2 * Intel Multiprocessor Specification 1.1 and 1.4
3 * compliant MP-table parsing routines.
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>
11 #include <linux/init.h>
12 #include <linux/delay.h>
13 #include <linux/bootmem.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/mc146818rtc.h>
16 #include <linux/bitops.h>
17 #include <linux/acpi.h>
18 #include <linux/module.h>
19 #include <linux/smp.h>
22 #include <asm/mpspec.h>
23 #include <asm/pgalloc.h>
24 #include <asm/io_apic.h>
25 #include <asm/proto.h>
26 #include <asm/bios_ebda.h>
28 #include <asm/trampoline.h>
29 #include <asm/setup.h>
34 * Checksum an MP configuration block.
37 static int __init mpf_checksum(unsigned char *mp, int len)
47 static void __init MP_processor_info(struct mpc_cpu *m)
50 char *bootup_cpu = "";
52 if (!(m->cpuflag & CPU_ENABLED)) {
57 if (x86_quirks->mpc_apic_id)
58 apicid = x86_quirks->mpc_apic_id(m);
62 if (m->cpuflag & CPU_BOOTPROCESSOR) {
63 bootup_cpu = " (Bootup-CPU)";
64 boot_cpu_physical_apicid = m->apicid;
67 printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
68 generic_processor_info(apicid, m->apicver);
71 #ifdef CONFIG_X86_IO_APIC
72 static void __init MP_bus_info(struct mpc_bus *m)
75 memcpy(str, m->bustype, 6);
78 if (x86_quirks->mpc_oem_bus_info)
79 x86_quirks->mpc_oem_bus_info(m, str);
81 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
83 #if MAX_MP_BUSSES < 256
84 if (m->busid >= MAX_MP_BUSSES) {
85 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
86 " is too large, max. supported is %d\n",
87 m->busid, str, MAX_MP_BUSSES - 1);
92 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
93 set_bit(m->busid, mp_bus_not_pci);
94 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
95 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
97 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
98 if (x86_quirks->mpc_oem_pci_bus)
99 x86_quirks->mpc_oem_pci_bus(m);
101 clear_bit(m->busid, mp_bus_not_pci);
102 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
103 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
104 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
105 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
106 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
107 mp_bus_id_to_type[m->busid] = MP_BUS_MCA;
110 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
114 #ifdef CONFIG_X86_IO_APIC
116 static int bad_ioapic(unsigned long address)
118 if (nr_ioapics >= MAX_IO_APICS) {
119 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
120 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
121 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
124 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
125 " found in table, skipping!\n");
131 static void __init MP_ioapic_info(struct mpc_ioapic *m)
133 if (!(m->flags & MPC_APIC_USABLE))
136 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
137 m->apicid, m->apicver, m->apicaddr);
139 if (bad_ioapic(m->apicaddr))
142 mp_ioapics[nr_ioapics].apicaddr = m->apicaddr;
143 mp_ioapics[nr_ioapics].apicid = m->apicid;
144 mp_ioapics[nr_ioapics].type = m->type;
145 mp_ioapics[nr_ioapics].apicver = m->apicver;
146 mp_ioapics[nr_ioapics].flags = m->flags;
150 static void print_MP_intsrc_info(struct mpc_intsrc *m)
152 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
153 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
154 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
155 m->srcbusirq, m->dstapic, m->dstirq);
158 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
160 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
161 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
162 mp_irq->irqtype, mp_irq->irqflag & 3,
163 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
164 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
167 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
168 struct mpc_intsrc *mp_irq)
170 mp_irq->dstapic = m->dstapic;
171 mp_irq->type = m->type;
172 mp_irq->irqtype = m->irqtype;
173 mp_irq->irqflag = m->irqflag;
174 mp_irq->srcbus = m->srcbus;
175 mp_irq->srcbusirq = m->srcbusirq;
176 mp_irq->dstirq = m->dstirq;
179 static void __init assign_to_mpc_intsrc(struct mpc_intsrc *mp_irq,
180 struct mpc_intsrc *m)
182 m->dstapic = mp_irq->dstapic;
183 m->type = mp_irq->type;
184 m->irqtype = mp_irq->irqtype;
185 m->irqflag = mp_irq->irqflag;
186 m->srcbus = mp_irq->srcbus;
187 m->srcbusirq = mp_irq->srcbusirq;
188 m->dstirq = mp_irq->dstirq;
191 static int __init mp_irq_mpc_intsrc_cmp(struct mpc_intsrc *mp_irq,
192 struct mpc_intsrc *m)
194 if (mp_irq->dstapic != m->dstapic)
196 if (mp_irq->type != m->type)
198 if (mp_irq->irqtype != m->irqtype)
