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>
22 #include <asm/mpspec.h>
23 #include <asm/pgalloc.h>
24 #include <asm/io_apic.h>
25 #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_config_processor *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_config_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_config_ioapic *m)
138 if (!(m->mpc_flags & MPC_APIC_USABLE))
141 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
142 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
144 if (bad_ioapic(m->mpc_apicaddr))
147 mp_ioapics[nr_ioapics].mp_apicaddr = m->mpc_apicaddr;
148 mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
149 mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
150 mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
151 mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
155 static void print_MP_intsrc_info(struct mpc_config_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_config_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_config_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_config_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_config_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_config_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->mpc_irqtype, m->mpc_irqflag & 3,
241 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
242 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
249 static int __init smp_check_mpc(struct mp_config_table *mpc, char *oem,
253 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
254 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
255 mpc->mpc_signature[0], mpc->mpc_signature[1],
256 mpc->mpc_signature[2], mpc->mpc_signature[3]);
259 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
260 printk(KERN_ERR "MPTABLE: checksum error!\n");
263 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
264 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
268 if (!mpc->mpc_lapic) {
269 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
272 memcpy(oem, mpc->mpc_oem, 8);
274 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
276 memcpy(str, mpc->mpc_productid, 12);
279 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
281 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
286 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
291 int count = sizeof(*mpc);
292 unsigned char *mpt = ((unsigned char *)mpc) + count;
294 if (!smp_check_mpc(mpc, oem, str))
299 * need to make sure summit and es7000's mps_oem_check is safe to be
300 * called early via genericarch 's mps_oem_check
303 #ifdef CONFIG_X86_NUMAQ
304 numaq_mps_oem_check(mpc, oem, str);
307 mps_oem_check(mpc, oem, str);
309 /* save the local APIC address, it might be non-default */
311 mp_lapic_addr = mpc->mpc_lapic;
316 if (mpc->mpc_oemptr && x86_quirks->smp_read_mpc_oem) {
317 struct mp_config_oemtable *oem_table = (struct mp_config_oemtable *)(unsigned long)mpc->mpc_oemptr;
318 x86_quirks->smp_read_mpc_oem(oem_table, mpc->mpc_oemsize);
322 * Now process the configuration blocks.
324 if (x86_quirks->mpc_record)
325 *x86_quirks->mpc_record = 0;
327 while (count < mpc->mpc_length) {
331 struct mpc_config_processor *m =
332 (struct mpc_config_processor *)mpt;
333 /* ACPI may have already provided this data */
335 MP_processor_info(m);
342 struct mpc_config_bus *m =
343 (struct mpc_config_bus *)mpt;
344 #ifdef CONFIG_X86_IO_APIC
353 #ifdef CONFIG_X86_IO_APIC
354 struct mpc_config_ioapic *m =
355 (struct mpc_config_ioapic *)mpt;
358 mpt += sizeof(struct mpc_config_ioapic);
359 count += sizeof(struct mpc_config_ioapic);
364 #ifdef CONFIG_X86_IO_APIC
365 struct mpc_config_intsrc *m =
366 (struct mpc_config_intsrc *)mpt;
370 mpt += sizeof(struct mpc_config_intsrc);
371 count += sizeof(struct mpc_config_intsrc);
376 struct mpc_config_lintsrc *m =
377 (struct mpc_config_lintsrc *)mpt;
385 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
386 printk(KERN_ERR "type %x\n", *mpt);
387 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
388 1, mpc, mpc->mpc_length, 1);
389 count = mpc->mpc_length;
392 if (x86_quirks->mpc_record)
393 (*x86_quirks->mpc_record)++;
396 #ifdef CONFIG_X86_GENERICARCH
397 generic_bigsmp_probe();
401 setup_apic_routing();
404 printk(KERN_ERR "MPTABLE: no processors registered!\n");
405 return num_processors;
408 #ifdef CONFIG_X86_IO_APIC
410 static int __init ELCR_trigger(unsigned int irq)
414 port = 0x4d0 + (irq >> 3);
415 return (inb(port) >> (irq & 7)) & 1;
418 static void __init construct_default_ioirq_mptable(int mpc_default_type)
420 struct mpc_config_intsrc intsrc;
422 int ELCR_fallback = 0;
424 intsrc.mpc_type = MP_INTSRC;
425 intsrc.mpc_irqflag = 0; /* conforming */
426 intsrc.mpc_srcbus = 0;
427 intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
429 intsrc.mpc_irqtype = mp_INT;
432 * If true, we have an ISA/PCI system with no IRQ entries
433 * in the MP table. To prevent the PCI interrupts from being set up
434 * incorrectly, we try to use the ELCR. The sanity check to see if
435 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
436 * never be level sensitive, so we simply see if the ELCR agrees.
437 * If it does, we assume it's valid.
