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 */