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x86, bts: remove bad warning
[linux-2.6.git] / arch / x86 / kernel / mpparse.c
bloba649a4ccad43213ae1bb20cd62b48f65791a6ae7
1 /*
2 * Intel Multiprocessor Specification 1.1 and 1.4
3 * compliant MP-table parsing routines.
4 *
5 * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
6 * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
7 * (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
8 */
9
10 #include <linux/mm.h>
11 #include <linux/init.h>
12 #include <linux/delay.h>
13 #include <linux/bootmem.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/mc146818rtc.h>
16 #include <linux/bitops.h>
17 #include <linux/acpi.h>
18 #include <linux/module.h>
19 #include <linux/smp.h>
20
21 #include <asm/mtrr.h>
22 #include <asm/mpspec.h>
23 #include <asm/pgalloc.h>
24 #include <asm/io_apic.h>
25 #include <asm/proto.h>
26 #include <asm/bios_ebda.h>
27 #include <asm/e820.h>
28 #include <asm/trampoline.h>
29 #include <asm/setup.h>
30 #include <asm/smp.h>
31
32 #include <mach_apic.h>
33 #ifdef CONFIG_X86_32
34 #include <mach_apicdef.h>
35 #include <mach_mpparse.h>
36 #endif
37
38 /*
39 * Checksum an MP configuration block.
40 */
41
42 static int __init mpf_checksum(unsigned char *mp, int len)
43 {
44 int sum = 0;
45
46 while (len--)
47 sum += *mp++;
48
49 return sum & 0xFF;
50 }
51
52 static void __init MP_processor_info(struct mpc_cpu *m)
53 {
54 int apicid;
55 char *bootup_cpu = "";
56
57 if (!(m->cpuflag & CPU_ENABLED)) {
58 disabled_cpus++;
59 return;
60 }
61
62 if (x86_quirks->mpc_apic_id)
63 apicid = x86_quirks->mpc_apic_id(m);
64 else
65 apicid = m->apicid;
66
67 if (m->cpuflag & CPU_BOOTPROCESSOR) {
68 bootup_cpu = " (Bootup-CPU)";
69 boot_cpu_physical_apicid = m->apicid;
70 }
71
72 printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
73 generic_processor_info(apicid, m->apicver);
74 }
75
76 #ifdef CONFIG_X86_IO_APIC
77 static void __init MP_bus_info(struct mpc_bus *m)
78 {
79 char str[7];
80 memcpy(str, m->bustype, 6);
81 str[6] = 0;
82
83 if (x86_quirks->mpc_oem_bus_info)
84 x86_quirks->mpc_oem_bus_info(m, str);
85 else
86 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
87
88 #if MAX_MP_BUSSES < 256
89 if (m->busid >= MAX_MP_BUSSES) {
90 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
91 " is too large, max. supported is %d\n",
92 m->busid, str, MAX_MP_BUSSES - 1);
93 return;
94 }
95 #endif
96
97 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
98 set_bit(m->busid, mp_bus_not_pci);
99 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
100 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
101 #endif
102 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
103 if (x86_quirks->mpc_oem_pci_bus)
104 x86_quirks->mpc_oem_pci_bus(m);
105
106 clear_bit(m->busid, mp_bus_not_pci);
107 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
108 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
109 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
110 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
111 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
112 mp_bus_id_to_type[m->busid] = MP_BUS_MCA;
113 #endif
114 } else
115 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
116 }
117 #endif
118
119 #ifdef CONFIG_X86_IO_APIC
120
121 static int bad_ioapic(unsigned long address)
122 {
123 if (nr_ioapics >= MAX_IO_APICS) {
124 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
125 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
126 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
127 }
128 if (!address) {
129 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
130 " found in table, skipping!\n");
131 return 1;
132 }
133 return 0;
134 }
135
136 static void __init MP_ioapic_info(struct mpc_ioapic *m)
137 {
138 if (!(m->flags & MPC_APIC_USABLE))
139 return;
140
141 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
