1 | /* |
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2 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.rtems.com/license/LICENSE. |
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7 | * |
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8 | * $Id$ |
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9 | */ |
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10 | /** |
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11 | * @file |
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12 | * |
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13 | * @ingroup rtems-rfs |
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14 | * |
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15 | * RTEMS File System Data. |
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16 | * |
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17 | * Access data in the correct byte order for the specific target we are running |
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18 | * on. |
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19 | * |
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20 | * @todo Make direct access on matching byte ordered targets. |
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21 | */ |
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22 | |
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23 | #if !defined (_RTEMS_RFS_DATA_H_) |
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24 | #define _RTEMS_RFS_DATA_H_ |
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25 | |
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26 | #include <stdint.h> |
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27 | |
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28 | /** |
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29 | * Helper function to make sure we have a byte pointer. |
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30 | */ |
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31 | #define rtems_rfs_data_ptr(_d) ((uint8_t*)(_d)) |
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32 | |
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33 | /** |
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34 | * Helper function to get the data shifted in the correctly sized type. |
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35 | */ |
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36 | #define rtems_rfs_data_get(_d, _t, _o, _s) \ |
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37 | (((_t)(rtems_rfs_data_ptr (_d)[_o])) << (_s)) |
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38 | |
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39 | /** |
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40 | * RFS Read Unsigned 8bit Integer |
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41 | */ |
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42 | #define rtems_rfs_read_u8(_d) \ |
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43 | (*rtems_rfs_data_ptr (_d)) |
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44 | |
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45 | /** |
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46 | * RFS Read Unsigned 16bit Integer |
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47 | */ |
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48 | #define rtems_rfs_read_u16(_d) \ |
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49 | (rtems_rfs_data_get (_d, uint16_t, 0, 8) | \ |
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50 | rtems_rfs_data_get (_d, uint16_t, 1, 0)) |
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51 | |
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52 | /** |
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53 | * RFS Read Unsigned 32bit Integer |
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54 | */ |
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55 | #define rtems_rfs_read_u32(_d) \ |
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56 | (rtems_rfs_data_get (_d, uint32_t, 0, 24) | \ |
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57 | rtems_rfs_data_get (_d, uint32_t, 1, 16) | \ |
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58 | rtems_rfs_data_get (_d, uint32_t, 2, 8) | \ |
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59 | rtems_rfs_data_get (_d, uint32_t, 3, 0)) |
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60 | |
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61 | /** |
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62 | * RFS Write Unsigned 8bit Integer |
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63 | */ |
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64 | #define rtems_rfs_write_u8(_d, _v) \ |
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65 | (*rtems_rfs_data_ptr (_d) = (uint8_t)(_v)) |
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66 | |
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67 | /** |
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68 | * RFS Write Unsigned 16bit Integer |
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69 | */ |
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70 | #define rtems_rfs_write_u16(_d, _v) \ |
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71 | do { \ |
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72 | rtems_rfs_data_ptr (_d)[0] = (uint8_t)(((uint16_t)(_v)) >> 8); \ |
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73 | rtems_rfs_data_ptr (_d)[1] = (uint8_t)((_v)); \ |
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74 | } while (0) |
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75 | |
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76 | /** |
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77 | * RFS Write Unsigned 32bit Integer |
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78 | */ |
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79 | #define rtems_rfs_write_u32(_d, _v) \ |
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80 | do { \ |
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81 | rtems_rfs_data_ptr (_d)[0] = (uint8_t)(((uint32_t)(_v)) >> 24); \ |
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82 | rtems_rfs_data_ptr (_d)[1] = (uint8_t)(((uint32_t)(_v)) >> 16); \ |
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83 | rtems_rfs_data_ptr (_d)[2] = (uint8_t)(((uint32_t)(_v)) >> 8); \ |
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84 | rtems_rfs_data_ptr (_d)[3] = (uint8_t)((uint32_t)(_v)); \ |
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85 | } while (0) |
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86 | |
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87 | #endif |
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