |
|---|
| 693 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 694 | // This function is a simplified version of the mutek_printf() function. |
|---|
| 695 | // It takes the TTY lock on the selected channel for exclusive access. |
|---|
| 696 | // Only a limited number of formats are supported: |
|---|
| 697 | // - %d : signed decimal |
|---|
| 698 | // - %u : unsigned decimal |
|---|
| 699 | // - %x : hexadecimal |
|---|
| 700 | // - %c : char |
|---|
| 701 | // - %s : string |
|---|
| 702 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 703 | in_drivers void _tty_printf( char *format, ...) |
|---|
| 704 | { |
|---|
| 705 | va_list ap; |
|---|
| 706 | va_start( ap, format ); |
|---|
| 707 | |
|---|
| 708 | unsigned int channel; |
|---|
| 709 | unsigned int x; |
|---|
| 710 | unsigned int y; |
|---|
| 711 | unsigned int proc_id = _procid(); |
|---|
| 712 | |
|---|
| 713 | // compute TTY channel : |
|---|
| 714 | // if the number of TTY channels is smaller |
|---|
| 715 | // than the number of clusters, use TTY_0_0 |
|---|
| 716 | // else, TTY channel <= cluster index |
|---|
| 717 | if ( NB_TTY_CHANNELS < (X_SIZE * Y_SIZE) ) |
|---|
| 718 | { |
|---|
| 719 | channel = 0; |
|---|
| 720 | } |
|---|
| 721 | else |
|---|
| 722 | { |
|---|
| 723 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
|---|
| 724 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
|---|
| 725 | channel = (x * Y_SIZE + y); |
|---|
| 726 | } |
|---|
| 727 | |
|---|
| 728 | // take the TTY lock |
|---|
| 729 | _tty_get_lock( channel ); |
|---|
| 730 | |
|---|
| 731 | printf_text: |
|---|
| 732 | |
|---|
| 733 | while (*format) |
|---|
| 734 | { |
|---|
| 735 | unsigned int i; |
|---|
| 736 | for (i = 0; format[i] && format[i] != '%'; i++) |
|---|
| 737 | ; |
|---|
| 738 | if (i) |
|---|
| 739 | { |
|---|
| 740 | _tty_write( format, i, channel ); |
|---|
| 741 | format += i; |
|---|
| 742 | } |
|---|
| 743 | if (*format == '%') |
|---|
| 744 | { |
|---|
| 745 | format++; |
|---|
| 746 | goto printf_arguments; |
|---|
| 747 | } |
|---|
| 748 | } // end while |
|---|
| 749 | |
|---|
| 750 | va_end( ap ); |
|---|
| 751 | |
|---|
| 752 | // release lock |
|---|
| 753 | _tty_release_lock( 0 ); |
|---|
| 754 | |
|---|
| 755 | return; |
|---|
| 756 | |
|---|
| 757 | printf_arguments: |
|---|
| 758 | |
|---|
| 759 | { |
|---|
| 760 | int val = va_arg(ap, long); |
|---|
| 761 | char buf[20]; |
|---|
| 762 | char* pbuf; |
|---|
| 763 | unsigned int len = 0; |
|---|
| 764 | static const char HexaTab[] = "0123456789ABCDEF"; |
|---|
| 765 | unsigned int i; |
|---|
| 766 | |
|---|
| 767 | switch (*format++) { |
|---|
| 768 | case ('c'): // char conversion |
|---|
| 769 | len = 1; |
|---|
| 770 | buf[0] = val; |
|---|
| 771 | pbuf = buf; |
|---|
| 772 | break; |
|---|
| 773 | case ('d'): // decimal signed integer |
|---|
| 774 | if (val < 0) |
|---|
| 775 | { |
|---|
| 776 | val = -val; |
|---|
| 777 | _tty_write( "_" , 1, channel ); |
|---|
| 778 | } |
|---|
| 779 | case ('u'): // decimal unsigned integer |
|---|
| 780 | for( i=0 ; i<10 ; i++) |
|---|
| 781 | { |
|---|
| 782 | buf[9-i] = HexaTab[val % 10]; |
|---|
| 783 | if (!(val /= 10)) break; |
|---|
| 784 | } |
|---|
| 785 | len = i+1; |
|---|
| 786 | pbuf = &buf[9-i]; |
|---|
| 787 | break; |
|---|
| 788 | case ('x'): // hexadecimal integer |
|---|
| 789 | _tty_write( "0x", 2, channel ); |
