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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/smp.h
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/linux/smp.h')
-rw-r--r--include/linux/smp.h139
1 files changed, 139 insertions, 0 deletions
diff --git a/include/linux/smp.h b/include/linux/smp.h
new file mode 100644
index 000000000000..dcf1db3b35d3
--- /dev/null
+++ b/include/linux/smp.h
@@ -0,0 +1,139 @@
+#ifndef __LINUX_SMP_H
+#define __LINUX_SMP_H
+
+/*
+ * Generic SMP support
+ * Alan Cox. <alan@redhat.com>
+ */
+
+#include <linux/config.h>
+
+extern void cpu_idle(void);
+
+#ifdef CONFIG_SMP
+
+#include <linux/preempt.h>
+#include <linux/kernel.h>
+#include <linux/compiler.h>
+#include <linux/thread_info.h>
+#include <asm/smp.h>
+#include <asm/bug.h>
+
+/*
+ * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
+ * (defined in asm header):
+ */
+
+/*
+ * stops all CPUs but the current one:
+ */
+extern void smp_send_stop(void);
+
+/*
+ * sends a 'reschedule' event to another CPU:
+ */
+extern void smp_send_reschedule(int cpu);
+
+
+/*
+ * Prepare machine for booting other CPUs.
+ */
+extern void smp_prepare_cpus(unsigned int max_cpus);
+
+/*
+ * Bring a CPU up
+ */
+extern int __cpu_up(unsigned int cpunum);
+
+/*
+ * Final polishing of CPUs
+ */
+extern void smp_cpus_done(unsigned int max_cpus);
+
+/*
+ * Call a function on all other processors
+ */
+extern int smp_call_function (void (*func) (void *info), void *info,
+ int retry, int wait);
+
+/*
+ * Call a function on all processors
+ */
+static inline int on_each_cpu(void (*func) (void *info), void *info,
+ int retry, int wait)
+{
+ int ret = 0;
+
+ preempt_disable();
+ ret = smp_call_function(func, info, retry, wait);
+ func(info);
+ preempt_enable();
+ return ret;
+}
+
+#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
+#define MSG_ALL 0x8001
+
+#define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
+#define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
+ * when rebooting
+ */
+#define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
+#define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
+
+/*
+ * Mark the boot cpu "online" so that it can call console drivers in
+ * printk() and can access its per-cpu storage.
+ */
+void smp_prepare_boot_cpu(void);
+
+#else /* !SMP */
+
+/*
+ * These macros fold the SMP functionality into a single CPU system
+ */
+
+#if !defined(__smp_processor_id) || !defined(CONFIG_PREEMPT)
+# define smp_processor_id() 0
+#endif
+#define hard_smp_processor_id() 0
+#define smp_call_function(func,info,retry,wait) ({ 0; })
+#define on_each_cpu(func,info,retry,wait) ({ func(info); 0; })
+static inline void smp_send_reschedule(int cpu) { }
+#define num_booting_cpus() 1
+#define smp_prepare_boot_cpu() do {} while (0)
+
+#endif /* !SMP */
+
+/*
+ * DEBUG_PREEMPT support: check whether smp_processor_id() is being
+ * used in a preemption-safe way.
+ *
+ * An architecture has to enable this debugging code explicitly.
+ * It can do so by renaming the smp_processor_id() macro to
+ * __smp_processor_id(). This should only be done after some minimal
+ * testing, because usually there are a number of false positives
+ * that an architecture will trigger.
+ *
+ * To fix a false positive (i.e. smp_processor_id() use that the
+ * debugging code reports but which use for some reason is legal),
+ * change the smp_processor_id() reference to _smp_processor_id(),
+ * which is the nondebug variant. NOTE: don't use this to hack around
+ * real bugs.
+ */
+#ifdef __smp_processor_id
+# if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT)
+ extern unsigned int smp_processor_id(void);
+# else
+# define smp_processor_id() __smp_processor_id()
+# endif
+# define _smp_processor_id() __smp_processor_id()
+#else
+# define _smp_processor_id() smp_processor_id()
+#endif
+
+#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
+#define put_cpu() preempt_enable()
+#define put_cpu_no_resched() preempt_enable_no_resched()
+
+#endif /* __LINUX_SMP_H */