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| Rev 205 | Rev 316 | ||
|---|---|---|---|
| Line 52... | Line 52... | ||
| 52 | ## Turn paging on |
52 | ## Turn paging on |
| 53 | # |
53 | # |
| 54 | # Enable paging and write-back caching in CR0. |
54 | # Enable paging and write-back caching in CR0. |
| 55 | # |
55 | # |
| 56 | paging_on: |
56 | paging_on: |
| 57 | pushl %eax |
- | |
| 58 | movl %cr0,%eax |
57 | movl %cr0,%edx |
| 59 | orl $(1<<31),%eax # paging on |
58 | orl $(1<<31),%edx # paging on |
| 60 | andl $~((1<<30)|(1<<29)),%eax # clear Cache Disable and not Write Though |
59 | andl $~((1<<30)|(1<<29)),%edx # clear Cache Disable and not Write Though |
| 61 | movl %eax,%cr0 |
60 | movl %edx,%cr0 |
| 62 | jmp 0f |
61 | jmp 0f |
| 63 | 0: |
62 | 0: |
| 64 | popl %eax |
- | |
| 65 | ret |
63 | ret |
| 66 | 64 | ||
| 67 | 65 | ||
| 68 | ## Enable local APIC |
66 | ## Enable local APIC |
| 69 | # |
67 | # |
| 70 | # Enable local APIC in MSR. |
68 | # Enable local APIC in MSR. |
| 71 | # |
69 | # |
| 72 | enable_l_apic_in_msr: |
70 | enable_l_apic_in_msr: |
| 73 | pusha |
71 | push %eax |
| 74 | 72 | ||
| 75 | movl $0x1b, %ecx |
73 | movl $0x1b, %ecx |
| 76 | rdmsr |
74 | rdmsr |
| 77 | orl $(1<<11),%eax |
75 | orl $(1<<11),%eax |
| 78 | orl $(0xfee00000),%eax |
76 | orl $(0xfee00000),%eax |
| 79 | wrmsr |
77 | wrmsr |
| 80 | 78 | ||
| 81 | popa |
79 | pop %eax |
| 82 | ret |
80 | ret |
| 83 | 81 | ||
| 84 | 82 | ||
| 85 | ## Declare interrupt handlers |
83 | ## Declare interrupt handlers |
| 86 | # |
84 | # |
| Line 113... | Line 111... | ||
| 113 | pop %es |
111 | pop %es |
| 114 | pop %ds |
112 | pop %ds |
| 115 | 113 | ||
| 116 | 114 | ||
| 117 | # CLNT |
115 | # CLNT |
| 118 | pushfl; |
116 | pushfl |
| 119 | pop %eax; |
117 | pop %eax |
| 120 | and $0xFFFFBFFF,%eax; |
118 | and $0xFFFFBFFF,%eax |
| 121 | push %eax; |
119 | push %eax |
| 122 | popfl; |
120 | popfl |
| 123 | 121 | ||
| 124 | 122 | ||
| 125 | 123 | ||
| 126 | # Test if this is interrupt with error word or not |
124 | # Test if this is interrupt with error word or not |
| 127 | mov $\i,%cl; |
125 | mov $\i,%cl |
| 128 | movl $1,%eax; |
126 | movl $1,%eax |
| 129 | test $0xe0,%cl; |
127 | test $0xe0,%cl |
| 130 | jnz 0f; |
128 | jnz 0f |
| 131 | and $0x1f,%cl; |
129 | and $0x1f,%cl |
| 132 | shl %cl,%eax; |
130 | shl %cl,%eax |
| 133 | and $ERROR_WORD_INTERRUPT_LIST,%eax; |
131 | and $ERROR_WORD_INTERRUPT_LIST,%eax |
| 134 | jz 0f; |
132 | jz 0f |
| 135 | 133 | ||
| 136 | 134 | ||
| 137 | # Return with error word |
135 | # Return with error word |
| 138 | popa; |
136 | popa |
| 139 | pop %ebp; |
137 | pop %ebp |
| 140 | add $4,%esp; # Skip error word |
138 | add $4,%esp # Skip error word |
| 141 | iret; |
139 | iret |
| 142 | 140 | ||
| 143 | 0: |
141 | 0: |
| 144 | # Return with no error word |
