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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel Multiprocessor Specification 1.1 and 1.4
4 * compliant MP-table parsing routines.
5 *
6 * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
7 * (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com>
8 * (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
9 */
10
11#include <linux/mm.h>
12#include <linux/init.h>
13#include <linux/delay.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/smp.h>
20#include <linux/pci.h>
21
22#include <asm/irqdomain.h>
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/api.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
38static 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
48int __init default_mpc_apic_id(struct mpc_cpu *m)
49{
50 return m->apicid;
51}
52
53static 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 pr_info("Processor #%d%s\n", m->apicid, bootup_cpu);
71 generic_processor_info(apicid, m->apicver);
72}
73
74#ifdef CONFIG_X86_IO_APIC
75void __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
82static 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 pr_warn("MP table busid value (%d) for bustype %s is too large, max. supported is %d\n",
91 m->busid, str, MAX_MP_BUSSES - 1);
92 return;
93 }
94#endif
95
96 set_bit(m->busid, mp_bus_not_pci);
97 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
98#ifdef CONFIG_EISA
99 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
100#endif
101 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
102 if (x86_init.mpparse.mpc_oem_pci_bus)
103 x86_init.mpparse.mpc_oem_pci_bus(m);
104
105 clear_bit(m->busid, mp_bus_not_pci);
106#ifdef CONFIG_EISA
107 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
108 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
109 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
110#endif
111 } else
112 pr_warn("Unknown bustype %s - ignoring\n", str);
113}
114
115static void __init MP_ioapic_info(struct mpc_ioapic *m)
116{
117 struct ioapic_domain_cfg cfg = {
118 .type = IOAPIC_DOMAIN_LEGACY,
119 .ops = &mp_ioapic_irqdomain_ops,
120 };
121
122 if (m->flags & MPC_APIC_USABLE)
123 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top, &cfg);
124}
125
126static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
127{
128 apic_printk(APIC_VERBOSE,
129 "Int: type %d, pol %d, trig %d, bus %02x, IRQ %02x, APIC ID %x, APIC INT %02x\n",
130 mp_irq->irqtype, mp_irq->irqflag & 3,
131 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
132 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
133}
134
135#else /* CONFIG_X86_IO_APIC */
136static inline void __init MP_bus_info(struct mpc_bus *m) {}
137static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
138#endif /* CONFIG_X86_IO_APIC */
139
140static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
141{
142 apic_printk(APIC_VERBOSE,
143 "Lint: type %d, pol %d, trig %d, bus %02x, IRQ %02x, APIC ID %x, APIC LINT %02x\n",
144 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
145 m->srcbusirq, m->destapic, m->destapiclint);
146}
147
148/*
149 * Read/parse the MPC
150 */
151static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
152{
153
154 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
155 pr_err("MPTABLE: bad signature [%c%c%c%c]!\n",
156 mpc->signature[0], mpc->signature[1],
157 mpc->signature[2], mpc->signature[3]);
158 return 0;
159 }
160 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
161 pr_err("MPTABLE: checksum error!\n");
162 return 0;
163 }
164 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
165 pr_err("MPTABLE: bad table version (%d)!!\n", mpc->spec);
166 return 0;
167 }
168 if (!mpc->lapic) {
169 pr_err("MPTABLE: null local APIC address!\n");
170 return 0;
171 }
172 memcpy(oem, mpc->oem, 8);
173 oem[8] = 0;
174 pr_info("MPTABLE: OEM ID: %s\n", oem);
175
176 memcpy(str, mpc->productid, 12);
177 str[12] = 0;
178
179 pr_info("MPTABLE: Product ID: %s\n", str);
180
181 pr_info("MPTABLE: APIC at: 0x%X\n", mpc->lapic);
182
183 return 1;
184}
185
186static void skip_entry(unsigned char **ptr, int *count, int size)
187{
188 *ptr += size;
189 *count += size;
190}
191
192static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
193{
194 pr_err("Your mptable is wrong, contact your HW vendor!\n");
195 pr_cont("type %x\n", *mpt);
196 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
197 1, mpc, mpc->length, 1);
198}
199
200void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
201
202static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
203{
204 char str[16];
205 char oem[10];
206
207 int count = sizeof(*mpc);
208 unsigned char *mpt = ((unsigned char *)mpc) + count;
209
210 if (!smp_check_mpc(mpc, oem, str))
211 return 0;
212
213 /* Initialize the lapic mapping */
214 if (!acpi_lapic)
215 register_lapic_address(mpc->lapic);
216
217 if (early)
218 return 1;
219
220 if (mpc->oemptr)
221 x86_init.mpparse.smp_read_mpc_oem(mpc);
222
223 /*
224 * Now process the configuration blocks.
225 */
226 x86_init.mpparse.mpc_record(0);
227
228 while (count < mpc->length) {
229 switch (*mpt) {
230 case MP_PROCESSOR:
231 /* ACPI may have already provided this data */
232 if (!acpi_lapic)
233 MP_processor_info((struct mpc_cpu *)mpt);
234 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
235 break;
236 case MP_BUS:
237 MP_bus_info((struct mpc_bus *)mpt);
238 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
239 break;
240 case MP_IOAPIC:
241 MP_ioapic_info((struct mpc_ioapic *)mpt);
242 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
243 break;
244 case MP_INTSRC:
245 mp_save_irq((struct mpc_intsrc *)mpt);
246 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
247 break;
248 case MP_LINTSRC:
249 MP_lintsrc_info((struct mpc_lintsrc *)mpt);
250 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
251 break;
252 default:
253 /* wrong mptable */
254 smp_dump_mptable(mpc, mpt);
255 count = mpc->length;
256 break;
257 }
258 x86_init.mpparse.mpc_record(1);
259 }
260
261 if (!num_processors)
262 pr_err("MPTABLE: no processors registered!\n");
263 return num_processors;
264}
265
266#ifdef CONFIG_X86_IO_APIC
267
268static int __init ELCR_trigger(unsigned int irq)
269{
270 unsigned int port;
271
272 port = 0x4d0 + (irq >> 3);
273 return (inb(port) >> (irq & 7)) & 1;
274}
275
276static void __init construct_default_ioirq_mptable(int mpc_default_type)
277{
278 struct mpc_intsrc intsrc;
279 int i;
280 int ELCR_fallback = 0;
281
282 intsrc.type = MP_INTSRC;
283 intsrc.irqflag = MP_IRQTRIG_DEFAULT | MP_IRQPOL_DEFAULT;
284 intsrc.srcbus = 0;
285 intsrc.dstapic = mpc_ioapic_id(0);
286
287 intsrc.irqtype = mp_INT;
288
289 /*
290 * If true, we have an ISA/PCI system with no IRQ entries
291 * in the MP table. To prevent the PCI interrupts from being set up
292 * incorrectly, we try to use the ELCR. The sanity check to see if
293 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
294 * never be level sensitive, so we simply see if the ELCR agrees.
