2 * x86 SMP booting functions
4 * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
5 * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
7 * Much of the core SMP work is based on previous work by Thomas Radke, to
8 * whom a great many thanks are extended.
10 * Thanks to Intel for making available several different Pentium,
11 * Pentium Pro and Pentium-II/Xeon MP machines.
12 * Original development of Linux SMP code supported by Caldera.
14 * This code is released under the GNU General Public License version 2 or
18 * Felix Koop : NR_CPUS used properly
19 * Jose Renau : Handle single CPU case.
20 * Alan Cox : By repeated request 8) - Total BogoMIPS report.
21 * Greg Wright : Fix for kernel stacks panic.
22 * Erich Boleyn : MP v1.4 and additional changes.
23 * Matthias Sattler : Changes for 2.1 kernel map.
24 * Michel Lespinasse : Changes for 2.1 kernel map.
25 * Michael Chastain : Change trampoline.S to gnu as.
26 * Alan Cox : Dumb bug: 'B' step PPro's are fine
27 * Ingo Molnar : Added APIC timers, based on code
29 * Ingo Molnar : various cleanups and rewrites
30 * Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug.
31 * Maciej W. Rozycki : Bits for genuine 82489DX APICs
32 * Martin J. Bligh : Added support for multi-quad systems
33 * Dave Jones : Report invalid combinations of Athlon CPUs.
34 * Rusty Russell : Hacked into shape for new "hotplug" boot process. */
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/kernel.h>
41 #include <linux/sched.h>
42 #include <linux/kernel_stat.h>
43 #include <linux/bootmem.h>
44 #include <linux/notifier.h>
45 #include <linux/cpu.h>
46 #include <linux/percpu.h>
47 #include <linux/nmi.h>
49 #include <linux/delay.h>
50 #include <linux/mc146818rtc.h>
51 #include <asm/tlbflush.h>
53 #include <asm/arch_hooks.h>
56 #include <mach_apic.h>
57 #include <mach_wakecpu.h>
58 #include <smpboot_hooks.h>
62 /* which logical CPU number maps to which CPU (physical APIC ID) */
63 u16 x86_cpu_to_apicid_init
[NR_CPUS
] __initdata
=
64 { [0 ... NR_CPUS
-1] = BAD_APICID
};
65 void *x86_cpu_to_apicid_early_ptr
;
66 DEFINE_PER_CPU(u16
, x86_cpu_to_apicid
) = BAD_APICID
;
67 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid
);
69 u16 x86_bios_cpu_apicid_init
[NR_CPUS
] __initdata
70 = { [0 ... NR_CPUS
-1] = BAD_APICID
};
71 void *x86_bios_cpu_apicid_early_ptr
;
72 DEFINE_PER_CPU(u16
, x86_bios_cpu_apicid
) = BAD_APICID
;
73 EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid
);
75 u8 apicid_2_node
[MAX_APICID
];
77 static void map_cpu_to_logical_apicid(void);
79 /* State of each CPU. */
80 DEFINE_PER_CPU(int, cpu_state
) = { 0 };
82 /* Store all idle threads, this can be reused instead of creating
83 * a new thread. Also avoids complicated thread destroy functionality
86 #ifdef CONFIG_HOTPLUG_CPU
88 * Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
89 * removed after init for !CONFIG_HOTPLUG_CPU.
91 static DEFINE_PER_CPU(struct task_struct
*, idle_thread_array
);
92 #define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
93 #define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p))
95 struct task_struct
*idle_thread_array
[NR_CPUS
] __cpuinitdata
;
96 #define get_idle_for_cpu(x) (idle_thread_array[(x)])
97 #define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p))
100 static atomic_t init_deasserted
;
102 static void __cpuinit
smp_callin(void)
105 unsigned long timeout
;
108 * If waken up by an INIT in an 82489DX configuration
109 * we may get here before an INIT-deassert IPI reaches
110 * our local APIC. We have to wait for the IPI or we'll
111 * lock up on an APIC access.