439 if (mpc_default_type == 5) {
440 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
441 "falling back to ELCR\n");
443 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
445 printk(KERN_ERR "ELCR contains invalid data... "
449 "Using ELCR to identify PCI interrupts\n");
454 for (i = 0; i < 16; i++) {
455 switch (mpc_default_type) {
457 if (i == 0 || i == 13)
458 continue; /* IRQ0 & IRQ13 not connected */
462 continue; /* IRQ2 is never connected */
467 * If the ELCR indicates a level-sensitive interrupt, we
468 * copy that information over to the MP table in the
469 * irqflag field (level sensitive, active high polarity).
472 intsrc.mpc_irqflag = 13;
474 intsrc.mpc_irqflag = 0;
477 intsrc.mpc_srcbusirq = i;
478 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
479 MP_intsrc_info(&intsrc);
482 intsrc.mpc_irqtype = mp_ExtINT;
483 intsrc.mpc_srcbusirq = 0;
484 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
485 MP_intsrc_info(&intsrc);
489 static void __init construct_ioapic_table(int mpc_default_type)
491 struct mpc_config_ioapic ioapic;
492 struct mpc_config_bus bus;
494 bus.mpc_type = MP_BUS;
496 switch (mpc_default_type) {
498 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
503 memcpy(bus.mpc_bustype, "ISA ", 6);
508 memcpy(bus.mpc_bustype, "EISA ", 6);
512 memcpy(bus.mpc_bustype, "MCA ", 6);
515 if (mpc_default_type > 4) {
517 memcpy(bus.mpc_bustype, "PCI ", 6);
521 ioapic.mpc_type = MP_IOAPIC;
522 ioapic.mpc_apicid = 2;
523 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
524 ioapic.mpc_flags = MPC_APIC_USABLE;
525 ioapic.mpc_apicaddr = 0xFEC00000;
526 MP_ioapic_info(&ioapic);
529 * We set up most of the low 16 IO-APIC pins according to MPS rules.
531 construct_default_ioirq_mptable(mpc_default_type);
534 static inline void __init construct_ioapic_table(int mpc_default_type) { }
537 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
539 struct mpc_config_processor processor;
540 struct mpc_config_lintsrc lintsrc;
541 int linttypes[2] = { mp_ExtINT, mp_NMI };
545 * local APIC has default address
547 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
550 * 2 CPUs, numbered 0 & 1.
552 processor.mpc_type = MP_PROCESSOR;
553 /* Either an integrated APIC or a discrete 82489DX. */
554 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
555 processor.mpc_cpuflag = CPU_ENABLED;
556 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
557 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
558 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
559 processor.mpc_reserved[0] = 0;
560 processor.mpc_reserved[1] = 0;
561 for (i = 0; i < 2; i++) {
562 processor.mpc_apicid = i;
563 MP_processor_info(&processor);
566 construct_ioapic_table(mpc_default_type);
568 lintsrc.mpc_type = MP_LINTSRC;
569 lintsrc.mpc_irqflag = 0; /* conforming */
570 lintsrc.mpc_srcbusid = 0;
571 lintsrc.mpc_srcbusirq = 0;
572 lintsrc.mpc_destapic = MP_APIC_ALL;
573 for (i = 0; i < 2; i++) {
574 lintsrc.mpc_irqtype = linttypes[i];
575 lintsrc.mpc_destapiclint = i;
576 MP_lintsrc_info(&lintsrc);
580 static struct intel_mp_floating *mpf_found;
583 * Scan the memory blocks for an SMP configuration block.
585 static void __init __get_smp_config(unsigned int early)
587 struct intel_mp_floating *mpf = mpf_found;
592 if (acpi_lapic && early)
596 * MPS doesn't support hyperthreading, aka only have
597 * thread 0 apic id in MPS table
599 if (acpi_lapic && acpi_ioapic)
602 if (x86_quirks->mach_get_smp_config) {
603 if (x86_quirks->mach_get_smp_config(early))
607 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
608 mpf->mpf_specification);
609 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
610 if (mpf->mpf_feature2 & (1 << 7)) {
611 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
614 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
619 * Now see if we need to read further.
621 if (mpf->mpf_feature1 != 0) {
624 * local APIC has default address
626 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
630 printk(KERN_INFO "Default MP configuration #%d\n",
632 construct_default_ISA_mptable(mpf->mpf_feature1);
634 } else if (mpf->mpf_physptr) {
637 * Read the physical hardware table. Anything here will
638 * override the defaults.
640 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
641 #ifdef CONFIG_X86_LOCAL_APIC
642 smp_found_config = 0;
645 "BIOS bug, MP table errors detected!...\n");
646 printk(KERN_ERR "... disabling SMP support. "
647 "(tell your hw vendor)\n");
653 #ifdef CONFIG_X86_IO_APIC
655 * If there are no explicit MP IRQ entries, then we are
656 * broken. We set up most of the low 16 IO-APIC pins to
657 * ISA defaults and hope it will work.