|---|
| 790 | for( i=0 ; i<8 ; i++) |
|---|
| 791 | { |
|---|
| 792 | buf[7-i] = HexaTab[val % 16U]; |
|---|
| 793 | if (!(val /= 16U)) break; |
|---|
| 794 | } |
|---|
| 795 | len = i+1; |
|---|
| 796 | pbuf = &buf[7-i]; |
|---|
| 797 | break; |
|---|
| 798 | case ('s'): // string |
|---|
| 799 | { |
|---|
| 800 | char *str = (char*)val; |
|---|
| 801 | while ( str[len] ) len++; |
|---|
| 802 | pbuf = (char*)val; |
|---|
| 803 | } |
|---|
| 804 | break; |
|---|
| 805 | default: |
|---|
| 806 | goto printf_text; |
|---|
| 807 | } // end switch |
|---|
| 808 | |
|---|
| 809 | _tty_write( pbuf, len, channel ); |
|---|
| 810 | goto printf_text; |
|---|
| 811 | } |
|---|
| 812 | } // end printf() |
|---|
| 813 | |
|---|
| 814 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 815 | // These functions are the ISRs that must be executed when an IRQ is activated |
|---|
| 816 | // by the TTY: _tty_isr_XX is associated to TTY channel [XX]. |
|---|
| 817 | // It save the character in the communication buffer _tty_get_buf[XX], |
|---|
| 818 | // and set the set/reset variable _tty_get_full[XX]. |
|---|
| 819 | // A character is lost if the buffer is full when the ISR is executed. |
|---|
| 820 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 821 | in_drivers void _tty_isr_indexed(size_t index) |
|---|
| 822 | { |
|---|
| 823 | unsigned int base = (unsigned int)&seg_tty_base; |
|---|
| 824 | unsigned int offset = (index*TTY_SPAN + TTY_READ) << 2; |
|---|
| 825 | |
|---|
| 826 | _tty_channel[index].get_buf = _byte_extended_read(CLUSTER_IO, base + offset); |
|---|
| 827 | _tty_channel[index].get_full = 1; // signals character available |
|---|
| 828 | } |
|---|
| 829 | |
|---|
| 830 | in_drivers void _tty_isr() { _tty_isr_indexed(0); } |
|---|
| 831 | |
|---|
| 832 | in_drivers void _tty_isr_00() { _tty_isr_indexed(0); } |
|---|
| 833 | in_drivers void _tty_isr_01() { _tty_isr_indexed(1); } |
|---|
| 834 | in_drivers void _tty_isr_02() { _tty_isr_indexed(2); } |
|---|
| 835 | in_drivers void _tty_isr_03() { _tty_isr_indexed(3); } |
|---|
| 836 | in_drivers void _tty_isr_04() { _tty_isr_indexed(4); } |
|---|
| 837 | in_drivers void _tty_isr_05() { _tty_isr_indexed(5); } |
|---|
| 838 | in_drivers void _tty_isr_06() { _tty_isr_indexed(6); } |
|---|
| 839 | in_drivers void _tty_isr_07() { _tty_isr_indexed(7); } |
|---|
| 840 | in_drivers void _tty_isr_08() { _tty_isr_indexed(8); } |
|---|
| 841 | in_drivers void _tty_isr_09() { _tty_isr_indexed(9); } |
|---|
| 842 | in_drivers void _tty_isr_10() { _tty_isr_indexed(10); } |
|---|
| 843 | in_drivers void _tty_isr_11() { _tty_isr_indexed(11); } |
|---|
| 844 | in_drivers void _tty_isr_12() { _tty_isr_indexed(12); } |
|---|
| 845 | in_drivers void _tty_isr_13() { _tty_isr_indexed(13); } |
|---|
| 846 | in_drivers void _tty_isr_14() { _tty_isr_indexed(14); } |
|---|
| 847 | in_drivers void _tty_isr_15() { _tty_isr_indexed(15); } |
|---|
| 848 | in_drivers void _tty_isr_16() { _tty_isr_indexed(16); } |
|---|
| 849 | in_drivers void _tty_isr_17() { _tty_isr_indexed(17); } |
|---|
| 850 | in_drivers void _tty_isr_18() { _tty_isr_indexed(18); } |
|---|
| 851 | in_drivers void _tty_isr_19() { _tty_isr_indexed(19); } |
|---|
| 852 | in_drivers void _tty_isr_20() { _tty_isr_indexed(20); } |
|---|
| 853 | in_drivers void _tty_isr_21() { _tty_isr_indexed(21); } |
