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>
9 * Erich Boleyn : MP v1.4 and additional changes.
10 * Alan Cox : Added EBDA scanning
11 * Ingo Molnar : various cleanups and rewrites
12 * Maciej W. Rozycki: Bits for default MP configurations
13 * Paul Diefenbaugh: Added full ACPI support
17 #include <linux/init.h>
18 #include <linux/acpi.h>
19 #include <linux/delay.h>
20 #include <linux/bootmem.h>
21 #include <linux/smp_lock.h>
22 #include <linux/kernel_stat.h>
23 #include <linux/mc146818rtc.h>
24 #include <linux/bitops.h>
29 #include <asm/mpspec.h>
30 #include <asm/io_apic.h>
32 #include <mach_apic.h>
33 #include <mach_apicdef.h>
34 #include <mach_mpparse.h>
35 #include <bios_ebda.h>
37 /* Have we found an MP table */
39 unsigned int __initdata maxcpus = NR_CPUS;
42 * Various Linux-internal data structures created from the
45 int apic_version [MAX_APICS];
46 int mp_bus_id_to_type [MAX_MP_BUSSES];
47 int mp_bus_id_to_node [MAX_MP_BUSSES];
48 int mp_bus_id_to_local [MAX_MP_BUSSES];
49 int quad_local_to_mp_bus_id [NR_CPUS/4][4];
50 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
51 static int mp_current_pci_id;
53 /* I/O APIC entries */
54 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
56 /* # of MP IRQ source entries */
57 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
59 /* MP IRQ source entries */
65 unsigned long mp_lapic_addr;
67 unsigned int def_to_bigsmp = 0;
69 /* Processor that is doing the boot up */
70 unsigned int boot_cpu_physical_apicid = -1U;
71 /* Internal processor count */
72 unsigned int __cpuinitdata num_processors;
74 /* Bitmask of physically existing CPUs */
75 physid_mask_t phys_cpu_present_map;
77 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
80 * Intel MP BIOS table parsing routines:
85 * Checksum an MP configuration block.
88 static int __init mpf_checksum(unsigned char *mp, int len)
99 * Have to match translation table entries to main table entries by counter
100 * hence the mpc_record variable .... can't see a less disgusting way of
104 static int mpc_record;
105 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY] __initdata;
107 static void __devinit MP_processor_info (struct mpc_config_processor *m)
110 physid_mask_t phys_cpu;
112 if (!(m->mpc_cpuflag & CPU_ENABLED))
115 apicid = mpc_apic_id(m, translation_table[mpc_record]);
117 if (m->mpc_featureflag&(1<<0))
118 Dprintk(" Floating point unit present.\n");
119 if (m->mpc_featureflag&(1<<7))
120 Dprintk(" Machine Exception supported.\n");
121 if (m->mpc_featureflag&(1<<8))
122 Dprintk(" 64 bit compare & exchange supported.\n");
123 if (m->mpc_featureflag&(1<<9))
124 Dprintk(" Internal APIC present.\n");
125 if (m->mpc_featureflag&(1<<11))
126 Dprintk(" SEP present.\n");
127 if (m->mpc_featureflag&(1<<12))
128 Dprintk(" MTRR present.\n");
129 if (m->mpc_featureflag&(1<<13))
130 Dprintk(" PGE present.\n");
131 if (m->mpc_featureflag&(1<<14))
132 Dprintk(" MCA present.\n");
133 if (m->mpc_featureflag&(1<<15))
134 Dprintk(" CMOV present.\n");
135 if (m->mpc_featureflag&(1<<16))
136 Dprintk(" PAT present.\n");
137 if (m->mpc_featureflag&(1<<17))
138 Dprintk(" PSE present.\n");
139 if (m->mpc_featureflag&(1<<18))
140 Dprintk(" PSN present.\n");
141 if (m->mpc_featureflag&(1<<19))
142 Dprintk(" Cache Line Flush Instruction present.\n");
144 if (m->mpc_featureflag&(1<<21))
145 Dprintk(" Debug Trace and EMON Store present.\n");
146 if (m->mpc_featureflag&(1<<22))
147 Dprintk(" ACPI Thermal Throttle Registers present.\n");
148 if (m->mpc_featureflag&(1<<23))
149 Dprintk(" MMX present.\n");
150 if (m->mpc_featureflag&(1<<24))
151 Dprintk(" FXSR present.\n");
152 if (m->mpc_featureflag&(1<<25))
153 Dprintk(" XMM present.\n");
154 if (m->mpc_featureflag&(1<<26))
155 Dprintk(" Willamette New Instructions present.\n");
156 if (m->mpc_featureflag&(1<<27))
157 Dprintk(" Self Snoop present.\n");
158 if (m->mpc_featureflag&(1<<28))
159 Dprintk(" HT present.\n");
160 if (m->mpc_featureflag&(1<<29))
161 Dprintk(" Thermal Monitor present.\n");
162 /* 30, 31 Reserved */
165 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
166 Dprintk(" Bootup CPU\n");
167 boot_cpu_physical_apicid = m->mpc_apicid;
170 ver = m->mpc_apicver;
176 printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
177 "fixing up to 0x10. (tell your hw vendor)\n",
181 apic_version[m->mpc_apicid] = ver;
183 phys_cpu = apicid_to_cpu_present(apicid);
184 physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
186 if (num_processors >= NR_CPUS) {
187 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
188 " Processor ignored.\n", NR_CPUS);
192 if (num_processors >= maxcpus) {
193 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
194 " Processor ignored.\n", maxcpus);
198 cpu_set(num_processors, cpu_possible_map);
202 * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
203 * but we need to work other dependencies like SMP_SUSPEND etc
204 * before this can be done without some confusion.
205 * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
206 * - Ashok Raj <ashok.raj@intel.com>
208 if (num_processors > 8) {
209 switch (boot_cpu_data.x86_vendor) {
210 case X86_VENDOR_INTEL:
