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Rev | Author | Line No. | Line |
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2288 | clevermous | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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9715 | Doczom | 3 | ;; Copyright (C) KolibriOS team 2004-2022. All rights reserved. ;; |
2288 | clevermous | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | $Revision: 9899 $ |
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9 | |||
10 | align 4 |
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11 | proc mem_test |
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12 | ; if we have BIOS with fn E820, skip the test |
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8217 | dunkaist | 13 | cmp [BOOT_LO.memmap_block_cnt], 0 |
2288 | clevermous | 14 | jnz .ret |
15 | |||
16 | mov eax, cr0 |
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9715 | Doczom | 17 | and eax, not (CR0_CD + CR0_NW) |
2288 | clevermous | 18 | or eax, CR0_CD ;disable caching |
19 | mov cr0, eax |
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20 | wbinvd ;invalidate cache |
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21 | |||
22 | xor edi, edi |
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23 | mov ebx, 'TEST' |
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24 | @@: |
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25 | add edi, 0x100000 |
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26 | xchg ebx, dword [edi] |
||
27 | cmp dword [edi], 'TEST' |
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28 | xchg ebx, dword [edi] |
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29 | je @b |
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30 | |||
9715 | Doczom | 31 | and eax, not (CR0_CD + CR0_NW) ;enable caching |
2288 | clevermous | 32 | mov cr0, eax |
7132 | dunkaist | 33 | inc dword [BOOT_LO.memmap_block_cnt] |
2288 | clevermous | 34 | xor eax, eax |
9715 | Doczom | 35 | mov [BOOT_LO.memmap_blocks + e820entry.addr.lo], eax |
36 | mov [BOOT_LO.memmap_blocks + e820entry.addr.hi], eax |
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37 | mov [BOOT_LO.memmap_blocks + e820entry.size.lo], edi |
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38 | mov [BOOT_LO.memmap_blocks + e820entry.size.hi], eax |
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4390 | clevermous | 39 | inc eax |
9715 | Doczom | 40 | mov [BOOT_LO.memmap_blocks + e820entry.type], eax |
2288 | clevermous | 41 | .ret: |
42 | ret |
||
43 | endp |
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44 | |||
45 | align 4 |
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46 | proc init_mem |
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47 | ; calculate maximum allocatable address and number of allocatable pages |
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7132 | dunkaist | 48 | mov edi, BOOT_LO.memmap_blocks |
8217 | dunkaist | 49 | mov ecx, [edi-4] ; memmap_block_cnt |
2288 | clevermous | 50 | xor esi, esi; esi will hold total amount of memory |
51 | xor edx, edx; edx will hold maximum allocatable address |
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52 | .calcmax: |
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53 | ; round all to pages |
||
9715 | Doczom | 54 | mov eax, [edi + e820entry.addr.lo] |
55 | cmp byte [edi + e820entry.type], 1 |
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2466 | Serge | 56 | jne .unusable |
57 | |||
9899 | dunkaist | 58 | test eax, PAGE_SIZE-1 |
2288 | clevermous | 59 | jz @f |
60 | neg eax |
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9899 | dunkaist | 61 | and eax, PAGE_SIZE-1 |
9715 | Doczom | 62 | add [edi + e820entry.addr.lo], eax |
63 | adc [edi + e820entry.addr.hi], 0 |
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64 | sub [edi + e820entry.size.lo], eax |
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65 | sbb [edi + e820entry.size.hi], 0 |
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2288 | clevermous | 66 | jc .unusable |
67 | @@: |
||
9899 | dunkaist | 68 | and [edi + e820entry.size.lo], -PAGE_SIZE |
2288 | clevermous | 69 | jz .unusable |
8217 | dunkaist | 70 | ; ignore memory after 4 GiB |
9715 | Doczom | 71 | cmp [edi + e820entry.addr.hi], 0 |
2288 | clevermous | 72 | jnz .unusable |
9715 | Doczom | 73 | mov eax, [edi + e820entry.addr.lo] |
74 | cmp [edi + e820entry.size.hi], 0 |
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2288 | clevermous | 75 | jnz .overflow |
9715 | Doczom | 76 | add eax, [edi + e820entry.size.lo] |
2288 | clevermous | 77 | jnc @f |
78 | .overflow: |
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9899 | dunkaist | 79 | mov eax, -PAGE_SIZE |
2288 | clevermous | 80 | @@: |
81 | cmp edx, eax |
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82 | jae @f |
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83 | mov edx, eax |