142 m->apicid, m->apicver, m->apicaddr);
143
144 if (bad_ioapic(m->apicaddr))
145 return;
146
147 mp_ioapics[nr_ioapics].mp_apicaddr = m->apicaddr;
148 mp_ioapics[nr_ioapics].mp_apicid = m->apicid;
149 mp_ioapics[nr_ioapics].mp_type = m->type;
150 mp_ioapics[nr_ioapics].mp_apicver = m->apicver;
151 mp_ioapics[nr_ioapics].mp_flags = m->flags;
152 nr_ioapics++;
153 }
154
155 static void print_MP_intsrc_info(struct mpc_intsrc *m)
156 {
157 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
158 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
159 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
160 m->srcbusirq, m->dstapic, m->dstirq);
161 }
162
163 static void __init print_mp_irq_info(struct mp_config_intsrc *mp_irq)
164 {
165 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
166 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
167 mp_irq->mp_irqtype, mp_irq->mp_irqflag & 3,
168 (mp_irq->mp_irqflag >> 2) & 3, mp_irq->mp_srcbus,
169 mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq);
170 }
171
172 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
173 struct mp_config_intsrc *mp_irq)
174 {
175 mp_irq->mp_dstapic = m->dstapic;
176 mp_irq->mp_type = m->type;
177 mp_irq->mp_irqtype = m->irqtype;
178 mp_irq->mp_irqflag = m->irqflag;
179 mp_irq->mp_srcbus = m->srcbus;
180 mp_irq->mp_srcbusirq = m->srcbusirq;
181 mp_irq->mp_dstirq = m->dstirq;
182 }
183
184 static void __init assign_to_mpc_intsrc(struct mp_config_intsrc *mp_irq,
185 struct mpc_intsrc *m)
186 {
187 m->dstapic = mp_irq->mp_dstapic;
188 m->type = mp_irq->mp_type;
189 m->irqtype = mp_irq->mp_irqtype;
190 m->irqflag = mp_irq->mp_irqflag;
191 m->srcbus = mp_irq->mp_srcbus;
192 m->srcbusirq = mp_irq->mp_srcbusirq;
193 m->dstirq = mp_irq->mp_dstirq;
194 }
195
196 static int __init mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
197 struct mpc_intsrc *m)
198 {
199 if (mp_irq->mp_dstapic != m->dstapic)
200 return 1;
201 if (mp_irq->mp_type != m->type)
202 return 2;
203 if (mp_irq->mp_irqtype != m->irqtype)
204 return 3;
205 if (mp_irq->mp_irqflag != m->irqflag)
206 return 4;
207 if (mp_irq->mp_srcbus != m->srcbus)
208 return 5;
209 if (mp_irq->mp_srcbusirq != m->srcbusirq)
210 return 6;
211 if (mp_irq->mp_dstirq != m->dstirq)
212 return 7;
213
214 return 0;
215 }
216
217 static void __init MP_intsrc_info(struct mpc_intsrc *m)
218 {
219 int i;
220
221 print_MP_intsrc_info(m);
222
223 for (i = 0; i < mp_irq_entries; i++) {
224 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
225 return;
226 }
227
228 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
229 if (++mp_irq_entries == MAX_IRQ_SOURCES)
230 panic("Max # of irq sources exceeded!!\n");
231 }
232
233 #endif
234
235 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
236 {
237 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
238 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
239 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
240 m->srcbusirq, m->destapic, m->destapiclint);
241 }
242
243 /*
244 * Read/parse the MPC
245 */
246
247 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
248 {
249
250 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
251 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
252 mpc->signature[0], mpc->signature[1],
253 mpc->signature[2], mpc->signature[3]);
254 return 0;
255 }
256 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
257 printk(KERN_ERR "MPTABLE: checksum error!\n");
258 return 0;
259 }
260 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
261 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
262 mpc->spec);
263 return 0;
264 }
265 if (!mpc->lapic) {
266 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
267 return 0;
268 }
269 memcpy(oem, mpc->oem, 8);
270 oem[8] = 0;
271 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
272