113 wait_for_init_deassert(&init_deasserted
);
116 * (This works even if the APIC is not enabled.)
118 phys_id
= GET_APIC_ID(apic_read(APIC_ID
));
119 cpuid
= smp_processor_id();
120 if (cpu_isset(cpuid
, cpu_callin_map
)) {
121 printk("huh, phys CPU#%d, CPU#%d already present??\n",
125 Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid
, phys_id
);
128 * STARTUP IPIs are fragile beasts as they might sometimes
129 * trigger some glue motherboard logic. Complete APIC bus
130 * silence for 1 second, this overestimates the time the
131 * boot CPU is spending to send the up to 2 STARTUP IPIs
132 * by a factor of two. This should be enough.
136 * Waiting 2s total for startup (udelay is not yet working)
138 timeout
= jiffies
+ 2*HZ
;
139 while (time_before(jiffies
, timeout
)) {
141 * Has the boot CPU finished it's STARTUP sequence?
143 if (cpu_isset(cpuid
, cpu_callout_map
))
148 if (!time_before(jiffies
, timeout
)) {
149 printk("BUG: CPU%d started up but did not get a callout!\n",
155 * the boot CPU has finished the init stage and is spinning
156 * on callin_map until we finish. We are free to set up this
157 * CPU, first the APIC. (this is probably redundant on most
161 Dprintk("CALLIN, before setup_local_APIC().\n");
162 smp_callin_clear_local_apic();
164 map_cpu_to_logical_apicid();
170 Dprintk("Stack at about %p\n",&cpuid
);
173 * Save our processor parameters
175 smp_store_cpu_info(cpuid
);
178 * Allow the master to continue.
180 cpu_set(cpuid
, cpu_callin_map
);
184 * Activate a secondary processor.
186 static void __cpuinit
start_secondary(void *unused
)
189 * Don't put *anything* before cpu_init(), SMP booting is too
190 * fragile that we want to limit the things done here to the
191 * most necessary things.
200 /* otherwise gcc will move up smp_processor_id before the cpu_init */
203 * Check TSC synchronization with the BP:
205 check_tsc_sync_target();
207 if (nmi_watchdog
== NMI_IO_APIC
) {
208 disable_8259A_irq(0);
209 enable_NMI_through_LVT0();
213 /* This must be done before setting cpu_online_map */
214 set_cpu_sibling_map(raw_smp_processor_id());
218 * We need to hold call_lock, so there is no inconsistency
219 * between the time smp_call_function() determines number of
220 * IPI recipients, and the time when the determination is made
221 * for which cpus receive the IPI. Holding this
222 * lock helps us to not include this cpu in a currently in progress
223 * smp_call_function().
225 lock_ipi_call_lock();
226 cpu_set(smp_processor_id(), cpu_online_map
);
227 unlock_ipi_call_lock();
228 per_cpu(cpu_state
, smp_processor_id()) = CPU_ONLINE
;
230 setup_secondary_clock();
237 * Everything has been set up for the secondary
238 * CPUs - they just need to reload everything
239 * from the task structure
240 * This function must not return.
242 void __devinit
initialize_secondary(void)
245 * We don't actually need to load the full TSS,
246 * basically just the stack pointer and the ip.
