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ftrace: use dynamic patching for updating mcount calls
[deliverable/linux.git] / arch / x86 / kernel / mpparse.c
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@redhat.com>
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
20 #include <asm/smp.h>
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/acpi.h>
27 #include <asm/bios_ebda.h>
28
29 #include <mach_apic.h>
30 #ifdef CONFIG_X86_32
31 #include <mach_apicdef.h>
32 #include <mach_mpparse.h>
33 #endif
34
35 /* Have we found an MP table */
36 int smp_found_config;
37
38 /*
39 * Various Linux-internal data structures created from the
40 * MP-table.
41 */
42 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
43 int mp_bus_id_to_type[MAX_MP_BUSSES];
44 #endif
45
46 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
47 int mp_bus_id_to_pci_bus[MAX_MP_BUSSES] = {[0 ... MAX_MP_BUSSES - 1] = -1 };
48
49 static int mp_current_pci_id;
50
51 int pic_mode;
52
53 /*
54 * Intel MP BIOS table parsing routines:
55 */
56
57 /*
58 * Checksum an MP configuration block.
59 */
60
61 static int __init mpf_checksum(unsigned char *mp, int len)
62 {
63 int sum = 0;
64
65 while (len--)
66 sum += *mp++;
67
68 return sum & 0xFF;
69 }
70
71 #ifdef CONFIG_X86_NUMAQ
72 /*
73 * Have to match translation table entries to main table entries by counter
74 * hence the mpc_record variable .... can't see a less disgusting way of
75 * doing this ....
76 */
77
78 static int mpc_record;
79 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY]
80 __cpuinitdata;
81 #endif
82
83 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
84 {
85 int apicid;
86 char *bootup_cpu = "";
87
88 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
89 disabled_cpus++;
90 return;
91 }
92 #ifdef CONFIG_X86_NUMAQ
93 apicid = mpc_apic_id(m, translation_table[mpc_record]);
94 #else
95 apicid = m->mpc_apicid;
96 #endif
97 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
98 bootup_cpu = " (Bootup-CPU)";
99 boot_cpu_physical_apicid = m->mpc_apicid;
100 }
101
102 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
103 generic_processor_info(apicid, m->mpc_apicver);
104 }
105
106 static void __init MP_bus_info(struct mpc_config_bus *m)
107 {
108 char str[7];
109
110 memcpy(str, m->mpc_bustype, 6);
111 str[6] = 0;
112
113 #ifdef CONFIG_X86_NUMAQ
114 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
115 #else
116 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
117 #endif
118
119 #if MAX_MP_BUSSES < 256
120 if (m->mpc_busid >= MAX_MP_BUSSES) {
121 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
122 " is too large, max. supported is %d\n",
123 m->mpc_busid, str, MAX_MP_BUSSES - 1);
124 return;
125 }
126 #endif
127
128 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
129 set_bit(m->mpc_busid, mp_bus_not_pci);
130 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
131 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
132 #endif
133 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
134 #ifdef CONFIG_X86_NUMAQ
135 mpc_oem_pci_bus(m, translation_table[mpc_record]);
136 #endif
137 clear_bit(m->mpc_busid, mp_bus_not_pci);
138 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
139 mp_current_pci_id++;
140 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
141 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
142 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
143 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
144 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
145 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
146 #endif
147 } else
148 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
149 }
150
151 #ifdef CONFIG_X86_IO_APIC
152
153 static int bad_ioapic(unsigned long address)
154 {
155 if (nr_ioapics >= MAX_IO_APICS) {
156 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
157 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
158 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
159 }
160 if (!address) {
161 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
162 " found in table, skipping!\n");
163 return 1;
164 }
165 return 0;
166 }
167
168 static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
169 {
170 if (!(m->mpc_flags & MPC_APIC_USABLE))
171 return;
172
173 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
174 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
175
176 if (bad_ioapic(m->mpc_apicaddr))
177 return;
178
179 mp_ioapics[nr_ioapics] = *m;