|---|
| 854 | in_drivers void _tty_isr_22() { _tty_isr_indexed(22); } |
|---|
| 855 | in_drivers void _tty_isr_23() { _tty_isr_indexed(23); } |
|---|
| 856 | in_drivers void _tty_isr_24() { _tty_isr_indexed(24); } |
|---|
| 857 | in_drivers void _tty_isr_25() { _tty_isr_indexed(25); } |
|---|
| 858 | in_drivers void _tty_isr_26() { _tty_isr_indexed(26); } |
|---|
| 859 | in_drivers void _tty_isr_27() { _tty_isr_indexed(27); } |
|---|
| 860 | in_drivers void _tty_isr_28() { _tty_isr_indexed(28); } |
|---|
| 861 | in_drivers void _tty_isr_29() { _tty_isr_indexed(29); } |
|---|
| 862 | in_drivers void _tty_isr_30() { _tty_isr_indexed(30); } |
|---|
| 863 | in_drivers void _tty_isr_31() { _tty_isr_indexed(31); } |
|---|
| 864 | |
|---|
| 865 | |
|---|
| 866 | ////////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 867 | // BLOCK_DEVICE (IOC) |
|---|
| 868 | ////////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 869 | // The block size is 512 bytes. |
|---|
| 870 | // The functions below use the three variables _ioc_lock _ioc_done, |
|---|
| 871 | // and _ioc_status for synchronisation. |
|---|
| 872 | // - As the IOC component can be used by several programs running in parallel, |
|---|
| 873 | // the _ioc_lock variable guaranties exclusive access to the device. |
|---|
| 874 | // The _ioc_read() and _ioc_write() functions use atomic LL/SC to get the lock. |
|---|
| 875 | // and set _ioc_lock to a non zero value. |
|---|
| 876 | // The _ioc_write() and _ioc_read() functions are blocking, polling the _ioc_lock |
|---|
| 877 | // variable until the device is available. |
|---|
| 878 | // - When the tranfer is completed, the ISR routine activated by the IOC IRQ |
|---|
| 879 | // set the _ioc_done variable to a non-zero value. Possible address errors detected |
|---|
| 880 | // by the IOC peripheral are reported by the ISR in the _ioc_status variable. |
|---|
| 881 | // The _ioc_completed() function is polling the _ioc_done variable, waiting for |
|---|
| 882 | // tranfer conpletion. When the completion is signaled, the _ioc_completed() function |
|---|
| 883 | // reset the _ioc_done variable to zero, and releases the _ioc_lock variable. |
|---|
| 884 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 885 | // If USE_IOC_RDK is set, we access a "virtual" block device controler implemented |
|---|
| 886 | // as a memory-mapped segment in cluster [0,0] at address seg_ramdisk_base. |
|---|
| 887 | // The tranfer being fully synchronous, the IOC interrupt is not activated. |
|---|
| 888 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 889 | |
|---|
| 890 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 891 | // This blocking function is used by the _ioc_read() and _ioc_write() functions |
|---|
| 892 | // to get _ioc_lock using LL/SC. |
|---|
| 893 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 894 | in_drivers void _ioc_get_lock() |
|---|
| 895 | { |
|---|
| 896 | register unsigned int* plock = (unsigned int*)&_ioc_lock; |
|---|
| 897 | |
|---|
| 898 | asm volatile ( |
|---|
| 899 | "1: \n" |
|---|
| 900 | "ll $2, 0(%0) \n" // $2 <= _ioc_lock |
|---|
| 901 | "bnez $2, 1b \n" // retry if busy |
|---|
| 902 | "li $3, 1 \n" // prepare argument for sc |
|---|
| 903 | "sc $3, 0(%0) \n" // try to set _ioc_busy |
|---|
| 904 | "beqz $3, 1b \n" // retry if not atomic |
|---|