200 if (mp_irq->irqflag != m->irqflag)
202 if (mp_irq->srcbus != m->srcbus)
204 if (mp_irq->srcbusirq != m->srcbusirq)
206 if (mp_irq->dstirq != m->dstirq)
212 static void __init MP_intsrc_info(struct mpc_intsrc *m)
216 print_MP_intsrc_info(m);
218 for (i = 0; i < mp_irq_entries; i++) {
219 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
223 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
224 if (++mp_irq_entries == MAX_IRQ_SOURCES)
225 panic("Max # of irq sources exceeded!!\n");
230 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
232 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
233 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
234 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
235 m->srcbusirq, m->destapic, m->destapiclint);
242 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
245 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
246 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
247 mpc->signature[0], mpc->signature[1],
248 mpc->signature[2], mpc->signature[3]);
251 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
252 printk(KERN_ERR "MPTABLE: checksum error!\n");
255 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
256 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
261 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
264 memcpy(oem, mpc->oem, 8);
266 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
268 memcpy(str, mpc->productid, 12);
271 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
273 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
278 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
283 int count = sizeof(*mpc);
284 unsigned char *mpt = ((unsigned char *)mpc) + count;
286 if (!smp_check_mpc(mpc, oem, str))
290 generic_mps_oem_check(mpc, oem, str);
292 /* save the local APIC address, it might be non-default */
294 mp_lapic_addr = mpc->lapic;
299 if (mpc->oemptr && x86_quirks->smp_read_mpc_oem) {
300 struct mpc_oemtable *oem_table = (void *)(long)mpc->oemptr;
301 x86_quirks->smp_read_mpc_oem(oem_table, mpc->oemsize);
305 * Now process the configuration blocks.
307 if (x86_quirks->mpc_record)
308 *x86_quirks->mpc_record = 0;
310 while (count < mpc->length) {
314 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
315 /* ACPI may have already provided this data */
317 MP_processor_info(m);
324 struct mpc_bus *m = (struct mpc_bus *)mpt;
325 #ifdef CONFIG_X86_IO_APIC
334 #ifdef CONFIG_X86_IO_APIC
335 struct mpc_ioapic *m = (struct mpc_ioapic *)mpt;
338 mpt += sizeof(struct mpc_ioapic);
339 count += sizeof(struct mpc_ioapic);
344 #ifdef CONFIG_X86_IO_APIC
345 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
349 mpt += sizeof(struct mpc_intsrc);
350 count += sizeof(struct mpc_intsrc);
355 struct mpc_lintsrc *m =
356 (struct mpc_lintsrc *)mpt;
364 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
365 printk(KERN_ERR "type %x\n", *mpt);
366 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
367 1, mpc, mpc->length, 1);
371 if (x86_quirks->mpc_record)
372 (*x86_quirks->mpc_record)++;
375 #ifdef CONFIG_X86_BIGSMP
376 generic_bigsmp_probe();
379 if (apic->setup_apic_routing)
380 apic->setup_apic_routing();
383 printk(KERN_ERR "MPTABLE: no processors registered!\n");
384 return num_processors;
387 #ifdef CONFIG_X86_IO_APIC
389 static int __init ELCR_trigger(unsigned int irq)
393 port = 0x4d0 + (irq >> 3);
394 return (inb(port) >> (irq & 7)) & 1;
397 static void __init construct_default_ioirq_mptable(int mpc_default_type)
399 struct mpc_intsrc intsrc;
401 int ELCR_fallback = 0;
403 intsrc.type = MP_INTSRC;
404 intsrc.irqflag = 0; /* conforming */
406 intsrc.dstapic = mp_ioapics[0].apicid;
408 intsrc.irqtype = mp_INT;
411 * If true, we have an ISA/PCI system with no IRQ entries
412 * in the MP table. To prevent the PCI interrupts from being set up
413 * incorrectly, we try to use the ELCR. The sanity check to see if
414 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
415 * never be level sensitive, so we simply see if the ELCR agrees.
416 * If it does, we assume it's valid.
418 if (mpc_default_type == 5) {
419 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
420 "falling back to ELCR\n");
422 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
424 printk(KERN_ERR "ELCR contains invalid data... "
428 "Using ELCR to identify PCI interrupts\n");
433 for (i = 0; i < 16; i++) {
434 switch (mpc_default_type) {
436 if (i == 0 || i == 13)
437 continue; /* IRQ0 & IRQ13 not connected */
441 continue; /* IRQ2 is never connected */
446 * If the ELCR indicates a level-sensitive interrupt, we
447 * copy that information over to the MP table in the
448 * irqflag field (level sensitive, active high polarity).