180 nr_ioapics++;
181 }
182
183 static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
184 {
185 mp_irqs[mp_irq_entries] = *m;
186 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
187 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
188 m->mpc_irqtype, m->mpc_irqflag & 3,
189 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
190 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
191 if (++mp_irq_entries == MAX_IRQ_SOURCES)
192 panic("Max # of irq sources exceeded!!\n");
193 }
194
195 #endif
196
197 static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
198 {
199 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
200 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
201 m->mpc_irqtype, m->mpc_irqflag & 3,
202 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
203 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
204 }
205
206 #ifdef CONFIG_X86_NUMAQ
207 static void __init MP_translation_info(struct mpc_config_translation *m)
208 {
209 printk(KERN_INFO
210 "Translation: record %d, type %d, quad %d, global %d, local %d\n",
211 mpc_record, m->trans_type, m->trans_quad, m->trans_global,
212 m->trans_local);
213
214 if (mpc_record >= MAX_MPC_ENTRY)
215 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
216 else
217 translation_table[mpc_record] = m; /* stash this for later */
218 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
219 node_set_online(m->trans_quad);
220 }
221
222 /*
223 * Read/parse the MPC oem tables
224 */
225
226 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
227 unsigned short oemsize)
228 {
229 int count = sizeof(*oemtable); /* the header size */
230 unsigned char *oemptr = ((unsigned char *)oemtable) + count;
231
232 mpc_record = 0;
233 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
234 oemtable);
235 if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
236 printk(KERN_WARNING
237 "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
238 oemtable->oem_signature[0], oemtable->oem_signature[1],
239 oemtable->oem_signature[2], oemtable->oem_signature[3]);
240 return;
241 }
242 if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
243 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
244 return;
245 }
246 while (count < oemtable->oem_length) {
247 switch (*oemptr) {
248 case MP_TRANSLATION:
249 {
250 struct mpc_config_translation *m =
251 (struct mpc_config_translation *)oemptr;
252 MP_translation_info(m);
253 oemptr += sizeof(*m);
254 count += sizeof(*m);
255 ++mpc_record;
256 break;
257 }
258 default:
259 {
260 printk(KERN_WARNING
261 "Unrecognised OEM table entry type! - %d\n",
262 (int)*oemptr);
263 return;
264 }
265 }
266 }
267 }
268
269 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
270 char *productid)
271 {
272 if (strncmp(oem, "IBM NUMA", 8))
273 printk("Warning! May not be a NUMA-Q system!\n");
274 if (mpc->mpc_oemptr)
275 smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
276 mpc->mpc_oemsize);
277 }
278 #endif /* CONFIG_X86_NUMAQ */
279
280 /*
281 * Read/parse the MPC
282 */
283
284 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
285 {
286 char str[16];
287 char oem[10];
288 int count = sizeof(*mpc);
289 unsigned char *mpt = ((unsigned char *)mpc) + count;
290
291 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
292 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
293 mpc->mpc_signature[0], mpc->mpc_signature[1],
294 mpc->mpc_signature[2], mpc->mpc_signature[3]);
295 return 0;
296 }
297 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
298 printk(KERN_ERR "MPTABLE: checksum error!\n");
299 return 0;
300 }
301 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
302 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
303 mpc->mpc_spec);
304 return 0;
305 }
306 if (!mpc->mpc_lapic) {
307 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
308 return 0;
309 }
310 memcpy(oem, mpc->mpc_oem, 8);
311 oem[8] = 0;
312 printk(KERN_INFO "MPTABLE: OEM ID: %s ", oem);
313
314 memcpy(str, mpc->mpc_productid, 12);
315 str[12] = 0;
316 printk("Product ID: %s ", str);
317
318 #ifdef CONFIG_X86_32
319 mps_oem_check(mpc, oem, str);
320 #endif
321 printk(KERN_INFO "MPTABLE: Product ID: %s ", str);
322
323 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
324
325 /* save the local APIC address, it might be non-default */
326 if (!acpi_lapic)
327 mp_lapic_addr = mpc->mpc_lapic;
328
329 if (early)
330 return 1;
331
332 /*
333 * Now process the configuration blocks.