295 * If it does, we assume it's valid.
296 */
297 if (mpc_default_type == 5) {
298 pr_info("ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
299
300 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
301 ELCR_trigger(13))
302 pr_err("ELCR contains invalid data... not using ELCR\n");
303 else {
304 pr_info("Using ELCR to identify PCI interrupts\n");
305 ELCR_fallback = 1;
306 }
307 }
308
309 for (i = 0; i < 16; i++) {
310 switch (mpc_default_type) {
311 case 2:
312 if (i == 0 || i == 13)
313 continue; /* IRQ0 & IRQ13 not connected */
314 /* fall through */
315 default:
316 if (i == 2)
317 continue; /* IRQ2 is never connected */
318 }
319
320 if (ELCR_fallback) {
321 /*
322 * If the ELCR indicates a level-sensitive interrupt, we
323 * copy that information over to the MP table in the
324 * irqflag field (level sensitive, active high polarity).
325 */
326 if (ELCR_trigger(i)) {
327 intsrc.irqflag = MP_IRQTRIG_LEVEL |
328 MP_IRQPOL_ACTIVE_HIGH;
329 } else {
330 intsrc.irqflag = MP_IRQTRIG_DEFAULT |
331 MP_IRQPOL_DEFAULT;
332 }
333 }
334
335 intsrc.srcbusirq = i;
336 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
337 mp_save_irq(&intsrc);
338 }
339
340 intsrc.irqtype = mp_ExtINT;
341 intsrc.srcbusirq = 0;
342 intsrc.dstirq = 0; /* 8259A to INTIN0 */
343 mp_save_irq(&intsrc);
344}
345
346
347static void __init construct_ioapic_table(int mpc_default_type)
348{
349 struct mpc_ioapic ioapic;
350 struct mpc_bus bus;
351
352 bus.type = MP_BUS;
353 bus.busid = 0;
354 switch (mpc_default_type) {
355 default:
356 pr_err("???\nUnknown standard configuration %d\n",
357 mpc_default_type);
358 /* fall through */
359 case 1:
360 case 5:
361 memcpy(bus.bustype, "ISA ", 6);
362 break;
363 case 2:
364 case 6:
365 case 3:
366 memcpy(bus.bustype, "EISA ", 6);
367 break;
368 }
369 MP_bus_info(&bus);
370 if (mpc_default_type > 4) {
371 bus.busid = 1;
372 memcpy(bus.bustype, "PCI ", 6);
373 MP_bus_info(&bus);
374 }
375
376 ioapic.type = MP_IOAPIC;
377 ioapic.apicid = 2;
378 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
379 ioapic.flags = MPC_APIC_USABLE;
380 ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
381 MP_ioapic_info(&ioapic);
382
383 /*
384 * We set up most of the low 16 IO-APIC pins according to MPS rules.
385 */
386 construct_default_ioirq_mptable(mpc_default_type);
387}
388#else
389static inline void __init construct_ioapic_table(int mpc_default_type) { }
390#endif
391
392static inline void __init construct_default_ISA_mptable(int mpc_default_type)
393{
394 struct mpc_cpu processor;
395 struct mpc_lintsrc lintsrc;
396 int linttypes[2] = { mp_ExtINT, mp_NMI };
397 int i;
398
399 /*
400 * local APIC has default address
401 */
402 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
403
404 /*
405 * 2 CPUs, numbered 0 & 1.
406 */
407 processor.type = MP_PROCESSOR;
408 /* Either an integrated APIC or a discrete 82489DX. */
409 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
410 processor.cpuflag = CPU_ENABLED;
411 processor.cpufeature = (boot_cpu_data.x86 << 8) |
412 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_stepping;
413 processor.featureflag = boot_cpu_data.x86_capability[CPUID_1_EDX];
414 processor.reserved[0] = 0;
415 processor.reserved[1] = 0;
416 for (i = 0; i < 2; i++) {
417 processor.apicid = i;
418 MP_processor_info(&processor);
419 }
420
421 construct_ioapic_table(mpc_default_type);
422
423 lintsrc.type = MP_LINTSRC;
424 lintsrc.irqflag = MP_IRQTRIG_DEFAULT | MP_IRQPOL_DEFAULT;
425 lintsrc.srcbusid = 0;
426 lintsrc.srcbusirq = 0;
427 lintsrc.destapic = MP_APIC_ALL;
428 for (i = 0; i < 2; i++) {
429 lintsrc.irqtype = linttypes[i];
430 lintsrc.destapiclint = i;
431 MP_lintsrc_info(&lintsrc);
432 }
433}
434
435static unsigned long mpf_base;
436static bool mpf_found;
437
438static unsigned long __init get_mpc_size(unsigned long physptr)
439{
440 struct mpc_table *mpc;
441 unsigned long size;
442
443 mpc = early_memremap(physptr, PAGE_SIZE);
444 size = mpc->length;
445 early_memunmap(mpc, PAGE_SIZE);
446 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
447
448 return size;
449}
450
451static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
452{
453 struct mpc_table *mpc;
454 unsigned long size;
455
456 size = get_mpc_size(mpf->physptr);
457 mpc = early_memremap(mpf->physptr, size);
458
459 /*
460 * Read the physical hardware table. Anything here will
461 * override the defaults.
462 */
463 if (!smp_read_mpc(mpc, early)) {
464#ifdef CONFIG_X86_LOCAL_APIC
465 smp_found_config = 0;
466#endif
467 pr_err("BIOS bug, MP table errors detected!...\n");
468 pr_cont("... disabling SMP support. (tell your hw vendor)\n");
469 early_memunmap(mpc, size);
470 return -1;
471 }
472 early_memunmap(mpc, size);
473
474 if (early)
475 return -1;
476
477#ifdef CONFIG_X86_IO_APIC
478 /*
479 * If there are no explicit MP IRQ entries, then we are
480 * broken. We set up most of the low 16 IO-APIC pins to
481 * ISA defaults and hope it will work.
482 */
483 if (!mp_irq_entries) {
484 struct mpc_bus bus;
485
486 pr_err("BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
487
488 bus.type = MP_BUS;
489 bus.busid = 0;
490 memcpy(bus.bustype, "ISA ", 6);
491 MP_bus_info(&bus);
492
493 construct_default_ioirq_mptable(0);
494 }
495#endif
496
497 return 0;
498}
499
500/*
501 * Scan the memory blocks for an SMP configuration block.