456 intsrc.srcbusirq = i;
457 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
458 MP_intsrc_info(&intsrc);
461 intsrc.irqtype = mp_ExtINT;
462 intsrc.srcbusirq = 0;
463 intsrc.dstirq = 0; /* 8259A to INTIN0 */
464 MP_intsrc_info(&intsrc);
468 static void __init construct_ioapic_table(int mpc_default_type)
470 struct mpc_ioapic ioapic;
475 switch (mpc_default_type) {
477 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
482 memcpy(bus.bustype, "ISA ", 6);
487 memcpy(bus.bustype, "EISA ", 6);
491 memcpy(bus.bustype, "MCA ", 6);
494 if (mpc_default_type > 4) {
496 memcpy(bus.bustype, "PCI ", 6);
500 ioapic.type = MP_IOAPIC;
502 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
503 ioapic.flags = MPC_APIC_USABLE;
504 ioapic.apicaddr = 0xFEC00000;
505 MP_ioapic_info(&ioapic);
508 * We set up most of the low 16 IO-APIC pins according to MPS rules.
510 construct_default_ioirq_mptable(mpc_default_type);
513 static inline void __init construct_ioapic_table(int mpc_default_type) { }
516 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
518 struct mpc_cpu processor;
519 struct mpc_lintsrc lintsrc;
520 int linttypes[2] = { mp_ExtINT, mp_NMI };
524 * local APIC has default address
526 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
529 * 2 CPUs, numbered 0 & 1.
531 processor.type = MP_PROCESSOR;
532 /* Either an integrated APIC or a discrete 82489DX. */
533 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
534 processor.cpuflag = CPU_ENABLED;
535 processor.cpufeature = (boot_cpu_data.x86 << 8) |
536 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
537 processor.featureflag = boot_cpu_data.x86_capability[0];
538 processor.reserved[0] = 0;
539 processor.reserved[1] = 0;
540 for (i = 0; i < 2; i++) {
541 processor.apicid = i;
542 MP_processor_info(&processor);
545 construct_ioapic_table(mpc_default_type);
547 lintsrc.type = MP_LINTSRC;
548 lintsrc.irqflag = 0; /* conforming */
549 lintsrc.srcbusid = 0;
550 lintsrc.srcbusirq = 0;
551 lintsrc.destapic = MP_APIC_ALL;
552 for (i = 0; i < 2; i++) {
553 lintsrc.irqtype = linttypes[i];
554 lintsrc.destapiclint = i;
555 MP_lintsrc_info(&lintsrc);
559 static struct mpf_intel *mpf_found;
561 static unsigned long __init get_mpc_size(unsigned long physptr)
563 struct mpc_table *mpc;
566 mpc = early_ioremap(physptr, PAGE_SIZE);
568 early_iounmap(mpc, PAGE_SIZE);
569 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
575 * Scan the memory blocks for an SMP configuration block.
577 static void __init __get_smp_config(unsigned int early)
579 struct mpf_intel *mpf = mpf_found;
584 if (acpi_lapic && early)
588 * MPS doesn't support hyperthreading, aka only have
589 * thread 0 apic id in MPS table
591 if (acpi_lapic && acpi_ioapic)
594 if (x86_quirks->mach_get_smp_config) {
595 if (x86_quirks->mach_get_smp_config(early))
599 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
601 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
602 if (mpf->feature2 & (1 << 7)) {
603 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
606 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
611 * Now see if we need to read further.
613 if (mpf->feature1 != 0) {
616 * local APIC has default address
618 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
622 printk(KERN_INFO "Default MP configuration #%d\n",
624 construct_default_ISA_mptable(mpf->feature1);
626 } else if (mpf->physptr) {
627 struct mpc_table *mpc;
630 size = get_mpc_size(mpf->physptr);
631 mpc = early_ioremap(mpf->physptr, size);
633 * Read the physical hardware table. Anything here will
634 * override the defaults.
636 if (!smp_read_mpc(mpc, early)) {
637 #ifdef CONFIG_X86_LOCAL_APIC
638 smp_found_config = 0;
641 "BIOS bug, MP table errors detected!...\n");
642 printk(KERN_ERR "... disabling SMP support. "
643 "(tell your hw vendor)\n");
644 early_iounmap(mpc, size);
647 early_iounmap(mpc, size);
651 #ifdef CONFIG_X86_IO_APIC
653 * If there are no explicit MP IRQ entries, then we are
654 * broken. We set up most of the low 16 IO-APIC pins to
655 * ISA defaults and hope it will work.
