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/delay.h>
19 #include <linux/bootmem.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/mc146818rtc.h>
22 #include <linux/acpi.h>
23 #include <linux/module.h>
27 #include <asm/mpspec.h>
28 #include <asm/pgalloc.h>
29 #include <asm/io_apic.h>
30 #include <asm/proto.h>
33 /* Have we found an MP table */
35 unsigned int __cpuinitdata maxcpus
= NR_CPUS
;
38 * Various Linux-internal data structures created from the
41 DECLARE_BITMAP(mp_bus_not_pci
, MAX_MP_BUSSES
);
42 int mp_bus_id_to_pci_bus
[MAX_MP_BUSSES
] = { [0 ... MAX_MP_BUSSES
-1] = -1 };
44 static int mp_current_pci_id
= 0;
45 /* I/O APIC entries */
46 struct mpc_config_ioapic mp_ioapics
[MAX_IO_APICS
];
48 /* # of MP IRQ source entries */
49 struct mpc_config_intsrc mp_irqs
[MAX_IRQ_SOURCES
];
51 /* MP IRQ source entries */
55 unsigned long mp_lapic_addr
= 0;
59 /* Processor that is doing the boot up */
60 unsigned int boot_cpu_id
= -1U;
61 EXPORT_SYMBOL(boot_cpu_id
);
63 /* Internal processor count */
64 unsigned int num_processors
;
66 unsigned disabled_cpus __cpuinitdata
;
68 /* Bitmask of physically existing CPUs */
69 physid_mask_t phys_cpu_present_map
= PHYSID_MASK_NONE
;
71 u16 x86_bios_cpu_apicid_init
[NR_CPUS
] __initdata
72 = { [0 ... NR_CPUS
-1] = BAD_APICID
};
73 void *x86_bios_cpu_apicid_early_ptr
;
74 DEFINE_PER_CPU(u16
, x86_bios_cpu_apicid
) = BAD_APICID
;
75 EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid
);
79 * Intel MP BIOS table parsing routines:
83 * Checksum an MP configuration block.
86 static int __init
mpf_checksum(unsigned char *mp
, int len
)
96 static void __cpuinit
MP_processor_info(struct mpc_config_processor
*m
)
100 char *bootup_cpu
= "";
102 if (!(m
->mpc_cpuflag
& CPU_ENABLED
)) {
106 if (m
->mpc_cpuflag
& CPU_BOOTPROCESSOR
) {
107 bootup_cpu
= " (Bootup-CPU)";
108 boot_cpu_id
= m
->mpc_apicid
;
111 printk(KERN_INFO
"Processor #%d%s\n", m
->mpc_apicid
, bootup_cpu
);
113 if (num_processors
>= NR_CPUS
) {
114 printk(KERN_WARNING
"WARNING: NR_CPUS limit of %i reached."
115 " Processor ignored.\n", NR_CPUS
);
119 if (num_processors
>= maxcpus
) {
120 printk(KERN_WARNING
"WARNING: maxcpus limit of %i reached."
121 " Processor ignored.\n", maxcpus
);
126 cpus_complement(tmp_map
, cpu_present_map
);
127 cpu
= first_cpu(tmp_map
);
129 physid_set(m
->mpc_apicid
, phys_cpu_present_map
);
130 if (m
->mpc_cpuflag
& CPU_BOOTPROCESSOR
) {
132 * x86_bios_cpu_apicid is required to have processors listed
133 * in same order as logical cpu numbers. Hence the first
134 * entry is BSP, and so on.
