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>
20 #include <linux/pci.h>
23 #include <asm/mpspec.h>
24 #include <asm/pgalloc.h>
25 #include <asm/io_apic.h>
26 #include <asm/proto.h>
27 #include <asm/bios_ebda.h>
29 #include <asm/trampoline.h>
30 #include <asm/setup.h>
35 * Checksum an MP configuration block.
38 static int __init mpf_checksum(unsigned char *mp, int len)
48 int __init default_mpc_apic_id(struct mpc_cpu *m)
53 static void __init MP_processor_info(struct mpc_cpu *m)
56 char *bootup_cpu = "";
58 if (!(m->cpuflag & CPU_ENABLED)) {
63 apicid = x86_init.mpparse.mpc_apic_id(m);
65 if (m->cpuflag & CPU_BOOTPROCESSOR) {
66 bootup_cpu = " (Bootup-CPU)";
67 boot_cpu_physical_apicid = m->apicid;
70 printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
71 generic_processor_info(apicid, m->apicver);
74 #ifdef CONFIG_X86_IO_APIC
75 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
77 memcpy(str, m->bustype, 6);
79 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
82 static void __init MP_bus_info(struct mpc_bus *m)
86 x86_init.mpparse.mpc_oem_bus_info(m, str);
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);
97 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
98 set_bit(m->busid, mp_bus_not_pci);
99 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
100 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
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);
106 clear_bit(m->busid, mp_bus_not_pci);
107 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
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 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
112 mp_bus_id_to_type[m->busid] = MP_BUS_MCA;
115 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
118 static void __init MP_ioapic_info(struct mpc_ioapic *m)
120 if (!(m->flags & MPC_APIC_USABLE))
123 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
124 m->apicid, m->apicver, m->apicaddr);
126 mp_register_ioapic(m->apicid, m->apicaddr, gsi_end + 1);
129 static void print_MP_intsrc_info(struct mpc_intsrc *m)
131 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
132 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
133 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
134 m->srcbusirq, m->dstapic, m->dstirq);
137 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
139 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
140 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
141 mp_irq->irqtype, mp_irq->irqflag & 3,
142 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
143 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
146 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
147 struct mpc_intsrc *mp_irq)
149 mp_irq->dstapic = m->dstapic;
150 mp_irq->type = m->type;
151 mp_irq->irqtype = m->irqtype;
152 mp_irq->irqflag = m->irqflag;
153 mp_irq->srcbus = m->srcbus;
154 mp_irq->srcbusirq = m->srcbusirq;
155 mp_irq->dstirq = m->dstirq;
158 static void __init assign_to_mpc_intsrc(struct mpc_intsrc *mp_irq,
159 struct mpc_intsrc *m)
161 m->dstapic = mp_irq->dstapic;
162 m->type = mp_irq->type;
163 m->irqtype = mp_irq->irqtype;
164 m->irqflag = mp_irq->irqflag;
165 m->srcbus = mp_irq->srcbus;
166 m->srcbusirq = mp_irq->srcbusirq;
167 m->dstirq = mp_irq->dstirq;
170 static int __init mp_irq_mpc_intsrc_cmp(struct mpc_intsrc *mp_irq,
171 struct mpc_intsrc *m)
173 if (mp_irq->dstapic != m->dstapic)
175 if (mp_irq->type != m->type)
177 if (mp_irq->irqtype != m->irqtype)
179 if (mp_irq->irqflag != m->irqflag)
181 if (mp_irq->srcbus != m->srcbus)
183 if (mp_irq->srcbusirq != m->srcbusirq)
185 if (mp_irq->dstirq != m->dstirq)
191 static void __init MP_intsrc_info(struct mpc_intsrc *m)
195 print_MP_intsrc_info(m);
197 for (i = 0; i < mp_irq_entries; i++) {
198 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
202 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
203 if (++mp_irq_entries == MAX_IRQ_SOURCES)
204 panic("Max # of irq sources exceeded!!\n");
206 #else /* CONFIG_X86_IO_APIC */
207 static inline void __init MP_bus_info(struct mpc_bus *m) {}
208 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
