1 files changed, 113 insertions, 0 deletions

diff --git a/include/asm-x86_64/ipi.h b/include/asm-x86_64/ipi.h
new file mode 100644
index 000000000000..d1841847ed89
--- /dev/null
+++ b/include/asm-x86_64/ipi.h
@@ -0,0 +1,113 @@
+#ifndef __ASM_IPI_H
+#define __ASM_IPI_H
+
+/*
+ * Copyright 2004 James Cleverdon, IBM.
+ * Subject to the GNU Public License, v.2
+ *
+ * Generic APIC InterProcessor Interrupt code.
+ *
+ * Moved to include file by James Cleverdon from
+ * arch/x86-64/kernel/smp.c
+ *
+ * Copyrights from kernel/smp.c:
+ *
+ * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
+ * (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com>
+ * (c) 2002,2003 Andi Kleen, SuSE Labs.
+ * Subject to the GNU Public License, v.2
+ */
+
+#include <asm/fixmap.h>
+#include <asm/hw_irq.h>
+#include <asm/apicdef.h>
+#include <asm/genapic.h>
+
+/*
+ * the following functions deal with sending IPIs between CPUs.
+ *
+ * We use 'broadcast', CPU->CPU IPIs and self-IPIs too.
+ */
+
+static inline unsigned int __prepare_ICR (unsigned int shortcut, int vector, unsigned int dest)
+{
+        unsigned int icr =  APIC_DM_FIXED | shortcut | vector | dest;
+        if (vector == KDB_VECTOR)
+                icr = (icr & (~APIC_VECTOR_MASK)) | APIC_DM_NMI;
+        return icr;
+}
+
+static inline int __prepare_ICR2 (unsigned int mask)
+{
+        return SET_APIC_DEST_FIELD(mask);
+}
+
+static inline void __send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int dest)
+{
+        /*
+         * Subtle. In the case of the 'never do double writes' workaround
+         * we have to lock out interrupts to be safe.  As we don't care
+         * of the value read we use an atomic rmw access to avoid costly
+         * cli/sti.  Otherwise we use an even cheaper single atomic write
+         * to the APIC.
+         */
+        unsigned int cfg;
+
+        /*
+         * Wait for idle.
+         */
+        apic_wait_icr_idle();
+
+        /*
+         * No need to touch the target chip field
+         */
+        cfg = __prepare_ICR(shortcut, vector, dest);
+
+        /*
+         * Send the IPI. The write to APIC_ICR fires this off.
+         */
+        apic_write_around(APIC_ICR, cfg);
+}
+
+
+static inline void send_IPI_mask_sequence(cpumask_t mask, int vector)
+{
+        unsigned long cfg, flags;
+        unsigned long query_cpu;
+
+        /*
+         * Hack. The clustered APIC addressing mode doesn't allow us to send
+         * to an arbitrary mask, so I do a unicast to each CPU instead.
+         * - mbligh
+         */
+        local_irq_save(flags);
+
+        for (query_cpu = 0; query_cpu < NR_CPUS; ++query_cpu) {
+                if (cpu_isset(query_cpu, mask)) {
+
+                        /*
+                         * Wait for idle.
+                         */
+                        apic_wait_icr_idle();
+
+                        /*
+                         * prepare target chip field
+                         */
+                        cfg = __prepare_ICR2(x86_cpu_to_apicid[query_cpu]);
+                        apic_write_around(APIC_ICR2, cfg);
+
+                        /*
+                         * program the ICR
+                         */
+                        cfg = __prepare_ICR(0, vector, APIC_DEST_PHYSICAL);
+
+                        /*
+                         * Send the IPI. The write to APIC_ICR fires this off.
+                         */
+                        apic_write_around(APIC_ICR, cfg);
+                }
+        }
+        local_irq_restore(flags);
+}
+
+#endif /* __ASM_IPI_H */