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Merge branch 'x86/apic' into cpus4096
[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 #include <asm/e820.h>
29 #include <asm/trampoline.h>
30 #include <asm/setup.h>
31
32 #include <mach_apic.h>
33 #ifdef CONFIG_X86_32
34 #include <mach_apicdef.h>
35 #include <mach_mpparse.h>
36 #endif
37
38 /*
39 * Checksum an MP configuration block.
40 */
41
42 static int __init mpf_checksum(unsigned char *mp, int len)
43 {
44 int sum = 0;
45
46 while (len--)
47 sum += *mp++;
48
49 return sum & 0xFF;
50 }
51
52 static void __init MP_processor_info(struct mpc_config_processor *m)
53 {
54 int apicid;
55 char *bootup_cpu = "";
56
57 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
58 disabled_cpus++;
59 return;
60 }
61
62 if (x86_quirks->mpc_apic_id)
63 apicid = x86_quirks->mpc_apic_id(m);
64 else
65 apicid = m->mpc_apicid;
66
67 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
68 bootup_cpu = " (Bootup-CPU)";
69 boot_cpu_physical_apicid = m->mpc_apicid;
70 }
71
72 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
73 generic_processor_info(apicid, m->mpc_apicver);
74 }
75
76 #ifdef CONFIG_X86_IO_APIC
77 static void __init MP_bus_info(struct mpc_config_bus *m)
78 {
79 char str[7];
80 memcpy(str, m->mpc_bustype, 6);
81 str[6] = 0;
82
83 if (x86_quirks->mpc_oem_bus_info)
84 x86_quirks->mpc_oem_bus_info(m, str);
85 else
86 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->mpc_busid, str);
87
88 #if MAX_MP_BUSSES < 256
89 if (m->mpc_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->mpc_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->mpc_busid, mp_bus_not_pci);
99 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
100 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
101 #endif
102 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
103 if (x86_quirks->mpc_oem_pci_bus)
104 x86_quirks->mpc_oem_pci_bus(m);
105
106 clear_bit(m->mpc_busid, mp_bus_not_pci);
107 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
108 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
109 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
110 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
111 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
112 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
113 #endif
114 } else
115 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
116 }
117 #endif
118
119 #ifdef CONFIG_X86_IO_APIC
120
121 static int bad_ioapic(unsigned long address)
122 {
123 if (nr_ioapics >= MAX_IO_APICS) {
124 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
125 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
126 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
127 }
128 if (!address) {
129 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
130 " found in table, skipping!\n");
131 return 1;
132 }
133 return 0;
134 }
135
136 static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
137 {
138 if (!(m->mpc_flags & MPC_APIC_USABLE))
139 return;
140
141 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
142 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
143
144 if (bad_ioapic(m->mpc_apicaddr))
145 return;
146
147 mp_ioapics[nr_ioapics].mp_apicaddr = m->mpc_apicaddr;
148 mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
149 mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
150 mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
151 mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
152 nr_ioapics++;
153 }
154
155 static void print_MP_intsrc_info(struct mpc_config_intsrc *m)
156 {
157 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
158 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
159 m->mpc_irqtype, m->mpc_irqflag & 3,
160 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
161 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
162 }
163
164 static void __init print_mp_irq_info(struct mp_config_intsrc *mp_irq)
165 {
166 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
167 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
168 mp_irq->mp_irqtype, mp_irq->mp_irqflag & 3,
169 (mp_irq->mp_irqflag >> 2) & 3, mp_irq->mp_srcbus,
170 mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq);