253 :"m" (current
->thread
.sp
),"m" (current
->thread
.ip
));
256 /* Static state in head.S used to set up a CPU */
264 /* which logical CPUs are on which nodes */
265 cpumask_t node_to_cpumask_map
[MAX_NUMNODES
] __read_mostly
=
266 { [0 ... MAX_NUMNODES
-1] = CPU_MASK_NONE
};
267 EXPORT_SYMBOL(node_to_cpumask_map
);
268 /* which node each logical CPU is on */
269 int cpu_to_node_map
[NR_CPUS
] __read_mostly
= { [0 ... NR_CPUS
-1] = 0 };
270 EXPORT_SYMBOL(cpu_to_node_map
);
272 /* set up a mapping between cpu and node. */
273 static inline void map_cpu_to_node(int cpu
, int node
)
275 printk("Mapping cpu %d to node %d\n", cpu
, node
);
276 cpu_set(cpu
, node_to_cpumask_map
[node
]);
277 cpu_to_node_map
[cpu
] = node
;
280 /* undo a mapping between cpu and node. */
281 static inline void unmap_cpu_to_node(int cpu
)
285 printk("Unmapping cpu %d from all nodes\n", cpu
);
286 for (node
= 0; node
< MAX_NUMNODES
; node
++)
287 cpu_clear(cpu
, node_to_cpumask_map
[node
]);
288 cpu_to_node_map
[cpu
] = 0;
290 #else /* !CONFIG_NUMA */
292 #define map_cpu_to_node(cpu, node) ({})
293 #define unmap_cpu_to_node(cpu) ({})
295 #endif /* CONFIG_NUMA */
297 u8 cpu_2_logical_apicid
[NR_CPUS
] __read_mostly
= { [0 ... NR_CPUS
-1] = BAD_APICID
};
299 static void map_cpu_to_logical_apicid(void)
301 int cpu
= smp_processor_id();
302 int apicid
= logical_smp_processor_id();
303 int node
= apicid_to_node(apicid
);
305 if (!node_online(node
))
306 node
= first_online_node
;
308 cpu_2_logical_apicid
[cpu
] = apicid
;
309 map_cpu_to_node(cpu
, node
);
312 static void unmap_cpu_to_logical_apicid(int cpu
)
314 cpu_2_logical_apicid
[cpu
] = BAD_APICID
;
315 unmap_cpu_to_node(cpu
);
318 static inline void __inquire_remote_apic(int apicid
)
320 unsigned i
, regs
[] = { APIC_ID
>> 4, APIC_LVR
>> 4, APIC_SPIV
>> 4 };
321 char *names
[] = { "ID", "VERSION", "SPIV" };
325 printk(KERN_INFO
"Inquiring remote APIC #%d...\n", apicid
);
327 for (i
= 0; i
< ARRAY_SIZE(regs
); i
++) {
328 printk(KERN_INFO
"... APIC #%d %s: ", apicid
, names
[i
]);
333 status
= safe_apic_wait_icr_idle();
336 "a previous APIC delivery may have failed\n");
338 apic_write_around(APIC_ICR2
, SET_APIC_DEST_FIELD(apicid
));
339 apic_write_around(APIC_ICR
, APIC_DM_REMRD
| regs
[i
]);
344 status
= apic_read(APIC_ICR
) & APIC_ICR_RR_MASK
;
345 } while (status
== APIC_ICR_RR_INPROG
&& timeout
++ < 1000);
348 case APIC_ICR_RR_VALID
:
349 status
= apic_read(APIC_RRR
);
350 printk(KERN_CONT
"%08x\n", status
);
353 printk(KERN_CONT
"failed\n");
358 #ifdef WAKE_SECONDARY_VIA_NMI
360 * Poke the other CPU in the eye via NMI to wake it up. Remember that the normal
361 * INIT, INIT, STARTUP sequence will reset the chip hard for us, and this
362 * won't ... remember to clear down the APIC, etc later.
365 wakeup_secondary_cpu(int logical_apicid
, unsigned long start_eip
)
367 unsigned long send_status
, accept_status
= 0;
371 apic_write_around(APIC_ICR2
, SET_APIC_DEST_FIELD(logical_apicid
));
373 /* Boot on the stack */
374 /* Kick the second */
375 apic_write_around(APIC_ICR
, APIC_DM_NMI
| APIC_DEST_LOGICAL
);
377 Dprintk("Waiting for send to finish...\n");
378 send_status
= safe_apic_wait_icr_idle();
381 * Give the other CPU some time to accept the IPI.