142 | # Return with no error word |
| 145 | popa |
143 | popa |
| 146 | pop %ebp |
144 | pop %ebp |
| Line 165... | Line 163... | ||
| 165 | ## I/O input (byte) |
163 | ## I/O input (byte) |
| 166 | # |
164 | # |
| 167 | # Get a byte from I/O port and store it AL. |
165 | # Get a byte from I/O port and store it AL. |
| 168 | # |
166 | # |
| 169 | inb: |
167 | inb: |
| 170 | push %edx |
- | |
| 171 | xorl %eax,%eax |
168 | xorl %eax,%eax |
| 172 | movl 8(%esp),%edx |
169 | movl 4(%esp),%edx |
| 173 | inb %dx,%al |
170 | inb %dx,%al |
| 174 | pop %edx |
- | |
| 175 | ret |
171 | ret |
| 176 | 172 | ||
| 177 | 173 | ||
| 178 | ## I/O input (word) |
174 | ## I/O input (word) |
| 179 | # |
175 | # |
| 180 | # Get a word from I/O port and store it AX. |
176 | # Get a word from I/O port and store it AX. |
| 181 | # |
177 | # |
| 182 | inw: |
178 | inw: |
| 183 | push %edx |
- | |
| 184 | xorl %eax,%eax |
179 | xorl %eax,%eax |
| 185 | movl 8(%esp),%edx |
180 | movl 4(%esp),%edx |
| 186 | inw %dx,%ax |
181 | inw %dx,%ax |
| 187 | pop %edx |
- | |
| 188 | ret |
182 | ret |
| 189 | 183 | ||
| 190 | 184 | ||
| 191 | ## I/O input (dword) |
185 | ## I/O input (dword) |
| 192 | # |
186 | # |
| 193 | # Get a dword from I/O port and store it EAX. |
187 | # Get a dword from I/O port and store it EAX. |
| 194 | # |
188 | # |
| 195 | inl: |
189 | inl: |
| 196 | push %edx |
- | |
| 197 | xorl %eax,%eax |
190 | xorl %eax,%eax |
| 198 | movl 8(%esp),%edx |
191 | movl 4(%esp),%edx |
| 199 | inl %dx,%eax |
192 | inl %dx,%eax |
| 200 | pop %edx |
- | |
| 201 | ret |
193 | ret |
| 202 | 194 | ||
| 203 | 195 | ||
| 204 | ## I/O output (byte) |
196 | ## I/O output (byte) |
| 205 | # |
197 | # |
| 206 | # Send a byte to I/O port. |
198 | # Send a byte to I/O port. |
| 207 | # |
199 | # |
| 208 | outb: |
200 | outb: |
| 209 | push %ebp |
201 | push %eax |
| 210 | movl %esp,%ebp |
- | |
| 211 | pusha |
- | |
| 212 | 202 | ||
| 213 | movl 8(%ebp),%edx |
203 | movl 8(%esp),%edx |
| 214 | movl 12(%ebp),%eax |
204 | movl 12(%esp),%eax |
| 215 | outb %al,%dx |
205 | outb %al,%dx |
| 216 | 206 | ||
| 217 | popa |
- | |
| 218 | pop %ebp |
207 | pop %eax |
| 219 | ret |
208 | ret |
| 220 | 209 | ||
| 221 | 210 | ||
| 222 | ## I/O output (word) |
211 | ## I/O output (word) |
| 223 | # |
212 | # |
| 224 | # Send a word to I/O port. |
213 | # Send a word to I/O port. |
| 225 | # |
214 | # |
| 226 | outw: |
215 | outw: |
| 227 | push %ebp |
216 | push %eax |
| 228 | movl %esp,%ebp |
- | |
| 229 | pusha |
- | |
| 230 | 217 | ||
| 231 | movl 8(%ebp),%edx |
218 | movl 8(%esp),%edx |
| 232 | movl 12(%ebp),%eax |
219 | movl 12(%esp),%eax |
| 233 | outw %ax,%dx |
220 | outw %ax,%dx |
| 234 | 221 | ||
| 235 | popa |
- | |
| 236 | pop %ebp |
222 | pop %eax |
| 237 | ret |
223 | ret |
| 238 | 224 | ||
| 239 | 225 | ||
| 240 | ## I/O output (dword) |