138 /* are we being called early in kernel startup? */
139 if (x86_cpu_to_apicid_early_ptr
) {
140 u16
*cpu_to_apicid
= x86_cpu_to_apicid_early_ptr
;
141 u16
*bios_cpu_apicid
= x86_bios_cpu_apicid_early_ptr
;
143 cpu_to_apicid
[cpu
] = m
->mpc_apicid
;
144 bios_cpu_apicid
[cpu
] = m
->mpc_apicid
;
146 per_cpu(x86_cpu_to_apicid
, cpu
) = m
->mpc_apicid
;
147 per_cpu(x86_bios_cpu_apicid
, cpu
) = m
->mpc_apicid
;
150 cpu_set(cpu
, cpu_possible_map
);
151 cpu_set(cpu
, cpu_present_map
);
154 static void __init
MP_bus_info (struct mpc_config_bus
*m
)
158 memcpy(str
, m
->mpc_bustype
, 6);
160 Dprintk("Bus #%d is %s\n", m
->mpc_busid
, str
);
162 if (strncmp(str
, "ISA", 3) == 0) {
163 set_bit(m
->mpc_busid
, mp_bus_not_pci
);
164 } else if (strncmp(str
, "PCI", 3) == 0) {
165 clear_bit(m
->mpc_busid
, mp_bus_not_pci
);
166 mp_bus_id_to_pci_bus
[m
->mpc_busid
] = mp_current_pci_id
;
169 printk(KERN_ERR
"Unknown bustype %s\n", str
);
173 static int bad_ioapic(unsigned long address
)
175 if (nr_ioapics
>= MAX_IO_APICS
) {
176 printk(KERN_ERR
"ERROR: Max # of I/O APICs (%d) exceeded "
177 "(found %d)\n", MAX_IO_APICS
, nr_ioapics
);
178 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
181 printk(KERN_ERR
"WARNING: Bogus (zero) I/O APIC address"
182 " found in table, skipping!\n");
188 static void __init
MP_ioapic_info (struct mpc_config_ioapic
*m
)
190 if (!(m
->mpc_flags
& MPC_APIC_USABLE
))
193 printk("I/O APIC #%d at 0x%X.\n",
194 m
->mpc_apicid
, m
->mpc_apicaddr
);
196 if (bad_ioapic(m
->mpc_apicaddr
))
199 mp_ioapics
[nr_ioapics
] = *m
;
203 static void __init
MP_intsrc_info (struct mpc_config_intsrc
*m
)
205 mp_irqs
[mp_irq_entries
] = *m
;
206 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
207 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
208 m
->mpc_irqtype
, m
->mpc_irqflag
& 3,
209 (m
->mpc_irqflag
>> 2) & 3, m
->mpc_srcbus
,
210 m
->mpc_srcbusirq
, m
->mpc_dstapic
, m
->mpc_dstirq
);
211 if (++mp_irq_entries
>= MAX_IRQ_SOURCES
)
212 panic("Max # of irq sources exceeded!!\n");
215 static void __init
MP_lintsrc_info (struct mpc_config_lintsrc
*m
)
217 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
218 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
219 m
->mpc_irqtype
, m
->mpc_irqflag
& 3,
220 (m
->mpc_irqflag
>> 2) &3, m
->mpc_srcbusid
,
221 m
->mpc_srcbusirq
, m
->mpc_destapic
, m
->mpc_destapiclint
);
228 static int __init
smp_read_mpc(struct mp_config_table
*mpc
)
231 int count
=sizeof(*mpc
);
232 unsigned char *mpt
=((unsigned char *)mpc
)+count
;
234 if (memcmp(mpc
->mpc_signature
,MPC_SIGNATURE
,4)) {
235 printk("MPTABLE: bad signature [%c%c%c%c]!\n",
236 mpc
->mpc_signature
[0],
237 mpc
->mpc_signature
[1],
238 mpc
->mpc_signature
[2],
239 mpc
->mpc_signature
[3]);
242 if (mpf_checksum((unsigned char *)mpc
,mpc
->mpc_length
)) {
243 printk("MPTABLE: checksum error!\n");
246 if (mpc
->mpc_spec
!=0x01 && mpc
->mpc_spec
!=0x04) {
247 printk(KERN_ERR
"MPTABLE: bad table version (%d)!!\n",
251 if (!mpc
->mpc_lapic
) {
252 printk(KERN_ERR
"MPTABLE: null local APIC address!\n");
255 memcpy(str
,mpc
->mpc_oem
,8);
257 printk(KERN_INFO
"MPTABLE: OEM ID: %s ",str
);
259 memcpy(str
,mpc
->mpc_productid
,12);
261 printk("MPTABLE: Product ID: %s ",str
);
263 printk("MPTABLE: APIC at: 0x%X\n",mpc
->mpc_lapic
);
265 /* save the local APIC address, it might be non-default */
267 mp_lapic_addr
= mpc
->mpc_lapic
;
270 * Now process the configuration blocks.