209 static inline void __init MP_intsrc_info(struct mpc_intsrc *m) {}
210 #endif /* CONFIG_X86_IO_APIC */
213 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
215 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
216 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
217 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
218 m->srcbusirq, m->destapic, m->destapiclint);
225 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
228 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
229 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
230 mpc->signature[0], mpc->signature[1],
231 mpc->signature[2], mpc->signature[3]);
234 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
235 printk(KERN_ERR "MPTABLE: checksum error!\n");
238 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
239 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
244 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
247 memcpy(oem, mpc->oem, 8);
249 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
251 memcpy(str, mpc->productid, 12);
254 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
256 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
261 static void skip_entry(unsigned char **ptr, int *count, int size)
267 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
269 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
271 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
272 1, mpc, mpc->length, 1);
275 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
277 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
282 int count = sizeof(*mpc);
283 unsigned char *mpt = ((unsigned char *)mpc) + count;
285 if (!smp_check_mpc(mpc, oem, str))
289 generic_mps_oem_check(mpc, oem, str);
291 /* save the local APIC address, it might be non-default */
293 mp_lapic_addr = mpc->lapic;
299 x86_init.mpparse.smp_read_mpc_oem(mpc);
302 * Now process the configuration blocks.
304 x86_init.mpparse.mpc_record(0);
306 while (count < mpc->length) {
309 /* ACPI may have already provided this data */
311 MP_processor_info((struct mpc_cpu *)mpt);
312 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
315 MP_bus_info((struct mpc_bus *)mpt);
316 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
319 MP_ioapic_info((struct mpc_ioapic *)mpt);
320 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
323 MP_intsrc_info((struct mpc_intsrc *)mpt);
324 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
327 MP_lintsrc_info((struct mpc_lintsrc *)mpt);
328 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
332 smp_dump_mptable(mpc, mpt);
336 x86_init.mpparse.mpc_record(1);
340 printk(KERN_ERR "MPTABLE: no processors registered!\n");
341 return num_processors;
344 #ifdef CONFIG_X86_IO_APIC
346 static int __init ELCR_trigger(unsigned int irq)
350 port = 0x4d0 + (irq >> 3);
351 return (inb(port) >> (irq & 7)) & 1;
354 static void __init construct_default_ioirq_mptable(int mpc_default_type)
356 struct mpc_intsrc intsrc;
358 int ELCR_fallback = 0;
360 intsrc.type = MP_INTSRC;
361 intsrc.irqflag = 0; /* conforming */
363 intsrc.dstapic = mp_ioapics[0].apicid;
365 intsrc.irqtype = mp_INT;
368 * If true, we have an ISA/PCI system with no IRQ entries
369 * in the MP table. To prevent the PCI interrupts from being set up
370 * incorrectly, we try to use the ELCR. The sanity check to see if
371 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
372 * never be level sensitive, so we simply see if the ELCR agrees.
373 * If it does, we assume it's valid.
375 if (mpc_default_type == 5) {
376 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
377 "falling back to ELCR\n");
379 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
381 printk(KERN_ERR "ELCR contains invalid data... "
385 "Using ELCR to identify PCI interrupts\n");
390 for (i = 0; i < 16; i++) {
391 switch (mpc_default_type) {
393 if (i == 0 || i == 13)
394 continue; /* IRQ0 & IRQ13 not connected */
398 continue; /* IRQ2 is never connected */
403 * If the ELCR indicates a level-sensitive interrupt, we
404 * copy that information over to the MP table in the
405 * irqflag field (level sensitive, active high polarity).