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84 | @@: |
||
9715 | Doczom | 85 | sub eax, [edi + e820entry.addr.lo] |
86 | mov [edi + e820entry.size.lo], eax |
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2288 | clevermous | 87 | add esi, eax |
88 | jmp .usable |
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89 | .unusable: |
||
8217 | dunkaist | 90 | ; and dword [edi+e820entry.size.lo], 0 |
2288 | clevermous | 91 | .usable: |
8217 | dunkaist | 92 | add edi, sizeof.e820entry |
2288 | clevermous | 93 | loop .calcmax |
94 | .calculated: |
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9715 | Doczom | 95 | mov [MEM_AMOUNT - OS_BASE], esi |
96 | mov [pg_data.mem_amount - OS_BASE], esi |
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2288 | clevermous | 97 | shr esi, 12 |
9715 | Doczom | 98 | mov [pg_data.pages_count - OS_BASE], esi |
2288 | clevermous | 99 | |
100 | shr edx, 12 |
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101 | add edx, 31 |
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102 | and edx, not 31 |
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103 | shr edx, 3 |
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9715 | Doczom | 104 | mov [pg_data.pagemap_size - OS_BASE], edx |
2288 | clevermous | 105 | |
9899 | dunkaist | 106 | add edx, (sys_pgmap - OS_BASE)+PAGE_SIZE-1 |
107 | and edx, -PAGE_SIZE |
||
2288 | clevermous | 108 | mov [tmp_page_tabs], edx |
109 | |||
110 | mov edx, esi |
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111 | and edx, -1024 |
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9899 | dunkaist | 112 | cmp edx, (OS_BASE/PAGE_SIZE) |
2288 | clevermous | 113 | jbe @F |
9899 | dunkaist | 114 | mov edx, (OS_BASE/PAGE_SIZE) |
2288 | clevermous | 115 | jmp .set |
116 | @@: |
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9899 | dunkaist | 117 | cmp edx, (HEAP_BASE - OS_BASE + HEAP_MIN_SIZE)/PAGE_SIZE |
2288 | clevermous | 118 | jae .set |
9899 | dunkaist | 119 | mov edx, (HEAP_BASE - OS_BASE + HEAP_MIN_SIZE)/PAGE_SIZE |
2288 | clevermous | 120 | .set: |
9715 | Doczom | 121 | mov [pg_data.kernel_pages - OS_BASE], edx |
2288 | clevermous | 122 | shr edx, 10 |
9715 | Doczom | 123 | mov [pg_data.kernel_tables - OS_BASE], edx |
2288 | clevermous | 124 | |
125 | xor eax, eax |
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9715 | Doczom | 126 | mov edi, sys_proc - OS_BASE |
9899 | dunkaist | 127 | mov ecx, 2*PAGE_SIZE/4 |
2288 | clevermous | 128 | cld |
129 | rep stosd |
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130 | |||
9899 | dunkaist | 131 | mov edx, (sys_proc - OS_BASE + PROC.pdt_0) + (OS_BASE shr 20) |
9715 | Doczom | 132 | bt [cpu_caps - OS_BASE], CAPS_PSE |
2288 | clevermous | 133 | jnc .no_PSE |
134 | |||
135 | mov ebx, cr4 |
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136 | or ebx, CR4_PSE |
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9715 | Doczom | 137 | mov eax, PDE_LARGE + PG_SWR |
2288 | clevermous | 138 | mov cr4, ebx |
9715 | Doczom | 139 | dec [pg_data.kernel_tables - OS_BASE] |
2288 | clevermous | 140 | |
141 | mov [edx], eax |
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142 | add edx, 4 |
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143 | |||
144 | mov edi, [tmp_page_tabs] |
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145 | jmp .map_kernel_heap ; new kernel fits to the first 4Mb - nothing to do with ".map_low" |
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146 | .no_PSE: |
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5356 | serge | 147 | mov eax, PG_SWR |
2288 | clevermous | 148 | mov ecx, [tmp_page_tabs] |
149 | shr ecx, 12 |
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150 | .map_low: |
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151 | mov edi, [tmp_page_tabs] |
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152 | @@: ; |
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153 | stosd |
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9899 | dunkaist | 154 | add eax, PAGE_SIZE |
2288 | clevermous | 155 | dec ecx |
156 | jnz @B |
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157 | |||
158 | .map_kernel_heap: |
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9715 | Doczom | 159 | mov ecx, [pg_data.kernel_tables - OS_BASE] |
2288 | clevermous | 160 | shl ecx, 10 |
161 | xor eax, eax |
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162 | rep stosd |
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163 | |||
9715 | Doczom | 164 | mov ecx, [pg_data.kernel_tables - OS_BASE] |
2288 | clevermous | 165 | mov eax, [tmp_page_tabs] |
5356 | serge | 166 | or eax, PG_SWR |
2288 | clevermous | 167 | mov edi, edx |
168 | |||
169 | .map_kernel_tabs: |
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170 | stosd |
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9899 | dunkaist | 171 | add eax, PAGE_SIZE |
