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x86: Handle overlapping mptables
[linux-2.6/kvm.git] / arch / x86 / kernel / mpparse.c
blobe81030f71a8f5bf8480c9902d63ca5c2b766671b
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, 2009 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 #include <linux/pci.h>
21
22 #include <asm/mtrr.h>
23 #include <asm/mpspec.h>
24 #include <asm/pgalloc.h>
25 #include <asm/io_apic.h>
26 #include <asm/proto.h>
27 #include <asm/bios_ebda.h>
28 #include <asm/e820.h>
29 #include <asm/trampoline.h>
30 #include <asm/setup.h>
31 #include <asm/smp.h>
32
33 #include <asm/apic.h>
34 /*
35 * Checksum an MP configuration block.
36 */
37
38 static int __init mpf_checksum(unsigned char *mp, int len)
39 {
40 int sum = 0;
41
42 while (len--)
43 sum += *mp++;
44
45 return sum & 0xFF;
46 }
47
48 int __init default_mpc_apic_id(struct mpc_cpu *m)
49 {
50 return m->apicid;
51 }
52
53 static void __init MP_processor_info(struct mpc_cpu *m)
54 {
55 int apicid;
56 char *bootup_cpu = "";
57
58 if (!(m->cpuflag & CPU_ENABLED)) {
59 disabled_cpus++;
60 return;
61 }
62
63 apicid = x86_init.mpparse.mpc_apic_id(m);
64
65 if (m->cpuflag & CPU_BOOTPROCESSOR) {
66 bootup_cpu = " (Bootup-CPU)";
67 boot_cpu_physical_apicid = m->apicid;
68 }
69
70 printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
71 generic_processor_info(apicid, m->apicver);
72 }
73
74 #ifdef CONFIG_X86_IO_APIC
75 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
76 {
77 memcpy(str, m->bustype, 6);
78 str[6] = 0;
79 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
80 }
81
82 static void __init MP_bus_info(struct mpc_bus *m)
83 {
84 char str[7];
85
86 x86_init.mpparse.mpc_oem_bus_info(m, 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_init.mpparse.mpc_oem_pci_bus)
104 x86_init.mpparse.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
118 static int bad_ioapic(unsigned long address)
119 {
120 if (nr_ioapics >= MAX_IO_APICS) {
121 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
122 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
123 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
124 }
125 if (!address) {
126 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
127 " found in table, skipping!\n");
128 return 1;
129 }
130 return 0;
131 }
132
133 static void __init MP_ioapic_info(struct mpc_ioapic *m)
134 {
135 if (!(m->flags & MPC_APIC_USABLE))
136 return;
137
138 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
139 m->apicid, m->apicver, m->apicaddr);
140
141 if (bad_ioapic(m->apicaddr))
142 return;
143
144 mp_ioapics[nr_ioapics].apicaddr = m->apicaddr;
145 mp_ioapics[nr_ioapics].apicid = m->apicid;
146 mp_ioapics[nr_ioapics].type = m->type;
147 mp_ioapics[nr_ioapics].apicver = m->apicver;
148 mp_ioapics[nr_ioapics].flags = m->flags;
149 nr_ioapics++;
150 }
151
152 static void print_MP_intsrc_info(struct mpc_intsrc *m)
153 {
154 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
155 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
156 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
157 m->srcbusirq, m->dstapic, m->dstirq);
158 }
159
160 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
161 {
162 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
163 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
164 mp_irq->irqtype, mp_irq->irqflag & 3,
165 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
166 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
167 }
168
169 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
170 struct mpc_intsrc *mp_irq)
171 {
172 mp_irq->dstapic = m->dstapic;
173 mp_irq->type = m->type;
174 mp_irq->irqtype = m->irqtype;
175 mp_irq->irqflag = m->irqflag;
176 mp_irq->srcbus = m->srcbus;
177 mp_irq->srcbusirq = m->srcbusirq;
178 mp_irq->dstirq = m->dstirq;
179 }
180