413 intsrc.srcbusirq = i;
414 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
415 MP_intsrc_info(&intsrc);
418 intsrc.irqtype = mp_ExtINT;
419 intsrc.srcbusirq = 0;
420 intsrc.dstirq = 0; /* 8259A to INTIN0 */
421 MP_intsrc_info(&intsrc);
425 static void __init construct_ioapic_table(int mpc_default_type)
427 struct mpc_ioapic ioapic;
432 switch (mpc_default_type) {
434 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
439 memcpy(bus.bustype, "ISA ", 6);
444 memcpy(bus.bustype, "EISA ", 6);
448 memcpy(bus.bustype, "MCA ", 6);
451 if (mpc_default_type > 4) {
453 memcpy(bus.bustype, "PCI ", 6);
457 ioapic.type = MP_IOAPIC;
459 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
460 ioapic.flags = MPC_APIC_USABLE;
461 ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
462 MP_ioapic_info(&ioapic);
465 * We set up most of the low 16 IO-APIC pins according to MPS rules.
467 construct_default_ioirq_mptable(mpc_default_type);
470 static inline void __init construct_ioapic_table(int mpc_default_type) { }
473 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
475 struct mpc_cpu processor;
476 struct mpc_lintsrc lintsrc;
477 int linttypes[2] = { mp_ExtINT, mp_NMI };
481 * local APIC has default address
483 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
486 * 2 CPUs, numbered 0 & 1.
488 processor.type = MP_PROCESSOR;
489 /* Either an integrated APIC or a discrete 82489DX. */
490 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
491 processor.cpuflag = CPU_ENABLED;
492 processor.cpufeature = (boot_cpu_data.x86 << 8) |
493 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
494 processor.featureflag = boot_cpu_data.x86_capability[0];
495 processor.reserved[0] = 0;
496 processor.reserved[1] = 0;
497 for (i = 0; i < 2; i++) {
498 processor.apicid = i;
499 MP_processor_info(&processor);
502 construct_ioapic_table(mpc_default_type);
504 lintsrc.type = MP_LINTSRC;
505 lintsrc.irqflag = 0; /* conforming */
506 lintsrc.srcbusid = 0;
507 lintsrc.srcbusirq = 0;
508 lintsrc.destapic = MP_APIC_ALL;
509 for (i = 0; i < 2; i++) {
510 lintsrc.irqtype = linttypes[i];
511 lintsrc.destapiclint = i;
512 MP_lintsrc_info(&lintsrc);
516 static struct mpf_intel *mpf_found;
518 static unsigned long __init get_mpc_size(unsigned long physptr)
520 struct mpc_table *mpc;
523 mpc = early_ioremap(physptr, PAGE_SIZE);
525 early_iounmap(mpc, PAGE_SIZE);
526 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
531 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
533 struct mpc_table *mpc;
536 size = get_mpc_size(mpf->physptr);
537 mpc = early_ioremap(mpf->physptr, size);
539 * Read the physical hardware table. Anything here will
540 * override the defaults.
542 if (!smp_read_mpc(mpc, early)) {
543 #ifdef CONFIG_X86_LOCAL_APIC
544 smp_found_config = 0;
546 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
547 "... disabling SMP support. (tell your hw vendor)\n");
548 early_iounmap(mpc, size);
551 early_iounmap(mpc, size);
556 #ifdef CONFIG_X86_IO_APIC
558 * If there are no explicit MP IRQ entries, then we are
559 * broken. We set up most of the low 16 IO-APIC pins to
560 * ISA defaults and hope it will work.
562 if (!mp_irq_entries) {
565 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
566 "using default mptable. (tell your hw vendor)\n");
570 memcpy(bus.bustype, "ISA ", 6);
573 construct_default_ioirq_mptable(0);
581 * Scan the memory blocks for an SMP configuration block.
583 void __init default_get_smp_config(unsigned int early)
585 struct mpf_intel *mpf = mpf_found;
590 if (acpi_lapic && early)
594 * MPS doesn't support hyperthreading, aka only have
595 * thread 0 apic id in MPS table
597 if (acpi_lapic && acpi_ioapic)
600 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
602 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
603 if (mpf->feature2 & (1 << 7)) {
604 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
607 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
612 * Now see if we need to read further.