385 * Due to the Pentium erratum 3AP.
387 maxlvt
= lapic_get_maxlvt();
389 apic_read_around(APIC_SPIV
);
390 apic_write(APIC_ESR
, 0);
392 accept_status
= (apic_read(APIC_ESR
) & 0xEF);
393 Dprintk("NMI sent.\n");
396 printk("APIC never delivered???\n");
398 printk("APIC delivery error (%lx).\n", accept_status
);
400 return (send_status
| accept_status
);
402 #endif /* WAKE_SECONDARY_VIA_NMI */
404 #ifdef WAKE_SECONDARY_VIA_INIT
406 wakeup_secondary_cpu(int phys_apicid
, unsigned long start_eip
)
408 unsigned long send_status
, accept_status
= 0;
409 int maxlvt
, num_starts
, j
;
412 * Be paranoid about clearing APIC errors.
414 if (APIC_INTEGRATED(apic_version
[phys_apicid
])) {
415 apic_read_around(APIC_SPIV
);
416 apic_write(APIC_ESR
, 0);
420 Dprintk("Asserting INIT.\n");
423 * Turn INIT on target chip
425 apic_write_around(APIC_ICR2
, SET_APIC_DEST_FIELD(phys_apicid
));
430 apic_write_around(APIC_ICR
, APIC_INT_LEVELTRIG
| APIC_INT_ASSERT
433 Dprintk("Waiting for send to finish...\n");
434 send_status
= safe_apic_wait_icr_idle();
438 Dprintk("Deasserting INIT.\n");
441 apic_write_around(APIC_ICR2
, SET_APIC_DEST_FIELD(phys_apicid
));
444 apic_write_around(APIC_ICR
, APIC_INT_LEVELTRIG
| APIC_DM_INIT
);
446 Dprintk("Waiting for send to finish...\n");
447 send_status
= safe_apic_wait_icr_idle();
450 atomic_set(&init_deasserted
, 1);
453 * Should we send STARTUP IPIs ?
455 * Determine this based on the APIC version.
456 * If we don't have an integrated APIC, don't send the STARTUP IPIs.
458 if (APIC_INTEGRATED(apic_version
[phys_apicid
]))
464 * Paravirt / VMI wants a startup IPI hook here to set up the
465 * target processor state.
467 startup_ipi_hook(phys_apicid
, (unsigned long) start_secondary
,
468 (unsigned long) stack_start
.sp
);
471 * Run STARTUP IPI loop.
473 Dprintk("#startup loops: %d.\n", num_starts
);
475 maxlvt
= lapic_get_maxlvt();
477 for (j
= 1; j
<= num_starts
; j
++) {
478 Dprintk("Sending STARTUP #%d.\n",j
);
479 apic_read_around(APIC_SPIV
);
480 apic_write(APIC_ESR
, 0);
482 Dprintk("After apic_write.\n");
489 apic_write_around(APIC_ICR2
, SET_APIC_DEST_FIELD(phys_apicid
));
491 /* Boot on the stack */
492 /* Kick the second */
493 apic_write_around(APIC_ICR
, APIC_DM_STARTUP
494 | (start_eip
>> 12));
497 * Give the other CPU some time to accept the IPI.
501 Dprintk("Startup point 1.\n");
503 Dprintk("Waiting for send to finish...\n");
504 send_status
= safe_apic_wait_icr_idle();
507 * Give the other CPU some time to accept the IPI.
511 * Due to the Pentium erratum 3AP.