502 */
503void __init default_get_smp_config(unsigned int early)
504{
505 struct mpf_intel *mpf;
506
507 if (!smp_found_config)
508 return;
509
510 if (!mpf_found)
511 return;
512
513 if (acpi_lapic && early)
514 return;
515
516 /*
517 * MPS doesn't support hyperthreading, aka only have
518 * thread 0 apic id in MPS table
519 */
520 if (acpi_lapic && acpi_ioapic)
521 return;
522
523 mpf = early_memremap(mpf_base, sizeof(*mpf));
524 if (!mpf) {
525 pr_err("MPTABLE: error mapping MP table\n");
526 return;
527 }
528
529 pr_info("Intel MultiProcessor Specification v1.%d\n",
530 mpf->specification);
531#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
532 if (mpf->feature2 & (1 << 7)) {
533 pr_info(" IMCR and PIC compatibility mode.\n");
534 pic_mode = 1;
535 } else {
536 pr_info(" Virtual Wire compatibility mode.\n");
537 pic_mode = 0;
538 }
539#endif
540 /*
541 * Now see if we need to read further.
542 */
543 if (mpf->feature1) {
544 if (early) {
545 /*
546 * local APIC has default address
547 */
548 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
549 goto out;
550 }
551
552 pr_info("Default MP configuration #%d\n", mpf->feature1);
553 construct_default_ISA_mptable(mpf->feature1);
554
555 } else if (mpf->physptr) {
556 if (check_physptr(mpf, early))
557 goto out;
558 } else
559 BUG();
560
561 if (!early)
562 pr_info("Processors: %d\n", num_processors);
563 /*
564 * Only use the first configuration found.
565 */
566out:
567 early_memunmap(mpf, sizeof(*mpf));
568}
569
570static void __init smp_reserve_memory(struct mpf_intel *mpf)
571{
572 memblock_reserve(mpf->physptr, get_mpc_size(mpf->physptr));
573}
574
575static int __init smp_scan_config(unsigned long base, unsigned long length)
576{
577 unsigned int *bp;
578 struct mpf_intel *mpf;
579 int ret = 0;
580
581 apic_printk(APIC_VERBOSE, "Scan for SMP in [mem %#010lx-%#010lx]\n",
582 base, base + length - 1);
583 BUILD_BUG_ON(sizeof(*mpf) != 16);
584
585 while (length > 0) {
586 bp = early_memremap(base, length);
587 mpf = (struct mpf_intel *)bp;
588 if ((*bp == SMP_MAGIC_IDENT) &&
589 (mpf->length == 1) &&
590 !mpf_checksum((unsigned char *)bp, 16) &&
591 ((mpf->specification == 1)
592 || (mpf->specification == 4))) {
593#ifdef CONFIG_X86_LOCAL_APIC
594 smp_found_config = 1;
595#endif
596 mpf_base = base;
597 mpf_found = true;
598
599 pr_info("found SMP MP-table at [mem %#010lx-%#010lx]\n",
600 base, base + sizeof(*mpf) - 1);
601
602 memblock_reserve(base, sizeof(*mpf));
603 if (mpf->physptr)
604 smp_reserve_memory(mpf);
605
606 ret = 1;
607 }
608 early_memunmap(bp, length);
609
610 if (ret)
611 break;
612
613 base += 16;
614 length -= 16;
615 }
616 return ret;
617}
618
619void __init default_find_smp_config(void)
620{
621 unsigned int address;
622
623 /*
624 * FIXME: Linux assumes you have 640K of base ram..
625 * this continues the error...
626 *
627 * 1) Scan the bottom 1K for a signature
628 * 2) Scan the top 1K of base RAM
629 * 3) Scan the 64K of bios
630 */
631 if (smp_scan_config(0x0, 0x400) ||
632 smp_scan_config(639 * 0x400, 0x400) ||
633 smp_scan_config(0xF0000, 0x10000))
634 return;
635 /*
636 * If it is an SMP machine we should know now, unless the
637 * configuration is in an EISA bus machine with an
638 * extended bios data area.
639 *
640 * there is a real-mode segmented pointer pointing to the
641 * 4K EBDA area at 0x40E, calculate and scan it here.
642 *
643 * NOTE! There are Linux loaders that will corrupt the EBDA
644 * area, and as such this kind of SMP config may be less
645 * trustworthy, simply because the SMP table may have been
646 * stomped on during early boot. These loaders are buggy and
647 * should be fixed.
648 *
649 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
650 */
651
652 address = get_bios_ebda();
653 if (address)
654 smp_scan_config(address, 0x400);
655}
656
657#ifdef CONFIG_X86_IO_APIC
658static u8 __initdata irq_used[MAX_IRQ_SOURCES];
659
660static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
661{
662 int i;
663
664 if (m->irqtype != mp_INT)
665 return 0;
666
667 if (m->irqflag != (MP_IRQTRIG_LEVEL | MP_IRQPOL_ACTIVE_LOW))
668 return 0;
669
670 /* not legacy */
671
672 for (i = 0; i < mp_irq_entries; i++) {
673 if (mp_irqs[i].irqtype != mp_INT)
674 continue;
675
676 if (mp_irqs[i].irqflag != (MP_IRQTRIG_LEVEL |
677 MP_IRQPOL_ACTIVE_LOW))
678 continue;
679
680 if (mp_irqs[i].srcbus != m->srcbus)
681 continue;
682 if (mp_irqs[i].srcbusirq != m->srcbusirq)
683 continue;
684 if (irq_used[i]) {
685 /* already claimed */
686 return -2;
687 }
688 irq_used[i] = 1;
689 return i;
690 }
691
692 /* not found */
693 return -1;
694}
695
696#define SPARE_SLOT_NUM 20
697
698static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
699
700static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
701{
702 int i;
703
704 apic_printk(APIC_VERBOSE, "OLD ");
705 print_mp_irq_info(m);
706
707 i = get_MP_intsrc_index(m);
708 if (i > 0) {
709 memcpy(m, &mp_irqs[i], sizeof(*m));
710 apic_printk(APIC_VERBOSE, "NEW ");
711 print_mp_irq_info(&mp_irqs[i]);
712 return;
713 }
714 if (!i) {
715 /* legacy, do nothing */
716 return;
717 }
718 if (*nr_m_spare < SPARE_SLOT_NUM) {
719 /*
720 * not found (-1), or duplicated (-2) are invalid entries,
721 * we need to use the slot later
722 */
723 m_spare[*nr_m_spare] = m;
724 *nr_m_spare += 1;
725 }
726}
727
728static int __init
729check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
730{
731 if (!mpc_new_phys || count <= mpc_new_length) {
732 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
733 return -1;
734 }
735
736 return 0;
737}
738#else /* CONFIG_X86_IO_APIC */
739static
740inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
741#endif /* CONFIG_X86_IO_APIC */
742
743static int __init replace_intsrc_all(struct mpc_table *mpc,
744 unsigned long mpc_new_phys,
745 unsigned long mpc_new_length)
