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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: |