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
  15 #ifdef CONFIG_SMP
  16
  17 #include <linux/bitops.h>
  18 #include <linux/linkage.h>
  19 #include <linux/threads.h>
  20 #include <linux/cpumask.h>
  21 #include <asm/atomic.h>
  22
  23 #define raw_smp_processor_id() (current_thread_info()->cpu)
  24
  25 /* Map from cpu id to sequential logical cpu number.  This will only
  26    not be idempotent when cpus failed to come on-line.  */
  27 extern int __cpu_number_map[NR_CPUS];
  28 #define cpu_number_map(cpu)  __cpu_number_map[cpu]
  29
  30 /* The reverse map from sequential logical cpu number to cpu id.  */
  31 extern int __cpu_logical_map[NR_CPUS];
  32 #define cpu_logical_map(cpu)  __cpu_logical_map[cpu]
  33
  34 #define NO_PROC_ID      (-1)
  35
  36 struct call_data_struct {
  37         void            (*func)(void *);
  38         void            *info;
  39         atomic_t        started;
  40         atomic_t        finished;
  41         int             wait;
  42 };
  43
  44 extern struct call_data_struct *call_data;
  45
  46 #define SMP_RESCHEDULE_YOURSELF 0x1     /* XXX braindead */
  47 #define SMP_CALL_FUNCTION       0x2
  48
  49 extern cpumask_t phys_cpu_present_map;
  50 #define cpu_possible_map        phys_cpu_present_map
  51
  52 extern cpumask_t cpu_callout_map;
  53 /* We don't mark CPUs online until __cpu_up(), so we need another measure */
  54 static inline int num_booting_cpus(void)
  55 {
  56         return cpus_weight(cpu_callout_map);
  57 }
  58
  59 /*
  60  * These are defined by the board-specific code.
  61  */
  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  * Populate cpu_possible_map before smp_init, called from setup_arch.
  83  */
  84 extern void plat_smp_setup(void);
  85
  86 /*
  87  * Called in smp_prepare_cpus.
  88  */
  89 extern void plat_prepare_cpus(unsigned int max_cpus);
  90
  91 /*
  92  * Last chance for the board code to finish SMP initialization before
  93  * the CPU is "online".
  94  */
  95 extern void prom_smp_finish(void);
  96
  97 /* Hook for after all CPUs are online */
  98 extern void prom_cpus_done(void);
  99
 100 extern void asmlinkage smp_bootstrap(void);
 101
 102 /*
 103  * this function sends a 'reschedule' IPI to another CPU.
 104  * it goes straight through and wastes no time serializing
 105  * anything. Worst case is that we lose a reschedule ...
 106  */
 107 static inline void smp_send_reschedule(int cpu)
 108 {
 109         core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF);
 110 }
 111
 112 extern asmlinkage void smp_call_function_interrupt(void);
 113
 114 #endif /* CONFIG_SMP */
 115
 116 #endif /* __ASM_SMP_H */