334 */
335 #ifdef CONFIG_X86_NUMAQ
336 mpc_record = 0;
337 #endif
338 while (count < mpc->mpc_length) {
339 switch (*mpt) {
340 case MP_PROCESSOR:
341 {
342 struct mpc_config_processor *m =
343 (struct mpc_config_processor *)mpt;
344 /* ACPI may have already provided this data */
345 if (!acpi_lapic)
346 MP_processor_info(m);
347 mpt += sizeof(*m);
348 count += sizeof(*m);
349 break;
350 }
351 case MP_BUS:
352 {
353 struct mpc_config_bus *m =
354 (struct mpc_config_bus *)mpt;
355 MP_bus_info(m);
356 mpt += sizeof(*m);
357 count += sizeof(*m);
358 break;
359 }
360 case MP_IOAPIC:
361 {
362 #ifdef CONFIG_X86_IO_APIC
363 struct mpc_config_ioapic *m =
364 (struct mpc_config_ioapic *)mpt;
365 MP_ioapic_info(m);
366 #endif
367 mpt += sizeof(struct mpc_config_ioapic);
368 count += sizeof(struct mpc_config_ioapic);
369 break;
370 }
371 case MP_INTSRC:
372 {
373 #ifdef CONFIG_X86_IO_APIC
374 struct mpc_config_intsrc *m =
375 (struct mpc_config_intsrc *)mpt;
376
377 MP_intsrc_info(m);
378 #endif
379 mpt += sizeof(struct mpc_config_intsrc);
380 count += sizeof(struct mpc_config_intsrc);
381 break;
382 }
383 case MP_LINTSRC:
384 {
385 struct mpc_config_lintsrc *m =
386 (struct mpc_config_lintsrc *)mpt;
387 MP_lintsrc_info(m);
388 mpt += sizeof(*m);
389 count += sizeof(*m);
390 break;
391 }
392 default:
393 /* wrong mptable */
394 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
395 printk(KERN_ERR "type %x\n", *mpt);
396 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
397 1, mpc, mpc->mpc_length, 1);
398 count = mpc->mpc_length;
399 break;
400 }
401 #ifdef CONFIG_X86_NUMAQ
402 ++mpc_record;
403 #endif
404 }
405 setup_apic_routing();
406 if (!num_processors)
407 printk(KERN_ERR "MPTABLE: no processors registered!\n");
408 return num_processors;
409 }
410
411 #ifdef CONFIG_X86_IO_APIC
412
413 static int __init ELCR_trigger(unsigned int irq)
414 {
415 unsigned int port;
416
417 port = 0x4d0 + (irq >> 3);
418 return (inb(port) >> (irq & 7)) & 1;
419 }
420
421 static void __init construct_default_ioirq_mptable(int mpc_default_type)
422 {
423 struct mpc_config_intsrc intsrc;
424 int i;
425 int ELCR_fallback = 0;
426
427 intsrc.mpc_type = MP_INTSRC;
428 intsrc.mpc_irqflag = 0; /* conforming */
429 intsrc.mpc_srcbus = 0;
430 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
431
432 intsrc.mpc_irqtype = mp_INT;
433
434 /*
435 * If true, we have an ISA/PCI system with no IRQ entries
436 * in the MP table. To prevent the PCI interrupts from being set up
437 * incorrectly, we try to use the ELCR. The sanity check to see if
438 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
439 * never be level sensitive, so we simply see if the ELCR agrees.
440 * If it does, we assume it's valid.