272 while (count
< mpc
->mpc_length
) {
276 struct mpc_config_processor
*m
=
277 (struct mpc_config_processor
*)mpt
;
279 MP_processor_info(m
);
286 struct mpc_config_bus
*m
=
287 (struct mpc_config_bus
*)mpt
;
295 struct mpc_config_ioapic
*m
=
296 (struct mpc_config_ioapic
*)mpt
;
304 struct mpc_config_intsrc
*m
=
305 (struct mpc_config_intsrc
*)mpt
;
314 struct mpc_config_lintsrc
*m
=
315 (struct mpc_config_lintsrc
*)mpt
;
323 setup_apic_routing();
325 printk(KERN_ERR
"MPTABLE: no processors registered!\n");
326 return num_processors
;
329 static int __init
ELCR_trigger(unsigned int irq
)
333 port
= 0x4d0 + (irq
>> 3);
334 return (inb(port
) >> (irq
& 7)) & 1;
337 static void __init
construct_default_ioirq_mptable(int mpc_default_type
)
339 struct mpc_config_intsrc intsrc
;
341 int ELCR_fallback
= 0;
343 intsrc
.mpc_type
= MP_INTSRC
;
344 intsrc
.mpc_irqflag
= 0; /* conforming */
345 intsrc
.mpc_srcbus
= 0;
346 intsrc
.mpc_dstapic
= mp_ioapics
[0].mpc_apicid
;
348 intsrc
.mpc_irqtype
= mp_INT
;
351 * If true, we have an ISA/PCI system with no IRQ entries
352 * in the MP table. To prevent the PCI interrupts from being set up
353 * incorrectly, we try to use the ELCR. The sanity check to see if
354 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
355 * never be level sensitive, so we simply see if the ELCR agrees.
356 * If it does, we assume it's valid.
358 if (mpc_default_type
== 5) {
359 printk(KERN_INFO
"ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
361 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
362 printk(KERN_ERR
"ELCR contains invalid data... not using ELCR\n");
364 printk(KERN_INFO
"Using ELCR to identify PCI interrupts\n");
369 for (i
= 0; i
< 16; i
++) {
370 switch (mpc_default_type
) {
372 if (i
== 0 || i
== 13)
373 continue; /* IRQ0 & IRQ13 not connected */
377 continue; /* IRQ2 is never connected */
382 * If the ELCR indicates a level-sensitive interrupt, we
383 * copy that information over to the MP table in the
384 * irqflag field (level sensitive, active high polarity).
387 intsrc
.mpc_irqflag
= 13;
389 intsrc
.mpc_irqflag
= 0;
392 intsrc
.mpc_srcbusirq
= i
;
393 intsrc
.mpc_dstirq
= i
? i
: 2; /* IRQ0 to INTIN2 */
394 MP_intsrc_info(&intsrc
);
397 intsrc
.mpc_irqtype
= mp_ExtINT
;
398 intsrc
.mpc_srcbusirq
= 0;
399 intsrc
.mpc_dstirq
= 0; /* 8259A to INTIN0 */
400 MP_intsrc_info(&intsrc
);
403 static inline void __init
construct_default_ISA_mptable(int mpc_default_type
)
405 struct mpc_config_processor processor
;
406 struct mpc_config_bus bus
;
407 struct mpc_config_ioapic ioapic
;
408 struct mpc_config_lintsrc lintsrc
;
409 int linttypes
[2] = { mp_ExtINT
, mp_NMI
};
413 * local APIC has default address
415 mp_lapic_addr
= APIC_DEFAULT_PHYS_BASE
;
418 * 2 CPUs, numbered 0 & 1.
