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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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40 | pj | 33 | extern DWORD ticksize; /* From init.c */ |
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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2 | pj | 37 | |
38 | /* These two are for the NEW algorithm */ |
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40 | pj | 39 | extern WORD lastTime; /* From event.c */ |
40 | extern struct pitspec globalCounter; /* From event.c */ |
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2 | pj | 41 | extern BYTE frc; |
42 | extern int activeEvent; |
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43 | |||
44 | FILE(Time); |
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45 | |||
46 | TIME ll_gettime(int mode, struct timespec *tsres) |
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47 | { |
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40 | pj | 48 | DWORD res, tc; |
49 | BYTE isr; |
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50 | struct timespec tmp; |
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2 | pj | 51 | |
40 | pj | 52 | #if 1 |
53 | if (activeEvent) { |
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54 | if (tsres != NULL) { |
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55 | PITSPEC2TIMESPEC(&globalCounter, tsres); |
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56 | } else { |
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57 | struct timespec tmp; |
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2 | pj | 58 | |
40 | pj | 59 | PITSPEC2TIMESPEC(&globalCounter, &tmp); |
60 | return TIMESPEC2USEC(&tmp); |
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61 | } |
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62 | return TIMESPEC2USEC(tsres); |
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2 | pj | 63 | } |
40 | pj | 64 | #endif |
65 | |||
66 | if (mode == TIME_PTICK) { |
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67 | if (timermode != LL_PERIODIC) { |
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68 | return 0; |
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69 | } |
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70 | res = TIMESPEC2USEC(&actTime); |
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71 | if (tsres != NULL) { |
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72 | memcpy(tsres, &actTime, sizeof(struct timespec)); |
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73 | } |
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74 | return res; |
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2 | pj | 75 | } |
76 | |||
40 | pj | 77 | if (mode == TIME_NEW) { |
78 | WORD tmp; |
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79 | |||
80 | tmp = pit_read(frc); |
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81 | ADDPITSPEC((WORD)(lastTime - tmp), &globalCounter); |
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82 | lastTime = tmp; |
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83 | if (tsres != NULL) { |
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2 | pj | 84 | PITSPEC2TIMESPEC(&globalCounter, tsres); |
40 | pj | 85 | } |
86 | return (PITSPEC2USEC(&globalCounter)); |
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2 | pj | 87 | } |
88 | |||
40 | pj | 89 | if (mode == TIME_EXACT) { |
90 | if (timermode == LL_PERIODIC) { |
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91 | memcpy(&tmp, &actTime, sizeof(struct timespec)); |
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92 | /* How much time has elapsed |
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93 | * from the last Tick Boundary? |
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94 | */ |
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95 | tc = pit_read(0); |
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96 | if (tc > pit_time_const) { |
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97 | error("LL Time Panic!!!\n"); |
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98 | ll_abort(1); |
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99 | } |
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100 | res = pit_time_const - tc; |
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101 | res *= ticksize; |
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102 | res /= pit_time_const; |
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2 | pj | 103 | |
40 | pj | 104 | /* Detect tick boundary and adjust the time... */ |
105 | outp(0x20, 0x0A); |
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106 | isr = inp(0x20); |
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107 | if ((isr & 1) && res < ((8*ticksize)/10)){ |
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108 | /* |
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109 | res += ticksize; |
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110 | ADDNANO2TIMESPEC(ticksize * 1000, &tmp); |
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111 | */ |
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112 | res = ticksize; |
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113 | } |
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2 | pj | 114 | |
40 | pj | 115 | /* Sum the Tick time... */ |
116 | ADDNANO2TIMESPEC(res * 1000, &tmp); |
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117 | res += TIMESPEC2USEC(&actTime); |
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2 | pj | 118 | |
40 | pj | 119 | if (tsres != NULL) { |
120 | memcpy(tsres, &tmp, sizeof(struct timespec)); |
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121 | } |
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122 | return res; |
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123 | } else { |
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124 | return 0; |
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125 | } |
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2 | pj | 126 | } |
40 | pj | 127 | return 0; |
2 | pj | 128 | } |