181 static void __init assign_to_mpc_intsrc(struct mpc_intsrc *mp_irq,
182 struct mpc_intsrc *m)
183 {
184 m->dstapic = mp_irq->dstapic;
185 m->type = mp_irq->type;
186 m->irqtype = mp_irq->irqtype;
187 m->irqflag = mp_irq->irqflag;
188 m->srcbus = mp_irq->srcbus;
189 m->srcbusirq = mp_irq->srcbusirq;
190 m->dstirq = mp_irq->dstirq;
191 }
192
193 static int __init mp_irq_mpc_intsrc_cmp(struct mpc_intsrc *mp_irq,
194 struct mpc_intsrc *m)
195 {
196 if (mp_irq->dstapic != m->dstapic)
197 return 1;
198 if (mp_irq->type != m->type)
199 return 2;
200 if (mp_irq->irqtype != m->irqtype)
201 return 3;
202 if (mp_irq->irqflag != m->irqflag)
203 return 4;
204 if (mp_irq->srcbus != m->srcbus)
205 return 5;
206 if (mp_irq->srcbusirq != m->srcbusirq)
207 return 6;
208 if (mp_irq->dstirq != m->dstirq)
209 return 7;
210
211 return 0;
212 }
213
214 static void __init MP_intsrc_info(struct mpc_intsrc *m)
215 {
216 int i;
217
218 print_MP_intsrc_info(m);
219
220 for (i = 0; i < mp_irq_entries; i++) {
221 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
222 return;
223 }
224
225 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
226 if (++mp_irq_entries == MAX_IRQ_SOURCES)
227 panic("Max # of irq sources exceeded!!\n");
228 }
229 #else /* CONFIG_X86_IO_APIC */
230 static inline void __init MP_bus_info(struct mpc_bus *m) {}
231 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
232 static inline void __init MP_intsrc_info(struct mpc_intsrc *m) {}
233 #endif /* CONFIG_X86_IO_APIC */
234
235
236 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
237 {
238 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
239 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
240 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
241 m->srcbusirq, m->destapic, m->destapiclint);
242 }
243
244 /*
245 * Read/parse the MPC
246 */
247
248 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
249 {
250
251 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
252 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
253 mpc->signature[0], mpc->signature[1],
254 mpc->signature[2], mpc->signature[3]);
255 return 0;
256 }
257 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
258 printk(KERN_ERR "MPTABLE: checksum error!\n");
259 return 0;
260 }
261 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
262 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
263 mpc->spec);
264 return 0;
265 }
266 if (!mpc->lapic) {
267 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
268 return 0;
269 }
270 memcpy(oem, mpc->oem, 8);
271 oem[8] = 0;
272 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
273
274 memcpy(str, mpc->productid, 12);
275 str[12] = 0;
276
277 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
278
279 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
280
281 return 1;
282 }
283
284 static void skip_entry(unsigned char **ptr, int *count, int size)
285 {
286 *ptr += size;
287 *count += size;
288 }
289
290 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
291 {
292 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
293 "type %x\n", *mpt);
294 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
295 1, mpc, mpc->length, 1);
296 }
297
298 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
299
300 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
301 {
302 char str[16];
303 char oem[10];
304
305 int count = sizeof(*mpc);
306 unsigned char *mpt = ((unsigned char *)mpc) + count;
307
308 if (!smp_check_mpc(mpc, oem, str))
309 return 0;
310
311 #ifdef CONFIG_X86_32
312 generic_mps_oem_check(mpc, oem, str);
313 #endif
314 /* save the local APIC address, it might be non-default */
315 if (!acpi_lapic)
316 mp_lapic_addr = mpc->lapic;
317
318 if (early)
319 return 1;
320
321 if (mpc->oemptr)
322 x86_init.mpparse.smp_read_mpc_oem(mpc);
323
324 /*
325 * Now process the configuration blocks.
