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x86, numa: Reduce minimum fake node size to 32M
[linux/fpc-iii.git] / arch / x86 / kernel / mpparse.c
blob9af64d9c4b6770c4fea928f6b2a9533c1f4620e8
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/memblock.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/mc146818rtc.h>
17 #include <linux/bitops.h>
18 #include <linux/acpi.h>
19 #include <linux/module.h>
20 #include <linux/smp.h>
21 #include <linux/pci.h>
22
23 #include <asm/mtrr.h>
24 #include <asm/mpspec.h>
25 #include <asm/pgalloc.h>
26 #include <asm/io_apic.h>
27 #include <asm/proto.h>
28 #include <asm/bios_ebda.h>
29 #include <asm/e820.h>
30 #include <asm/trampoline.h>
31 #include <asm/setup.h>
32 #include <asm/smp.h>
33
34 #include <asm/apic.h>
35 /*
36 * Checksum an MP configuration block.
37 */
38
39 static int __init mpf_checksum(unsigned char *mp, int len)
40 {
41 int sum = 0;
42
43 while (len--)
44 sum += *mp++;
45
46 return sum & 0xFF;
47 }
48
49 int __init default_mpc_apic_id(struct mpc_cpu *m)
50 {
51 return m->apicid;
52 }
53
54 static void __init MP_processor_info(struct mpc_cpu *m)
55 {
56 int apicid;
57 char *bootup_cpu = "";
58
59 if (!(m->cpuflag & CPU_ENABLED)) {
60 disabled_cpus++;
61 return;
62 }
63
64 apicid = x86_init.mpparse.mpc_apic_id(m);
65
66 if (m->cpuflag & CPU_BOOTPROCESSOR) {
67 bootup_cpu = " (Bootup-CPU)";
68 boot_cpu_physical_apicid = m->apicid;
69 }
70
71 printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
72 generic_processor_info(apicid, m->apicver);
73 }
74
75 #ifdef CONFIG_X86_IO_APIC
76 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
77 {
78 memcpy(str, m->bustype, 6);
79 str[6] = 0;
80 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
81 }
82
83 static void __init MP_bus_info(struct mpc_bus *m)
84 {
85 char str[7];
86
87 x86_init.mpparse.mpc_oem_bus_info(m, str);
88
89 #if MAX_MP_BUSSES < 256
90 if (m->busid >= MAX_MP_BUSSES) {
91 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
92 " is too large, max. supported is %d\n",
93 m->busid, str, MAX_MP_BUSSES - 1);
94 return;
95 }
96 #endif
97
98 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
99 set_bit(m->busid, mp_bus_not_pci);
100 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
101 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
102 #endif
103 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
104 if (x86_init.mpparse.mpc_oem_pci_bus)
105 x86_init.mpparse.mpc_oem_pci_bus(m);
106
107 clear_bit(m->busid, mp_bus_not_pci);
108 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
109 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
110 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
111 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
112 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
113 mp_bus_id_to_type[m->busid] = MP_BUS_MCA;
114 #endif
115 } else
116 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
117 }
118
119 static void __init MP_ioapic_info(struct mpc_ioapic *m)
120 {
121 if (!(m->flags & MPC_APIC_USABLE))
122 return;
123
124 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
125 m->apicid, m->apicver, m->apicaddr);
126
127 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top);
128 }
129
130 static void print_MP_intsrc_info(struct mpc_intsrc *m)
131 {
132 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
133 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
134 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
135 m->srcbusirq, m->dstapic, m->dstirq);
136 }
137
138 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
139 {
140 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
141 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
142 mp_irq->irqtype, mp_irq->irqflag & 3,
143 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
144 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
145 }
146
147 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
148 struct mpc_intsrc *mp_irq)
149 {
150 mp_irq->dstapic = m->dstapic;
151 mp_irq->type = m->type;
152 mp_irq->irqtype = m->irqtype;
153 mp_irq->irqflag = m->irqflag;
154 mp_irq->srcbus = m->srcbus;
155 mp_irq->srcbusirq = m->srcbusirq;
156 mp_irq->dstirq = m->dstirq;
157 }
158
159 static void __init assign_to_mpc_intsrc(struct mpc_intsrc *mp_irq,
