[5d807b5] | 1 | /* timer.c |
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| 2 | * |
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| 3 | * This file implements a benchmark timer using the General Purpose Timer. |
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| 4 | * |
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[4fb2a19] | 5 | * Notes: NONE |
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[5d807b5] | 6 | * |
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[4fb2a19] | 7 | * COPYRIGHT (c) 1989-2000. |
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[5d807b5] | 8 | * On-Line Applications Research Corporation (OAR). |
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| 9 | * |
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| 10 | * The license and distribution terms for this file may in |
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| 11 | * the file LICENSE in this distribution or at |
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[21e1c44] | 12 | * http://www.rtems.com/license/LICENSE. |
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[5d807b5] | 13 | * |
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| 14 | * $Id$ |
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| 15 | */ |
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| 16 | |
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[a73a977] | 17 | #include <rtems/system.h> |
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[5d807b5] | 18 | #include <assert.h> |
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[8e13ca61] | 19 | #include <rtems.h> |
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[133ddf2e] | 20 | #include <bsp.h> |
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[5d807b5] | 21 | |
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[66c373bf] | 22 | uint64_t Timer_driver_Start_time; |
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[5d807b5] | 23 | |
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| 24 | rtems_boolean Timer_driver_Find_average_overhead = 0; |
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| 25 | unsigned clicks_overhead = 0; |
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| 26 | |
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| 27 | /* |
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| 28 | * Timer Get overhead |
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| 29 | */ |
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| 30 | |
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| 31 | int Timer_get_clicks_overhead() |
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| 32 | { |
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[66c373bf] | 33 | uint64_t clicks; |
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[5d807b5] | 34 | |
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[e208738] | 35 | PPC_Set_timebase_register((uint64_t) 0); |
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[5d807b5] | 36 | clicks = PPC_Get_timebase_register(); |
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| 37 | assert(clicks <= 0xffffffff); |
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| 38 | clicks_overhead = (unsigned) clicks; |
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| 39 | return clicks_overhead; |
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| 40 | } |
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| 41 | |
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| 42 | /* |
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| 43 | * Timer_initialize |
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| 44 | */ |
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| 45 | void Timer_initialize() |
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| 46 | { |
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| 47 | |
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| 48 | /* |
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| 49 | * Timer runs long and accurate enough not to require an interrupt. |
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| 50 | */ |
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| 51 | |
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| 52 | if (clicks_overhead == 0) clicks_overhead = Timer_get_clicks_overhead(); |
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[e208738] | 53 | PPC_Set_timebase_register((uint64_t) 0); |
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[5d807b5] | 54 | } |
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| 55 | |
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| 56 | |
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| 57 | /* |
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| 58 | * Read_timer |
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| 59 | */ |
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[8e13ca61] | 60 | |
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[5d807b5] | 61 | int Read_timer() |
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| 62 | { |
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[66c373bf] | 63 | uint64_t total64; |
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| 64 | uint32_t total; |
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[5d807b5] | 65 | |
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| 66 | /* approximately CLOCK_SPEED clicks per microsecond */ |
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| 67 | |
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| 68 | total64 = PPC_Get_timebase_register(); |
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| 69 | |
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[66c373bf] | 70 | assert( total64 <= 0xffffffff ); /* fits into a uint32_t */ |
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[5d807b5] | 71 | |
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[e208738] | 72 | total = (uint32_t) total64; |
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[5d807b5] | 73 | |
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| 74 | if ( Timer_driver_Find_average_overhead == 1 ) |
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| 75 | return total; /* in "clicks" of the decrementer units */ |
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| 76 | |
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| 77 | return (int) BSP_Convert_decrementer(total - clicks_overhead); |
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| 78 | } |
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| 79 | |
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| 80 | unsigned long long Read_long_timer() |
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| 81 | { |
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[66c373bf] | 82 | uint64_t total64; |
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[5d807b5] | 83 | |
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| 84 | total64 = PPC_Get_timebase_register(); |
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| 85 | return BSP_Convert_decrementer(total64 - clicks_overhead); |
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| 86 | } |
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| 87 | |
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| 88 | rtems_status_code Empty_function( void ) |
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| 89 | { |
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| 90 | return RTEMS_SUCCESSFUL; |
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| 91 | } |
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| 92 | |
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| 93 | void Set_find_average_overhead( |
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| 94 | rtems_boolean find_flag |
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| 95 | ) |
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| 96 | { |
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| 97 | Timer_driver_Find_average_overhead = find_flag; |
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| 98 | } |
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