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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 | /* Access the info stucture */ |
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| 23 | |||
| 24 | #include <ll/i386/stdlib.h> |
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| 25 | #include <ll/i386/hw-func.h> |
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| 26 | #include <ll/i386/mb-info.h> |
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| 27 | #include <ll/i386/x-bios.h> |
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| 28 | |||
| 29 | FILE(X - Info); |
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| 30 | |||
| 31 | /* |
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| 32 | The x_bios is stored in the low memory area and contains all the |
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| 33 | stuff necessary to perform a BIOS call from PM; it can be accessed |
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| 34 | using a linear pointer, which is returned by the following call! |
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| 35 | */ |
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| 36 | |||
| 37 | X_CALLBIOS *x_bios_address(void) |
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| 38 | { |
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| 39 | X_CALLBIOS *a = |
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| 40 | (X_CALLBIOS *) GDT_read(X_CALLBIOS_SEL, NULL, NULL, NULL); |
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| 41 | return (a); |
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| 42 | } |
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| 43 | |||
| 44 | /* Stuff information retrieving function */ |
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| 45 | |||
| 46 | WORD X_version(void) |
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| 47 | { |
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| 48 | X_CALLBIOS *x_bios = x_bios_address(); |
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| 49 | return (x_bios->ver); |
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| 50 | } |
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| 51 | |||
| 52 | void X_meminfo(LIN_ADDR * b1, DWORD * s1, LIN_ADDR * b2, DWORD * s2) |
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| 53 | { |
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| 54 | struct multiboot_info *mbi = mbi_address(); |
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| 55 | if (mbi->flags & MB_INFO_USEGDT) { |
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| 56 | if (b1 != NULL) |
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| 57 | *b1 = (LIN_ADDR) mbi->mem_upbase; |
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| 58 | if (s1 != NULL) |
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| 59 | *s1 = mbi->mem_upper * 1024; |
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| 60 | if (b2 != NULL) |
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| 61 | *b2 = (LIN_ADDR) mbi->mem_lowbase; |
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| 62 | if (s2 != NULL) |
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| 63 | *s2 = mbi->mem_lower * 1024; |
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| 64 | } else { |
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| 65 | if (b1 != NULL) |
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| 66 | *b1 = (LIN_ADDR) 0x100000; |
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| 67 | if (s1 != NULL) |
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| 68 | *s1 = mbi->mem_upper * 1024; |
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| 69 | if (b2 != NULL) |
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| 70 | *b2 = (LIN_ADDR) 0x4000; |
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| 71 | if (s2 != NULL) |
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| 72 | *s2 = mbi->mem_lower * 1024; |
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| 73 | } |
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| 74 | /* |
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| 75 | #ifdef __OLD_MB__ |
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| 76 | if (b1 != NULL) *b1 = 0x100000; |
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| 77 | if (s1 != NULL) *s1 = mbi->mem_upper; |
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| 78 | if (b2 != NULL) *b2 = 0x4000; |
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| 79 | if (s2 != NULL) *s2 = mbi->mem_lower; |
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| 80 | #else |
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| 81 | if (b1 != NULL) *b1 = mbi->mem_upbase; |
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| 82 | if (s1 != NULL) *s1 = mbi->mem_upper; |
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| 83 | if (b2 != NULL) *b2 = mbi->mem_lowbase; |
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| 84 | if (s2 != NULL) *s2 = mbi->mem_lower; |
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| 85 | #endif |
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| 86 | */ |
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| 87 | } |
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| 88 | |||
| 89 | #ifdef CHECK |
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| 90 | #include <cons.h> |
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| 91 | /* Alert if a wrong addressing is intercepted */ |
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| 92 | /* Used only for debug purposes */ |
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| 93 | |||
| 94 | void check_addr(void *addr, char *caller) |
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| 95 | { |
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| 96 | extern DWORD _stktop; |
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| 97 | if ((DWORD) (addr) < _stktop) { |
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| 98 | cprintf("CRISIS! Addr : %lx(%lx) Caller was %s\n", (DWORD) (addr), |
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| 99 | _stktop, caller); |
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| 100 | } |
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| 101 | } |
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| 102 | #endif |