514 apic_read_around(APIC_SPIV
);
515 apic_write(APIC_ESR
, 0);
517 accept_status
= (apic_read(APIC_ESR
) & 0xEF);
518 if (send_status
|| accept_status
)
521 Dprintk("After Startup.\n");
524 printk("APIC never delivered???\n");
526 printk("APIC delivery error (%lx).\n", accept_status
);
528 return (send_status
| accept_status
);
530 #endif /* WAKE_SECONDARY_VIA_INIT */
532 extern cpumask_t cpu_initialized
;
535 struct work_struct work
;
536 struct task_struct
*idle
;
537 struct completion done
;
541 static void __cpuinit
do_fork_idle(struct work_struct
*work
)
543 struct create_idle
*c_idle
=
544 container_of(work
, struct create_idle
, work
);
546 c_idle
->idle
= fork_idle(c_idle
->cpu
);
547 complete(&c_idle
->done
);
549 static int __cpuinit
do_boot_cpu(int apicid
, int cpu
)
551 * NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
552 * (ie clustered apic addressing mode), this is a LOGICAL apic ID.
553 * Returns zero if CPU booted OK, else error code from wakeup_secondary_cpu.
556 unsigned long boot_error
;
558 unsigned long start_eip
;
559 unsigned short nmi_high
= 0, nmi_low
= 0;
560 struct create_idle c_idle
= {
562 .done
= COMPLETION_INITIALIZER_ONSTACK(c_idle
.done
),
564 INIT_WORK(&c_idle
.work
, do_fork_idle
);
567 * Save current MTRR state in case it was changed since early boot
568 * (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync:
572 c_idle
.idle
= get_idle_for_cpu(cpu
);
575 * We can't use kernel_thread since we must avoid to
576 * reschedule the child.
579 c_idle
.idle
->thread
.sp
= (unsigned long) (((struct pt_regs
*)
580 (THREAD_SIZE
+ task_stack_page(c_idle
.idle
))) - 1);
581 init_idle(c_idle
.idle
, cpu
);
585 if (!keventd_up() || current_is_keventd())
586 c_idle
.work
.func(&c_idle
.work
);
588 schedule_work(&c_idle
.work
);
589 wait_for_completion(&c_idle
.done
);
592 if (IS_ERR(c_idle
.idle
)) {
593 printk(KERN_ERR
"failed fork for CPU %d\n", cpu
);
594 return PTR_ERR(c_idle
.idle
);
597 set_idle_for_cpu(cpu
, c_idle
.idle
);
599 per_cpu(current_task
, cpu
) = c_idle
.idle
;
601 early_gdt_descr
.address
= (unsigned long)get_cpu_gdt_table(cpu
);
603 c_idle
.idle
->thread
.ip
= (unsigned long) start_secondary
;
604 /* start_eip had better be page-aligned! */
605 start_eip
= setup_trampoline();
607 alternatives_smp_switch(1);
609 /* So we see what's up */
610 printk("Booting processor %d/%d ip %lx\n", cpu
, apicid
, start_eip
);
611 /* Stack for startup_32 can be just as for start_secondary onwards */
612 stack_start
.sp
= (void *) c_idle
.idle
->thread
.sp
;
617 * This grunge runs the startup process for
618 * the targeted processor.
621 atomic_set(&init_deasserted
, 0);
623 Dprintk("Setting warm reset code and vector.\n");
625 store_NMI_vector(&nmi_high
, &nmi_low
);
627 smpboot_setup_warm_reset_vector(start_eip
);
630 * Starting actual IPI sequence...
632 boot_error
= wakeup_secondary_cpu(apicid
, start_eip
);
636 * allow APs to start initializing.