2288 | clevermous | 172 | dec ecx |
173 | jnz .map_kernel_tabs |
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174 | |||
5356 | serge | 175 | mov dword [sys_proc-OS_BASE+PROC.pdt_0+(page_tabs shr 20)], sys_proc+PROC.pdt_0+PG_SWR-OS_BASE |
2288 | clevermous | 176 | |
9715 | Doczom | 177 | mov edi, (sys_proc + PROC.pdt_0 - OS_BASE) |
178 | lea esi, [edi + (OS_BASE shr 20)] |
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2288 | clevermous | 179 | movsd |
180 | movsd |
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181 | ret |
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182 | endp |
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183 | |||
184 | align 4 |
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185 | proc init_page_map |
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186 | ; mark all memory as unavailable |
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9715 | Doczom | 187 | mov edi, sys_pgmap - OS_BASE |
188 | mov ecx, [pg_data.pagemap_size - OS_BASE] |
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2288 | clevermous | 189 | shr ecx, 2 |
190 | xor eax, eax |
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191 | cld |
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192 | rep stosd |
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193 | |||
194 | ; scan through memory map and mark free areas as available |
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7132 | dunkaist | 195 | mov ebx, BOOT_LO.memmap_blocks |
2288 | clevermous | 196 | mov edx, [ebx-4] |
197 | .scanmap: |
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9715 | Doczom | 198 | cmp byte [ebx + e820entry.type], 1 |
2466 | Serge | 199 | jne .next |
200 | |||
9715 | Doczom | 201 | mov ecx, [ebx + e820entry.size.lo] |
2288 | clevermous | 202 | shr ecx, 12; ecx = number of pages |
203 | jz .next |
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9715 | Doczom | 204 | mov edi, [ebx + e820entry.addr.lo] |
2288 | clevermous | 205 | shr edi, 12; edi = first page |
206 | mov eax, edi |
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207 | shr edi, 5 |
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208 | shl edi, 2 |
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9715 | Doczom | 209 | add edi, sys_pgmap - OS_BASE |
2288 | clevermous | 210 | and eax, 31 |
211 | jz .startok |
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212 | add ecx, eax |
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213 | sub ecx, 32 |
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214 | jbe .onedword |
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215 | push ecx |
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216 | mov ecx, eax |
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217 | or eax, -1 |
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218 | shl eax, cl |
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219 | or [edi], eax |
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220 | add edi, 4 |
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221 | pop ecx |
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222 | .startok: |
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223 | push ecx |
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224 | shr ecx, 5 |
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225 | or eax, -1 |
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226 | rep stosd |
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227 | pop ecx |
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228 | and ecx, 31 |
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229 | neg eax |
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230 | shl eax, cl |
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231 | dec eax |
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232 | or [edi], eax |
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233 | jmp .next |
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234 | .onedword: |
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235 | add ecx, 32 |
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236 | sub ecx, eax |
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237 | @@: |
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238 | bts [edi], eax |
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239 | inc eax |
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240 | loop @b |
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241 | .next: |
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8217 | dunkaist | 242 | add ebx, sizeof.e820entry |
2288 | clevermous | 243 | dec edx |
244 | jnz .scanmap |
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245 | |||
246 | ; mark kernel memory as allocated (unavailable) |
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247 | mov ecx, [tmp_page_tabs] |
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9715 | Doczom | 248 | mov edx, [pg_data.pages_count - OS_BASE] |