441 */
442 if (mpc_default_type == 5) {
443 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
444 "falling back to ELCR\n");
445
446 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
447 ELCR_trigger(13))
448 printk(KERN_ERR "ELCR contains invalid data... "
449 "not using ELCR\n");
450 else {
451 printk(KERN_INFO
452 "Using ELCR to identify PCI interrupts\n");
453 ELCR_fallback = 1;
454 }
455 }
456
457 for (i = 0; i < 16; i++) {
458 switch (mpc_default_type) {
459 case 2:
460 if (i == 0 || i == 13)
461 continue; /* IRQ0 & IRQ13 not connected */
462 /* fall through */
463 default:
464 if (i == 2)
465 continue; /* IRQ2 is never connected */
466 }
467
468 if (ELCR_fallback) {
469 /*
470 * If the ELCR indicates a level-sensitive interrupt, we
471 * copy that information over to the MP table in the
472 * irqflag field (level sensitive, active high polarity).
473 */
474 if (ELCR_trigger(i))
475 intsrc.mpc_irqflag = 13;
476 else
477 intsrc.mpc_irqflag = 0;
478 }
479
480 intsrc.mpc_srcbusirq = i;
481 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
482 MP_intsrc_info(&intsrc);
483 }
484
485 intsrc.mpc_irqtype = mp_ExtINT;
486 intsrc.mpc_srcbusirq = 0;
487 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
488 MP_intsrc_info(&intsrc);
489 }
490
491 #endif
492
493 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
494 {
495 struct mpc_config_processor processor;
496 struct mpc_config_bus bus;
497 #ifdef CONFIG_X86_IO_APIC
498 struct mpc_config_ioapic ioapic;
499 #endif
500 struct mpc_config_lintsrc lintsrc;
501 int linttypes[2] = { mp_ExtINT, mp_NMI };
502 int i;
503
504 /*
505 * local APIC has default address
506 */
507 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
508
509 /*
510 * 2 CPUs, numbered 0 & 1.
511 */
512 processor.mpc_type = MP_PROCESSOR;
513 /* Either an integrated APIC or a discrete 82489DX. */
514 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
515 processor.mpc_cpuflag = CPU_ENABLED;
516 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
517 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
518 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
519 processor.mpc_reserved[0] = 0;
520 processor.mpc_reserved[1] = 0;
521 for (i = 0; i < 2; i++) {
522 processor.mpc_apicid = i;
523 MP_processor_info(&processor);
524 }
525
526 bus.mpc_type = MP_BUS;
527 bus.mpc_busid = 0;
528 switch (mpc_default_type) {
529 default:
530 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
531 mpc_default_type);
532 /* fall through */
533 case 1:
534 case 5:
535 memcpy(bus.mpc_bustype, "ISA ", 6);
536 break;
537 case 2:
538 case 6:
539 case 3:
540 memcpy(bus.mpc_bustype, "EISA ", 6);
541 break;
542 case 4:
543 case 7:
544 memcpy(bus.mpc_bustype, "MCA ", 6);
545 }
546 MP_bus_info(&bus);
547 if (mpc_default_type > 4) {
548 bus.mpc_busid = 1;
549 memcpy(bus.mpc_bustype, "PCI ", 6);
550 MP_bus_info(&bus);
551 }
552
553 #ifdef CONFIG_X86_IO_APIC
554 ioapic.mpc_type = MP_IOAPIC;
555 ioapic.mpc_apicid = 2;
556 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
557 ioapic.mpc_flags = MPC_APIC_USABLE;
558 ioapic.mpc_apicaddr = 0xFEC00000;
559 MP_ioapic_info(&ioapic);
560
561 /*
562 * We set up most of the low 16 IO-APIC pins according to MPS rules.
