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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | |
| 2 | /* Project: OSLib |
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| 3 | * Description: The OS Construction Kit |
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| 4 | * Date: 1.6.2000 |
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| 5 | * Idea by: Luca Abeni & Gerardo Lamastra |
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| 6 | * |
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| 7 | * OSLib is an SO project aimed at developing a common, easy-to-use |
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| 8 | * low-level infrastructure for developing OS kernels and Embedded |
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| 9 | * Applications; it partially derives from the HARTIK project but it |
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| 10 | * currently is independently developed. |
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| 11 | * |
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| 12 | * OSLib is distributed under GPL License, and some of its code has |
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| 13 | * been derived from the Linux kernel source; also some important |
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| 14 | * ideas come from studying the DJGPP go32 extender. |
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| 15 | * |
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| 16 | * We acknowledge the Linux Community, Free Software Foundation, |
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| 17 | * D.J. Delorie and all the other developers who believe in the |
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| 18 | * freedom of software and ideas. |
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| 19 | * |
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| 20 | * For legalese, check out the included GPL license. |
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| 21 | */ |
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| 22 | |||
| 23 | /* Interrupt Events */ |
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| 24 | |||
| 25 | #include <ll/i386/stdlib.h> |
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| 26 | #include <ll/i386/mem.h> |
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| 27 | #include <ll/i386/error.h> |
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| 28 | #include <ll/i386/hw-arch.h> |
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| 29 | #include <ll/i386/pit.h> |
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| 30 | #include <ll/sys/ll/ll-data.h> |
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| 31 | #include <ll/sys/ll/ll-instr.h> |
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| 32 | #include <ll/sys/ll/time.h> |
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| 33 | #include <ll/sys/ll/event.h> |
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| 34 | |||
| 35 | FILE(IntEvent); |
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| 36 | |||
| 37 | extern int activeInt; |
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| 38 | void (*evt_prol) (void) = NULL; |
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| 39 | void (*evt_epil) (void) = NULL; |
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| 40 | |||
| 41 | struct intentry irqs[16]; |
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| 42 | |||
| 43 | void irq_init(void) |
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| 44 | { |
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| 45 | int i; |
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| 46 | |||
| 47 | /* Initialize the interrupt handlers list!!! */ |
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| 48 | for (i = 0; i < 16; i++) { |
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| 49 | irqs[i].status = INTSTAT_FREE; |
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| 50 | irqs[i].index = i; |
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| 51 | irqs[i].handler = NULL; /* Paranoia */ |
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| 52 | irqs[i].par = NULL; /* Paranoia */ |
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| 53 | } |
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| 54 | activeInt = 0; |
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| 55 | } |
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| 56 | |||
| 57 | int ll_ActiveInt(void) |
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| 58 | { |
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| 59 | return activeInt; |
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| 60 | } |
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| 61 | |||
| 62 | int irq_bind(int irq, void (*handler) (void *p), DWORD flags) |
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| 63 | { |
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| 64 | |||
| 65 | cli(); /* Warning!!! Need to be changed... |
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| 66 | Protect or not to protect??? |
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| 67 | Probably save_flags??? */ |
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| 68 | if ((irqs[irq].status != INTSTAT_FREE) && |
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| 69 | ((flags & INT_FORCE) != INT_FORCE)) { |
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| 70 | return -1; |
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| 71 | } |
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| 72 | |||
| 73 | irqs[irq].status = INTSTAT_ASSIGNED; |
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| 74 | sti(); |
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| 75 | |||
| 76 | if (handler != NULL) { |
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| 77 | irqs[irq].handler = handler; |
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| 78 | irqs[irq].par = &(irqs[irq].index); |
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| 79 | irqs[irq].flags = flags; |
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| 80 | } else { |
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| 81 | irqs[irq].status = INTSTAT_FREE; |
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| 82 | } |
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| 83 | |||
| 84 | return 1; |
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| 85 | } |
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| 86 | |||
| 87 | void act_int(BYTE n) |
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| 88 | { |
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| 89 | static int ai_called = 0; |
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| 90 | |||
| 91 | activeInt++; |
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| 92 | if (activeInt == 1 && evt_prol != NULL) { |
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| 93 | evt_prol(); |
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| 94 | } |
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| 95 | if (irqs[n].status == INTSTAT_ASSIGNED) { |
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| 96 | irqs[n].status = INTSTAT_BUSY; |
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| 97 | if (irqs[n].flags & INT_PREEMPTABLE) { |
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| 98 | sti(); |
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| 99 | } |
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| 100 | irqs[n].handler(irqs[n].par); |
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| 101 | if (irqs[n].flags & INT_PREEMPTABLE) { |
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| 102 | cli(); |
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| 103 | } |
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| 104 | irqs[n].status = INTSTAT_ASSIGNED; |
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| 105 | } |
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| 106 | ai_called++; |
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| 107 | if (activeInt == 1 && evt_epil != NULL) { |
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| 108 | evt_epil(); |
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| 109 | } |
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| 110 | activeInt--; |
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| 111 | } |