160 struct mpc_intsrc *m)
161 {
162 m->dstapic = mp_irq->dstapic;
163 m->type = mp_irq->type;
164 m->irqtype = mp_irq->irqtype;
165 m->irqflag = mp_irq->irqflag;
166 m->srcbus = mp_irq->srcbus;
167 m->srcbusirq = mp_irq->srcbusirq;
168 m->dstirq = mp_irq->dstirq;
169 }
170
171 static int __init mp_irq_mpc_intsrc_cmp(struct mpc_intsrc *mp_irq,
172 struct mpc_intsrc *m)
173 {
174 if (mp_irq->dstapic != m->dstapic)
175 return 1;
176 if (mp_irq->type != m->type)
177 return 2;
178 if (mp_irq->irqtype != m->irqtype)
179 return 3;
180 if (mp_irq->irqflag != m->irqflag)
181 return 4;
182 if (mp_irq->srcbus != m->srcbus)
183 return 5;
184 if (mp_irq->srcbusirq != m->srcbusirq)
185 return 6;
186 if (mp_irq->dstirq != m->dstirq)
187 return 7;
188
189 return 0;
190 }
191
192 static void __init MP_intsrc_info(struct mpc_intsrc *m)
193 {
194 int i;
195
196 print_MP_intsrc_info(m);
197
198 for (i = 0; i < mp_irq_entries; i++) {
199 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
200 return;
201 }
202
203 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
204 if (++mp_irq_entries == MAX_IRQ_SOURCES)
205 panic("Max # of irq sources exceeded!!\n");
206 }
207 #else /* CONFIG_X86_IO_APIC */
208 static inline void __init MP_bus_info(struct mpc_bus *m) {}
209 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
210 static inline void __init MP_intsrc_info(struct mpc_intsrc *m) {}
211 #endif /* CONFIG_X86_IO_APIC */
212
213
214 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
215 {
216 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
217 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
218 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
219 m->srcbusirq, m->destapic, m->destapiclint);
220 }
221
222 /*
223 * Read/parse the MPC
224 */
225
226 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
227 {
228
229 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
230 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
231 mpc->signature[0], mpc->signature[1],
232 mpc->signature[2], mpc->signature[3]);
233 return 0;
234 }
235 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
236 printk(KERN_ERR "MPTABLE: checksum error!\n");
237 return 0;
238 }
239 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
240 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
241 mpc->spec);
242 return 0;
243 }
244 if (!mpc->lapic) {
245 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
246 return 0;
247 }
248 memcpy(oem, mpc->oem, 8);
249 oem[8] = 0;
250 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
251
252 memcpy(str, mpc->productid, 12);
253 str[12] = 0;
254
255 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
256
257 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
258
259 return 1;
260 }
261
262 static void skip_entry(unsigned char **ptr, int *count, int size)
263 {
264 *ptr += size;
265 *count += size;
266 }
267
268 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
269 {
270 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
271 "type %x\n", *mpt);
272 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
273 1, mpc, mpc->length, 1);
274 }
275
276 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
277
278 static void __init smp_register_lapic_address(unsigned long address)
279 {
280 mp_lapic_addr = address;
281
282 set_fixmap_nocache(FIX_APIC_BASE, address);
283 if (boot_cpu_physical_apicid == -1U) {
284 boot_cpu_physical_apicid = read_apic_id();
285 apic_version[boot_cpu_physical_apicid] =
286 GET_APIC_VERSION(apic_read(APIC_LVR));
287 }
288 }
289
290 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
291 {
292 char str[16];
293 char oem[10];
294
295 int count = sizeof(*mpc);
296 unsigned char *mpt = ((unsigned char *)mpc) + count;
297
298 if (!smp_check_mpc(mpc, oem, str))
299 return 0;
300
301 #ifdef CONFIG_X86_32
302 generic_mps_oem_check(mpc, oem, str);
303 #endif
304 /* save the local APIC address, it might be non-default */
305 if (!acpi_lapic)
306 mp_lapic_addr = mpc->lapic;
307
308 if (early)
309 return 1;
310
311 /* Initialize the lapic mapping */
312 if (!acpi_lapic)
313 smp_register_lapic_address(mpc->lapic);
314
315 if (mpc->oemptr)
316 x86_init.mpparse.smp_read_mpc_oem(mpc);
317
318 /*
319 * Now process the configuration blocks.
