1 files changed, 289 insertions, 0 deletions

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
new file mode 100644
index 000000000000..d99e7aeb7d33
--- /dev/null
+++ b/include/linux/interrupt.h
@@ -0,0 +1,289 @@
+/* interrupt.h */
+#ifndef _LINUX_INTERRUPT_H
+#define _LINUX_INTERRUPT_H
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/bitops.h>
+#include <linux/preempt.h>
+#include <linux/cpumask.h>
+#include <linux/hardirq.h>
+#include <asm/atomic.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+
+/*
+ * For 2.4.x compatibility, 2.4.x can use
+ *
+ *      typedef void irqreturn_t;
+ *      #define IRQ_NONE
+ *      #define IRQ_HANDLED
+ *      #define IRQ_RETVAL(x)
+ *
+ * To mix old-style and new-style irq handler returns.
+ *
+ * IRQ_NONE means we didn't handle it.
+ * IRQ_HANDLED means that we did have a valid interrupt and handled it.
+ * IRQ_RETVAL(x) selects on the two depending on x being non-zero (for handled)
+ */
+typedef int irqreturn_t;
+
+#define IRQ_NONE        (0)
+#define IRQ_HANDLED     (1)
+#define IRQ_RETVAL(x)   ((x) != 0)
+
+struct irqaction {
+        irqreturn_t (*handler)(int, void *, struct pt_regs *);
+        unsigned long flags;
+        cpumask_t mask;
+        const char *name;
+        void *dev_id;
+        struct irqaction *next;
+        int irq;
+        struct proc_dir_entry *dir;
+};
+
+extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs);
+extern int request_irq(unsigned int,
+                       irqreturn_t (*handler)(int, void *, struct pt_regs *),
+                       unsigned long, const char *, void *);
+extern void free_irq(unsigned int, void *);
+
+
+#ifdef CONFIG_GENERIC_HARDIRQS
+extern void disable_irq_nosync(unsigned int irq);
+extern void disable_irq(unsigned int irq);
+extern void enable_irq(unsigned int irq);
+#endif
+
+/*
+ * Temporary defines for UP kernels, until all code gets fixed.
+ */
+#ifndef CONFIG_SMP
+static inline void __deprecated cli(void)
+{
+        local_irq_disable();
+}
+static inline void __deprecated sti(void)
+{
+        local_irq_enable();
+}
+static inline void __deprecated save_flags(unsigned long *x)
+{
+        local_save_flags(*x);
+}
+#define save_flags(x) save_flags(&x);
+static inline void __deprecated restore_flags(unsigned long x)
+{
+        local_irq_restore(x);
+}
+
+static inline void __deprecated save_and_cli(unsigned long *x)
+{
+        local_irq_save(*x);
+}
+#define save_and_cli(x) save_and_cli(&x)
+#endif /* CONFIG_SMP */
+
+/* SoftIRQ primitives.  */
+#define local_bh_disable() \
+                do { add_preempt_count(SOFTIRQ_OFFSET); barrier(); } while (0)
+#define __local_bh_enable() \
+                do { barrier(); sub_preempt_count(SOFTIRQ_OFFSET); } while (0)
+
+extern void local_bh_enable(void);
+
+/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
+   frequency threaded job scheduling. For almost all the purposes
+   tasklets are more than enough. F.e. all serial device BHs et
+   al. should be converted to tasklets, not to softirqs.
+ */
+
+enum
+{
+        HI_SOFTIRQ=0,
+        TIMER_SOFTIRQ,
+        NET_TX_SOFTIRQ,
+        NET_RX_SOFTIRQ,
+        SCSI_SOFTIRQ,
+        TASKLET_SOFTIRQ
+};
+
+/* softirq mask and active fields moved to irq_cpustat_t in
+ * asm/hardirq.h to get better cache usage.  KAO
+ */
+
+struct softirq_action
+{
+        void    (*action)(struct softirq_action *);
+        void    *data;
+};
+
+asmlinkage void do_softirq(void);
+extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
+extern void softirq_init(void);
+#define __raise_softirq_irqoff(nr) do { local_softirq_pending() |= 1UL << (nr); } while (0)
+extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
+extern void FASTCALL(raise_softirq(unsigned int nr));
+
+
+/* Tasklets --- multithreaded analogue of BHs.
