?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
iommu/amd: Don't use MSI address range for DMA addresses
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / x86 / kernel / mpparse.c
blobd7b6f7fb4fecfd44205d63ab6cfebfb400e8b21a
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 void __init MP_ioapic_info(struct mpc_ioapic *m)
119 {
120 if (!(m->flags & MPC_APIC_USABLE))
121 return;
122
123 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
124 m->apicid, m->apicver, m->apicaddr);
125
126 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top);
127 }
128
129 static void print_MP_intsrc_info(struct mpc_intsrc *m)
130 {
131 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
132 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
133 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
134 m->srcbusirq, m->dstapic, m->dstirq);
135 }
136
137 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
138 {
139 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
140 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
141 mp_irq->irqtype, mp_irq->irqflag & 3,
142 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
143 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
144 }
145
146 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
147 struct mpc_intsrc *mp_irq)
148 {
149 mp_irq->dstapic = m->dstapic;
150 mp_irq->type = m->type;
151 mp_irq->irqtype = m->irqtype;
152 mp_irq->irqflag = m->irqflag;
153 mp_irq->srcbus = m->srcbus;
154 mp_irq->srcbusirq = m->srcbusirq;
155 mp_irq->dstirq = m->dstirq;
156 }
157
158 static void __init assign_to_mpc_intsrc(struct mpc_intsrc *mp_irq,
159 struct mpc_intsrc *m)
160 {
161 m->dstapic = mp_irq->dstapic;
162 m->type = mp_irq->type;
163 m->irqtype = mp_irq->irqtype;
164 m->irqflag = mp_irq->irqflag;
165 m->srcbus = mp_irq->srcbus;
166 m->srcbusirq = mp_irq->srcbusirq;
167 m->dstirq = mp_irq->dstirq;
168 }
169
170 static int __init mp_irq_mpc_intsrc_cmp(struct mpc_intsrc *mp_irq,
171 struct mpc_intsrc *m)
172 {
173 if (mp_irq->dstapic != m->dstapic)
174 return 1;
175 if (mp_irq->type != m->type)
176 return 2;
177 if (mp_irq->irqtype != m->irqtype)
178 return 3;
179 if (mp_irq->irqflag != m->irqflag)
180 return 4;
181 if (mp_irq->srcbus != m->srcbus)
182 return 5;
183 if (mp_irq->srcbusirq != m->srcbusirq)
184 return 6;
185 if (mp_irq->dstirq != m->dstirq)
186 return 7;
187
188 return 0;
189 }
190
191 static void __init MP_intsrc_info(struct mpc_intsrc *m)
192 {
193 int i;
194
195 print_MP_intsrc_info(m);
196
197 for (i = 0; i < mp_irq_entries; i++) {
198 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
199 return;
200 }
201
202 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
203 if (++mp_irq_entries == MAX_IRQ_SOURCES)
204 panic("Max # of irq sources exceeded!!\n");
205 }
206 #else /* CONFIG_X86_IO_APIC */
207 static inline void __init MP_bus_info(struct mpc_bus *m) {}
208 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
209 static inline void __init MP_intsrc_info(struct mpc_intsrc *m) {}
210 #endif /* CONFIG_X86_IO_APIC */
211
212
213 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
214 {
215 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
216 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
217 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
218 m->srcbusirq, m->destapic, m->destapiclint);
219 }
220
221 /*
222 * Read/parse the MPC
223 */
224
225 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
226 {
227
228 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
229 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
230 mpc->signature[0], mpc->signature[1],
231 mpc->signature[2], mpc->signature[3]);
232 return 0;
233 }
234 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
235 printk(KERN_ERR "MPTABLE: checksum error!\n");
236 return 0;
237 }
238 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
239 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
240 mpc->spec);
241 return 0;
242 }
243 if (!mpc->lapic) {
244 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
245 return 0;
246 }
247 memcpy(oem, mpc->oem, 8);
248 oem[8] = 0;
249 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
250
251 memcpy(str, mpc->productid, 12);
252 str[12] = 0;
253
254 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
255
256 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
257
258 return 1;
259 }
260