2288 | clevermous | 249 | shr ecx, 12 |
9715 | Doczom | 250 | add ecx, [pg_data.kernel_tables - OS_BASE] |
2288 | clevermous | 251 | sub edx, ecx |
9715 | Doczom | 252 | mov [pg_data.pages_free - OS_BASE], edx |
2288 | clevermous | 253 | |
9715 | Doczom | 254 | mov edi, sys_pgmap - OS_BASE |
2288 | clevermous | 255 | mov ebx, ecx |
256 | shr ecx, 5 |
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257 | xor eax, eax |
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258 | rep stosd |
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259 | |||
260 | not eax |
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261 | mov ecx, ebx |
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262 | and ecx, 31 |
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263 | shl eax, cl |
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264 | and [edi], eax |
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265 | add edi, OS_BASE |
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9715 | Doczom | 266 | mov [page_start - OS_BASE], edi; |
2288 | clevermous | 267 | |
268 | mov ebx, sys_pgmap |
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9715 | Doczom | 269 | add ebx, [pg_data.pagemap_size - OS_BASE] |
270 | mov [page_end - OS_BASE], ebx |
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2288 | clevermous | 271 | |
272 | ret |
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273 | endp |
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274 | |||
275 | align 4 |
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276 | |||
277 | init_BIOS32: |
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278 | mov edi, 0xE0000 |
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279 | .pcibios_nxt: |
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280 | cmp dword[edi], '_32_'; "magic" word |
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281 | je .BIOS32_found |
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282 | .pcibios_nxt2: |
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283 | add edi, 0x10 |
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284 | cmp edi, 0xFFFF0 |
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285 | je .BIOS32_not_found |
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286 | jmp .pcibios_nxt |
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287 | .BIOS32_found: ; magic word found, check control summ |
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288 | |||
289 | movzx ecx, byte[edi + 9] |
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290 | shl ecx, 4 |
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291 | mov esi, edi |
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292 | xor eax, eax |
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293 | cld ; paranoia |
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294 | @@: |
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295 | lodsb |
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296 | add ah, al |
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297 | loop @b |
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298 | jnz .pcibios_nxt2; control summ must be zero |
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299 | ; BIOS32 service found ! |
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300 | mov ebp, [edi + 4] |
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301 | mov [bios32_entry], ebp |
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302 | ; check PCI BIOS present |
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303 | mov eax, '$PCI' |
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304 | xor ebx, ebx |
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305 | push cs ; special for 'ret far' from BIOS |
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306 | call ebp |
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307 | test al, al |
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308 | jnz .PCI_BIOS32_not_found |
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309 | |||
8052 | rgimad | 310 | ; descriptors for PCI BIOS are created here |
2288 | clevermous | 311 | |
312 | add ebx, OS_BASE |
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313 | dec ecx |
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9715 | Doczom | 314 | mov [(pci_code_32 - OS_BASE)], cx ;limit 0-15 |
315 | mov [(pci_data_32 - OS_BASE)], cx ;limit 0-15 |
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2288 | clevermous | 316 | |
9715 | Doczom | 317 | mov [(pci_code_32 - OS_BASE)+2], bx ;base 0-15 |
318 | mov [(pci_data_32 - OS_BASE)+2], bx ;base 0-15 |
||
2288 | clevermous | 319 | |
320 | shr ebx, 16 |
||
9715 | Doczom | 321 | mov [(pci_code_32 - OS_BASE)+4], bl ;base 16-23 |
322 | mov [(pci_data_32 - OS_BASE)+4], bl ;base 16-23 |
||
2288 | clevermous | 323 | |
324 | shr ecx, 16 |
