Port paccess.h from mips64. mips32 paccess.h differs from the original one in

the following:
	o works in case a constant address is passed to get_dbe/put_dbe
	o uses faster binary search :-)
	o the kernel are linked successfully even if get_dbe/put_dbe aren't
	  used

1 files changed, 98 insertions, 0 deletions

diff --git a/include/asm-mips/paccess.h b/include/asm-mips/paccess.h
new file mode 100644
index 000000000..264d8122c
--- /dev/null
+++ b/include/asm-mips/paccess.h
@@ -0,0 +1,98 @@
+/* $Id: paccess.h,v 1.2 2000/01/21 22:34:07 ralf Exp $
+ *
+ * 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>
+
+#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) ({ \
+int __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__( \
+	".set\tpush\n\t" \
+	".set\tnoreorder\n\t" \
+	insn "\t%1,%2\n\t" \
+	"1:\tmove\t%0,$0\n" \
+	".set\tpop\n\t" \
+	"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" \
+	".word\t1b-4,3b\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) ({ \
+int __pu_err; \
+__typeof__(*(ptr)) __pu_val; \
+unsigned long __pu_addr; \
+__pu_val = (x); \
+__pu_addr = (unsigned 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__( \
+	".set\tpush\n\t" \
+	".set\tnoreorder\n\t" \
+	insn "\t%1,%2\n\t" \
+	"1:\tmove\t%0,$0\n" \
+	".set\tpop\n\t" \
+	"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" \
+	".word\t1b-4,3b\n\t" \
+	".previous" \
+	:"=r" (__pu_err) \
+	:"r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); })
+
+extern void __put_dbe_unknown(void);
+
+#endif /* _ASM_PACCESS_H */