273 memcpy(str, mpc->productid, 12);
274 str[12] = 0;
275
276 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
277
278 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
279
280 return 1;
281 }
282
283 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
284 {
285 char str[16];
286 char oem[10];
287
288 int count = sizeof(*mpc);
289 unsigned char *mpt = ((unsigned char *)mpc) + count;
290
291 if (!smp_check_mpc(mpc, oem, str))
292 return 0;
293
294 #ifdef CONFIG_X86_32
295 /*
296 * need to make sure summit and es7000's mps_oem_check is safe to be
297 * called early via genericarch 's mps_oem_check
298 */
299 if (early) {
300 #ifdef CONFIG_X86_NUMAQ
301 numaq_mps_oem_check(mpc, oem, str);
302 #endif
303 } else
304 mps_oem_check(mpc, oem, str);
305 #endif
306 /* save the local APIC address, it might be non-default */
307 if (!acpi_lapic)
308 mp_lapic_addr = mpc->lapic;
309
310 if (early)
311 return 1;
312
313 if (mpc->oemptr && x86_quirks->smp_read_mpc_oem) {
314 struct mpc_oemtable *oem_table = (void *)(long)mpc->oemptr;
315 x86_quirks->smp_read_mpc_oem(oem_table, mpc->oemsize);
316 }
317
318 /*
319 * Now process the configuration blocks.
320 */
321 if (x86_quirks->mpc_record)
322 *x86_quirks->mpc_record = 0;
323
324 while (count < mpc->length) {
325 switch (*mpt) {
326 case MP_PROCESSOR:
327 {
328 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
329 /* ACPI may have already provided this data */
330 if (!acpi_lapic)
331 MP_processor_info(m);
332 mpt += sizeof(*m);
333 count += sizeof(*m);
334 break;
335 }
336 case MP_BUS:
337 {
338 struct mpc_bus *m = (struct mpc_bus *)mpt;
339 #ifdef CONFIG_X86_IO_APIC
340 MP_bus_info(m);
341 #endif
342 mpt += sizeof(*m);
343 count += sizeof(*m);
344 break;
345 }
346 case MP_IOAPIC:
347 {
348 #ifdef CONFIG_X86_IO_APIC
349 struct mpc_ioapic *m = (struct mpc_ioapic *)mpt;
350 MP_ioapic_info(m);
351 #endif
352 mpt += sizeof(struct mpc_ioapic);
353 count += sizeof(struct mpc_ioapic);
354 break;
355 }
356 case MP_INTSRC:
357 {
358 #ifdef CONFIG_X86_IO_APIC
359 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
360
361 MP_intsrc_info(m);
362 #endif
363 mpt += sizeof(struct mpc_intsrc);
364 count += sizeof(struct mpc_intsrc);
365 break;
366 }
367 case MP_LINTSRC:
368 {
369 struct mpc_lintsrc *m =
370 (struct mpc_lintsrc *)mpt;
371 MP_lintsrc_info(m);
372 mpt += sizeof(*m);
373 count += sizeof(*m);
374 break;
375 }
376 default:
377 /* wrong mptable */
378 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
379 printk(KERN_ERR "type %x\n", *mpt);
380 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
381 1, mpc, mpc->length, 1);
382 count = mpc->length;
383 break;
384 }
385 if (x86_quirks->mpc_record)
386 (*x86_quirks->mpc_record)++;
387 }
388
389 #ifdef CONFIG_X86_GENERICARCH
390 generic_bigsmp_probe();
391 #endif
392
393 #ifdef CONFIG_X86_32
394 setup_apic_routing();
395 #endif
396 if (!num_processors)
397 printk(KERN_ERR "MPTABLE: no processors registered!\n");
398 return num_processors;
399 }
400
401 #ifdef CONFIG_X86_IO_APIC
402
403 static int __init ELCR_trigger(unsigned int irq)
404 {
405 unsigned int port;
406
407 port = 0x4d0 + (irq >> 3);
408 return (inb(port) >> (irq & 7)) & 1;
409 }
410
411 static void __init construct_default_ioirq_mptable(int mpc_default_type)
412 {
413 struct mpc_intsrc intsrc;
414 int i;
415 int ELCR_fallback = 0;
416
417 intsrc.type = MP_INTSRC;
418 intsrc.irqflag = 0; /* conforming */
419 intsrc.srcbus = 0;
420 intsrc.dstapic = mp_ioapics[0].mp_apicid;
421
422 intsrc.irqtype = mp_INT;
423
424 /*
425 * If true, we have an ISA/PCI system with no IRQ entries
426 * in the MP table. To prevent the PCI interrupts from being set up
427 * incorrectly, we try to use the ELCR. The sanity check to see if
428 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
429 * never be level sensitive, so we simply see if the ELCR agrees.