746{
747#ifdef CONFIG_X86_IO_APIC
748 int i;
749#endif
750 int count = sizeof(*mpc);
751 int nr_m_spare = 0;
752 unsigned char *mpt = ((unsigned char *)mpc) + count;
753
754 pr_info("mpc_length %x\n", mpc->length);
755 while (count < mpc->length) {
756 switch (*mpt) {
757 case MP_PROCESSOR:
758 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
759 break;
760 case MP_BUS:
761 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
762 break;
763 case MP_IOAPIC:
764 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
765 break;
766 case MP_INTSRC:
767 check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
768 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
769 break;
770 case MP_LINTSRC:
771 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
772 break;
773 default:
774 /* wrong mptable */
775 smp_dump_mptable(mpc, mpt);
776 goto out;
777 }
778 }
779
780#ifdef CONFIG_X86_IO_APIC
781 for (i = 0; i < mp_irq_entries; i++) {
782 if (irq_used[i])
783 continue;
784
785 if (mp_irqs[i].irqtype != mp_INT)
786 continue;
787
788 if (mp_irqs[i].irqflag != (MP_IRQTRIG_LEVEL |
789 MP_IRQPOL_ACTIVE_LOW))
790 continue;
791
792 if (nr_m_spare > 0) {
793 apic_printk(APIC_VERBOSE, "*NEW* found\n");
794 nr_m_spare--;
795 memcpy(m_spare[nr_m_spare], &mp_irqs[i], sizeof(mp_irqs[i]));
796 m_spare[nr_m_spare] = NULL;
797 } else {
798 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
799 count += sizeof(struct mpc_intsrc);
800 if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
801 goto out;
802 memcpy(m, &mp_irqs[i], sizeof(*m));
803 mpc->length = count;
804 mpt += sizeof(struct mpc_intsrc);
805 }
806 print_mp_irq_info(&mp_irqs[i]);
807 }
808#endif
809out:
810 /* update checksum */
811 mpc->checksum = 0;
812 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
813
814 return 0;
815}
816
817int enable_update_mptable;
818
819static int __init update_mptable_setup(char *str)
820{
821 enable_update_mptable = 1;
822#ifdef CONFIG_PCI
823 pci_routeirq = 1;
824#endif
825 return 0;
826}
827early_param("update_mptable", update_mptable_setup);
828
829static unsigned long __initdata mpc_new_phys;
830static unsigned long mpc_new_length __initdata = 4096;
831
832/* alloc_mptable or alloc_mptable=4k */
833static int __initdata alloc_mptable;
834static int __init parse_alloc_mptable_opt(char *p)
835{
836 enable_update_mptable = 1;
837#ifdef CONFIG_PCI
838 pci_routeirq = 1;
839#endif
840 alloc_mptable = 1;
841 if (!p)
842 return 0;
843 mpc_new_length = memparse(p, &p);
844 return 0;
845}
846early_param("alloc_mptable", parse_alloc_mptable_opt);
847
848void __init e820__memblock_alloc_reserved_mpc_new(void)
849{
850 if (enable_update_mptable && alloc_mptable)
851 mpc_new_phys = e820__memblock_alloc_reserved(mpc_new_length, 4);
852}
853
854static int __init update_mp_table(void)
855{
856 char str[16];
857 char oem[10];
858 struct mpf_intel *mpf;
859 struct mpc_table *mpc, *mpc_new;
860 unsigned long size;
861
862 if (!enable_update_mptable)
863 return 0;
864
865 if (!mpf_found)
866 return 0;
867
868 mpf = early_memremap(mpf_base, sizeof(*mpf));
869 if (!mpf) {
870 pr_err("MPTABLE: mpf early_memremap() failed\n");
871 return 0;
872 }
873
874 /*
875 * Now see if we need to go further.
876 */
877 if (mpf->feature1)
878 goto do_unmap_mpf;
879
880 if (!mpf->physptr)
881 goto do_unmap_mpf;
882
883 size = get_mpc_size(mpf->physptr);
884 mpc = early_memremap(mpf->physptr, size);
885 if (!mpc) {
886 pr_err("MPTABLE: mpc early_memremap() failed\n");
887 goto do_unmap_mpf;
888 }
889
890 if (!smp_check_mpc(mpc, oem, str))
891 goto do_unmap_mpc;
892
893 pr_info("mpf: %llx\n", (u64)mpf_base);
894 pr_info("physptr: %x\n", mpf->physptr);
895
896 if (mpc_new_phys && mpc->length > mpc_new_length) {
897 mpc_new_phys = 0;
898 pr_info("mpc_new_length is %ld, please use alloc_mptable=8k\n",
899 mpc_new_length);
900 }
901
902 if (!mpc_new_phys) {
903 unsigned char old, new;
904 /* check if we can change the position */
905 mpc->checksum = 0;
906 old = mpf_checksum((unsigned char *)mpc, mpc->length);
907 mpc->checksum = 0xff;
908 new = mpf_checksum((unsigned char *)mpc, mpc->length);
909 if (old == new) {
910 pr_info("mpc is readonly, please try alloc_mptable instead\n");
911 goto do_unmap_mpc;
912 }
913 pr_info("use in-position replacing\n");
914 } else {
915 mpc_new = early_memremap(mpc_new_phys, mpc_new_length);
916 if (!mpc_new) {
917 pr_err("MPTABLE: new mpc early_memremap() failed\n");
918 goto do_unmap_mpc;
919 }
920 mpf->physptr = mpc_new_phys;
921 memcpy(mpc_new, mpc, mpc->length);
922 early_memunmap(mpc, size);
923 mpc = mpc_new;
924 size = mpc_new_length;
925 /* check if we can modify that */
926 if (mpc_new_phys - mpf->physptr) {
927 struct mpf_intel *mpf_new;
928 /* steal 16 bytes from [0, 1k) */
929 mpf_new = early_memremap(0x400 - 16, sizeof(*mpf_new));
930 if (!mpf_new) {
931 pr_err("MPTABLE: new mpf early_memremap() failed\n");
932 goto do_unmap_mpc;
933 }
934 pr_info("mpf new: %x\n", 0x400 - 16);
935 memcpy(mpf_new, mpf, 16);
936 early_memunmap(mpf, sizeof(*mpf));
937 mpf = mpf_new;
938 mpf->physptr = mpc_new_phys;
939 }
940 mpf->checksum = 0;
941 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
942 pr_info("physptr new: %x\n", mpf->physptr);
943 }
944
945 /*
946 * only replace the one with mp_INT and
947 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
948 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
949 * may need pci=routeirq for all coverage
950 */
951 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
952
953do_unmap_mpc:
954 early_memunmap(mpc, size);
955
956do_unmap_mpf:
957 early_memunmap(mpf, sizeof(*mpf));
958
959 return 0;
960}
961
962late_initcall(update_mp_table);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel Multiprocessor Specification 1.1 and 1.4
4 * compliant MP-table parsing routines.