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325 | and cl, 0x0F |
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326 | mov ch, bh |
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327 | add cx, D32 |
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9715 | Doczom | 328 | mov [(pci_code_32 - OS_BASE)+6], cx ;lim 16-19 & |
329 | mov [(pci_data_32 - OS_BASE)+6], cx ;base 24-31 |
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2288 | clevermous | 330 | |
9715 | Doczom | 331 | mov [(pci_bios_entry - OS_BASE)], edx |
2288 | clevermous | 332 | ; jmp .end |
333 | .PCI_BIOS32_not_found: |
||
8052 | rgimad | 334 | ; pci_emu_dat structure should be filled here |
2288 | clevermous | 335 | .BIOS32_not_found: |
336 | .end: |
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337 | ret |
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338 | |||
339 | align 4 |
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340 | proc test_cpu |
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341 | locals |
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342 | cpu_type dd ? |
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343 | endl |
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344 | |||
345 | xor eax, eax |
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346 | mov [cpu_type], eax |
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9715 | Doczom | 347 | mov [cpu_caps - OS_BASE], eax |
348 | mov [cpu_caps + 4 - OS_BASE], eax |
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349 | mov [cpu_phys_addr_width - OS_BASE], 32 |
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2288 | clevermous | 350 | |
351 | pushfd |
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352 | pop eax |
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353 | mov ecx, eax |
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7126 | dunkaist | 354 | xor eax, EFLAGS_AC |
2288 | clevermous | 355 | push eax |
356 | popfd |
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357 | pushfd |
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358 | pop eax |
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359 | xor eax, ecx |
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360 | mov [cpu_type], CPU_386 |
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361 | jz .end_cpuid |
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362 | push ecx |
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363 | popfd |
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364 | |||
365 | mov [cpu_type], CPU_486 |
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366 | mov eax, ecx |
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7126 | dunkaist | 367 | xor eax, EFLAGS_ID |
2288 | clevermous | 368 | push eax |
369 | popfd |
||
370 | pushfd |
||
371 | pop eax |
||
372 | xor eax, ecx |
||
373 | je .end_cpuid |
||
374 | |||
375 | xor eax, eax |
||
376 | cpuid |
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377 | |||
9715 | Doczom | 378 | mov [cpu_vendor - OS_BASE], ebx |
379 | mov [cpu_vendor + 4 - OS_BASE], edx |
||
380 | mov [cpu_vendor + 8 - OS_BASE], ecx |
||
4593 | clevermous | 381 | |
2288 | clevermous | 382 | cmp eax, 1 |
383 | jl .end_cpuid |
||
384 | mov eax, 1 |
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385 | cpuid |
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9715 | Doczom | 386 | mov [cpu_sign - OS_BASE], eax |
387 | mov [cpu_info - OS_BASE], ebx |
||
388 | mov [cpu_caps - OS_BASE], edx |
||
389 | mov [cpu_caps + 4 - OS_BASE], ecx |
||
2288 | clevermous | 390 | |
4593 | clevermous | 391 | bt edx, CAPS_PAE |
392 | jnc @f |
||
9715 | Doczom | 393 | mov [cpu_phys_addr_width - OS_BASE], 36 |
4593 | clevermous | 394 | @@: |
395 | mov eax, 0x80000000 |
||
396 | cpuid |
||
397 | cmp eax, 0x80000008 |
||
398 | jb @f |
||
399 | mov eax, 0x80000008 |
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400 | cpuid |
||
9715 | Doczom | 401 | mov [cpu_phys_addr_width - OS_BASE], al |
4593 | clevermous | 402 | @@: |
403 | |||
9715 | Doczom | 404 | mov eax, [cpu_sign - OS_BASE] |
2288 | clevermous | 405 | shr eax, 8 |
406 | and eax, 0x0f |
||
407 | ret |
||
408 | .end_cpuid: |
||
409 | mov eax, [cpu_type] |
||
410 | ret |
||
411 | endp |
||
412 | |||
7136 | dunkaist | 413 | ACPI_HI_RSDP_WINDOW_START = 0x000E0000 |
414 | ACPI_HI_RSDP_WINDOW_END = 0x00100000 |
||
415 | ACPI_RSDP_CHECKSUM_LENGTH = 20 |
||
5787 | serge | 416 | |
8111 | dunkaist | 417 | proc acpi_locate_tables uses ebx esi edi |
9715 | Doczom | 418 | mov ebx, [ebx + ACPI_RSDP.RsdtAddress] |
419 | mov [acpi_rsdt_base - OS_BASE], ebx |
||
420 | mov eax, [ebx + ACPI_RSDT.Length] |
||
421 | mov [acpi_rsdt_size - OS_BASE], eax |
||
2288 | clevermous | 422 | |
9715 | Doczom | 423 | mov esi, [acpi_rsdt_base - OS_BASE] |
424 | mov ecx, [esi + ACPI_RSDT.Length] |
||
425 | lea edi, [esi + ecx] |
||
8111 | dunkaist | 426 | add esi, sizeof.ACPI_TABLE |
427 | movi ecx, 1 |
