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!

1 files changed, 965 insertions, 0 deletions

diff --git a/arch/m32r/kernel/smp.c b/arch/m32r/kernel/smp.c
new file mode 100644
index 000000000000..48b187f2d2b3
--- /dev/null
+++ b/arch/m32r/kernel/smp.c
@@ -0,0 +1,965 @@
+/*
+ *  linux/arch/m32r/kernel/smp.c
+ *
+ *  M32R SMP support routines.
+ *
+ *  Copyright (c) 2001, 2002  Hitoshi Yamamoto
+ *
+ *  Taken from i386 version.
+ *    (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
+ *    (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com>
+ *
+ *  This code is released under the GNU General Public License version 2 or
+ *  later.
+ */
+
+#undef DEBUG_SMP
+
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/profile.h>
+#include <linux/cpu.h>
+
+#include <asm/cacheflush.h>
+#include <asm/pgalloc.h>
+#include <asm/atomic.h>
+#include <asm/io.h>
+#include <asm/mmu_context.h>
+#include <asm/m32r.h>
+
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+/* Data structures and variables                                             */
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+
+/*
+ * Structure and data for smp_call_function(). This is designed to minimise
+ * static memory requirements. It also looks cleaner.
+ */
+static DEFINE_SPINLOCK(call_lock);
+
+struct call_data_struct {
+        void (*func) (void *info);
+        void *info;
+        atomic_t started;
+        atomic_t finished;
+        int wait;
+} __attribute__ ((__aligned__(SMP_CACHE_BYTES)));
+
+static struct call_data_struct *call_data;
+
+/*
+ * For flush_cache_all()
+ */
+static DEFINE_SPINLOCK(flushcache_lock);
+static volatile unsigned long flushcache_cpumask = 0;
+
+/*
+ * For flush_tlb_others()
+ */
+static volatile cpumask_t flush_cpumask;
+static struct mm_struct *flush_mm;
+static struct vm_area_struct *flush_vma;
+static volatile unsigned long flush_va;
+static DEFINE_SPINLOCK(tlbstate_lock);
+#define FLUSH_ALL 0xffffffff
+
+DECLARE_PER_CPU(int, prof_multiplier);
+DECLARE_PER_CPU(int, prof_old_multiplier);
+DECLARE_PER_CPU(int, prof_counter);
+
+extern spinlock_t ipi_lock[];
+
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+/* Function Prototypes                                                       */
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+
+void smp_send_reschedule(int);
+void smp_reschedule_interrupt(void);
+
+void smp_flush_cache_all(void);
+void smp_flush_cache_all_interrupt(void);
+
+void smp_flush_tlb_all(void);
+static void flush_tlb_all_ipi(void *);
+
+void smp_flush_tlb_mm(struct mm_struct *);
+void smp_flush_tlb_range(struct vm_area_struct *, unsigned long, \
+        unsigned long);
+void smp_flush_tlb_page(struct vm_area_struct *, unsigned long);
+static void flush_tlb_others(cpumask_t, struct mm_struct *,
+        struct vm_area_struct *, unsigned long);
+void smp_invalidate_interrupt(void);
+
+void smp_send_stop(void);
+static void stop_this_cpu(void *);
+
+int smp_call_function(void (*) (void *), void *, int, int);
+void smp_call_function_interrupt(void);
+
+void smp_send_timer(void);
+void smp_ipi_timer_interrupt(struct pt_regs *);
+void smp_local_timer_interrupt(struct pt_regs *);
+
+void send_IPI_allbutself(int, int);
+static void send_IPI_mask(cpumask_t, int, int);
+unsigned long send_IPI_mask_phys(cpumask_t, int, int);
+
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+/* Rescheduling request Routines                                             */
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+
+/*==========================================================================*
+ * Name:         smp_send_reschedule
+ *
+ * Description:  This routine requests other CPU to execute rescheduling.
+ *               1.Send 'RESCHEDULE_IPI' to other CPU.
+ *                 Request other CPU to execute 'smp_reschedule_interrupt()'.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    cpu_id - Target CPU ID
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_send_reschedule(int cpu_id)
+{
+        WARN_ON(cpu_is_offline(cpu_id));
+        send_IPI_mask(cpumask_of_cpu(cpu_id), RESCHEDULE_IPI, 1);
+}
+
+/*==========================================================================*
+ * Name:         smp_reschedule_interrupt
+ *
+ * Description:  This routine executes on CPU which received
+ *               'RESCHEDULE_IPI'.
