2 * Intel Multiprocessor Specification 1.1 and 1.4
3 * compliant MP-table parsing routines.
5 * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
6 * (c) 1998, 1999, 2000 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/acpi.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>
32 #include <mach_apic.h>
34 #include <mach_apicdef.h>
35 #include <mach_mpparse.h>
39 * Checksum an MP configuration block.
42 static int __init mpf_checksum(unsigned char *mp, int len)
52 static void __init MP_processor_info(struct mpc_cpu *m)
55 char *bootup_cpu = "";
57 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
62 if (x86_quirks->mpc_apic_id)
63 apicid = x86_quirks->mpc_apic_id(m);
65 apicid = m->mpc_apicid;
67 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
68 bootup_cpu = " (Bootup-CPU)";
69 boot_cpu_physical_apicid = m->mpc_apicid;
72 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
73 generic_processor_info(apicid, m->mpc_apicver);
76 #ifdef CONFIG_X86_IO_APIC
77 static void __init MP_bus_info(struct mpc_bus *m)
80 memcpy(str, m->mpc_bustype, 6);
83 if (x86_quirks->mpc_oem_bus_info)
84 x86_quirks->mpc_oem_bus_info(m, str);
86 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->mpc_busid, str);
88 #if MAX_MP_BUSSES < 256
89 if (m->mpc_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->mpc_busid, str, MAX_MP_BUSSES - 1);
97 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
98 set_bit(m->mpc_busid, mp_bus_not_pci);
99 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
100 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
102 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
103 if (x86_quirks->mpc_oem_pci_bus)
104 x86_quirks->mpc_oem_pci_bus(m);
106 clear_bit(m->mpc_busid, mp_bus_not_pci);
107 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
108 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
109 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
110 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
111 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
112 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
115 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
119 #ifdef CONFIG_X86_IO_APIC
121 static int bad_ioapic(unsigned long address)
123 if (nr_ioapics >= MAX_IO_APICS) {
124 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
125 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
126 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
129 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
130 " found in table, skipping!\n");
136 static void __init MP_ioapic_info(struct mpc_ioapic *m)
138 if (!(m->flags & MPC_APIC_USABLE))
141 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
142 m->apicid, m->apicver, m->apicaddr);
144 if (bad_ioapic(m->apicaddr))
147 mp_ioapics[nr_ioapics].mp_apicaddr = m->apicaddr;
148 mp_ioapics[nr_ioapics].mp_apicid = m->apicid;
149 mp_ioapics[nr_ioapics].mp_type = m->type;
150 mp_ioapics[nr_ioapics].mp_apicver = m->apicver;
151 mp_ioapics[nr_ioapics].mp_flags = m->flags;
155 static void print_MP_intsrc_info(struct mpc_intsrc *m)
157 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
158 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
159 m->mpc_irqtype, m->mpc_irqflag & 3,
160 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
161 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
164 static void __init print_mp_irq_info(struct mp_config_intsrc *mp_irq)
166 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
167 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
168 mp_irq->mp_irqtype, mp_irq->mp_irqflag & 3,
169 (mp_irq->mp_irqflag >> 2) & 3, mp_irq->mp_srcbus,
170 mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq);
173 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
174 struct mp_config_intsrc *mp_irq)
176 mp_irq->mp_dstapic = m->mpc_dstapic;
177 mp_irq->mp_type = m->mpc_type;
178 mp_irq->mp_irqtype = m->mpc_irqtype;
179 mp_irq->mp_irqflag = m->mpc_irqflag;
180 mp_irq->mp_srcbus = m->mpc_srcbus;
181 mp_irq->mp_srcbusirq = m->mpc_srcbusirq;
182 mp_irq->mp_dstirq = m->mpc_dstirq;
185 static void __init assign_to_mpc_intsrc(struct mp_config_intsrc *mp_irq,
186 struct mpc_intsrc *m)
188 m->mpc_dstapic = mp_irq->mp_dstapic;
189 m->mpc_type = mp_irq->mp_type;
190 m->mpc_irqtype = mp_irq->mp_irqtype;
191 m->mpc_irqflag = mp_irq->mp_irqflag;
192 m->mpc_srcbus = mp_irq->mp_srcbus;
193 m->mpc_srcbusirq = mp_irq->mp_srcbusirq;
194 m->mpc_dstirq = mp_irq->mp_dstirq;
197 static int __init mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