430 * If it does, we assume it's valid.
431 */
432 if (mpc_default_type == 5) {
433 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
434 "falling back to ELCR\n");
435
436 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
437 ELCR_trigger(13))
438 printk(KERN_ERR "ELCR contains invalid data... "
439 "not using ELCR\n");
440 else {
441 printk(KERN_INFO
442 "Using ELCR to identify PCI interrupts\n");
443 ELCR_fallback = 1;
444 }
445 }
446
447 for (i = 0; i < 16; i++) {
448 switch (mpc_default_type) {
449 case 2:
450 if (i == 0 || i == 13)
451 continue; /* IRQ0 & IRQ13 not connected */
452 /* fall through */
453 default:
454 if (i == 2)
455 continue; /* IRQ2 is never connected */
456 }
457
458 if (ELCR_fallback) {
459 /*
460 * If the ELCR indicates a level-sensitive interrupt, we
461 * copy that information over to the MP table in the
462 * irqflag field (level sensitive, active high polarity).
463 */
464 if (ELCR_trigger(i))
465 intsrc.irqflag = 13;
466 else
467 intsrc.irqflag = 0;
468 }
469
470 intsrc.srcbusirq = i;
471 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
472 MP_intsrc_info(&intsrc);
473 }
474
475 intsrc.irqtype = mp_ExtINT;
476 intsrc.srcbusirq = 0;
477 intsrc.dstirq = 0; /* 8259A to INTIN0 */
478 MP_intsrc_info(&intsrc);
479 }
480
481
482 static void __init construct_ioapic_table(int mpc_default_type)
483 {
484 struct mpc_ioapic ioapic;
485 struct mpc_bus bus;
486
487 bus.type = MP_BUS;
488 bus.busid = 0;
489 switch (mpc_default_type) {
490 default:
491 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
492 mpc_default_type);
493 /* fall through */
494 case 1:
495 case 5:
496 memcpy(bus.bustype, "ISA ", 6);
497 break;
498 case 2:
499 case 6:
500 case 3:
501 memcpy(bus.bustype, "EISA ", 6);
502 break;
503 case 4:
504 case 7:
505 memcpy(bus.bustype, "MCA ", 6);
506 }
507 MP_bus_info(&bus);
508 if (mpc_default_type > 4) {
509 bus.busid = 1;
510 memcpy(bus.bustype, "PCI ", 6);
511 MP_bus_info(&bus);
512 }
513
514 ioapic.type = MP_IOAPIC;
515 ioapic.apicid = 2;
516 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
517 ioapic.flags = MPC_APIC_USABLE;
518 ioapic.apicaddr = 0xFEC00000;
519 MP_ioapic_info(&ioapic);
520
521 /*
522 * We set up most of the low 16 IO-APIC pins according to MPS rules.
523 */
524 construct_default_ioirq_mptable(mpc_default_type);
525 }
526 #else
527 static inline void __init construct_ioapic_table(int mpc_default_type) { }
528 #endif
529
530 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
531 {
532 struct mpc_cpu processor;
533 struct mpc_lintsrc lintsrc;
534 int linttypes[2] = { mp_ExtINT, mp_NMI };
535 int i;
536
537 /*
538 * local APIC has default address
539 */
540 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
541
542 /*
543 * 2 CPUs, numbered 0 & 1.
