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831097f2022a29ad610e42f5e468f299952cf37d
[deliverable/linux.git] / arch / x86 / kernel / mpparse_64.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 *
8 * Fixes
9 * Erich Boleyn : MP v1.4 and additional changes.
10 * Alan Cox : Added EBDA scanning
11 * Ingo Molnar : various cleanups and rewrites
12 * Maciej W. Rozycki: Bits for default MP configurations
13 * Paul Diefenbaugh: Added full ACPI support
14 */
15
16 #include <linux/mm.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19 #include <linux/bootmem.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/mc146818rtc.h>
22 #include <linux/acpi.h>
23 #include <linux/module.h>
24
25 #include <asm/smp.h>
26 #include <asm/mtrr.h>
27 #include <asm/mpspec.h>
28 #include <asm/pgalloc.h>
29 #include <asm/io_apic.h>
30 #include <asm/proto.h>
31 #include <asm/acpi.h>
32 #include <asm/bios_ebda.h>
33
34 #include <mach_apic.h>
35
36 /* Have we found an MP table */
37 int smp_found_config;
38
39 /*
40 * Various Linux-internal data structures created from the
41 * MP-table.
42 */
43 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
44 int mp_bus_id_to_pci_bus[MAX_MP_BUSSES] = {[0 ... MAX_MP_BUSSES - 1] = -1 };
45
46 static int mp_current_pci_id = 0;
47
48 /*
49 * Intel MP BIOS table parsing routines:
50 */
51
52 /*
53 * Checksum an MP configuration block.
54 */
55
56 static int __init mpf_checksum(unsigned char *mp, int len)
57 {
58 int sum = 0;
59
60 while (len--)
61 sum += *mp++;
62
63 return sum & 0xFF;
64 }
65
66 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
67 {
68 int apicid;
69 char *bootup_cpu = "";
70
71 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
72 disabled_cpus++;
73 return;
74 }
75 #ifdef CONFIG_X86_NUMAQ
76 apicid = mpc_apic_id(m, translation_table[mpc_record]);
77 #else
78 apicid = m->mpc_apicid;
79 #endif
80 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
81 bootup_cpu = " (Bootup-CPU)";
82 boot_cpu_physical_apicid = m->mpc_apicid;
83 }
84
85 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
86 generic_processor_info(apicid, m->mpc_apicver);
87 }
88
89 static void __init MP_bus_info(struct mpc_config_bus *m)
90 {
91 char str[7];
92
93 memcpy(str, m->mpc_bustype, 6);
94 str[6] = 0;
95
96 #ifdef CONFIG_X86_NUMAQ
97 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
98 #else
99 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
100 #endif
101
102 #if MAX_MP_BUSSES < 256
103 if (m->mpc_busid >= MAX_MP_BUSSES) {
104 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
105 " is too large, max. supported is %d\n",
106 m->mpc_busid, str, MAX_MP_BUSSES - 1);
107 return;
108 }
109 #endif
110
111 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
112 set_bit(m->mpc_busid, mp_bus_not_pci);
113 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
114 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
115 #endif
116 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
117 #ifdef CONFIG_X86_NUMAQ
118 mpc_oem_pci_bus(m, translation_table[mpc_record]);
119 #endif
120 clear_bit(m->mpc_busid, mp_bus_not_pci);
121 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
122 mp_current_pci_id++;
123 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
124 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
125 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
126 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
127 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
128 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
129 #endif
130 } else
131 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
132 }
133
134 static int bad_ioapic(unsigned long address)
135 {
136 if (nr_ioapics >= MAX_IO_APICS) {
137 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
138 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
139 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
140 }
141 if (!address) {
142 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
143 " found in table, skipping!\n");
144 return 1;
145 }
146 return 0;
147 }
148
149 static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
150 {
151 if (!(m->mpc_flags & MPC_APIC_USABLE))
152 return;
153
154 printk(KERN_INFO "I/O APIC #%d at 0x%X.\n", m->mpc_apicid,
155 m->mpc_apicaddr);
156
157 if (bad_ioapic(m->mpc_apicaddr))
