1 | ////////////////////////////////////////////////////////////////////////////// |
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2 | // File : kernel_locks.h |
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3 | // Date : 01/12/2014 |
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4 | // Author : alain greiner |
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5 | // Copyright (c) UPMC-LIP6 |
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6 | ////////////////////////////////////////////////////////////////////////////// |
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7 | // The locks.c and locks.h files are part of the GIET-VM nano-kernel. |
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8 | // They define both atomic increment operations and three types of locks. |
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9 | ////////////////////////////////////////////////////////////////////////////// |
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10 | |
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11 | #ifndef GIET_LOCKS_H |
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12 | #define GIET_LOCKS_H |
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13 | |
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14 | #include "hard_config.h" |
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15 | |
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16 | |
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17 | ////////////////////////////////////////////////////////////////////////////// |
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18 | // Atomic access functions using LL/SC instructions |
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19 | ////////////////////////////////////////////////////////////////////////////// |
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20 | |
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21 | extern unsigned int _atomic_increment( unsigned int* ptr, |
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22 | int increment ); |
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23 | |
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24 | extern void _atomic_or( unsigned int* ptr, |
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25 | unsigned int mask ); |
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26 | |
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27 | extern void _atomic_and( unsigned int* ptr, |
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28 | unsigned int mask ); |
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29 | |
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30 | ////////////////////////////////////////////////////////////////////////////// |
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31 | // Simple lock structure and access functions |
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32 | ////////////////////////////////////////////////////////////////////////////// |
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33 | |
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34 | typedef struct simple_lock_s |
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35 | { |
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36 | unsigned int value; // lock taken if non zero |
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37 | unsigned int padding[15]; // for 64 bytes alignment |
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38 | } simple_lock_t; |
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39 | |
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40 | extern void _simple_lock_acquire( simple_lock_t* lock ); |
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41 | |
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42 | extern void _simple_lock_release( simple_lock_t* lock ); |
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43 | |
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44 | ////////////////////////////////////////////////////////////////////////////// |
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45 | // Queuing lock structure and access functions |
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46 | ////////////////////////////////////////////////////////////////////////////// |
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47 | |
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48 | typedef struct spin_lock_s |
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49 | { |
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50 | unsigned int current; // current slot index: |
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51 | unsigned int free; // next free tiket index |
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52 | unsigned int padding[14]; // for 64 bytes alignment |
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53 | } spin_lock_t; |
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54 | |
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55 | extern void _spin_lock_init( spin_lock_t* lock ); |
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56 | |
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57 | extern void _spin_lock_acquire( spin_lock_t* lock ); |
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58 | |
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59 | extern void _spin_lock_release( spin_lock_t* lock ); |
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60 | |
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61 | |
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62 | ///////////////////////////////////////////////////////////////////////////// |
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63 | // SQT lock structures and access functions |
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64 | ///////////////////////////////////////////////////////////////////////////// |
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65 | |
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66 | typedef struct sqt_lock_node_s |
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67 | { |
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68 | unsigned int current; // current ticket index |
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69 | unsigned int free; // next free ticket index |
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70 | unsigned int level; // hierarchical level (0 is bottom) |
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71 | struct sqt_lock_node_s* parent; // parent node (NULL for root) |
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72 | struct sqt_lock_node_s* child[4]; // children node |
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73 | unsigned int padding[8]; // for 64 bytes alignment |
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74 | } sqt_lock_node_t; |
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75 | |
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76 | typedef struct sqt_lock_s |
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77 | { |
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78 | sqt_lock_node_t* node[X_SIZE][Y_SIZE][5]; // array of pointers on SBT nodes |
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79 | } sqt_lock_t; |
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80 | |
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81 | extern void _sqt_lock_init( sqt_lock_t* lock ); |
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82 | |
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83 | extern void _sqt_lock_acquire( sqt_lock_t* lock ); |
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84 | |
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85 | extern void _sqt_lock_release( sqt_lock_t* lock ); |
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86 | |
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87 | |
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88 | #endif |
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89 | |
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90 | // Local Variables: |
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91 | // tab-width: 4 |
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92 | // c-basic-offset: 4 |
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93 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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94 | // indent-tabs-mode: nil |
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95 | // End: |
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96 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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97 | |
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