563 */
564 construct_default_ioirq_mptable(mpc_default_type);
565 #endif
566 lintsrc.mpc_type = MP_LINTSRC;
567 lintsrc.mpc_irqflag = 0; /* conforming */
568 lintsrc.mpc_srcbusid = 0;
569 lintsrc.mpc_srcbusirq = 0;
570 lintsrc.mpc_destapic = MP_APIC_ALL;
571 for (i = 0; i < 2; i++) {
572 lintsrc.mpc_irqtype = linttypes[i];
573 lintsrc.mpc_destapiclint = i;
574 MP_lintsrc_info(&lintsrc);
575 }
576 }
577
578 static struct intel_mp_floating *mpf_found;
579
580 /*
581 * Scan the memory blocks for an SMP configuration block.
582 */
583 static void __init __get_smp_config(unsigned early)
584 {
585 struct intel_mp_floating *mpf = mpf_found;
586
587 if (acpi_lapic && early)
588 return;
589 /*
590 * ACPI supports both logical (e.g. Hyper-Threading) and physical
591 * processors, where MPS only supports physical.
592 */
593 if (acpi_lapic && acpi_ioapic) {
594 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
595 "information\n");
596 return;
597 } else if (acpi_lapic)
598 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
599 "configuration information\n");
600
601 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
602 mpf->mpf_specification);
603 #ifdef CONFIG_X86_32
604 if (mpf->mpf_feature2 & (1 << 7)) {
605 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
606 pic_mode = 1;
607 } else {
608 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
609 pic_mode = 0;
610 }
611 #endif
612 /*
613 * Now see if we need to read further.
614 */
615 if (mpf->mpf_feature1 != 0) {
616 if (early) {
617 /*
618 * local APIC has default address
619 */
620 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
621 return;
622 }
623
624 printk(KERN_INFO "Default MP configuration #%d\n",
625 mpf->mpf_feature1);
626 construct_default_ISA_mptable(mpf->mpf_feature1);
627
628 } else if (mpf->mpf_physptr) {
629
630 /*
631 * Read the physical hardware table. Anything here will
632 * override the defaults.
633 */
634 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
635 smp_found_config = 0;
636 printk(KERN_ERR
637 "BIOS bug, MP table errors detected!...\n");
638 printk(KERN_ERR "... disabling SMP support. "
639 "(tell your hw vendor)\n");
640 return;
641 }
642
643 if (early)
644 return;
645 #ifdef CONFIG_X86_IO_APIC
646 /*
647 * If there are no explicit MP IRQ entries, then we are
648 * broken. We set up most of the low 16 IO-APIC pins to
649 * ISA defaults and hope it will work.
650 */
651 if (!mp_irq_entries) {
652 struct mpc_config_bus bus;
653
654 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
655 "using default mptable. "
656 "(tell your hw vendor)\n");
657
658 bus.mpc_type = MP_BUS;
659 bus.mpc_busid = 0;
660 memcpy(bus.mpc_bustype, "ISA ", 6);
661 MP_bus_info(&bus);
662
663 construct_default_ioirq_mptable(0);
664 }
665 #endif
666 } else
667 BUG();
668
669 if (!early)
670 printk(KERN_INFO "Processors: %d\n", num_processors);
671 /*
672 * Only use the first configuration found.
673 */
674 }
675
676 void __init early_get_smp_config(void)
677 {
678 __get_smp_config(1);
679 }
680
681 void __init get_smp_config(void)
682 {
683 __get_smp_config(0);
684 }
685
686 static int __init smp_scan_config(unsigned long base, unsigned long length,
687 unsigned reserve)
688 {
689 unsigned int *bp = phys_to_virt(base);
690 struct intel_mp_floating *mpf;
691
692 Dprintk("Scan SMP from %p for %ld bytes.\n", bp, length);
693 BUILD_BUG_ON(sizeof(*mpf) != 16);
694
695 while (length > 0) {
696 mpf = (struct intel_mp_floating *)bp;
697 if ((*bp == SMP_MAGIC_IDENT) &&
698 (mpf->mpf_length == 1) &&
699 !mpf_checksum((unsigned char *)bp, 16) &&
700 ((mpf->mpf_specification == 1)
701 || (mpf->mpf_specification == 4))) {
702
703 smp_found_config = 1;
704 mpf_found = mpf;
705 #ifdef CONFIG_X86_32
706 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
707 mpf, virt_to_phys(mpf));
708 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
709 BOOTMEM_DEFAULT);
710 if (mpf->mpf_physptr) {
711 /*
712 * We cannot access to MPC table to compute
713 * table size yet, as only few megabytes from
714 * the bottom is mapped now.