211 if (!APIC_XAPIC(ver)) {
215 /* If P4 and above fall through */
220 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
223 static void __init MP_bus_info (struct mpc_config_bus *m)
227 memcpy(str, m->mpc_bustype, 6);
230 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
232 #if MAX_MP_BUSSES < 256
233 if (m->mpc_busid >= MAX_MP_BUSSES) {
234 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
235 " is too large, max. supported is %d\n",
236 m->mpc_busid, str, MAX_MP_BUSSES - 1);
241 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
242 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
243 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA)-1) == 0) {
244 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
245 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
246 mpc_oem_pci_bus(m, translation_table[mpc_record]);
247 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
248 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
250 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
251 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
253 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
257 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
259 if (!(m->mpc_flags & MPC_APIC_USABLE))
262 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%lX.\n",
263 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
264 if (nr_ioapics >= MAX_IO_APICS) {
265 printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
266 MAX_IO_APICS, nr_ioapics);
267 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
269 if (!m->mpc_apicaddr) {
270 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
271 " found in MP table, skipping!\n");
274 mp_ioapics[nr_ioapics] = *m;
278 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
280 mp_irqs [mp_irq_entries] = *m;
281 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
282 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
283 m->mpc_irqtype, m->mpc_irqflag & 3,
284 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
285 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
286 if (++mp_irq_entries == MAX_IRQ_SOURCES)
287 panic("Max # of irq sources exceeded!!\n");
290 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
292 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
293 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
294 m->mpc_irqtype, m->mpc_irqflag & 3,
295 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
296 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
299 #ifdef CONFIG_X86_NUMAQ
300 static void __init MP_translation_info (struct mpc_config_translation *m)
302 printk(KERN_INFO "Translation: record %d, type %d, quad %d, global %d, local %d\n", mpc_record, m->trans_type, m->trans_quad, m->trans_global, m->trans_local);
304 if (mpc_record >= MAX_MPC_ENTRY)
305 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
307 translation_table[mpc_record] = m; /* stash this for later */
308 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
309 node_set_online(m->trans_quad);
313 * Read/parse the MPC oem tables
316 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
317 unsigned short oemsize)
319 int count = sizeof (*oemtable); /* the header size */
320 unsigned char *oemptr = ((unsigned char *)oemtable)+count;
323 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
324 if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
326 printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
327 oemtable->oem_signature[0],
328 oemtable->oem_signature[1],
329 oemtable->oem_signature[2],
330 oemtable->oem_signature[3]);
333 if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
335 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
338 while (count < oemtable->oem_length) {
342 struct mpc_config_translation *m=
343 (struct mpc_config_translation *)oemptr;
344 MP_translation_info(m);
345 oemptr += sizeof(*m);
352 printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
359 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
362 if (strncmp(oem, "IBM NUMA", 8))
363 printk("Warning! May not be a NUMA-Q system!\n");
365 smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
368 #endif /* CONFIG_X86_NUMAQ */
374 static int __init smp_read_mpc(struct mp_config_table *mpc)
378 int count=sizeof(*mpc);
379 unsigned char *mpt=((unsigned char *)mpc)+count;
381 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
382 printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
383 *(u32 *)mpc->mpc_signature);
386 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
387 printk(KERN_ERR "SMP mptable: checksum error!\n");
390 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
391 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
395 if (!mpc->mpc_lapic) {
396 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
399 memcpy(oem,mpc->mpc_oem,8);
401 printk(KERN_INFO "OEM ID: %s ",oem);
403 memcpy(str,mpc->mpc_productid,12);
405 printk("Product ID: %s ",str);
407 mps_oem_check(mpc, oem, str);
409 printk("APIC at: 0x%lX\n",mpc->mpc_lapic);
412 * Save the local APIC address (it might be non-default) -- but only
413 * if we're not using ACPI.