320 */
321 x86_init.mpparse.mpc_record(0);
322
323 while (count < mpc->length) {
324 switch (*mpt) {
325 case MP_PROCESSOR:
326 /* ACPI may have already provided this data */
327 if (!acpi_lapic)
328 MP_processor_info((struct mpc_cpu *)mpt);
329 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
330 break;
331 case MP_BUS:
332 MP_bus_info((struct mpc_bus *)mpt);
333 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
334 break;
335 case MP_IOAPIC:
336 MP_ioapic_info((struct mpc_ioapic *)mpt);
337 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
338 break;
339 case MP_INTSRC:
340 MP_intsrc_info((struct mpc_intsrc *)mpt);
341 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
342 break;
343 case MP_LINTSRC:
344 MP_lintsrc_info((struct mpc_lintsrc *)mpt);
345 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
346 break;
347 default:
348 /* wrong mptable */
349 smp_dump_mptable(mpc, mpt);
350 count = mpc->length;
351 break;
352 }
353 x86_init.mpparse.mpc_record(1);
354 }
355
356 if (!num_processors)
357 printk(KERN_ERR "MPTABLE: no processors registered!\n");
358 return num_processors;
359 }
360
361 #ifdef CONFIG_X86_IO_APIC
362
363 static int __init ELCR_trigger(unsigned int irq)
364 {
365 unsigned int port;
366
367 port = 0x4d0 + (irq >> 3);
368 return (inb(port) >> (irq & 7)) & 1;
369 }
370
371 static void __init construct_default_ioirq_mptable(int mpc_default_type)
372 {
373 struct mpc_intsrc intsrc;
374 int i;
375 int ELCR_fallback = 0;
376
377 intsrc.type = MP_INTSRC;
378 intsrc.irqflag = 0; /* conforming */
379 intsrc.srcbus = 0;
380 intsrc.dstapic = mp_ioapics[0].apicid;
381
382 intsrc.irqtype = mp_INT;
383
384 /*
385 * If true, we have an ISA/PCI system with no IRQ entries
386 * in the MP table. To prevent the PCI interrupts from being set up
387 * incorrectly, we try to use the ELCR. The sanity check to see if
388 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
389 * never be level sensitive, so we simply see if the ELCR agrees.
390 * If it does, we assume it's valid.
391 */
392 if (mpc_default_type == 5) {
393 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
394 "falling back to ELCR\n");
395
396 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
397 ELCR_trigger(13))
398 printk(KERN_ERR "ELCR contains invalid data... "
399 "not using ELCR\n");
400 else {
401 printk(KERN_INFO
402 "Using ELCR to identify PCI interrupts\n");
403 ELCR_fallback = 1;
404 }
405 }
406
407 for (i = 0; i < 16; i++) {
408 switch (mpc_default_type) {
409 case 2:
410 if (i == 0 || i == 13)
411 continue; /* IRQ0 & IRQ13 not connected */
412 /* fall through */
413 default:
414 if (i == 2)
415 continue; /* IRQ2 is never connected */
416 }
417
418 if (ELCR_fallback) {
419 /*
420 * If the ELCR indicates a level-sensitive interrupt, we
421 * copy that information over to the MP table in the
422 * irqflag field (level sensitive, active high polarity).