659 if (!mp_irq_entries) {
660 struct mpc_config_bus bus;
662 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
663 "using default mptable. "
664 "(tell your hw vendor)\n");
666 bus.mpc_type = MP_BUS;
668 memcpy(bus.mpc_bustype, "ISA ", 6);
671 construct_default_ioirq_mptable(0);
678 printk(KERN_INFO "Processors: %d\n", num_processors);
680 * Only use the first configuration found.
684 void __init early_get_smp_config(void)
689 void __init get_smp_config(void)
694 static int __init smp_scan_config(unsigned long base, unsigned long length,
697 unsigned int *bp = phys_to_virt(base);
698 struct intel_mp_floating *mpf;
700 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
702 BUILD_BUG_ON(sizeof(*mpf) != 16);
705 mpf = (struct intel_mp_floating *)bp;
706 if ((*bp == SMP_MAGIC_IDENT) &&
707 (mpf->mpf_length == 1) &&
708 !mpf_checksum((unsigned char *)bp, 16) &&
709 ((mpf->mpf_specification == 1)
710 || (mpf->mpf_specification == 4))) {
711 #ifdef CONFIG_X86_LOCAL_APIC
712 smp_found_config = 1;
716 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
717 mpf, virt_to_phys(mpf));
721 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
723 if (mpf->mpf_physptr) {
724 unsigned long size = PAGE_SIZE;
727 * We cannot access to MPC table to compute
728 * table size yet, as only few megabytes from
729 * the bottom is mapped now.
730 * PC-9800's MPC table places on the very last
731 * of physical memory; so that simply reserving
732 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
733 * in reserve_bootmem.
735 unsigned long end = max_low_pfn * PAGE_SIZE;
736 if (mpf->mpf_physptr + size > end)
737 size = end - mpf->mpf_physptr;
739 reserve_bootmem_generic(mpf->mpf_physptr, size,
751 static void __init __find_smp_config(unsigned int reserve)
753 unsigned int address;
755 if (x86_quirks->mach_find_smp_config) {
756 if (x86_quirks->mach_find_smp_config(reserve))
760 * FIXME: Linux assumes you have 640K of base ram..
761 * this continues the error...
763 * 1) Scan the bottom 1K for a signature
764 * 2) Scan the top 1K of base RAM
765 * 3) Scan the 64K of bios
767 if (smp_scan_config(0x0, 0x400, reserve) ||
768 smp_scan_config(639 * 0x400, 0x400, reserve) ||
769 smp_scan_config(0xF0000, 0x10000, reserve))
772 * If it is an SMP machine we should know now, unless the
773 * configuration is in an EISA/MCA bus machine with an
774 * extended bios data area.
776 * there is a real-mode segmented pointer pointing to the
777 * 4K EBDA area at 0x40E, calculate and scan it here.
779 * NOTE! There are Linux loaders that will corrupt the EBDA
780 * area, and as such this kind of SMP config may be less
781 * trustworthy, simply because the SMP table may have been
782 * stomped on during early boot. These loaders are buggy and
785 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
788 address = get_bios_ebda();
790 smp_scan_config(address, 0x400, reserve);
793 void __init early_find_smp_config(void)
795 __find_smp_config(0);
798 void __init find_smp_config(void)
800 __find_smp_config(1);
803 #ifdef CONFIG_X86_IO_APIC
804 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
806 static int __init get_MP_intsrc_index(struct mpc_config_intsrc *m)
810 if (m->mpc_irqtype != mp_INT)
813 if (m->mpc_irqflag != 0x0f)
818 for (i = 0; i < mp_irq_entries; i++) {
819 if (mp_irqs[i].mp_irqtype != mp_INT)
822 if (mp_irqs[i].mp_irqflag != 0x0f)
825 if (mp_irqs[i].mp_srcbus != m->mpc_srcbus)
827 if (mp_irqs[i].mp_srcbusirq != m->mpc_srcbusirq)
830 /* already claimed */
841 #define SPARE_SLOT_NUM 20
843 static struct mpc_config_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
846 static int __init replace_intsrc_all(struct mp_config_table *mpc,
847 unsigned long mpc_new_phys,
848 unsigned long mpc_new_length)
850 #ifdef CONFIG_X86_IO_APIC
855 int count = sizeof(*mpc);
856 unsigned char *mpt = ((unsigned char *)mpc) + count;
858 printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
859 while (count < mpc->mpc_length) {
863 struct mpc_config_processor *m =
864 (struct mpc_config_processor *)mpt;
871 struct mpc_config_bus *m =
872 (struct mpc_config_bus *)mpt;
879 mpt += sizeof(struct mpc_config_ioapic);
880 count += sizeof(struct mpc_config_ioapic);
885 #ifdef CONFIG_X86_IO_APIC
886 struct mpc_config_intsrc *m =
887 (struct mpc_config_intsrc *)mpt;
889 printk(KERN_INFO "OLD ");