+ *               Rescheduling is processed at the exit of interrupt
+ *               operation.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    NONE
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_reschedule_interrupt(void)
+{
+        /* nothing to do */
+}
+
+/*==========================================================================*
+ * Name:         smp_flush_cache_all
+ *
+ * Description:  This routine sends a 'INVALIDATE_CACHE_IPI' to all other
+ *               CPUs in the system.
+ *
+ * Born on Date: 2003-05-28
+ *
+ * Arguments:    NONE
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_flush_cache_all(void)
+{
+        cpumask_t cpumask;
+        unsigned long *mask;
+
+        preempt_disable();
+        cpumask = cpu_online_map;
+        cpu_clear(smp_processor_id(), cpumask);
+        spin_lock(&flushcache_lock);
+        mask=cpus_addr(cpumask);
+        atomic_set_mask(*mask, (atomic_t *)&flushcache_cpumask);
+        send_IPI_mask(cpumask, INVALIDATE_CACHE_IPI, 0);
+        _flush_cache_copyback_all();
+        while (flushcache_cpumask)
+                mb();
+        spin_unlock(&flushcache_lock);
+        preempt_enable();
+}
+
+void smp_flush_cache_all_interrupt(void)
+{
+        _flush_cache_copyback_all();
+        clear_bit(smp_processor_id(), &flushcache_cpumask);
+}
+
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+/* TLB flush request Routins                                                 */
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+
+/*==========================================================================*
+ * Name:         smp_flush_tlb_all
+ *
+ * Description:  This routine flushes all processes TLBs.
+ *               1.Request other CPU to execute 'flush_tlb_all_ipi()'.
+ *               2.Execute 'do_flush_tlb_all_local()'.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    NONE
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_flush_tlb_all(void)
+{
+        unsigned long flags;
+
+        preempt_disable();
+        local_irq_save(flags);
+        __flush_tlb_all();
+        local_irq_restore(flags);
+        smp_call_function(flush_tlb_all_ipi, 0, 1, 1);
+        preempt_enable();
+}
+
+/*==========================================================================*
+ * Name:         flush_tlb_all_ipi
+ *
+ * Description:  This routine flushes all local TLBs.
+ *               1.Execute 'do_flush_tlb_all_local()'.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    *info - not used
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+static void flush_tlb_all_ipi(void *info)
+{
+        __flush_tlb_all();
+}
+
+/*==========================================================================*
+ * Name:         smp_flush_tlb_mm
+ *
+ * Description:  This routine flushes the specified mm context TLB's.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    *mm - a pointer to the mm struct for flush TLB
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_flush_tlb_mm(struct mm_struct *mm)
+{
+        int cpu_id = smp_processor_id();
+        cpumask_t cpu_mask;
+        unsigned long *mmc = &mm->context[cpu_id];
+        unsigned long flags;
+
+        preempt_disable();
+        cpu_mask = mm->cpu_vm_mask;
+        cpu_clear(cpu_id, cpu_mask);
+
+        if (*mmc != NO_CONTEXT) {
+                local_irq_save(flags);
+                *mmc = NO_CONTEXT;
+                if (mm == current->mm)
+                        activate_context(mm);
+                else
+                        cpu_clear(cpu_id, mm->cpu_vm_mask);
+                local_irq_restore(flags);
+        }
+        if (!cpus_empty(cpu_mask))
+                flush_tlb_others(cpu_mask, mm, NULL, FLUSH_ALL);
+
+        preempt_enable();
+}
+
+/*==========================================================================*
+ * Name:         smp_flush_tlb_range
+ *
+ * Description:  This routine flushes a range of pages.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    *mm - a pointer to the mm struct for flush TLB
+ *               start - not used
+ *               end - not used
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+        unsigned long end)
+{
+        smp_flush_tlb_mm(vma->vm_mm);
+}
+
+/*==========================================================================*
+ * Name:         smp_flush_tlb_page
+ *
+ * Description:  This routine flushes one page.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    *vma - a pointer to the vma struct include va
+ *               va - virtual address for flush TLB
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
+{
+        struct mm_struct *mm = vma->vm_mm;
+        int cpu_id = smp_processor_id();
+        cpumask_t cpu_mask;
+        unsigned long *mmc = &mm->context[cpu_id];
+        unsigned long flags;
+
+        preempt_disable();
+        cpu_mask = mm->cpu_vm_mask;
+        cpu_clear(cpu_id, cpu_mask);
+
+#ifdef DEBUG_SMP
+        if (!mm)
+                BUG();
+#endif
+
+        if (*mmc != NO_CONTEXT) {
+                local_irq_save(flags);
+                va &= PAGE_MASK;
+                va |= (*mmc & MMU_CONTEXT_ASID_MASK);
+                __flush_tlb_page(va);
+                local_irq_restore(flags);
+        }
+        if (!cpus_empty(cpu_mask))
+                flush_tlb_others(cpu_mask, mm, vma, va);
+
+        preempt_enable();
+}
+
+/*==========================================================================*
+ * Name:         flush_tlb_others
+ *
+ * Description:  This routine requests other CPU to execute flush TLB.