198 struct mpc_intsrc *m)
200 if (mp_irq->mp_dstapic != m->mpc_dstapic)
202 if (mp_irq->mp_type != m->mpc_type)
204 if (mp_irq->mp_irqtype != m->mpc_irqtype)
206 if (mp_irq->mp_irqflag != m->mpc_irqflag)
208 if (mp_irq->mp_srcbus != m->mpc_srcbus)
210 if (mp_irq->mp_srcbusirq != m->mpc_srcbusirq)
212 if (mp_irq->mp_dstirq != m->mpc_dstirq)
218 static void __init MP_intsrc_info(struct mpc_intsrc *m)
222 print_MP_intsrc_info(m);
224 for (i = 0; i < mp_irq_entries; i++) {
225 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
229 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
230 if (++mp_irq_entries == MAX_IRQ_SOURCES)
231 panic("Max # of irq sources exceeded!!\n");
236 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
238 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
239 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
240 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
241 m->srcbusirq, m->destapic, m->destapiclint);
248 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
251 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
252 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
253 mpc->mpc_signature[0], mpc->mpc_signature[1],
254 mpc->mpc_signature[2], mpc->mpc_signature[3]);
257 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
258 printk(KERN_ERR "MPTABLE: checksum error!\n");
261 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
262 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
266 if (!mpc->mpc_lapic) {
267 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
270 memcpy(oem, mpc->mpc_oem, 8);
272 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
274 memcpy(str, mpc->mpc_productid, 12);
277 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
279 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
284 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
289 int count = sizeof(*mpc);
290 unsigned char *mpt = ((unsigned char *)mpc) + count;
292 if (!smp_check_mpc(mpc, oem, str))
297 * need to make sure summit and es7000's mps_oem_check is safe to be
298 * called early via genericarch 's mps_oem_check
301 #ifdef CONFIG_X86_NUMAQ
302 numaq_mps_oem_check(mpc, oem, str);
305 mps_oem_check(mpc, oem, str);
307 /* save the local APIC address, it might be non-default */
309 mp_lapic_addr = mpc->mpc_lapic;
314 if (mpc->mpc_oemptr && x86_quirks->smp_read_mpc_oem) {
315 struct mpc_oemtable *oem_table = (void *)(long)mpc->mpc_oemptr;
316 x86_quirks->smp_read_mpc_oem(oem_table, mpc->mpc_oemsize);
320 * Now process the configuration blocks.
322 if (x86_quirks->mpc_record)
323 *x86_quirks->mpc_record = 0;
325 while (count < mpc->mpc_length) {
329 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
330 /* ACPI may have already provided this data */
332 MP_processor_info(m);
339 struct mpc_bus *m = (struct mpc_bus *)mpt;
340 #ifdef CONFIG_X86_IO_APIC
349 #ifdef CONFIG_X86_IO_APIC
350 struct mpc_ioapic *m = (struct mpc_ioapic *)mpt;
353 mpt += sizeof(struct mpc_ioapic);
354 count += sizeof(struct mpc_ioapic);
359 #ifdef CONFIG_X86_IO_APIC
360 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
364 mpt += sizeof(struct mpc_intsrc);
365 count += sizeof(struct mpc_intsrc);
370 struct mpc_lintsrc *m =
371 (struct mpc_lintsrc *)mpt;
379 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
380 printk(KERN_ERR "type %x\n", *mpt);
381 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
382 1, mpc, mpc->mpc_length, 1);
383 count = mpc->mpc_length;
386 if (x86_quirks->mpc_record)
387 (*x86_quirks->mpc_record)++;
390 #ifdef CONFIG_X86_GENERICARCH
391 generic_bigsmp_probe();
395 setup_apic_routing();
398 printk(KERN_ERR "MPTABLE: no processors registered!\n");
399 return num_processors;
402 #ifdef CONFIG_X86_IO_APIC
404 static int __init ELCR_trigger(unsigned int irq)
408 port = 0x4d0 + (irq >> 3);
409 return (inb(port) >> (irq & 7)) & 1;
412 static void __init construct_default_ioirq_mptable(int mpc_default_type)
414 struct mpc_intsrc intsrc;
416 int ELCR_fallback = 0;
418 intsrc.mpc_type = MP_INTSRC;
419 intsrc.mpc_irqflag = 0; /* conforming */
420 intsrc.mpc_srcbus = 0;
421 intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
423 intsrc.mpc_irqtype = mp_INT;
426 * If true, we have an ISA/PCI system with no IRQ entries
427 * in the MP table. To prevent the PCI interrupts from being set up
428 * incorrectly, we try to use the ELCR. The sanity check to see if
429 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
430 * never be level sensitive, so we simply see if the ELCR agrees.
431 * If it does, we assume it's valid.