171 }
172
173 static void __init assign_to_mp_irq(struct mpc_config_intsrc *m,
174 struct mp_config_intsrc *mp_irq)
175 {
176 mp_irq->mp_dstapic = m->mpc_dstapic;
177 mp_irq->mp_type = m->mpc_type;
178 mp_irq->mp_irqtype = m->mpc_irqtype;
179 mp_irq->mp_irqflag = m->mpc_irqflag;
180 mp_irq->mp_srcbus = m->mpc_srcbus;
181 mp_irq->mp_srcbusirq = m->mpc_srcbusirq;
182 mp_irq->mp_dstirq = m->mpc_dstirq;
183 }
184
185 static void __init assign_to_mpc_intsrc(struct mp_config_intsrc *mp_irq,
186 struct mpc_config_intsrc *m)
187 {
188 m->mpc_dstapic = mp_irq->mp_dstapic;
189 m->mpc_type = mp_irq->mp_type;
190 m->mpc_irqtype = mp_irq->mp_irqtype;
191 m->mpc_irqflag = mp_irq->mp_irqflag;
192 m->mpc_srcbus = mp_irq->mp_srcbus;
193 m->mpc_srcbusirq = mp_irq->mp_srcbusirq;
194 m->mpc_dstirq = mp_irq->mp_dstirq;
195 }
196
197 static int __init mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
198 struct mpc_config_intsrc *m)
199 {
200 if (mp_irq->mp_dstapic != m->mpc_dstapic)
201 return 1;
202 if (mp_irq->mp_type != m->mpc_type)
203 return 2;
204 if (mp_irq->mp_irqtype != m->mpc_irqtype)
205 return 3;
206 if (mp_irq->mp_irqflag != m->mpc_irqflag)
207 return 4;
208 if (mp_irq->mp_srcbus != m->mpc_srcbus)
209 return 5;
210 if (mp_irq->mp_srcbusirq != m->mpc_srcbusirq)
211 return 6;
212 if (mp_irq->mp_dstirq != m->mpc_dstirq)
213 return 7;
214
215 return 0;
216 }
217
218 static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
219 {
220 int i;
221
222 print_MP_intsrc_info(m);
223
224 for (i = 0; i < mp_irq_entries; i++) {
225 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
226 return;
227 }
228
229 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
230 if (++mp_irq_entries == MAX_IRQ_SOURCES)
231 panic("Max # of irq sources exceeded!!\n");
232 }
233
234 #endif
235
236 static void __init MP_lintsrc_info(struct mpc_config_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->mpc_irqtype, m->mpc_irqflag & 3,
241 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
242 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
243 }
244
245 /*
246 * Read/parse the MPC
247 */
248
249 static int __init smp_check_mpc(struct mp_config_table *mpc, char *oem,
250 char *str)
251 {
252
253 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
254 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
255 mpc->mpc_signature[0], mpc->mpc_signature[1],
256 mpc->mpc_signature[2], mpc->mpc_signature[3]);
257 return 0;
258 }
259 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
260 printk(KERN_ERR "MPTABLE: checksum error!\n");
261 return 0;
262 }
263 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
264 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
265 mpc->mpc_spec);
266 return 0;
267 }
268 if (!mpc->mpc_lapic) {
269 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
270 return 0;
271 }
272 memcpy(oem, mpc->mpc_oem, 8);
273 oem[8] = 0;
274 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
275
276 memcpy(str, mpc->mpc_productid, 12);
277 str[12] = 0;
278
279 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
280
281 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
282
283 return 1;
284 }
285
286 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
287 {
288 char str[16];
289 char oem[10];
290
291 int count = sizeof(*mpc);
292 unsigned char *mpt = ((unsigned char *)mpc) + count;
293
294 if (!smp_check_mpc(mpc, oem, str))
295 return 0;
296
297 #ifdef CONFIG_X86_32
298 /*
299 * need to make sure summit and es7000's mps_oem_check is safe to be
300 * called early via genericarch 's mps_oem_check
301 */
302 if (early) {
303 #ifdef CONFIG_X86_NUMAQ
304 numaq_mps_oem_check(mpc, oem, str);
305 #endif
306 } else
307 mps_oem_check(mpc, oem, str);
308 #endif
309 /* save the local APIC address, it might be non-default */
310 if (!acpi_lapic)
311 mp_lapic_addr = mpc->mpc_lapic;
312
313 if (early)
314 return 1;
315
316 if (mpc->mpc_oemptr && x86_quirks->smp_read_mpc_oem) {
317 struct mp_config_oemtable *oem_table = (struct mp_config_oemtable *)(unsigned long)mpc->mpc_oemptr;
318 x86_quirks->smp_read_mpc_oem(oem_table, mpc->mpc_oemsize);
319 }
320
321 /*
322 * Now process the configuration blocks.