423 */
424 if (ELCR_trigger(i))
425 intsrc.irqflag = 13;
426 else
427 intsrc.irqflag = 0;
428 }
429
430 intsrc.srcbusirq = i;
431 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
432 MP_intsrc_info(&intsrc);
433 }
434
435 intsrc.irqtype = mp_ExtINT;
436 intsrc.srcbusirq = 0;
437 intsrc.dstirq = 0; /* 8259A to INTIN0 */
438 MP_intsrc_info(&intsrc);
439 }
440
441
442 static void __init construct_ioapic_table(int mpc_default_type)
443 {
444 struct mpc_ioapic ioapic;
445 struct mpc_bus bus;
446
447 bus.type = MP_BUS;
448 bus.busid = 0;
449 switch (mpc_default_type) {
450 default:
451 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
452 mpc_default_type);
453 /* fall through */
454 case 1:
455 case 5:
456 memcpy(bus.bustype, "ISA ", 6);
457 break;
458 case 2:
459 case 6:
460 case 3:
461 memcpy(bus.bustype, "EISA ", 6);
462 break;
463 case 4:
464 case 7:
465 memcpy(bus.bustype, "MCA ", 6);
466 }
467 MP_bus_info(&bus);
468 if (mpc_default_type > 4) {
469 bus.busid = 1;
470 memcpy(bus.bustype, "PCI ", 6);
471 MP_bus_info(&bus);
472 }
473
474 ioapic.type = MP_IOAPIC;
475 ioapic.apicid = 2;
476 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
477 ioapic.flags = MPC_APIC_USABLE;
478 ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
479 MP_ioapic_info(&ioapic);
480
481 /*
482 * We set up most of the low 16 IO-APIC pins according to MPS rules.
483 */
484 construct_default_ioirq_mptable(mpc_default_type);
485 }
486 #else
487 static inline void __init construct_ioapic_table(int mpc_default_type) { }
488 #endif
489
490 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
491 {
492 struct mpc_cpu processor;
493 struct mpc_lintsrc lintsrc;
494 int linttypes[2] = { mp_ExtINT, mp_NMI };
495 int i;
496
497 /*
498 * local APIC has default address
499 */
500 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
501
502 /*
503 * 2 CPUs, numbered 0 & 1.
504 */
505 processor.type = MP_PROCESSOR;
506 /* Either an integrated APIC or a discrete 82489DX. */
507 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
508 processor.cpuflag = CPU_ENABLED;
509 processor.cpufeature = (boot_cpu_data.x86 << 8) |
510 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
511 processor.featureflag = boot_cpu_data.x86_capability[0];
512 processor.reserved[0] = 0;
513 processor.reserved[1] = 0;
514 for (i = 0; i < 2; i++) {
515 processor.apicid = i;
516 MP_processor_info(&processor);
517 }
518
519 construct_ioapic_table(mpc_default_type);
520
521 lintsrc.type = MP_LINTSRC;
522 lintsrc.irqflag = 0; /* conforming */
523 lintsrc.srcbusid = 0;
524 lintsrc.srcbusirq = 0;
525 lintsrc.destapic = MP_APIC_ALL;
526 for (i = 0; i < 2; i++) {
527 lintsrc.irqtype = linttypes[i];
528 lintsrc.destapiclint = i;
529 MP_lintsrc_info(&lintsrc);
530 }
531 }
532
533 static struct mpf_intel *mpf_found;
534
535 static unsigned long __init get_mpc_size(unsigned long physptr)
536 {
537 struct mpc_table *mpc;
538 unsigned long size;
539
540 mpc = early_ioremap(physptr, PAGE_SIZE);
541 size = mpc->length;
542 early_iounmap(mpc, PAGE_SIZE);
543 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
544
545 return size;
546 }
547
548 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
549 {
550 struct mpc_table *mpc;
551 unsigned long size;
552
553 size = get_mpc_size(mpf->physptr);
554 mpc = early_ioremap(mpf->physptr, size);
555 /*
556 * Read the physical hardware table. Anything here will
557 * override the defaults.
558 */
559 if (!smp_read_mpc(mpc, early)) {
560 #ifdef CONFIG_X86_LOCAL_APIC
561 smp_found_config = 0;
562 #endif
563 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
564 "... disabling SMP support. (tell your hw vendor)\n");
565 early_iounmap(mpc, size);
566 return -1;
567 }
568 early_iounmap(mpc, size);
569
570 if (early)
571 return -1;
572
573 #ifdef CONFIG_X86_IO_APIC
574 /*
575 * If there are no explicit MP IRQ entries, then we are
576 * broken. We set up most of the low 16 IO-APIC pins to
577 * ISA defaults and hope it will work.
