kernel/smp.h

   1 #ifndef __SMP_H__
   2 #define __SMP_H__
   3
   4 #ifdef CONFIG_SMP
   5
   6 #ifndef __ASSEMBLY__
   7
   8 #include "kernel.h"
   9 #include "arch_smp.h"
  10 #include "spinlock.h"
  11
  12 /* number of CPUs (execution strands in the system */
  13 EXTERN unsigned ncpus;
  14 /* Number of virtual strands per physical core */
  15 EXTERN unsigned ht_per_core;
  16 /* which cpu is bootstraping */
  17 EXTERN unsigned bsp_cpu_id;
  18
  19 #define cpu_is_bsp(cpu) (bsp_cpu_id == cpu)
  20
  21 /*
  22  * SMP initialization is largely architecture dependent and each architecture
  23  * must provide a method how to do it. If initiating SMP fails the function does
  24  * not report it. However it must put the system in such a state that it falls
  25  * back to a uniprocessor system. Although the uniprocessor configuration may be
  26  * suboptimal, the system must be able to run on the bootstrap processor as if
  27  * it was the only processor in the system
  28  */
  29 void smp_init(void);
  30
  31 #define CPU_IS_BSP      1
  32 #define CPU_IS_READY    2
  33
  34 struct cpu {
  35         u32_t flags;
  36 };
  37
  38 EXTERN struct cpu cpus[CONFIG_MAX_CPUS];
  39
  40 #define cpu_set_flag(cpu, flag) do { cpus[cpu].flags |= (flag); } while(0)
  41 #define cpu_clear_flag(cpu, flag) do { cpus[cpu].flags &= ~(flag); } while(0)
  42 #define cpu_test_flag(cpu, flag) (cpus[cpu].flags & (flag))
  43 #define cpu_is_ready(cpu) cpu_test_flag(cpu, CPU_IS_READY)
  44
  45 /*
  46  * Big Kernel Lock prevents more then one cpu executing the kernel code
  47  */
  48 SPINLOCK_DECLARE(big_kernel_lock)
  49 /*
  50  * to sync the booting APs
  51  */
  52 SPINLOCK_DECLARE(boot_lock)
  53
  54 void wait_for_APs_to_finish_booting(void);
  55 void ap_boot_finished(unsigned cpu);
  56 void smp_shutdown_aps(void );
  57
  58 /* IPI handlers */
  59 void smp_ipi_halt_handler(void);
  60 void smp_ipi_sched_handler(void);
  61
  62 void smp_schedule(unsigned cpu);
  63 /* stop a processes on a different cpu */
  64 void smp_schedule_stop_proc(struct proc * p);
  65 /* stop a process on a different cpu because its adress space is being changed */
  66 void smp_schedule_vminhibit(struct proc * p);
  67 /* stop the process and for saving its full context */
  68 void smp_schedule_stop_proc_save_ctx(struct proc * p);
  69 /* migrate the full context of a process to the destination CPU */
  70 void smp_schedule_migrate_proc(struct proc * p, unsigned dest_cpu);
  71
  72 void arch_send_smp_schedule_ipi(unsigned cpu);
  73 void arch_smp_halt_cpu(void);
  74
  75 /* deal with x-cpu scheduling event */
  76 void smp_sched_handler(void);
  77
  78 #endif /* __ASSEMBLY__ */
  79
  80 #endif /* CONFIG_SMP */
  81
  82 #endif /* __SMP_H__ */