657 if (!mp_irq_entries) {
660 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
661 "using default mptable. "
662 "(tell your hw vendor)\n");
666 memcpy(bus.bustype, "ISA ", 6);
669 construct_default_ioirq_mptable(0);
676 printk(KERN_INFO "Processors: %d\n", num_processors);
678 * Only use the first configuration found.
682 void __init early_get_smp_config(void)
687 void __init get_smp_config(void)
692 static int __init smp_scan_config(unsigned long base, unsigned long length,
695 unsigned int *bp = phys_to_virt(base);
696 struct mpf_intel *mpf;
698 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
700 BUILD_BUG_ON(sizeof(*mpf) != 16);
703 mpf = (struct mpf_intel *)bp;
704 if ((*bp == SMP_MAGIC_IDENT) &&
705 (mpf->length == 1) &&
706 !mpf_checksum((unsigned char *)bp, 16) &&
707 ((mpf->specification == 1)
708 || (mpf->specification == 4))) {
709 #ifdef CONFIG_X86_LOCAL_APIC
710 smp_found_config = 1;
714 printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
715 mpf, (u64)virt_to_phys(mpf));
719 reserve_bootmem_generic(virt_to_phys(mpf), sizeof(*mpf),
722 unsigned long size = get_mpc_size(mpf->physptr);
725 * We cannot access to MPC table to compute
726 * table size yet, as only few megabytes from
727 * the bottom is mapped now.
728 * PC-9800's MPC table places on the very last
729 * of physical memory; so that simply reserving
730 * PAGE_SIZE from mpf->physptr yields BUG()
731 * in reserve_bootmem.
732 * also need to make sure physptr is below than
734 * we don't need reserve the area above max_low_pfn
736 unsigned long end = max_low_pfn * PAGE_SIZE;
738 if (mpf->physptr < end) {
739 if (mpf->physptr + size > end)
740 size = end - mpf->physptr;
741 reserve_bootmem_generic(mpf->physptr, size,
745 reserve_bootmem_generic(mpf->physptr, size,
758 static void __init __find_smp_config(unsigned int reserve)
760 unsigned int address;
762 if (x86_quirks->mach_find_smp_config) {
763 if (x86_quirks->mach_find_smp_config(reserve))
767 * FIXME: Linux assumes you have 640K of base ram..
768 * this continues the error...
770 * 1) Scan the bottom 1K for a signature
771 * 2) Scan the top 1K of base RAM
772 * 3) Scan the 64K of bios
774 if (smp_scan_config(0x0, 0x400, reserve) ||
775 smp_scan_config(639 * 0x400, 0x400, reserve) ||
776 smp_scan_config(0xF0000, 0x10000, reserve))
779 * If it is an SMP machine we should know now, unless the
780 * configuration is in an EISA/MCA bus machine with an
781 * extended bios data area.
783 * there is a real-mode segmented pointer pointing to the
784 * 4K EBDA area at 0x40E, calculate and scan it here.
786 * NOTE! There are Linux loaders that will corrupt the EBDA
787 * area, and as such this kind of SMP config may be less
788 * trustworthy, simply because the SMP table may have been
789 * stomped on during early boot. These loaders are buggy and
792 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
795 address = get_bios_ebda();
797 smp_scan_config(address, 0x400, reserve);
800 void __init early_find_smp_config(void)
802 __find_smp_config(0);
805 void __init find_smp_config(void)
807 __find_smp_config(1);
810 #ifdef CONFIG_X86_IO_APIC
811 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
813 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
817 if (m->irqtype != mp_INT)
820 if (m->irqflag != 0x0f)
825 for (i = 0; i < mp_irq_entries; i++) {
826 if (mp_irqs[i].irqtype != mp_INT)
829 if (mp_irqs[i].irqflag != 0x0f)
832 if (mp_irqs[i].srcbus != m->srcbus)
834 if (mp_irqs[i].srcbusirq != m->srcbusirq)
837 /* already claimed */
848 #define SPARE_SLOT_NUM 20
850 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
853 static int __init replace_intsrc_all(struct mpc_table *mpc,
854 unsigned long mpc_new_phys,
855 unsigned long mpc_new_length)
857 #ifdef CONFIG_X86_IO_APIC
862 int count = sizeof(*mpc);
863 unsigned char *mpt = ((unsigned char *)mpc) + count;
865 printk(KERN_INFO "mpc_length %x\n", mpc->length);
866 while (count < mpc->length) {
870 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
877 struct mpc_bus *m = (struct mpc_bus *)mpt;
884 mpt += sizeof(struct mpc_ioapic);
885 count += sizeof(struct mpc_ioapic);
890 #ifdef CONFIG_X86_IO_APIC