544 */
545 processor.type = MP_PROCESSOR;
546 /* Either an integrated APIC or a discrete 82489DX. */
547 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
548 processor.cpuflag = CPU_ENABLED;
549 processor.cpufeature = (boot_cpu_data.x86 << 8) |
550 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
551 processor.featureflag = boot_cpu_data.x86_capability[0];
552 processor.reserved[0] = 0;
553 processor.reserved[1] = 0;
554 for (i = 0; i < 2; i++) {
555 processor.apicid = i;
556 MP_processor_info(&processor);
557 }
558
559 construct_ioapic_table(mpc_default_type);
560
561 lintsrc.type = MP_LINTSRC;
562 lintsrc.irqflag = 0; /* conforming */
563 lintsrc.srcbusid = 0;
564 lintsrc.srcbusirq = 0;
565 lintsrc.destapic = MP_APIC_ALL;
566 for (i = 0; i < 2; i++) {
567 lintsrc.irqtype = linttypes[i];
568 lintsrc.destapiclint = i;
569 MP_lintsrc_info(&lintsrc);
570 }
571 }
572
573 static struct intel_mp_floating *mpf_found;
574
575 /*
576 * Scan the memory blocks for an SMP configuration block.
577 */
578 static void __init __get_smp_config(unsigned int early)
579 {
580 struct intel_mp_floating *mpf = mpf_found;
581
582 if (!mpf)
583 return;
584
585 if (acpi_lapic && early)
586 return;
587
588 /*
589 * MPS doesn't support hyperthreading, aka only have
590 * thread 0 apic id in MPS table
591 */
592 if (acpi_lapic && acpi_ioapic)
593 return;
594
595 if (x86_quirks->mach_get_smp_config) {
596 if (x86_quirks->mach_get_smp_config(early))
597 return;
598 }
599
600 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
601 mpf->mpf_specification);
602 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
603 if (mpf->mpf_feature2 & (1 << 7)) {
604 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
605 pic_mode = 1;
606 } else {
607 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
608 pic_mode = 0;
609 }
610 #endif
611 /*
612 * Now see if we need to read further.
613 */
614 if (mpf->mpf_feature1 != 0) {
615 if (early) {
616 /*
617 * local APIC has default address
618 */
619 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
620 return;
621 }
622
623 printk(KERN_INFO "Default MP configuration #%d\n",
624 mpf->mpf_feature1);
625 construct_default_ISA_mptable(mpf->mpf_feature1);
626
627 } else if (mpf->mpf_physptr) {
628
629 /*
630 * Read the physical hardware table. Anything here will
631 * override the defaults.
632 */
633 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
634 #ifdef CONFIG_X86_LOCAL_APIC
635 smp_found_config = 0;
636 #endif
637 printk(KERN_ERR
638 "BIOS bug, MP table errors detected!...\n");
639 printk(KERN_ERR "... disabling SMP support. "
640 "(tell your hw vendor)\n");
641 return;
642 }
643
644 if (early)
645 return;
646 #ifdef CONFIG_X86_IO_APIC
647 /*
648 * If there are no explicit MP IRQ entries, then we are
649 * broken. We set up most of the low 16 IO-APIC pins to
650 * ISA defaults and hope it will work.
651 */
652 if (!mp_irq_entries) {
653 struct mpc_bus bus;
654
655 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
656 "using default mptable. "
657 "(tell your hw vendor)\n");
658
659 bus.type = MP_BUS;
660 bus.busid = 0;
661 memcpy(bus.bustype, "ISA ", 6);
662 MP_bus_info(&bus);
663
664 construct_default_ioirq_mptable(0);
665 }
666 #endif
667 } else
668 BUG();
669
670 if (!early)
671 printk(KERN_INFO "Processors: %d\n", num_processors);
672 /*
673 * Only use the first configuration found.