890 print_MP_intsrc_info(m);
891 i = get_MP_intsrc_index(m);
893 assign_to_mpc_intsrc(&mp_irqs[i], m);
894 printk(KERN_INFO "NEW ");
895 print_mp_irq_info(&mp_irqs[i]);
897 /* legacy, do nothing */
898 } else if (nr_m_spare < SPARE_SLOT_NUM) {
900 * not found (-1), or duplicated (-2)
901 * are invalid entries,
902 * we need to use the slot later
904 m_spare[nr_m_spare] = m;
908 mpt += sizeof(struct mpc_config_intsrc);
909 count += sizeof(struct mpc_config_intsrc);
914 struct mpc_config_lintsrc *m =
915 (struct mpc_config_lintsrc *)mpt;
922 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
923 printk(KERN_ERR "type %x\n", *mpt);
924 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
925 1, mpc, mpc->mpc_length, 1);
930 #ifdef CONFIG_X86_IO_APIC
931 for (i = 0; i < mp_irq_entries; i++) {
935 if (mp_irqs[i].mp_irqtype != mp_INT)
938 if (mp_irqs[i].mp_irqflag != 0x0f)
941 if (nr_m_spare > 0) {
942 printk(KERN_INFO "*NEW* found ");
944 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
945 m_spare[nr_m_spare] = NULL;
947 struct mpc_config_intsrc *m =
948 (struct mpc_config_intsrc *)mpt;
949 count += sizeof(struct mpc_config_intsrc);
951 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
953 if (count <= mpc_new_length)
954 printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
956 printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
960 assign_to_mpc_intsrc(&mp_irqs[i], m);
961 mpc->mpc_length = count;
962 mpt += sizeof(struct mpc_config_intsrc);
964 print_mp_irq_info(&mp_irqs[i]);
968 /* update checksum */
969 mpc->mpc_checksum = 0;
970 mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
976 static int __initdata enable_update_mptable;
978 static int __init update_mptable_setup(char *str)
980 enable_update_mptable = 1;
983 early_param("update_mptable", update_mptable_setup);
985 static unsigned long __initdata mpc_new_phys;
986 static unsigned long mpc_new_length __initdata = 4096;
988 /* alloc_mptable or alloc_mptable=4k */
989 static int __initdata alloc_mptable;
990 static int __init parse_alloc_mptable_opt(char *p)
992 enable_update_mptable = 1;
996 mpc_new_length = memparse(p, &p);
999 early_param("alloc_mptable", parse_alloc_mptable_opt);
1001 void __init early_reserve_e820_mpc_new(void)
1003 if (enable_update_mptable && alloc_mptable) {
1005 #ifdef CONFIG_X86_TRAMPOLINE
1006 startt = TRAMPOLINE_BASE;
1008 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1012 static int __init update_mp_table(void)
1016 struct intel_mp_floating *mpf;
1017 struct mp_config_table *mpc;
1018 struct mp_config_table *mpc_new;
1020 if (!enable_update_mptable)
1028 * Now see if we need to go further.
1030 if (mpf->mpf_feature1 != 0)
1033 if (!mpf->mpf_physptr)
1036 mpc = phys_to_virt(mpf->mpf_physptr);
1038 if (!smp_check_mpc(mpc, oem, str))
1041 printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1042 printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
1044 if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
1046 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1050 if (!mpc_new_phys) {
1051 unsigned char old, new;
1052 /* check if we can change the postion */
1053 mpc->mpc_checksum = 0;
1054 old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1055 mpc->mpc_checksum = 0xff;
1056 new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1058 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1061 printk(KERN_INFO "use in-positon replacing\n");
1063 mpf->mpf_physptr = mpc_new_phys;
1064 mpc_new = phys_to_virt(mpc_new_phys);
1065 memcpy(mpc_new, mpc, mpc->mpc_length);
1067 /* check if we can modify that */
1068 if (mpc_new_phys - mpf->mpf_physptr) {
1069 struct intel_mp_floating *mpf_new;
1070 /* steal 16 bytes from [0, 1k) */
1071 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1072 mpf_new = phys_to_virt(0x400 - 16);
1073 memcpy(mpf_new, mpf, 16);
1075 mpf->mpf_physptr = mpc_new_phys;
1077 mpf->mpf_checksum = 0;
1078 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
1079 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
1083 * only replace the one with mp_INT and
1084 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1085 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1086 * may need pci=routeirq for all coverage
1088 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1093 late_initcall(update_mp_table);