aboutsummaryrefslogtreecommitdiff
path: root/arch/mn10300/lib/usercopy.c
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2008-02-08 04:19:31 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:30 -0800
commitb920de1b77b72ca9432ac3f97edb26541e65e5dd (patch)
tree40fa9be1470e929c47927dea7eddf184c0204229 /arch/mn10300/lib/usercopy.c
parentef3d534754f31fed9c3b976fee1ece1b3bc38282 (diff)
downloadlinux-linaro-stable-b920de1b77b72ca9432ac3f97edb26541e65e5dd.tar.gz
mn10300: add the MN10300/AM33 architecture to the kernel
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/mn10300/lib/usercopy.c')
-rw-r--r--arch/mn10300/lib/usercopy.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/mn10300/lib/usercopy.c b/arch/mn10300/lib/usercopy.c
new file mode 100644
index 000000000000..a75b203059c1
--- /dev/null
+++ b/arch/mn10300/lib/usercopy.c
@@ -0,0 +1,166 @@
+/* MN10300 Userspace accessor functions
+ *
+ * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <asm/uaccess.h>
+
+unsigned long
+__generic_copy_to_user(void *to, const void *from, unsigned long n)
+{
+ if (access_ok(VERIFY_WRITE, to, n))
+ __copy_user(to, from, n);
+ return n;
+}
+
+unsigned long
+__generic_copy_from_user(void *to, const void *from, unsigned long n)
+{
+ if (access_ok(VERIFY_READ, from, n))
+ __copy_user_zeroing(to, from, n);
+ return n;
+}
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+#define __do_strncpy_from_user(dst, src, count, res) \
+do { \
+ int w; \
+ asm volatile( \
+ " mov %1,%0\n" \
+ " cmp 0,%1\n" \
+ " beq 2f\n" \
+ "0:\n" \
+ " movbu (%5),%2\n" \
+ "1:\n" \
+ " movbu %2,(%6)\n" \
+ " inc %5\n" \
+ " inc %6\n" \
+ " cmp 0,%2\n" \
+ " beq 2f\n" \
+ " add -1,%1\n" \
+ " bne 0b\n" \
+ "2:\n" \
+ " sub %1,%0\n" \
+ "3:\n" \
+ " .section .fixup,\"ax\"\n" \
+ "4:\n" \
+ " mov %3,%0\n" \
+ " jmp 3b\n" \
+ " .previous\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .balign 4\n" \
+ " .long 0b,4b\n" \
+ " .long 1b,4b\n" \
+ " .previous" \
+ :"=&r"(res), "=r"(count), "=&r"(w) \
+ :"i"(-EFAULT), "1"(count), "a"(src), "a"(dst) \
+ :"memory"); \
+} while (0)
+
+long
+__strncpy_from_user(char *dst, const char *src, long count)
+{
+ long res;
+ __do_strncpy_from_user(dst, src, count, res);
+ return res;
+}
+
+long
+strncpy_from_user(char *dst, const char *src, long count)
+{
+ long res = -EFAULT;
+ if (access_ok(VERIFY_READ, src, 1))
+ __do_strncpy_from_user(dst, src, count, res);
+ return res;
+}
+
+
+/*
+ * Clear a userspace memory
+ */
+#define __do_clear_user(addr, size) \
+do { \
+ int w; \
+ asm volatile( \
+ " cmp 0,%0\n" \
+ " beq 1f\n" \
+ " clr %1\n" \
+ "0: movbu %1,(%3,%2)\n" \
+ " inc %3\n" \
+ " cmp %0,%3\n" \
+ " bne 0b\n" \
+ "1:\n" \
+ " sub %3,%0\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: jmp 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .balign 4\n" \
+ " .long 0b,3b\n" \
+ ".previous\n" \
+ : "+r"(size), "=&r"(w) \
+ : "a"(addr), "d"(0) \
+ : "memory"); \
+} while (0)
+
+unsigned long
+__clear_user(void *to, unsigned long n)
+{
+ __do_clear_user(to, n);
+ return n;
+}
+
+unsigned long
+clear_user(void *to, unsigned long n)
+{
+ if (access_ok(VERIFY_WRITE, to, n))
+ __do_clear_user(to, n);
+ return n;
+}
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 on exception, a value greater than N if too long
+ */
+long strnlen_user(const char *s, long n)
+{
+ unsigned long res, w;
+
+ if (!__addr_ok(s))
+ return 0;
+
+ if (n < 0 || n + (u_long) s > current_thread_info()->addr_limit.seg)
+ n = current_thread_info()->addr_limit.seg - (u_long)s;
+
+ asm volatile(
+ "0: cmp %4,%0\n"
+ " beq 2f\n"
+ "1: movbu (%0,%3),%1\n"
+ " inc %0\n"
+ " cmp 0,%1\n"
+ " beq 3f\n"
+ " bra 0b\n"
+ "2: clr %0\n"
+ "3:\n"
+ ".section .fixup,\"ax\"\n"
+ "4: jmp 2b\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .balign 4\n"
+ " .long 1b,4b\n"
+ ".previous\n"
+ :"=d"(res), "=&r"(w)
+ :"0"(0), "a"(s), "r"(n)
+ :"memory");
+ return res;
+}