1 files changed, 112 insertions, 0 deletions
diff --git a/arch/mips/include/asm/paccess.h b/arch/mips/include/asm/paccess.h
new file mode 100644
index 00000000000..c2394f8b0fe
--- /dev/null
+++ b/arch/mips/include/asm/paccess.h
@@ -0,0 +1,112 @@
+/*
+ * 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) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ *
+ * Protected memory access.  Used for everything that might take revenge
+ * by sending a DBE error like accessing possibly non-existant memory or
+ * devices.
+ */
+#ifndef _ASM_PACCESS_H
+#define _ASM_PACCESS_H
+
+#include <linux/errno.h>
+
+#ifdef CONFIG_32BIT
+#define __PA_ADDR	".word"
+#endif
+#ifdef CONFIG_64BIT
+#define __PA_ADDR	".dword"
+#endif
+
+extern asmlinkage void handle_ibe(void);
+extern asmlinkage void handle_dbe(void);
+
+#define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr)))
+#define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr)))
+
+struct __large_pstruct { unsigned long buf[100]; };
+#define __mp(x) (*(struct __large_pstruct *)(x))
+
+#define __get_dbe(x, ptr, size)						\
+({									\
+	long __gu_err;							\
+	__typeof__(*(ptr)) __gu_val;					\
+	unsigned long __gu_addr;					\
+	__asm__("":"=r" (__gu_val));					\
+	__gu_addr = (unsigned long) (ptr);				\
+	__asm__("":"=r" (__gu_err));					\
+	switch (size) {							\
+	case 1: __get_dbe_asm("lb"); break;				\
+	case 2: __get_dbe_asm("lh"); break;				\
+	case 4: __get_dbe_asm("lw"); break;				\
+	case 8:  __get_dbe_asm("ld"); break;				\
+	default: __get_dbe_unknown(); break;				\
+	}								\
+	x = (__typeof__(*(ptr))) __gu_val;				\
+	__gu_err;							\
+})
+
+#define __get_dbe_asm(insn)						\
+{									\
+	__asm__ __volatile__(						\
+	"1:\t" insn "\t%1,%2\n\t"					\
+	"move\t%0,$0\n"							\
+	"2:\n\t"							\
+	".section\t.fixup,\"ax\"\n"					\
+	"3:\tli\t%0,%3\n\t"						\
+	"move\t%1,$0\n\t"						\
+	"j\t2b\n\t"							\
+	".previous\n\t"							\
+	".section\t__dbe_table,\"a\"\n\t"				\
+	__PA_ADDR "\t1b, 3b\n\t"					\
+	".previous"							\
+	:"=r" (__gu_err), "=r" (__gu_val)				\
+	:"o" (__mp(__gu_addr)), "i" (-EFAULT));				\
+}
+
+extern void __get_dbe_unknown(void);
+
+#define __put_dbe(x, ptr, size)						\
+({									\
+	long __pu_err;							\
+	__typeof__(*(ptr)) __pu_val;					\
+	long __pu_addr;							\
+	__pu_val = (x);							\
+	__pu_addr = (long) (ptr);					\
+	__asm__("":"=r" (__pu_err));					\
+	switch (size) {							\
+	case 1: __put_dbe_asm("sb"); break;				\
+	case 2: __put_dbe_asm("sh"); break;				\
+	case 4: __put_dbe_asm("sw"); break;				\
+	case 8: __put_dbe_asm("sd"); break;				\
+	default: __put_dbe_unknown(); break;				\
+	}								\
+	__pu_err;							\
+})
+
+#define __put_dbe_asm(insn)						\
+{									\
+	__asm__ __volatile__(						\
+	"1:\t" insn "\t%1,%2\n\t"					\
+	"move\t%0,$0\n"							\
+	"2:\n\t"							\
+	".section\t.fixup,\"ax\"\n"					\
+	"3:\tli\t%0,%3\n\t"						\
+	"j\t2b\n\t"							\
+	".previous\n\t"							\
+	".section\t__dbe_table,\"a\"\n\t"				\
+	__PA_ADDR "\t1b, 3b\n\t"					\
+	".previous"							\
+	: "=r" (__pu_err)						\
+	: "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT));	\
+}
+
+extern void __put_dbe_unknown(void);
+
+extern unsigned long search_dbe_table(unsigned long addr);
+
+#endif /* _ASM_PACCESS_H */