--- /dev/null
+/*
+ * 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 */
Code Review / kvmfornfv.git / blobdiff