Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Local APIC handling, local APIC timers | |
3 | * | |
4 | * (c) 1999, 2000 Ingo Molnar <mingo@redhat.com> | |
5 | * | |
6 | * Fixes | |
7 | * Maciej W. Rozycki : Bits for genuine 82489DX APICs; | |
8 | * thanks to Eric Gilmore | |
9 | * and Rolf G. Tews | |
10 | * for testing these extensively. | |
11 | * Maciej W. Rozycki : Various updates and fixes. | |
12 | * Mikael Pettersson : Power Management for UP-APIC. | |
13 | * Pavel Machek and | |
14 | * Mikael Pettersson : PM converted to driver model. | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/init.h> |
18 | ||
19 | #include <linux/mm.h> | |
1da177e4 LT |
20 | #include <linux/delay.h> |
21 | #include <linux/bootmem.h> | |
22 | #include <linux/smp_lock.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/mc146818rtc.h> | |
25 | #include <linux/kernel_stat.h> | |
26 | #include <linux/sysdev.h> | |
d25bf7e5 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | |
29 | #include <asm/atomic.h> | |
30 | #include <asm/smp.h> | |
31 | #include <asm/mtrr.h> | |
32 | #include <asm/mpspec.h> | |
33 | #include <asm/pgalloc.h> | |
34 | #include <asm/mach_apic.h> | |
75152114 | 35 | #include <asm/nmi.h> |
95833c83 | 36 | #include <asm/idle.h> |
73dea47f AK |
37 | #include <asm/proto.h> |
38 | #include <asm/timex.h> | |
1da177e4 LT |
39 | |
40 | int apic_verbosity; | |
73dea47f | 41 | int apic_runs_main_timer; |
0c3749c4 | 42 | int apic_calibrate_pmtmr __initdata; |
1da177e4 LT |
43 | |
44 | int disable_apic_timer __initdata; | |
45 | ||
d25bf7e5 VP |
46 | /* |
47 | * cpu_mask that denotes the CPUs that needs timer interrupt coming in as | |
48 | * IPIs in place of local APIC timers | |
49 | */ | |
50 | static cpumask_t timer_interrupt_broadcast_ipi_mask; | |
51 | ||
1da177e4 | 52 | /* Using APIC to generate smp_local_timer_interrupt? */ |
acae9d32 | 53 | int using_apic_timer __read_mostly = 0; |
1da177e4 | 54 | |
1da177e4 LT |
55 | static void apic_pm_activate(void); |
56 | ||
57 | void enable_NMI_through_LVT0 (void * dummy) | |
58 | { | |
11a8e778 | 59 | unsigned int v; |
1da177e4 | 60 | |
1da177e4 | 61 | v = APIC_DM_NMI; /* unmask and set to NMI */ |
11a8e778 | 62 | apic_write(APIC_LVT0, v); |
1da177e4 LT |
63 | } |
64 | ||
65 | int get_maxlvt(void) | |
66 | { | |
11a8e778 | 67 | unsigned int v, maxlvt; |
1da177e4 LT |
68 | |
69 | v = apic_read(APIC_LVR); | |
1da177e4 LT |
70 | maxlvt = GET_APIC_MAXLVT(v); |
71 | return maxlvt; | |
72 | } | |
73 | ||
3777a959 AK |
74 | /* |
75 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
76 | * each architecture has to answer this themselves. | |
77 | */ | |
78 | void ack_bad_irq(unsigned int irq) | |
79 | { | |
80 | printk("unexpected IRQ trap at vector %02x\n", irq); | |
81 | /* | |
82 | * Currently unexpected vectors happen only on SMP and APIC. | |
83 | * We _must_ ack these because every local APIC has only N | |
84 | * irq slots per priority level, and a 'hanging, unacked' IRQ | |
85 | * holds up an irq slot - in excessive cases (when multiple | |
86 | * unexpected vectors occur) that might lock up the APIC | |
87 | * completely. | |
88 | * But don't ack when the APIC is disabled. -AK | |
89 | */ | |
90 | if (!disable_apic) | |
91 | ack_APIC_irq(); | |
92 | } | |
93 | ||
1da177e4 LT |
94 | void clear_local_APIC(void) |
95 | { | |
96 | int maxlvt; | |
97 | unsigned int v; | |
98 | ||
99 | maxlvt = get_maxlvt(); | |
100 | ||
101 | /* | |
704fc59e | 102 | * Masking an LVT entry can trigger a local APIC error |
1da177e4 LT |
103 | * if the vector is zero. Mask LVTERR first to prevent this. |
104 | */ | |
105 | if (maxlvt >= 3) { | |
106 | v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ | |
11a8e778 | 107 | apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); |
1da177e4 LT |
108 | } |
109 | /* | |
110 | * Careful: we have to set masks only first to deassert | |
111 | * any level-triggered sources. | |
112 | */ | |
113 | v = apic_read(APIC_LVTT); | |
11a8e778 | 114 | apic_write(APIC_LVTT, v | APIC_LVT_MASKED); |
1da177e4 | 115 | v = apic_read(APIC_LVT0); |
11a8e778 | 116 | apic_write(APIC_LVT0, v | APIC_LVT_MASKED); |
1da177e4 | 117 | v = apic_read(APIC_LVT1); |
11a8e778 | 118 | apic_write(APIC_LVT1, v | APIC_LVT_MASKED); |
1da177e4 LT |
119 | if (maxlvt >= 4) { |
120 | v = apic_read(APIC_LVTPC); | |
11a8e778 | 121 | apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); |
1da177e4 LT |
122 | } |
123 | ||
124 | /* | |
125 | * Clean APIC state for other OSs: | |
126 | */ | |
11a8e778 AK |
127 | apic_write(APIC_LVTT, APIC_LVT_MASKED); |
128 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
129 | apic_write(APIC_LVT1, APIC_LVT_MASKED); | |
1da177e4 | 130 | if (maxlvt >= 3) |
11a8e778 | 131 | apic_write(APIC_LVTERR, APIC_LVT_MASKED); |
1da177e4 | 132 | if (maxlvt >= 4) |
11a8e778 | 133 | apic_write(APIC_LVTPC, APIC_LVT_MASKED); |
1da177e4 | 134 | v = GET_APIC_VERSION(apic_read(APIC_LVR)); |
5a40b7c2 AK |
135 | apic_write(APIC_ESR, 0); |
136 | apic_read(APIC_ESR); | |
1da177e4 LT |
137 | } |
138 | ||
139 | void __init connect_bsp_APIC(void) | |
140 | { | |
141 | if (pic_mode) { | |
142 | /* | |
143 | * Do not trust the local APIC being empty at bootup. | |
144 | */ | |
145 | clear_local_APIC(); | |
146 | /* | |
147 | * PIC mode, enable APIC mode in the IMCR, i.e. | |
148 | * connect BSP's local APIC to INT and NMI lines. | |
149 | */ | |