326 */
327 x86_init.mpparse.mpc_record(0);
328
329 while (count < mpc->length) {
330 switch (*mpt) {
331 case MP_PROCESSOR:
332 /* ACPI may have already provided this data */
333 if (!acpi_lapic)
334 MP_processor_info((struct mpc_cpu *)mpt);
335 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
336 break;
337 case MP_BUS:
338 MP_bus_info((struct mpc_bus *)mpt);
339 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
340 break;
341 case MP_IOAPIC:
342 MP_ioapic_info((struct mpc_ioapic *)mpt);
343 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
344 break;
345 case MP_INTSRC:
346 MP_intsrc_info((struct mpc_intsrc *)mpt);
347 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
348 break;
349 case MP_LINTSRC:
350 MP_lintsrc_info((struct mpc_lintsrc *)mpt);
351 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
352 break;
353 default:
354 /* wrong mptable */
355 smp_dump_mptable(mpc, mpt);
356 count = mpc->length;
357 break;
358 }
359 x86_init.mpparse.mpc_record(1);
360 }
361
362 if (!num_processors)
363 printk(KERN_ERR "MPTABLE: no processors registered!\n");
364 return num_processors;
365 }
366
367 #ifdef CONFIG_X86_IO_APIC
368
369 static int __init ELCR_trigger(unsigned int irq)
370 {
371 unsigned int port;
372
373 port = 0x4d0 + (irq >> 3);
374 return (inb(port) >> (irq & 7)) & 1;
375 }
376
377 static void __init construct_default_ioirq_mptable(int mpc_default_type)
378 {
379 struct mpc_intsrc intsrc;
380 int i;
381 int ELCR_fallback = 0;
382
383 intsrc.type = MP_INTSRC;
384 intsrc.irqflag = 0; /* conforming */
385 intsrc.srcbus = 0;
386 intsrc.dstapic = mp_ioapics[0].apicid;
387
388 intsrc.irqtype = mp_INT;
389
390 /*
391 * If true, we have an ISA/PCI system with no IRQ entries
392 * in the MP table. To prevent the PCI interrupts from being set up
393 * incorrectly, we try to use the ELCR. The sanity check to see if
394 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
395 * never be level sensitive, so we simply see if the ELCR agrees.
396 * If it does, we assume it's valid.
397 */
398 if (mpc_default_type == 5) {
399 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
400 "falling back to ELCR\n");
401
402 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
403 ELCR_trigger(13))
404 printk(KERN_ERR "ELCR contains invalid data... "
405 "not using ELCR\n");
406 else {
407 printk(KERN_INFO
408 "Using ELCR to identify PCI interrupts\n");
409 ELCR_fallback = 1;
410 }
411 }
412
413 for (i = 0; i < 16; i++) {
414 switch (mpc_default_type) {
415 case 2:
416 if (i == 0 || i == 13)
417 continue; /* IRQ0 & IRQ13 not connected */
418 /* fall through */
419 default:
420 if (i == 2)
421 continue; /* IRQ2 is never connected */
422 }
423
424 if (ELCR_fallback) {
425 /*
426 * If the ELCR indicates a level-sensitive interrupt, we
427 * copy that information over to the MP table in the
428 * irqflag field (level sensitive, active high polarity).
429 */
430 if (ELCR_trigger(i))
431 intsrc.irqflag = 13;
432 else
433 intsrc.irqflag = 0;
434 }
435
436 intsrc.srcbusirq = i;
437 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
438 MP_intsrc_info(&intsrc);
439 }
440
441 intsrc.irqtype = mp_ExtINT;
442 intsrc.srcbusirq = 0;
443 intsrc.dstirq = 0; /* 8259A to INTIN0 */
444 MP_intsrc_info(&intsrc);
445 }
446
447
448 static void __init construct_ioapic_table(int mpc_default_type)
449 {
450 struct mpc_ioapic ioapic;
451 struct mpc_bus bus;
452
453 bus.type = MP_BUS;
454 bus.busid = 0;
455 switch (mpc_default_type) {
456 default:
457 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
458 mpc_default_type);
459 /* fall through */
460 case 1:
461 case 5:
462 memcpy(bus.bustype, "ISA ", 6);
463 break;
464 case 2:
465 case 6:
466 case 3:
467 memcpy(bus.bustype, "EISA ", 6);
468 break;
469 case 4:
470 case 7:
471 memcpy(bus.bustype, "MCA ", 6);
472 }
473 MP_bus_info(&bus);
474 if (mpc_default_type > 4) {
475 bus.busid = 1;
476 memcpy(bus.bustype, "PCI ", 6);
477 MP_bus_info(&bus);
478 }
479
480 ioapic.type = MP_IOAPIC;
481 ioapic.apicid = 2;
482 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
483 ioapic.flags = MPC_APIC_USABLE;
484 ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
485 MP_ioapic_info(&ioapic);
486
487 /*
488 * We set up most of the low 16 IO-APIC pins according to MPS rules.
