01a2f43556
Add a smp_ops interface. This abstracts the API defined by <linux/smp.h> for use within arch/i386. The primary intent is that it be used by a paravirtualizing hypervisor to implement SMP, but it could also be used by non-APIC-using sub-architectures. This is related to CONFIG_PARAVIRT, but is implemented unconditionally since it is simpler that way and not a highly performance-sensitive interface. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
171 lines
3.8 KiB
C
171 lines
3.8 KiB
C
#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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/*
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* We need the APIC definitions automatically as part of 'smp.h'
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*/
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <asm/pda.h>
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#endif
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#if defined(CONFIG_X86_LOCAL_APIC) && !defined(__ASSEMBLY__)
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#include <asm/bitops.h>
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#include <asm/mpspec.h>
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#include <asm/apic.h>
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#ifdef CONFIG_X86_IO_APIC
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#include <asm/io_apic.h>
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#endif
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#endif
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#define BAD_APICID 0xFFu
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#ifdef CONFIG_SMP
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#ifndef __ASSEMBLY__
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/*
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* Private routines/data
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*/
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extern void smp_alloc_memory(void);
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extern int pic_mode;
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extern int smp_num_siblings;
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extern cpumask_t cpu_sibling_map[];
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extern cpumask_t cpu_core_map[];
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extern void (*mtrr_hook) (void);
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extern void zap_low_mappings (void);
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extern void lock_ipi_call_lock(void);
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extern void unlock_ipi_call_lock(void);
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#define MAX_APICID 256
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extern u8 x86_cpu_to_apicid[];
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#define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu]
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#ifdef CONFIG_HOTPLUG_CPU
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extern void cpu_exit_clear(void);
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extern void cpu_uninit(void);
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#endif
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struct smp_ops
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{
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void (*smp_prepare_boot_cpu)(void);
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void (*smp_prepare_cpus)(unsigned max_cpus);
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int (*cpu_up)(unsigned cpu);
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void (*smp_cpus_done)(unsigned max_cpus);
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void (*smp_send_stop)(void);
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void (*smp_send_reschedule)(int cpu);
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int (*smp_call_function_mask)(cpumask_t mask,
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void (*func)(void *info), void *info,
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int wait);
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};
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extern struct smp_ops smp_ops;
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static inline void smp_prepare_boot_cpu(void)
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{
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smp_ops.smp_prepare_boot_cpu();
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}
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static inline void smp_prepare_cpus(unsigned int max_cpus)
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{
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smp_ops.smp_prepare_cpus(max_cpus);
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}
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static inline int __cpu_up(unsigned int cpu)
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{
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return smp_ops.cpu_up(cpu);
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}
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static inline void smp_cpus_done(unsigned int max_cpus)
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{
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smp_ops.smp_cpus_done(max_cpus);
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}
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static inline void smp_send_stop(void)
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{
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smp_ops.smp_send_stop();
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}
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static inline void smp_send_reschedule(int cpu)
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{
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smp_ops.smp_send_reschedule(cpu);
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}
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static inline int smp_call_function_mask(cpumask_t mask,
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void (*func) (void *info), void *info,
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int wait)
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{
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return smp_ops.smp_call_function_mask(mask, func, info, wait);
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}
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void native_smp_prepare_boot_cpu(void);
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void native_smp_prepare_cpus(unsigned int max_cpus);
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int native_cpu_up(unsigned int cpunum);
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void native_smp_cpus_done(unsigned int max_cpus);
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#ifndef CONFIG_PARAVIRT
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#define startup_ipi_hook(phys_apicid, start_eip, start_esp) \
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do { } while (0)
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#endif
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/*
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* This function is needed by all SMP systems. It must _always_ be valid
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* from the initial startup. We map APIC_BASE very early in page_setup(),
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* so this is correct in the x86 case.
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*/
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#define raw_smp_processor_id() (read_pda(cpu_number))
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extern cpumask_t cpu_callout_map;
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extern cpumask_t cpu_callin_map;
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extern cpumask_t cpu_possible_map;
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/* We don't mark CPUs online until __cpu_up(), so we need another measure */
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static inline int num_booting_cpus(void)
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{
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return cpus_weight(cpu_callout_map);
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}
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#ifdef CONFIG_X86_LOCAL_APIC
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#ifdef APIC_DEFINITION
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extern int hard_smp_processor_id(void);
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#else
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#include <mach_apicdef.h>
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static inline int hard_smp_processor_id(void)
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{
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/* we don't want to mark this access volatile - bad code generation */
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return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID));
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}
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#endif
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#endif
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extern int safe_smp_processor_id(void);
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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extern unsigned int num_processors;
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#endif /* !__ASSEMBLY__ */
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#else /* CONFIG_SMP */
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#define safe_smp_processor_id() 0
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#define cpu_physical_id(cpu) boot_cpu_physical_apicid
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#endif
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#ifndef __ASSEMBLY__
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extern u8 apicid_2_node[];
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#ifdef CONFIG_X86_LOCAL_APIC
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static __inline int logical_smp_processor_id(void)
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{
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/* we don't want to mark this access volatile - bad code generation */
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return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR));
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}
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#endif
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#endif
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#endif
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