323 */
324 if (x86_quirks->mpc_record)
325 *x86_quirks->mpc_record = 0;
326
327 while (count < mpc->mpc_length) {
328 switch (*mpt) {
329 case MP_PROCESSOR:
330 {
331 struct mpc_config_processor *m =
332 (struct mpc_config_processor *)mpt;
333 /* ACPI may have already provided this data */
334 if (!acpi_lapic)
335 MP_processor_info(m);
336 mpt += sizeof(*m);
337 count += sizeof(*m);
338 break;
339 }
340 case MP_BUS:
341 {
342 struct mpc_config_bus *m =
343 (struct mpc_config_bus *)mpt;
344 #ifdef CONFIG_X86_IO_APIC
345 MP_bus_info(m);
346 #endif
347 mpt += sizeof(*m);
348 count += sizeof(*m);
349 break;
350 }
351 case MP_IOAPIC:
352 {
353 #ifdef CONFIG_X86_IO_APIC
354 struct mpc_config_ioapic *m =
355 (struct mpc_config_ioapic *)mpt;
356 MP_ioapic_info(m);
357 #endif
358 mpt += sizeof(struct mpc_config_ioapic);
359 count += sizeof(struct mpc_config_ioapic);
360 break;
361 }
362 case MP_INTSRC:
363 {
364 #ifdef CONFIG_X86_IO_APIC
365 struct mpc_config_intsrc *m =
366 (struct mpc_config_intsrc *)mpt;
367
368 MP_intsrc_info(m);
369 #endif
370 mpt += sizeof(struct mpc_config_intsrc);
371 count += sizeof(struct mpc_config_intsrc);
372 break;
373 }
374 case MP_LINTSRC:
375 {
376 struct mpc_config_lintsrc *m =
377 (struct mpc_config_lintsrc *)mpt;
378 MP_lintsrc_info(m);
379 mpt += sizeof(*m);
380 count += sizeof(*m);
381 break;
382 }
383 default:
384 /* wrong mptable */
385 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
386 printk(KERN_ERR "type %x\n", *mpt);
387 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
388 1, mpc, mpc->mpc_length, 1);
389 count = mpc->mpc_length;
390 break;
391 }
392 if (x86_quirks->mpc_record)
393 (*x86_quirks->mpc_record)++;
394 }
395
396 #ifdef CONFIG_X86_GENERICARCH
397 generic_bigsmp_probe();
398 #endif
399
400 #ifdef CONFIG_X86_32
401 setup_apic_routing();
402 #endif
403 if (!num_processors)
404 printk(KERN_ERR "MPTABLE: no processors registered!\n");
405 return num_processors;
406 }
407
408 #ifdef CONFIG_X86_IO_APIC
409
410 static int __init ELCR_trigger(unsigned int irq)
411 {
412 unsigned int port;
413
414 port = 0x4d0 + (irq >> 3);
415 return (inb(port) >> (irq & 7)) & 1;
416 }
417
418 static void __init construct_default_ioirq_mptable(int mpc_default_type)
419 {
420 struct mpc_config_intsrc intsrc;
421 int i;
422 int ELCR_fallback = 0;
423
424 intsrc.mpc_type = MP_INTSRC;
425 intsrc.mpc_irqflag = 0; /* conforming */
426 intsrc.mpc_srcbus = 0;
427 intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
428
429 intsrc.mpc_irqtype = mp_INT;
430
431 /*
432 * If true, we have an ISA/PCI system with no IRQ entries
433 * in the MP table. To prevent the PCI interrupts from being set up
434 * incorrectly, we try to use the ELCR. The sanity check to see if
435 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
436 * never be level sensitive, so we simply see if the ELCR agrees.