261 static void skip_entry(unsigned char **ptr, int *count, int size)
262 {
263 *ptr += size;
264 *count += size;
265 }
266
267 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
268 {
269 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
270 "type %x\n", *mpt);
271 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
272 1, mpc, mpc->length, 1);
273 }
274
275 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
276
277 static void __init smp_register_lapic_address(unsigned long address)
278 {
279 mp_lapic_addr = address;
280
281 set_fixmap_nocache(FIX_APIC_BASE, address);
282 if (boot_cpu_physical_apicid == -1U) {
283 boot_cpu_physical_apicid = read_apic_id();
284 apic_version[boot_cpu_physical_apicid] =
285 GET_APIC_VERSION(apic_read(APIC_LVR));
286 }
287 }
288
289 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
290 {
291 char str[16];
292 char oem[10];
293
294 int count = sizeof(*mpc);
295 unsigned char *mpt = ((unsigned char *)mpc) + count;
296
297 if (!smp_check_mpc(mpc, oem, str))
298 return 0;
299
300 #ifdef CONFIG_X86_32
301 generic_mps_oem_check(mpc, oem, str);
302 #endif
303 /* save the local APIC address, it might be non-default */
304 if (!acpi_lapic)
305 mp_lapic_addr = mpc->lapic;
306
307 if (early)
308 return 1;
309
310 /* Initialize the lapic mapping */
311 if (!acpi_lapic)
312 smp_register_lapic_address(mpc->lapic);
313
314 if (mpc->oemptr)
315 x86_init.mpparse.smp_read_mpc_oem(mpc);
316
317 /*
318 * Now process the configuration blocks.
319 */
320 x86_init.mpparse.mpc_record(0);
321
322 while (count < mpc->length) {
323 switch (*mpt) {
324 case MP_PROCESSOR:
325 /* ACPI may have already provided this data */
326 if (!acpi_lapic)
327 MP_processor_info((struct mpc_cpu *)mpt);
328 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
329 break;
330 case MP_BUS:
331 MP_bus_info((struct mpc_bus *)mpt);
332 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
333 break;
334 case MP_IOAPIC:
335 MP_ioapic_info((struct mpc_ioapic *)mpt);
336 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
337 break;
338 case MP_INTSRC:
339 MP_intsrc_info((struct mpc_intsrc *)mpt);
340 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
341 break;
342 case MP_LINTSRC:
343 MP_lintsrc_info((struct mpc_lintsrc *)mpt);
344 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
345 break;
346 default:
347 /* wrong mptable */
348 smp_dump_mptable(mpc, mpt);
349 count = mpc->length;
350 break;
351 }
352 x86_init.mpparse.mpc_record(1);
353 }
354
355 if (!num_processors)
356 printk(KERN_ERR "MPTABLE: no processors registered!\n");
357 return num_processors;
358 }
359
360 #ifdef CONFIG_X86_IO_APIC
361
362 static int __init ELCR_trigger(unsigned int irq)
363 {
364 unsigned int port;
365
366 port = 0x4d0 + (irq >> 3);
367 return (inb(port) >> (irq & 7)) & 1;
368 }
369
370 static void __init construct_default_ioirq_mptable(int mpc_default_type)
371 {
372 struct mpc_intsrc intsrc;
373 int i;
374 int ELCR_fallback = 0;
375
376 intsrc.type = MP_INTSRC;
377 intsrc.irqflag = 0; /* conforming */
378 intsrc.srcbus = 0;
379 intsrc.dstapic = mp_ioapics[0].apicid;
380
381 intsrc.irqtype = mp_INT;
382
383 /*
384 * If true, we have an ISA/PCI system with no IRQ entries
385 * in the MP table. To prevent the PCI interrupts from being set up
386 * incorrectly, we try to use the ELCR. The sanity check to see if
387 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
388 * never be level sensitive, so we simply see if the ELCR agrees.
389 * If it does, we assume it's valid.
390 */
391 if (mpc_default_type == 5) {
392 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
393 "falling back to ELCR\n");
394
395 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
396 ELCR_trigger(13))
397 printk(KERN_ERR "ELCR contains invalid data... "
398 "not using ELCR\n");
399 else {
400 printk(KERN_INFO
401 "Using ELCR to identify PCI interrupts\n");
402 ELCR_fallback = 1;
403 }
404 }
405
406 for (i = 0; i < 16; i++) {
407 switch (mpc_default_type) {
408 case 2:
409 if (i == 0 || i == 13)
410 continue; /* IRQ0 & IRQ13 not connected */
411 /* fall through */
412 default:
413 if (i == 2)
414 continue; /* IRQ2 is never connected */
415 }
416
417 if (ELCR_fallback) {
418 /*
419 * If the ELCR indicates a level-sensitive interrupt, we
420 * copy that information over to the MP table in the
421 * irqflag field (level sensitive, active high polarity).