420 processor
.mpc_type
= MP_PROCESSOR
;
421 processor
.mpc_apicver
= 0;
422 processor
.mpc_cpuflag
= CPU_ENABLED
;
423 processor
.mpc_cpufeature
= 0;
424 processor
.mpc_featureflag
= 0;
425 processor
.mpc_reserved
[0] = 0;
426 processor
.mpc_reserved
[1] = 0;
427 for (i
= 0; i
< 2; i
++) {
428 processor
.mpc_apicid
= i
;
429 MP_processor_info(&processor
);
432 bus
.mpc_type
= MP_BUS
;
434 switch (mpc_default_type
) {
436 printk(KERN_ERR
"???\nUnknown standard configuration %d\n",
441 memcpy(bus
.mpc_bustype
, "ISA ", 6);
445 if (mpc_default_type
> 4) {
447 memcpy(bus
.mpc_bustype
, "PCI ", 6);
451 ioapic
.mpc_type
= MP_IOAPIC
;
452 ioapic
.mpc_apicid
= 2;
453 ioapic
.mpc_apicver
= 0;
454 ioapic
.mpc_flags
= MPC_APIC_USABLE
;
455 ioapic
.mpc_apicaddr
= 0xFEC00000;
456 MP_ioapic_info(&ioapic
);
459 * We set up most of the low 16 IO-APIC pins according to MPS rules.
461 construct_default_ioirq_mptable(mpc_default_type
);
463 lintsrc
.mpc_type
= MP_LINTSRC
;
464 lintsrc
.mpc_irqflag
= 0; /* conforming */
465 lintsrc
.mpc_srcbusid
= 0;
466 lintsrc
.mpc_srcbusirq
= 0;
467 lintsrc
.mpc_destapic
= MP_APIC_ALL
;
468 for (i
= 0; i
< 2; i
++) {
469 lintsrc
.mpc_irqtype
= linttypes
[i
];
470 lintsrc
.mpc_destapiclint
= i
;
471 MP_lintsrc_info(&lintsrc
);
475 static struct intel_mp_floating
*mpf_found
;
478 * Scan the memory blocks for an SMP configuration block.
480 void __init
get_smp_config (void)
482 struct intel_mp_floating
*mpf
= mpf_found
;
485 * ACPI supports both logical (e.g. Hyper-Threading) and physical
486 * processors, where MPS only supports physical.
488 if (acpi_lapic
&& acpi_ioapic
) {
489 printk(KERN_INFO
"Using ACPI (MADT) for SMP configuration information\n");
493 printk(KERN_INFO
"Using ACPI for processor (LAPIC) configuration information\n");
495 printk("Intel MultiProcessor Specification v1.%d\n", mpf
->mpf_specification
);
498 * Now see if we need to read further.
500 if (mpf
->mpf_feature1
!= 0) {
502 printk(KERN_INFO
"Default MP configuration #%d\n", mpf
->mpf_feature1
);
503 construct_default_ISA_mptable(mpf
->mpf_feature1
);
505 } else if (mpf
->mpf_physptr
) {
508 * Read the physical hardware table. Anything here will
509 * override the defaults.
511 if (!smp_read_mpc(phys_to_virt(mpf
->mpf_physptr
))) {
512 smp_found_config
= 0;
513 printk(KERN_ERR
"BIOS bug, MP table errors detected!...\n");
514 printk(KERN_ERR
"... disabling SMP support. (tell your hw vendor)\n");
518 * If there are no explicit MP IRQ entries, then we are
519 * broken. We set up most of the low 16 IO-APIC pins to
520 * ISA defaults and hope it will work.
522 if (!mp_irq_entries
) {
523 struct mpc_config_bus bus
;
525 printk(KERN_ERR
"BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
527 bus
.mpc_type
= MP_BUS
;
529 memcpy(bus
.mpc_bustype
, "ISA ", 6);
532 construct_default_ioirq_mptable(0);
538 printk(KERN_INFO
"Processors: %d\n", num_processors
);
540 * Only use the first configuration found.