715 * PC-9800's MPC table places on the very last
716 * of physical memory; so that simply reserving
717 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
718 * in reserve_bootmem.
719 */
720 unsigned long size = PAGE_SIZE;
721 unsigned long end = max_low_pfn * PAGE_SIZE;
722 if (mpf->mpf_physptr + size > end)
723 size = end - mpf->mpf_physptr;
724 reserve_bootmem(mpf->mpf_physptr, size,
725 BOOTMEM_DEFAULT);
726 }
727
728 #else
729 if (!reserve)
730 return 1;
731
732 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
733 if (mpf->mpf_physptr)
734 reserve_bootmem_generic(mpf->mpf_physptr,
735 PAGE_SIZE);
736 #endif
737 return 1;
738 }
739 bp += 4;
740 length -= 16;
741 }
742 return 0;
743 }
744
745 static void __init __find_smp_config(unsigned reserve)
746 {
747 unsigned int address;
748
749 /*
750 * FIXME: Linux assumes you have 640K of base ram..
751 * this continues the error...
752 *
753 * 1) Scan the bottom 1K for a signature
754 * 2) Scan the top 1K of base RAM
755 * 3) Scan the 64K of bios
756 */
757 if (smp_scan_config(0x0, 0x400, reserve) ||
758 smp_scan_config(639 * 0x400, 0x400, reserve) ||
759 smp_scan_config(0xF0000, 0x10000, reserve))
760 return;
761 /*
762 * If it is an SMP machine we should know now, unless the
763 * configuration is in an EISA/MCA bus machine with an
764 * extended bios data area.
765 *
766 * there is a real-mode segmented pointer pointing to the
767 * 4K EBDA area at 0x40E, calculate and scan it here.
768 *
769 * NOTE! There are Linux loaders that will corrupt the EBDA
770 * area, and as such this kind of SMP config may be less
771 * trustworthy, simply because the SMP table may have been
772 * stomped on during early boot. These loaders are buggy and
773 * should be fixed.
774 *
775 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
776 */
777
778 address = get_bios_ebda();
779 if (address)
780 smp_scan_config(address, 0x400, reserve);
781 }
782
783 void __init early_find_smp_config(void)
784 {
785 __find_smp_config(0);
786 }
787
788 void __init find_smp_config(void)
789 {
790 __find_smp_config(1);
791 }
792
793 /* --------------------------------------------------------------------------
794 ACPI-based MP Configuration
795 -------------------------------------------------------------------------- */
796
797 /*
798 * Keep this outside and initialized to 0, for !CONFIG_ACPI builds:
799 */
800 int es7000_plat;
801
802 #ifdef CONFIG_ACPI
803
804 #ifdef CONFIG_X86_IO_APIC
805
806 #define MP_ISA_BUS 0
807
808 extern struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS];
809
810 static int mp_find_ioapic(int gsi)
811 {
812 int i = 0;
813
814 /* Find the IOAPIC that manages this GSI. */
815 for (i = 0; i < nr_ioapics; i++) {
816 if ((gsi >= mp_ioapic_routing[i].gsi_base)
817 && (gsi <= mp_ioapic_routing[i].gsi_end))
818 return i;
819 }
820
821 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
822 return -1;
823 }
824
825 static u8 __init uniq_ioapic_id(u8 id)
826 {
827 #ifdef CONFIG_X86_32
828 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
829 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
830 return io_apic_get_unique_id(nr_ioapics, id);
831 else
832 return id;
833 #else
834 int i;
835 DECLARE_BITMAP(used, 256);
836 bitmap_zero(used, 256);
837 for (i = 0; i < nr_ioapics; i++) {