| 905 | ::"r"(plock) :"$2","$3"); |
|---|
| 906 | } |
|---|
| 907 | |
|---|
| 908 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 909 | // Transfer data from a memory buffer to the block_device. |
|---|
| 910 | // - lba : first block index on the disk |
|---|
| 911 | // - buffer : base address of the memory buffer |
|---|
| 912 | // - count : number of blocks to be transfered |
|---|
| 913 | // - ext : cluster index for the memory buffer |
|---|
| 914 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 915 | in_drivers void _ioc_write( size_t lba, |
|---|
| 916 | void* buffer, |
|---|
| 917 | size_t count, |
|---|
| 918 | size_t ext ) |
|---|
| 919 | { |
|---|
| 920 | // get the lock |
|---|
| 921 | _ioc_get_lock(); |
|---|
| 922 | |
|---|
| 923 | if ( USE_IOC_RDK ) // we use an extended_memcpy |
|---|
| 924 | { |
|---|
| 925 | unsigned int src_address = (unsigned int)buffer; |
|---|
| 926 | unsigned int src_cluster = ext; |
|---|
| 927 | unsigned int dst_address = (unsigned int)&seg_ramdisk_base + lba*512; |
|---|
| 928 | unsigned int dst_cluster = 0; |
|---|
| 929 | |
|---|
| 930 | _extended_memcpy( dst_cluster, |
|---|
| 931 | dst_address, |
|---|
| 932 | src_cluster, |
|---|
| 933 | src_address, |
|---|
| 934 | count*512 ); |
|---|
| 935 | |
|---|
| 936 | _ioc_status = BLOCK_DEVICE_WRITE_SUCCESS; |
|---|
| 937 | _ioc_done = 1; |
|---|
| 938 | |
|---|
| 939 | return; |
|---|
| 940 | } |
|---|
| 941 | |
|---|
| 942 | unsigned int base = (unsigned int)&seg_ioc_base; |
|---|
| 943 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_BUFFER*4, (unsigned int)buffer ); |
|---|
| 944 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_BUFFER_EXT*4, ext ); |
|---|
| 945 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_COUNT*4, count ); |
|---|
| 946 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_LBA*4, lba ); |
|---|
| 947 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_IRQ_ENABLE*4, 1 ); |
|---|
| 948 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_OP*4, BLOCK_DEVICE_WRITE ); |
|---|
| 949 | } |
|---|
| 950 | |
|---|
| 951 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 952 | // Transfer data from a file on the block device to a memory buffer. |
|---|
| 953 | // - lba : first block index on the disk |
|---|
| 954 | // - buffer : base address of the memory buffer |
|---|
| 955 | // - count : number of blocks to be transfered |
|---|
| 956 | // - ext : cluster index for the memory buffer |
|---|
| 957 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 958 | in_drivers void _ioc_read( size_t lba, |
|---|
| 959 | void* buffer, |
|---|
| 960 | size_t count, |
|---|
| 961 | size_t ext ) |
|---|
| 962 | { |
|---|
| 963 | // get the lock |
|---|
| 964 | _ioc_get_lock(); |
|---|
| 965 | |
|---|
| 966 | if ( USE_IOC_RDK ) // we use an extended_memcpy |
|---|
| 967 | { |
|---|
| 968 | unsigned int dst_address = (unsigned int)buffer; |
|---|
| 969 | unsigned int dst_cluster = ext; |
|---|
| 970 | unsigned int src_address = (unsigned int)&seg_ramdisk_base + lba*512; |
|---|
| 971 | unsigned int src_cluster = 0; |
|---|
| 972 | |
|---|
| 973 | _extended_memcpy( dst_cluster, |
|---|
| 974 | dst_address, |
|---|
| 975 | src_cluster, |
|---|
| 976 | src_address, |
|---|
| 977 | count*512 ); |
|---|
| 978 | |
|---|
| 979 | _ioc_status = BLOCK_DEVICE_READ_SUCCESS; |
|---|
