arch/arm/include/asm/smp_plat.h

   1 /*
   2  * ARM specific SMP header, this contains our implementation
   3  * details.
   4  */
   5 #ifndef __ASMARM_SMP_PLAT_H
   6 #define __ASMARM_SMP_PLAT_H
   7
   8 #include <asm/cputype.h>
   9
  10 /*
  11  * Return true if we are running on a SMP platform
  12  */
  13 static inline bool is_smp(void)
  14 {
  15 #ifndef CONFIG_SMP
  16         return false;
  17 #elif defined(CONFIG_SMP_ON_UP)
  18         extern unsigned int smp_on_up;
  19         return !!smp_on_up;
  20 #else
  21         return true;
  22 #endif
  23 }
  24
  25 /* all SMP configurations have the extended CPUID registers */
  26 static inline int tlb_ops_need_broadcast(void)
  27 {
  28         if (!is_smp())
  29                 return 0;
  30
  31         return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 2;
  32 }
  33
  34 #if !defined(CONFIG_SMP) || __LINUX_ARM_ARCH__ >= 7
  35 #define cache_ops_need_broadcast()      0
  36 #else
  37 static inline int cache_ops_need_broadcast(void)
  38 {
  39         if (!is_smp())
  40                 return 0;
  41
  42         return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 1;
  43 }
  44 #endif
  45
  46 /*
  47  * Logical CPU mapping.
  48  */
  49 extern int __cpu_logical_map[];
  50 #define cpu_logical_map(cpu)    __cpu_logical_map[cpu]
  51
  52 #endif