433 if (mpc_default_type == 5) {
434 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
435 "falling back to ELCR\n");
437 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
439 printk(KERN_ERR "ELCR contains invalid data... "
443 "Using ELCR to identify PCI interrupts\n");
448 for (i = 0; i < 16; i++) {
449 switch (mpc_default_type) {
451 if (i == 0 || i == 13)
452 continue; /* IRQ0 & IRQ13 not connected */
456 continue; /* IRQ2 is never connected */
461 * If the ELCR indicates a level-sensitive interrupt, we
462 * copy that information over to the MP table in the
463 * irqflag field (level sensitive, active high polarity).
466 intsrc.mpc_irqflag = 13;
468 intsrc.mpc_irqflag = 0;
471 intsrc.mpc_srcbusirq = i;
472 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
473 MP_intsrc_info(&intsrc);
476 intsrc.mpc_irqtype = mp_ExtINT;
477 intsrc.mpc_srcbusirq = 0;
478 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
479 MP_intsrc_info(&intsrc);
483 static void __init construct_ioapic_table(int mpc_default_type)
485 struct mpc_ioapic ioapic;
488 bus.mpc_type = MP_BUS;
490 switch (mpc_default_type) {
492 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
497 memcpy(bus.mpc_bustype, "ISA ", 6);
502 memcpy(bus.mpc_bustype, "EISA ", 6);
506 memcpy(bus.mpc_bustype, "MCA ", 6);
509 if (mpc_default_type > 4) {
511 memcpy(bus.mpc_bustype, "PCI ", 6);
515 ioapic.type = MP_IOAPIC;
517 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
518 ioapic.flags = MPC_APIC_USABLE;
519 ioapic.apicaddr = 0xFEC00000;
520 MP_ioapic_info(&ioapic);
523 * We set up most of the low 16 IO-APIC pins according to MPS rules.
525 construct_default_ioirq_mptable(mpc_default_type);
528 static inline void __init construct_ioapic_table(int mpc_default_type) { }
531 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
533 struct mpc_cpu processor;
534 struct mpc_lintsrc lintsrc;
535 int linttypes[2] = { mp_ExtINT, mp_NMI };
539 * local APIC has default address
541 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
544 * 2 CPUs, numbered 0 & 1.
546 processor.mpc_type = MP_PROCESSOR;
547 /* Either an integrated APIC or a discrete 82489DX. */
548 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
549 processor.mpc_cpuflag = CPU_ENABLED;
550 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
551 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
552 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
553 processor.mpc_reserved[0] = 0;
554 processor.mpc_reserved[1] = 0;
555 for (i = 0; i < 2; i++) {
556 processor.mpc_apicid = i;
557 MP_processor_info(&processor);
560 construct_ioapic_table(mpc_default_type);
562 lintsrc.type = MP_LINTSRC;
563 lintsrc.irqflag = 0; /* conforming */
564 lintsrc.srcbusid = 0;
565 lintsrc.srcbusirq = 0;
566 lintsrc.destapic = MP_APIC_ALL;
567 for (i = 0; i < 2; i++) {
568 lintsrc.irqtype = linttypes[i];
569 lintsrc.destapiclint = i;
570 MP_lintsrc_info(&lintsrc);
574 static struct intel_mp_floating *mpf_found;
577 * Scan the memory blocks for an SMP configuration block.
579 static void __init __get_smp_config(unsigned int early)
581 struct intel_mp_floating *mpf = mpf_found;
586 if (acpi_lapic && early)
590 * MPS doesn't support hyperthreading, aka only have
591 * thread 0 apic id in MPS table
593 if (acpi_lapic && acpi_ioapic)
596 if (x86_quirks->mach_get_smp_config) {
597 if (x86_quirks->mach_get_smp_config(early))
601 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
602 mpf->mpf_specification);
603 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
604 if (mpf->mpf_feature2 & (1 << 7)) {
605 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
608 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
613 * Now see if we need to read further.
615 if (mpf->mpf_feature1 != 0) {
618 * local APIC has default address
620 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
624 printk(KERN_INFO "Default MP configuration #%d\n",
626 construct_default_ISA_mptable(mpf->mpf_feature1);
628 } else if (mpf->mpf_physptr) {
631 * Read the physical hardware table. Anything here will
632 * override the defaults.
634 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
635 #ifdef CONFIG_X86_LOCAL_APIC
636 smp_found_config = 0;
639 "BIOS bug, MP table errors detected!...\n");
640 printk(KERN_ERR "... disabling SMP support. "
641 "(tell your hw vendor)\n");
647 #ifdef CONFIG_X86_IO_APIC
649 * If there are no explicit MP IRQ entries, then we are
650 * broken. We set up most of the low 16 IO-APIC pins to
651 * ISA defaults and hope it will work.