226 | ## I/O output (dword) |
| 241 | # |
227 | # |
| 242 | # Send a dword to I/O port. |
228 | # Send a dword to I/O port. |
| 243 | # |
229 | # |
| 244 | outl: |
230 | outl: |
| 245 | push %ebp |
231 | push %eax |
| 246 | movl %esp,%ebp |
- | |
| 247 | pusha |
- | |
| 248 | 232 | ||
| 249 | movl 8(%ebp),%edx |
233 | movl 8(%esp),%edx |
| 250 | movl 12(%ebp),%eax |
234 | movl 12(%esp),%eax |
| 251 | outl %eax,%dx |
235 | outl %eax,%dx |
| 252 | 236 | ||
| 253 | popa |
- | |
| 254 | pop %ebp |
237 | pop %eax |
| 255 | ret |
238 | ret |
| 256 | 239 | ||
| 257 | 240 | ||
| 258 | ## Copy memory |
241 | ## Copy memory |
| 259 | # |
242 | # |
| 260 | # Copy a given number of bytes (3rd argument) |
243 | # Copy a given number of bytes (3rd argument) |
| 261 | # from the memory location defined by 2nd argument |
244 | # from the memory location defined by 2nd argument |
| 262 | # to the memory location defined by 1st argument. |
245 | # to the memory location defined by 1st argument. |
| 263 | # The memory areas cannot overlap. |
246 | # The memory areas cannot overlap. |
| 264 | # |
247 | # |
| 265 | SRC=12 |
248 | SRC=16 |
| 266 | DST=8 |
249 | DST=12 |
| 267 | CNT=16 |
250 | CNT=20 |
| 268 | memcpy: |
251 | memcpy: |
| 269 | push %ebp |
252 | push %esi |
| 270 | movl %esp,%ebp |
- | |
| 271 | pusha |
253 | push %edi |
| 272 | 254 | ||
| 273 | cld |
- | |
| 274 | movl CNT(%ebp),%ecx |
255 | movl CNT(%esp),%ecx |
| 275 | movl DST(%ebp),%edi |
256 | movl DST(%esp),%edi |
| 276 | movl SRC(%ebp),%esi |
257 | movl SRC(%esp),%esi |
| 277 | 258 | ||
| 278 | rep movsb %ds:(%esi),%es:(%edi) |
259 | rep movsb %ds:(%esi),%es:(%edi) |
| 279 | 260 | ||
| 280 | popa |
261 | pop %edi |
| 281 | pop %ebp |
262 | pop %esi |
| 282 | ret |
263 | ret |
| 283 | 264 | ||
| 284 | 265 | ||
| 285 | ## Fill memory with bytes |
266 | ## Fill memory with bytes |
| 286 | # |
267 | # |
| 287 | # Fill a given number of bytes (2nd argument) |
268 | # Fill a given number of bytes (2nd argument) |
| 288 | # at memory defined by 1st argument with the |
269 | # at memory defined by 1st argument with the |
| 289 | # byte value defined by 3rd argument. |
270 | # byte value defined by 3rd argument. |
| 290 | # |
271 | # |
| 291 | DST=8 |
272 | DST=12 |
| 292 | CNT=12 |
273 | CNT=16 |
| 293 | X=16 |
274 | X=20 |
| 294 | memsetb: |
275 | memsetb: |
| 295 | push %ebp |
276 | push %eax |
| 296 | movl %esp,%ebp |
- | |
| 297 | pusha |
277 | push %edi |
| 298 | 278 | ||
| 299 | cld |
- | |
| 300 | movl CNT(%ebp),%ecx |
279 | movl CNT(%esp),%ecx |
| 301 | movl DST(%ebp),%edi |
280 | movl DST(%esp),%edi |
| 302 | movl X(%ebp),%eax |
281 | movl X(%esp),%eax |
| 303 | 282 | ||
| 304 | rep stosb %al,%es:(%edi) |
283 | rep stosb %al,%es:(%edi) |
| 305 | 284 | ||
| 306 | popa |
285 | pop %edi |
| 307 | pop %ebp |
286 | pop %eax |
| 308 | ret |