891 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
893 apic_printk(APIC_VERBOSE, "OLD ");
894 print_MP_intsrc_info(m);
895 i = get_MP_intsrc_index(m);
897 assign_to_mpc_intsrc(&mp_irqs[i], m);
898 apic_printk(APIC_VERBOSE, "NEW ");
899 print_mp_irq_info(&mp_irqs[i]);
901 /* legacy, do nothing */
902 } else if (nr_m_spare < SPARE_SLOT_NUM) {
904 * not found (-1), or duplicated (-2)
905 * are invalid entries,
906 * we need to use the slot later
908 m_spare[nr_m_spare] = m;
912 mpt += sizeof(struct mpc_intsrc);
913 count += sizeof(struct mpc_intsrc);
918 struct mpc_lintsrc *m =
919 (struct mpc_lintsrc *)mpt;
926 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
927 printk(KERN_ERR "type %x\n", *mpt);
928 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
929 1, mpc, mpc->length, 1);
934 #ifdef CONFIG_X86_IO_APIC
935 for (i = 0; i < mp_irq_entries; i++) {
939 if (mp_irqs[i].irqtype != mp_INT)
942 if (mp_irqs[i].irqflag != 0x0f)
945 if (nr_m_spare > 0) {
946 apic_printk(APIC_VERBOSE, "*NEW* found\n");
948 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
949 m_spare[nr_m_spare] = NULL;
951 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
952 count += sizeof(struct mpc_intsrc);
954 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
956 if (count <= mpc_new_length)
957 printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
959 printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
963 assign_to_mpc_intsrc(&mp_irqs[i], m);
965 mpt += sizeof(struct mpc_intsrc);
967 print_mp_irq_info(&mp_irqs[i]);
971 /* update checksum */
973 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
978 static int __initdata enable_update_mptable;
980 static int __init update_mptable_setup(char *str)
982 enable_update_mptable = 1;
985 early_param("update_mptable", update_mptable_setup);
987 static unsigned long __initdata mpc_new_phys;
988 static unsigned long mpc_new_length __initdata = 4096;
990 /* alloc_mptable or alloc_mptable=4k */
991 static int __initdata alloc_mptable;
992 static int __init parse_alloc_mptable_opt(char *p)
994 enable_update_mptable = 1;
998 mpc_new_length = memparse(p, &p);
1001 early_param("alloc_mptable", parse_alloc_mptable_opt);
1003 void __init early_reserve_e820_mpc_new(void)
1005 if (enable_update_mptable && alloc_mptable) {
1007 #ifdef CONFIG_X86_TRAMPOLINE
1008 startt = TRAMPOLINE_BASE;
1010 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1014 static int __init update_mp_table(void)
1018 struct mpf_intel *mpf;
1019 struct mpc_table *mpc, *mpc_new;
1021 if (!enable_update_mptable)
1029 * Now see if we need to go further.
1031 if (mpf->feature1 != 0)
1037 mpc = phys_to_virt(mpf->physptr);
1039 if (!smp_check_mpc(mpc, oem, str))
1042 printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
1043 printk(KERN_INFO "physptr: %x\n", mpf->physptr);
1045 if (mpc_new_phys && mpc->length > mpc_new_length) {
1047 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1051 if (!mpc_new_phys) {
1052 unsigned char old, new;
1053 /* check if we can change the postion */
1055 old = mpf_checksum((unsigned char *)mpc, mpc->length);
1056 mpc->checksum = 0xff;
1057 new = mpf_checksum((unsigned char *)mpc, mpc->length);
1059 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1062 printk(KERN_INFO "use in-positon replacing\n");
1064 mpf->physptr = mpc_new_phys;
1065 mpc_new = phys_to_virt(mpc_new_phys);
1066 memcpy(mpc_new, mpc, mpc->length);
1068 /* check if we can modify that */
1069 if (mpc_new_phys - mpf->physptr) {
1070 struct mpf_intel *mpf_new;
1071 /* steal 16 bytes from [0, 1k) */
1072 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1073 mpf_new = phys_to_virt(0x400 - 16);
1074 memcpy(mpf_new, mpf, 16);
1076 mpf->physptr = mpc_new_phys;
1079 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
1080 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
1084 * only replace the one with mp_INT and
1085 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1086 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1087 * may need pci=routeirq for all coverage
1089 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1094 late_initcall(update_mp_table);