437 * If it does, we assume it's valid.
438 */
439 if (mpc_default_type == 5) {
440 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
441 "falling back to ELCR\n");
442
443 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
444 ELCR_trigger(13))
445 printk(KERN_ERR "ELCR contains invalid data... "
446 "not using ELCR\n");
447 else {
448 printk(KERN_INFO
449 "Using ELCR to identify PCI interrupts\n");
450 ELCR_fallback = 1;
451 }
452 }
453
454 for (i = 0; i < 16; i++) {
455 switch (mpc_default_type) {
456 case 2:
457 if (i == 0 || i == 13)
458 continue; /* IRQ0 & IRQ13 not connected */
459 /* fall through */
460 default:
461 if (i == 2)
462 continue; /* IRQ2 is never connected */
463 }
464
465 if (ELCR_fallback) {
466 /*
467 * If the ELCR indicates a level-sensitive interrupt, we
468 * copy that information over to the MP table in the
469 * irqflag field (level sensitive, active high polarity).
470 */
471 if (ELCR_trigger(i))
472 intsrc.mpc_irqflag = 13;
473 else
474 intsrc.mpc_irqflag = 0;
475 }
476
477 intsrc.mpc_srcbusirq = i;
478 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
479 MP_intsrc_info(&intsrc);
480 }
481
482 intsrc.mpc_irqtype = mp_ExtINT;
483 intsrc.mpc_srcbusirq = 0;
484 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
485 MP_intsrc_info(&intsrc);
486 }
487
488
489 static void __init construct_ioapic_table(int mpc_default_type)
490 {
491 struct mpc_config_ioapic ioapic;
492 struct mpc_config_bus bus;
493
494 bus.mpc_type = MP_BUS;
495 bus.mpc_busid = 0;
496 switch (mpc_default_type) {
497 default:
498 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
499 mpc_default_type);
500 /* fall through */
501 case 1:
502 case 5:
503 memcpy(bus.mpc_bustype, "ISA ", 6);
504 break;
505 case 2:
506 case 6:
507 case 3:
508 memcpy(bus.mpc_bustype, "EISA ", 6);
509 break;
510 case 4:
511 case 7:
512 memcpy(bus.mpc_bustype, "MCA ", 6);
513 }
514 MP_bus_info(&bus);
515 if (mpc_default_type > 4) {
516 bus.mpc_busid = 1;
517 memcpy(bus.mpc_bustype, "PCI ", 6);
518 MP_bus_info(&bus);
519 }
520
521 ioapic.mpc_type = MP_IOAPIC;
522 ioapic.mpc_apicid = 2;
523 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
524 ioapic.mpc_flags = MPC_APIC_USABLE;
525 ioapic.mpc_apicaddr = 0xFEC00000;
526 MP_ioapic_info(&ioapic);
527
528 /*
529 * We set up most of the low 16 IO-APIC pins according to MPS rules.
530 */
531 construct_default_ioirq_mptable(mpc_default_type);
532 }
533 #else
534 static inline void __init construct_ioapic_table(int mpc_default_type) { }
535 #endif
536
537 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
538 {
539 struct mpc_config_processor processor;
540 struct mpc_config_lintsrc lintsrc;
541 int linttypes[2] = { mp_ExtINT, mp_NMI };
542 int i;
543
544 /*
545 * local APIC has default address
546 */
547 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
548
549 /*
550 * 2 CPUs, numbered 0 & 1.