544 static int __init
smp_scan_config (unsigned long base
, unsigned long length
)
546 extern void __bad_mpf_size(void);
547 unsigned int *bp
= phys_to_virt(base
);
548 struct intel_mp_floating
*mpf
;
550 Dprintk("Scan SMP from %p for %ld bytes.\n", bp
,length
);
551 if (sizeof(*mpf
) != 16)
555 mpf
= (struct intel_mp_floating
*)bp
;
556 if ((*bp
== SMP_MAGIC_IDENT
) &&
557 (mpf
->mpf_length
== 1) &&
558 !mpf_checksum((unsigned char *)bp
, 16) &&
559 ((mpf
->mpf_specification
== 1)
560 || (mpf
->mpf_specification
== 4)) ) {
562 smp_found_config
= 1;
563 reserve_bootmem_generic(virt_to_phys(mpf
), PAGE_SIZE
);
564 if (mpf
->mpf_physptr
)
565 reserve_bootmem_generic(mpf
->mpf_physptr
, PAGE_SIZE
);
575 void __init
find_smp_config(void)
577 unsigned int address
;
580 * FIXME: Linux assumes you have 640K of base ram..
581 * this continues the error...
583 * 1) Scan the bottom 1K for a signature
584 * 2) Scan the top 1K of base RAM
585 * 3) Scan the 64K of bios
587 if (smp_scan_config(0x0,0x400) ||
588 smp_scan_config(639*0x400,0x400) ||
589 smp_scan_config(0xF0000,0x10000))
592 * If it is an SMP machine we should know now.
594 * there is a real-mode segmented pointer pointing to the
595 * 4K EBDA area at 0x40E, calculate and scan it here.
597 * NOTE! There are Linux loaders that will corrupt the EBDA
598 * area, and as such this kind of SMP config may be less
599 * trustworthy, simply because the SMP table may have been
600 * stomped on during early boot. These loaders are buggy and
604 address
= *(unsigned short *)phys_to_virt(0x40E);
606 if (smp_scan_config(address
, 0x1000))
609 /* If we have come this far, we did not find an MP table */
610 printk(KERN_INFO
"No mptable found.\n");
613 /* --------------------------------------------------------------------------
614 ACPI-based MP Configuration
615 -------------------------------------------------------------------------- */
619 void __init
mp_register_lapic_address(u64 address
)
621 mp_lapic_addr
= (unsigned long) address
;
622 set_fixmap_nocache(FIX_APIC_BASE
, mp_lapic_addr
);
623 if (boot_cpu_id
== -1U)
624 boot_cpu_id
= GET_APIC_ID(apic_read(APIC_ID
));
627 void __cpuinit
mp_register_lapic (u8 id
, u8 enabled
)
629 struct mpc_config_processor processor
;
632 if (id
== boot_cpu_id
)
635 processor
.mpc_type
= MP_PROCESSOR
;
636 processor
.mpc_apicid
= id
;
637 processor
.mpc_apicver
= 0;
638 processor
.mpc_cpuflag
= (enabled
? CPU_ENABLED
: 0);
639 processor
.mpc_cpuflag
|= (boot_cpu
? CPU_BOOTPROCESSOR
: 0);
640 processor
.mpc_cpufeature
= 0;
641 processor
.mpc_featureflag
= 0;
642 processor
.mpc_reserved
[0] = 0;
643 processor
.mpc_reserved
[1] = 0;
645 MP_processor_info(&processor
);
649 #define MP_MAX_IOAPIC_PIN 127
651 static struct mp_ioapic_routing
{
655 u32 pin_programmed
[4];
656 } mp_ioapic_routing
[MAX_IO_APICS
];