5 *
6 * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
7 * (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com>
8 * (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
9 */
10
11#include <linux/mm.h>
12#include <linux/init.h>
13#include <linux/delay.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/smp.h>
20#include <linux/pci.h>
21
22#include <asm/i8259.h>
23#include <asm/io_apic.h>
24#include <asm/acpi.h>
25#include <asm/irqdomain.h>
26#include <asm/mtrr.h>
27#include <asm/mpspec.h>
28#include <asm/proto.h>
29#include <asm/bios_ebda.h>
30#include <asm/e820/api.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
39static 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
49static void __init MP_processor_info(struct mpc_cpu *m)
50{
51 char *bootup_cpu = "";
52
53 if (!(m->cpuflag & CPU_ENABLED)) {
54 disabled_cpus++;
55 return;
56 }
57
58 if (m->cpuflag & CPU_BOOTPROCESSOR)
59 bootup_cpu = " (Bootup-CPU)";
60
61 pr_info("Processor #%d%s\n", m->apicid, bootup_cpu);
62 generic_processor_info(m->apicid);
63}
64
65#ifdef CONFIG_X86_IO_APIC
66static void __init mpc_oem_bus_info(struct mpc_bus *m, char *str)
67{
68 memcpy(str, m->bustype, 6);
69 str[6] = 0;
70 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
71}
72
73static void __init MP_bus_info(struct mpc_bus *m)
74{
75 char str[7];
76
77 mpc_oem_bus_info(m, str);
78
79#if MAX_MP_BUSSES < 256
80 if (m->busid >= MAX_MP_BUSSES) {
81 pr_warn("MP table busid value (%d) for bustype %s is too large, max. supported is %d\n",
82 m->busid, str, MAX_MP_BUSSES - 1);
83 return;
84 }
85#endif
86
87 set_bit(m->busid, mp_bus_not_pci);
88 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
89#ifdef CONFIG_EISA
90 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
91#endif
92 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
93 clear_bit(m->busid, mp_bus_not_pci);
94#ifdef CONFIG_EISA
95 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
96 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
97 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
98#endif
99 } else
100 pr_warn("Unknown bustype %s - ignoring\n", str);
101}
102
103static void __init MP_ioapic_info(struct mpc_ioapic *m)
104{
105 struct ioapic_domain_cfg cfg = {
106 .type = IOAPIC_DOMAIN_LEGACY,
107 .ops = &mp_ioapic_irqdomain_ops,
108 };
109
110 if (m->flags & MPC_APIC_USABLE)
111 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top, &cfg);
112}
113
114static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
115{
116 apic_printk(APIC_VERBOSE,
117 "Int: type %d, pol %d, trig %d, bus %02x, IRQ %02x, APIC ID %x, APIC INT %02x\n",
118 mp_irq->irqtype, mp_irq->irqflag & 3,
119 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
120 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
121}
122
123#else /* CONFIG_X86_IO_APIC */
124static inline void __init MP_bus_info(struct mpc_bus *m) {}
125static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
126#endif /* CONFIG_X86_IO_APIC */
127
128static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
129{
130 apic_printk(APIC_VERBOSE,
131 "Lint: type %d, pol %d, trig %d, bus %02x, IRQ %02x, APIC ID %x, APIC LINT %02x\n",
132 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
133 m->srcbusirq, m->destapic, m->destapiclint);
134}
135
136/*
137 * Read/parse the MPC
138 */
139static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
140{
141
142 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
143 pr_err("MPTABLE: bad signature [%c%c%c%c]!\n",
144 mpc->signature[0], mpc->signature[1],
145 mpc->signature[2], mpc->signature[3]);
146 return 0;
147 }
148 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
149 pr_err("MPTABLE: checksum error!\n");
150 return 0;
151 }
152 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
153 pr_err("MPTABLE: bad table version (%d)!!\n", mpc->spec);
154 return 0;
155 }
156 if (!mpc->lapic) {
157 pr_err("MPTABLE: null local APIC address!\n");
158 return 0;
159 }
160 memcpy(oem, mpc->oem, 8);
161 oem[8] = 0;
162 pr_info("MPTABLE: OEM ID: %s\n", oem);
163
164 memcpy(str, mpc->productid, 12);
165 str[12] = 0;
166
167 pr_info("MPTABLE: Product ID: %s\n", str);
168
169 pr_info("MPTABLE: APIC at: 0x%X\n", mpc->lapic);
170
171 return 1;
172}
173
174static void skip_entry(unsigned char **ptr, int *count, int size)
175{
176 *ptr += size;
177 *count += size;
178}
179
180static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
181{
182 pr_err("Your mptable is wrong, contact your HW vendor!\n");
183 pr_cont("type %x\n", *mpt);
184 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
185 1, mpc, mpc->length, 1);
186}
187
188static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
189{
190 char str[16];
191 char oem[10];
192
193 int count = sizeof(*mpc);
194 unsigned char *mpt = ((unsigned char *)mpc) + count;
195
196 if (!smp_check_mpc(mpc, oem, str))
197 return 0;
198
199 /* Initialize the lapic mapping */
200 if (!acpi_lapic)
201 register_lapic_address(mpc->lapic);
202
203 if (early)
204 return 1;
205
206 /* Now process the configuration blocks. */
207 while (count < mpc->length) {
208 switch (*mpt) {
209 case MP_PROCESSOR:
210 /* ACPI may have already provided this data */
211 if (!acpi_lapic)
212 MP_processor_info((struct mpc_cpu *)mpt);
213 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
214 break;
215 case MP_BUS:
216 MP_bus_info((struct mpc_bus *)mpt);
217 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
218 break;
219 case MP_IOAPIC:
220 MP_ioapic_info((struct mpc_ioapic *)mpt);
221 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
222 break;
223 case MP_INTSRC:
224 mp_save_irq((struct mpc_intsrc *)mpt);
225 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
226 break;
227 case MP_LINTSRC:
228 MP_lintsrc_info((struct mpc_lintsrc *)mpt);
229 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
230 break;
231 default:
232 /* wrong mptable */
233 smp_dump_mptable(mpc, mpt);
234 count = mpc->length;
235 break;
236 }
237 }
238
239 if (!num_processors)
240 pr_err("MPTABLE: no processors registered!\n");
241 return num_processors;
242}
243
244#ifdef CONFIG_X86_IO_APIC
245
246static int __init ELCR_trigger(unsigned int irq)
247{
248 unsigned int port;
249
250 port = PIC_ELCR1 + (irq >> 3);
251 return (inb(port) >> (irq & 7)) & 1;
252}
253
254static void __init construct_default_ioirq_mptable(int mpc_default_type)
255{
256 struct mpc_intsrc intsrc;
257 int i;
258 int ELCR_fallback = 0;
259
260 intsrc.type = MP_INTSRC;
261 intsrc.irqflag = MP_IRQTRIG_DEFAULT | MP_IRQPOL_DEFAULT;
262 intsrc.srcbus = 0;
263 intsrc.dstapic = mpc_ioapic_id(0);
264
265 intsrc.irqtype = mp_INT;
266
267 /*
268 * If true, we have an ISA/PCI system with no IRQ entries
269 * in the MP table. To prevent the PCI interrupts from being set up
270 * incorrectly, we try to use the ELCR. The sanity check to see if
271 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
272 * never be level sensitive, so we simply see if the ELCR agrees.