653 if (!mp_irq_entries) {
656 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
657 "using default mptable. "
658 "(tell your hw vendor)\n");
660 bus.mpc_type = MP_BUS;
662 memcpy(bus.mpc_bustype, "ISA ", 6);
665 construct_default_ioirq_mptable(0);
672 printk(KERN_INFO "Processors: %d\n", num_processors);
674 * Only use the first configuration found.
678 void __init early_get_smp_config(void)
683 void __init get_smp_config(void)
688 static int __init smp_scan_config(unsigned long base, unsigned long length,
691 unsigned int *bp = phys_to_virt(base);
692 struct intel_mp_floating *mpf;
694 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
696 BUILD_BUG_ON(sizeof(*mpf) != 16);
699 mpf = (struct intel_mp_floating *)bp;
700 if ((*bp == SMP_MAGIC_IDENT) &&
701 (mpf->mpf_length == 1) &&
702 !mpf_checksum((unsigned char *)bp, 16) &&
703 ((mpf->mpf_specification == 1)
704 || (mpf->mpf_specification == 4))) {
705 #ifdef CONFIG_X86_LOCAL_APIC
706 smp_found_config = 1;
710 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
711 mpf, virt_to_phys(mpf));
715 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
717 if (mpf->mpf_physptr) {
718 unsigned long size = PAGE_SIZE;
721 * We cannot access to MPC table to compute
722 * table size yet, as only few megabytes from
723 * the bottom is mapped now.
724 * PC-9800's MPC table places on the very last
725 * of physical memory; so that simply reserving
726 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
727 * in reserve_bootmem.
729 unsigned long end = max_low_pfn * PAGE_SIZE;
730 if (mpf->mpf_physptr + size > end)
731 size = end - mpf->mpf_physptr;
733 reserve_bootmem_generic(mpf->mpf_physptr, size,
745 static void __init __find_smp_config(unsigned int reserve)
747 unsigned int address;
749 if (x86_quirks->mach_find_smp_config) {
750 if (x86_quirks->mach_find_smp_config(reserve))
754 * FIXME: Linux assumes you have 640K of base ram..
755 * this continues the error...
757 * 1) Scan the bottom 1K for a signature
758 * 2) Scan the top 1K of base RAM
759 * 3) Scan the 64K of bios
761 if (smp_scan_config(0x0, 0x400, reserve) ||
762 smp_scan_config(639 * 0x400, 0x400, reserve) ||
763 smp_scan_config(0xF0000, 0x10000, reserve))
766 * If it is an SMP machine we should know now, unless the
767 * configuration is in an EISA/MCA bus machine with an
768 * extended bios data area.
770 * there is a real-mode segmented pointer pointing to the
771 * 4K EBDA area at 0x40E, calculate and scan it here.
773 * NOTE! There are Linux loaders that will corrupt the EBDA
774 * area, and as such this kind of SMP config may be less
775 * trustworthy, simply because the SMP table may have been
776 * stomped on during early boot. These loaders are buggy and
779 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
782 address = get_bios_ebda();
784 smp_scan_config(address, 0x400, reserve);
787 void __init early_find_smp_config(void)
789 __find_smp_config(0);
792 void __init find_smp_config(void)
794 __find_smp_config(1);
797 #ifdef CONFIG_X86_IO_APIC
798 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
800 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
804 if (m->mpc_irqtype != mp_INT)
807 if (m->mpc_irqflag != 0x0f)
812 for (i = 0; i < mp_irq_entries; i++) {
813 if (mp_irqs[i].mp_irqtype != mp_INT)
816 if (mp_irqs[i].mp_irqflag != 0x0f)
819 if (mp_irqs[i].mp_srcbus != m->mpc_srcbus)
821 if (mp_irqs[i].mp_srcbusirq != m->mpc_srcbusirq)
824 /* already claimed */
835 #define SPARE_SLOT_NUM 20
837 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
840 static int __init replace_intsrc_all(struct mpc_table *mpc,
841 unsigned long mpc_new_phys,
842 unsigned long mpc_new_length)
844 #ifdef CONFIG_X86_IO_APIC
849 int count = sizeof(*mpc);
850 unsigned char *mpt = ((unsigned char *)mpc) + count;
852 printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
853 while (count < mpc->mpc_length) {
857 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
864 struct mpc_bus *m = (struct mpc_bus *)mpt;
871 mpt += sizeof(struct mpc_ioapic);
872 count += sizeof(struct mpc_ioapic);
877 #ifdef CONFIG_X86_IO_APIC
878 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
880 printk(KERN_INFO "OLD ");
881 print_MP_intsrc_info(m);
