include/asm-x86/smp_32.h

   1 #ifndef __ASM_SMP_H
   2 #define __ASM_SMP_H
   3
   4 #ifndef __ASSEMBLY__
   5 #include <linux/cpumask.h>
   6 #include <linux/init.h>
   7
   8 /*
   9  * We need the APIC definitions automatically as part of 'smp.h'
  10  */
  11 #ifdef CONFIG_X86_LOCAL_APIC
  12 # include <asm/mpspec.h>
  13 # include <asm/apic.h>
  14 # ifdef CONFIG_X86_IO_APIC
  15 #  include <asm/io_apic.h>
  16 # endif
  17 #endif
  18
  19 extern cpumask_t cpu_callin_map;
  20
  21 extern void (*mtrr_hook)(void);
  22 extern void zap_low_mappings(void);
  23
  24 #ifdef CONFIG_SMP
  25 /*
  26  * This function is needed by all SMP systems. It must _always_ be valid
  27  * from the initial startup. We map APIC_BASE very early in page_setup(),
  28  * so this is correct in the x86 case.
  29  */
  30 DECLARE_PER_CPU(int, cpu_number);
  31 #define raw_smp_processor_id() (x86_read_percpu(cpu_number))
  32
  33 extern int safe_smp_processor_id(void);
  34
  35 /* We don't mark CPUs online until __cpu_up(), so we need another measure */
  36 static inline int num_booting_cpus(void)
  37 {
  38         return cpus_weight(cpu_callout_map);
  39 }
  40
  41 #else /* CONFIG_SMP */
  42 #define safe_smp_processor_id()         0
  43 #endif /* !CONFIG_SMP */
  44
  45 #ifdef CONFIG_X86_LOCAL_APIC
  46
  47 static inline int logical_smp_processor_id(void)
  48 {
  49         /* we don't want to mark this access volatile - bad code generation */
  50         return GET_APIC_LOGICAL_ID(*(u32 *)(APIC_BASE + APIC_LDR));
  51 }
  52
  53 # ifdef APIC_DEFINITION
  54 extern int hard_smp_processor_id(void);
  55 # else
  56 #  include <mach_apicdef.h>
  57 static inline int hard_smp_processor_id(void)
  58 {
  59         /* we don't want to mark this access volatile - bad code generation */
  60         return GET_APIC_ID(*(u32 *)(APIC_BASE + APIC_ID));
  61 }
  62 # endif /* APIC_DEFINITION */
  63
  64 #else /* CONFIG_X86_LOCAL_APIC */
  65
  66 # ifndef CONFIG_SMP
  67 #  define hard_smp_processor_id()       0
  68 # endif
  69
  70 #endif /* CONFIG_X86_LOCAL_APIC */
  71
  72 #endif /* !ASSEMBLY */
  73 #endif