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42 | 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 | /* As the name says... |
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23 | All the hardware-dependent functions |
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24 | IDT/GDT management |
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25 | context switch |
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26 | IRQ/Exc handling... */ |
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27 | |||
28 | #ifndef __LL_I386_HW_FUNC_H__ |
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29 | #define __LL_I386_HW_FUNC_H__ |
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30 | |||
31 | #include <ll/i386/defs.h> |
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32 | BEGIN_DEF |
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33 | |||
34 | #include <ll/i386/hw-instr.h> |
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35 | |||
36 | /* Low level exit functions! It will halt, reboot or |
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37 | * give back the control to X, depending on how YAMME started... |
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38 | */ |
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39 | void __exit(int code) __attribute__((noreturn)); |
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40 | void halt(void); |
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41 | |||
42 | /* Functions to reboot the machine */ |
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43 | void cold_reboot(void); |
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44 | void warm_reboot(void); |
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45 | void reboot(int mode); |
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46 | |||
47 | /* System tables management functions */ |
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48 | void IDT_place(BYTE num,void (*handler)(void)); |
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49 | void GDT_place(WORD sel,DWORD base,DWORD lim,BYTE acc,BYTE gran); |
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50 | DWORD GDT_read(WORD sel,DWORD *lim,BYTE *acc,BYTE *gran); |
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51 | LIN_ADDR addr2linear(unsigned short sel,unsigned long offset); |
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52 | |||
53 | /* These 3 function realize the context switching. The context_save has */ |
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54 | /* to be the first call of a kernel primitive, and the context_change has */ |
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55 | /* to be the last call. */ |
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56 | /* The context_save disables the interrupt (a kernel primitive must be */ |
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57 | /* atomic) and return the context of the running task. */ |
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58 | /* The context_change take the context of the new task (or of the */ |
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59 | /* same task), switch to the new context and return restoring the flag */ |
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60 | /* register. */ |
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61 | /* The context_load is used when the task is going to be killed; then its */ |
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62 | /* context does not need to be saved; we only need to load the context of */ |
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63 | /* the new task; the effective implementation of this functions can vary */ |
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64 | /* greatly throughout different implementations as some of them are */ |
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65 | /* mapped to empty functions or mapped one onto another */ |
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66 | |||
67 | CONTEXT ll_context_save(void); |
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68 | void ll_context_change(CONTEXT c); |
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69 | void ll_context_load(CONTEXT c); |
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70 | |||
71 | CONTEXT ll_context_from(void); |
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72 | void ll_context_to(CONTEXT c); |
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73 | |||
74 | |||
75 | |||
76 | void *l1_init(void); |
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77 | void IDT_init(void); |
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78 | void l1_end(void); |
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79 | void l1_int_bind(int i, void *f); |
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80 | END_DEF |
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81 | |||
82 | #endif |