| 980 | _ioc_done = 1; |
|---|
| 981 | |
|---|
| 982 | return; |
|---|
| 983 | } |
|---|
| 984 | |
|---|
| 985 | const unsigned int base = (unsigned int)&seg_ioc_base; |
|---|
| 986 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_BUFFER*4, (unsigned int)buffer ); |
|---|
| 987 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_BUFFER_EXT*4, ext ); |
|---|
| 988 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_COUNT*4, count ); |
|---|
| 989 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_LBA*4, lba ); |
|---|
| 990 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_IRQ_ENABLE*4, 1 ); |
|---|
| 991 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_OP*4, BLOCK_DEVICE_READ ); |
|---|
| 992 | } |
|---|
| 993 | |
|---|
| 994 | in_drivers inline unsigned int _ioc_get_blocksize() { |
|---|
| 995 | const unsigned int base = (unsigned int)&seg_ioc_base; |
|---|
| 996 | return _word_extended_read( CLUSTER_IO, base + BLOCK_DEVICE_BLOCK_SIZE*4 ); |
|---|
| 997 | } |
|---|
| 998 | |
|---|
| 999 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1000 | // This blocking function cheks completion of an I/O transfer and reports errors. |
|---|
| 1001 | // It returns 0 if the transfer is successfully completed. |
|---|
| 1002 | // It returns -1 if an error has been reported. |
|---|
| 1003 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1004 | in_drivers void _ioc_completed() |
|---|
| 1005 | { |
|---|
| 1006 | // waiting for completion |
|---|
| 1007 | while (_ioc_done == 0) asm volatile("nop"); |
|---|
| 1008 | |
|---|
| 1009 | // reset synchronisation variables |
|---|
| 1010 | _ioc_done = 0; |
|---|
| 1011 | _ioc_lock = 0; |
|---|
| 1012 | |
|---|
| 1013 | if( (_ioc_status != BLOCK_DEVICE_READ_SUCCESS) && |
|---|
| 1014 | (_ioc_status != BLOCK_DEVICE_WRITE_SUCCESS) ) |
|---|
| 1015 | { |
|---|
| 1016 | _tty_get_lock( 0 ); |
|---|
| 1017 | _tty_puts( "ERROR in _ioc_completed()\n"); |
|---|
| 1018 | _tty_release_lock( 0 ); |
|---|
| 1019 | _exit(); |
|---|
| 1020 | } |
|---|
| 1021 | } |
|---|
| 1022 | |
|---|
| 1023 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1024 | // This ISR must be executed when an IRQ is activated by IOC to signal completion. |
|---|
| 1025 | // It acknowledge the IRQ using the ioc base address, save the status in _ioc_status, |
|---|
| 1026 | // and set the _ioc_done variable to signal completion. |
|---|
| 1027 | // This variable is defined in the drivers.c file. |
|---|
| 1028 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1029 | in_drivers void _ioc_isr() |
|---|
| 1030 | { |
|---|
| 1031 | unsigned int base = (unsigned int)&seg_ioc_base; |
|---|
| 1032 | |
|---|
| 1033 | _ioc_status = _word_extended_read( CLUSTER_IO, base + BLOCK_DEVICE_STATUS*4 ); |
|---|
| 1034 | _ioc_done = 1; // signals completion |
|---|
| 1035 | } |
|---|
| 1036 | |
|---|
| 1037 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1038 | // FRAME_BUFFER |
|---|
| 1039 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1040 | // The _fb_sync_write & _fb_sync_read functions use a memcpy strategy to implement |
|---|
| 1041 | // the transfer between a data buffer and the frame buffer. |
|---|
| 1042 | // They are blocking until completion of the transfer. |
|---|
| 1043 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1044 | |
|---|