273 * If it does, we assume it's valid.
274 */
275 if (mpc_default_type == 5) {
276 pr_info("ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
277
278 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
279 ELCR_trigger(13))
280 pr_err("ELCR contains invalid data... not using ELCR\n");
281 else {
282 pr_info("Using ELCR to identify PCI interrupts\n");
283 ELCR_fallback = 1;
284 }
285 }
286
287 for (i = 0; i < 16; i++) {
288 switch (mpc_default_type) {
289 case 2:
290 if (i == 0 || i == 13)
291 continue; /* IRQ0 & IRQ13 not connected */
292 fallthrough;
293 default:
294 if (i == 2)
295 continue; /* IRQ2 is never connected */
296 }
297
298 if (ELCR_fallback) {
299 /*
300 * If the ELCR indicates a level-sensitive interrupt, we
301 * copy that information over to the MP table in the
302 * irqflag field (level sensitive, active high polarity).
303 */
304 if (ELCR_trigger(i)) {
305 intsrc.irqflag = MP_IRQTRIG_LEVEL |
306 MP_IRQPOL_ACTIVE_HIGH;
307 } else {
308 intsrc.irqflag = MP_IRQTRIG_DEFAULT |
309 MP_IRQPOL_DEFAULT;
310 }
311 }
312
313 intsrc.srcbusirq = i;
314 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
315 mp_save_irq(&intsrc);
316 }
317
318 intsrc.irqtype = mp_ExtINT;
319 intsrc.srcbusirq = 0;
320 intsrc.dstirq = 0; /* 8259A to INTIN0 */
321 mp_save_irq(&intsrc);
322}
323
324
325static void __init construct_ioapic_table(int mpc_default_type)
326{
327 struct mpc_ioapic ioapic;
328 struct mpc_bus bus;
329
330 bus.type = MP_BUS;
331 bus.busid = 0;
332 switch (mpc_default_type) {
333 default:
334 pr_err("???\nUnknown standard configuration %d\n",
335 mpc_default_type);
336 fallthrough;
337 case 1:
338 case 5:
339 memcpy(bus.bustype, "ISA ", 6);
340 break;
341 case 2:
342 case 6:
343 case 3:
344 memcpy(bus.bustype, "EISA ", 6);
345 break;
346 }
347 MP_bus_info(&bus);
348 if (mpc_default_type > 4) {
349 bus.busid = 1;
350 memcpy(bus.bustype, "PCI ", 6);
351 MP_bus_info(&bus);
352 }
353
354 ioapic.type = MP_IOAPIC;
355 ioapic.apicid = 2;
356 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
357 ioapic.flags = MPC_APIC_USABLE;
358 ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
359 MP_ioapic_info(&ioapic);
360
361 /*
362 * We set up most of the low 16 IO-APIC pins according to MPS rules.
363 */
364 construct_default_ioirq_mptable(mpc_default_type);
365}
366#else
367static inline void __init construct_ioapic_table(int mpc_default_type) { }
368#endif
369
370static inline void __init construct_default_ISA_mptable(int mpc_default_type)
371{
372 struct mpc_cpu processor;
373 struct mpc_lintsrc lintsrc;
374 int linttypes[2] = { mp_ExtINT, mp_NMI };
375 int i;
376
377 /*
378 * 2 CPUs, numbered 0 & 1.
379 */
380 processor.type = MP_PROCESSOR;
381 /* Either an integrated APIC or a discrete 82489DX. */
382 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
383 processor.cpuflag = CPU_ENABLED;
384 processor.cpufeature = (boot_cpu_data.x86 << 8) |
385 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_stepping;
386 processor.featureflag = boot_cpu_data.x86_capability[CPUID_1_EDX];
387 processor.reserved[0] = 0;
388 processor.reserved[1] = 0;
389 for (i = 0; i < 2; i++) {
390 processor.apicid = i;
391 MP_processor_info(&processor);
392 }
393
394 construct_ioapic_table(mpc_default_type);
395
396 lintsrc.type = MP_LINTSRC;
397 lintsrc.irqflag = MP_IRQTRIG_DEFAULT | MP_IRQPOL_DEFAULT;
398 lintsrc.srcbusid = 0;
399 lintsrc.srcbusirq = 0;
400 lintsrc.destapic = MP_APIC_ALL;
401 for (i = 0; i < 2; i++) {
402 lintsrc.irqtype = linttypes[i];
403 lintsrc.destapiclint = i;
404 MP_lintsrc_info(&lintsrc);
405 }
406}
407
408static unsigned long mpf_base;
409static bool mpf_found;
410
411static unsigned long __init get_mpc_size(unsigned long physptr)
412{
413 struct mpc_table *mpc;
414 unsigned long size;
415
416 mpc = early_memremap(physptr, PAGE_SIZE);
417 size = mpc->length;
418 early_memunmap(mpc, PAGE_SIZE);
419 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
420
421 return size;
422}
423
424static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
425{
426 struct mpc_table *mpc;
427 unsigned long size;
428
429 size = get_mpc_size(mpf->physptr);
430 mpc = early_memremap(mpf->physptr, size);
431
432 /*
433 * Read the physical hardware table. Anything here will
434 * override the defaults.
435 */
436 if (!smp_read_mpc(mpc, early)) {
437#ifdef CONFIG_X86_LOCAL_APIC
438 smp_found_config = 0;
439#endif
440 pr_err("BIOS bug, MP table errors detected!...\n");
441 pr_cont("... disabling SMP support. (tell your hw vendor)\n");
442 early_memunmap(mpc, size);
443 return -1;
444 }
445 early_memunmap(mpc, size);
446
447 if (early)
448 return -1;
449
450#ifdef CONFIG_X86_IO_APIC
451 /*
452 * If there are no explicit MP IRQ entries, then we are
453 * broken. We set up most of the low 16 IO-APIC pins to
454 * ISA defaults and hope it will work.
455 */
456 if (!mp_irq_entries) {
457 struct mpc_bus bus;
458
459 pr_err("BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
460
461 bus.type = MP_BUS;
462 bus.busid = 0;
463 memcpy(bus.bustype, "ISA ", 6);
464 MP_bus_info(&bus);
465
466 construct_default_ioirq_mptable(0);
467 }
468#endif
469
470 return 0;
471}
472
473/*
474 * Scan the memory blocks for an SMP configuration block.