551 */
552 processor.mpc_type = MP_PROCESSOR;
553 /* Either an integrated APIC or a discrete 82489DX. */
554 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
555 processor.mpc_cpuflag = CPU_ENABLED;
556 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
557 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
558 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
559 processor.mpc_reserved[0] = 0;
560 processor.mpc_reserved[1] = 0;
561 for (i = 0; i < 2; i++) {
562 processor.mpc_apicid = i;
563 MP_processor_info(&processor);
564 }
565
566 construct_ioapic_table(mpc_default_type);
567
568 lintsrc.mpc_type = MP_LINTSRC;
569 lintsrc.mpc_irqflag = 0; /* conforming */
570 lintsrc.mpc_srcbusid = 0;
571 lintsrc.mpc_srcbusirq = 0;
572 lintsrc.mpc_destapic = MP_APIC_ALL;
573 for (i = 0; i < 2; i++) {
574 lintsrc.mpc_irqtype = linttypes[i];
575 lintsrc.mpc_destapiclint = i;
576 MP_lintsrc_info(&lintsrc);
577 }
578 }
579
580 static struct intel_mp_floating *mpf_found;
581
582 /*
583 * Scan the memory blocks for an SMP configuration block.
584 */
585 static void __init __get_smp_config(unsigned int early)
586 {
587 struct intel_mp_floating *mpf = mpf_found;
588
589 if (!mpf)
590 return;
591
592 if (acpi_lapic && early)
593 return;
594
595 /*
596 * MPS doesn't support hyperthreading, aka only have
597 * thread 0 apic id in MPS table
598 */
599 if (acpi_lapic && acpi_ioapic)
600 return;
601
602 if (x86_quirks->mach_get_smp_config) {
603 if (x86_quirks->mach_get_smp_config(early))
604 return;
605 }
606
607 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
608 mpf->mpf_specification);
609 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
610 if (mpf->mpf_feature2 & (1 << 7)) {
611 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
612 pic_mode = 1;
613 } else {
614 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
615 pic_mode = 0;
616 }
617 #endif
618 /*
619 * Now see if we need to read further.
620 */
621 if (mpf->mpf_feature1 != 0) {
622 if (early) {
623 /*
624 * local APIC has default address
625 */
626 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
627 return;
628 }
629
630 printk(KERN_INFO "Default MP configuration #%d\n",
631 mpf->mpf_feature1);
632 construct_default_ISA_mptable(mpf->mpf_feature1);
633
634 } else if (mpf->mpf_physptr) {
635
636 /*
637 * Read the physical hardware table. Anything here will
638 * override the defaults.
639 */
640 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
641 #ifdef CONFIG_X86_LOCAL_APIC
642 smp_found_config = 0;
643 #endif
644 printk(KERN_ERR
645 "BIOS bug, MP table errors detected!...\n");
646 printk(KERN_ERR "... disabling SMP support. "
647 "(tell your hw vendor)\n");
648 return;
649 }
650
651 if (early)
652 return;
653 #ifdef CONFIG_X86_IO_APIC
654 /*
655 * If there are no explicit MP IRQ entries, then we are
656 * broken. We set up most of the low 16 IO-APIC pins to
657 * ISA defaults and hope it will work.
658 */
659 if (!mp_irq_entries) {
660 struct mpc_config_bus bus;
661
662 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
663 "using default mptable. "
664 "(tell your hw vendor)\n");
665
666 bus.mpc_type = MP_BUS;
667 bus.mpc_busid = 0;
668 memcpy(bus.mpc_bustype, "ISA ", 6);
669 MP_bus_info(&bus);
670
671 construct_default_ioirq_mptable(0);
672 }
673 #endif
674 } else
675 BUG();
676
677 if (!early)
678 printk(KERN_INFO "Processors: %d\n", num_processors);
679 /*
680 * Only use the first configuration found.