| 1045 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1046 | // _fb_sync_write() |
|---|
| 1047 | // Transfer data from an user buffer to the frame_buffer device with a memcpy. |
|---|
| 1048 | // - offset : offset (in bytes) in the frame buffer |
|---|
| 1049 | // - buffer : base address of the memory buffer |
|---|
| 1050 | // - length : number of bytes to be transfered |
|---|
| 1051 | // - ext : cluster_xy for the user buffer |
|---|
| 1052 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1053 | in_drivers void _fb_sync_write( unsigned int offset, |
|---|
| 1054 | unsigned int buffer, |
|---|
| 1055 | unsigned int length, |
|---|
| 1056 | unsigned int ext ) |
|---|
| 1057 | { |
|---|
| 1058 | unsigned int src_address = buffer; |
|---|
| 1059 | unsigned int src_cluster = ext; |
|---|
| 1060 | unsigned int dst_address = (unsigned int)&seg_fbf_base + offset; |
|---|
| 1061 | |
|---|
| 1062 | _extended_memcpy( CLUSTER_IO, |
|---|
| 1063 | dst_address, |
|---|
| 1064 | src_cluster, |
|---|
| 1065 | src_address, |
|---|
| 1066 | length ); |
|---|
| 1067 | } |
|---|
| 1068 | |
|---|
| 1069 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1070 | // _fb_sync_read() |
|---|
| 1071 | // Transfer data from the frame_buffer device to an user buffer with a memcpy. |
|---|
| 1072 | // - offset : offset (in bytes) in the frame buffer |
|---|
| 1073 | // - buffer : base address of the memory buffer |
|---|
| 1074 | // - length : number of bytes to be transfered |
|---|
| 1075 | // - ext : cluster_xy for the user buffer |
|---|
| 1076 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1077 | in_drivers void _fb_sync_read( unsigned int offset, |
|---|
| 1078 | unsigned int buffer, |
|---|
| 1079 | unsigned int length, |
|---|
| 1080 | unsigned int ext ) |
|---|
| 1081 | { |
|---|
| 1082 | unsigned int dst_address = buffer; |
|---|
| 1083 | unsigned int dst_cluster = ext; |
|---|
| 1084 | unsigned int src_address = (unsigned int)&seg_fbf_base + offset; |
|---|
| 1085 | |
|---|
| 1086 | _extended_memcpy( dst_cluster, |
|---|
| 1087 | dst_address, |
|---|
| 1088 | CLUSTER_IO, |
|---|
| 1089 | src_address, |
|---|
| 1090 | length ); |
|---|
| 1091 | } |
|---|
| 1092 | |
|---|
| 1093 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1094 | // This ISR must be executed when an IRQ is activated by MEMC to signal |
|---|
| 1095 | // an error detected by the TSAR memory cache after a write transaction. |
|---|
| 1096 | // It displays an error message on the TTY terminal allocated to the processor |
|---|
| 1097 | // executing the ISR. |
|---|
| 1098 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1099 | in_drivers void _mmc_isr() |
|---|
| 1100 | { |
|---|
| 1101 | //int* mmc_address = (int*)&seg_mmc_base; |
|---|
| 1102 | unsigned int cluster_xy = _procid() / NB_PROCS_MAX; |
|---|
| 1103 | |
|---|
| 1104 | _tty_printf( "WRITE ERROR signaled by Memory Cache in cluster %x\n", cluster_xy ); |
|---|
| 1105 | } |
|---|
| 1106 | |
|---|
| 1107 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1108 | // Release a software spin-lock |
|---|
| 1109 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1110 | in_drivers void _release_lock(size_t index) |
|---|
| 1111 | |
|---|
| 1112 | { |
|---|
| 1113 | if( index >= NB_LOCKS ) |
|---|
| 1114 | { |
|---|
| 1115 | _tty_get_lock( 0 ); |
|---|
| 1116 | _tty_puts( "ERROR in _release_lock()" ); |