416 mp_lapic_addr = mpc->mpc_lapic;
419 * Now process the configuration blocks.
422 while (count < mpc->mpc_length) {
426 struct mpc_config_processor *m=
427 (struct mpc_config_processor *)mpt;
428 /* ACPI may have already provided this data */
430 MP_processor_info(m);
437 struct mpc_config_bus *m=
438 (struct mpc_config_bus *)mpt;
446 struct mpc_config_ioapic *m=
447 (struct mpc_config_ioapic *)mpt;
455 struct mpc_config_intsrc *m=
456 (struct mpc_config_intsrc *)mpt;
465 struct mpc_config_lintsrc *m=
466 (struct mpc_config_lintsrc *)mpt;
474 count = mpc->mpc_length;
480 clustered_apic_check();
482 printk(KERN_ERR "SMP mptable: no processors registered!\n");
483 return num_processors;
486 static int __init ELCR_trigger(unsigned int irq)
490 port = 0x4d0 + (irq >> 3);
491 return (inb(port) >> (irq & 7)) & 1;
494 static void __init construct_default_ioirq_mptable(int mpc_default_type)
496 struct mpc_config_intsrc intsrc;
498 int ELCR_fallback = 0;
500 intsrc.mpc_type = MP_INTSRC;
501 intsrc.mpc_irqflag = 0; /* conforming */
502 intsrc.mpc_srcbus = 0;
503 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
505 intsrc.mpc_irqtype = mp_INT;
508 * If true, we have an ISA/PCI system with no IRQ entries
509 * in the MP table. To prevent the PCI interrupts from being set up
510 * incorrectly, we try to use the ELCR. The sanity check to see if
511 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
512 * never be level sensitive, so we simply see if the ELCR agrees.
513 * If it does, we assume it's valid.
515 if (mpc_default_type == 5) {
516 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
518 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
519 printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
521 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
526 for (i = 0; i < 16; i++) {
527 switch (mpc_default_type) {
529 if (i == 0 || i == 13)
530 continue; /* IRQ0 & IRQ13 not connected */
534 continue; /* IRQ2 is never connected */
539 * If the ELCR indicates a level-sensitive interrupt, we
540 * copy that information over to the MP table in the
541 * irqflag field (level sensitive, active high polarity).
544 intsrc.mpc_irqflag = 13;
546 intsrc.mpc_irqflag = 0;
549 intsrc.mpc_srcbusirq = i;
550 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
551 MP_intsrc_info(&intsrc);
554 intsrc.mpc_irqtype = mp_ExtINT;
555 intsrc.mpc_srcbusirq = 0;
556 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
557 MP_intsrc_info(&intsrc);
560 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
562 struct mpc_config_processor processor;
563 struct mpc_config_bus bus;
564 struct mpc_config_ioapic ioapic;
565 struct mpc_config_lintsrc lintsrc;
566 int linttypes[2] = { mp_ExtINT, mp_NMI };
570 * local APIC has default address
572 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
575 * 2 CPUs, numbered 0 & 1.
