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Rev | Author | Line No. | Line |
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180 | heavyiron | 1 | if ~ used memalloc_inc |
2 | memalloc_inc_fix: |
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3 | memalloc_inc fix memalloc_inc_fix |
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4 | ;kglobals.inc required. |
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5 | ;multithread: ;uncomment this for thread-safe version |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | ;; Memory allocator for MenuetOS ;; |
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8 | ;; Halyavin Andrey halyavin@land.ru, 2006 ;; |
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9 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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10 | |||
11 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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12 | ;; allocated mem block structure ;; |
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13 | ;; +0: bit 0 - used flag ;; |
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14 | ;; bits 31..1 - block size ;; |
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15 | ;; +4: address of prev block ;; |
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16 | ;; +8 .. +(blocksize) - allocated memory ;; |
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17 | ;; +(blocksize) - next block ;; |
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18 | ;; ;; |
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19 | ;; free mem block structure ;; |
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20 | ;; +0: bit 0 - used flag ;; |
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21 | ;; bits 31..1 - block size ;; |
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22 | ;; +4: address of prev block ;; |
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23 | ;; +8: prev free block ;; |
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24 | ;; +12: next free block ;; |
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25 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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26 | memblock.size=0 |
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27 | memblock.prevblock=4 |
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28 | memblock.prevfreeblock=8 |
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29 | memblock.nextfreeblock=12 |
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30 | uglobal |
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31 | heapsmallblocks rd 1 |
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32 | heapstart rd 1 |
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33 | heapend rd 1 |
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34 | heapfreelist rd 1 |
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35 | heapmutex rd 1 |
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36 | heaplastblock rd 1 |
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37 | endg |
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38 | |||
39 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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40 | ;; mf_init ;; |
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41 | ;; Initialize memory map for dynamic use ;; |
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42 | ;; input: eax: starting address or 0 ;; |
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43 | ;; output: none ;; |
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44 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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45 | mf_init: |
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46 | push ebx |
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47 | push ecx |
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48 | test eax,eax |
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49 | jnz .noautodet |
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50 | sub esp,1024 |
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51 | mov ebx,esp |
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52 | mov ecx,-1 |
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53 | mov eax,9 |
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54 | int 0x40 |
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55 | mov eax,[esp+26] |
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56 | add esp,1024 |
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57 | .noautodet: |
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58 | add eax,15 |
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59 | and eax,not 15 |
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60 | mov [heapsmallblocks],eax |
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61 | add eax,2048 |
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62 | mov [heapstart],eax |
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63 | mov [heapfreelist],eax |
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64 | mov [heaplastblock],eax |
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65 | |||
66 | mov ecx,eax |
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67 | if defined heapstartsize |
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68 | add ecx,heapstartsize |
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69 | else |
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70 | add ecx,4096 |
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71 | end if |
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72 | add ecx,4095 |
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73 | and ecx,not 4095 |
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74 | push eax |
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75 | mov eax,64 |
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76 | mov ebx,1 |
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77 | int 0x40 |
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78 | pop eax |
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79 | mov [eax+memblock.prevblock],dword 0 |
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80 | mov [heapend],ecx |
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81 | mov [eax+memblock.size],ecx |
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82 | sub [eax+memblock.size],eax |
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83 | xor ebx,ebx |
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84 | mov dword [eax+memblock.prevfreeblock],heapfreelist-memblock.nextfreeblock |
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85 | mov [eax+memblock.nextfreeblock],ebx |
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86 | mov [heapmutex],ebx |
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87 | push edi |
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88 | mov edi,[heapsmallblocks] |
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89 | mov ecx,512 |
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90 | xor eax,eax |
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91 | rep stosd |
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92 | pop edi |
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93 | pop ecx |
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94 | pop ebx |
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95 | ret |
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96 | |||
97 | if defined multithread |
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98 | heaplock: |
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99 | push eax |
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100 | push ebx |
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101 | mov eax,68 |
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102 | mov ebx,1 |
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103 | .loop: |
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104 | xchg eax,[heapmutex] |
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105 | test eax,eax |
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106 | jz .endloop |
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107 | int 0x40 ;change task |
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108 | jmp .loop |
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109 | .endloop: |
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110 | pop ebx |
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111 | pop eax |
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112 | ret |
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113 | |||
114 | heapunlock: |
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115 | mov [heapmutex],dword 0 |
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116 | ret |
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117 | end if |
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118 | |||
119 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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120 | ;; heap_split_block ;; |
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121 | ;; Split free block to allocated block and free one. ;; |
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122 | ;; input: ;; |
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123 | ;; eax - size of allocated block ;; |
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124 | ;; ebx - block ;; |
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125 | ;; output: ;; |
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126 | ;; eax - real size of allocated block ;; |
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127 | ;; ebx - pointer to new block ;; |
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128 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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129 | heap_split_block: |