150 | apic_printk(APIC_VERBOSE, "leaving PIC mode, enabling APIC mode.\n"); | |
151 | outb(0x70, 0x22); | |
152 | outb(0x01, 0x23); | |
153 | } | |
154 | } | |
155 | ||
208fb931 | 156 | void disconnect_bsp_APIC(int virt_wire_setup) |
1da177e4 LT |
157 | { |
158 | if (pic_mode) { | |
159 | /* | |
160 | * Put the board back into PIC mode (has an effect | |
161 | * only on certain older boards). Note that APIC | |
162 | * interrupts, including IPIs, won't work beyond | |
163 | * this point! The only exception are INIT IPIs. | |
164 | */ | |
165 | apic_printk(APIC_QUIET, "disabling APIC mode, entering PIC mode.\n"); | |
166 | outb(0x70, 0x22); | |
167 | outb(0x00, 0x23); | |
168 | } | |
208fb931 EB |
169 | else { |
170 | /* Go back to Virtual Wire compatibility mode */ | |
171 | unsigned long value; | |
172 | ||
173 | /* For the spurious interrupt use vector F, and enable it */ | |
174 | value = apic_read(APIC_SPIV); | |
175 | value &= ~APIC_VECTOR_MASK; | |
176 | value |= APIC_SPIV_APIC_ENABLED; | |
177 | value |= 0xf; | |
11a8e778 | 178 | apic_write(APIC_SPIV, value); |
208fb931 EB |
179 | |
180 | if (!virt_wire_setup) { | |
181 | /* For LVT0 make it edge triggered, active high, external and enabled */ | |
182 | value = apic_read(APIC_LVT0); | |
183 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
184 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
185 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED ); | |
186 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
187 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); | |
11a8e778 | 188 | apic_write(APIC_LVT0, value); |
208fb931 EB |
189 | } |
190 | else { | |
191 | /* Disable LVT0 */ | |
11a8e778 | 192 | apic_write(APIC_LVT0, APIC_LVT_MASKED); |
208fb931 EB |
193 | } |
194 | ||
195 | /* For LVT1 make it edge triggered, active high, nmi and enabled */ | |
196 | value = apic_read(APIC_LVT1); | |
197 | value &= ~( | |
198 | APIC_MODE_MASK | APIC_SEND_PENDING | | |
199 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
200 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
201 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
202 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); | |
11a8e778 | 203 | apic_write(APIC_LVT1, value); |
208fb931 | 204 | } |
1da177e4 LT |
205 | } |
206 | ||
207 | void disable_local_APIC(void) | |
208 | { | |
209 | unsigned int value; | |
210 | ||
211 | clear_local_APIC(); | |
212 | ||
213 | /* | |
214 | * Disable APIC (implies clearing of registers | |
215 | * for 82489DX!). | |
216 | */ | |
217 | value = apic_read(APIC_SPIV); | |
218 | value &= ~APIC_SPIV_APIC_ENABLED; | |
11a8e778 | 219 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
220 | } |
221 | ||
222 | /* | |
223 | * This is to verify that we're looking at a real local APIC. | |
224 | * Check these against your board if the CPUs aren't getting | |
225 | * started for no apparent reason. | |
226 | */ | |
227 | int __init verify_local_APIC(void) | |
228 | { | |
229 | unsigned int reg0, reg1; | |
230 | ||
231 | /* | |
232 | * The version register is read-only in a real APIC. | |
233 | */ | |
234 | reg0 = apic_read(APIC_LVR); | |
235 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); | |
236 | apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); | |
237 | reg1 = apic_read(APIC_LVR); | |
238 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); | |
239 | ||
240 | /* | |
241 | * The two version reads above should print the same | |
242 | * numbers. If the second one is different, then we | |
243 | * poke at a non-APIC. | |
244 | */ | |
245 | if (reg1 != reg0) | |
246 | return 0; | |
247 | ||
248 | /* | |
249 | * Check if the version looks reasonably. | |
250 | */ | |
251 | reg1 = GET_APIC_VERSION(reg0); | |
252 | if (reg1 == 0x00 || reg1 == 0xff) | |
253 | return 0; | |
254 | reg1 = get_maxlvt(); | |
255 | if (reg1 < 0x02 || reg1 == 0xff) | |
256 | return 0; | |
257 | ||
258 | /* | |
259 | * The ID register is read/write in a real APIC. | |
260 | */ | |
261 | reg0 = apic_read(APIC_ID); | |
262 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); | |
263 | apic_write(APIC_ID, reg0 ^ APIC_ID_MASK); | |
264 | reg1 = apic_read(APIC_ID); | |
265 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); | |
266 | apic_write(APIC_ID, reg0); | |
267 | if (reg1 != (reg0 ^ APIC_ID_MASK)) | |
268 | return 0; | |
269 | ||
270 | /* | |
271 | * The next two are just to see if we have sane values. | |
272 | * They're only really relevant if we're in Virtual Wire | |
273 | * compatibility mode, but most boxes are anymore. | |
274 | */ | |
275 | reg0 = apic_read(APIC_LVT0); | |
276 | apic_printk(APIC_DEBUG,"Getting LVT0: %x\n", reg0); | |
277 | reg1 = apic_read(APIC_LVT1); | |
278 | apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); | |
279 | ||
280 | return 1; | |
281 | } | |
282 | ||
283 | void __init sync_Arb_IDs(void) | |
284 | { | |
285 | /* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 */ | |
286 | unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR)); | |
287 | if (ver >= 0x14) /* P4 or higher */ | |
288 | return; | |
289 | ||
290 | /* | |
291 | * Wait for idle. | |
292 | */ | |
293 | apic_wait_icr_idle(); | |
294 | ||
295 | apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); | |
11a8e778 | 296 | apic_write(APIC_ICR, APIC_DEST_ALLINC | APIC_INT_LEVELTRIG |
1da177e4 LT |
297 | | APIC_DM_INIT); |