|---|
| 1117 | _tty_release_lock( 0 ); |
|---|
| 1118 | _exit(); |
|---|
| 1119 | } |
|---|
| 1120 | |
|---|
| 1121 | _spin_lock[index] = 0; |
|---|
| 1122 | } |
|---|
| 1123 | |
|---|
| 1124 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1125 | // Try to take a software spin-lock. |
|---|
| 1126 | // This is a blocking call, as there is a busy-waiting loop, |
|---|
| 1127 | // until the lock is granted to the requester. |
|---|
| 1128 | // There is an internal delay of about 100 cycles between |
|---|
| 1129 | // two successive lock read, to avoid bus saturation. |
|---|
| 1130 | /////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1131 | in_drivers void _get_lock(size_t index) |
|---|
| 1132 | { |
|---|
| 1133 | if( index >= NB_LOCKS ) |
|---|
| 1134 | { |
|---|
| 1135 | _tty_get_lock( 0 ); |
|---|
| 1136 | _tty_puts( "ERROR in _get_lock()" ); |
|---|
| 1137 | _tty_release_lock( 0 ); |
|---|
| 1138 | _exit(); |
|---|
| 1139 | } |
|---|
| 1140 | |
|---|
| 1141 | register int delay = ((_proctime() +_procid()) & 0xF) << 4; |
|---|
| 1142 | register int * plock = (int *) &_spin_lock[index]; |
|---|
| 1143 | |
|---|
| 1144 | asm volatile ("_locks_llsc: \n" |
|---|
| 1145 | "ll $2, 0(%0) \n" // $2 <= _locks_lock |
|---|
| 1146 | "bnez $2, _locks_delay \n" // random delay if busy |
|---|
| 1147 | "li $3, 1 \n" // prepare argument for sc |
|---|
| 1148 | "sc $3, 0(%0) \n" // try to set _locks_busy |
|---|
| 1149 | "bnez $3, _locks_ok \n" // exit if atomic |
|---|
| 1150 | "_locks_delay: \n" |
|---|
| 1151 | "move $4, %1 \n" // $4 <= delay |
|---|
| 1152 | "_locks_loop: \n" |
|---|
| 1153 | "addi $4, $4, -1 \n" // $4 <= $4 - 1 |
|---|
| 1154 | "beqz $4, _locks_loop \n" // test end delay |
|---|
| 1155 | "j _locks_llsc \n" // retry |
|---|
| 1156 | "_locks_ok: \n" |
|---|
| 1157 | ::"r"(plock),"r"(delay):"$2","$3","$4"); |
|---|
| 1158 | } |
|---|
| 1159 | |
|---|
| 1160 | |
|---|
| 1161 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1162 | // This function makes a cooperative initialisation of the barrier: |
|---|
| 1163 | // - barrier_count[index] <= N |
|---|
| 1164 | // - barrier_lock[index] <= 0 |
|---|
| 1165 | // All tasks try to initialize the barrier, but the initialisation |
|---|
| 1166 | // is done by only one task, using LL/SC instructions. |
|---|
| 1167 | // This cooperative initialisation is questionnable, |
|---|
| 1168 | // because the barrier can ony be initialised once... |
|---|
| 1169 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1170 | in_drivers void _barrier_init(unsigned int index, unsigned int value) |
|---|
| 1171 | { |
|---|
| 1172 | register int* pinit = (int*)&_barrier_value[index]; |
|---|
| 1173 | register int* pcount = (int*)&_barrier_count[index]; |
|---|
| 1174 | register int* plock = (int*)&_barrier_lock[index]; |
|---|
| 1175 | |
|---|
| 1176 | if ( index >= NB_BARRIERS ) |
|---|
| 1177 | { |
|---|
| 1178 | _tty_get_lock( 0 ); |
|---|
| 1179 | _tty_puts( "ERROR in _barrier_init()" ); |
|---|
| 1180 | _tty_release_lock( 0 ); |
|---|
| 1181 | _exit(); |
|---|
| 1182 | } |
|---|
| 1183 | |
|---|
| 1184 | // parallel initialisation using atomic instructions LL/SC |
|---|
| 1185 | asm volatile ("_barrier_init_test: \n" |
|---|
| 1186 | "ll $2, 0(%0) \n" // read barrier_value |
|---|
| 1187 | "bnez $2, _barrier_init_done \n" |
|---|
| 1188 | "move $3, %3 \n" |