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130 | push ecx |
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131 | mov ecx,[ebx+memblock.size] |
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132 | sub ecx,16 |
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133 | cmp ecx,eax |
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134 | jge .norm |
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135 | inc dword [ebx+memblock.size] |
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136 | mov eax,ecx |
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137 | xor ebx,ebx |
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138 | pop ecx |
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139 | ret |
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140 | .norm: |
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141 | add ecx,16 |
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142 | mov [ebx+memblock.size],eax |
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143 | inc dword [ebx+memblock.size] |
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144 | mov [ebx+eax+memblock.prevblock],ebx |
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145 | add ebx,eax |
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146 | sub ecx,eax |
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147 | mov [ebx+memblock.size],ecx |
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148 | mov ecx,eax |
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149 | mov eax,ebx |
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150 | call heap_fix_right |
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151 | mov eax,ecx |
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152 | pop ecx |
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153 | ret |
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154 | |||
155 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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156 | ;; heap_add_free_block ;; |
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157 | ;; Add free block to one of free block lists. ;; |
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158 | ;; input: ;; |
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159 | ;; eax - address of free block ;; |
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160 | ;; output: ;; |
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161 | ;; none ;; |
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162 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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163 | heap_add_free_block: |
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164 | cmp dword [eax+memblock.size],4096 |
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165 | push ebx |
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166 | jge .bigblock |
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167 | mov ebx,[eax+memblock.size] |
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168 | shr ebx,1 |
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169 | add ebx,[heapsmallblocks] |
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170 | push dword [ebx] |
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171 | pop dword [eax+memblock.nextfreeblock] |
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172 | mov [ebx],eax |
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173 | mov dword [eax+memblock.prevfreeblock],ebx |
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174 | sub dword [eax+memblock.prevfreeblock],memblock.nextfreeblock |
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175 | mov ebx,[eax+memblock.nextfreeblock] |
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176 | test ebx,ebx |
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177 | jz .no_next_block |
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178 | mov [ebx+memblock.prevfreeblock],eax |
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179 | .no_next_block: |
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180 | pop ebx |
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181 | ret |
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182 | .bigblock: |
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183 | mov ebx,[heapfreelist] |
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184 | mov [eax+memblock.nextfreeblock],ebx |
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185 | mov [heapfreelist],eax |
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186 | mov dword [eax+memblock.prevfreeblock],heapfreelist-memblock.nextfreeblock |
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187 | ; mov ebx,[eax+memblock.nextfreeblock] |
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188 | test ebx,ebx |
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189 | jz .no_next_big_block |
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190 | mov [ebx+memblock.prevfreeblock],eax |
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191 | .no_next_big_block: |
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192 | pop ebx |
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193 | ret |
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194 | |||
195 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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196 | ;; heap_remove_block ;; |
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197 | ;; Remove free block from the list of free blocks. ;; |
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198 | ;; input: ;; |
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199 | ;; eax - free block ;; |
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200 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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201 | heap_remove_block: |
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202 | push ebx |
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203 | push ecx |
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204 | mov ecx,[eax+memblock.prevfreeblock] |
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205 | mov ebx,[eax+memblock.nextfreeblock] |
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206 | mov [ecx+memblock.nextfreeblock],ebx |
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207 | test ebx,ebx |
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208 | jz .no_next_block |
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209 | mov [ebx+memblock.prevfreeblock],ecx |
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210 | .no_next_block: |
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211 | pop ecx |
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212 | pop ebx |
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213 | ret |
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214 | |||
215 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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216 | ;; mf_alloc |
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217 | ;; allocates a block of memory in heap |
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218 | ;; intput: eax: size of block |
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219 | ;; output: eax: address of allocated memory block or 0 if there's no mem. |
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220 | ;; allocator will not create new nodes that contain less that 8b of space, |
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221 | ;; and minimal allocation is actually 16 bytes - 8 for node and 8 for user. |
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222 | ;; allocator will never create non-aligned memory blocks. |
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223 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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224 | mf_alloc: |
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225 | test eax,eax |
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226 | jg .not_null ; test that we are not allocating null size block |
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227 | xor eax,eax |
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228 | ret |
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229 | .not_null: |
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230 | if defined multithread |
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231 | call heaplock |
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232 | end if |
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233 | push edi |
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234 | ; push edx |
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235 | push ecx |
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236 | push ebx |
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237 | add eax,7 |
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238 | and eax,not 7 ; make sure that block size is aligned |
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239 | |||
240 | lea edi,[eax+8] ; desired block size |
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241 | cmp edi,4096 |
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242 | jge .general_cycle |
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243 | |||
244 | mov ebx,[heapsmallblocks] |
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245 | xor ecx,ecx |
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246 | shr edi,1 |
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247 | |||
248 | .smallloop: |
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249 | cmp [ebx+edi],ecx |
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250 | jnz .smallblockfound |
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251 | add edi,4 |
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252 | cmp edi,2048 |