614 if (mpf->feature1 != 0) {
617 * local APIC has default address
619 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
623 printk(KERN_INFO "Default MP configuration #%d\n",
625 construct_default_ISA_mptable(mpf->feature1);
627 } else if (mpf->physptr) {
628 if (check_physptr(mpf, early))
634 printk(KERN_INFO "Processors: %d\n", num_processors);
636 * Only use the first configuration found.
640 static void __init smp_reserve_memory(struct mpf_intel *mpf)
642 unsigned long size = get_mpc_size(mpf->physptr);
644 reserve_early_overlap_ok(mpf->physptr, mpf->physptr+size, "MP-table mpc");
647 static int __init smp_scan_config(unsigned long base, unsigned long length)
649 unsigned int *bp = phys_to_virt(base);
650 struct mpf_intel *mpf;
653 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
655 BUILD_BUG_ON(sizeof(*mpf) != 16);
658 mpf = (struct mpf_intel *)bp;
659 if ((*bp == SMP_MAGIC_IDENT) &&
660 (mpf->length == 1) &&
661 !mpf_checksum((unsigned char *)bp, 16) &&
662 ((mpf->specification == 1)
663 || (mpf->specification == 4))) {
664 #ifdef CONFIG_X86_LOCAL_APIC
665 smp_found_config = 1;
669 printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
670 mpf, (u64)virt_to_phys(mpf));
672 mem = virt_to_phys(mpf);
673 reserve_early_overlap_ok(mem, mem + sizeof(*mpf), "MP-table mpf");
675 smp_reserve_memory(mpf);
685 void __init default_find_smp_config(void)
687 unsigned int address;
690 * FIXME: Linux assumes you have 640K of base ram..
691 * this continues the error...
693 * 1) Scan the bottom 1K for a signature
694 * 2) Scan the top 1K of base RAM
695 * 3) Scan the 64K of bios
697 if (smp_scan_config(0x0, 0x400) ||
698 smp_scan_config(639 * 0x400, 0x400) ||
699 smp_scan_config(0xF0000, 0x10000))
702 * If it is an SMP machine we should know now, unless the
703 * configuration is in an EISA/MCA bus machine with an
704 * extended bios data area.
706 * there is a real-mode segmented pointer pointing to the
707 * 4K EBDA area at 0x40E, calculate and scan it here.
709 * NOTE! There are Linux loaders that will corrupt the EBDA
710 * area, and as such this kind of SMP config may be less
711 * trustworthy, simply because the SMP table may have been
712 * stomped on during early boot. These loaders are buggy and
715 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
718 address = get_bios_ebda();
720 smp_scan_config(address, 0x400);
723 #ifdef CONFIG_X86_IO_APIC
724 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
726 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
730 if (m->irqtype != mp_INT)
733 if (m->irqflag != 0x0f)
738 for (i = 0; i < mp_irq_entries; i++) {
739 if (mp_irqs[i].irqtype != mp_INT)
742 if (mp_irqs[i].irqflag != 0x0f)
745 if (mp_irqs[i].srcbus != m->srcbus)
747 if (mp_irqs[i].srcbusirq != m->srcbusirq)
750 /* already claimed */
761 #define SPARE_SLOT_NUM 20
763 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
765 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
769 apic_printk(APIC_VERBOSE, "OLD ");
770 print_MP_intsrc_info(m);
772 i = get_MP_intsrc_index(m);
774 assign_to_mpc_intsrc(&mp_irqs[i], m);
775 apic_printk(APIC_VERBOSE, "NEW ");
776 print_mp_irq_info(&mp_irqs[i]);
780 /* legacy, do nothing */
783 if (*nr_m_spare < SPARE_SLOT_NUM) {
785 * not found (-1), or duplicated (-2) are invalid entries,
786 * we need to use the slot later
788 m_spare[*nr_m_spare] = m;
792 #else /* CONFIG_X86_IO_APIC */
794 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
795 #endif /* CONFIG_X86_IO_APIC */
798 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
802 if (!mpc_new_phys || count <= mpc_new_length) {
803 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
810 static int __init replace_intsrc_all(struct mpc_table *mpc,