658 static int mp_find_ioapic(int gsi
)
662 /* Find the IOAPIC that manages this GSI. */
663 for (i
= 0; i
< nr_ioapics
; i
++) {
664 if ((gsi
>= mp_ioapic_routing
[i
].gsi_start
)
665 && (gsi
<= mp_ioapic_routing
[i
].gsi_end
))
669 printk(KERN_ERR
"ERROR: Unable to locate IOAPIC for GSI %d\n", gsi
);
673 static u8
uniq_ioapic_id(u8 id
)
676 DECLARE_BITMAP(used
, 256);
677 bitmap_zero(used
, 256);
678 for (i
= 0; i
< nr_ioapics
; i
++) {
679 struct mpc_config_ioapic
*ia
= &mp_ioapics
[i
];
680 __set_bit(ia
->mpc_apicid
, used
);
682 if (!test_bit(id
, used
))
684 return find_first_zero_bit(used
, 256);
687 void __init
mp_register_ioapic(u8 id
, u32 address
, u32 gsi_base
)
691 if (bad_ioapic(address
))
696 mp_ioapics
[idx
].mpc_type
= MP_IOAPIC
;
697 mp_ioapics
[idx
].mpc_flags
= MPC_APIC_USABLE
;
698 mp_ioapics
[idx
].mpc_apicaddr
= address
;
700 set_fixmap_nocache(FIX_IO_APIC_BASE_0
+ idx
, address
);
701 mp_ioapics
[idx
].mpc_apicid
= uniq_ioapic_id(id
);
702 mp_ioapics
[idx
].mpc_apicver
= 0;
705 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
706 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
708 mp_ioapic_routing
[idx
].apic_id
= mp_ioapics
[idx
].mpc_apicid
;
709 mp_ioapic_routing
[idx
].gsi_start
= gsi_base
;
710 mp_ioapic_routing
[idx
].gsi_end
= gsi_base
+
711 io_apic_get_redir_entries(idx
);
713 printk(KERN_INFO
"IOAPIC[%d]: apic_id %d, address 0x%x, "
714 "GSI %d-%d\n", idx
, mp_ioapics
[idx
].mpc_apicid
,
715 mp_ioapics
[idx
].mpc_apicaddr
,
716 mp_ioapic_routing
[idx
].gsi_start
,
717 mp_ioapic_routing
[idx
].gsi_end
);
723 mp_override_legacy_irq(u8 bus_irq
, u8 polarity
, u8 trigger
, u32 gsi
)
725 struct mpc_config_intsrc intsrc
;
730 * Convert 'gsi' to 'ioapic.pin'.
732 ioapic
= mp_find_ioapic(gsi
);
735 pin
= gsi
- mp_ioapic_routing
[ioapic
].gsi_start
;
738 * TBD: This check is for faulty timer entries, where the override
739 * erroneously sets the trigger to level, resulting in a HUGE
740 * increase of timer interrupts!
742 if ((bus_irq
== 0) && (trigger
== 3))
745 intsrc
.mpc_type
= MP_INTSRC
;
746 intsrc
.mpc_irqtype
= mp_INT
;
747 intsrc
.mpc_irqflag
= (trigger
<< 2) | polarity
;
748 intsrc
.mpc_srcbus
= MP_ISA_BUS
;
749 intsrc
.mpc_srcbusirq
= bus_irq
; /* IRQ */
750 intsrc
.mpc_dstapic
= mp_ioapics
[ioapic
].mpc_apicid
; /* APIC ID */
751 intsrc
.mpc_dstirq
= pin
; /* INTIN# */
753 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
754 intsrc
.mpc_irqtype
, intsrc
.mpc_irqflag
& 3,
755 (intsrc
.mpc_irqflag
>> 2) & 3, intsrc
.mpc_srcbus
,
756 intsrc
.mpc_srcbusirq
, intsrc
.mpc_dstapic
, intsrc
.mpc_dstirq
);
758 mp_irqs
[mp_irq_entries
] = intsrc
;
759 if (++mp_irq_entries
== MAX_IRQ_SOURCES
)
760 panic("Max # of irq sources exceeded!\n");
763 void __init
mp_config_acpi_legacy_irqs(void)
765 struct mpc_config_intsrc intsrc
;
770 * Fabricate the legacy ISA bus (bus #31).
