From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-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!
---
 include/asm-x86_64/ipi.h | 113 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 include/asm-x86_64/ipi.h

(limited to 'include/asm-x86_64/ipi.h')

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 */
-- 
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