882 i = get_MP_intsrc_index(m);
884 assign_to_mpc_intsrc(&mp_irqs[i], m);
885 printk(KERN_INFO "NEW ");
886 print_mp_irq_info(&mp_irqs[i]);
888 /* legacy, do nothing */
889 } else if (nr_m_spare < SPARE_SLOT_NUM) {
891 * not found (-1), or duplicated (-2)
892 * are invalid entries,
893 * we need to use the slot later
895 m_spare[nr_m_spare] = m;
899 mpt += sizeof(struct mpc_intsrc);
900 count += sizeof(struct mpc_intsrc);
905 struct mpc_lintsrc *m =
906 (struct mpc_lintsrc *)mpt;
913 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
914 printk(KERN_ERR "type %x\n", *mpt);
915 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
916 1, mpc, mpc->mpc_length, 1);
921 #ifdef CONFIG_X86_IO_APIC
922 for (i = 0; i < mp_irq_entries; i++) {
926 if (mp_irqs[i].mp_irqtype != mp_INT)
929 if (mp_irqs[i].mp_irqflag != 0x0f)
932 if (nr_m_spare > 0) {
933 printk(KERN_INFO "*NEW* found ");
935 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
936 m_spare[nr_m_spare] = NULL;
938 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
939 count += sizeof(struct mpc_intsrc);
941 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
943 if (count <= mpc_new_length)
944 printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
946 printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
950 assign_to_mpc_intsrc(&mp_irqs[i], m);
951 mpc->mpc_length = count;
952 mpt += sizeof(struct mpc_intsrc);
954 print_mp_irq_info(&mp_irqs[i]);
958 /* update checksum */
959 mpc->mpc_checksum = 0;
960 mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
966 static int __initdata enable_update_mptable;
968 static int __init update_mptable_setup(char *str)
970 enable_update_mptable = 1;
973 early_param("update_mptable", update_mptable_setup);
975 static unsigned long __initdata mpc_new_phys;
976 static unsigned long mpc_new_length __initdata = 4096;
978 /* alloc_mptable or alloc_mptable=4k */
979 static int __initdata alloc_mptable;
980 static int __init parse_alloc_mptable_opt(char *p)
982 enable_update_mptable = 1;
986 mpc_new_length = memparse(p, &p);
989 early_param("alloc_mptable", parse_alloc_mptable_opt);
991 void __init early_reserve_e820_mpc_new(void)
993 if (enable_update_mptable && alloc_mptable) {
995 #ifdef CONFIG_X86_TRAMPOLINE
996 startt = TRAMPOLINE_BASE;
998 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1002 static int __init update_mp_table(void)
1006 struct intel_mp_floating *mpf;
1007 struct mpc_table *mpc, *mpc_new;
1009 if (!enable_update_mptable)
1017 * Now see if we need to go further.
1019 if (mpf->mpf_feature1 != 0)
1022 if (!mpf->mpf_physptr)
1025 mpc = phys_to_virt(mpf->mpf_physptr);
1027 if (!smp_check_mpc(mpc, oem, str))
1030 printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1031 printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
1033 if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
1035 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1039 if (!mpc_new_phys) {
1040 unsigned char old, new;
1041 /* check if we can change the postion */
1042 mpc->mpc_checksum = 0;
1043 old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1044 mpc->mpc_checksum = 0xff;
1045 new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1047 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1050 printk(KERN_INFO "use in-positon replacing\n");
1052 mpf->mpf_physptr = mpc_new_phys;
1053 mpc_new = phys_to_virt(mpc_new_phys);
1054 memcpy(mpc_new, mpc, mpc->mpc_length);
1056 /* check if we can modify that */
1057 if (mpc_new_phys - mpf->mpf_physptr) {
1058 struct intel_mp_floating *mpf_new;
1059 /* steal 16 bytes from [0, 1k) */
1060 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1061 mpf_new = phys_to_virt(0x400 - 16);
1062 memcpy(mpf_new, mpf, 16);
1064 mpf->mpf_physptr = mpc_new_phys;
1066 mpf->mpf_checksum = 0;
1067 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
1068 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
1072 * only replace the one with mp_INT and
1073 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1074 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1075 * may need pci=routeirq for all coverage
1077 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1082 late_initcall(update_mp_table);