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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1#ifndef __ASM_SMP_H
2#define __ASM_SMP_H
3
4#include <linux/cpumask.h>
5#include <linux/init.h>
6
7/*
8 * We need the APIC definitions automatically as part of 'smp.h'
9 */
10#include <asm/apic.h>
11#include <asm/io_apic.h>
12#include <asm/mpspec.h>
13#include <asm/pda.h>
14#include <asm/thread_info.h>
15
16extern cpumask_t cpu_callout_map;
17extern cpumask_t cpu_initialized;
18
19extern int smp_num_siblings;
20extern unsigned int num_processors;
21
22extern void smp_alloc_memory(void);
23extern void lock_ipi_call_lock(void);
24extern void unlock_ipi_call_lock(void);
25
26extern int smp_call_function_mask(cpumask_t mask, void (*func)(void *),
27 void *info, int wait);
28
29extern u16 __initdata x86_cpu_to_apicid_init[];
30extern u16 __initdata x86_bios_cpu_apicid_init[];
31extern void *x86_cpu_to_apicid_early_ptr;
32extern void *x86_bios_cpu_apicid_early_ptr;
33
34DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
35DECLARE_PER_CPU(cpumask_t, cpu_core_map);
36DECLARE_PER_CPU(u16, cpu_llc_id);
37DECLARE_PER_CPU(u16, x86_cpu_to_apicid);
38DECLARE_PER_CPU(u16, x86_bios_cpu_apicid);
39
40static inline int cpu_present_to_apicid(int mps_cpu)
41{
42 if (cpu_present(mps_cpu))
43 return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
44 else
45 return BAD_APICID;
46}
47
48#ifdef CONFIG_SMP
49
50#define SMP_TRAMPOLINE_BASE 0x6000
51
52extern int __cpu_disable(void);
53extern void __cpu_die(unsigned int cpu);
54extern void prefill_possible_map(void);
55extern unsigned __cpuinitdata disabled_cpus;
56
57#define raw_smp_processor_id() read_pda(cpunumber)
58#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)
59
60#define stack_smp_processor_id() \
61 ({ \
62 struct thread_info *ti; \
63 __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK)); \
64 ti->cpu; \
65})
66
67/*
68 * On x86 all CPUs are mapped 1:1 to the APIC space. This simplifies
69 * scheduling and IPI sending and compresses data structures.
70 */
71static inline int num_booting_cpus(void)
72{
73 return cpus_weight(cpu_callout_map);
74}
75
76extern void smp_send_reschedule(int cpu);
77
78#else /* CONFIG_SMP */
79
80extern unsigned int boot_cpu_id;
81#define cpu_physical_id(cpu) boot_cpu_id
82#define stack_smp_processor_id() 0
83
84#endif /* !CONFIG_SMP */
85
86#define safe_smp_processor_id() smp_processor_id()
87
88static __inline int logical_smp_processor_id(void)
89{
90 /* we don't want to mark this access volatile - bad code generation */
91 return GET_APIC_LOGICAL_ID(*(u32 *)(APIC_BASE + APIC_LDR));
92}
93
94static inline int hard_smp_processor_id(void)
95{
96 /* we don't want to mark this access volatile - bad code generation */
97 return GET_APIC_ID(*(u32 *)(APIC_BASE + APIC_ID));
98}
99
100#endif
101