811 unsigned long mpc_new_phys,
812 unsigned long mpc_new_length)
814 #ifdef CONFIG_X86_IO_APIC
817 int count = sizeof(*mpc);
819 unsigned char *mpt = ((unsigned char *)mpc) + count;
821 printk(KERN_INFO "mpc_length %x\n", mpc->length);
822 while (count < mpc->length) {
825 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
828 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
831 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
834 check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
835 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
838 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
842 smp_dump_mptable(mpc, mpt);
847 #ifdef CONFIG_X86_IO_APIC
848 for (i = 0; i < mp_irq_entries; i++) {
852 if (mp_irqs[i].irqtype != mp_INT)
855 if (mp_irqs[i].irqflag != 0x0f)
858 if (nr_m_spare > 0) {
859 apic_printk(APIC_VERBOSE, "*NEW* found\n");
861 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
862 m_spare[nr_m_spare] = NULL;
864 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
865 count += sizeof(struct mpc_intsrc);
866 if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
868 assign_to_mpc_intsrc(&mp_irqs[i], m);
870 mpt += sizeof(struct mpc_intsrc);
872 print_mp_irq_info(&mp_irqs[i]);
876 /* update checksum */
878 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
883 int enable_update_mptable;
885 static int __init update_mptable_setup(char *str)
887 enable_update_mptable = 1;
893 early_param("update_mptable", update_mptable_setup);
895 static unsigned long __initdata mpc_new_phys;
896 static unsigned long mpc_new_length __initdata = 4096;
898 /* alloc_mptable or alloc_mptable=4k */
899 static int __initdata alloc_mptable;
900 static int __init parse_alloc_mptable_opt(char *p)
902 enable_update_mptable = 1;
909 mpc_new_length = memparse(p, &p);
912 early_param("alloc_mptable", parse_alloc_mptable_opt);
914 void __init early_reserve_e820_mpc_new(void)
916 if (enable_update_mptable && alloc_mptable) {
918 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
922 static int __init update_mp_table(void)
926 struct mpf_intel *mpf;
927 struct mpc_table *mpc, *mpc_new;
929 if (!enable_update_mptable)
937 * Now see if we need to go further.
939 if (mpf->feature1 != 0)
945 mpc = phys_to_virt(mpf->physptr);
947 if (!smp_check_mpc(mpc, oem, str))
950 printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
951 printk(KERN_INFO "physptr: %x\n", mpf->physptr);
953 if (mpc_new_phys && mpc->length > mpc_new_length) {
955 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
960 unsigned char old, new;
961 /* check if we can change the postion */
963 old = mpf_checksum((unsigned char *)mpc, mpc->length);
964 mpc->checksum = 0xff;
965 new = mpf_checksum((unsigned char *)mpc, mpc->length);
967 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
970 printk(KERN_INFO "use in-positon replacing\n");
972 mpf->physptr = mpc_new_phys;
973 mpc_new = phys_to_virt(mpc_new_phys);
974 memcpy(mpc_new, mpc, mpc->length);
976 /* check if we can modify that */
977 if (mpc_new_phys - mpf->physptr) {
978 struct mpf_intel *mpf_new;
979 /* steal 16 bytes from [0, 1k) */
980 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
981 mpf_new = phys_to_virt(0x400 - 16);
982 memcpy(mpf_new, mpf, 16);
984 mpf->physptr = mpc_new_phys;
987 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
988 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
992 * only replace the one with mp_INT and
993 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
994 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
995 * may need pci=routeirq for all coverage
997 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1002 late_initcall(update_mp_table);