422 */
423 if (ELCR_trigger(i))
424 intsrc.irqflag = 13;
425 else
426 intsrc.irqflag = 0;
427 }
428
429 intsrc.srcbusirq = i;
430 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
431 MP_intsrc_info(&intsrc);
432 }
433
434 intsrc.irqtype = mp_ExtINT;
435 intsrc.srcbusirq = 0;
436 intsrc.dstirq = 0; /* 8259A to INTIN0 */
437 MP_intsrc_info(&intsrc);
438 }
439
440
441 static void __init construct_ioapic_table(int mpc_default_type)
442 {
443 struct mpc_ioapic ioapic;
444 struct mpc_bus bus;
445
446 bus.type = MP_BUS;
447 bus.busid = 0;
448 switch (mpc_default_type) {
449 default:
450 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
451 mpc_default_type);
452 /* fall through */
453 case 1:
454 case 5:
455 memcpy(bus.bustype, "ISA ", 6);
456 break;
457 case 2:
458 case 6:
459 case 3:
460 memcpy(bus.bustype, "EISA ", 6);
461 break;
462 case 4:
463 case 7:
464 memcpy(bus.bustype, "MCA ", 6);
465 }
466 MP_bus_info(&bus);
467 if (mpc_default_type > 4) {
468 bus.busid = 1;
469 memcpy(bus.bustype, "PCI ", 6);
470 MP_bus_info(&bus);
471 }
472
473 ioapic.type = MP_IOAPIC;
474 ioapic.apicid = 2;
475 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
476 ioapic.flags = MPC_APIC_USABLE;
477 ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
478 MP_ioapic_info(&ioapic);
479
480 /*
481 * We set up most of the low 16 IO-APIC pins according to MPS rules.
482 */
483 construct_default_ioirq_mptable(mpc_default_type);
484 }
485 #else
486 static inline void __init construct_ioapic_table(int mpc_default_type) { }
487 #endif
488
489 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
490 {
491 struct mpc_cpu processor;
492 struct mpc_lintsrc lintsrc;
493 int linttypes[2] = { mp_ExtINT, mp_NMI };
494 int i;
495
496 /*
497 * local APIC has default address
498 */
499 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
500
501 /*
502 * 2 CPUs, numbered 0 & 1.
503 */
504 processor.type = MP_PROCESSOR;
505 /* Either an integrated APIC or a discrete 82489DX. */
506 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
507 processor.cpuflag = CPU_ENABLED;
508 processor.cpufeature = (boot_cpu_data.x86 << 8) |
509 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
510 processor.featureflag = boot_cpu_data.x86_capability[0];
511 processor.reserved[0] = 0;
512 processor.reserved[1] = 0;
513 for (i = 0; i < 2; i++) {
514 processor.apicid = i;
515 MP_processor_info(&processor);
516 }
517
518 construct_ioapic_table(mpc_default_type);
519
520 lintsrc.type = MP_LINTSRC;
521 lintsrc.irqflag = 0; /* conforming */
522 lintsrc.srcbusid = 0;
523 lintsrc.srcbusirq = 0;
524 lintsrc.destapic = MP_APIC_ALL;
525 for (i = 0; i < 2; i++) {
526 lintsrc.irqtype = linttypes[i];
527 lintsrc.destapiclint = i;
528 MP_lintsrc_info(&lintsrc);
529 }
530 }
531
532 static struct mpf_intel *mpf_found;
533
534 static unsigned long __init get_mpc_size(unsigned long physptr)
535 {
536 struct mpc_table *mpc;
537 unsigned long size;
538
539 mpc = early_ioremap(physptr, PAGE_SIZE);
540 size = mpc->length;
541 early_iounmap(mpc, PAGE_SIZE);
542 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
543
544 return size;
545 }
546
547 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
548 {
549 struct mpc_table *mpc;
550 unsigned long size;
551
552 size = get_mpc_size(mpf->physptr);
553 mpc = early_ioremap(mpf->physptr, size);
554 /*
555 * Read the physical hardware table. Anything here will
556 * override the defaults.