475 */
476void __init default_get_smp_config(unsigned int early)
477{
478 struct mpf_intel *mpf;
479
480 if (!smp_found_config)
481 return;
482
483 if (!mpf_found)
484 return;
485
486 if (acpi_lapic && early)
487 return;
488
489 /*
490 * MPS doesn't support hyperthreading, aka only have
491 * thread 0 apic id in MPS table
492 */
493 if (acpi_lapic && acpi_ioapic)
494 return;
495
496 mpf = early_memremap(mpf_base, sizeof(*mpf));
497 if (!mpf) {
498 pr_err("MPTABLE: error mapping MP table\n");
499 return;
500 }
501
502 pr_info("Intel MultiProcessor Specification v1.%d\n",
503 mpf->specification);
504#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
505 if (mpf->feature2 & (1 << 7)) {
506 pr_info(" IMCR and PIC compatibility mode.\n");
507 pic_mode = 1;
508 } else {
509 pr_info(" Virtual Wire compatibility mode.\n");
510 pic_mode = 0;
511 }
512#endif
513 /*
514 * Now see if we need to read further.
515 */
516 if (mpf->feature1) {
517 if (early) {
518 /* Local APIC has default address */
519 register_lapic_address(APIC_DEFAULT_PHYS_BASE);
520 goto out;
521 }
522
523 pr_info("Default MP configuration #%d\n", mpf->feature1);
524 construct_default_ISA_mptable(mpf->feature1);
525
526 } else if (mpf->physptr) {
527 if (check_physptr(mpf, early))
528 goto out;
529 } else
530 BUG();
531
532 if (!early)
533 pr_info("Processors: %d\n", num_processors);
534 /*
535 * Only use the first configuration found.
536 */
537out:
538 early_memunmap(mpf, sizeof(*mpf));
539}
540
541static void __init smp_reserve_memory(struct mpf_intel *mpf)
542{
543 memblock_reserve(mpf->physptr, get_mpc_size(mpf->physptr));
544}
545
546static int __init smp_scan_config(unsigned long base, unsigned long length)
547{
548 unsigned int *bp;
549 struct mpf_intel *mpf;
550 int ret = 0;
551
552 apic_printk(APIC_VERBOSE, "Scan for SMP in [mem %#010lx-%#010lx]\n",
553 base, base + length - 1);
554 BUILD_BUG_ON(sizeof(*mpf) != 16);
555
556 while (length > 0) {
557 bp = early_memremap(base, length);
558 mpf = (struct mpf_intel *)bp;
559 if ((*bp == SMP_MAGIC_IDENT) &&
560 (mpf->length == 1) &&
561 !mpf_checksum((unsigned char *)bp, 16) &&
562 ((mpf->specification == 1)
563 || (mpf->specification == 4))) {
564#ifdef CONFIG_X86_LOCAL_APIC
565 smp_found_config = 1;
566#endif
567 mpf_base = base;
568 mpf_found = true;
569
570 pr_info("found SMP MP-table at [mem %#010lx-%#010lx]\n",
571 base, base + sizeof(*mpf) - 1);
572
573 memblock_reserve(base, sizeof(*mpf));
574 if (mpf->physptr)
575 smp_reserve_memory(mpf);
576
577 ret = 1;
578 }
579 early_memunmap(bp, length);
580
581 if (ret)
582 break;
583
584 base += 16;
585 length -= 16;
586 }
587 return ret;
588}
589
590void __init default_find_smp_config(void)
591{
592 unsigned int address;
593
594 /*
595 * FIXME: Linux assumes you have 640K of base ram..
596 * this continues the error...
597 *
598 * 1) Scan the bottom 1K for a signature
599 * 2) Scan the top 1K of base RAM
600 * 3) Scan the 64K of bios
601 */
602 if (smp_scan_config(0x0, 0x400) ||
603 smp_scan_config(639 * 0x400, 0x400) ||
604 smp_scan_config(0xF0000, 0x10000))
605 return;
606 /*
607 * If it is an SMP machine we should know now, unless the
608 * configuration is in an EISA bus machine with an
609 * extended bios data area.
610 *
611 * there is a real-mode segmented pointer pointing to the
612 * 4K EBDA area at 0x40E, calculate and scan it here.
613 *
614 * NOTE! There are Linux loaders that will corrupt the EBDA
615 * area, and as such this kind of SMP config may be less
616 * trustworthy, simply because the SMP table may have been
617 * stomped on during early boot. These loaders are buggy and
618 * should be fixed.
619 *
620 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
621 */
622
623 address = get_bios_ebda();
624 if (address)
625 smp_scan_config(address, 0x400);
626}
627
628#ifdef CONFIG_X86_IO_APIC
629static u8 __initdata irq_used[MAX_IRQ_SOURCES];
630
631static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
632{
633 int i;
634
635 if (m->irqtype != mp_INT)
636 return 0;
637
638 if (m->irqflag != (MP_IRQTRIG_LEVEL | MP_IRQPOL_ACTIVE_LOW))
639 return 0;
640
641 /* not legacy */
642
643 for (i = 0; i < mp_irq_entries; i++) {
644 if (mp_irqs[i].irqtype != mp_INT)
645 continue;
646
647 if (mp_irqs[i].irqflag != (MP_IRQTRIG_LEVEL |
648 MP_IRQPOL_ACTIVE_LOW))
649 continue;
650
651 if (mp_irqs[i].srcbus != m->srcbus)
652 continue;
653 if (mp_irqs[i].srcbusirq != m->srcbusirq)
654 continue;
655 if (irq_used[i]) {
656 /* already claimed */
657 return -2;
658 }
659 irq_used[i] = 1;
660 return i;
661 }
662
663 /* not found */
664 return -1;
665}
666
667#define SPARE_SLOT_NUM 20
668
669static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
670
671static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
672{
673 int i;
674
675 apic_printk(APIC_VERBOSE, "OLD ");
676 print_mp_irq_info(m);
677
678 i = get_MP_intsrc_index(m);
679 if (i > 0) {
680 memcpy(m, &mp_irqs[i], sizeof(*m));
681 apic_printk(APIC_VERBOSE, "NEW ");
682 print_mp_irq_info(&mp_irqs[i]);
683 return;
684 }
685 if (!i) {
686 /* legacy, do nothing */
687 return;
688 }
689 if (*nr_m_spare < SPARE_SLOT_NUM) {
690 /*
691 * not found (-1), or duplicated (-2) are invalid entries,
692 * we need to use the slot later
693 */
694 m_spare[*nr_m_spare] = m;
695 *nr_m_spare += 1;
696 }
697}
698
699static int __init
700check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
701{
702 if (!mpc_new_phys || count <= mpc_new_length) {
703 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
704 return -1;
705 }
706
707 return 0;
708}
709#else /* CONFIG_X86_IO_APIC */
710static
711inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
712#endif /* CONFIG_X86_IO_APIC */
713
714static int __init replace_intsrc_all(struct mpc_table *mpc,