681 */
682 }
683
684 void __init early_get_smp_config(void)
685 {
686 __get_smp_config(1);
687 }
688
689 void __init get_smp_config(void)
690 {
691 __get_smp_config(0);
692 }
693
694 static int __init smp_scan_config(unsigned long base, unsigned long length,
695 unsigned reserve)
696 {
697 unsigned int *bp = phys_to_virt(base);
698 struct intel_mp_floating *mpf;
699
700 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
701 bp, length);
702 BUILD_BUG_ON(sizeof(*mpf) != 16);
703
704 while (length > 0) {
705 mpf = (struct intel_mp_floating *)bp;
706 if ((*bp == SMP_MAGIC_IDENT) &&
707 (mpf->mpf_length == 1) &&
708 !mpf_checksum((unsigned char *)bp, 16) &&
709 ((mpf->mpf_specification == 1)
710 || (mpf->mpf_specification == 4))) {
711 #ifdef CONFIG_X86_LOCAL_APIC
712 smp_found_config = 1;
713 #endif
714 mpf_found = mpf;
715
716 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
717 mpf, virt_to_phys(mpf));
718
719 if (!reserve)
720 return 1;
721 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
722 BOOTMEM_DEFAULT);
723 if (mpf->mpf_physptr) {
724 unsigned long size = PAGE_SIZE;
725 #ifdef CONFIG_X86_32
726 /*
727 * We cannot access to MPC table to compute
728 * table size yet, as only few megabytes from
729 * the bottom is mapped now.
730 * PC-9800's MPC table places on the very last
731 * of physical memory; so that simply reserving
732 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
733 * in reserve_bootmem.
734 */
735 unsigned long end = max_low_pfn * PAGE_SIZE;
736 if (mpf->mpf_physptr + size > end)
737 size = end - mpf->mpf_physptr;
738 #endif
739 reserve_bootmem_generic(mpf->mpf_physptr, size,
740 BOOTMEM_DEFAULT);
741 }
742
743 return 1;
744 }
745 bp += 4;
746 length -= 16;
747 }
748 return 0;
749 }
750
751 static void __init __find_smp_config(unsigned int reserve)
752 {
753 unsigned int address;
754
755 if (x86_quirks->mach_find_smp_config) {
756 if (x86_quirks->mach_find_smp_config(reserve))
757 return;
758 }
759 /*
760 * FIXME: Linux assumes you have 640K of base ram..
761 * this continues the error...
762 *
763 * 1) Scan the bottom 1K for a signature
764 * 2) Scan the top 1K of base RAM
765 * 3) Scan the 64K of bios
766 */
767 if (smp_scan_config(0x0, 0x400, reserve) ||
768 smp_scan_config(639 * 0x400, 0x400, reserve) ||
769 smp_scan_config(0xF0000, 0x10000, reserve))
770 return;
771 /*
772 * If it is an SMP machine we should know now, unless the
773 * configuration is in an EISA/MCA bus machine with an
774 * extended bios data area.
775 *
776 * there is a real-mode segmented pointer pointing to the
777 * 4K EBDA area at 0x40E, calculate and scan it here.
778 *
779 * NOTE! There are Linux loaders that will corrupt the EBDA
780 * area, and as such this kind of SMP config may be less
781 * trustworthy, simply because the SMP table may have been
782 * stomped on during early boot. These loaders are buggy and
783 * should be fixed.
