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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 | /* Basic Memory Manager Functions: |
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| 23 | A classic fixed partition allocator! */ |
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| 24 | |||
| 25 | #include <ll/i386/stdlib.h> |
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| 26 | #include <ll/i386/string.h> |
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| 27 | #include <ll/i386/mem.h> |
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| 28 | #include <ll/i386/cons.h> |
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| 29 | #include <ll/i386/error.h> |
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| 30 | |||
| 31 | #include <ll/sys/ll/ll-mem.h> |
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| 32 | |||
| 33 | FILE(Memory); |
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| 34 | |||
| 35 | #define MAX_PARTITION 50 /* Max available partition */ |
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| 36 | |||
| 37 | static struct { |
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| 38 | BYTE used; |
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| 39 | #ifdef __WC16__ |
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| 40 | BYTE __huge *addr; |
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| 41 | #else |
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| 42 | BYTE *addr; |
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| 43 | #endif |
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| 44 | DWORD size; |
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| 45 | } mem_table[MAX_PARTITION]; |
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| 46 | |||
| 47 | void ll_mem_init(void *base, DWORD size) |
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| 48 | { |
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| 49 | register int i; |
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| 50 | mem_table[0].used = 1; |
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| 51 | mem_table[0].addr = base; |
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| 52 | mem_table[0].size = size; |
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| 53 | for (i = 1; i < MAX_PARTITION; i++) |
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| 54 | mem_table[i].used = 0; |
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| 55 | } |
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| 56 | |||
| 57 | void *ll_alloc(DWORD s) |
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| 58 | { |
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| 59 | void *p = NULL; |
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| 60 | int i = 0; |
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| 61 | |||
| 62 | while (i < MAX_PARTITION && p == NULL) { |
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| 63 | if (mem_table[i].used && (mem_table[i].size >= s)) |
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| 64 | p = mem_table[i].addr; |
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| 65 | else |
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| 66 | i++; |
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| 67 | } |
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| 68 | if (p != NULL) { |
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| 69 | if (mem_table[i].size > s) { |
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| 70 | mem_table[i].size -= s; |
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| 71 | mem_table[i].addr += s; |
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| 72 | } else |
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| 73 | mem_table[i].used = FALSE; |
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| 74 | } |
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| 75 | return (p); |
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| 76 | } |
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| 77 | |||
| 78 | WORD ll_free(void *p, DWORD s) |
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| 79 | { |
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| 80 | register int i = 1; |
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| 81 | unsigned i1 = 0, i2 = 0; |
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| 82 | |||
| 83 | while (i < MAX_PARTITION && ((i1 == 0) || (i2 == 0))) { |
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| 84 | if (mem_table[i].used) { |
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| 85 | if (mem_table[i].addr + mem_table[i].size == p) |
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| 86 | i1 = i; |
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| 87 | if (mem_table[i].addr == (BYTE *) (p) + s) |
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| 88 | i2 = i; |
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| 89 | } |
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| 90 | i++; |
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| 91 | } |
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| 92 | if (i1 != 0 && i2 != 0) { |
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| 93 | mem_table[i1].size += mem_table[i2].size + s; |
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| 94 | mem_table[i2].used = FALSE; |
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| 95 | } else if (i1 == 0 && i2 != 0) { |
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| 96 | mem_table[i2].addr = p; |
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| 97 | mem_table[i2].size += s; |
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| 98 | } else if (i1 != 0 && i2 == 0) |
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| 99 | mem_table[i1].size += s; |
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| 100 | else { |
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| 101 | i = 0; |
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| 102 | while (i < MAX_PARTITION && (mem_table[i].used == TRUE)) |
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| 103 | i++; |
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| 104 | if (i == MAX_PARTITION) |
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| 105 | return (FALSE); |
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| 106 | mem_table[i].addr = p; |
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| 107 | mem_table[i].size = s; |
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| 108 | mem_table[i].used = TRUE; |
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| 109 | } |
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| 110 | return (TRUE); |
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| 111 | } |
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| 112 | |||
| 113 | void ll_mem_dump(void) |
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| 114 | { |
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| 115 | register int i; |
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| 116 | for (i = 0; i < MAX_PARTITION; i++) { |
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| 117 | if (mem_table[i].used) |
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| 118 | message("Entry : [%d] Addr : %p Size : %ld\n", i, |
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| 119 | mem_table[i].addr, mem_table[i].size); |
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| 120 | } |
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| 121 | } |