489 */
490 construct_default_ioirq_mptable(mpc_default_type);
491 }
492 #else
493 static inline void __init construct_ioapic_table(int mpc_default_type) { }
494 #endif
495
496 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
497 {
498 struct mpc_cpu processor;
499 struct mpc_lintsrc lintsrc;
500 int linttypes[2] = { mp_ExtINT, mp_NMI };
501 int i;
502
503 /*
504 * local APIC has default address
505 */
506 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
507
508 /*
509 * 2 CPUs, numbered 0 & 1.
510 */
511 processor.type = MP_PROCESSOR;
512 /* Either an integrated APIC or a discrete 82489DX. */
513 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
514 processor.cpuflag = CPU_ENABLED;
515 processor.cpufeature = (boot_cpu_data.x86 << 8) |
516 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
517 processor.featureflag = boot_cpu_data.x86_capability[0];
518 processor.reserved[0] = 0;
519 processor.reserved[1] = 0;
520 for (i = 0; i < 2; i++) {
521 processor.apicid = i;
522 MP_processor_info(&processor);
523 }
524
525 construct_ioapic_table(mpc_default_type);
526
527 lintsrc.type = MP_LINTSRC;
528 lintsrc.irqflag = 0; /* conforming */
529 lintsrc.srcbusid = 0;
530 lintsrc.srcbusirq = 0;
531 lintsrc.destapic = MP_APIC_ALL;
532 for (i = 0; i < 2; i++) {
533 lintsrc.irqtype = linttypes[i];
534 lintsrc.destapiclint = i;
535 MP_lintsrc_info(&lintsrc);
536 }
537 }
538
539 static struct mpf_intel *mpf_found;
540
541 static unsigned long __init get_mpc_size(unsigned long physptr)
542 {
543 struct mpc_table *mpc;
544 unsigned long size;
545
546 mpc = early_ioremap(physptr, PAGE_SIZE);
547 size = mpc->length;
548 early_iounmap(mpc, PAGE_SIZE);
549 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
550
551 return size;
552 }
553
554 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
555 {
556 struct mpc_table *mpc;
557 unsigned long size;
558
559 size = get_mpc_size(mpf->physptr);
560 mpc = early_ioremap(mpf->physptr, size);
561 /*
562 * Read the physical hardware table. Anything here will
563 * override the defaults.
564 */
565 if (!smp_read_mpc(mpc, early)) {
566 #ifdef CONFIG_X86_LOCAL_APIC
567 smp_found_config = 0;
568 #endif
569 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
570 "... disabling SMP support. (tell your hw vendor)\n");
571 early_iounmap(mpc, size);
572 return -1;
573 }
574 early_iounmap(mpc, size);
575
576 if (early)
577 return -1;
578
579 #ifdef CONFIG_X86_IO_APIC
580 /*
581 * If there are no explicit MP IRQ entries, then we are
582 * broken. We set up most of the low 16 IO-APIC pins to
583 * ISA defaults and hope it will work.
584 */
585 if (!mp_irq_entries) {
586 struct mpc_bus bus;
587
588 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
589 "using default mptable. (tell your hw vendor)\n");
590
591 bus.type = MP_BUS;
592 bus.busid = 0;
593 memcpy(bus.bustype, "ISA ", 6);
594 MP_bus_info(&bus);
595
596 construct_default_ioirq_mptable(0);
597 }
598 #endif
599
600 return 0;
601 }
602
603 /*
604 * Scan the memory blocks for an SMP configuration block.