638 Dprintk("Before Callout %d.\n", cpu
);
639 cpu_set(cpu
, cpu_callout_map
);
640 Dprintk("After Callout %d.\n", cpu
);
643 * Wait 5s total for a response
645 for (timeout
= 0; timeout
< 50000; timeout
++) {
646 if (cpu_isset(cpu
, cpu_callin_map
))
647 break; /* It has booted */
651 if (cpu_isset(cpu
, cpu_callin_map
)) {
652 /* number CPUs logically, starting from 1 (BSP is 0) */
654 printk("CPU%d: ", cpu
);
655 print_cpu_info(&cpu_data(cpu
));
656 Dprintk("CPU has booted.\n");
659 if (*((volatile unsigned char *)trampoline_base
)
661 /* trampoline started but...? */
662 printk("Stuck ??\n");
664 /* trampoline code not run */
665 printk("Not responding.\n");
666 inquire_remote_apic(apicid
);
671 /* Try to put things back the way they were before ... */
672 unmap_cpu_to_logical_apicid(cpu
);
673 cpu_clear(cpu
, cpu_callout_map
); /* was set here (do_boot_cpu()) */
674 cpu_clear(cpu
, cpu_initialized
); /* was set by cpu_init() */
675 cpu_clear(cpu
, cpu_possible_map
);
676 per_cpu(x86_cpu_to_apicid
, cpu
) = BAD_APICID
;
679 /* mark "stuck" area as not stuck */
680 *((volatile unsigned long *)trampoline_base
) = 0;
685 #ifdef CONFIG_HOTPLUG_CPU
686 void cpu_exit_clear(void)
688 int cpu
= raw_smp_processor_id();
695 cpu_clear(cpu
, cpu_callout_map
);
696 cpu_clear(cpu
, cpu_callin_map
);
698 unmap_cpu_to_logical_apicid(cpu
);
702 struct warm_boot_cpu_info
{
703 struct completion
*complete
;
704 struct work_struct task
;
709 static void __cpuinit
do_warm_boot_cpu(struct work_struct
*work
)
711 struct warm_boot_cpu_info
*info
=
712 container_of(work
, struct warm_boot_cpu_info
, task
);
713 do_boot_cpu(info
->apicid
, info
->cpu
);
714 complete(info
->complete
);
717 static void __cpuinit
__smp_prepare_cpu(int cpu
)
719 DECLARE_COMPLETION_ONSTACK(done
);
720 struct warm_boot_cpu_info info
;
723 apicid
= per_cpu(x86_cpu_to_apicid
, cpu
);
725 info
.complete
= &done
;
726 info
.apicid
= apicid
;
728 INIT_WORK(&info
.task
, do_warm_boot_cpu
);
730 /* init low mem mapping */
731 clone_pgd_range(swapper_pg_dir
, swapper_pg_dir
+ USER_PGD_PTRS
,
732 min_t(unsigned long, KERNEL_PGD_PTRS
, USER_PGD_PTRS
));
734 if (!keventd_up() || current_is_keventd())
735 info
.task
.func(&info
.task
);
737 schedule_work(&info
.task
);
738 wait_for_completion(&done
);
742 static int boot_cpu_logical_apicid
;
743 /* Where the IO area was mapped on multiquad, always 0 otherwise */
745 #ifdef CONFIG_X86_NUMAQ
746 EXPORT_SYMBOL(xquad_portio
);
749 static void __init
disable_smp(void)
751 cpu_possible_map
= cpumask_of_cpu(0);
752 cpu_present_map
= cpumask_of_cpu(0);
753 smpboot_clear_io_apic_irqs();
754 phys_cpu_present_map
= physid_mask_of_physid(0);
755 map_cpu_to_logical_apicid();
756 cpu_set(0, per_cpu(cpu_sibling_map
, 0));
757 cpu_set(0, per_cpu(cpu_core_map
, 0));
760 static int __init
smp_sanity_check(unsigned max_cpus
)
763 * If we couldn't find an SMP configuration at boot time,
764 * get out of here now!
766 if (!smp_found_config
&& !acpi_lapic
) {
767 printk(KERN_NOTICE
"SMP motherboard not detected.\n");
769 if (APIC_init_uniprocessor())
770 printk(KERN_NOTICE
"Local APIC not detected."
771 " Using dummy APIC emulation.\n");
776 * Should not be necessary because the MP table should list the boot
777 * CPU too, but we do it for the sake of robustness anyway.