158 return;
159
160 mp_ioapics[nr_ioapics] = *m;
161 nr_ioapics++;
162 }
163
164 static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
165 {
166 mp_irqs[mp_irq_entries] = *m;
167 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
168 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
169 m->mpc_irqtype, m->mpc_irqflag & 3,
170 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
171 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
172 if (++mp_irq_entries >= MAX_IRQ_SOURCES)
173 panic("Max # of irq sources exceeded!!\n");
174 }
175
176 static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
177 {
178 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
179 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
180 m->mpc_irqtype, m->mpc_irqflag & 3,
181 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
182 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
183 }
184
185 /*
186 * Read/parse the MPC
187 */
188 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
189 {
190 char str[16];
191 int count = sizeof(*mpc);
192 unsigned char *mpt = ((unsigned char *)mpc) + count;
193
194 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
195 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
196 mpc->mpc_signature[0],
197 mpc->mpc_signature[1],
198 mpc->mpc_signature[2], mpc->mpc_signature[3]);
199 return 0;
200 }
201 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
202 printk(KERN_ERR "MPTABLE: checksum error!\n");
203 return 0;
204 }
205 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
206 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
207 mpc->mpc_spec);
208 return 0;
209 }
210 if (!mpc->mpc_lapic) {
211 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
212 return 0;
213 }
214 memcpy(str, mpc->mpc_oem, 8);
215 str[8] = 0;
216 printk(KERN_INFO "MPTABLE: OEM ID: %s ", str);
217
218 memcpy(str, mpc->mpc_productid, 12);
219 str[12] = 0;
220 printk(KERN_INFO "MPTABLE: Product ID: %s ", str);
221
222 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
223
224 /* save the local APIC address, it might be non-default */
225 if (!acpi_lapic)
226 mp_lapic_addr = mpc->mpc_lapic;
227
228 if (early)
229 return 1;
230
231 /*
232 * Now process the configuration blocks.
233 */
234 while (count < mpc->mpc_length) {
235 switch (*mpt) {
236 case MP_PROCESSOR:
237 {
238 struct mpc_config_processor *m =
239 (struct mpc_config_processor *)mpt;
240 if (!acpi_lapic)
241 MP_processor_info(m);
242 mpt += sizeof(*m);
243 count += sizeof(*m);
244 break;
245 }
246 case MP_BUS:
247 {
248 struct mpc_config_bus *m =
249 (struct mpc_config_bus *)mpt;
250 MP_bus_info(m);
251 mpt += sizeof(*m);
252 count += sizeof(*m);
253 break;
254 }
255 case MP_IOAPIC:
256 {
257 struct mpc_config_ioapic *m =
258 (struct mpc_config_ioapic *)mpt;
259 MP_ioapic_info(m);
260 mpt += sizeof(*m);
261 count += sizeof(*m);
262 break;
263 }
264 case MP_INTSRC:
265 {
266 struct mpc_config_intsrc *m =
267 (struct mpc_config_intsrc *)mpt;
268
269 MP_intsrc_info(m);
270 mpt += sizeof(*m);
271 count += sizeof(*m);
272 break;
273 }
274 case MP_LINTSRC:
275 {
276 struct mpc_config_lintsrc *m =
277 (struct mpc_config_lintsrc *)mpt;
278 MP_lintsrc_info(m);
279 mpt += sizeof(*m);
280 count += sizeof(*m);
281 break;
282 }
283 }
284 }
285 setup_apic_routing();
286 if (!num_processors)
287 printk(KERN_ERR "MPTABLE: no processors registered!\n");
288 return num_processors;
289 }
290
291 static int __init ELCR_trigger(unsigned int irq)
292 {
293 unsigned int port;
294
295 port = 0x4d0 + (irq >> 3);
296 return (inb(port) >> (irq & 7)) & 1;
297 }
298
299 static void __init construct_default_ioirq_mptable(int mpc_default_type)
300 {
301 struct mpc_config_intsrc intsrc;
302 int i;
303 int ELCR_fallback = 0;
304
305 intsrc.mpc_type = MP_INTSRC;
306 intsrc.mpc_irqflag = 0; /* conforming */
307 intsrc.mpc_srcbus = 0;
308 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
309
310 intsrc.mpc_irqtype = mp_INT;
311
312 /*
313 * If true, we have an ISA/PCI system with no IRQ entries
314 * in the MP table. To prevent the PCI interrupts from being set up
315 * incorrectly, we try to use the ELCR. The sanity check to see if
316 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
317 * never be level sensitive, so we simply see if the ELCR agrees.
