LXR linux/arch/arm/include/asm/smp

   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 <linux/cpumask.h>
   9#include <linux/err.h>
  10
  11#include <asm/cputype.h>
  12
  13/*
  14 * Return true if we are running on a SMP platform
  15 */
  16static inline bool is_smp(void)
  17{
  18#ifndef CONFIG_SMP
  19        return false;
  20#elif defined(CONFIG_SMP_ON_UP)
  21        extern unsigned int smp_on_up;
  22        return !!smp_on_up;
  23#else
  24        return true;
  25#endif
  26}
  27
  28/* all SMP configurations have the extended CPUID registers */
  29#ifndef CONFIG_MMU
  30#define tlb_ops_need_broadcast()        0
  31#else
  32static inline int tlb_ops_need_broadcast(void)
  33{
  34        if (!is_smp())
  35                return 0;
  36
  37        return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 2;
  38}
  39#endif
  40
  41#if !defined(CONFIG_SMP) || __LINUX_ARM_ARCH__ >= 7
  42#define cache_ops_need_broadcast()      0
  43#else
  44static inline int cache_ops_need_broadcast(void)
  45{
  46        if (!is_smp())
  47                return 0;
  48
  49        return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 1;
  50}
  51#endif
  52
  53/*
  54 * Logical CPU mapping.
  55 */
  56extern u32 __cpu_logical_map[];
  57#define cpu_logical_map(cpu)    __cpu_logical_map[cpu]
  58/*
  59 * Retrieve logical cpu index corresponding to a given MPIDR[23:0]
  60 *  - mpidr: MPIDR[23:0] to be used for the look-up
  61 *
  62 * Returns the cpu logical index or -EINVAL on look-up error
  63 */
  64static inline int get_logical_index(u32 mpidr)
  65{
  66        int cpu;
  67        for (cpu = 0; cpu < nr_cpu_ids; cpu++)
  68                if (cpu_logical_map(cpu) == mpidr)
  69                        return cpu;
  70        return -EINVAL;
  71}
  72
  73/*
  74 * NOTE ! Assembly code relies on the following
  75 * structure memory layout in order to carry out load
  76 * multiple from its base address. For more
  77 * information check arch/arm/kernel/sleep.S
  78 */
  79struct mpidr_hash {
  80        u32     mask; /* used by sleep.S */
  81        u32     shift_aff[3]; /* used by sleep.S */
  82        u32     bits;
  83};
  84
  85extern struct mpidr_hash mpidr_hash;
  86
  87static inline u32 mpidr_hash_size(void)
  88{
  89        return 1 << mpidr_hash.bits;
  90}
  91
  92extern int platform_can_cpu_hotplug(void);
  93
  94#endif
  95