772 set_bit(MP_ISA_BUS
, mp_bus_not_pci
);
775 * Locate the IOAPIC that manages the ISA IRQs (0-15).
777 ioapic
= mp_find_ioapic(0);
781 intsrc
.mpc_type
= MP_INTSRC
;
782 intsrc
.mpc_irqflag
= 0; /* Conforming */
783 intsrc
.mpc_srcbus
= MP_ISA_BUS
;
784 intsrc
.mpc_dstapic
= mp_ioapics
[ioapic
].mpc_apicid
;
787 * Use the default configuration for the IRQs 0-15. Unless
788 * overridden by (MADT) interrupt source override entries.
790 for (i
= 0; i
< 16; i
++) {
793 for (idx
= 0; idx
< mp_irq_entries
; idx
++) {
794 struct mpc_config_intsrc
*irq
= mp_irqs
+ idx
;
796 /* Do we already have a mapping for this ISA IRQ? */
797 if (irq
->mpc_srcbus
== MP_ISA_BUS
&& irq
->mpc_srcbusirq
== i
)
800 /* Do we already have a mapping for this IOAPIC pin */
801 if ((irq
->mpc_dstapic
== intsrc
.mpc_dstapic
) &&
802 (irq
->mpc_dstirq
== i
))
806 if (idx
!= mp_irq_entries
) {
807 printk(KERN_DEBUG
"ACPI: IRQ%d used by override.\n", i
);
808 continue; /* IRQ already used */
811 intsrc
.mpc_irqtype
= mp_INT
;
812 intsrc
.mpc_srcbusirq
= i
; /* Identity mapped */
813 intsrc
.mpc_dstirq
= i
;
815 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
816 "%d-%d\n", intsrc
.mpc_irqtype
, intsrc
.mpc_irqflag
& 3,
817 (intsrc
.mpc_irqflag
>> 2) & 3, intsrc
.mpc_srcbus
,
818 intsrc
.mpc_srcbusirq
, intsrc
.mpc_dstapic
,
821 mp_irqs
[mp_irq_entries
] = intsrc
;
822 if (++mp_irq_entries
== MAX_IRQ_SOURCES
)
823 panic("Max # of irq sources exceeded!\n");
827 int mp_register_gsi(u32 gsi
, int triggering
, int polarity
)
833 if (acpi_irq_model
!= ACPI_IRQ_MODEL_IOAPIC
)
836 /* Don't set up the ACPI SCI because it's already set up */
837 if (acpi_gbl_FADT
.sci_interrupt
== gsi
)
840 ioapic
= mp_find_ioapic(gsi
);
842 printk(KERN_WARNING
"No IOAPIC for GSI %u\n", gsi
);
846 ioapic_pin
= gsi
- mp_ioapic_routing
[ioapic
].gsi_start
;
849 * Avoid pin reprogramming. PRTs typically include entries
850 * with redundant pin->gsi mappings (but unique PCI devices);
851 * we only program the IOAPIC on the first.
853 bit
= ioapic_pin
% 32;
854 idx
= (ioapic_pin
< 32) ? 0 : (ioapic_pin
/ 32);
856 printk(KERN_ERR
"Invalid reference to IOAPIC pin "
857 "%d-%d\n", mp_ioapic_routing
[ioapic
].apic_id
,
861 if ((1<<bit
) & mp_ioapic_routing
[ioapic
].pin_programmed
[idx
]) {
862 Dprintk(KERN_DEBUG
"Pin %d-%d already programmed\n",
863 mp_ioapic_routing
[ioapic
].apic_id
, ioapic_pin
);
867 mp_ioapic_routing
[ioapic
].pin_programmed
[idx
] |= (1<<bit
);
869 io_apic_set_pci_routing(ioapic
, ioapic_pin
, gsi
,
870 triggering
== ACPI_EDGE_SENSITIVE
? 0 : 1,
871 polarity
== ACPI_ACTIVE_HIGH
? 0 : 1);
874 #endif /*CONFIG_ACPI*/