+ *               1.Setup parmeters.
+ *               2.Send 'INVALIDATE_TLB_IPI' to other CPU.
+ *                 Request other CPU to execute 'smp_invalidate_interrupt()'.
+ *               3.Wait for other CPUs operation finished.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    cpumask - bitmap of target CPUs
+ *               *mm -  a pointer to the mm struct for flush TLB
+ *               *vma -  a pointer to the vma struct include va
+ *               va - virtual address for flush TLB
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
+        struct vm_area_struct *vma, unsigned long va)
+{
+        unsigned long *mask;
+#ifdef DEBUG_SMP
+        unsigned long flags;
+        __save_flags(flags);
+        if (!(flags & 0x0040))  /* Interrupt Disable NONONO */
+                BUG();
+#endif /* DEBUG_SMP */
+
+        /*
+         * A couple of (to be removed) sanity checks:
+         *
+         * - we do not send IPIs to not-yet booted CPUs.
+         * - current CPU must not be in mask
+         * - mask must exist :)
+         */
+        BUG_ON(cpus_empty(cpumask));
+
+        BUG_ON(cpu_isset(smp_processor_id(), cpumask));
+        BUG_ON(!mm);
+
+        /* If a CPU which we ran on has gone down, OK. */
+        cpus_and(cpumask, cpumask, cpu_online_map);
+        if (cpus_empty(cpumask))
+                return;
+
+        /*
+         * i'm not happy about this global shared spinlock in the
+         * MM hot path, but we'll see how contended it is.
+         * Temporarily this turns IRQs off, so that lockups are
+         * detected by the NMI watchdog.
+         */
+        spin_lock(&tlbstate_lock);
+
+        flush_mm = mm;
+        flush_vma = vma;
+        flush_va = va;
+        mask=cpus_addr(cpumask);
+        atomic_set_mask(*mask, (atomic_t *)&flush_cpumask);
+
+        /*
+         * We have to send the IPI only to
+         * CPUs affected.
+         */
+        send_IPI_mask(cpumask, INVALIDATE_TLB_IPI, 0);
+
+        while (!cpus_empty(flush_cpumask)) {
+                /* nothing. lockup detection does not belong here */
+                mb();
+        }
+
+        flush_mm = NULL;
+        flush_vma = NULL;
+        flush_va = 0;
+        spin_unlock(&tlbstate_lock);
+}
+
+/*==========================================================================*
+ * Name:         smp_invalidate_interrupt
+ *
+ * Description:  This routine executes on CPU which received
+ *               'INVALIDATE_TLB_IPI'.
+ *               1.Flush local TLB.
+ *               2.Report flush TLB process was finished.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    NONE
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_invalidate_interrupt(void)
+{
+        int cpu_id = smp_processor_id();
+        unsigned long *mmc = &flush_mm->context[cpu_id];
+
+        if (!cpu_isset(cpu_id, flush_cpumask))
+                return;
+
+        if (flush_va == FLUSH_ALL) {
+                *mmc = NO_CONTEXT;
+                if (flush_mm == current->active_mm)
+                        activate_context(flush_mm);
+                else
+                        cpu_clear(cpu_id, flush_mm->cpu_vm_mask);
+        } else {
+                unsigned long va = flush_va;
+
+                if (*mmc != NO_CONTEXT) {
+                        va &= PAGE_MASK;
+                        va |= (*mmc & MMU_CONTEXT_ASID_MASK);
+                        __flush_tlb_page(va);
+                }
+        }
+        cpu_clear(cpu_id, flush_cpumask);
+}
+
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+/* Stop CPU request Routins                                                 */
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+
+/*==========================================================================*
+ * Name:         smp_send_stop
+ *
+ * Description:  This routine requests stop all CPUs.