577 processor.mpc_type = MP_PROCESSOR;
578 /* Either an integrated APIC or a discrete 82489DX. */
579 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
580 processor.mpc_cpuflag = CPU_ENABLED;
581 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
582 (boot_cpu_data.x86_model << 4) |
583 boot_cpu_data.x86_mask;
584 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
585 processor.mpc_reserved[0] = 0;
586 processor.mpc_reserved[1] = 0;
587 for (i = 0; i < 2; i++) {
588 processor.mpc_apicid = i;
589 MP_processor_info(&processor);
592 bus.mpc_type = MP_BUS;
594 switch (mpc_default_type) {
597 printk(KERN_ERR "Unknown standard configuration %d\n",
602 memcpy(bus.mpc_bustype, "ISA ", 6);
607 memcpy(bus.mpc_bustype, "EISA ", 6);
611 memcpy(bus.mpc_bustype, "MCA ", 6);
614 if (mpc_default_type > 4) {
616 memcpy(bus.mpc_bustype, "PCI ", 6);
620 ioapic.mpc_type = MP_IOAPIC;
621 ioapic.mpc_apicid = 2;
622 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
623 ioapic.mpc_flags = MPC_APIC_USABLE;
624 ioapic.mpc_apicaddr = 0xFEC00000;
625 MP_ioapic_info(&ioapic);
628 * We set up most of the low 16 IO-APIC pins according to MPS rules.
630 construct_default_ioirq_mptable(mpc_default_type);
632 lintsrc.mpc_type = MP_LINTSRC;
633 lintsrc.mpc_irqflag = 0; /* conforming */
634 lintsrc.mpc_srcbusid = 0;
635 lintsrc.mpc_srcbusirq = 0;
636 lintsrc.mpc_destapic = MP_APIC_ALL;
637 for (i = 0; i < 2; i++) {
638 lintsrc.mpc_irqtype = linttypes[i];
639 lintsrc.mpc_destapiclint = i;
640 MP_lintsrc_info(&lintsrc);
644 static struct intel_mp_floating *mpf_found;
647 * Scan the memory blocks for an SMP configuration block.
649 void __init get_smp_config (void)
651 struct intel_mp_floating *mpf = mpf_found;
654 * ACPI supports both logical (e.g. Hyper-Threading) and physical
655 * processors, where MPS only supports physical.
657 if (acpi_lapic && acpi_ioapic) {
658 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
662 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
664 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
665 if (mpf->mpf_feature2 & (1<<7)) {
666 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
669 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
674 * Now see if we need to read further.
676 if (mpf->mpf_feature1 != 0) {
678 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
679 construct_default_ISA_mptable(mpf->mpf_feature1);
681 } else if (mpf->mpf_physptr) {
684 * Read the physical hardware table. Anything here will
685 * override the defaults.
687 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
688 smp_found_config = 0;
689 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
690 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
694 * If there are no explicit MP IRQ entries, then we are
695 * broken. We set up most of the low 16 IO-APIC pins to
696 * ISA defaults and hope it will work.
698 if (!mp_irq_entries) {
699 struct mpc_config_bus bus;
701 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
703 bus.mpc_type = MP_BUS;
705 memcpy(bus.mpc_bustype, "ISA ", 6);
708 construct_default_ioirq_mptable(0);
714 printk(KERN_INFO "Processors: %d\n", num_processors);
716 * Only use the first configuration found.
720 static int __init smp_scan_config (unsigned long base, unsigned long length)
722 unsigned long *bp = phys_to_virt(base);
723 struct intel_mp_floating *mpf;
725 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
726 if (sizeof(*mpf) != 16)
727 printk("Error: MPF size\n");
730 mpf = (struct intel_mp_floating *)bp;
731 if ((*bp == SMP_MAGIC_IDENT) &&
732 (mpf->mpf_length == 1) &&
733 !mpf_checksum((unsigned char *)bp, 16) &&
734 ((mpf->mpf_specification == 1)
735 || (mpf->mpf_specification == 4)) ) {
737 smp_found_config = 1;
738 printk(KERN_INFO "found SMP MP-table at %08lx\n",
740 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
741 if (mpf->mpf_physptr) {
743 * We cannot access to MPC table to compute
744 * table size yet, as only few megabytes from
745 * the bottom is mapped now.
746 * PC-9800's MPC table places on the very last
747 * of physical memory; so that simply reserving
748 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
749 * in reserve_bootmem.