298 | } | |
299 | ||
300 | extern void __error_in_apic_c (void); | |
301 | ||
302 | /* | |
303 | * An initial setup of the virtual wire mode. | |
304 | */ | |
305 | void __init init_bsp_APIC(void) | |
306 | { | |
11a8e778 | 307 | unsigned int value; |
1da177e4 LT |
308 | |
309 | /* | |
310 | * Don't do the setup now if we have a SMP BIOS as the | |
311 | * through-I/O-APIC virtual wire mode might be active. | |
312 | */ | |
313 | if (smp_found_config || !cpu_has_apic) | |
314 | return; | |
315 | ||
316 | value = apic_read(APIC_LVR); | |
1da177e4 LT |
317 | |
318 | /* | |
319 | * Do not trust the local APIC being empty at bootup. | |
320 | */ | |
321 | clear_local_APIC(); | |
322 | ||
323 | /* | |
324 | * Enable APIC. | |
325 | */ | |
326 | value = apic_read(APIC_SPIV); | |
327 | value &= ~APIC_VECTOR_MASK; | |
328 | value |= APIC_SPIV_APIC_ENABLED; | |
329 | value |= APIC_SPIV_FOCUS_DISABLED; | |
330 | value |= SPURIOUS_APIC_VECTOR; | |
11a8e778 | 331 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
332 | |
333 | /* | |
334 | * Set up the virtual wire mode. | |
335 | */ | |
11a8e778 | 336 | apic_write(APIC_LVT0, APIC_DM_EXTINT); |
1da177e4 | 337 | value = APIC_DM_NMI; |
11a8e778 | 338 | apic_write(APIC_LVT1, value); |
1da177e4 LT |
339 | } |
340 | ||
e6982c67 | 341 | void __cpuinit setup_local_APIC (void) |
1da177e4 | 342 | { |
11a8e778 | 343 | unsigned int value, maxlvt; |
da7ed9f9 | 344 | int i, j; |
1da177e4 | 345 | |
1da177e4 | 346 | value = apic_read(APIC_LVR); |
1da177e4 LT |
347 | |
348 | if ((SPURIOUS_APIC_VECTOR & 0x0f) != 0x0f) | |
349 | __error_in_apic_c(); | |
350 | ||
351 | /* | |
352 | * Double-check whether this APIC is really registered. | |
353 | * This is meaningless in clustered apic mode, so we skip it. | |
354 | */ | |
355 | if (!apic_id_registered()) | |
356 | BUG(); | |
357 | ||
358 | /* | |
359 | * Intel recommends to set DFR, LDR and TPR before enabling | |
360 | * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel | |
361 | * document number 292116). So here it goes... | |
362 | */ | |
363 | init_apic_ldr(); | |
364 | ||
365 | /* | |
366 | * Set Task Priority to 'accept all'. We never change this | |
367 | * later on. | |
368 | */ | |
369 | value = apic_read(APIC_TASKPRI); | |
370 | value &= ~APIC_TPRI_MASK; | |
11a8e778 | 371 | apic_write(APIC_TASKPRI, value); |
1da177e4 | 372 | |
da7ed9f9 VG |
373 | /* |
374 | * After a crash, we no longer service the interrupts and a pending | |
375 | * interrupt from previous kernel might still have ISR bit set. | |
376 | * | |
377 | * Most probably by now CPU has serviced that pending interrupt and | |
378 | * it might not have done the ack_APIC_irq() because it thought, | |
379 | * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it | |
380 | * does not clear the ISR bit and cpu thinks it has already serivced | |
381 | * the interrupt. Hence a vector might get locked. It was noticed | |
382 | * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. | |
383 | */ | |
384 | for (i = APIC_ISR_NR - 1; i >= 0; i--) { | |
385 | value = apic_read(APIC_ISR + i*0x10); | |
386 | for (j = 31; j >= 0; j--) { | |
387 | if (value & (1<<j)) | |
388 | ack_APIC_irq(); | |
389 | } | |
390 | } | |
391 | ||
1da177e4 LT |
392 | /* |
393 | * Now that we are all set up, enable the APIC | |
394 | */ | |
395 | value = apic_read(APIC_SPIV); | |
396 | value &= ~APIC_VECTOR_MASK; | |
397 | /* | |
398 | * Enable APIC | |
399 | */ | |
400 | value |= APIC_SPIV_APIC_ENABLED; | |
401 | ||
402 | /* | |
d5d9ca6d | 403 | * Some unknown Intel IO/APIC (or APIC) errata are biting us with |
1da177e4 LT |
404 | * certain networking cards. If high frequency interrupts are |
405 | * happening on a particular IOAPIC pin, plus the IOAPIC routing | |
406 | * entry is masked/unmasked at a high rate as well then sooner or | |
407 | * later IOAPIC line gets 'stuck', no more interrupts are received | |
408 | * from the device. If focus CPU is disabled then the hang goes | |
409 | * away, oh well :-( | |
410 | * | |
411 | * [ This bug can be reproduced easily with a level-triggered | |
412 | * PCI Ne2000 networking cards and PII/PIII processors, dual | |
413 | * BX chipset. ] | |
414 | */ | |
415 | /* | |
416 | * Actually disabling the focus CPU check just makes the hang less | |
417 | * frequent as it makes the interrupt distributon model be more | |
418 | * like LRU than MRU (the short-term load is more even across CPUs). | |
419 | * See also the comment in end_level_ioapic_irq(). --macro | |
420 | */ | |
421 | #if 1 | |
422 | /* Enable focus processor (bit==0) */ | |
423 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
424 | #else | |
425 | /* Disable focus processor (bit==1) */ | |
426 | value |= APIC_SPIV_FOCUS_DISABLED; | |
427 | #endif | |
428 | /* | |
429 | * Set spurious IRQ vector | |
430 | */ | |
431 | value |= SPURIOUS_APIC_VECTOR; | |
11a8e778 | 432 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
433 | |
434 | /* | |
435 | * Set up LVT0, LVT1: | |
436 | * | |
437 | * set up through-local-APIC on the BP's LINT0. This is not | |
438 | * strictly necessary in pure symmetric-IO mode, but sometimes | |
439 | * we delegate interrupts to the 8259A. | |
440 | */ | |
441 | /* | |
442 | * TODO: set up through-local-APIC from through-I/O-APIC? --macro | |
443 | */ | |
444 | value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; | |