318 * If it does, we assume it's valid.
319 */
320 if (mpc_default_type == 5) {
321 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
322 "falling back to ELCR\n");
323
324 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
325 ELCR_trigger(13))
326 printk(KERN_ERR "ELCR contains invalid data... "
327 "not using ELCR\n");
328 else {
329 printk(KERN_INFO
330 "Using ELCR to identify PCI interrupts\n");
331 ELCR_fallback = 1;
332 }
333 }
334
335 for (i = 0; i < 16; i++) {
336 switch (mpc_default_type) {
337 case 2:
338 if (i == 0 || i == 13)
339 continue; /* IRQ0 & IRQ13 not connected */
340 /* fall through */
341 default:
342 if (i == 2)
343 continue; /* IRQ2 is never connected */
344 }
345
346 if (ELCR_fallback) {
347 /*
348 * If the ELCR indicates a level-sensitive interrupt, we
349 * copy that information over to the MP table in the
350 * irqflag field (level sensitive, active high polarity).
351 */
352 if (ELCR_trigger(i))
353 intsrc.mpc_irqflag = 13;
354 else
355 intsrc.mpc_irqflag = 0;
356 }
357
358 intsrc.mpc_srcbusirq = i;
359 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
360 MP_intsrc_info(&intsrc);
361 }
362
363 intsrc.mpc_irqtype = mp_ExtINT;
364 intsrc.mpc_srcbusirq = 0;
365 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
366 MP_intsrc_info(&intsrc);
367 }
368
369 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
370 {
371 struct mpc_config_processor processor;
372 struct mpc_config_bus bus;
373 struct mpc_config_ioapic ioapic;
374 struct mpc_config_lintsrc lintsrc;
375 int linttypes[2] = { mp_ExtINT, mp_NMI };
376 int i;
377
378 /*
379 * local APIC has default address
380 */
381 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
382
383 /*
384 * 2 CPUs, numbered 0 & 1.
385 */
386 processor.mpc_type = MP_PROCESSOR;
387 processor.mpc_apicver = 0;
388 processor.mpc_cpuflag = CPU_ENABLED;
389 processor.mpc_cpufeature = 0;
390 processor.mpc_featureflag = 0;
391 processor.mpc_reserved[0] = 0;
392 processor.mpc_reserved[1] = 0;
393 for (i = 0; i < 2; i++) {
394 processor.mpc_apicid = i;
395 MP_processor_info(&processor);
396 }
397
398 bus.mpc_type = MP_BUS;
399 bus.mpc_busid = 0;
400 switch (mpc_default_type) {
401 default:
402 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
403 mpc_default_type);
404 /* fall through */
405 case 1:
406 case 5:
407 memcpy(bus.mpc_bustype, "ISA ", 6);
408 break;
409 }
410 MP_bus_info(&bus);
411 if (mpc_default_type > 4) {
412 bus.mpc_busid = 1;
413 memcpy(bus.mpc_bustype, "PCI ", 6);
414 MP_bus_info(&bus);
415 }
416
417 ioapic.mpc_type = MP_IOAPIC;
418 ioapic.mpc_apicid = 2;
419 ioapic.mpc_apicver = 0;
420 ioapic.mpc_flags = MPC_APIC_USABLE;
421 ioapic.mpc_apicaddr = 0xFEC00000;
422 MP_ioapic_info(&ioapic);
423
424 /*
425 * We set up most of the low 16 IO-APIC pins according to MPS rules.