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253 | jl .smallloop |
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254 | lea edi,[eax+8] |
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255 | jmp .general_cycle |
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256 | |||
257 | .smallblockfound: |
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258 | lea ecx,[eax+8] |
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259 | mov eax,[ebx+edi] |
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260 | call heap_remove_block |
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261 | mov ebx,eax |
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262 | xchg eax,ecx |
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263 | call heap_split_block |
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264 | test ebx,ebx |
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265 | jz .perfect_small_block |
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266 | mov eax,ebx |
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267 | call heap_add_free_block |
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268 | .perfect_small_block: |
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269 | lea eax,[ecx+8] |
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270 | jmp .ret |
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271 | |||
272 | .general_cycle: |
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273 | ;edi - size needed |
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274 | mov eax,[heapfreelist] |
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275 | |||
276 | .loop: |
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277 | test eax,eax |
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278 | jz .new_mem |
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279 | cmp [eax+memblock.size],edi |
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280 | jge .blockfound |
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281 | mov eax,[eax+memblock.nextfreeblock] |
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282 | jmp .loop |
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283 | |||
284 | .blockfound: |
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285 | call heap_remove_block |
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286 | mov ebx,eax |
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287 | mov ecx,eax |
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288 | mov eax,edi |
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289 | call heap_split_block |
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290 | test ebx,ebx |
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291 | jz .perfect_block |
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292 | mov eax,ebx |
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293 | call heap_add_free_block |
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294 | .perfect_block: |
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295 | lea eax,[ecx+8] |
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296 | .ret: |
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297 | if defined multithread |
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298 | call heapunlock |
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299 | end if |
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300 | pop ebx |
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301 | pop ecx |
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302 | ; pop edx |
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303 | pop edi |
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304 | ret |
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305 | |||
306 | .new_mem: |
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307 | mov eax,edi |
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308 | add eax,4095 |
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309 | and eax,not 4095 |
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310 | mov ecx,[heapend] |
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311 | add [heapend],eax |
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312 | push eax |
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313 | mov eax,64 |
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314 | push ebx |
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315 | push ecx |
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316 | mov ecx,[heapend] |
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317 | mov ebx,1 |
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318 | int 0x40 |
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319 | pop ecx |
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320 | pop ebx |
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321 | pop eax |
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322 | mov [ecx+memblock.size],eax |
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323 | mov eax,[heaplastblock] |
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324 | mov [ecx+memblock.prevblock],eax |
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325 | mov [heaplastblock],ecx |
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326 | mov eax,ecx |
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327 | call heap_add_free_block |
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328 | jmp .general_cycle |
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329 | |||
330 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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331 | ;; heap_fix_right ;; |
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332 | ;; input: ;; |
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333 | ;; eax - pointer to free block ;; |
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334 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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335 | heap_fix_right: |
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336 | push ebx |
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337 | mov ebx,eax |
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338 | add ebx,[eax+memblock.size] |
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339 | cmp ebx,[heapend] |
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340 | jz .endblock |
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341 | mov [ebx+memblock.prevblock],eax |
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342 | pop ebx |
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343 | ret |
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344 | .endblock: |
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345 | mov [heaplastblock],eax |
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346 | pop ebx |
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347 | ret |
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348 | |||
349 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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350 | ;; heap_merge_left ;; |
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351 | ;; input: ;; |
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352 | ;; eax - pointer to free block ;; |
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353 | ;; output: ;; |
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354 | ;; eax - pointer to merged block ;; |
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355 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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356 | heap_merge_left: |
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357 | push ebx |
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358 | mov ebx,[eax+memblock.prevblock] |
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359 | test ebx,ebx |
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360 | jz .ret |
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361 | test byte [ebx+memblock.size],1 |
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362 | jnz .ret |
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363 | xchg eax,ebx |
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364 | call heap_remove_block |
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365 | mov ebx,[ebx+memblock.size] |
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366 | add [eax+memblock.size],ebx |
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367 | call heap_fix_right |
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368 | .ret: |
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369 | pop ebx |
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370 | ret |
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371 | |||
372 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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373 | ;; heap_merge_right ;; |
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374 | ;; input: ;; |
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375 | ;; eax - pointer to free block ;; |
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376 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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377 | heap_merge_right: |
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378 | push ebx |
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379 | mov ebx,eax |
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380 | add ebx,[eax+memblock.size] |
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381 | cmp ebx,[heapend] |
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382 | jz .ret |
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383 | test byte [ebx+memblock.size],1 |
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384 | jnz .ret |
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385 | xchg eax,ebx |