605 */
606 void __init default_get_smp_config(unsigned int early)
607 {
608 struct mpf_intel *mpf = mpf_found;
609
610 if (!mpf)
611 return;
612
613 if (acpi_lapic && early)
614 return;
615
616 /*
617 * MPS doesn't support hyperthreading, aka only have
618 * thread 0 apic id in MPS table
619 */
620 if (acpi_lapic && acpi_ioapic)
621 return;
622
623 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
624 mpf->specification);
625 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
626 if (mpf->feature2 & (1 << 7)) {
627 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
628 pic_mode = 1;
629 } else {
630 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
631 pic_mode = 0;
632 }
633 #endif
634 /*
635 * Now see if we need to read further.
636 */
637 if (mpf->feature1 != 0) {
638 if (early) {
639 /*
640 * local APIC has default address
641 */
642 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
643 return;
644 }
645
646 printk(KERN_INFO "Default MP configuration #%d\n",
647 mpf->feature1);
648 construct_default_ISA_mptable(mpf->feature1);
649
650 } else if (mpf->physptr) {
651 if (check_physptr(mpf, early))
652 return;
653 } else
654 BUG();
655
656 if (!early)
657 printk(KERN_INFO "Processors: %d\n", num_processors);
658 /*
659 * Only use the first configuration found.
660 */
661 }
662
663 static void __init smp_reserve_memory(struct mpf_intel *mpf)
664 {
665 unsigned long size = get_mpc_size(mpf->physptr);
666
667 reserve_early_overlap_ok(mpf->physptr, mpf->physptr+size, "MP-table mpc");
668 }
669
670 static int __init smp_scan_config(unsigned long base, unsigned long length)
671 {
672 unsigned int *bp = phys_to_virt(base);
673 struct mpf_intel *mpf;
674 unsigned long mem;
675
676 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
677 bp, length);
678 BUILD_BUG_ON(sizeof(*mpf) != 16);
679
680 while (length > 0) {
681 mpf = (struct mpf_intel *)bp;
682 if ((*bp == SMP_MAGIC_IDENT) &&
683 (mpf->length == 1) &&
684 !mpf_checksum((unsigned char *)bp, 16) &&
685 ((mpf->specification == 1)
686 || (mpf->specification == 4))) {
687 #ifdef CONFIG_X86_LOCAL_APIC
688 smp_found_config = 1;
689 #endif
690 mpf_found = mpf;
691
692 printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
693 mpf, (u64)virt_to_phys(mpf));
694
695 mem = virt_to_phys(mpf);
696 reserve_early_overlap_ok(mem, mem + sizeof(*mpf), "MP-table mpf");
697 if (mpf->physptr)
698 smp_reserve_memory(mpf);
699
700 return 1;
701 }
702 bp += 4;
703 length -= 16;
704 }
705 return 0;
706 }
707
708 void __init default_find_smp_config(void)
709 {
710 unsigned int address;
711
712 /*
713 * FIXME: Linux assumes you have 640K of base ram..
714 * this continues the error...
715 *
716 * 1) Scan the bottom 1K for a signature
717 * 2) Scan the top 1K of base RAM
718 * 3) Scan the 64K of bios
719 */
720 if (smp_scan_config(0x0, 0x400) ||
721 smp_scan_config(639 * 0x400, 0x400) ||
722 smp_scan_config(0xF0000, 0x10000))
723 return;
724 /*
725 * If it is an SMP machine we should know now, unless the
726 * configuration is in an EISA/MCA bus machine with an
727 * extended bios data area.
728 *
729 * there is a real-mode segmented pointer pointing to the
730 * 4K EBDA area at 0x40E, calculate and scan it here.
