From 1513ff9b7899ab588401c89db0e99903dbf5f886 Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 28 Nov 1994 11:59:19 +0000
Subject: Import of Linus's Linux 1.1.68

---
 include/asm-mips/system.h | 70 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 include/asm-mips/system.h

(limited to 'include/asm-mips/system.h')

diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
new file mode 100644
index 000000000..5e0dbfe3c
--- /dev/null
+++ b/include/asm-mips/system.h
@@ -0,0 +1,70 @@
+/*
+ * include/asm-mips/system.h
+ *
+ * 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 by Ralf Baechle
+ */
+
+#ifndef _ASM_MIPS_SYSTEM_H_
+#define _ASM_MIPS_SYSTEM_H_
+
+#include <asm/segment.h>
+#include <mips/mipsregs.h>
+
+/*
+ * move_to_user_mode() doesn't switch to user mode on the mips, since
+ * that would run us into problems: The kernel is located at virtual
+ * address 0x80000000. If we now would switch over to user mode, we
+ * we would immediately get an address error exception.
+ * Anyway - we don't have problems with a task running in kernel mode,
+ * as long it's code is foolproof.
+ */
+#define move_to_user_mode()
+
+#define sti() \
+__asm__ __volatile__( \
+	"mfc0\t$1,"STR(CP0_STATUS)"\n\t" \
+	"ori\t$1,$1,1\n\t" \
+	"mtc0\t$1,"STR(CP0_STATUS)"\n\t" \
+	: /* no outputs */ \
+	: /* no inputs */ \
+	: "$1","memory")
+
+#define cli() \
+__asm__ __volatile__( \
+	"mfc0\t$1,"STR(CP0_STATUS)"\n\t" \
+	"srl\t$1,$1,1\n\t" \
+	"sll\t$1,$1,1\n\t" \
+	"mtc0\t$1,"STR(CP0_STATUS)"\n\t" \
+	: /* no outputs */ \
+	: /* no inputs */ \
+	: "$1","memory")
+
+#define nop() __asm__ __volatile__ ("nop")
+
+#define save_flags(x) \
+__asm__ __volatile__( \
+	".set\tnoreorder\n\t" \
+	".set\tnoat\n\t" \
+	"mfc0\t%0,$12\n\t" \
+	".set\tat\n\t" \
+	".set\treorder" \
+	: "=r" (x) \
+	: /* no inputs */ \
+	: "memory")
+
+#define restore_flags(x) \
+__asm__ __volatile__( \
+	".set\tnoreorder\n\t" \
+	".set\tnoat\n\t" \
+	"mtc0\t%0,$12\n\t" \
+	".set\tat\n\t" \
+	".set\treorder" \
+	: /* no output */ \
+	: "r" (x) \
+	: "memory")
+
+#endif /* _ASM_MIPS_SYSTEM_H_ */
-- 
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