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386 | call heap_remove_block |
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387 | xchg eax,ebx |
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388 | mov ebx,[ebx+memblock.size] |
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389 | add [eax+memblock.size],ebx |
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390 | call heap_fix_right |
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391 | .ret: |
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392 | pop ebx |
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393 | ret |
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394 | |||
395 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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396 | ;; mf_free ;; |
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397 | ;; input: ;; |
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398 | ;; eax - pointer ;; |
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399 | ;; output: ;; |
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400 | ;; eax=1 - ok ;; |
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401 | ;; eax=0 - failed ;; |
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402 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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403 | mf_free: |
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404 | test eax,eax |
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405 | jnz .no_null |
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406 | inc eax |
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407 | ret |
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408 | .no_null: |
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409 | if defined multithread |
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410 | call heaplock |
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411 | end if |
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412 | sub eax,8 |
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413 | dec dword [eax+memblock.size] |
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414 | call heap_merge_left |
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415 | call heap_merge_right |
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416 | call heap_add_free_block |
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417 | .ret: |
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418 | if defined multithread |
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419 | call heapunlock |
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420 | end if |
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421 | ret |
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422 | |||
423 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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424 | ;; heap_try_reloc |
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425 | ;; input: |
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426 | ;; eax - address |
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427 | ;; ebx - new size |
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428 | ;; output: |
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429 | ;; ebx=1 - ok |
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430 | ;; ebx=0 - failed |
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431 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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432 | heap_try_reloc: |
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433 | push eax |
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434 | sub eax,8 |
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435 | add ebx,15 |
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436 | dec dword [eax+memblock.size] |
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437 | and ebx,not 7 |
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438 | cmp [eax+memblock.size],ebx |
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439 | jge .truncate |
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440 | push ebx |
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441 | mov ebx,eax |
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442 | add ebx,[eax+memblock.size] |
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443 | cmp ebx,[heapend] |
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444 | jz .fail ;todo: we can allocate new mem here |
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445 | test [ebx+memblock.size],byte 1 |
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446 | jnz .fail |
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447 | xchg eax,ebx |
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448 | call heap_remove_block |
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449 | mov eax,[eax+memblock.size] |
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450 | add [ebx+memblock.size],eax |
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451 | mov eax,ebx |
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452 | call heap_fix_right |
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453 | pop ebx |
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454 | .truncate: |
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455 | xchg eax,ebx |
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456 | call heap_split_block |
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457 | test ebx,ebx |
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458 | jz .no_last_block |
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459 | mov eax,ebx |
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460 | call heap_add_free_block |
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461 | call heap_merge_right |
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462 | .no_last_block: |
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463 | xor ebx,ebx |
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464 | pop eax |
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465 | inc ebx |
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466 | ret |
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467 | .fail: |
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468 | pop ebx |
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469 | xor ebx,ebx |
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470 | pop eax |
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471 | inc dword [eax-8+memblock.size] |
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472 | ret |
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473 | |||
474 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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475 | ;; mf_realloc |
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476 | ;; input: |
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477 | ;; eax - pointer |
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478 | ;; ebx - new size |
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479 | ;; output: |
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480 | ;; eax - new pointer |
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481 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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482 | mf_realloc: |
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483 | push ebx |
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484 | if defined multithread |
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485 | call heaplock |
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486 | end if |
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487 | call heap_try_reloc |
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488 | test ebx,ebx |
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489 | jnz .ret |
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490 | ;allocate new memory |
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491 | push eax |
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492 | mov eax,[esp+4] |
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493 | call mf_alloc |
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494 | test eax,eax |
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495 | jz .fail |
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496 | push esi |
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497 | push edi |
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498 | push ecx |
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499 | mov edi,eax |
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500 | mov esi,[esp+12] |
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501 | mov ecx,[esi-8+memblock.size] |
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502 | shr ecx,2 |
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503 | rep movsd |
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504 | pop ecx |
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505 | pop edi |
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506 | pop esi |
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507 | xchg eax,[esp] |
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508 | call mf_free |
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509 | .fail: |
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510 | pop eax |
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511 | .ret: |
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512 | if defined multithread |
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513 | call heapunlock |
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514 | end if |
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515 | pop ebx |
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516 | ret |
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517 | end if |