731 *
732 * NOTE! There are Linux loaders that will corrupt the EBDA
733 * area, and as such this kind of SMP config may be less
734 * trustworthy, simply because the SMP table may have been
735 * stomped on during early boot. These loaders are buggy and
736 * should be fixed.
737 *
738 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
739 */
740
741 address = get_bios_ebda();
742 if (address)
743 smp_scan_config(address, 0x400);
744 }
745
746 #ifdef CONFIG_X86_IO_APIC
747 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
748
749 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
750 {
751 int i;
752
753 if (m->irqtype != mp_INT)
754 return 0;
755
756 if (m->irqflag != 0x0f)
757 return 0;
758
759 /* not legacy */
760
761 for (i = 0; i < mp_irq_entries; i++) {
762 if (mp_irqs[i].irqtype != mp_INT)
763 continue;
764
765 if (mp_irqs[i].irqflag != 0x0f)
766 continue;
767
768 if (mp_irqs[i].srcbus != m->srcbus)
769 continue;
770 if (mp_irqs[i].srcbusirq != m->srcbusirq)
771 continue;
772 if (irq_used[i]) {
773 /* already claimed */
774 return -2;
775 }
776 irq_used[i] = 1;
777 return i;
778 }
779
780 /* not found */
781 return -1;
782 }
783
784 #define SPARE_SLOT_NUM 20
785
786 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
787
788 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
789 {
790 int i;
791
792 apic_printk(APIC_VERBOSE, "OLD ");
793 print_MP_intsrc_info(m);
794
795 i = get_MP_intsrc_index(m);
796 if (i > 0) {
797 assign_to_mpc_intsrc(&mp_irqs[i], m);
798 apic_printk(APIC_VERBOSE, "NEW ");
799 print_mp_irq_info(&mp_irqs[i]);
800 return;
801 }
802 if (!i) {
803 /* legacy, do nothing */
804 return;
805 }
806 if (*nr_m_spare < SPARE_SLOT_NUM) {
807 /*
808 * not found (-1), or duplicated (-2) are invalid entries,
809 * we need to use the slot later
810 */
811 m_spare[*nr_m_spare] = m;
812 *nr_m_spare += 1;
813 }
814 }
815 #else /* CONFIG_X86_IO_APIC */
816 static
817 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
818 #endif /* CONFIG_X86_IO_APIC */
819
820 static int
821 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
822 {
823 int ret = 0;
824
825 if (!mpc_new_phys || count <= mpc_new_length) {
826 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
827 return -1;
828 }
829
830 return ret;
831 }
832
833 static int __init replace_intsrc_all(struct mpc_table *mpc,
834 unsigned long mpc_new_phys,
835 unsigned long mpc_new_length)
836 {
837 #ifdef CONFIG_X86_IO_APIC
838 int i;
839 #endif
840 int count = sizeof(*mpc);
841 int nr_m_spare = 0;
842 unsigned char *mpt = ((unsigned char *)mpc) + count;
843
844 printk(KERN_INFO "mpc_length %x\n", mpc->length);
845 while (count < mpc->length) {
846 switch (*mpt) {
847 case MP_PROCESSOR:
848 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
849 break;
850 case MP_BUS:
851 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
852 break;
853 case MP_IOAPIC:
854 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
855 break;
856 case MP_INTSRC:
857 check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
858 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
859 break;
860 case MP_LINTSRC:
861 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
862 break;
863 default:
864 /* wrong mptable */
865 smp_dump_mptable(mpc, mpt);
866 goto out;
867 }
868 }
869
870 #ifdef CONFIG_X86_IO_APIC
871 for (i = 0; i < mp_irq_entries; i++) {
872 if (irq_used[i])
873 continue;
874
875 if (mp_irqs[i].irqtype != mp_INT)
876 continue;
877
878 if (mp_irqs[i].irqflag != 0x0f)
879 continue;
880
881 if (nr_m_spare > 0) {
882 apic_printk(APIC_VERBOSE, "*NEW* found\n");
883 nr_m_spare--;
884 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
885 m_spare[nr_m_spare] = NULL;