557 */
558 if (!smp_read_mpc(mpc, early)) {
559 #ifdef CONFIG_X86_LOCAL_APIC
560 smp_found_config = 0;
561 #endif
562 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
563 "... disabling SMP support. (tell your hw vendor)\n");
564 early_iounmap(mpc, size);
565 return -1;
566 }
567 early_iounmap(mpc, size);
568
569 if (early)
570 return -1;
571
572 #ifdef CONFIG_X86_IO_APIC
573 /*
574 * If there are no explicit MP IRQ entries, then we are
575 * broken. We set up most of the low 16 IO-APIC pins to
576 * ISA defaults and hope it will work.
577 */
578 if (!mp_irq_entries) {
579 struct mpc_bus bus;
580
581 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
582 "using default mptable. (tell your hw vendor)\n");
583
584 bus.type = MP_BUS;
585 bus.busid = 0;
586 memcpy(bus.bustype, "ISA ", 6);
587 MP_bus_info(&bus);
588
589 construct_default_ioirq_mptable(0);
590 }
591 #endif
592
593 return 0;
594 }
595
596 /*
597 * Scan the memory blocks for an SMP configuration block.
598 */
599 void __init default_get_smp_config(unsigned int early)
600 {
601 struct mpf_intel *mpf = mpf_found;
602
603 if (!mpf)
604 return;
605
606 if (acpi_lapic && early)
607 return;
608
609 /*
610 * MPS doesn't support hyperthreading, aka only have
611 * thread 0 apic id in MPS table
612 */
613 if (acpi_lapic && acpi_ioapic)
614 return;
615
616 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
617 mpf->specification);
618 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
619 if (mpf->feature2 & (1 << 7)) {
620 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
621 pic_mode = 1;
622 } else {
623 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
624 pic_mode = 0;
625 }
626 #endif
627 /*
628 * Now see if we need to read further.
629 */
630 if (mpf->feature1 != 0) {
631 if (early) {
632 /*
633 * local APIC has default address
634 */
635 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
636 return;
637 }
638
639 printk(KERN_INFO "Default MP configuration #%d\n",
640 mpf->feature1);
641 construct_default_ISA_mptable(mpf->feature1);
642
643 } else if (mpf->physptr) {
644 if (check_physptr(mpf, early))
645 return;
646 } else
647 BUG();
648
649 if (!early)
650 printk(KERN_INFO "Processors: %d\n", num_processors);
651 /*
652 * Only use the first configuration found.
653 */
654 }
655
656 static void __init smp_reserve_memory(struct mpf_intel *mpf)
657 {
658 unsigned long size = get_mpc_size(mpf->physptr);
659
660 reserve_early_overlap_ok(mpf->physptr, mpf->physptr+size, "MP-table mpc");
661 }
662
663 static int __init smp_scan_config(unsigned long base, unsigned long length)
664 {
665 unsigned int *bp = phys_to_virt(base);
666 struct mpf_intel *mpf;
667 unsigned long mem;
668
669 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
670 bp, length);
671 BUILD_BUG_ON(sizeof(*mpf) != 16);
672
673 while (length > 0) {
674 mpf = (struct mpf_intel *)bp;
675 if ((*bp == SMP_MAGIC_IDENT) &&
676 (mpf->length == 1) &&
677 !mpf_checksum((unsigned char *)bp, 16) &&
678 ((mpf->specification == 1)
679 || (mpf->specification == 4))) {
680 #ifdef CONFIG_X86_LOCAL_APIC
681 smp_found_config = 1;
682 #endif
683 mpf_found = mpf;
684
685 printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
686 mpf, (u64)virt_to_phys(mpf));
687
688 mem = virt_to_phys(mpf);
689 reserve_early_overlap_ok(mem, mem + sizeof(*mpf), "MP-table mpf");
690 if (mpf->physptr)
691 smp_reserve_memory(mpf);
692
693 return 1;
694 }
695 bp += 4;
696 length -= 16;
697 }
698 return 0;
699 }
700
701 void __init default_find_smp_config(void)
702 {
703 unsigned int address;
704
705 /*
706 * FIXME: Linux assumes you have 640K of base ram..
707 * this continues the error...