715 unsigned long mpc_new_phys,
716 unsigned long mpc_new_length)
717{
718#ifdef CONFIG_X86_IO_APIC
719 int i;
720#endif
721 int count = sizeof(*mpc);
722 int nr_m_spare = 0;
723 unsigned char *mpt = ((unsigned char *)mpc) + count;
724
725 pr_info("mpc_length %x\n", mpc->length);
726 while (count < mpc->length) {
727 switch (*mpt) {
728 case MP_PROCESSOR:
729 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
730 break;
731 case MP_BUS:
732 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
733 break;
734 case MP_IOAPIC:
735 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
736 break;
737 case MP_INTSRC:
738 check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
739 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
740 break;
741 case MP_LINTSRC:
742 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
743 break;
744 default:
745 /* wrong mptable */
746 smp_dump_mptable(mpc, mpt);
747 goto out;
748 }
749 }
750
751#ifdef CONFIG_X86_IO_APIC
752 for (i = 0; i < mp_irq_entries; i++) {
753 if (irq_used[i])
754 continue;
755
756 if (mp_irqs[i].irqtype != mp_INT)
757 continue;
758
759 if (mp_irqs[i].irqflag != (MP_IRQTRIG_LEVEL |
760 MP_IRQPOL_ACTIVE_LOW))
761 continue;
762
763 if (nr_m_spare > 0) {
764 apic_printk(APIC_VERBOSE, "*NEW* found\n");
765 nr_m_spare--;
766 memcpy(m_spare[nr_m_spare], &mp_irqs[i], sizeof(mp_irqs[i]));
767 m_spare[nr_m_spare] = NULL;
768 } else {
769 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
770 count += sizeof(struct mpc_intsrc);
771 if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
772 goto out;
773 memcpy(m, &mp_irqs[i], sizeof(*m));
774 mpc->length = count;
775 mpt += sizeof(struct mpc_intsrc);
776 }
777 print_mp_irq_info(&mp_irqs[i]);
778 }
779#endif
780out:
781 /* update checksum */
782 mpc->checksum = 0;
783 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
784
785 return 0;
786}
787
788int enable_update_mptable;
789
790static int __init update_mptable_setup(char *str)
791{
792 enable_update_mptable = 1;
793#ifdef CONFIG_PCI
794 pci_routeirq = 1;
795#endif
796 return 0;
797}
798early_param("update_mptable", update_mptable_setup);
799
800static unsigned long __initdata mpc_new_phys;
801static unsigned long mpc_new_length __initdata = 4096;
802
803/* alloc_mptable or alloc_mptable=4k */
804static int __initdata alloc_mptable;
805static int __init parse_alloc_mptable_opt(char *p)
806{
807 enable_update_mptable = 1;
808#ifdef CONFIG_PCI
809 pci_routeirq = 1;
810#endif
811 alloc_mptable = 1;
812 if (!p)
813 return 0;
814 mpc_new_length = memparse(p, &p);
815 return 0;
816}
817early_param("alloc_mptable", parse_alloc_mptable_opt);
818
819void __init e820__memblock_alloc_reserved_mpc_new(void)
820{
821 if (enable_update_mptable && alloc_mptable)
822 mpc_new_phys = e820__memblock_alloc_reserved(mpc_new_length, 4);
823}
824
825static int __init update_mp_table(void)
826{
827 char str[16];
828 char oem[10];
829 struct mpf_intel *mpf;
830 struct mpc_table *mpc, *mpc_new;
831 unsigned long size;
832
833 if (!enable_update_mptable)
834 return 0;
835
836 if (!mpf_found)
837 return 0;
838
839 mpf = early_memremap(mpf_base, sizeof(*mpf));
840 if (!mpf) {
841 pr_err("MPTABLE: mpf early_memremap() failed\n");
842 return 0;
843 }
844
845 /*
846 * Now see if we need to go further.
847 */
848 if (mpf->feature1)
849 goto do_unmap_mpf;
850
851 if (!mpf->physptr)
852 goto do_unmap_mpf;
853
854 size = get_mpc_size(mpf->physptr);
855 mpc = early_memremap(mpf->physptr, size);
856 if (!mpc) {
857 pr_err("MPTABLE: mpc early_memremap() failed\n");
858 goto do_unmap_mpf;
859 }
860
861 if (!smp_check_mpc(mpc, oem, str))
862 goto do_unmap_mpc;
863
864 pr_info("mpf: %llx\n", (u64)mpf_base);
865 pr_info("physptr: %x\n", mpf->physptr);
866
867 if (mpc_new_phys && mpc->length > mpc_new_length) {
868 mpc_new_phys = 0;
869 pr_info("mpc_new_length is %ld, please use alloc_mptable=8k\n",
870 mpc_new_length);
871 }
872
873 if (!mpc_new_phys) {
874 unsigned char old, new;
875 /* check if we can change the position */
876 mpc->checksum = 0;
877 old = mpf_checksum((unsigned char *)mpc, mpc->length);
878 mpc->checksum = 0xff;
879 new = mpf_checksum((unsigned char *)mpc, mpc->length);
880 if (old == new) {
881 pr_info("mpc is readonly, please try alloc_mptable instead\n");
882 goto do_unmap_mpc;
883 }
884 pr_info("use in-position replacing\n");
885 } else {
886 mpc_new = early_memremap(mpc_new_phys, mpc_new_length);
887 if (!mpc_new) {
888 pr_err("MPTABLE: new mpc early_memremap() failed\n");
889 goto do_unmap_mpc;
890 }
891 mpf->physptr = mpc_new_phys;
892 memcpy(mpc_new, mpc, mpc->length);
893 early_memunmap(mpc, size);
894 mpc = mpc_new;
895 size = mpc_new_length;
896 /* check if we can modify that */
897 if (mpc_new_phys - mpf->physptr) {
898 struct mpf_intel *mpf_new;
899 /* steal 16 bytes from [0, 1k) */
900 mpf_new = early_memremap(0x400 - 16, sizeof(*mpf_new));
901 if (!mpf_new) {
902 pr_err("MPTABLE: new mpf early_memremap() failed\n");
903 goto do_unmap_mpc;
904 }
905 pr_info("mpf new: %x\n", 0x400 - 16);
906 memcpy(mpf_new, mpf, 16);
907 early_memunmap(mpf, sizeof(*mpf));
908 mpf = mpf_new;
909 mpf->physptr = mpc_new_phys;
910 }
911 mpf->checksum = 0;
912 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
913 pr_info("physptr new: %x\n", mpf->physptr);
914 }
915
916 /*
917 * only replace the one with mp_INT and
918 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
919 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
920 * may need pci=routeirq for all coverage
921 */
922 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
923
924do_unmap_mpc:
925 early_memunmap(mpc, size);
926
927do_unmap_mpf:
928 early_memunmap(mpf, sizeof(*mpf));
929
930 return 0;
931}
932
933late_initcall(update_mp_table);