+
+   Main feature differing them of generic softirqs: tasklet
+   is running only on one CPU simultaneously.
+
+   Main feature differing them of BHs: different tasklets
+   may be run simultaneously on different CPUs.
+
+   Properties:
+   * If tasklet_schedule() is called, then tasklet is guaranteed
+     to be executed on some cpu at least once after this.
+   * If the tasklet is already scheduled, but its excecution is still not
+     started, it will be executed only once.
+   * If this tasklet is already running on another CPU (or schedule is called
+     from tasklet itself), it is rescheduled for later.
+   * Tasklet is strictly serialized wrt itself, but not
+     wrt another tasklets. If client needs some intertask synchronization,
+     he makes it with spinlocks.
+ */
+
+struct tasklet_struct
+{
+        struct tasklet_struct *next;
+        unsigned long state;
+        atomic_t count;
+        void (*func)(unsigned long);
+        unsigned long data;
+};
+
+#define DECLARE_TASKLET(name, func, data) \
+struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
+
+#define DECLARE_TASKLET_DISABLED(name, func, data) \
+struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
+
+
+enum
+{
+        TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
+        TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
+};
+
+#ifdef CONFIG_SMP
+static inline int tasklet_trylock(struct tasklet_struct *t)
+{
+        return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
+}
+
+static inline void tasklet_unlock(struct tasklet_struct *t)
+{
+        smp_mb__before_clear_bit(); 
+        clear_bit(TASKLET_STATE_RUN, &(t)->state);
+}
+
+static inline void tasklet_unlock_wait(struct tasklet_struct *t)
+{
+        while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
+}
+#else
+#define tasklet_trylock(t) 1
+#define tasklet_unlock_wait(t) do { } while (0)
+#define tasklet_unlock(t) do { } while (0)
+#endif
+
+extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
+
+static inline void tasklet_schedule(struct tasklet_struct *t)
+{
+        if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
+                __tasklet_schedule(t);
+}
+
+extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
+
+static inline void tasklet_hi_schedule(struct tasklet_struct *t)
+{
+        if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
+                __tasklet_hi_schedule(t);
+}
+
+
+static inline void tasklet_disable_nosync(struct tasklet_struct *t)
+{
+        atomic_inc(&t->count);
+        smp_mb__after_atomic_inc();
+}
+
+static inline void tasklet_disable(struct tasklet_struct *t)
+{
+        tasklet_disable_nosync(t);
+        tasklet_unlock_wait(t);
+        smp_mb();
+}
+
+static inline void tasklet_enable(struct tasklet_struct *t)
+{
+        smp_mb__before_atomic_dec();
+        atomic_dec(&t->count);
+}
+
+static inline void tasklet_hi_enable(struct tasklet_struct *t)
+{
+        smp_mb__before_atomic_dec();
+        atomic_dec(&t->count);
+}
+
+extern void tasklet_kill(struct tasklet_struct *t);
+extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
+extern void tasklet_init(struct tasklet_struct *t,
+                         void (*func)(unsigned long), unsigned long data);
+
+/*
+ * Autoprobing for irqs:
+ *
+ * probe_irq_on() and probe_irq_off() provide robust primitives
+ * for accurate IRQ probing during kernel initialization.  They are
+ * reasonably simple to use, are not "fooled" by spurious interrupts,
+ * and, unlike other attempts at IRQ probing, they do not get hung on
+ * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
+ *
+ * For reasonably foolproof probing, use them as follows:
+ *
+ * 1. clear and/or mask the device's internal interrupt.
+ * 2. sti();
+ * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
+ * 4. enable the device and cause it to trigger an interrupt.
+ * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
+ * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
+ * 7. service the device to clear its pending interrupt.
+ * 8. loop again if paranoia is required.
+ *
+ * probe_irq_on() returns a mask of allocated irq's.
+ *
+ * probe_irq_off() takes the mask as a parameter,
+ * and returns the irq number which occurred,
+ * or zero if none occurred, or a negative irq number
+ * if more than one irq occurred.
+ */
+
+#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) 
+static inline unsigned long probe_irq_on(void)
+{
+        return 0;
+}
+static inline int probe_irq_off(unsigned long val)
+{
+        return 0;
+}
+static inline unsigned int probe_irq_mask(unsigned long val)
+{
+        return 0;
+}
+#else
+extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
+extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
+extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
+#endif
+
+#endif