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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 | /* Context Switch Demo */ |
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| 23 | |||
| 24 | #include <ll/i386/stdlib.h> |
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| 25 | #include <ll/i386/tss-ctx.h> |
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| 26 | #include <ll/i386/error.h> |
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| 27 | #include <ll/sys/ll/ll-instr.h> |
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| 28 | #include <ll/sys/ll/ll-func.h> |
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| 29 | |||
| 30 | #define STACK_SIZE 4096U /* Stack size in bytes */ |
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| 31 | #define USE_FPU 0x0001 |
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| 32 | |||
| 33 | WORD th1, thm; |
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| 34 | |||
| 35 | #define T 1000 |
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| 36 | |||
| 37 | #if 1 |
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| 38 | #define TO ll_context_to |
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| 39 | #define FROM ll_context_from |
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| 40 | #else |
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| 41 | #define TO ll_context_load |
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| 42 | #define FROM ll_context_save |
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| 43 | #endif |
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| 44 | |||
| 45 | /* For stack allocation checking */ |
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| 46 | BYTE stack1[STACK_SIZE]; |
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| 47 | BYTE stack2[STACK_SIZE]; |
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| 48 | |||
| 49 | void thread1(void *px) |
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| 50 | { |
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| 51 | message("Thread 1 running\n"); |
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| 52 | message("Switching to main thread\n"); |
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| 53 | TO(thm); |
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| 54 | message("Another time thread 1\n"); |
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| 55 | message("Back to main\n"); |
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| 56 | TO(thm); |
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| 57 | message("And now, finishing thread 1\n"); |
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| 58 | } |
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| 59 | |||
| 60 | void killer(void) |
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| 61 | { |
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| 62 | cli(); |
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| 63 | message("Killer!!!\n"); |
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| 64 | TO(thm); |
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| 65 | } |
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| 66 | |||
| 67 | int main (int argc, char *argv[]) |
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| 68 | { |
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| 69 | DWORD sp1, sp2; |
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| 70 | void *mbi; |
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| 71 | |||
| 72 | sp1 = get_SP(); |
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| 73 | cli(); |
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| 74 | |||
| 75 | mbi = ll_init(); |
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| 76 | |||
| 77 | if (mbi == NULL) { |
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| 78 | message("Error in LowLevel initialization code...\n"); |
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| 79 | sti(); |
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| 80 | l1_exit(-1); |
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| 81 | } |
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| 82 | sti(); |
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| 83 | message("LowLevel started...\n"); |
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| 84 | th1 = ll_context_create(thread1, &stack1[STACK_SIZE], NULL,killer, 0); |
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| 85 | thm = FROM(); |
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| 86 | message("Thread 1 created\n"); |
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| 87 | message("Switching to it...\n"); |
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| 88 | TO(th1); |
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| 89 | message("Returned to main\n"); |
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| 90 | message("And now, to thread 1 again!!!\n"); |
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| 91 | TO(th1); |
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| 92 | message("Main another time...\n"); |
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| 93 | TO(th1); |
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| 94 | message("OK, now I finish...\n"); |
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| 95 | cli(); |
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| 96 | ll_end(); |
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| 97 | sp2 = get_SP(); |
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| 98 | message("End reached!\n"); |
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| 99 | message("Actual stack : %lx - ", sp2); |
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| 100 | message("Begin stack : %lx\n", sp1); |
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| 101 | message("Check if same : %s\n",sp1 == sp2 ? "Ok :-)" : "No :-("); |
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| 102 | return 1; |
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| 103 | } |