708 *
709 * 1) Scan the bottom 1K for a signature
710 * 2) Scan the top 1K of base RAM
711 * 3) Scan the 64K of bios
712 */
713 if (smp_scan_config(0x0, 0x400) ||
714 smp_scan_config(639 * 0x400, 0x400) ||
715 smp_scan_config(0xF0000, 0x10000))
716 return;
717 /*
718 * If it is an SMP machine we should know now, unless the
719 * configuration is in an EISA/MCA bus machine with an
720 * extended bios data area.
721 *
722 * there is a real-mode segmented pointer pointing to the
723 * 4K EBDA area at 0x40E, calculate and scan it here.
724 *
725 * NOTE! There are Linux loaders that will corrupt the EBDA
726 * area, and as such this kind of SMP config may be less
727 * trustworthy, simply because the SMP table may have been
728 * stomped on during early boot. These loaders are buggy and
729 * should be fixed.
730 *
731 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
732 */
733
734 address = get_bios_ebda();
735 if (address)
736 smp_scan_config(address, 0x400);
737 }
738
739 #ifdef CONFIG_X86_IO_APIC
740 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
741
742 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
743 {
744 int i;
745
746 if (m->irqtype != mp_INT)
747 return 0;
748
749 if (m->irqflag != 0x0f)
750 return 0;
751
752 /* not legacy */
753
754 for (i = 0; i < mp_irq_entries; i++) {
755 if (mp_irqs[i].irqtype != mp_INT)
756 continue;
757
758 if (mp_irqs[i].irqflag != 0x0f)
759 continue;
760
761 if (mp_irqs[i].srcbus != m->srcbus)
762 continue;
763 if (mp_irqs[i].srcbusirq != m->srcbusirq)
764 continue;
765 if (irq_used[i]) {
766 /* already claimed */
767 return -2;
768 }
769 irq_used[i] = 1;
770 return i;
771 }
772
773 /* not found */
774 return -1;
775 }
776
777 #define SPARE_SLOT_NUM 20
778
779 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
780
781 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
782 {
783 int i;
784
785 apic_printk(APIC_VERBOSE, "OLD ");
786 print_MP_intsrc_info(m);
787
788 i = get_MP_intsrc_index(m);
789 if (i > 0) {
790 assign_to_mpc_intsrc(&mp_irqs[i], m);
791 apic_printk(APIC_VERBOSE, "NEW ");
792 print_mp_irq_info(&mp_irqs[i]);
793 return;
794 }
795 if (!i) {
796 /* legacy, do nothing */
797 return;
798 }
799 if (*nr_m_spare < SPARE_SLOT_NUM) {
800 /*
801 * not found (-1), or duplicated (-2) are invalid entries,
802 * we need to use the slot later
803 */
804 m_spare[*nr_m_spare] = m;
805 *nr_m_spare += 1;
806 }
807 }
808 #else /* CONFIG_X86_IO_APIC */
809 static
810 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
811 #endif /* CONFIG_X86_IO_APIC */
812
813 static int
814 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
815 {
816 int ret = 0;
817
818 if (!mpc_new_phys || count <= mpc_new_length) {
819 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
820 return -1;
821 }
822
823 return ret;
824 }
825
826 static int __init replace_intsrc_all(struct mpc_table *mpc,
827 unsigned long mpc_new_phys,
828 unsigned long mpc_new_length)
829 {
830 #ifdef CONFIG_X86_IO_APIC
831 int i;
832 #endif
833 int count = sizeof(*mpc);
834 int nr_m_spare = 0;
835 unsigned char *mpt = ((unsigned char *)mpc) + count;
836
837 printk(KERN_INFO "mpc_length %x\n", mpc->length);
838 while (count < mpc->length) {
839 switch (*mpt) {
840 case MP_PROCESSOR:
841 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
842 break;
843 case MP_BUS:
844 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
845 break;
846 case MP_IOAPIC:
847 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
848 break;
849 case MP_INTSRC:
850 check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
851 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
852 break;
853 case MP_LINTSRC:
854 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
855 break;
856 default:
857 /* wrong mptable */
858 smp_dump_mptable(mpc, mpt);
859 goto out;
860 }
861 }
862
863 #ifdef CONFIG_X86_IO_APIC
864 for (i = 0; i < mp_irq_entries; i++) {
865 if (irq_used[i])
866 continue;
867
868 if (mp_irqs[i].irqtype != mp_INT)
