Initial import

1 files changed, 275 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
new file mode 100644
index 000000000..90612a7f2
--- /dev/null
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -0,0 +1,275 @@
+/*
+ * Copyright 2004-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ *
+ * Based on: include/asm-m68knommu/uaccess.h
+ */
+
+#ifndef __BLACKFIN_UACCESS_H
+#define __BLACKFIN_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+
+#include <asm/segment.h>
+#include <asm/sections.h>
+
+#define get_ds()        (KERNEL_DS)
+#define get_fs()        (current_thread_info()->addr_limit)
+
+static inline void set_fs(mm_segment_t fs)
+{
+	current_thread_info()->addr_limit = fs;
+}
+
+#define segment_eq(a, b) ((a) == (b))
+
+#define VERIFY_READ	0
+#define VERIFY_WRITE	1
+
+#define access_ok(type, addr, size) _access_ok((unsigned long)(addr), (size))
+
+/*
+ * The fs value determines whether argument validity checking should be
+ * performed or not.  If get_fs() == USER_DS, checking is performed, with
+ * get_fs() == KERNEL_DS, checking is bypassed.
+ */
+
+#ifndef CONFIG_ACCESS_CHECK
+static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; }
+#else
+extern int _access_ok(unsigned long addr, unsigned long size);
+#endif
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue.  No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry {
+	unsigned long insn, fixup;
+};
+
+/*
+ * These are the main single-value transfer routines.  They automatically
+ * use the right size if we just have the right pointer type.
+ */
+
+#define put_user(x, p)						\
+	({							\
+		int _err = 0;					\
+		typeof(*(p)) _x = (x);				\
+		typeof(*(p)) __user *_p = (p);			\
+		if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\
+			_err = -EFAULT;				\
+		}						\
+		else {						\
+		switch (sizeof (*(_p))) {			\
+		case 1:						\
+			__put_user_asm(_x, _p, B);		\
+			break;					\
+		case 2:						\
+			__put_user_asm(_x, _p, W);		\
+			break;					\
+		case 4:						\
+			__put_user_asm(_x, _p,  );		\
+			break;					\
+		case 8: {					\
+			long _xl, _xh;				\
+			_xl = ((__force long *)&_x)[0];		\
+			_xh = ((__force long *)&_x)[1];		\
+			__put_user_asm(_xl, ((__force long __user *)_p)+0, );\
+			__put_user_asm(_xh, ((__force long __user *)_p)+1, );\
+		} break;					\
+		default:					\
+			_err = __put_user_bad();		\
+			break;					\
+		}						\
+		}						\
+		_err;						\
+	})
+
+#define __put_user(x, p) put_user(x, p)
+static inline int bad_user_access_length(void)
+{
+	panic("bad_user_access_length");
+	return -1;
+}
+
+#define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\
+                           __FILE__, __LINE__, __func__),\
+                           bad_user_access_length(), (-EFAULT))
+
+/*
+ * Tell gcc we read from memory instead of writing: this is because
+ * we do not write to any memory gcc knows about, so there are no
+ * aliasing issues.
+ */
+
+#define __ptr(x) ((unsigned long __force *)(x))
+
+#define __put_user_asm(x, p, bhw)			\
+	__asm__ (#bhw"[%1] = %0;\n\t"			\
+		 : /* no outputs */			\
+		 :"d" (x), "a" (__ptr(p)) : "memory")
+
+#define get_user(x, ptr)					\
+({								\
+	int _err = 0;						\
+	unsigned long _val = 0;					\
+	const typeof(*(ptr)) __user *_p = (ptr);		\
+	const size_t ptr_size = sizeof(*(_p));			\
+	if (likely(access_ok(VERIFY_READ, _p, ptr_size))) {	\
+		BUILD_BUG_ON(ptr_size >= 8);			\
+		switch (ptr_size) {				\
+		case 1:						\
+			__get_user_asm(_val, _p, B, (Z));	\
+			break;					\
+		case 2:						\
+			__get_user_asm(_val, _p, W, (Z));	\
+			break;					\
+		case 4:						\
+			__get_user_asm(_val, _p,  , );		\
+			break;					\
+		}						\
+	} else							\
+		_err = -EFAULT;					\
+	x = (__force typeof(*(ptr)))_val;			\
+	_err;							\
+})
+
+#define __get_user(x, p) get_user(x, p)
+
+#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
+
+#define __get_user_asm(x, ptr, bhw, option)	\
+({						\
+	__asm__ __volatile__ (			\
+		"%0 =" #bhw "[%1]" #option ";"	\
+		: "=d" (x)			\
+		: "a" (__ptr(ptr)));		\
+})
+
+#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
+#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#define copy_to_user_ret(to, from, n, retval) ({ if (copy_to_user(to, from, n))\
+				                 return retval; })
+
+#define copy_from_user_ret(to, from, n, retval) ({ if (copy_from_user(to, from, n))\
+                                                   return retval; })
+
+static inline unsigned long __must_check
+copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	if (access_ok(VERIFY_READ, from, n))
+		memcpy(to, (const void __force *)from, n);
+	else
+		return n;
+	return 0;
+}
+
+static inline unsigned long __must_check
+copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		memcpy((void __force *)to, from, n);
+	else
+		return n;
+	SSYNC();
+	return 0;
+}
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+
+static inline long __must_check
+strncpy_from_user(char *dst, const char __user *src, long count)
+{
+	char *tmp;
+	if (!access_ok(VERIFY_READ, src, 1))
+		return -EFAULT;
+	strncpy(dst, (const char __force *)src, count);
+	for (tmp = dst; *tmp && count > 0; tmp++, count--) ;
+	return (tmp - dst);
+}
+
+/*
+ * Get the size of a string in user space.
+ *   src: The string to measure
+ *     n: The maximum valid length
+ *
+ * Get the size of a NUL-terminated string in user space.
+ *
+ * Returns the size of the string INCLUDING the terminating NUL.
+ * On exception, returns 0.
+ * If the string is too long, returns a value greater than n.
+ */
+static inline long __must_check strnlen_user(const char __user *src, long n)
+{
+	if (!access_ok(VERIFY_READ, src, 1))
+		return 0;
+	return strnlen((const char __force *)src, n) + 1;
+}
+
+static inline long __must_check strlen_user(const char __user *src)
+{
+	if (!access_ok(VERIFY_READ, src, 1))
+		return 0;
+	return strlen((const char __force *)src) + 1;
+}
+
+/*
+ * Zero Userspace
+ */
+
+static inline unsigned long __must_check
+__clear_user(void __user *to, unsigned long n)
+{
+	if (!access_ok(VERIFY_WRITE, to, n))
+		return n;
+	memset((void __force *)to, 0, n);
+	return 0;
+}
+
+#define clear_user(to, n) __clear_user(to, n)
+
+/* How to interpret these return values:
+ *	CORE:      can be accessed by core load or dma memcpy
+ *	CORE_ONLY: can only be accessed by core load
+ *	DMA:       can only be accessed by dma memcpy
+ *	IDMA:      can only be accessed by interprocessor dma memcpy (BF561)
+ *	ITEST:     can be accessed by isram memcpy or dma memcpy
+ */
+enum {
+	BFIN_MEM_ACCESS_CORE = 0,
+	BFIN_MEM_ACCESS_CORE_ONLY,
+	BFIN_MEM_ACCESS_DMA,
+	BFIN_MEM_ACCESS_IDMA,
+	BFIN_MEM_ACCESS_ITEST,
+};
+/**
+ *	bfin_mem_access_type() - what kind of memory access is required
+ *	@addr:   the address to check
+ *	@size:   number of bytes needed
+ *	@return: <0 is error, >=0 is BFIN_MEM_ACCESS_xxx enum (see above)
+ */
+int bfin_mem_access_type(unsigned long addr, unsigned long size);
+
+#endif				/* _BLACKFIN_UACCESS_H */