784 *
785 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
786 */
787
788 address = get_bios_ebda();
789 if (address)
790 smp_scan_config(address, 0x400, reserve);
791 }
792
793 void __init early_find_smp_config(void)
794 {
795 __find_smp_config(0);
796 }
797
798 void __init find_smp_config(void)
799 {
800 __find_smp_config(1);
801 }
802
803 #ifdef CONFIG_X86_IO_APIC
804 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
805
806 static int __init get_MP_intsrc_index(struct mpc_config_intsrc *m)
807 {
808 int i;
809
810 if (m->mpc_irqtype != mp_INT)
811 return 0;
812
813 if (m->mpc_irqflag != 0x0f)
814 return 0;
815
816 /* not legacy */
817
818 for (i = 0; i < mp_irq_entries; i++) {
819 if (mp_irqs[i].mp_irqtype != mp_INT)
820 continue;
821
822 if (mp_irqs[i].mp_irqflag != 0x0f)
823 continue;
824
825 if (mp_irqs[i].mp_srcbus != m->mpc_srcbus)
826 continue;
827 if (mp_irqs[i].mp_srcbusirq != m->mpc_srcbusirq)
828 continue;
829 if (irq_used[i]) {
830 /* already claimed */
831 return -2;
832 }
833 irq_used[i] = 1;
834 return i;
835 }
836
837 /* not found */
838 return -1;
839 }
840
841 #define SPARE_SLOT_NUM 20
842
843 static struct mpc_config_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
844 #endif
845
846 static int __init replace_intsrc_all(struct mp_config_table *mpc,
847 unsigned long mpc_new_phys,
848 unsigned long mpc_new_length)
849 {
850 #ifdef CONFIG_X86_IO_APIC
851 int i;
852 int nr_m_spare = 0;
853 #endif
854
855 int count = sizeof(*mpc);
856 unsigned char *mpt = ((unsigned char *)mpc) + count;
857
858 printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
859 while (count < mpc->mpc_length) {
860 switch (*mpt) {
861 case MP_PROCESSOR:
862 {
863 struct mpc_config_processor *m =
864 (struct mpc_config_processor *)mpt;
865 mpt += sizeof(*m);
866 count += sizeof(*m);
867 break;
868 }
869 case MP_BUS:
870 {
871 struct mpc_config_bus *m =
872 (struct mpc_config_bus *)mpt;
873 mpt += sizeof(*m);
874 count += sizeof(*m);
875 break;
876 }
877 case MP_IOAPIC:
878 {
879 mpt += sizeof(struct mpc_config_ioapic);
880 count += sizeof(struct mpc_config_ioapic);
881 break;
882 }
883 case MP_INTSRC:
884 {
885 #ifdef CONFIG_X86_IO_APIC
886 struct mpc_config_intsrc *m =
887 (struct mpc_config_intsrc *)mpt;
888
889 printk(KERN_INFO "OLD ");
890 print_MP_intsrc_info(m);
891 i = get_MP_intsrc_index(m);
892 if (i > 0) {
893 assign_to_mpc_intsrc(&mp_irqs[i], m);
894 printk(KERN_INFO "NEW ");
895 print_mp_irq_info(&mp_irqs[i]);
896 } else if (!i) {
897 /* legacy, do nothing */
898 } else if (nr_m_spare < SPARE_SLOT_NUM) {
899 /*
900 * not found (-1), or duplicated (-2)
901 * are invalid entries,
902 * we need to use the slot later
903 */
904 m_spare[nr_m_spare] = m;
905 nr_m_spare++;
906 }
907 #endif
908 mpt += sizeof(struct mpc_config_intsrc);
909 count += sizeof(struct mpc_config_intsrc);
910 break;
911 }
912 case MP_LINTSRC:
913 {
914 struct mpc_config_lintsrc *m =
915 (struct mpc_config_lintsrc *)mpt;
916 mpt += sizeof(*m);
917 count += sizeof(*m);
918 break;
919 }
920 default:
921 /* wrong mptable */
922 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
923 printk(KERN_ERR "type %x\n", *mpt);
924 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
925 1, mpc, mpc->mpc_length, 1);
926 goto out;
927 }
928 }
929
930 #ifdef CONFIG_X86_IO_APIC
931 for (i = 0; i < mp_irq_entries; i++) {
932 if (irq_used[i])
933 continue;
934
935 if (mp_irqs[i].mp_irqtype != mp_INT)
936 continue;
937
938 if (mp_irqs[i].mp_irqflag != 0x0f)
939 continue;
940
941 if (nr_m_spare > 0) {
942 printk(KERN_INFO "*NEW* found ");
943 nr_m_spare--;
944 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
945 m_spare[nr_m_spare] = NULL;
946 } else {
947 struct mpc_config_intsrc *m =
948 (struct mpc_config_intsrc *)mpt;
949 count += sizeof(struct mpc_config_intsrc);
950 if (!mpc_new_phys) {
951 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
952 } else {
