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-mips/interrupt.h

@@ -0,0 +1,134 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
+ * Copyright (C) 1996 by Paul M. Antoine
+ * Copyright (C) 1999 Silicon Graphics
+ * Copyright (C) 2000 MIPS Technologies, Inc.
+ */
+#ifndef _ASM_INTERRUPT_H
+#define _ASM_INTERRUPT_H
+
+#include <asm/hazards.h>
+
+__asm__ (
+	".macro\tlocal_irq_enable\n\t"
+	".set\tpush\n\t"
+	".set\treorder\n\t"
+	".set\tnoat\n\t"
+	"mfc0\t$1,$12\n\t"
+	"ori\t$1,0x1f\n\t"
+	"xori\t$1,0x1e\n\t"
+	"mtc0\t$1,$12\n\t"
+	"irq_enable_hazard\n\t"
+	".set\tpop\n\t"
+	".endm");
+
+static inline void local_irq_enable(void)
+{
+	__asm__ __volatile__(
+		"local_irq_enable"
+		: /* no outputs */
+		: /* no inputs */
+		: "memory");
+}
+
+/*
+ * For cli() we have to insert nops to make sure that the new value
+ * has actually arrived in the status register before the end of this
+ * macro.
+ * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
+ * no nops at all.
+ */
+__asm__ (
+	".macro\tlocal_irq_disable\n\t"
+	".set\tpush\n\t"
+	".set\tnoat\n\t"
+	"mfc0\t$1,$12\n\t"
+	"ori\t$1,1\n\t"
+	"xori\t$1,1\n\t"
+	".set\tnoreorder\n\t"
+	"mtc0\t$1,$12\n\t"
+	"irq_disable_hazard\n\t"
+	".set\tpop\n\t"
+	".endm");
+
+static inline void local_irq_disable(void)
+{
+	__asm__ __volatile__(
+		"local_irq_disable"
+		: /* no outputs */
+		: /* no inputs */
+		: "memory");
+}
+
+__asm__ (
+	".macro\tlocal_save_flags flags\n\t"
+	".set\tpush\n\t"
+	".set\treorder\n\t"
+	"mfc0\t\\flags, $12\n\t"
+	".set\tpop\n\t"
+	".endm");
+
+#define local_save_flags(x)						\
+__asm__ __volatile__(							\
+	"local_save_flags %0"						\
+	: "=r" (x))
+
+__asm__ (
+	".macro\tlocal_irq_save result\n\t"
+	".set\tpush\n\t"
+	".set\treorder\n\t"
+	".set\tnoat\n\t"
+	"mfc0\t\\result, $12\n\t"
+	"ori\t$1, \\result, 1\n\t"
+	"xori\t$1, 1\n\t"
+	".set\tnoreorder\n\t"
+	"mtc0\t$1, $12\n\t"
+	"irq_disable_hazard\n\t"
+	".set\tpop\n\t"
+	".endm");
+
+#define local_irq_save(x)						\
+__asm__ __volatile__(							\
+	"local_irq_save\t%0"						\
+	: "=r" (x)							\
+	: /* no inputs */						\
+	: "memory")
+
+__asm__ (
+	".macro\tlocal_irq_restore flags\n\t"
+	".set\tnoreorder\n\t"
+	".set\tnoat\n\t"
+	"mfc0\t$1, $12\n\t"
+	"andi\t\\flags, 1\n\t"
+	"ori\t$1, 1\n\t"
+	"xori\t$1, 1\n\t"
+	"or\t\\flags, $1\n\t"
+	"mtc0\t\\flags, $12\n\t"
+	"irq_disable_hazard\n\t"
+	".set\tat\n\t"
+	".set\treorder\n\t"
+	".endm");
+
+#define local_irq_restore(flags)					\
+do {									\
+	unsigned long __tmp1;						\
+									\
+	__asm__ __volatile__(						\
+		"local_irq_restore\t%0"					\
+		: "=r" (__tmp1)						\
+		: "0" (flags)						\
+		: "memory");						\
+} while(0)
+
+#define irqs_disabled()							\
+({									\
+	unsigned long flags;						\
+	local_save_flags(flags);					\
+	!(flags & 1);							\
+})
+
+#endif /* _ASM_INTERRUPT_H */