445 | if (!smp_processor_id() && (pic_mode || !value)) { | |
446 | value = APIC_DM_EXTINT; | |
447 | apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", smp_processor_id()); | |
448 | } else { | |
449 | value = APIC_DM_EXTINT | APIC_LVT_MASKED; | |
450 | apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", smp_processor_id()); | |
451 | } | |
11a8e778 | 452 | apic_write(APIC_LVT0, value); |
1da177e4 LT |
453 | |
454 | /* | |
455 | * only the BP should see the LINT1 NMI signal, obviously. | |
456 | */ | |
457 | if (!smp_processor_id()) | |
458 | value = APIC_DM_NMI; | |
459 | else | |
460 | value = APIC_DM_NMI | APIC_LVT_MASKED; | |
11a8e778 | 461 | apic_write(APIC_LVT1, value); |
1da177e4 | 462 | |
61c11341 | 463 | { |
1da177e4 LT |
464 | unsigned oldvalue; |
465 | maxlvt = get_maxlvt(); | |
1da177e4 LT |
466 | oldvalue = apic_read(APIC_ESR); |
467 | value = ERROR_APIC_VECTOR; // enables sending errors | |
11a8e778 | 468 | apic_write(APIC_LVTERR, value); |
1da177e4 LT |
469 | /* |
470 | * spec says clear errors after enabling vector. | |
471 | */ | |
472 | if (maxlvt > 3) | |
473 | apic_write(APIC_ESR, 0); | |
474 | value = apic_read(APIC_ESR); | |
475 | if (value != oldvalue) | |
476 | apic_printk(APIC_VERBOSE, | |
477 | "ESR value after enabling vector: %08x, after %08x\n", | |
478 | oldvalue, value); | |
1da177e4 LT |
479 | } |
480 | ||
481 | nmi_watchdog_default(); | |
f2802e7f | 482 | setup_apic_nmi_watchdog(NULL); |
1da177e4 LT |
483 | apic_pm_activate(); |
484 | } | |
485 | ||
486 | #ifdef CONFIG_PM | |
487 | ||
488 | static struct { | |
489 | /* 'active' is true if the local APIC was enabled by us and | |
490 | not the BIOS; this signifies that we are also responsible | |
491 | for disabling it before entering apm/acpi suspend */ | |
492 | int active; | |
493 | /* r/w apic fields */ | |
494 | unsigned int apic_id; | |
495 | unsigned int apic_taskpri; | |
496 | unsigned int apic_ldr; | |
497 | unsigned int apic_dfr; | |
498 | unsigned int apic_spiv; | |
499 | unsigned int apic_lvtt; | |
500 | unsigned int apic_lvtpc; | |
501 | unsigned int apic_lvt0; | |
502 | unsigned int apic_lvt1; | |
503 | unsigned int apic_lvterr; | |
504 | unsigned int apic_tmict; | |
505 | unsigned int apic_tdcr; | |
506 | unsigned int apic_thmr; | |
507 | } apic_pm_state; | |
508 | ||
0b9c33a7 | 509 | static int lapic_suspend(struct sys_device *dev, pm_message_t state) |
1da177e4 LT |
510 | { |
511 | unsigned long flags; | |
512 | ||
513 | if (!apic_pm_state.active) | |
514 | return 0; | |
515 | ||
516 | apic_pm_state.apic_id = apic_read(APIC_ID); | |
517 | apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); | |
518 | apic_pm_state.apic_ldr = apic_read(APIC_LDR); | |
519 | apic_pm_state.apic_dfr = apic_read(APIC_DFR); | |
520 | apic_pm_state.apic_spiv = apic_read(APIC_SPIV); | |
521 | apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); | |
522 | apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); | |
523 | apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); | |
524 | apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); | |
525 | apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); | |
526 | apic_pm_state.apic_tmict = apic_read(APIC_TMICT); | |
527 | apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); | |
528 | apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); | |
529 | local_save_flags(flags); | |
530 | local_irq_disable(); | |
531 | disable_local_APIC(); | |
532 | local_irq_restore(flags); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static int lapic_resume(struct sys_device *dev) | |
537 | { | |
538 | unsigned int l, h; | |
539 | unsigned long flags; | |
540 | ||
541 | if (!apic_pm_state.active) | |
542 | return 0; | |
543 | ||
1da177e4 LT |
544 | local_irq_save(flags); |
545 | rdmsr(MSR_IA32_APICBASE, l, h); | |
546 | l &= ~MSR_IA32_APICBASE_BASE; | |
5b743573 | 547 | l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr; |
1da177e4 LT |
548 | wrmsr(MSR_IA32_APICBASE, l, h); |
549 | apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED); | |
550 | apic_write(APIC_ID, apic_pm_state.apic_id); | |
551 | apic_write(APIC_DFR, apic_pm_state.apic_dfr); | |
552 | apic_write(APIC_LDR, apic_pm_state.apic_ldr); | |
553 | apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); | |
554 | apic_write(APIC_SPIV, apic_pm_state.apic_spiv); | |
555 | apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); | |
556 | apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); | |
557 | apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); | |
558 | apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); | |
559 | apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); | |
560 | apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); | |
561 | apic_write(APIC_TMICT, apic_pm_state.apic_tmict); | |
562 | apic_write(APIC_ESR, 0); | |
563 | apic_read(APIC_ESR); | |
564 | apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); | |
565 | apic_write(APIC_ESR, 0); | |
566 | apic_read(APIC_ESR); | |
567 | local_irq_restore(flags); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | static struct sysdev_class lapic_sysclass = { | |
572 | set_kset_name("lapic"), | |
573 | .resume = lapic_resume, | |
574 | .suspend = lapic_suspend, | |
575 | }; | |
576 | ||
577 | static struct sys_device device_lapic = { | |
578 | .id = 0, | |
579 | .cls = &lapic_sysclass, | |
580 | }; | |
581 | ||
e6982c67 | 582 | static void __cpuinit apic_pm_activate(void) |
1da177e4 LT |
583 | { |
584 | apic_pm_state.active = 1; | |
585 | } | |
586 | ||
587 | static int __init init_lapic_sysfs(void) | |
588 | { | |
589 | int error; | |
590 | if (!cpu_has_apic) | |
591 | return 0; | |
592 | /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ | |
593 | error = sysdev_class_register(&lapic_sysclass); | |
594 | if (!error) | |
595 | error = sysdev_register(&device_lapic); | |
596 | return error; | |
597 | } | |
598 | device_initcall(init_lapic_sysfs); | |
599 | ||
600 | #else /* CONFIG_PM */ | |
601 | ||
602 | static void apic_pm_activate(void) { } | |
603 | ||
604 | #endif /* CONFIG_PM */ | |
605 | ||
606 | static int __init apic_set_verbosity(char *str) | |
607 | { | |
608 | if (strcmp("debug", str) == 0) | |
609 | apic_verbosity = APIC_DEBUG; | |
610 | else if (strcmp("verbose", str) == 0) | |
611 | apic_verbosity = APIC_VERBOSE; | |
612 | else | |
613 | printk(KERN_WARNING "APIC Verbosity level %s not recognised" | |
614 | " use apic=verbose or apic=debug", str); | |
615 | ||
9b41046c | 616 | return 1; |
1da177e4 LT |
617 | } |
618 | ||
619 | __setup("apic=", apic_set_verbosity); | |
620 | ||
621 | /* | |
622 | * Detect and enable local APICs on non-SMP boards. | |
623 | * Original code written by Keir Fraser. | |
624 | * On AMD64 we trust the BIOS - if it says no APIC it is likely | |
625 | * not correctly set up (usually the APIC timer won't work etc.) | |
626 | */ | |
627 | ||
628 | static int __init detect_init_APIC (void) | |
629 | { | |
630 | if (!cpu_has_apic) { | |
631 | printk(KERN_INFO "No local APIC present\n"); | |
632 | return -1; | |
633 | } | |
634 | ||
635 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
636 | boot_cpu_id = 0; | |
637 | return 0; | |
638 | } | |
639 | ||
640 | void __init init_apic_mappings(void) | |
641 | { | |
642 | unsigned long apic_phys; | |
643 | ||
644 | /* | |
645 | * If no local APIC can be found then set up a fake all | |
646 | * zeroes page to simulate the local APIC and another | |
647 | * one for the IO-APIC. | |
648 | */ | |
649 | if (!smp_found_config && detect_init_APIC()) { | |
650 | apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); | |
651 | apic_phys = __pa(apic_phys); | |
652 | } else | |
653 | apic_phys = mp_lapic_addr; | |
654 | ||
655 | set_fixmap_nocache(FIX_APIC_BASE, apic_phys); | |
656 | apic_printk(APIC_VERBOSE,"mapped APIC to %16lx (%16lx)\n", APIC_BASE, apic_phys); | |
657 | ||
658 | /* | |
659 | * Fetch the APIC ID of the BSP in case we have a | |
660 | * default configuration (or the MP table is broken). | |
661 | */ | |
1d3fbbf9 | 662 | boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID)); |
1da177e4 | 663 | |
1da177e4 LT |
664 | { |
665 | unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0; | |
666 | int i; | |
667 | ||
668 | for (i = 0; i < nr_ioapics; i++) { | |
669 | if (smp_found_config) { | |
670 | ioapic_phys = mp_ioapics[i].mpc_apicaddr; | |
671 | } else { | |
672 | ioapic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); | |
673 | ioapic_phys = __pa(ioapic_phys); | |
674 | } | |
675 | set_fixmap_nocache(idx, ioapic_phys); | |
676 | apic_printk(APIC_VERBOSE,"mapped IOAPIC to %016lx (%016lx)\n", | |
677 | __fix_to_virt(idx), ioapic_phys); | |
678 | idx++; | |
679 | } | |
680 | } | |
1da177e4 LT |
681 | } |
682 | ||
683 | /* | |
684 | * This function sets up the local APIC timer, with a timeout of | |
685 | * 'clocks' APIC bus clock. During calibration we actually call | |
686 | * this function twice on the boot CPU, once with a bogus timeout | |
687 | * value, second time for real. The other (noncalibrating) CPUs | |
688 | * call this function only once, with the real, calibrated value. | |
689 | * | |
690 | * We do reads before writes even if unnecessary, to get around the | |
691 | * P5 APIC double write bug. | |
692 | */ | |
693 | ||
694 | #define APIC_DIVISOR 16 | |
695 | ||
696 | static void __setup_APIC_LVTT(unsigned int clocks) | |
697 | { | |
698 | unsigned int lvtt_value, tmp_value, ver; | |
d25bf7e5 | 699 | int cpu = smp_processor_id(); |
1da177e4 LT |
700 | |
701 | ver = GET_APIC_VERSION(apic_read(APIC_LVR)); | |
702 | lvtt_value = APIC_LVT_TIMER_PERIODIC | LOCAL_TIMER_VECTOR; | |
d25bf7e5 VP |
703 | |
704 | if (cpu_isset(cpu, timer_interrupt_broadcast_ipi_mask)) | |
705 | lvtt_value |= APIC_LVT_MASKED; | |
706 | ||
11a8e778 | 707 | apic_write(APIC_LVTT, lvtt_value); |
1da177e4 LT |
708 | |
709 | /* | |
710 | * Divide PICLK by 16 | |
711 | */ | |
712 | tmp_value = apic_read(APIC_TDCR); | |
11a8e778 | 713 | apic_write(APIC_TDCR, (tmp_value |
1da177e4 LT |
714 | & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) |
715 | | APIC_TDR_DIV_16); | |
716 | ||
11a8e778 | 717 | apic_write(APIC_TMICT, clocks/APIC_DIVISOR); |
1da177e4 LT |
718 | } |
719 | ||
720 | static void setup_APIC_timer(unsigned int clocks) | |
721 | { | |
722 | unsigned long flags; | |
723 | ||
724 | local_irq_save(flags); | |
725 | ||
1da177e4 | 726 | /* wait for irq slice */ |
33042a9f | 727 | if (vxtime.hpet_address && hpet_use_timer) { |
1da177e4 LT |
728 | int trigger = hpet_readl(HPET_T0_CMP); |
729 | while (hpet_readl(HPET_COUNTER) >= trigger) | |
730 | /* do nothing */ ; | |
731 | while (hpet_readl(HPET_COUNTER) < trigger) | |
732 | /* do nothing */ ; | |
733 | } else { | |
734 | int c1, c2; | |
735 | outb_p(0x00, 0x43); | |
736 | c2 = inb_p(0x40); | |
737 | c2 |= inb_p(0x40) << 8; | |
11a8e778 | 738 | do { |
1da177e4 LT |
739 | c1 = c2; |
740 | outb_p(0x00, 0x43); | |
741 | c2 = inb_p(0x40); | |
742 | c2 |= inb_p(0x40) << 8; | |
743 | } while (c2 - c1 < 300); | |
744 | } | |
1da177e4 | 745 | __setup_APIC_LVTT(clocks); |
73dea47f AK |
746 | /* Turn off PIT interrupt if we use APIC timer as main timer. |
747 | Only works with the PM timer right now | |
748 | TBD fix it for HPET too. */ | |
749 | if (vxtime.mode == VXTIME_PMTMR && | |
750 | smp_processor_id() == boot_cpu_id && | |
751 | apic_runs_main_timer == 1 && | |
752 | !cpu_isset(boot_cpu_id, timer_interrupt_broadcast_ipi_mask)) { | |
753 | stop_timer_interrupt(); | |
754 | apic_runs_main_timer++; | |
755 | } | |
1da177e4 LT |
756 | local_irq_restore(flags); |
757 | } | |
758 | ||
759 | /* | |
760 | * In this function we calibrate APIC bus clocks to the external | |
761 | * timer. Unfortunately we cannot use jiffies and the timer irq | |
762 | * to calibrate, since some later bootup code depends on getting | |
763 | * the first irq? Ugh. | |
764 | * | |
765 | * We want to do the calibration only once since we | |
766 | * want to have local timer irqs syncron. CPUs connected | |
767 | * by the same APIC bus have the very same bus frequency. | |
768 | * And we want to have irqs off anyways, no accidental | |
769 | * APIC irq that way. | |
770 | */ | |
771 | ||
772 | #define TICK_COUNT 100000000 | |
773 | ||
774 | static int __init calibrate_APIC_clock(void) | |
775 | { | |
776 | int apic, apic_start, tsc, tsc_start; | |
777 | int result; | |
778 | /* | |
779 | * Put whatever arbitrary (but long enough) timeout | |
780 | * value into the APIC clock, we just want to get the | |
781 | * counter running for calibration. | |
782 | */ | |
783 | __setup_APIC_LVTT(1000000000); | |
784 | ||
785 | apic_start = apic_read(APIC_TMCCT); | |
0c3749c4 AK |
786 | #ifdef CONFIG_X86_PM_TIMER |
787 | if (apic_calibrate_pmtmr && pmtmr_ioport) { | |
788 | pmtimer_wait(5000); /* 5ms wait */ | |
1da177e4 | 789 | apic = apic_read(APIC_TMCCT); |
0c3749c4 AK |
790 | result = (apic_start - apic) * 1000L / 5; |
791 | } else | |
792 | #endif | |
793 | { | |
794 | rdtscl(tsc_start); | |
795 | ||
796 | do { | |
797 | apic = apic_read(APIC_TMCCT); | |
798 | rdtscl(tsc); | |
799 | } while ((tsc - tsc_start) < TICK_COUNT && | |
800 | (apic - apic_start) < TICK_COUNT); | |
801 | ||
802 | result = (apic_start - apic) * 1000L * cpu_khz / | |
803 | (tsc - tsc_start); | |
804 | } | |
805 | printk("result %d\n", result); | |
1da177e4 | 806 | |
1da177e4 LT |
807 | |
808 | printk(KERN_INFO "Detected %d.%03d MHz APIC timer.\n", | |
809 | result / 1000 / 1000, result / 1000 % 1000); | |
810 | ||
811 | return result * APIC_DIVISOR / HZ; | |
812 | } | |
813 | ||
814 | static unsigned int calibration_result; | |
815 | ||
816 | void __init setup_boot_APIC_clock (void) | |
817 | { | |
818 | if (disable_apic_timer) { | |
819 | printk(KERN_INFO "Disabling APIC timer\n"); | |
820 | return; | |
821 | } | |
822 | ||
823 | printk(KERN_INFO "Using local APIC timer interrupts.\n"); | |
824 | using_apic_timer = 1; | |
825 | ||
826 | local_irq_disable(); | |
827 | ||
828 | calibration_result = calibrate_APIC_clock(); | |
829 | /* | |
830 | * Now set up the timer for real. | |
831 | */ | |
832 | setup_APIC_timer(calibration_result); | |
833 | ||
834 | local_irq_enable(); | |
835 | } | |
836 | ||
e6982c67 | 837 | void __cpuinit setup_secondary_APIC_clock(void) |
1da177e4 LT |
838 | { |
839 | local_irq_disable(); /* FIXME: Do we need this? --RR */ | |
840 | setup_APIC_timer(calibration_result); | |
841 | local_irq_enable(); | |
842 | } | |
843 | ||
d25bf7e5 | 844 | void disable_APIC_timer(void) |
1da177e4 LT |
845 | { |
846 | if (using_apic_timer) { | |
847 | unsigned long v; | |
848 | ||
849 | v = apic_read(APIC_LVTT); | |
704fc59e SS |
850 | /* |
851 | * When an illegal vector value (0-15) is written to an LVT | |
852 | * entry and delivery mode is Fixed, the APIC may signal an | |
853 | * illegal vector error, with out regard to whether the mask | |
854 | * bit is set or whether an interrupt is actually seen on input. | |
855 | * | |
856 | * Boot sequence might call this function when the LVTT has | |
857 | * '0' vector value. So make sure vector field is set to | |
858 | * valid value. | |
859 | */ | |
860 | v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
861 | apic_write(APIC_LVTT, v); | |
1da177e4 LT |
862 | } |
863 | } | |
864 | ||
865 | void enable_APIC_timer(void) | |
866 | { | |
d25bf7e5 VP |
867 | int cpu = smp_processor_id(); |
868 | ||
869 | if (using_apic_timer && | |
870 | !cpu_isset(cpu, timer_interrupt_broadcast_ipi_mask)) { | |
1da177e4 LT |
871 | unsigned long v; |
872 | ||
873 | v = apic_read(APIC_LVTT); | |
11a8e778 | 874 | apic_write(APIC_LVTT, v & ~APIC_LVT_MASKED); |
1da177e4 LT |
875 | } |
876 | } | |
877 | ||
d25bf7e5 VP |
878 | void switch_APIC_timer_to_ipi(void *cpumask) |
879 | { | |
880 | cpumask_t mask = *(cpumask_t *)cpumask; | |
881 | int cpu = smp_processor_id(); | |
882 | ||
883 | if (cpu_isset(cpu, mask) && | |
884 | !cpu_isset(cpu, timer_interrupt_broadcast_ipi_mask)) { | |
885 | disable_APIC_timer(); | |
886 | cpu_set(cpu, timer_interrupt_broadcast_ipi_mask); | |
887 | } | |
888 | } | |
889 | EXPORT_SYMBOL(switch_APIC_timer_to_ipi); | |
890 | ||
891 | void smp_send_timer_broadcast_ipi(void) | |
892 | { | |
893 | cpumask_t mask; | |
894 | ||
895 | cpus_and(mask, cpu_online_map, timer_interrupt_broadcast_ipi_mask); | |
896 | if (!cpus_empty(mask)) { | |
897 | send_IPI_mask(mask, LOCAL_TIMER_VECTOR); | |
898 | } | |
899 | } | |
900 | ||
901 | void switch_ipi_to_APIC_timer(void *cpumask) | |
902 | { | |
903 | cpumask_t mask = *(cpumask_t *)cpumask; | |
904 | int cpu = smp_processor_id(); | |
905 | ||
906 | if (cpu_isset(cpu, mask) && | |
907 | cpu_isset(cpu, timer_interrupt_broadcast_ipi_mask)) { | |
908 | cpu_clear(cpu, timer_interrupt_broadcast_ipi_mask); | |
909 | enable_APIC_timer(); | |
910 | } | |
911 | } | |
912 | EXPORT_SYMBOL(switch_ipi_to_APIC_timer); | |
913 | ||
1da177e4 LT |
914 | int setup_profiling_timer(unsigned int multiplier) |
915 | { | |
5a07a30c | 916 | return -EINVAL; |
1da177e4 LT |
917 | } |
918 | ||
17fc14ff JS |
919 | void setup_APIC_extened_lvt(unsigned char lvt_off, unsigned char vector, |
920 | unsigned char msg_type, unsigned char mask) | |
89b831ef | 921 | { |
17fc14ff JS |
922 | unsigned long reg = (lvt_off << 4) + K8_APIC_EXT_LVT_BASE; |
923 | unsigned int v = (mask << 16) | (msg_type << 8) | vector; | |
89b831ef JS |
924 | apic_write(reg, v); |
925 | } | |
89b831ef | 926 | |
1da177e4 LT |
927 | #undef APIC_DIVISOR |
928 | ||
929 | /* | |
930 | * Local timer interrupt handler. It does both profiling and | |
931 | * process statistics/rescheduling. | |
932 | * | |
933 | * We do profiling in every local tick, statistics/rescheduling | |
934 | * happen only every 'profiling multiplier' ticks. The default | |
935 | * multiplier is 1 and it can be changed by writing the new multiplier | |
936 | * value into /proc/profile. | |
937 | */ | |
938 | ||
939 | void smp_local_timer_interrupt(struct pt_regs *regs) | |
940 | { | |
1da177e4 | 941 | profile_tick(CPU_PROFILING, regs); |
1da177e4 | 942 | #ifdef CONFIG_SMP |
5a07a30c | 943 | update_process_times(user_mode(regs)); |
1da177e4 | 944 | #endif |
73dea47f AK |
945 | if (apic_runs_main_timer > 1 && smp_processor_id() == boot_cpu_id) |
946 | main_timer_handler(regs); | |
1da177e4 LT |
947 | /* |
948 | * We take the 'long' return path, and there every subsystem | |
949 | * grabs the appropriate locks (kernel lock/ irq lock). | |
950 | * | |
d5d9ca6d | 951 | * We might want to decouple profiling from the 'long path', |
1da177e4 LT |
952 | * and do the profiling totally in assembly. |
953 | * | |
954 | * Currently this isn't too much of an issue (performance wise), | |
955 | * we can take more than 100K local irqs per second on a 100 MHz P5. | |
956 | */ | |
957 | } | |
958 | ||
959 | /* | |
960 | * Local APIC timer interrupt. This is the most natural way for doing | |
961 | * local interrupts, but local timer interrupts can be emulated by | |
962 | * broadcast interrupts too. [in case the hw doesn't support APIC timers] | |
963 | * | |
964 | * [ if a single-CPU system runs an SMP kernel then we call the local | |
965 | * interrupt as well. Thus we cannot inline the local irq ... ] | |
966 | */ | |
967 | void smp_apic_timer_interrupt(struct pt_regs *regs) | |
968 | { | |
969 | /* | |
970 | * the NMI deadlock-detector uses this. | |
971 | */ | |
972 | add_pda(apic_timer_irqs, 1); | |
973 | ||
974 | /* | |
975 | * NOTE! We'd better ACK the irq immediately, | |
976 | * because timer handling can be slow. | |
977 | */ | |
978 | ack_APIC_irq(); | |
979 | /* | |
980 | * update_process_times() expects us to have done irq_enter(). | |
981 | * Besides, if we don't timer interrupts ignore the global | |
982 | * interrupt lock, which is the WrongThing (tm) to do. | |
983 | */ | |
95833c83 | 984 | exit_idle(); |
1da177e4 LT |
985 | irq_enter(); |
986 | smp_local_timer_interrupt(regs); | |
987 | irq_exit(); | |
988 | } | |
989 | ||
990 | /* | |
f8bf3c65 | 991 | * apic_is_clustered_box() -- Check if we can expect good TSC |
1da177e4 LT |
992 | * |
993 | * Thus far, the major user of this is IBM's Summit2 series: | |
994 | * | |
637029c6 | 995 | * Clustered boxes may have unsynced TSC problems if they are |
1da177e4 LT |
996 | * multi-chassis. Use available data to take a good guess. |
997 | * If in doubt, go HPET. | |
998 | */ | |
f8bf3c65 | 999 | __cpuinit int apic_is_clustered_box(void) |
1da177e4 LT |
1000 | { |
1001 | int i, clusters, zeros; | |
1002 | unsigned id; | |
1003 | DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); | |
1004 | ||
376ec33f | 1005 | bitmap_zero(clustermap, NUM_APIC_CLUSTERS); |
1da177e4 LT |
1006 | |
1007 | for (i = 0; i < NR_CPUS; i++) { | |
1008 | id = bios_cpu_apicid[i]; | |
1009 | if (id != BAD_APICID) | |
1010 | __set_bit(APIC_CLUSTERID(id), clustermap); | |
1011 | } | |
1012 | ||
1013 | /* Problem: Partially populated chassis may not have CPUs in some of | |
1014 | * the APIC clusters they have been allocated. Only present CPUs have | |
1015 | * bios_cpu_apicid entries, thus causing zeroes in the bitmap. Since | |
1016 | * clusters are allocated sequentially, count zeros only if they are | |
1017 | * bounded by ones. | |
1018 | */ | |
1019 | clusters = 0; | |
1020 | zeros = 0; | |
1021 | for (i = 0; i < NUM_APIC_CLUSTERS; i++) { | |
1022 | if (test_bit(i, clustermap)) { | |
1023 | clusters += 1 + zeros; | |
1024 | zeros = 0; | |
1025 | } else | |
1026 | ++zeros; | |
1027 | } | |
1028 | ||
1029 | /* | |