+ *               1.Request other CPU to execute 'stop_this_cpu()'.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    NONE
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_send_stop(void)
+{
+        smp_call_function(stop_this_cpu, NULL, 1, 0);
+}
+
+/*==========================================================================*
+ * Name:         stop_this_cpu
+ *
+ * Description:  This routine halt CPU.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    NONE
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+static void stop_this_cpu(void *dummy)
+{
+        int cpu_id = smp_processor_id();
+
+        /*
+         * Remove this CPU:
+         */
+        cpu_clear(cpu_id, cpu_online_map);
+
+        /*
+         * PSW IE = 1;
+         * IMASK = 0;
+         * goto SLEEP
+         */
+        local_irq_disable();
+        outl(0, M32R_ICU_IMASK_PORTL);
+        inl(M32R_ICU_IMASK_PORTL);      /* dummy read */
+        local_irq_enable();
+
+        for ( ; ; );
+}
+
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+/* Call function Routins                                                     */
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+
+/*==========================================================================*
+ * Name:         smp_call_function
+ *
+ * Description:  This routine sends a 'CALL_FUNCTION_IPI' to all other CPUs
+ *               in the system.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    *func - The function to run. This must be fast and
+ *                       non-blocking.
+ *               *info - An arbitrary pointer to pass to the function.
+ *               nonatomic - currently unused.
+ *               wait - If true, wait (atomically) until function has
+ *                      completed on other CPUs.
+ *
+ * Returns:      0 on success, else a negative status code. Does not return
+ *               until remote CPUs are nearly ready to execute <<func>> or
+ *               are or have executed.
+ *
+ * Cautions:     You must not call this function with disabled interrupts or
+ *               from a hardware interrupt handler, you may call it from a
+ *               bottom half handler.
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
+        int wait)
+{
+        struct call_data_struct data;
+        int cpus;
+
+#ifdef DEBUG_SMP
+        unsigned long flags;
+        __save_flags(flags);
+        if (!(flags & 0x0040))  /* Interrupt Disable NONONO */
+                BUG();
+#endif /* DEBUG_SMP */
+
+        /* Holding any lock stops cpus from going down. */
+        spin_lock(&call_lock);
+        cpus = num_online_cpus() - 1;
+
+        if (!cpus) {
+                spin_unlock(&call_lock);
+                return 0;
+        }
+
+        /* Can deadlock when called with interrupts disabled */
+        WARN_ON(irqs_disabled());
+
+        data.func = func;
+        data.info = info;
+        atomic_set(&data.started, 0);
+        data.wait = wait;
+        if (wait)
+                atomic_set(&data.finished, 0);
+
+        call_data = &data;
+        mb();
+
+        /* Send a message to all other CPUs and wait for them to respond */
+        send_IPI_allbutself(CALL_FUNCTION_IPI, 0);
+
+        /* Wait for response */
+        while (atomic_read(&data.started) != cpus)
+                barrier();
+
+        if (wait)
+                while (atomic_read(&data.finished) != cpus)
+                        barrier();
+        spin_unlock(&call_lock);
+
+        return 0;
+}
+
+/*==========================================================================*
+ * Name:         smp_call_function_interrupt
+ *
+ * Description:  This routine executes on CPU which received
+ *               'CALL_FUNCTION_IPI'.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    NONE
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_call_function_interrupt(void)
+{
+        void (*func) (void *info) = call_data->func;
+        void *info = call_data->info;
+        int wait = call_data->wait;
+
+        /*
+         * Notify initiating CPU that I've grabbed the data and am
+         * about to execute the function
+         */
+        mb();
+        atomic_inc(&call_data->started);
+        /*
+         * At this point the info structure may be out of scope unless wait==1
+         */
+        irq_enter();
+        (*func)(info);
+        irq_exit();
+
+        if (wait) {
+                mb();
+                atomic_inc(&call_data->finished);
+        }
+}
+
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+/* Timer Routins                                                             */
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+
+/*==========================================================================*
+ * Name:         smp_send_timer
+ *
+ * Description:  This routine sends a 'LOCAL_TIMER_IPI' to all other CPUs
+ *               in the system.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    NONE
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_send_timer(void)
+{
+        send_IPI_allbutself(LOCAL_TIMER_IPI, 1);
+}
+
+/*==========================================================================*
+ * Name:         smp_send_timer
+ *
+ * Description:  This routine executes on CPU which received
+ *               'LOCAL_TIMER_IPI'.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    *regs - a pointer to the saved regster info
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void smp_ipi_timer_interrupt(struct pt_regs *regs)
+{
+        irq_enter();
+        smp_local_timer_interrupt(regs);
+        irq_exit();
+}
+
+/*==========================================================================*
+ * Name:         smp_local_timer_interrupt
+ *
+ * Description:  Local timer interrupt handler. It does both profiling and
+ *               process statistics/rescheduling.
