include/asm-mips/smp.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General
   3  * Public License.  See the file "COPYING" in the main directory of this
   4  * archive for more details.
   5  *
   6  * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
   7  * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
   8  * Copyright (C) 2000, 2001, 2002 Ralf Baechle
   9  * Copyright (C) 2000, 2001 Broadcom Corporation
  10  */
  11 #ifndef __ASM_SMP_H
  12 #define __ASM_SMP_H
  13
  14 #include <linux/config.h>
  15
  16 #ifdef CONFIG_SMP
  17
  18 #include <linux/bitops.h>
  19 #include <linux/linkage.h>
  20 #include <linux/threads.h>
  21 #include <linux/cpumask.h>
  22 #include <asm/atomic.h>
  23
  24 #define smp_processor_id()      (current_thread_info()->cpu)
  25
  26 /* Map from cpu id to sequential logical cpu number.  This will only
  27    not be idempotent when cpus failed to come on-line.  */
  28 extern int __cpu_number_map[NR_CPUS];
  29 #define cpu_number_map(cpu)  __cpu_number_map[cpu]
  30
  31 /* The reverse map from sequential logical cpu number to cpu id.  */
  32 extern int __cpu_logical_map[NR_CPUS];
  33 #define cpu_logical_map(cpu)  __cpu_logical_map[cpu]
  34
  35 #define NO_PROC_ID      (-1)
  36
  37 struct call_data_struct {
  38         void            (*func)(void *);
  39         void            *info;
  40         atomic_t        started;
  41         atomic_t        finished;
  42         int             wait;
  43 };
  44
  45 extern struct call_data_struct *call_data;
  46
  47 #define SMP_RESCHEDULE_YOURSELF 0x1     /* XXX braindead */
  48 #define SMP_CALL_FUNCTION       0x2
  49
  50 extern cpumask_t phys_cpu_present_map;
  51 extern cpumask_t cpu_online_map;
  52 #define cpu_possible_map        phys_cpu_present_map
  53
  54 extern cpumask_t cpu_callout_map;
  55 /* We don't mark CPUs online until __cpu_up(), so we need another measure */
  56 static inline int num_booting_cpus(void)
  57 {
  58         return cpus_weight(cpu_callout_map);
  59 }
  60
  61 /* These are defined by the board-specific code. */
  62
  63 /*
  64  * Cause the function described by call_data to be executed on the passed
  65  * cpu.  When the function has finished, increment the finished field of
  66  * call_data.
  67  */
  68 extern void core_send_ipi(int cpu, unsigned int action);
  69
  70 /*
  71  * Firmware CPU startup hook
  72  */
  73 extern void prom_boot_secondary(int cpu, struct task_struct *idle);
  74
  75 /*
  76  *  After we've done initial boot, this function is called to allow the
  77  *  board code to clean up state, if needed
  78  */
  79 extern void prom_init_secondary(void);
  80
  81 /*
  82  * Detect available CPUs, populate phys_cpu_present_map before smp_init
  83  */
  84 extern void prom_prepare_cpus(unsigned int max_cpus);
  85
  86 /*
  87  * Last chance for the board code to finish SMP initialization before
  88  * the CPU is "online".
  89  */
  90 extern void prom_smp_finish(void);
  91
  92 /* Hook for after all CPUs are online */
  93 extern void prom_cpus_done(void);
  94
  95 extern void asmlinkage smp_bootstrap(void);
  96
  97 /*
  98  * this function sends a 'reschedule' IPI to another CPU.
  99  * it goes straight through and wastes no time serializing
 100  * anything. Worst case is that we lose a reschedule ...
 101  */
 102 static inline void smp_send_reschedule(int cpu)
 103 {
 104         core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF);
 105 }
 106
 107 extern asmlinkage void smp_call_function_interrupt(void);
 108
 109 #endif /* CONFIG_SMP */
 110
 111 #endif /* __ASM_SMP_H */