include/asm-x86_64/smp.h

   1 #ifndef __ASM_SMP_H
   2 #define __ASM_SMP_H
   3
   4 /*
   5  * We need the APIC definitions automatically as part of 'smp.h'
   6  */
   7 #include <linux/threads.h>
   8 #include <linux/cpumask.h>
   9 #include <linux/bitops.h>
  10 extern int disable_apic;
  11
  12 #include <asm/fixmap.h>
  13 #include <asm/mpspec.h>
  14 #include <asm/io_apic.h>
  15 #include <asm/apic.h>
  16 #include <asm/thread_info.h>
  17
  18 #ifdef CONFIG_SMP
  19
  20 #include <asm/pda.h>
  21
  22 struct pt_regs;
  23
  24 extern cpumask_t cpu_present_mask;
  25 extern cpumask_t cpu_possible_map;
  26 extern cpumask_t cpu_online_map;
  27 extern cpumask_t cpu_callout_map;
  28 extern cpumask_t cpu_initialized;
  29
  30 /*
  31  * Private routines/data
  32  */
  33
  34 extern void smp_alloc_memory(void);
  35 extern volatile unsigned long smp_invalidate_needed;
  36 extern void lock_ipi_call_lock(void);
  37 extern void unlock_ipi_call_lock(void);
  38 extern int smp_num_siblings;
  39 extern void smp_send_reschedule(int cpu);
  40 void smp_stop_cpu(void);
  41 extern int smp_call_function_single(int cpuid, void (*func) (void *info),
  42                                 void *info, int retry, int wait);
  43
  44 extern cpumask_t cpu_sibling_map[NR_CPUS];
  45 extern cpumask_t cpu_core_map[NR_CPUS];
  46 extern u8 cpu_llc_id[NR_CPUS];
  47
  48 #define SMP_TRAMPOLINE_BASE 0x6000
  49
  50 /*
  51  * On x86 all CPUs are mapped 1:1 to the APIC space.
  52  * This simplifies scheduling and IPI sending and
  53  * compresses data structures.
  54  */
  55
  56 static inline int num_booting_cpus(void)
  57 {
  58         return cpus_weight(cpu_callout_map);
  59 }
  60
  61 #define raw_smp_processor_id() read_pda(cpunumber)
  62
  63 static inline int hard_smp_processor_id(void)
  64 {
  65         /* we don't want to mark this access volatile - bad code generation */
  66         return GET_APIC_ID(*(unsigned int *)(APIC_BASE+APIC_ID));
  67 }
  68
  69 extern int safe_smp_processor_id(void);
  70 extern int __cpu_disable(void);
  71 extern void __cpu_die(unsigned int cpu);
  72 extern void prefill_possible_map(void);
  73 extern unsigned num_processors;
  74 extern unsigned disabled_cpus;
  75
  76 #define NO_PROC_ID              0xFF            /* No processor magic marker */
  77
  78 #endif
  79
  80 /*
  81  * Some lowlevel functions might want to know about
  82  * the real APIC ID <-> CPU # mapping.
  83  */
  84 extern u8 x86_cpu_to_apicid[NR_CPUS];   /* physical ID */
  85 extern u8 x86_cpu_to_log_apicid[NR_CPUS];
  86 extern u8 bios_cpu_apicid[];
  87
  88 static inline unsigned int cpu_mask_to_apicid(cpumask_t cpumask)
  89 {
  90         return cpus_addr(cpumask)[0];
  91 }
  92
  93 static inline int cpu_present_to_apicid(int mps_cpu)
  94 {
  95         if (mps_cpu < NR_CPUS)
  96                 return (int)bios_cpu_apicid[mps_cpu];
  97         else
  98                 return BAD_APICID;
  99 }
 100
 101 #ifndef CONFIG_SMP
 102 #define stack_smp_processor_id() 0
 103 #define safe_smp_processor_id() 0
 104 #define cpu_logical_map(x) (x)
 105 #else
 106 #include <asm/thread_info.h>
 107 #define stack_smp_processor_id() \
 108 ({                                                              \
 109         struct thread_info *ti;                                 \
 110         __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));      \
 111         ti->cpu;                                                \
 112 })
 113 #endif
 114
 115 static __inline int logical_smp_processor_id(void)
 116 {
 117         /* we don't want to mark this access volatile - bad code generation */
 118         return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR));
 119 }
 120
 121 #ifdef CONFIG_SMP
 122 #define cpu_physical_id(cpu)            x86_cpu_to_apicid[cpu]
 123 #else
 124 #define cpu_physical_id(cpu)            boot_cpu_id
 125 static inline int smp_call_function_single(int cpuid, void (*func) (void *info),
 126                                 void *info, int retry, int wait)
 127 {
 128         /* Disable interrupts here? */
 129         func(info);
 130         return 0;
 131 }
 132 #endif /* !CONFIG_SMP */
 133 #endif
 134