|---|
| 1189 | "sc $3, 0(%0) \n" // try to write barrier_value |
|---|
| 1190 | "beqz $3, _barrier_init_test \n" |
|---|
| 1191 | "move $3, %3 \n" |
|---|
| 1192 | "sw $3, 0(%1) \n" // barrier_count <= barrier_value |
|---|
| 1193 | "move $3, $0 \n" // |
|---|
| 1194 | "sw $3, 0(%2) \n" // barrier_lock <= 0 |
|---|
| 1195 | "_barrier_init_done: \n" |
|---|
| 1196 | ::"r"(pinit),"r"(pcount),"r"(plock),"r"(value):"$2","$3"); |
|---|
| 1197 | } |
|---|
| 1198 | |
|---|
| 1199 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1200 | // This blocking function uses a busy_wait technics (on the barrier_lock value), |
|---|
| 1201 | // because the GIET does not support dynamic scheduling/descheduling of tasks. |
|---|
| 1202 | // The barrier state is actually defined by two variables: |
|---|
| 1203 | // _barrier_count[index] define the number of particpants that are waiting |
|---|
| 1204 | // _barrier_lock[index] define the bool variable whose value is polled |
|---|
| 1205 | // The last participant change the value of _barrier_lock[index] to release the barrier... |
|---|
| 1206 | // There is at most 16 independant barriers, and an error is returned |
|---|
| 1207 | // if the barrier index is larger than 15. |
|---|
| 1208 | ////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 1209 | in_drivers void _barrier_wait(unsigned int index) |
|---|
| 1210 | { |
|---|
| 1211 | register int* pcount = (int*)&_barrier_count[index]; |
|---|
| 1212 | register int count; |
|---|
| 1213 | int lock = _barrier_lock[index]; |
|---|
| 1214 | |
|---|
| 1215 | if ( index >= NB_BARRIERS ) |
|---|
| 1216 | { |
|---|
| 1217 | _tty_get_lock( 0 ); |
|---|
| 1218 | _tty_puts( "ERROR in _barrier_wait()" ); |
|---|
| 1219 | _tty_release_lock( 0 ); |
|---|
| 1220 | _exit(); |
|---|
| 1221 | } |
|---|
| 1222 | |
|---|
| 1223 | // parallel decrement _barrier_count[index] using atomic instructions LL/SC |
|---|
| 1224 | // input : pointer on _barrier_count[index] |
|---|
| 1225 | // output : count = _barrier_count[index] (before decrementation) |
|---|
| 1226 | asm volatile ("_barrier_decrement: \n" |
|---|
| 1227 | "ll %0, 0(%1) \n" |
|---|
| 1228 | "addi $3, %0, -1 \n" |
|---|
| 1229 | "sc $3, 0(%1) \n" |
|---|
| 1230 | "beqz $3, _barrier_decrement \n" |
|---|
| 1231 | :"=&r"(count) |
|---|
| 1232 | :"r"(pcount) |
|---|
| 1233 | :"$2","$3"); |
|---|
| 1234 | |
|---|
| 1235 | // the last task re-initializes the barrier_ count variable |
|---|
| 1236 | // and the barrier_lock variable, waking up all other waiting tasks |
|---|
| 1237 | |
|---|
| 1238 | if ( count == 1 ) // last task |
|---|
| 1239 | { |
|---|
| 1240 | _barrier_count[index] = _barrier_value[index]; |
|---|
| 1241 | asm volatile( "sync" ); |
|---|
| 1242 | _barrier_lock[index] = (lock == 0) ? 1 : 0; |
|---|
| 1243 | } |
|---|
| 1244 | else // other tasks |
|---|
| 1245 | { |
|---|
| 1246 | while ( lock == _barrier_lock[index] ); |
|---|
| 1247 | } |
|---|
| 1248 | } |
|---|
| 1249 | |
|---|
| 1250 | |
|---|
| 1251 | // Local Variables: |
|---|
| 1252 | // tab-width: 4; |
|---|
| 1253 | // c-basic-offset: 4; |
|---|
| 1254 | // c-file-offsets:((innamespace . 0)(inline-open . 0)); |
|---|
| 1255 | // indent-tabs-mode: nil; |
|---|
| 1256 | // End: |
|---|
| 1257 | // |
|---|
| 1258 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
|---|
| 1259 | |
|---|