||
428 | .next_table: |
||
429 | cmp esi, edi |
||
430 | jae .done |
||
431 | lodsd |
||
432 | cmp [eax+ACPI_TABLE.Signature], 'SSDT' ; skip DSDT if present |
||
433 | jz .ssdt ; read it from FADT |
||
434 | cmp [eax+ACPI_TABLE.Signature], 'FACP' ; this is FADT |
||
435 | jz .fadt |
||
436 | cmp [eax+ACPI_TABLE.Signature], 'APIC' ; this is MADT |
||
437 | jz .madt |
||
438 | cmp [eax+ACPI_TABLE.Signature], 'HPET' |
||
439 | jz .hpet |
||
440 | jmp .next_table |
||
441 | .ssdt: |
||
9715 | Doczom | 442 | mov [acpi_ssdt_base + ecx*4 - OS_BASE], eax |
8111 | dunkaist | 443 | mov eax, [eax+ACPI_TABLE.Length] |
9715 | Doczom | 444 | mov [acpi_ssdt_size + ecx*4 - OS_BASE], eax |
8111 | dunkaist | 445 | inc ecx |
446 | jmp .next_table |
||
447 | .fadt: |
||
9715 | Doczom | 448 | mov [acpi_fadt_base - OS_BASE], eax |
449 | cmp [eax + ACPI_FADT.DSDT], 0 |
||
8111 | dunkaist | 450 | jz @f |
9715 | Doczom | 451 | mov edx, [eax + ACPI_FADT.DSDT] |
452 | mov [acpi_ssdt_base - OS_BASE], edx |
||
453 | mov edx, [edx + ACPI_TABLE.Length] |
||
454 | mov [acpi_ssdt_size - OS_BASE], edx |
||
8111 | dunkaist | 455 | @@: |
9715 | Doczom | 456 | mov eax, [eax + ACPI_TABLE.Length] |
457 | mov [acpi_fadt_size - OS_BASE], eax |
||
8111 | dunkaist | 458 | jmp .next_table |
459 | .madt: |
||
9715 | Doczom | 460 | mov [acpi_madt_base - OS_BASE], eax |
461 | mov eax, [eax + ACPI_TABLE.Length] |
||
462 | mov [acpi_madt_size - OS_BASE], eax |
||
8111 | dunkaist | 463 | jmp .next_table |
464 | .hpet: |
||
9715 | Doczom | 465 | mov [acpi_hpet_base - OS_BASE], eax |
466 | mov eax, [eax + ACPI_TABLE.Length] |
||
467 | mov [acpi_hpet_size - OS_BASE], eax |
||
8111 | dunkaist | 468 | jmp .next_table |
469 | .done: |
||
9715 | Doczom | 470 | mov [acpi_ssdt_cnt - OS_BASE], ecx |
8111 | dunkaist | 471 | ret |
472 | endp |
||
2288 | clevermous | 473 | |
474 | acpi_locate: |
||
475 | push ebx |
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6244 | serge | 476 | push edi |
477 | |||
7130 | dunkaist | 478 | if defined UEFI |
479 | ; UEFI loader knows where RSDP is |
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7132 | dunkaist | 480 | mov ebx, [BOOT_LO.acpi_rsdp] |
7130 | dunkaist | 481 | test ebx, ebx |
482 | jz .done |
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483 | call .check |
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484 | else |
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6244 | serge | 485 | movzx ebx, word [0x40E] |
486 | shl ebx, 4 |
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487 | lea ecx, [ebx+1024] |
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488 | call .check |
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489 | |||
490 | test ebx, ebx |
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491 | jz @F |
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492 | jmp .done |
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493 | |||
494 | @@: |
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2288 | clevermous | 495 | mov ebx, ACPI_HI_RSDP_WINDOW_START |
6244 | serge | 496 | mov edi, ACPI_HI_RSDP_WINDOW_END |
497 | call .check |
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7130 | dunkaist | 498 | end if |
6244 | serge | 499 | .done: |
9715 | Doczom | 500 | mov [acpi_rsdp_base - OS_BASE], ebx |
8111 | dunkaist | 501 | test ebx, ebx |
502 | jz @f |
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503 | call acpi_locate_tables |
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504 | @@: |
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6244 | serge | 505 | pop edi |
506 | pop ebx |
||
507 | ret |
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508 | |||
2288 | clevermous | 509 | .check: |
7122 | dunkaist | 510 | cmp [ebx], dword 'RSD ' |
2288 | clevermous | 511 | jne .next |
7122 | dunkaist | 512 | cmp [ebx+4], dword 'PTR ' |
2288 | clevermous | 513 | jne .next |
514 | |||
515 | mov edx, ebx |
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516 | mov ecx, ACPI_RSDP_CHECKSUM_LENGTH |
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517 | xor eax, eax |
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518 | .sum: |
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519 | add al, [edx] |
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520 | inc edx |
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521 | loop .sum |
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522 | |||
523 | test al, al |
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524 | jnz .next |
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525 | ret |
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526 | .next: |
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527 | add ebx, 16 |
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6244 | serge | 528 | cmp ebx, edi |
2288 | clevermous | 529 | jb .check |
6244 | serge | 530 | xor ebx, ebx |
2288 | clevermous | 531 | ret |