426 */
427 construct_default_ioirq_mptable(mpc_default_type);
428
429 lintsrc.mpc_type = MP_LINTSRC;
430 lintsrc.mpc_irqflag = 0; /* conforming */
431 lintsrc.mpc_srcbusid = 0;
432 lintsrc.mpc_srcbusirq = 0;
433 lintsrc.mpc_destapic = MP_APIC_ALL;
434 for (i = 0; i < 2; i++) {
435 lintsrc.mpc_irqtype = linttypes[i];
436 lintsrc.mpc_destapiclint = i;
437 MP_lintsrc_info(&lintsrc);
438 }
439 }
440
441 static struct intel_mp_floating *mpf_found;
442
443 /*
444 * Scan the memory blocks for an SMP configuration block.
445 */
446 static void __init __get_smp_config(unsigned early)
447 {
448 struct intel_mp_floating *mpf = mpf_found;
449
450 if (acpi_lapic && early)
451 return;
452 /*
453 * ACPI supports both logical (e.g. Hyper-Threading) and physical
454 * processors, where MPS only supports physical.
455 */
456 if (acpi_lapic && acpi_ioapic) {
457 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
458 "information\n");
459 return;
460 } else if (acpi_lapic)
461 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
462 "configuration information\n");
463
464 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
465 mpf->mpf_specification);
466
467 /*
468 * Now see if we need to read further.
469 */
470 if (mpf->mpf_feature1 != 0) {
471 if (early) {
472 /*
473 * local APIC has default address
474 */
475 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
476 return;
477 }
478
479 printk(KERN_INFO "Default MP configuration #%d\n",
480 mpf->mpf_feature1);
481 construct_default_ISA_mptable(mpf->mpf_feature1);
482
483 } else if (mpf->mpf_physptr) {
484
485 /*
486 * Read the physical hardware table. Anything here will
487 * override the defaults.
488 */
489 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
490 smp_found_config = 0;
491 printk(KERN_ERR
492 "BIOS bug, MP table errors detected!...\n");
493 printk(KERN_ERR "... disabling SMP support. "
494 "(tell your hw vendor)\n");
495 return;
496 }
497
498 if (early)
499 return;
500 /*
501 * If there are no explicit MP IRQ entries, then we are
502 * broken. We set up most of the low 16 IO-APIC pins to
503 * ISA defaults and hope it will work.
504 */
505 if (!mp_irq_entries) {
506 struct mpc_config_bus bus;
507
508 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
509 "using default mptable. "
510 "(tell your hw vendor)\n");
511
512 bus.mpc_type = MP_BUS;
513 bus.mpc_busid = 0;
514 memcpy(bus.mpc_bustype, "ISA ", 6);
515 MP_bus_info(&bus);
516
517 construct_default_ioirq_mptable(0);
518 }
519
520 } else
521 BUG();
522
523 if (!early)
524 printk(KERN_INFO "Processors: %d\n", num_processors);
525 /*
526 * Only use the first configuration found.
527 */
528 }
529
530 void __init early_get_smp_config(void)
531 {
532 __get_smp_config(1);
533 }
534
535 void __init get_smp_config(void)
536 {
537 __get_smp_config(0);
538 }
539
540 static int __init smp_scan_config(unsigned long base, unsigned long length,
541 unsigned reserve)
542 {
543 extern void __bad_mpf_size(void);
544 unsigned int *bp = phys_to_virt(base);
545 struct intel_mp_floating *mpf;
546
547 Dprintk("Scan SMP from %p for %ld bytes.\n", bp, length);
548 if (sizeof(*mpf) != 16)
549 __bad_mpf_size();
550
551 while (length > 0) {
552 mpf = (struct intel_mp_floating *)bp;
553 if ((*bp == SMP_MAGIC_IDENT) &&
554 (mpf->mpf_length == 1) &&
555 !mpf_checksum((unsigned char *)bp, 16) &&
556 ((mpf->mpf_specification == 1)
557 || (mpf->mpf_specification == 4))) {
558
559 smp_found_config = 1;
560 mpf_found = mpf;
561
562 if (!reserve)
563 return 1;
564
565 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
566 if (mpf->mpf_physptr)
567 reserve_bootmem_generic(mpf->mpf_physptr,
568 PAGE_SIZE);
569 return 1;
570 }
571 bp += 4;
572 length -= 16;
573 }
574 return 0;
575 }
576
577 static void __init __find_smp_config(unsigned reserve)
578 {
579 unsigned int address;
580
581 /*
582 * FIXME: Linux assumes you have 640K of base ram..
583 * this continues the error...
584 *
585 * 1) Scan the bottom 1K for a signature
586 * 2) Scan the top 1K of base RAM
587 * 3) Scan the 64K of bios
588 */
589 if (smp_scan_config(0x0, 0x400, reserve) ||
590 smp_scan_config(639 * 0x400, 0x400, reserve) ||
591 smp_scan_config(0xF0000, 0x10000, reserve))
592 return;
593 /*
594 * If it is an SMP machine we should know now.
595 *
596 * there is a real-mode segmented pointer pointing to the
597 * 4K EBDA area at 0x40E, calculate and scan it here.
598 *
599 * NOTE! There are Linux loaders that will corrupt the EBDA
600 * area, and as such this kind of SMP config may be less
601 * trustworthy, simply because the SMP table may have been
602 * stomped on during early boot. These loaders are buggy and
603 * should be fixed.
604 *
605 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
606 */
607
608 address = get_bios_ebda();
609 if (address)
610 smp_scan_config(address, 0x400, reserve);
611 }
612
613 void __init early_find_smp_config(void)
614 {
615 __find_smp_config(0);
616 }
617
618 void __init find_smp_config(void)
619 {
620 __find_smp_config(1);
621 }
622
623 /* --------------------------------------------------------------------------
624 ACPI-based MP Configuration
625 -------------------------------------------------------------------------- */
626
627 #ifdef CONFIG_ACPI
628
629 #define MP_ISA_BUS 0
630 #define MP_MAX_IOAPIC_PIN 127
631
632 extern struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS];
633
634 static int mp_find_ioapic(int gsi)
635 {
636 int i = 0;
637
638 /* Find the IOAPIC that manages this GSI. */
639 for (i = 0; i < nr_ioapics; i++) {
640 if ((gsi >= mp_ioapic_routing[i].gsi_base)
641 && (gsi <= mp_ioapic_routing[i].gsi_end))
642 return i;
643 }
644
645 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
646 return -1;
647 }
648
649 static u8 uniq_ioapic_id(u8 id)
650 {
651 int i;
652 DECLARE_BITMAP(used, 256);
653 bitmap_zero(used, 256);
654 for (i = 0; i < nr_ioapics; i++) {
655 struct mpc_config_ioapic *ia = &mp_ioapics[i];
656 __set_bit(ia->mpc_apicid, used);
657 }
658 if (!test_bit(id, used))
659 return id;
660 return find_first_zero_bit(used, 256);
661 }
662
663 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
664 {
665 int idx = 0;
666
667 if (bad_ioapic(address))
668 return;
669
670 idx = nr_ioapics;
671
672 mp_ioapics[idx].mpc_type = MP_IOAPIC;
673 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
674 mp_ioapics[idx].mpc_apicaddr = address;
675
676 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
677 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
678 mp_ioapics[idx].mpc_apicver = 0;
679
680 /*
681 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
682 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
683 */
684 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
685 mp_ioapic_routing[idx].gsi_base = gsi_base;
686 mp_ioapic_routing[idx].gsi_end = gsi_base +
687 io_apic_get_redir_entries(idx);
688
689 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, address 0x%x, "
690 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
691 mp_ioapics[idx].mpc_apicaddr,
692 mp_ioapic_routing[idx].gsi_base,
693 mp_ioapic_routing[idx].gsi_end);
694
695 nr_ioapics++;
696 }
697
698 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
699 {
700 struct mpc_config_intsrc intsrc;
701 int ioapic = -1;
702 int pin = -1;
703
704 /*
705 * Convert 'gsi' to 'ioapic.pin'.
706 */
707 ioapic = mp_find_ioapic(gsi);
708 if (ioapic < 0)
709 return;
710 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
711
712 /*
713 * TBD: This check is for faulty timer entries, where the override
714 * erroneously sets the trigger to level, resulting in a HUGE
715 * increase of timer interrupts!
