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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef __LINUX_SMP_H |
| 2 | #define __LINUX_SMP_H |
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| 3 | |||
| 4 | /* |
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| 5 | * Generic SMP support |
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| 6 | * Alan Cox. <alan@redhat.com> |
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| 7 | */ |
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| 8 | |||
| 9 | #include <linux/config.h> |
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| 10 | |||
| 11 | #ifdef CONFIG_SMP |
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| 12 | |||
| 13 | #include <linux/preempt.h> |
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| 14 | #include <linux/kernel.h> |
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| 15 | #include <linux/compiler.h> |
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| 16 | #include <linux/thread_info.h> |
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| 17 | #include <asm/smp.h> |
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| 18 | #include <asm/bug.h> |
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| 19 | |||
| 20 | /* |
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| 21 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. |
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| 22 | * (defined in asm header): |
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| 23 | */ |
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| 24 | |||
| 25 | /* |
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| 26 | * stops all CPUs but the current one: |
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| 27 | */ |
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| 28 | extern void smp_send_stop(void); |
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| 29 | |||
| 30 | /* |
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| 31 | * sends a 'reschedule' event to another CPU: |
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| 32 | */ |
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| 33 | extern void FASTCALL(smp_send_reschedule(int cpu)); |
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| 34 | |||
| 35 | |||
| 36 | /* |
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| 37 | * Prepare machine for booting other CPUs. |
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| 38 | */ |
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| 39 | extern void smp_prepare_cpus(unsigned int max_cpus); |
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| 40 | |||
| 41 | /* |
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| 42 | * Bring a CPU up |
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| 43 | */ |
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| 44 | extern int __cpu_up(unsigned int cpunum); |
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| 45 | |||
| 46 | /* |
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| 47 | * Final polishing of CPUs |
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| 48 | */ |
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| 49 | extern void smp_cpus_done(unsigned int max_cpus); |
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| 50 | |||
| 51 | /* |
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| 52 | * Call a function on all other processors |
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| 53 | */ |
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| 54 | extern int smp_call_function (void (*func) (void *info), void *info, |
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| 55 | int retry, int wait); |
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| 56 | |||
| 57 | /* |
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| 58 | * Call a function on all processors |
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| 59 | */ |
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| 60 | static inline int on_each_cpu(void (*func) (void *info), void *info, |
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| 61 | int retry, int wait) |
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| 62 | { |
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| 63 | int ret = 0; |
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| 64 | |||
| 65 | preempt_disable(); |
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| 66 | ret = smp_call_function(func, info, retry, wait); |
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| 67 | func(info); |
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| 68 | preempt_enable(); |
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| 69 | return ret; |
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| 70 | } |
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| 71 | |||
| 72 | /* |
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| 73 | * True once the per process idle is forked |
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| 74 | */ |
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| 75 | extern int smp_threads_ready; |
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| 76 | |||
| 77 | #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ |
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| 78 | #define MSG_ALL 0x8001 |
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| 79 | |||
| 80 | #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ |
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| 81 | #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's |
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| 82 | * when rebooting |
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| 83 | */ |
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| 84 | #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ |
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| 85 | #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ |
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| 86 | |||
| 87 | /* |
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| 88 | * Mark the boot cpu "online" so that it can call console drivers in |
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| 89 | * printk() and can access its per-cpu storage. |
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| 90 | */ |
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| 91 | void smp_prepare_boot_cpu(void); |
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| 92 | |||
| 93 | #else /* !SMP */ |
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| 94 | |||
| 95 | /* |
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| 96 | * These macros fold the SMP functionality into a single CPU system |
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| 97 | */ |
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| 98 | |||
| 99 | #define smp_processor_id() 0 |
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| 100 | #define hard_smp_processor_id() 0 |
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| 101 | #define smp_threads_ready 1 |
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| 102 | #define smp_call_function(func,info,retry,wait) ({ 0; }) |
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| 103 | #define on_each_cpu(func,info,retry,wait) ({ func(info); 0; }) |
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| 104 | static inline void smp_send_reschedule(int cpu) { } |
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| 105 | #define num_booting_cpus() 1 |
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| 106 | #define cpu_possible(cpu) ({ BUG_ON((cpu) != 0); 1; }) |
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| 107 | #define smp_prepare_boot_cpu() do {} while (0) |
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| 108 | |||
| 109 | #endif /* !SMP */ |
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| 110 | |||
| 111 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) |
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| 112 | #define put_cpu() preempt_enable() |
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| 113 | #define put_cpu_no_resched() preempt_enable_no_resched() |
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| 114 | |||
| 115 | #endif /* __LINUX_SMP_H */ |