578 */
579 if (!mp_irq_entries) {
580 struct mpc_bus bus;
581
582 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
583 "using default mptable. (tell your hw vendor)\n");
584
585 bus.type = MP_BUS;
586 bus.busid = 0;
587 memcpy(bus.bustype, "ISA ", 6);
588 MP_bus_info(&bus);
589
590 construct_default_ioirq_mptable(0);
591 }
592 #endif
593
594 return 0;
595 }
596
597 /*
598 * Scan the memory blocks for an SMP configuration block.
599 */
600 void __init default_get_smp_config(unsigned int early)
601 {
602 struct mpf_intel *mpf = mpf_found;
603
604 if (!mpf)
605 return;
606
607 if (acpi_lapic && early)
608 return;
609
610 /*
611 * MPS doesn't support hyperthreading, aka only have
612 * thread 0 apic id in MPS table
613 */
614 if (acpi_lapic && acpi_ioapic)
615 return;
616
617 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
618 mpf->specification);
619 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
620 if (mpf->feature2 & (1 << 7)) {
621 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
622 pic_mode = 1;
623 } else {
624 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
625 pic_mode = 0;
626 }
627 #endif
628 /*
629 * Now see if we need to read further.
630 */
631 if (mpf->feature1 != 0) {
632 if (early) {
633 /*
634 * local APIC has default address
635 */
636 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
637 return;
638 }
639
640 printk(KERN_INFO "Default MP configuration #%d\n",
641 mpf->feature1);
642 construct_default_ISA_mptable(mpf->feature1);
643
644 } else if (mpf->physptr) {
645 if (check_physptr(mpf, early))
646 return;
647 } else
648 BUG();
649
650 if (!early)
651 printk(KERN_INFO "Processors: %d\n", num_processors);
652 /*
653 * Only use the first configuration found.
654 */
655 }
656
657 static void __init smp_reserve_memory(struct mpf_intel *mpf)
658 {
659 unsigned long size = get_mpc_size(mpf->physptr);
660
661 memblock_x86_reserve_range(mpf->physptr, mpf->physptr+size, "* MP-table mpc");
662 }
663
664 static int __init smp_scan_config(unsigned long base, unsigned long length)
665 {
666 unsigned int *bp = phys_to_virt(base);
667 struct mpf_intel *mpf;
668 unsigned long mem;
669
670 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
671 bp, length);
672 BUILD_BUG_ON(sizeof(*mpf) != 16);
673
674 while (length > 0) {
675 mpf = (struct mpf_intel *)bp;
676 if ((*bp == SMP_MAGIC_IDENT) &&
677 (mpf->length == 1) &&
678 !mpf_checksum((unsigned char *)bp, 16) &&
679 ((mpf->specification == 1)
680 || (mpf->specification == 4))) {
681 #ifdef CONFIG_X86_LOCAL_APIC
682 smp_found_config = 1;
683 #endif
684 mpf_found = mpf;
685
686 printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
687 mpf, (u64)virt_to_phys(mpf));
688
689 mem = virt_to_phys(mpf);
690 memblock_x86_reserve_range(mem, mem + sizeof(*mpf), "* MP-table mpf");
691 if (mpf->physptr)
692 smp_reserve_memory(mpf);
693
694 return 1;
695 }
696 bp += 4;
697 length -= 16;
698 }
699 return 0;
700 }
701
702 void __init default_find_smp_config(void)
703 {
704 unsigned int address;
705
706 /*
707 * FIXME: Linux assumes you have 640K of base ram..
708 * this continues the error...
709 *
710 * 1) Scan the bottom 1K for a signature
711 * 2) Scan the top 1K of base RAM
712 * 3) Scan the 64K of bios
713 */
714 if (smp_scan_config(0x0, 0x400) ||
715 smp_scan_config(639 * 0x400, 0x400) ||
716 smp_scan_config(0xF0000, 0x10000))
717 return;
718 /*
719 * If it is an SMP machine we should know now, unless the
720 * configuration is in an EISA/MCA bus machine with an
721 * extended bios data area.