751 unsigned long size = PAGE_SIZE;
752 unsigned long end = max_low_pfn * PAGE_SIZE;
753 if (mpf->mpf_physptr + size > end)
754 size = end - mpf->mpf_physptr;
755 reserve_bootmem(mpf->mpf_physptr, size);
767 void __init find_smp_config (void)
769 unsigned int address;
772 * FIXME: Linux assumes you have 640K of base ram..
773 * this continues the error...
775 * 1) Scan the bottom 1K for a signature
776 * 2) Scan the top 1K of base RAM
777 * 3) Scan the 64K of bios
779 if (smp_scan_config(0x0,0x400) ||
780 smp_scan_config(639*0x400,0x400) ||
781 smp_scan_config(0xF0000,0x10000))
784 * If it is an SMP machine we should know now, unless the
785 * configuration is in an EISA/MCA bus machine with an
786 * extended bios data area.
788 * there is a real-mode segmented pointer pointing to the
789 * 4K EBDA area at 0x40E, calculate and scan it here.
791 * NOTE! There are Linux loaders that will corrupt the EBDA
792 * area, and as such this kind of SMP config may be less
793 * trustworthy, simply because the SMP table may have been
794 * stomped on during early boot. These loaders are buggy and
797 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
800 address = get_bios_ebda();
802 smp_scan_config(address, 0x400);
807 /* --------------------------------------------------------------------------
808 ACPI-based MP Configuration
809 -------------------------------------------------------------------------- */
813 void __init mp_register_lapic_address(u64 address)
815 mp_lapic_addr = (unsigned long) address;
817 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
819 if (boot_cpu_physical_apicid == -1U)
820 boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
822 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
825 void __devinit mp_register_lapic (u8 id, u8 enabled)
827 struct mpc_config_processor processor;
830 if (MAX_APICS - id <= 0) {
831 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
836 if (id == boot_cpu_physical_apicid)
839 processor.mpc_type = MP_PROCESSOR;
840 processor.mpc_apicid = id;
841 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
842 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
843 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
844 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
845 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
846 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
847 processor.mpc_reserved[0] = 0;
848 processor.mpc_reserved[1] = 0;
850 MP_processor_info(&processor);
853 #ifdef CONFIG_X86_IO_APIC
856 #define MP_MAX_IOAPIC_PIN 127
858 static struct mp_ioapic_routing {
862 u32 pin_programmed[4];
863 } mp_ioapic_routing[MAX_IO_APICS];
865 static int mp_find_ioapic (int gsi)
869 /* Find the IOAPIC that manages this GSI. */
870 for (i = 0; i < nr_ioapics; i++) {
871 if ((gsi >= mp_ioapic_routing[i].gsi_base)
872 && (gsi <= mp_ioapic_routing[i].gsi_end))
876 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
881 void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
886 if (nr_ioapics >= MAX_IO_APICS) {
887 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
888 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
889 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
892 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
893 " found in MADT table, skipping!\n");
899 mp_ioapics[idx].mpc_type = MP_IOAPIC;
900 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
901 mp_ioapics[idx].mpc_apicaddr = address;
903 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
904 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
905 && !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
906 tmpid = io_apic_get_unique_id(idx, id);
913 mp_ioapics[idx].mpc_apicid = tmpid;
914 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
917 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
918 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
920 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
921 mp_ioapic_routing[idx].gsi_base = gsi_base;
922 mp_ioapic_routing[idx].gsi_end = gsi_base +
923 io_apic_get_redir_entries(idx);
925 printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
926 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
927 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
928 mp_ioapic_routing[idx].gsi_base,
929 mp_ioapic_routing[idx].gsi_end);
933 mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
935 struct mpc_config_intsrc intsrc;
940 * Convert 'gsi' to 'ioapic.pin'.
942 ioapic = mp_find_ioapic(gsi);
945 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
948 * TBD: This check is for faulty timer entries, where the override
949 * erroneously sets the trigger to level, resulting in a HUGE
950 * increase of timer interrupts!