869 continue;
870
871 if (mp_irqs[i].irqflag != 0x0f)
872 continue;
873
874 if (nr_m_spare > 0) {
875 apic_printk(APIC_VERBOSE, "*NEW* found\n");
876 nr_m_spare--;
877 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
878 m_spare[nr_m_spare] = NULL;
879 } else {
880 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
881 count += sizeof(struct mpc_intsrc);
882 if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
883 goto out;
884 assign_to_mpc_intsrc(&mp_irqs[i], m);
885 mpc->length = count;
886 mpt += sizeof(struct mpc_intsrc);
887 }
888 print_mp_irq_info(&mp_irqs[i]);
889 }
890 #endif
891 out:
892 /* update checksum */
893 mpc->checksum = 0;
894 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
895
896 return 0;
897 }
898
899 int enable_update_mptable;
900
901 static int __init update_mptable_setup(char *str)
902 {
903 enable_update_mptable = 1;
904 #ifdef CONFIG_PCI
905 pci_routeirq = 1;
906 #endif
907 return 0;
908 }
909 early_param("update_mptable", update_mptable_setup);
910
911 static unsigned long __initdata mpc_new_phys;
912 static unsigned long mpc_new_length __initdata = 4096;
913
914 /* alloc_mptable or alloc_mptable=4k */
915 static int __initdata alloc_mptable;
916 static int __init parse_alloc_mptable_opt(char *p)
917 {
918 enable_update_mptable = 1;
919 #ifdef CONFIG_PCI
920 pci_routeirq = 1;
921 #endif
922 alloc_mptable = 1;
923 if (!p)
924 return 0;
925 mpc_new_length = memparse(p, &p);
926 return 0;
927 }
928 early_param("alloc_mptable", parse_alloc_mptable_opt);
929
930 void __init early_reserve_e820_mpc_new(void)
931 {
932 if (enable_update_mptable && alloc_mptable) {
933 u64 startt = 0;
934 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
935 }
936 }
937
938 static int __init update_mp_table(void)
939 {
940 char str[16];
941 char oem[10];
942 struct mpf_intel *mpf;
943 struct mpc_table *mpc, *mpc_new;
944
945 if (!enable_update_mptable)
946 return 0;
947
948 mpf = mpf_found;
949 if (!mpf)
950 return 0;
951
952 /*
953 * Now see if we need to go further.
954 */
955 if (mpf->feature1 != 0)
956 return 0;
957
958 if (!mpf->physptr)
959 return 0;
960
961 mpc = phys_to_virt(mpf->physptr);
962
963 if (!smp_check_mpc(mpc, oem, str))
964 return 0;
965
966 printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
967 printk(KERN_INFO "physptr: %x\n", mpf->physptr);
968
969 if (mpc_new_phys && mpc->length > mpc_new_length) {
970 mpc_new_phys = 0;
971 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
972 mpc_new_length);
973 }
974
975 if (!mpc_new_phys) {
976 unsigned char old, new;
977 /* check if we can change the postion */
978 mpc->checksum = 0;
979 old = mpf_checksum((unsigned char *)mpc, mpc->length);
980 mpc->checksum = 0xff;
981 new = mpf_checksum((unsigned char *)mpc, mpc->length);
982 if (old == new) {
983 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
984 return 0;
985 }
986 printk(KERN_INFO "use in-positon replacing\n");
987 } else {
988 mpf->physptr = mpc_new_phys;
989 mpc_new = phys_to_virt(mpc_new_phys);
990 memcpy(mpc_new, mpc, mpc->length);
991 mpc = mpc_new;
992 /* check if we can modify that */
993 if (mpc_new_phys - mpf->physptr) {
994 struct mpf_intel *mpf_new;
995 /* steal 16 bytes from [0, 1k) */
996 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
997 mpf_new = phys_to_virt(0x400 - 16);
998 memcpy(mpf_new, mpf, 16);
999 mpf = mpf_new;
1000 mpf->physptr = mpc_new_phys;
1001 }
1002 mpf->checksum = 0;
1003 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
1004 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
1005 }
1006
1007 /*
1008 * only replace the one with mp_INT and
1009 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1010 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1011 * may need pci=routeirq for all coverage
1012 */
1013 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1014
1015 return 0;
1016 }
1017
1018 late_initcall(update_mp_table);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree