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TOMOYO Linux Cross Reference
Linux/arch/x86/kernel/mpparse.c

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  1 /*
  2  *      Intel Multiprocessor Specification 1.1 and 1.4
  3  *      compliant MP-table parsing routines.
  4  *
  5  *      (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
  6  *      (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com>
  7  *      (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
  8  */
  9 
 10 #include <linux/mm.h>
 11 #include <linux/init.h>
 12 #include <linux/delay.h>
 13 #include <linux/bootmem.h>
 14 #include <linux/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/module.h>
 20 #include <linux/smp.h>
 21 #include <linux/pci.h>
 22 
 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.h>
 30 #include <asm/setup.h>
 31 #include <asm/smp.h>
 32 
 33 #include <asm/apic.h>
 34 /*
 35  * Checksum an MP configuration block.
 36  */
 37 
 38 static int __init mpf_checksum(unsigned char *mp, int len)
 39 {
 40         int sum = 0;
 41 
 42         while (len--)
 43                 sum += *mp++;
 44 
 45         return sum & 0xFF;
 46 }
 47 
 48 int __init default_mpc_apic_id(struct mpc_cpu *m)
 49 {
 50         return m->apicid;
 51 }
 52 
 53 static void __init MP_processor_info(struct mpc_cpu *m)
 54 {
 55         int apicid;
 56         char *bootup_cpu = "";
 57 
 58         if (!(m->cpuflag & CPU_ENABLED)) {
 59                 disabled_cpus++;
 60                 return;
 61         }
 62 
 63         apicid = x86_init.mpparse.mpc_apic_id(m);
 64 
 65         if (m->cpuflag & CPU_BOOTPROCESSOR) {
 66                 bootup_cpu = " (Bootup-CPU)";
 67                 boot_cpu_physical_apicid = m->apicid;
 68         }
 69 
 70         printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
 71         generic_processor_info(apicid, m->apicver);
 72 }
 73 
 74 #ifdef CONFIG_X86_IO_APIC
 75 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
 76 {
 77         memcpy(str, m->bustype, 6);
 78         str[6] = 0;
 79         apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
 80 }
 81 
 82 static void __init MP_bus_info(struct mpc_bus *m)
 83 {
 84         char str[7];
 85 
 86         x86_init.mpparse.mpc_oem_bus_info(m, str);
 87 
 88 #if MAX_MP_BUSSES < 256
 89         if (m->busid >= MAX_MP_BUSSES) {
 90                 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
 91                        " is too large, max. supported is %d\n",
 92                        m->busid, str, MAX_MP_BUSSES - 1);
 93                 return;
 94         }
 95 #endif
 96 
 97         set_bit(m->busid, mp_bus_not_pci);
 98         if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
 99 #ifdef CONFIG_EISA
100                 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
101 #endif
102         } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
103                 if (x86_init.mpparse.mpc_oem_pci_bus)
104                         x86_init.mpparse.mpc_oem_pci_bus(m);
105 
106                 clear_bit(m->busid, mp_bus_not_pci);
107 #ifdef CONFIG_EISA
108                 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
109         } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
110                 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
111 #endif
112         } else
113                 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
114 }
115 
116 static void __init MP_ioapic_info(struct mpc_ioapic *m)
117 {
118         if (m->flags & MPC_APIC_USABLE)
119                 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top);
120 }
121 
122 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
123 {
124         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
125                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
126                 mp_irq->irqtype, mp_irq->irqflag & 3,
127                 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
128                 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
129 }
130 
131 #else /* CONFIG_X86_IO_APIC */
132 static inline void __init MP_bus_info(struct mpc_bus *m) {}
133 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
134 #endif /* CONFIG_X86_IO_APIC */
135 
136 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
137 {
138         apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
139                 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
140                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
141                 m->srcbusirq, m->destapic, m->destapiclint);
142 }
143 
144 /*
145  * Read/parse the MPC
146  */
147 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
148 {
149 
150         if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
151                 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
152                        mpc->signature[0], mpc->signature[1],
153                        mpc->signature[2], mpc->signature[3]);
154                 return 0;
155         }
156         if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
157                 printk(KERN_ERR "MPTABLE: checksum error!\n");
158                 return 0;
159         }
160         if (mpc->spec != 0x01 && mpc->spec != 0x04) {
161                 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
162                        mpc->spec);
163                 return 0;
164         }
165         if (!mpc->lapic) {
166                 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
167                 return 0;
168         }
169         memcpy(oem, mpc->oem, 8);
170         oem[8] = 0;
171         printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
172 
173         memcpy(str, mpc->productid, 12);
174         str[12] = 0;
175 
176         printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
177 
178         printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
179 
180         return 1;
181 }
182 
183 static void skip_entry(unsigned char **ptr, int *count, int size)
184 {
185         *ptr += size;
186         *count += size;
187 }
188 
189 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
190 {
191         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
192                 "type %x\n", *mpt);
193         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
194                         1, mpc, mpc->length, 1);
195 }
196 
197 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
198 
199 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
200 {
201         char str[16];
202         char oem[10];
203 
204         int count = sizeof(*mpc);
205         unsigned char *mpt = ((unsigned char *)mpc) + count;
206 
207         if (!smp_check_mpc(mpc, oem, str))
208                 return 0;
209 
210 #ifdef CONFIG_X86_32
211         generic_mps_oem_check(mpc, oem, str);
212 #endif
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                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
263         return num_processors;
264 }
265 
266 #ifdef CONFIG_X86_IO_APIC
267 
268 static 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 
276 static 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 = 0;     /* conforming */
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                 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
299                        "falling back to ELCR\n");
300 
301                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
302                     ELCR_trigger(13))
303                         printk(KERN_ERR "ELCR contains invalid data... "
304                                "not using ELCR\n");
305                 else {
306                         printk(KERN_INFO
307                                "Using ELCR to identify PCI interrupts\n");
308                         ELCR_fallback = 1;
309                 }
310         }
311 
312         for (i = 0; i < 16; i++) {
313                 switch (mpc_default_type) {
314                 case 2:
315                         if (i == 0 || i == 13)
316                                 continue;       /* IRQ0 & IRQ13 not connected */
317                         /* fall through */
318                 default:
319                         if (i == 2)
320                                 continue;       /* IRQ2 is never connected */
321                 }
322 
323                 if (ELCR_fallback) {
324                         /*
325                          *  If the ELCR indicates a level-sensitive interrupt, we
326                          *  copy that information over to the MP table in the
327                          *  irqflag field (level sensitive, active high polarity).
328                          */
329                         if (ELCR_trigger(i))
330                                 intsrc.irqflag = 13;
331                         else
332                                 intsrc.irqflag = 0;
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 
347 static 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                 printk(KERN_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
389 static inline void __init construct_ioapic_table(int mpc_default_type) { }
390 #endif
391 
392 static 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_mask;
413         processor.featureflag = boot_cpu_data.x86_capability[0];
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 = 0;            /* conforming */
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 
435 static struct mpf_intel *mpf_found;
436 
437 static unsigned long __init get_mpc_size(unsigned long physptr)
438 {
439         struct mpc_table *mpc;
440         unsigned long size;
441 
442         mpc = early_ioremap(physptr, PAGE_SIZE);
443         size = mpc->length;
444         early_iounmap(mpc, PAGE_SIZE);
445         apic_printk(APIC_VERBOSE, "  mpc: %lx-%lx\n", physptr, physptr + size);
446 
447         return size;
448 }
449 
450 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
451 {
452         struct mpc_table *mpc;
453         unsigned long size;
454 
455         size = get_mpc_size(mpf->physptr);
456         mpc = early_ioremap(mpf->physptr, size);
457         /*
458          * Read the physical hardware table.  Anything here will
459          * override the defaults.
460          */
461         if (!smp_read_mpc(mpc, early)) {
462 #ifdef CONFIG_X86_LOCAL_APIC
463                 smp_found_config = 0;
464 #endif
465                 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
466                         "... disabling SMP support. (tell your hw vendor)\n");
467                 early_iounmap(mpc, size);
468                 return -1;
469         }
470         early_iounmap(mpc, size);
471 
472         if (early)
473                 return -1;
474 
475 #ifdef CONFIG_X86_IO_APIC
476         /*
477          * If there are no explicit MP IRQ entries, then we are
478          * broken.  We set up most of the low 16 IO-APIC pins to
479          * ISA defaults and hope it will work.
480          */
481         if (!mp_irq_entries) {
482                 struct mpc_bus bus;
483 
484                 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
485                        "using default mptable. (tell your hw vendor)\n");
486 
487                 bus.type = MP_BUS;
488                 bus.busid = 0;
489                 memcpy(bus.bustype, "ISA   ", 6);
490                 MP_bus_info(&bus);
491 
492                 construct_default_ioirq_mptable(0);
493         }
494 #endif
495 
496         return 0;
497 }
498 
499 /*
500  * Scan the memory blocks for an SMP configuration block.
501  */
502 void __init default_get_smp_config(unsigned int early)
503 {
504         struct mpf_intel *mpf = mpf_found;
505 
506         if (!mpf)
507                 return;
508 
509         if (acpi_lapic && early)
510                 return;
511 
512         /*
513          * MPS doesn't support hyperthreading, aka only have
514          * thread 0 apic id in MPS table
515          */
516         if (acpi_lapic && acpi_ioapic)
517                 return;
518 
519         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
520                mpf->specification);
521 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
522         if (mpf->feature2 & (1 << 7)) {
523                 printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
524                 pic_mode = 1;
525         } else {
526                 printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
527                 pic_mode = 0;
528         }
529 #endif
530         /*
531          * Now see if we need to read further.
532          */
533         if (mpf->feature1 != 0) {
534                 if (early) {
535                         /*
536                          * local APIC has default address
537                          */
538                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
539                         return;
540                 }
541 
542                 printk(KERN_INFO "Default MP configuration #%d\n",
543                        mpf->feature1);
544                 construct_default_ISA_mptable(mpf->feature1);
545 
546         } else if (mpf->physptr) {
547                 if (check_physptr(mpf, early))
548                         return;
549         } else
550                 BUG();
551 
552         if (!early)
553                 printk(KERN_INFO "Processors: %d\n", num_processors);
554         /*
555          * Only use the first configuration found.
556          */
557 }
558 
559 static void __init smp_reserve_memory(struct mpf_intel *mpf)
560 {
561         memblock_reserve(mpf->physptr, get_mpc_size(mpf->physptr));
562 }
563 
564 static int __init smp_scan_config(unsigned long base, unsigned long length)
565 {
566         unsigned int *bp = phys_to_virt(base);
567         struct mpf_intel *mpf;
568         unsigned long mem;
569 
570         apic_printk(APIC_VERBOSE, "Scan for SMP in [mem %#010lx-%#010lx]\n",
571                     base, base + length - 1);
572         BUILD_BUG_ON(sizeof(*mpf) != 16);
573 
574         while (length > 0) {
575                 mpf = (struct mpf_intel *)bp;
576                 if ((*bp == SMP_MAGIC_IDENT) &&
577                     (mpf->length == 1) &&
578                     !mpf_checksum((unsigned char *)bp, 16) &&
579                     ((mpf->specification == 1)
580                      || (mpf->specification == 4))) {
581 #ifdef CONFIG_X86_LOCAL_APIC
582                         smp_found_config = 1;
583 #endif
584                         mpf_found = mpf;
585 
586                         printk(KERN_INFO "found SMP MP-table at [mem %#010llx-%#010llx] mapped at [%p]\n",
587                                (unsigned long long) virt_to_phys(mpf),
588                                (unsigned long long) virt_to_phys(mpf) +
589                                sizeof(*mpf) - 1, mpf);
590 
591                         mem = virt_to_phys(mpf);
592                         memblock_reserve(mem, sizeof(*mpf));
593                         if (mpf->physptr)
594                                 smp_reserve_memory(mpf);
595 
596                         return 1;
597                 }
598                 bp += 4;
599                 length -= 16;
600         }
601         return 0;
602 }
603 
604 void __init default_find_smp_config(void)
605 {
606         unsigned int address;
607 
608         /*
609          * FIXME: Linux assumes you have 640K of base ram..
610          * this continues the error...
611          *
612          * 1) Scan the bottom 1K for a signature
613          * 2) Scan the top 1K of base RAM
614          * 3) Scan the 64K of bios
615          */
616         if (smp_scan_config(0x0, 0x400) ||
617             smp_scan_config(639 * 0x400, 0x400) ||
618             smp_scan_config(0xF0000, 0x10000))
619                 return;
620         /*
621          * If it is an SMP machine we should know now, unless the
622          * configuration is in an EISA bus machine with an
623          * extended bios data area.
624          *
625          * there is a real-mode segmented pointer pointing to the
626          * 4K EBDA area at 0x40E, calculate and scan it here.
627          *
628          * NOTE! There are Linux loaders that will corrupt the EBDA
629          * area, and as such this kind of SMP config may be less
630          * trustworthy, simply because the SMP table may have been
631          * stomped on during early boot. These loaders are buggy and
632          * should be fixed.
633          *
634          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
635          */
636 
637         address = get_bios_ebda();
638         if (address)
639                 smp_scan_config(address, 0x400);
640 }
641 
642 #ifdef CONFIG_X86_IO_APIC
643 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
644 
645 static int  __init get_MP_intsrc_index(struct mpc_intsrc *m)
646 {
647         int i;
648 
649         if (m->irqtype != mp_INT)
650                 return 0;
651 
652         if (m->irqflag != 0x0f)
653                 return 0;
654 
655         /* not legacy */
656 
657         for (i = 0; i < mp_irq_entries; i++) {
658                 if (mp_irqs[i].irqtype != mp_INT)
659                         continue;
660 
661                 if (mp_irqs[i].irqflag != 0x0f)
662                         continue;
663 
664                 if (mp_irqs[i].srcbus != m->srcbus)
665                         continue;
666                 if (mp_irqs[i].srcbusirq != m->srcbusirq)
667                         continue;
668                 if (irq_used[i]) {
669                         /* already claimed */
670                         return -2;
671                 }
672                 irq_used[i] = 1;
673                 return i;
674         }
675 
676         /* not found */
677         return -1;
678 }
679 
680 #define SPARE_SLOT_NUM 20
681 
682 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
683 
684 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
685 {
686         int i;
687 
688         apic_printk(APIC_VERBOSE, "OLD ");
689         print_mp_irq_info(m);
690 
691         i = get_MP_intsrc_index(m);
692         if (i > 0) {
693                 memcpy(m, &mp_irqs[i], sizeof(*m));
694                 apic_printk(APIC_VERBOSE, "NEW ");
695                 print_mp_irq_info(&mp_irqs[i]);
696                 return;
697         }
698         if (!i) {
699                 /* legacy, do nothing */
700                 return;
701         }
702         if (*nr_m_spare < SPARE_SLOT_NUM) {
703                 /*
704                  * not found (-1), or duplicated (-2) are invalid entries,
705                  * we need to use the slot later
706                  */
707                 m_spare[*nr_m_spare] = m;
708                 *nr_m_spare += 1;
709         }
710 }
711 
712 static int __init
713 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
714 {
715         if (!mpc_new_phys || count <= mpc_new_length) {
716                 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
717                 return -1;
718         }
719 
720         return 0;
721 }
722 #else /* CONFIG_X86_IO_APIC */
723 static
724 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
725 #endif /* CONFIG_X86_IO_APIC */
726 
727 static int  __init replace_intsrc_all(struct mpc_table *mpc,
728                                         unsigned long mpc_new_phys,
729                                         unsigned long mpc_new_length)
730 {
731 #ifdef CONFIG_X86_IO_APIC
732         int i;
733 #endif
734         int count = sizeof(*mpc);
735         int nr_m_spare = 0;
736         unsigned char *mpt = ((unsigned char *)mpc) + count;
737 
738         printk(KERN_INFO "mpc_length %x\n", mpc->length);
739         while (count < mpc->length) {
740                 switch (*mpt) {
741                 case MP_PROCESSOR:
742                         skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
743                         break;
744                 case MP_BUS:
745                         skip_entry(&mpt, &count, sizeof(struct mpc_bus));
746                         break;
747                 case MP_IOAPIC:
748                         skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
749                         break;
750                 case MP_INTSRC:
751                         check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
752                         skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
753                         break;
754                 case MP_LINTSRC:
755                         skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
756                         break;
757                 default:
758                         /* wrong mptable */
759                         smp_dump_mptable(mpc, mpt);
760                         goto out;
761                 }
762         }
763 
764 #ifdef CONFIG_X86_IO_APIC
765         for (i = 0; i < mp_irq_entries; i++) {
766                 if (irq_used[i])
767                         continue;
768 
769                 if (mp_irqs[i].irqtype != mp_INT)
770                         continue;
771 
772                 if (mp_irqs[i].irqflag != 0x0f)
773                         continue;
774 
775                 if (nr_m_spare > 0) {
776                         apic_printk(APIC_VERBOSE, "*NEW* found\n");