952 if ((bus_irq == 0) && (trigger == 3))
955 intsrc.mpc_type = MP_INTSRC;
956 intsrc.mpc_irqtype = mp_INT;
957 intsrc.mpc_irqflag = (trigger << 2) | polarity;
958 intsrc.mpc_srcbus = MP_ISA_BUS;
959 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
960 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
961 intsrc.mpc_dstirq = pin; /* INTIN# */
963 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
964 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
965 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
966 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
968 mp_irqs[mp_irq_entries] = intsrc;
969 if (++mp_irq_entries == MAX_IRQ_SOURCES)
970 panic("Max # of irq sources exceeded!\n");
973 void __init mp_config_acpi_legacy_irqs (void)
975 struct mpc_config_intsrc intsrc;
980 * Fabricate the legacy ISA bus (bus #31).
982 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
983 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
986 * Older generations of ES7000 have no legacy identity mappings
988 if (es7000_plat == 1)
992 * Locate the IOAPIC that manages the ISA IRQs (0-15).
994 ioapic = mp_find_ioapic(0);
998 intsrc.mpc_type = MP_INTSRC;
999 intsrc.mpc_irqflag = 0; /* Conforming */
1000 intsrc.mpc_srcbus = MP_ISA_BUS;
1001 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1004 * Use the default configuration for the IRQs 0-15. Unless
1005 * overriden by (MADT) interrupt source override entries.
1007 for (i = 0; i < 16; i++) {
1010 for (idx = 0; idx < mp_irq_entries; idx++) {
1011 struct mpc_config_intsrc *irq = mp_irqs + idx;
1013 /* Do we already have a mapping for this ISA IRQ? */
1014 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
1017 /* Do we already have a mapping for this IOAPIC pin */
1018 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
1019 (irq->mpc_dstirq == i))
1023 if (idx != mp_irq_entries) {
1024 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1025 continue; /* IRQ already used */
1028 intsrc.mpc_irqtype = mp_INT;
1029 intsrc.mpc_srcbusirq = i; /* Identity mapped */
1030 intsrc.mpc_dstirq = i;
1032 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
1033 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1034 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1035 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
1038 mp_irqs[mp_irq_entries] = intsrc;
1039 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1040 panic("Max # of irq sources exceeded!\n");
1044 #define MAX_GSI_NUM 4096
1046 int mp_register_gsi(u32 gsi, int triggering, int polarity)
1051 static int pci_irq = 16;
1053 * Mapping between Global System Interrups, which
1054 * represent all possible interrupts, and IRQs
1055 * assigned to actual devices.
1057 static int gsi_to_irq[MAX_GSI_NUM];
1059 /* Don't set up the ACPI SCI because it's already set up */
1060 if (acpi_fadt.sci_int == gsi)
1063 ioapic = mp_find_ioapic(gsi);
1065 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1069 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1071 if (ioapic_renumber_irq)
1072 gsi = ioapic_renumber_irq(ioapic, gsi);
1075 * Avoid pin reprogramming. PRTs typically include entries
1076 * with redundant pin->gsi mappings (but unique PCI devices);
1077 * we only program the IOAPIC on the first.
1079 bit = ioapic_pin % 32;
1080 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
1082 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1083 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1087 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
1088 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1089 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1090 return gsi_to_irq[gsi];
1093 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
1095 if (triggering == ACPI_LEVEL_SENSITIVE) {
1097 * For PCI devices assign IRQs in order, avoiding gaps
1098 * due to unused I/O APIC pins.
1101 if (gsi < MAX_GSI_NUM) {
1103 * Retain the VIA chipset work-around (gsi > 15), but
1104 * avoid a problem where the 8254 timer (IRQ0) is setup
1105 * via an override (so it's not on pin 0 of the ioapic),
1106 * and at the same time, the pin 0 interrupt is a PCI
1107 * type. The gsi > 15 test could cause these two pins
1108 * to be shared as IRQ0, and they are not shareable.
1109 * So test for this condition, and if necessary, avoid
1110 * the pin collision.
1112 if (gsi > 15 || (gsi == 0 && !timer_uses_ioapic_pin_0))
1115 * Don't assign IRQ used by ACPI SCI
1117 if (gsi == acpi_fadt.sci_int)
1119 gsi_to_irq[irq] = gsi;
1121 printk(KERN_ERR "GSI %u is too high\n", gsi);
1126 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1127 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1128 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1132 #endif /* CONFIG_X86_IO_APIC */
1133 #endif /* CONFIG_ACPI */