287 | ret |
| 309 | 288 | ||
| 310 | 289 | ||
| 311 | ## Fill memory with words |
290 | ## Fill memory with words |
| 312 | # |
291 | # |
| 313 | # Fill a given number of words (2nd argument) |
292 | # Fill a given number of words (2nd argument) |
| 314 | # at memory defined by 1st argument with the |
293 | # at memory defined by 1st argument with the |
| 315 | # word value defined by 3rd argument. |
294 | # word value defined by 3rd argument. |
| 316 | # |
295 | # |
| 317 | DST=8 |
296 | DST=12 |
| 318 | CNT=12 |
297 | CNT=16 |
| 319 | X=16 |
298 | X=20 |
| 320 | memsetw: |
299 | memsetw: |
| 321 | push %ebp |
300 | push %eax |
| 322 | movl %esp,%ebp |
- | |
| 323 | pusha |
301 | push %edi |
| 324 | 302 | ||
| 325 | cld |
- | |
| 326 | movl CNT(%ebp),%ecx |
303 | movl CNT(%esp),%ecx |
| 327 | movl DST(%ebp),%edi |
304 | movl DST(%esp),%edi |
| 328 | movl X(%ebp),%eax |
305 | movl X(%esp),%eax |
| 329 | 306 | ||
| 330 | rep stosw %ax,%es:(%edi) |
307 | rep stosw %ax,%es:(%edi) |
| 331 | 308 | ||
| 332 | popa |
309 | pop %edi |
| 333 | pop %ebp |
310 | pop %eax |
| - | 311 | ||
| 334 | ret |
312 | ret |
| 335 | 313 | ||
| 336 | 314 | ||
| 337 | ## Compare memory regions for equality |
315 | ## Compare memory regions for equality |
| 338 | # |
316 | # |
| Line 343... | Line 321... | ||
| 343 | # |
321 | # |
| 344 | SRC=12 |
322 | SRC=12 |
| 345 | DST=16 |
323 | DST=16 |
| 346 | CNT=20 |
324 | CNT=20 |
| 347 | memcmp: |
325 | memcmp: |
| 348 | push %ebp |
326 | push %esi |
| 349 | subl $4,%esp |
- | |
| 350 | movl %esp,%ebp |
- | |
| 351 | - | ||
| 352 | pusha |
327 | push %edi |
| 353 | 328 | ||
| 354 | cld |
- | |
| 355 | movl CNT(%ebp),%ecx |
329 | movl CNT(%esp),%ecx |
| 356 | movl DST(%ebp),%edi |
330 | movl DST(%esp),%edi |
| 357 | movl SRC(%ebp),%esi |
331 | movl SRC(%esp),%esi |
| 358 | 332 | ||
| 359 | repe cmpsb %es:(%edi),%ds:(%esi) |
333 | repe cmpsb %es:(%edi),%ds:(%esi) |
| 360 | movl %ecx,(%ebp) |
334 | movl %ecx,%eax # %ecx contains the return value (zero on success) |
| 361 | 335 | ||
| 362 | popa |
336 | pop %edi |
| 363 | - | ||
| 364 | movl (%ebp),%eax # return value => %eax (zero on success) |
- | |
| 365 | addl $4,%esp |
- | |
| 366 | pop %ebp |
337 | pop %esi |
| 367 | 338 | ||
| 368 | ret |
339 | ret |
| 369 | 340 | ||
| 370 | 341 | ||
| 371 | # THIS IS USERSPACE CODE |
342 | # THIS IS USERSPACE CODE |
| 372 | .global utext |
343 | .global utext |
| 373 | utext: |
344 | utext: |
| 374 | xor %ax,%ax; |
345 | xor %ax,%ax |
| 375 | mov %ax,%ds; |
346 | mov %ax,%ds |
| 376 | mov %ax,%es; |
347 | mov %ax,%es |
| 377 | mov %ax,%fs; |
348 | mov %ax,%fs |
| 378 | mov %ax,%gs; |
349 | mov %ax,%gs |
| 379 | 0: |
350 | 0: |
| 380 | int $48 |
351 | int $48 |
| 381 | jmp 0b |
352 | jmp 0b |
| 382 | # not reached |
353 | # not reached |
| 383 | utext_end: |
354 | utext_end: |