838 struct mpc_config_ioapic *ia = &mp_ioapics[i];
839 __set_bit(ia->mpc_apicid, used);
840 }
841 if (!test_bit(id, used))
842 return id;
843 return find_first_zero_bit(used, 256);
844 #endif
845 }
846
847 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
848 {
849 int idx = 0;
850
851 if (bad_ioapic(address))
852 return;
853
854 idx = nr_ioapics;
855
856 mp_ioapics[idx].mpc_type = MP_IOAPIC;
857 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
858 mp_ioapics[idx].mpc_apicaddr = address;
859
860 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
861 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
862 #ifdef CONFIG_X86_32
863 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
864 #else
865 mp_ioapics[idx].mpc_apicver = 0;
866 #endif
867 /*
868 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
869 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
870 */
871 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
872 mp_ioapic_routing[idx].gsi_base = gsi_base;
873 mp_ioapic_routing[idx].gsi_end = gsi_base +
874 io_apic_get_redir_entries(idx);
875
876 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
877 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
878 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
879 mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);
880
881 nr_ioapics++;
882 }
883
884 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
885 {
886 struct mpc_config_intsrc intsrc;
887 int ioapic = -1;
888 int pin = -1;
889
890 /*
891 * Convert 'gsi' to 'ioapic.pin'.
892 */
893 ioapic = mp_find_ioapic(gsi);
894 if (ioapic < 0)
895 return;
896 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
897
898 /*
899 * TBD: This check is for faulty timer entries, where the override
900 * erroneously sets the trigger to level, resulting in a HUGE
901 * increase of timer interrupts!
902 */
903 if ((bus_irq == 0) && (trigger == 3))
904 trigger = 1;
905
906 intsrc.mpc_type = MP_INTSRC;
907 intsrc.mpc_irqtype = mp_INT;
908 intsrc.mpc_irqflag = (trigger << 2) | polarity;
909 intsrc.mpc_srcbus = MP_ISA_BUS;
910 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
911 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
912 intsrc.mpc_dstirq = pin; /* INTIN# */
913
914 MP_intsrc_info(&intsrc);
915 }
916
917 void __init mp_config_acpi_legacy_irqs(void)
918 {
919 struct mpc_config_intsrc intsrc;
920 int i = 0;
921 int ioapic = -1;
922
923 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
924 /*
925 * Fabricate the legacy ISA bus (bus #31).
926 */
927 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
928 #endif
929 set_bit(MP_ISA_BUS, mp_bus_not_pci);
930 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
931
932 /*
933 * Older generations of ES7000 have no legacy identity mappings
934 */
935 if (es7000_plat == 1)
936 return;
937
938 /*
939 * Locate the IOAPIC that manages the ISA IRQs (0-15).
940 */
941 ioapic = mp_find_ioapic(0);
942 if (ioapic < 0)
943 return;
944
945 intsrc.mpc_type = MP_INTSRC;
946 intsrc.mpc_irqflag = 0; /* Conforming */
947 intsrc.mpc_srcbus = MP_ISA_BUS;
948 #ifdef CONFIG_X86_IO_APIC
949 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
950 #endif
951 /*
952 * Use the default configuration for the IRQs 0-15. Unless
953 * overridden by (MADT) interrupt source override entries.