674 */
675 }
676
677 void __init early_get_smp_config(void)
678 {
679 __get_smp_config(1);
680 }
681
682 void __init get_smp_config(void)
683 {
684 __get_smp_config(0);
685 }
686
687 static int __init smp_scan_config(unsigned long base, unsigned long length,
688 unsigned reserve)
689 {
690 unsigned int *bp = phys_to_virt(base);
691 struct intel_mp_floating *mpf;
692
693 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
694 bp, length);
695 BUILD_BUG_ON(sizeof(*mpf) != 16);
696
697 while (length > 0) {
698 mpf = (struct intel_mp_floating *)bp;
699 if ((*bp == SMP_MAGIC_IDENT) &&
700 (mpf->mpf_length == 1) &&
701 !mpf_checksum((unsigned char *)bp, 16) &&
702 ((mpf->mpf_specification == 1)
703 || (mpf->mpf_specification == 4))) {
704 #ifdef CONFIG_X86_LOCAL_APIC
705 smp_found_config = 1;
706 #endif
707 mpf_found = mpf;
708
709 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
710 mpf, virt_to_phys(mpf));
711
712 if (!reserve)
713 return 1;
714 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
715 BOOTMEM_DEFAULT);
716 if (mpf->mpf_physptr) {
717 unsigned long size = PAGE_SIZE;
718 #ifdef CONFIG_X86_32
719 /*
720 * We cannot access to MPC table to compute
721 * table size yet, as only few megabytes from
722 * the bottom is mapped now.
723 * PC-9800's MPC table places on the very last
724 * of physical memory; so that simply reserving
725 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
726 * in reserve_bootmem.
727 */
728 unsigned long end = max_low_pfn * PAGE_SIZE;
729 if (mpf->mpf_physptr + size > end)
730 size = end - mpf->mpf_physptr;
731 #endif
732 reserve_bootmem_generic(mpf->mpf_physptr, size,
733 BOOTMEM_DEFAULT);
734 }
735
736 return 1;
737 }
738 bp += 4;
739 length -= 16;
740 }
741 return 0;
742 }
743
744 static void __init __find_smp_config(unsigned int reserve)
745 {
746 unsigned int address;
747
748 if (x86_quirks->mach_find_smp_config) {
749 if (x86_quirks->mach_find_smp_config(reserve))
750 return;
751 }
752 /*
753 * FIXME: Linux assumes you have 640K of base ram..
754 * this continues the error...
755 *
756 * 1) Scan the bottom 1K for a signature
757 * 2) Scan the top 1K of base RAM
758 * 3) Scan the 64K of bios
759 */
760 if (smp_scan_config(0x0, 0x400, reserve) ||
761 smp_scan_config(639 * 0x400, 0x400, reserve) ||
762 smp_scan_config(0xF0000, 0x10000, reserve))
763 return;
764 /*
765 * If it is an SMP machine we should know now, unless the
766 * configuration is in an EISA/MCA bus machine with an
767 * extended bios data area.
768 *
769 * there is a real-mode segmented pointer pointing to the
770 * 4K EBDA area at 0x40E, calculate and scan it here.
771 *
772 * NOTE! There are Linux loaders that will corrupt the EBDA
773 * area, and as such this kind of SMP config may be less
774 * trustworthy, simply because the SMP table may have been
775 * stomped on during early boot. These loaders are buggy and
776 * should be fixed.
777 *
778 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
779 */
780
781 address = get_bios_ebda();
782 if (address)
783 smp_scan_config(address, 0x400, reserve);
784 }
785
786 void __init early_find_smp_config(void)
787 {
788 __find_smp_config(0);
789 }
790
791 void __init find_smp_config(void)
792 {
793 __find_smp_config(1);
794 }
795
796 #ifdef CONFIG_X86_IO_APIC
797 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
798
799 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
800 {
801 int i;
802
803 if (m->irqtype != mp_INT)
804 return 0;
805
806 if (m->irqflag != 0x0f)
807 return 0;
808
809 /* not legacy */
810
811 for (i = 0; i < mp_irq_entries; i++) {
812 if (mp_irqs[i].mp_irqtype != mp_INT)
813 continue;
814
815 if (mp_irqs[i].mp_irqflag != 0x0f)
816 continue;
817
818 if (mp_irqs[i].mp_srcbus != m->srcbus)
819 continue;
820 if (mp_irqs[i].mp_srcbusirq != m->srcbusirq)
821 continue;
822 if (irq_used[i]) {
823 /* already claimed */
824 return -2;
825 }
826 irq_used[i] = 1;
827 return i;
828 }
829
830 /* not found */
831 return -1;
832 }
833
834 #define SPARE_SLOT_NUM 20
835
836 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
837 #endif
838
839 static int __init replace_intsrc_all(struct mpc_table *mpc,
840 unsigned long mpc_new_phys,
841 unsigned long mpc_new_length)
842 {
843 #ifdef CONFIG_X86_IO_APIC
844 int i;
845 int nr_m_spare = 0;
846 #endif
847
848 int count = sizeof(*mpc);
849 unsigned char *mpt = ((unsigned char *)mpc) + count;
850
851 printk(KERN_INFO "mpc_length %x\n", mpc->length);
852 while (count < mpc->length) {
853 switch (*mpt) {
854 case MP_PROCESSOR:
855 {
856 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
857 mpt += sizeof(*m);
858 count += sizeof(*m);
859 break;
860 }
861 case MP_BUS:
862 {
863 struct mpc_bus *m = (struct mpc_bus *)mpt;
864 mpt += sizeof(*m);
865 count += sizeof(*m);
866 break;
867 }
868 case MP_IOAPIC:
869 {
870 mpt += sizeof(struct mpc_ioapic);
871 count += sizeof(struct mpc_ioapic);
872 break;
873 }
874 case MP_INTSRC:
875 {
876 #ifdef CONFIG_X86_IO_APIC
877 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
878
879 printk(KERN_INFO "OLD ");
880 print_MP_intsrc_info(m);
881 i = get_MP_intsrc_index(m);
882 if (i > 0) {
883 assign_to_mpc_intsrc(&mp_irqs[i], m);
884 printk(KERN_INFO "NEW ");
885 print_mp_irq_info(&mp_irqs[i]);
886 } else if (!i) {
887 /* legacy, do nothing */
888 } else if (nr_m_spare < SPARE_SLOT_NUM) {
889 /*
890 * not found (-1), or duplicated (-2)
891 * are invalid entries,
892 * we need to use the slot later
893 */
894 m_spare[nr_m_spare] = m;
895 nr_m_spare++;
896 }
897 #endif
898 mpt += sizeof(struct mpc_intsrc);
899 count += sizeof(struct mpc_intsrc);
900 break;
901 }
902 case MP_LINTSRC:
903 {
904 struct mpc_lintsrc *m =
905 (struct mpc_lintsrc *)mpt;
906 mpt += sizeof(*m);
907 count += sizeof(*m);
908 break;
909 }
910 default:
911 /* wrong mptable */
912 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
913 printk(KERN_ERR "type %x\n", *mpt);
914 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
915 1, mpc, mpc->length, 1);
916 goto out;
917 }
918 }
919
920 #ifdef CONFIG_X86_IO_APIC
921 for (i = 0; i < mp_irq_entries; i++) {
922 if (irq_used[i])
923 continue;
924
925 if (mp_irqs[i].mp_irqtype != mp_INT)
926 continue;
927
928 if (mp_irqs[i].mp_irqflag != 0x0f)
929 continue;
930
931 if (nr_m_spare > 0) {
932 printk(KERN_INFO "*NEW* found ");
933 nr_m_spare--;
934 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
935 m_spare[nr_m_spare] = NULL;
936 } else {
937 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
938 count += sizeof(struct mpc_intsrc);
939 if (!mpc_new_phys) {
940 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
941 } else {
942 if (count <= mpc_new_length)
943 printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
944 else {
945 printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
946 goto out;
947 }
948 }
949 assign_to_mpc_intsrc(&mp_irqs[i], m);
950 mpc->length = count;
951 mpt += sizeof(struct mpc_intsrc);
952 }
953 print_mp_irq_info(&mp_irqs[i]);
954 }
955 #endif
956 out:
957 /* update checksum */
958 mpc->checksum = 0;
959 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
960
961 return 0;
962 }
963
964 static int __initdata enable_update_mptable;
965
966 static int __init update_mptable_setup(char *str)
967 {
968 enable_update_mptable = 1;
969 return 0;
970 }
971 early_param("update_mptable", update_mptable_setup);
972
973 static unsigned long __initdata mpc_new_phys;
974 static unsigned long mpc_new_length __initdata = 4096;
975
976 /* alloc_mptable or alloc_mptable=4k */
977 static int __initdata alloc_mptable;
978 static int __init parse_alloc_mptable_opt(char *p)
979 {
980 enable_update_mptable = 1;
981 alloc_mptable = 1;
982 if (!p)
983 return 0;
984 mpc_new_length = memparse(p, &p);
985 return 0;
986 }
987 early_param("alloc_mptable", parse_alloc_mptable_opt);
988
989 void __init early_reserve_e820_mpc_new(void)
990 {
991 if (enable_update_mptable && alloc_mptable) {
992 u64 startt = 0;
993 #ifdef CONFIG_X86_TRAMPOLINE
994 startt = TRAMPOLINE_BASE;
995 #endif
996 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
997 }
998 }
999
1000 static int __init update_mp_table(void)
1001 {
1002 char str[16];
1003 char oem[10];
1004 struct intel_mp_floating *mpf;
1005 struct mpc_table *mpc, *mpc_new;
1006
1007 if (!enable_update_mptable)
1008 return 0;
1009
1010 mpf = mpf_found;
1011 if (!mpf)
1012 return 0;
1013
1014 /*
1015 * Now see if we need to go further.
1016 */
1017 if (mpf->mpf_feature1 != 0)
1018 return 0;
1019
1020 if (!mpf->mpf_physptr)
1021 return 0;
1022
1023 mpc = phys_to_virt(mpf->mpf_physptr);
1024
1025 if (!smp_check_mpc(mpc, oem, str))
1026 return 0;
1027
1028 printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1029 printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
1030
1031 if (mpc_new_phys && mpc->length > mpc_new_length) {
1032 mpc_new_phys = 0;
1033 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1034 mpc_new_length);
1035 }
1036
1037 if (!mpc_new_phys) {
1038 unsigned char old, new;
1039 /* check if we can change the postion */
1040 mpc->checksum = 0;
1041 old = mpf_checksum((unsigned char *)mpc, mpc->length);
1042 mpc->checksum = 0xff;
1043 new = mpf_checksum((unsigned char *)mpc, mpc->length);
1044 if (old == new) {
1045 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1046 return 0;
1047 }
1048 printk(KERN_INFO "use in-positon replacing\n");
1049 } else {
1050 mpf->mpf_physptr = mpc_new_phys;
1051 mpc_new = phys_to_virt(mpc_new_phys);
1052 memcpy(mpc_new, mpc, mpc->length);
1053 mpc = mpc_new;
1054 /* check if we can modify that */
1055 if (mpc_new_phys - mpf->mpf_physptr) {
1056 struct intel_mp_floating *mpf_new;
1057 /* steal 16 bytes from [0, 1k) */
1058 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1059 mpf_new = phys_to_virt(0x400 - 16);
1060 memcpy(mpf_new, mpf, 16);
1061 mpf = mpf_new;
1062 mpf->mpf_physptr = mpc_new_phys;
1063 }
1064 mpf->mpf_checksum = 0;
1065 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
1066 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
1067 }
1068
1069 /*
1070 * only replace the one with mp_INT and
1071 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1072 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1073 * may need pci=routeirq for all coverage
1074 */
1075 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1076
1077 return 0;
1078 }
1079
1080 late_initcall(update_mp_table);
Linus' kernel tree