716 */
717 if ((bus_irq == 0) && (trigger == 3))
718 trigger = 1;
719
720 intsrc.mpc_type = MP_INTSRC;
721 intsrc.mpc_irqtype = mp_INT;
722 intsrc.mpc_irqflag = (trigger << 2) | polarity;
723 intsrc.mpc_srcbus = MP_ISA_BUS;
724 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
725 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
726 intsrc.mpc_dstirq = pin; /* INTIN# */
727
728 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
729 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
730 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
731 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
732
733 mp_irqs[mp_irq_entries] = intsrc;
734 if (++mp_irq_entries == MAX_IRQ_SOURCES)
735 panic("Max # of irq sources exceeded!\n");
736 }
737
738 void __init mp_config_acpi_legacy_irqs(void)
739 {
740 struct mpc_config_intsrc intsrc;
741 int i = 0;
742 int ioapic = -1;
743
744 /*
745 * Fabricate the legacy ISA bus (bus #31).
746 */
747 set_bit(MP_ISA_BUS, mp_bus_not_pci);
748
749 /*
750 * Locate the IOAPIC that manages the ISA IRQs (0-15).
751 */
752 ioapic = mp_find_ioapic(0);
753 if (ioapic < 0)
754 return;
755
756 intsrc.mpc_type = MP_INTSRC;
757 intsrc.mpc_irqflag = 0; /* Conforming */
758 intsrc.mpc_srcbus = MP_ISA_BUS;
759 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
760
761 /*
762 * Use the default configuration for the IRQs 0-15. Unless
763 * overridden by (MADT) interrupt source override entries.
764 */
765 for (i = 0; i < 16; i++) {
766 int idx;
767
768 for (idx = 0; idx < mp_irq_entries; idx++) {
769 struct mpc_config_intsrc *irq = mp_irqs + idx;
770
771 /* Do we already have a mapping for this ISA IRQ? */
772 if (irq->mpc_srcbus == MP_ISA_BUS
773 && irq->mpc_srcbusirq == i)
774 break;
775
776 /* Do we already have a mapping for this IOAPIC pin */
777 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
778 (irq->mpc_dstirq == i))
779 break;
780 }
781
782 if (idx != mp_irq_entries) {
783 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
784 continue; /* IRQ already used */
785 }
786
787 intsrc.mpc_irqtype = mp_INT;
788 intsrc.mpc_srcbusirq = i; /* Identity mapped */
789 intsrc.mpc_dstirq = i;
790
791 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
792 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
793 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
794 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
795 intsrc.mpc_dstirq);
796
797 mp_irqs[mp_irq_entries] = intsrc;
798 if (++mp_irq_entries == MAX_IRQ_SOURCES)
799 panic("Max # of irq sources exceeded!\n");
800 }
801 }
802
803 int mp_register_gsi(u32 gsi, int triggering, int polarity)
804 {
805 int ioapic = -1;
806 int ioapic_pin = 0;
807 int idx, bit = 0;
808
809 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
810 return gsi;
811
812 /* Don't set up the ACPI SCI because it's already set up */
813 if (acpi_gbl_FADT.sci_interrupt == gsi)
814 return gsi;
815
816 ioapic = mp_find_ioapic(gsi);
817 if (ioapic < 0) {
818 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
819 return gsi;
820 }
821
822 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
823
824 /*
825 * Avoid pin reprogramming. PRTs typically include entries
826 * with redundant pin->gsi mappings (but unique PCI devices);
827 * we only program the IOAPIC on the first.
828 */
829 bit = ioapic_pin % 32;
830 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
831 if (idx > 3) {
832 printk(KERN_ERR "Invalid reference to IOAPIC pin "
833 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
834 ioapic_pin);
835 return gsi;
836 }
837 if ((1 << bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
838 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
839 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
840 return gsi;
841 }
842
843 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1 << bit);
844
845 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
846 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
847 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
848 return gsi;
849 }
850 #endif /* CONFIG_ACPI */
Linux kernel - Deliverables
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