smp.h 3.5 KB

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  1. #ifndef __LINUX_SMP_H
  2. #define __LINUX_SMP_H
  3. /*
  4. * Generic SMP support
  5. * Alan Cox. <alan@redhat.com>
  6. */
  7. extern void cpu_idle(void);
  8. #ifdef CONFIG_SMP
  9. #include <linux/preempt.h>
  10. #include <linux/kernel.h>
  11. #include <linux/compiler.h>
  12. #include <linux/thread_info.h>
  13. #include <asm/smp.h>
  14. /*
  15. * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
  16. * (defined in asm header):
  17. */
  18. /*
  19. * stops all CPUs but the current one:
  20. */
  21. extern void smp_send_stop(void);
  22. /*
  23. * sends a 'reschedule' event to another CPU:
  24. */
  25. extern void smp_send_reschedule(int cpu);
  26. /*
  27. * Prepare machine for booting other CPUs.
  28. */
  29. extern void smp_prepare_cpus(unsigned int max_cpus);
  30. /*
  31. * Bring a CPU up
  32. */
  33. extern int __cpu_up(unsigned int cpunum);
  34. /*
  35. * Final polishing of CPUs
  36. */
  37. extern void smp_cpus_done(unsigned int max_cpus);
  38. /*
  39. * Call a function on all other processors
  40. */
  41. int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
  42. int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
  43. int retry, int wait);
  44. /*
  45. * Call a function on all processors
  46. */
  47. int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
  48. #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
  49. #define MSG_ALL 0x8001
  50. #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
  51. #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
  52. * when rebooting
  53. */
  54. #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
  55. #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
  56. /*
  57. * Mark the boot cpu "online" so that it can call console drivers in
  58. * printk() and can access its per-cpu storage.
  59. */
  60. void smp_prepare_boot_cpu(void);
  61. #else /* !SMP */
  62. /*
  63. * These macros fold the SMP functionality into a single CPU system
  64. */
  65. #define raw_smp_processor_id() 0
  66. #define hard_smp_processor_id() 0
  67. static inline int up_smp_call_function(void)
  68. {
  69. return 0;
  70. }
  71. #define smp_call_function(func,info,retry,wait) (up_smp_call_function())
  72. #define on_each_cpu(func,info,retry,wait) \
  73. ({ \
  74. local_irq_disable(); \
  75. func(info); \
  76. local_irq_enable(); \
  77. 0; \
  78. })
  79. static inline void smp_send_reschedule(int cpu) { }
  80. #define num_booting_cpus() 1
  81. #define smp_prepare_boot_cpu() do {} while (0)
  82. static inline int smp_call_function_single(int cpuid, void (*func) (void *info),
  83. void *info, int retry, int wait)
  84. {
  85. /* Disable interrupts here? */
  86. func(info);
  87. return 0;
  88. }
  89. #endif /* !SMP */
  90. /*
  91. * smp_processor_id(): get the current CPU ID.
  92. *
  93. * if DEBUG_PREEMPT is enabled the we check whether it is
  94. * used in a preemption-safe way. (smp_processor_id() is safe
  95. * if it's used in a preemption-off critical section, or in
  96. * a thread that is bound to the current CPU.)
  97. *
  98. * NOTE: raw_smp_processor_id() is for internal use only
  99. * (smp_processor_id() is the preferred variant), but in rare
  100. * instances it might also be used to turn off false positives
  101. * (i.e. smp_processor_id() use that the debugging code reports but
  102. * which use for some reason is legal). Don't use this to hack around
  103. * the warning message, as your code might not work under PREEMPT.
  104. */
  105. #ifdef CONFIG_DEBUG_PREEMPT
  106. extern unsigned int debug_smp_processor_id(void);
  107. # define smp_processor_id() debug_smp_processor_id()
  108. #else
  109. # define smp_processor_id() raw_smp_processor_id()
  110. #endif
  111. #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
  112. #define put_cpu() preempt_enable()
  113. #define put_cpu_no_resched() preempt_enable_no_resched()
  114. void smp_setup_processor_id(void);
  115. #endif /* __LINUX_SMP_H */