954 */
955 for (i = 0; i < 16; i++) {
956 int idx;
957
958 for (idx = 0; idx < mp_irq_entries; idx++) {
959 struct mpc_config_intsrc *irq = mp_irqs + idx;
960
961 /* Do we already have a mapping for this ISA IRQ? */
962 if (irq->mpc_srcbus == MP_ISA_BUS
963 && irq->mpc_srcbusirq == i)
964 break;
965
966 /* Do we already have a mapping for this IOAPIC pin */
967 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
968 (irq->mpc_dstirq == i))
969 break;
970 }
971
972 if (idx != mp_irq_entries) {
973 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
974 continue; /* IRQ already used */
975 }
976
977 intsrc.mpc_irqtype = mp_INT;
978 intsrc.mpc_srcbusirq = i; /* Identity mapped */
979 intsrc.mpc_dstirq = i;
980
981 MP_intsrc_info(&intsrc);
982 }
983 }
984
985 int mp_register_gsi(u32 gsi, int triggering, int polarity)
986 {
987 int ioapic;
988 int ioapic_pin;
989 #ifdef CONFIG_X86_32
990 #define MAX_GSI_NUM 4096
991 #define IRQ_COMPRESSION_START 64
992
993 static int pci_irq = IRQ_COMPRESSION_START;
994 /*
995 * Mapping between Global System Interrupts, which
996 * represent all possible interrupts, and IRQs
997 * assigned to actual devices.
998 */
999 static int gsi_to_irq[MAX_GSI_NUM];
1000 #else
1001
1002 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
1003 return gsi;
1004 #endif
1005
1006 /* Don't set up the ACPI SCI because it's already set up */
1007 if (acpi_gbl_FADT.sci_interrupt == gsi)
1008 return gsi;
1009
1010 ioapic = mp_find_ioapic(gsi);
1011 if (ioapic < 0) {
1012 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1013 return gsi;
1014 }
1015
1016 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1017
1018 #ifdef CONFIG_X86_32
1019 if (ioapic_renumber_irq)
1020 gsi = ioapic_renumber_irq(ioapic, gsi);
1021 #endif
1022
1023 /*
1024 * Avoid pin reprogramming. PRTs typically include entries
1025 * with redundant pin->gsi mappings (but unique PCI devices);
1026 * we only program the IOAPIC on the first.
1027 */
1028 if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
1029 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1030 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1031 ioapic_pin);
1032 return gsi;
1033 }
1034 if (test_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed)) {
1035 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1036 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1037 #ifdef CONFIG_X86_32
1038 return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]);
1039 #else
1040 return gsi;
1041 #endif
1042 }
1043
1044 set_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed);
1045 #ifdef CONFIG_X86_32
1046 /*
1047 * For GSI >= 64, use IRQ compression
1048 */
1049 if ((gsi >= IRQ_COMPRESSION_START)
1050 && (triggering == ACPI_LEVEL_SENSITIVE)) {
1051 /*
1052 * For PCI devices assign IRQs in order, avoiding gaps
1053 * due to unused I/O APIC pins.
1054 */
1055 int irq = gsi;
1056 if (gsi < MAX_GSI_NUM) {
1057 /*
1058 * Retain the VIA chipset work-around (gsi > 15), but
1059 * avoid a problem where the 8254 timer (IRQ0) is setup
1060 * via an override (so it's not on pin 0 of the ioapic),
1061 * and at the same time, the pin 0 interrupt is a PCI
1062 * type. The gsi > 15 test could cause these two pins
1063 * to be shared as IRQ0, and they are not shareable.
1064 * So test for this condition, and if necessary, avoid
1065 * the pin collision.
1066 */
1067 gsi = pci_irq++;
1068 /*
1069 * Don't assign IRQ used by ACPI SCI
1070 */
1071 if (gsi == acpi_gbl_FADT.sci_interrupt)
1072 gsi = pci_irq++;
1073 gsi_to_irq[irq] = gsi;
1074 } else {
1075 printk(KERN_ERR "GSI %u is too high\n", gsi);
1076 return gsi;
1077 }
1078 }
1079 #endif
1080 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1081 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1082 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1083 return gsi;
1084 }
1085
1086 #endif /* CONFIG_X86_IO_APIC */
1087 #endif /* CONFIG_ACPI */
Linux kernel - Deliverables
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