777                         nr_m_spare--;
778                         memcpy(m_spare[nr_m_spare], &mp_irqs[i], sizeof(mp_irqs[i]));
779                         m_spare[nr_m_spare] = NULL;
780                 } else {
781                         struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
782                         count += sizeof(struct mpc_intsrc);
783                         if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
784                                 goto out;
785                         memcpy(m, &mp_irqs[i], sizeof(*m));
786                         mpc->length = count;
787                         mpt += sizeof(struct mpc_intsrc);
788                 }
789                 print_mp_irq_info(&mp_irqs[i]);
790         }
791 #endif
792 out:
793         /* update checksum */
794         mpc->checksum = 0;
795         mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
796 
797         return 0;
798 }
799 
800 int enable_update_mptable;
801 
802 static int __init update_mptable_setup(char *str)
803 {
804         enable_update_mptable = 1;
805 #ifdef CONFIG_PCI
806         pci_routeirq = 1;
807 #endif
808         return 0;
809 }
810 early_param("update_mptable", update_mptable_setup);
811 
812 static unsigned long __initdata mpc_new_phys;
813 static unsigned long mpc_new_length __initdata = 4096;
814 
815 /* alloc_mptable or alloc_mptable=4k */
816 static int __initdata alloc_mptable;
817 static int __init parse_alloc_mptable_opt(char *p)
818 {
819         enable_update_mptable = 1;
820 #ifdef CONFIG_PCI
821         pci_routeirq = 1;
822 #endif
823         alloc_mptable = 1;
824         if (!p)
825                 return 0;
826         mpc_new_length = memparse(p, &p);
827         return 0;
828 }
829 early_param("alloc_mptable", parse_alloc_mptable_opt);
830 
831 void __init early_reserve_e820_mpc_new(void)
832 {
833         if (enable_update_mptable && alloc_mptable)
834                 mpc_new_phys = early_reserve_e820(mpc_new_length, 4);
835 }
836 
837 static int __init update_mp_table(void)
838 {
839         char str[16];
840         char oem[10];
841         struct mpf_intel *mpf;
842         struct mpc_table *mpc, *mpc_new;
843 
844         if (!enable_update_mptable)
845                 return 0;
846 
847         mpf = mpf_found;
848         if (!mpf)
849                 return 0;
850 
851         /*
852          * Now see if we need to go further.
853          */
854         if (mpf->feature1 != 0)
855                 return 0;
856 
857         if (!mpf->physptr)
858                 return 0;
859 
860         mpc = phys_to_virt(mpf->physptr);
861 
862         if (!smp_check_mpc(mpc, oem, str))
863                 return 0;
864 
865         printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
866         printk(KERN_INFO "physptr: %x\n", mpf->physptr);
867 
868         if (mpc_new_phys && mpc->length > mpc_new_length) {
869                 mpc_new_phys = 0;
870                 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
871                          mpc_new_length);
872         }
873 
874         if (!mpc_new_phys) {
875                 unsigned char old, new;
876                 /* check if we can change the position */
877                 mpc->checksum = 0;
878                 old = mpf_checksum((unsigned char *)mpc, mpc->length);
879                 mpc->checksum = 0xff;
880                 new = mpf_checksum((unsigned char *)mpc, mpc->length);
881                 if (old == new) {
882                         printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
883                         return 0;
884                 }
885                 printk(KERN_INFO "use in-position replacing\n");
886         } else {
887                 mpf->physptr = mpc_new_phys;
888                 mpc_new = phys_to_virt(mpc_new_phys);
889                 memcpy(mpc_new, mpc, mpc->length);
890                 mpc = mpc_new;
891                 /* check if we can modify that */
892                 if (mpc_new_phys - mpf->physptr) {
893                         struct mpf_intel *mpf_new;
894                         /* steal 16 bytes from [0, 1k) */
895                         printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
896                         mpf_new = phys_to_virt(0x400 - 16);
897                         memcpy(mpf_new, mpf, 16);
898                         mpf = mpf_new;
899                         mpf->physptr = mpc_new_phys;
900                 }
901                 mpf->checksum = 0;
902                 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
903                 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
904         }
905 
906         /*
907          * only replace the one with mp_INT and
908          *       MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
909          * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
910          * may need pci=routeirq for all coverage
911          */
912         replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
913 
914         return 0;
915 }
916 
917 late_initcall(update_mp_table);
918 

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