+ *               We do profiling in every local tick, statistics/rescheduling
+ *               happen only every 'profiling multiplier' ticks. The default
+ *               multiplier is 1 and it can be changed by writing the new
+ *               multiplier value into /proc/profile.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    *regs - a pointer to the saved regster info
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Original:     arch/i386/kernel/apic.c
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ * 2003-06-24 hy  use per_cpu structure.
+ *==========================================================================*/
+void smp_local_timer_interrupt(struct pt_regs *regs)
+{
+        int user = user_mode(regs);
+        int cpu_id = smp_processor_id();
+
+        /*
+         * The profiling function is SMP safe. (nothing can mess
+         * around with "current", and the profiling counters are
+         * updated with atomic operations). This is especially
+         * useful with a profiling multiplier != 1
+         */
+
+        profile_tick(CPU_PROFILING, regs);
+
+        if (--per_cpu(prof_counter, cpu_id) <= 0) {
+                /*
+                 * The multiplier may have changed since the last time we got
+                 * to this point as a result of the user writing to
+                 * /proc/profile. In this case we need to adjust the APIC
+                 * timer accordingly.
+                 *
+                 * Interrupts are already masked off at this point.
+                 */
+                per_cpu(prof_counter, cpu_id)
+                        = per_cpu(prof_multiplier, cpu_id);
+                if (per_cpu(prof_counter, cpu_id)
+                        != per_cpu(prof_old_multiplier, cpu_id))
+                {
+                        per_cpu(prof_old_multiplier, cpu_id)
+                                = per_cpu(prof_counter, cpu_id);
+                }
+
+                update_process_times(user);
+        }
+}
+
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+/* Send IPI Routins                                                          */
+/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
+
+/*==========================================================================*
+ * Name:         send_IPI_allbutself
+ *
+ * Description:  This routine sends a IPI to all other CPUs in the system.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    ipi_num - Number of IPI
+ *               try -  0 : Send IPI certainly.
+ *                     !0 : The following IPI is not sended when Target CPU
+ *                          has not received the before IPI.
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+void send_IPI_allbutself(int ipi_num, int try)
+{
+        cpumask_t cpumask;
+
+        cpumask = cpu_online_map;
+        cpu_clear(smp_processor_id(), cpumask);
+
+        send_IPI_mask(cpumask, ipi_num, try);
+}
+
+/*==========================================================================*
+ * Name:         send_IPI_mask
+ *
+ * Description:  This routine sends a IPI to CPUs in the system.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    cpu_mask - Bitmap of target CPUs logical ID
+ *               ipi_num - Number of IPI
+ *               try -  0 : Send IPI certainly.
+ *                     !0 : The following IPI is not sended when Target CPU
+ *                          has not received the before IPI.