722 *
723 * there is a real-mode segmented pointer pointing to the
724 * 4K EBDA area at 0x40E, calculate and scan it here.
725 *
726 * NOTE! There are Linux loaders that will corrupt the EBDA
727 * area, and as such this kind of SMP config may be less
728 * trustworthy, simply because the SMP table may have been
729 * stomped on during early boot. These loaders are buggy and
730 * should be fixed.
731 *
732 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
733 */
734
735 address = get_bios_ebda();
736 if (address)
737 smp_scan_config(address, 0x400);
738 }
739
740 #ifdef CONFIG_X86_IO_APIC
741 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
742
743 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
744 {
745 int i;
746
747 if (m->irqtype != mp_INT)
748 return 0;
749
750 if (m->irqflag != 0x0f)
751 return 0;
752
753 /* not legacy */
754
755 for (i = 0; i < mp_irq_entries; i++) {
756 if (mp_irqs[i].irqtype != mp_INT)
757 continue;
758
759 if (mp_irqs[i].irqflag != 0x0f)
760 continue;
761
762 if (mp_irqs[i].srcbus != m->srcbus)
763 continue;
764 if (mp_irqs[i].srcbusirq != m->srcbusirq)
765 continue;
766 if (irq_used[i]) {
767 /* already claimed */
768 return -2;
769 }
770 irq_used[i] = 1;
771 return i;
772 }
773
774 /* not found */
775 return -1;
776 }
777
778 #define SPARE_SLOT_NUM 20
779
780 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
781
782 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
783 {
784 int i;
785
786 apic_printk(APIC_VERBOSE, "OLD ");
787 print_MP_intsrc_info(m);
788
789 i = get_MP_intsrc_index(m);
790 if (i > 0) {
791 assign_to_mpc_intsrc(&mp_irqs[i], m);
792 apic_printk(APIC_VERBOSE, "NEW ");
793 print_mp_irq_info(&mp_irqs[i]);
794 return;
795 }
796 if (!i) {
797 /* legacy, do nothing */
798 return;
799 }
800 if (*nr_m_spare < SPARE_SLOT_NUM) {
801 /*
802 * not found (-1), or duplicated (-2) are invalid entries,
803 * we need to use the slot later
804 */
805 m_spare[*nr_m_spare] = m;
806 *nr_m_spare += 1;
807 }
808 }
809 #else /* CONFIG_X86_IO_APIC */
810 static
811 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
812 #endif /* CONFIG_X86_IO_APIC */
813
814 static int
815 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
816 {
817 int ret = 0;
818
819 if (!mpc_new_phys || count <= mpc_new_length) {
820 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
821 return -1;
822 }
823
824 return ret;
825 }
826
827 static int __init replace_intsrc_all(struct mpc_table *mpc,
828 unsigned long mpc_new_phys,
829 unsigned long mpc_new_length)
830 {
831 #ifdef CONFIG_X86_IO_APIC
832 int i;
833 #endif
834 int count = sizeof(*mpc);
835 int nr_m_spare = 0;
836 unsigned char *mpt = ((unsigned char *)mpc) + count;
837
838 printk(KERN_INFO "mpc_length %x\n", mpc->length);
839 while (count < mpc->length) {
840 switch (*mpt) {
841 case MP_PROCESSOR:
842 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
843 break;
844 case MP_BUS:
845 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
846 break;
847 case MP_IOAPIC:
848 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
849 break;
850 case MP_INTSRC:
851 check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
852 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
853 break;
854 case MP_LINTSRC:
855 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
856 break;
857 default:
858 /* wrong mptable */
859 smp_dump_mptable(mpc, mpt);
860 goto out;
861 }
862 }
863
864 #ifdef CONFIG_X86_IO_APIC
865 for (i = 0; i < mp_irq_entries; i++) {
866 if (irq_used[i])
867 continue;
868
869 if (mp_irqs[i].irqtype != mp_INT)
870 continue;
871
872 if (mp_irqs[i].irqflag != 0x0f)
873 continue;
874
875 if (nr_m_spare > 0) {
876 apic_printk(APIC_VERBOSE, "*NEW* found\n");
877 nr_m_spare--;