953 if (count <= mpc_new_length)
954 printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
955 else {
956 printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
957 goto out;
958 }
959 }
960 assign_to_mpc_intsrc(&mp_irqs[i], m);
961 mpc->mpc_length = count;
962 mpt += sizeof(struct mpc_config_intsrc);
963 }
964 print_mp_irq_info(&mp_irqs[i]);
965 }
966 #endif
967 out:
968 /* update checksum */
969 mpc->mpc_checksum = 0;
970 mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
971 mpc->mpc_length);
972
973 return 0;
974 }
975
976 static int __initdata enable_update_mptable;
977
978 static int __init update_mptable_setup(char *str)
979 {
980 enable_update_mptable = 1;
981 return 0;
982 }
983 early_param("update_mptable", update_mptable_setup);
984
985 static unsigned long __initdata mpc_new_phys;
986 static unsigned long mpc_new_length __initdata = 4096;
987
988 /* alloc_mptable or alloc_mptable=4k */
989 static int __initdata alloc_mptable;
990 static int __init parse_alloc_mptable_opt(char *p)
991 {
992 enable_update_mptable = 1;
993 alloc_mptable = 1;
994 if (!p)
995 return 0;
996 mpc_new_length = memparse(p, &p);
997 return 0;
998 }
999 early_param("alloc_mptable", parse_alloc_mptable_opt);
1000
1001 void __init early_reserve_e820_mpc_new(void)
1002 {
1003 if (enable_update_mptable && alloc_mptable) {
1004 u64 startt = 0;
1005 #ifdef CONFIG_X86_TRAMPOLINE
1006 startt = TRAMPOLINE_BASE;
1007 #endif
1008 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1009 }
1010 }
1011
1012 static int __init update_mp_table(void)
1013 {
1014 char str[16];
1015 char oem[10];
1016 struct intel_mp_floating *mpf;
1017 struct mp_config_table *mpc;
1018 struct mp_config_table *mpc_new;
1019
1020 if (!enable_update_mptable)
1021 return 0;
1022
1023 mpf = mpf_found;
1024 if (!mpf)
1025 return 0;
1026
1027 /*
1028 * Now see if we need to go further.
1029 */
1030 if (mpf->mpf_feature1 != 0)
1031 return 0;
1032
1033 if (!mpf->mpf_physptr)
1034 return 0;
1035
1036 mpc = phys_to_virt(mpf->mpf_physptr);
1037
1038 if (!smp_check_mpc(mpc, oem, str))
1039 return 0;
1040
1041 printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1042 printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
1043
1044 if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
1045 mpc_new_phys = 0;
1046 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1047 mpc_new_length);
1048 }
1049
1050 if (!mpc_new_phys) {
1051 unsigned char old, new;
1052 /* check if we can change the postion */
1053 mpc->mpc_checksum = 0;
1054 old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1055 mpc->mpc_checksum = 0xff;
1056 new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1057 if (old == new) {
1058 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1059 return 0;
1060 }
1061 printk(KERN_INFO "use in-positon replacing\n");
1062 } else {
1063 mpf->mpf_physptr = mpc_new_phys;
1064 mpc_new = phys_to_virt(mpc_new_phys);
1065 memcpy(mpc_new, mpc, mpc->mpc_length);
1066 mpc = mpc_new;
1067 /* check if we can modify that */
1068 if (mpc_new_phys - mpf->mpf_physptr) {
1069 struct intel_mp_floating *mpf_new;
1070 /* steal 16 bytes from [0, 1k) */
1071 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1072 mpf_new = phys_to_virt(0x400 - 16);
1073 memcpy(mpf_new, mpf, 16);
1074 mpf = mpf_new;
1075 mpf->mpf_physptr = mpc_new_phys;
1076 }
1077 mpf->mpf_checksum = 0;
1078 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
1079 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
1080 }
1081
1082 /*
1083 * only replace the one with mp_INT and
1084 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1085 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1086 * may need pci=routeirq for all coverage
1087 */
1088 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1089
1090 return 0;
1091 }
1092
1093 late_initcall(update_mp_table);
Linux kernel - Deliverables
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