f8bf3c65 | 1030 | * If clusters > 2, then should be multi-chassis. |
1da177e4 LT |
1031 | * May have to revisit this when multi-core + hyperthreaded CPUs come |
1032 | * out, but AFAIK this will work even for them. | |
1033 | */ | |
1034 | return (clusters > 2); | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * This interrupt should _never_ happen with our APIC/SMP architecture | |
1039 | */ | |
1040 | asmlinkage void smp_spurious_interrupt(void) | |
1041 | { | |
1042 | unsigned int v; | |
95833c83 | 1043 | exit_idle(); |
1da177e4 LT |
1044 | irq_enter(); |
1045 | /* | |
1046 | * Check if this really is a spurious interrupt and ACK it | |
1047 | * if it is a vectored one. Just in case... | |
1048 | * Spurious interrupts should not be ACKed. | |
1049 | */ | |
1050 | v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); | |
1051 | if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) | |
1052 | ack_APIC_irq(); | |
1053 | ||
1054 | #if 0 | |
1055 | static unsigned long last_warning; | |
1056 | static unsigned long skipped; | |
1057 | ||
1058 | /* see sw-dev-man vol 3, chapter 7.4.13.5 */ | |
1059 | if (time_before(last_warning+30*HZ,jiffies)) { | |
1060 | printk(KERN_INFO "spurious APIC interrupt on CPU#%d, %ld skipped.\n", | |
1061 | smp_processor_id(), skipped); | |
1062 | last_warning = jiffies; | |
1063 | skipped = 0; | |
1064 | } else { | |
1065 | skipped++; | |
1066 | } | |
1067 | #endif | |
1068 | irq_exit(); | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * This interrupt should never happen with our APIC/SMP architecture | |
1073 | */ | |
1074 | ||
1075 | asmlinkage void smp_error_interrupt(void) | |
1076 | { | |
1077 | unsigned int v, v1; | |
1078 | ||
95833c83 | 1079 | exit_idle(); |
1da177e4 LT |
1080 | irq_enter(); |
1081 | /* First tickle the hardware, only then report what went on. -- REW */ | |
1082 | v = apic_read(APIC_ESR); | |
1083 | apic_write(APIC_ESR, 0); | |
1084 | v1 = apic_read(APIC_ESR); | |
1085 | ack_APIC_irq(); | |
1086 | atomic_inc(&irq_err_count); | |
1087 | ||
1088 | /* Here is what the APIC error bits mean: | |
1089 | 0: Send CS error | |
1090 | 1: Receive CS error | |
1091 | 2: Send accept error | |
1092 | 3: Receive accept error | |
1093 | 4: Reserved | |
1094 | 5: Send illegal vector | |
1095 | 6: Received illegal vector | |
1096 | 7: Illegal register address | |
1097 | */ | |
1098 | printk (KERN_DEBUG "APIC error on CPU%d: %02x(%02x)\n", | |
1099 | smp_processor_id(), v , v1); | |
1100 | irq_exit(); | |
1101 | } | |
1102 | ||
1103 | int disable_apic; | |
1104 | ||
1105 | /* | |
1106 | * This initializes the IO-APIC and APIC hardware if this is | |
1107 | * a UP kernel. | |
1108 | */ | |
1109 | int __init APIC_init_uniprocessor (void) | |
1110 | { | |
1111 | if (disable_apic) { | |
1112 | printk(KERN_INFO "Apic disabled\n"); | |
1113 | return -1; | |
1114 | } | |
1115 | if (!cpu_has_apic) { | |
1116 | disable_apic = 1; | |
1117 | printk(KERN_INFO "Apic disabled by BIOS\n"); | |
1118 | return -1; | |
1119 | } | |
1120 | ||
1121 | verify_local_APIC(); | |
1122 | ||
1123 | connect_bsp_APIC(); | |
1124 | ||
357e11d4 | 1125 | phys_cpu_present_map = physid_mask_of_physid(boot_cpu_id); |
11a8e778 | 1126 | apic_write(APIC_ID, SET_APIC_ID(boot_cpu_id)); |
1da177e4 LT |
1127 | |
1128 | setup_local_APIC(); | |
1129 | ||
1da177e4 | 1130 | if (smp_found_config && !skip_ioapic_setup && nr_ioapics) |
7f11d8a5 | 1131 | setup_IO_APIC(); |
1da177e4 LT |
1132 | else |
1133 | nr_ioapics = 0; | |
1da177e4 | 1134 | setup_boot_APIC_clock(); |
75152114 | 1135 | check_nmi_watchdog(); |
1da177e4 LT |
1136 | return 0; |
1137 | } | |
1138 | ||
1139 | static __init int setup_disableapic(char *str) | |
1140 | { | |
1141 | disable_apic = 1; | |
9b41046c | 1142 | return 1; |
1da177e4 LT |
1143 | } |
1144 | ||
1145 | static __init int setup_nolapic(char *str) | |
1146 | { | |
1147 | disable_apic = 1; | |
9b41046c | 1148 | return 1; |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | static __init int setup_noapictimer(char *str) | |
1152 | { | |
73dea47f | 1153 | if (str[0] != ' ' && str[0] != 0) |
9b41046c | 1154 | return 0; |
1da177e4 | 1155 | disable_apic_timer = 1; |
9b41046c | 1156 | return 1; |
1da177e4 LT |
1157 | } |
1158 | ||
73dea47f AK |
1159 | static __init int setup_apicmaintimer(char *str) |
1160 | { | |
1161 | apic_runs_main_timer = 1; | |
1162 | nohpet = 1; | |
9b41046c | 1163 | return 1; |
73dea47f AK |
1164 | } |
1165 | __setup("apicmaintimer", setup_apicmaintimer); | |
1166 | ||
1167 | static __init int setup_noapicmaintimer(char *str) | |
1168 | { | |
1169 | apic_runs_main_timer = -1; | |
9b41046c | 1170 | return 1; |
73dea47f AK |
1171 | } |
1172 | __setup("noapicmaintimer", setup_noapicmaintimer); | |
1173 | ||
0c3749c4 AK |
1174 | static __init int setup_apicpmtimer(char *s) |
1175 | { | |
1176 | apic_calibrate_pmtmr = 1; | |
7fd67843 | 1177 | notsc_setup(NULL); |
0c3749c4 AK |
1178 | return setup_apicmaintimer(NULL); |
1179 | } | |
1180 | __setup("apicpmtimer", setup_apicpmtimer); | |
1181 | ||
1da177e4 LT |
1182 | /* dummy parsing: see setup.c */ |
1183 | ||
1184 | __setup("disableapic", setup_disableapic); | |
1185 | __setup("nolapic", setup_nolapic); /* same as disableapic, for compatibility */ | |
1186 | ||
1187 | __setup("noapictimer", setup_noapictimer); | |
1188 | ||
1189 | /* no "lapic" flag - we only use the lapic when the BIOS tells us so. */ |