778 * Makes no sense to do this check in clustered apic mode, so skip it
780 if (!check_phys_apicid_present(boot_cpu_physical_apicid
)) {
781 printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
782 boot_cpu_physical_apicid
);
783 physid_set(hard_smp_processor_id(), phys_cpu_present_map
);
787 * If we couldn't find a local APIC, then get out of here now!
789 if (APIC_INTEGRATED(apic_version
[boot_cpu_physical_apicid
]) && !cpu_has_apic
) {
790 printk(KERN_ERR
"BIOS bug, local APIC #%d not detected!...\n",
791 boot_cpu_physical_apicid
);
792 printk(KERN_ERR
"... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
799 * If SMP should be disabled, then really disable it!
802 smp_found_config
= 0;
803 printk(KERN_INFO
"SMP mode deactivated, forcing use of dummy APIC emulation.\n");
805 if (nmi_watchdog
== NMI_LOCAL_APIC
) {
806 printk(KERN_INFO
"activating minimal APIC for NMI watchdog use.\n");
816 * Cycle through the processors sending APIC IPIs to boot each.
818 static void __init
smp_boot_cpus(unsigned int max_cpus
)
821 * Setup boot CPU information
823 smp_store_cpu_info(0); /* Final full version of the data */
824 printk(KERN_INFO
"CPU%d: ", 0);
825 print_cpu_info(&cpu_data(0));
827 boot_cpu_physical_apicid
= GET_APIC_ID(apic_read(APIC_ID
));
828 boot_cpu_logical_apicid
= logical_smp_processor_id();
830 current_thread_info()->cpu
= 0;
832 set_cpu_sibling_map(0);
834 if (smp_sanity_check(max_cpus
) < 0) {
835 printk(KERN_INFO
"SMP disabled\n");
842 map_cpu_to_logical_apicid();
845 setup_portio_remap();
847 smpboot_setup_io_apic();
852 /* These are wrappers to interface to the new boot process. Someone
853 who understands all this stuff should rewrite it properly. --RR 15/Jul/02 */
854 void __init
native_smp_prepare_cpus(unsigned int max_cpus
)
856 nmi_watchdog_default();
857 cpu_callin_map
= cpumask_of_cpu(0);
859 smp_boot_cpus(max_cpus
);
862 void __init
native_smp_prepare_boot_cpu(void)
864 unsigned int cpu
= smp_processor_id();
869 cpu_set(cpu
, cpu_callout_map
);
870 __get_cpu_var(cpu_state
) = CPU_ONLINE
;
873 int __cpuinit
native_cpu_up(unsigned int cpu
)
875 int apicid
= cpu_present_to_apicid(cpu
);
878 WARN_ON(irqs_disabled());
880 Dprintk("++++++++++++++++++++=_---CPU UP %u\n", cpu
);
882 if (apicid
== BAD_APICID
|| apicid
== boot_cpu_physical_apicid
||
883 !physid_isset(apicid
, phys_cpu_present_map
)) {
884 printk(KERN_ERR
"%s: bad cpu %d\n", __func__
, cpu
);
888 per_cpu(cpu_state
, cpu
) = CPU_UP_PREPARE
;
890 __smp_prepare_cpu(cpu
);
892 /* In case one didn't come up */
893 if (!cpu_isset(cpu
, cpu_callin_map
)) {
894 printk(KERN_DEBUG
"skipping cpu%d, didn't come online\n", cpu
);
900 * Check TSC synchronization with the AP (keep irqs disabled
903 local_irq_save(flags
);
904 check_tsc_sync_source(cpu
);
905 local_irq_restore(flags
);
907 while (!cpu_isset(cpu
, cpu_online_map
)) {
909 touch_nmi_watchdog();
915 extern void impress_friends(void);
916 extern void smp_checks(void);
918 void __init
native_smp_cpus_done(unsigned int max_cpus
)
921 * Cleanup possible dangling ends...
923 smpboot_restore_warm_reset_vector();
925 Dprintk("Boot done.\n");
929 #ifdef CONFIG_X86_IO_APIC
932 check_nmi_watchdog();