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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* Project: OSLib |
| 2 | * Description: The OS Construction Kit |
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| 3 | * Date: 1.6.2000 |
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| 4 | * Idea by: Luca Abeni & Gerardo Lamastra |
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| 5 | * |
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| 6 | * OSLib is an SO project aimed at developing a common, easy-to-use |
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| 7 | * low-level infrastructure for developing OS kernels and Embedded |
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| 8 | * Applications; it partially derives from the HARTIK project but it |
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| 9 | * currently is independently developed. |
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| 10 | * |
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| 11 | * OSLib is distributed under GPL License, and some of its code has |
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| 12 | * been derived from the Linux kernel source; also some important |
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| 13 | * ideas come from studying the DJGPP go32 extender. |
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| 14 | * |
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| 15 | * We acknowledge the Linux Community, Free Software Foundation, |
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| 16 | * D.J. Delorie and all the other developers who believe in the |
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| 17 | * freedom of software and ideas. |
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| 18 | * |
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| 19 | * For legalese, check out the included GPL license. |
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| 20 | */ |
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| 21 | |||
| 22 | /* Time management code: ll_getttime() */ |
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| 23 | |||
| 24 | #include <ll/i386/pit.h> |
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| 25 | #include <ll/i386/stdlib.h> |
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| 26 | #include <ll/i386/error.h> |
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| 27 | #include <ll/i386/mem.h> |
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| 28 | #include <ll/sys/ll/ll-data.h> |
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| 29 | #include <ll/sys/ll/ll-func.h> |
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| 30 | #include <ll/sys/ll/time.h> |
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| 31 | |||
| 32 | /* These are for the EXECT and TICK modes */ |
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| 33 | extern DWORD ticksize; /* From init.c */ |
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| 34 | extern struct timespec actTime; /* From event.c */ |
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| 35 | extern WORD pit_time_const; /* From init.c */ |
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| 36 | extern DWORD timermode; /* From init.c */ |
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| 37 | |||
| 38 | /* These two are for the NEW algorithm */ |
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| 39 | extern WORD lastTime; /* From event.c */ |
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| 40 | extern struct pitspec globalCounter; /* From event.c */ |
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| 41 | extern BYTE frc; |
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| 42 | |||
| 43 | |||
| 44 | extern int activeEvent; |
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| 45 | |||
| 46 | FILE(Time); |
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| 47 | |||
| 48 | TIME ll_gettime(int mode, struct timespec *tsres) |
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| 49 | { |
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| 50 | DWORD res, tc; |
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| 51 | BYTE isr; |
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| 52 | struct timespec tmp; |
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| 53 | |||
| 54 | if (activeEvent) { |
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| 55 | if (tsres != NULL) { |
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| 56 | PITSPEC2TIMESPEC(&globalCounter, tsres); |
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| 57 | return TIMESPEC2USEC(tsres); |
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| 58 | } else { |
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| 59 | PITSPEC2TIMESPEC(&globalCounter, &tmp); |
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| 60 | return TIMESPEC2USEC(&tmp); |
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| 61 | } |
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| 62 | } |
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| 63 | |||
| 64 | if (mode == TIME_PTICK) { |
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| 65 | if (timermode != LL_PERIODIC) { |
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| 66 | return 0; |
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| 67 | } |
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| 68 | res = TIMESPEC2USEC(&actTime); |
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| 69 | if (tsres != NULL) { |
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| 70 | memcpy(tsres, &actTime, sizeof(struct timespec)); |
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| 71 | } |
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| 72 | return res; |
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| 73 | } |
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| 74 | |||
| 75 | if (mode == TIME_EXACT) { |
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| 76 | WORD tmp; |
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| 77 | |||
| 78 | tmp = pit_read(frc); |
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| 79 | ADDPITSPEC((WORD) (lastTime - tmp), &globalCounter); |
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| 80 | lastTime = tmp; |
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| 81 | if (tsres != NULL) { |
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| 82 | PITSPEC2TIMESPEC(&globalCounter, tsres); |
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| 83 | } |
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| 84 | return (PITSPEC2USEC(&globalCounter)); |
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| 85 | } |
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| 86 | |||
| 87 | if (mode == TIME_NEW) { |
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| 88 | if (timermode == LL_PERIODIC) { |
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| 89 | memcpy(&tmp, &actTime, sizeof(struct timespec)); |
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| 90 | /* How much time has elapsed |
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| 91 | * from the last Tick Boundary? |
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| 92 | */ |
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| 93 | tc = pit_read(0); |
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| 94 | if (tc > pit_time_const) { |
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| 95 | error("LL Time Panic!!!\n"); |
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| 96 | ll_abort(1); |
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| 97 | } |
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| 98 | res = pit_time_const - tc; |
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| 99 | res *= ticksize; |
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| 100 | res /= pit_time_const; |
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| 101 | |||
| 102 | /* Detect tick boundary and adjust the time... */ |
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| 103 | outp(0x20, 0x0A); |
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| 104 | isr = inp(0x20); |
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| 105 | if ((isr & 1) && res < ((8 * ticksize) / 10)) { |
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| 106 | /* |
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| 107 | res += ticksize; |
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| 108 | ADDNANO2TIMESPEC(ticksize * 1000, &tmp); |
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| 109 | */ |
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| 110 | res = ticksize; |
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| 111 | } |
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| 112 | |||
| 113 | /* Sum the Tick time... */ |
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| 114 | ADDNANO2TIMESPEC(res * 1000, &tmp); |
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| 115 | res += TIMESPEC2USEC(&actTime); |
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| 116 | |||
| 117 | if (tsres != NULL) { |
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| 118 | memcpy(tsres, &tmp, sizeof(struct timespec)); |
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| 119 | } |
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| 120 | return res; |
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| 121 | } else { |
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| 122 | return 0; |
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| 123 | } |
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| 124 | } |
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| 125 | return 0; |
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| 126 | } |