+ *
+ * Returns:      void (cannot fail)
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+static void send_IPI_mask(cpumask_t cpumask, int ipi_num, int try)
+{
+        cpumask_t physid_mask, tmp;
+        int cpu_id, phys_id;
+        int num_cpus = num_online_cpus();
+
+        if (num_cpus <= 1)      /* NO MP */
+                return;
+
+        cpus_and(tmp, cpumask, cpu_online_map);
+        BUG_ON(!cpus_equal(cpumask, tmp));
+
+        physid_mask = CPU_MASK_NONE;
+        for_each_cpu_mask(cpu_id, cpumask){
+                if ((phys_id = cpu_to_physid(cpu_id)) != -1)
+                        cpu_set(phys_id, physid_mask);
+        }
+
+        send_IPI_mask_phys(physid_mask, ipi_num, try);
+}
+
+/*==========================================================================*
+ * Name:         send_IPI_mask_phys
+ *
+ * Description:  This routine sends a IPI to other CPUs in the system.
+ *
+ * Born on Date: 2002.02.05
+ *
+ * Arguments:    cpu_mask - Bitmap of target CPUs physical ID
+ *               ipi_num - Number of IPI
+ *               try -  0 : Send IPI certainly.
+ *                     !0 : The following IPI is not sended when Target CPU
+ *                          has not received the before IPI.
+ *
+ * Returns:      IPICRi regster value.
+ *
+ * Modification log:
+ * Date       Who Description
+ * ---------- --- --------------------------------------------------------
+ *
+ *==========================================================================*/
+unsigned long send_IPI_mask_phys(cpumask_t physid_mask, int ipi_num,
+        int try)
+{
+        spinlock_t *ipilock;
+        unsigned long flags = 0;
+        volatile unsigned long *ipicr_addr;
+        unsigned long ipicr_val;
+        unsigned long my_physid_mask;
+        unsigned long mask = cpus_addr(physid_mask)[0];
+
+
+        if (mask & ~physids_coerce(phys_cpu_present_map))
+                BUG();
+        if (ipi_num >= NR_IPIS)
+                BUG();
+
+        mask <<= IPI_SHIFT;
+        ipilock = &ipi_lock[ipi_num];
+        ipicr_addr = (volatile unsigned long *)(M32R_ICU_IPICR_ADDR
+                + (ipi_num << 2));
+        my_physid_mask = ~(1 << smp_processor_id());
+
+        /*
+         * lock ipi_lock[i]
+         * check IPICRi == 0
+         * write IPICRi (send IPIi)
+         * unlock ipi_lock[i]
+         */
+        __asm__ __volatile__ (
+                ";; LOCK ipi_lock[i]            \n\t"
+                ".fillinsn                      \n"
+                "1:                             \n\t"
+                "mvfc   %1, psw                 \n\t"
+                "clrpsw #0x40 -> nop            \n\t"
+                DCACHE_CLEAR("r4", "r5", "%2")
+                "lock   r4, @%2                 \n\t"
+                "addi   r4, #-1                 \n\t"
+                "unlock r4, @%2                 \n\t"
+                "mvtc   %1, psw                 \n\t"
+                "bnez   r4, 2f                  \n\t"
+                LOCK_SECTION_START(".balign 4 \n\t")
+                ".fillinsn                      \n"
+                "2:                             \n\t"
+                "ld     r4, @%2                 \n\t"
+                "blez   r4, 2b                  \n\t"
+                "bra    1b                      \n\t"
+                LOCK_SECTION_END
+                ";; CHECK IPICRi == 0           \n\t"
+                ".fillinsn                      \n"
+                "3:                             \n\t"
+                "ld     %0, @%3                 \n\t"
+                "and    %0, %6                  \n\t"
+                "beqz   %0, 4f                  \n\t"
+                "bnez   %5, 5f                  \n\t"
+                "bra    3b                      \n\t"
+                ";; WRITE IPICRi (send IPIi)    \n\t"
+                ".fillinsn                      \n"
+                "4:                             \n\t"
+                "st     %4, @%3                 \n\t"
+                ";; UNLOCK ipi_lock[i]          \n\t"
+                ".fillinsn                      \n"
+                "5:                             \n\t"
+                "ldi    r4, #1                  \n\t"
+                "st     r4, @%2                 \n\t"
+                : "=&r"(ipicr_val)
+                : "r"(flags), "r"(&ipilock->slock), "r"(ipicr_addr),
+                  "r"(mask), "r"(try), "r"(my_physid_mask)
+                : "memory", "r4"
+#ifdef CONFIG_CHIP_M32700_TS1
+                , "r5"
+#endif  /* CONFIG_CHIP_M32700_TS1 */
+        );
+
+        return ipicr_val;
+}