886 } else {
887 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
888 count += sizeof(struct mpc_intsrc);
889 if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
890 goto out;
891 assign_to_mpc_intsrc(&mp_irqs[i], m);
892 mpc->length = count;
893 mpt += sizeof(struct mpc_intsrc);
894 }
895 print_mp_irq_info(&mp_irqs[i]);
896 }
897 #endif
898 out:
899 /* update checksum */
900 mpc->checksum = 0;
901 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
902
903 return 0;
904 }
905
906 int enable_update_mptable;
907
908 static int __init update_mptable_setup(char *str)
909 {
910 enable_update_mptable = 1;
911 #ifdef CONFIG_PCI
912 pci_routeirq = 1;
913 #endif
914 return 0;
915 }
916 early_param("update_mptable", update_mptable_setup);
917
918 static unsigned long __initdata mpc_new_phys;
919 static unsigned long mpc_new_length __initdata = 4096;
920
921 /* alloc_mptable or alloc_mptable=4k */
922 static int __initdata alloc_mptable;
923 static int __init parse_alloc_mptable_opt(char *p)
924 {
925 enable_update_mptable = 1;
926 #ifdef CONFIG_PCI
927 pci_routeirq = 1;
928 #endif
929 alloc_mptable = 1;
930 if (!p)
931 return 0;
932 mpc_new_length = memparse(p, &p);
933 return 0;
934 }
935 early_param("alloc_mptable", parse_alloc_mptable_opt);
936
937 void __init early_reserve_e820_mpc_new(void)
938 {
939 if (enable_update_mptable && alloc_mptable) {
940 u64 startt = 0;
941 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
942 }
943 }
944
945 static int __init update_mp_table(void)
946 {
947 char str[16];
948 char oem[10];
949 struct mpf_intel *mpf;
950 struct mpc_table *mpc, *mpc_new;
951
952 if (!enable_update_mptable)
953 return 0;
954
955 mpf = mpf_found;
956 if (!mpf)
957 return 0;
958
959 /*
960 * Now see if we need to go further.
961 */
962 if (mpf->feature1 != 0)
963 return 0;
964
965 if (!mpf->physptr)
966 return 0;
967
968 mpc = phys_to_virt(mpf->physptr);
969
970 if (!smp_check_mpc(mpc, oem, str))
971 return 0;
972
973 printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
974 printk(KERN_INFO "physptr: %x\n", mpf->physptr);
975
976 if (mpc_new_phys && mpc->length > mpc_new_length) {
977 mpc_new_phys = 0;
978 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
979 mpc_new_length);
980 }
981
982 if (!mpc_new_phys) {
983 unsigned char old, new;
984 /* check if we can change the postion */
985 mpc->checksum = 0;
986 old = mpf_checksum((unsigned char *)mpc, mpc->length);
987 mpc->checksum = 0xff;
988 new = mpf_checksum((unsigned char *)mpc, mpc->length);
989 if (old == new) {
990 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
991 return 0;
992 }
993 printk(KERN_INFO "use in-positon replacing\n");
994 } else {
995 mpf->physptr = mpc_new_phys;
996 mpc_new = phys_to_virt(mpc_new_phys);
997 memcpy(mpc_new, mpc, mpc->length);
998 mpc = mpc_new;
999 /* check if we can modify that */
1000 if (mpc_new_phys - mpf->physptr) {
1001 struct mpf_intel *mpf_new;
1002 /* steal 16 bytes from [0, 1k) */
1003 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1004 mpf_new = phys_to_virt(0x400 - 16);
1005 memcpy(mpf_new, mpf, 16);
1006 mpf = mpf_new;
1007 mpf->physptr = mpc_new_phys;
1008 }
1009 mpf->checksum = 0;
1010 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
1011 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
1012 }
1013
1014 /*
1015 * only replace the one with mp_INT and
1016 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1017 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1018 * may need pci=routeirq for all coverage
1019 */
1020 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1021
1022 return 0;
1023 }
1024
1025 late_initcall(update_mp_table);
kernel-based virtual machine