878 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
879 m_spare[nr_m_spare] = NULL;
880 } else {
881 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
882 count += sizeof(struct mpc_intsrc);
883 if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
884 goto out;
885 assign_to_mpc_intsrc(&mp_irqs[i], m);
886 mpc->length = count;
887 mpt += sizeof(struct mpc_intsrc);
888 }
889 print_mp_irq_info(&mp_irqs[i]);
890 }
891 #endif
892 out:
893 /* update checksum */
894 mpc->checksum = 0;
895 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
896
897 return 0;
898 }
899
900 int enable_update_mptable;
901
902 static int __init update_mptable_setup(char *str)
903 {
904 enable_update_mptable = 1;
905 #ifdef CONFIG_PCI
906 pci_routeirq = 1;
907 #endif
908 return 0;
909 }
910 early_param("update_mptable", update_mptable_setup);
911
912 static unsigned long __initdata mpc_new_phys;
913 static unsigned long mpc_new_length __initdata = 4096;
914
915 /* alloc_mptable or alloc_mptable=4k */
916 static int __initdata alloc_mptable;
917 static int __init parse_alloc_mptable_opt(char *p)
918 {
919 enable_update_mptable = 1;
920 #ifdef CONFIG_PCI
921 pci_routeirq = 1;
922 #endif
923 alloc_mptable = 1;
924 if (!p)
925 return 0;
926 mpc_new_length = memparse(p, &p);
927 return 0;
928 }
929 early_param("alloc_mptable", parse_alloc_mptable_opt);
930
931 void __init early_reserve_e820_mpc_new(void)
932 {
933 if (enable_update_mptable && alloc_mptable) {
934 u64 startt = 0;
935 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
936 }
937 }
938
939 static int __init update_mp_table(void)
940 {
941 char str[16];
942 char oem[10];
943 struct mpf_intel *mpf;
944 struct mpc_table *mpc, *mpc_new;
945
946 if (!enable_update_mptable)
947 return 0;
948
949 mpf = mpf_found;
950 if (!mpf)
951 return 0;
952
953 /*
954 * Now see if we need to go further.
955 */
956 if (mpf->feature1 != 0)
957 return 0;
958
959 if (!mpf->physptr)
960 return 0;
961
962 mpc = phys_to_virt(mpf->physptr);
963
964 if (!smp_check_mpc(mpc, oem, str))
965 return 0;
966
967 printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
968 printk(KERN_INFO "physptr: %x\n", mpf->physptr);
969
970 if (mpc_new_phys && mpc->length > mpc_new_length) {
971 mpc_new_phys = 0;
972 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
973 mpc_new_length);
974 }
975
976 if (!mpc_new_phys) {
977 unsigned char old, new;
978 /* check if we can change the postion */
979 mpc->checksum = 0;
980 old = mpf_checksum((unsigned char *)mpc, mpc->length);
981 mpc->checksum = 0xff;
982 new = mpf_checksum((unsigned char *)mpc, mpc->length);
983 if (old == new) {
984 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
985 return 0;
986 }
987 printk(KERN_INFO "use in-positon replacing\n");
988 } else {
989 mpf->physptr = mpc_new_phys;
990 mpc_new = phys_to_virt(mpc_new_phys);
991 memcpy(mpc_new, mpc, mpc->length);
992 mpc = mpc_new;
993 /* check if we can modify that */
994 if (mpc_new_phys - mpf->physptr) {
995 struct mpf_intel *mpf_new;
996 /* steal 16 bytes from [0, 1k) */
997 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
998 mpf_new = phys_to_virt(0x400 - 16);
999 memcpy(mpf_new, mpf, 16);
1000 mpf = mpf_new;
1001 mpf->physptr = mpc_new_phys;
1002 }
1003 mpf->checksum = 0;
1004 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
1005 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
1006 }
1007
1008 /*
1009 * only replace the one with mp_INT and
1010 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1011 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1012 * may need pci=routeirq for all coverage
1013 */
1014 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1015
1016 return 0;
1017 }
1018
1019 late_initcall(update_mp_table);
Linux with added FPC-III support