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/*
 * 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/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 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

#include <asm/extable.h>

/*
 * 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)));		\
})

static inline unsigned long __must_check
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	memcpy(to, (const void __force *)from, n);
	return 0;
}

static inline unsigned long __must_check
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	memcpy((void __force *)to, from, n);
	SSYNC();
	return 0;
}

#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
/*
 * 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;
}

/*
 * 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 */

Filemanager

Name Type Size Permission Actions
Kbuild File 658 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 1.55 KB 0644
barrier.h File 2.55 KB 0644
bfin-global.h File 2.8 KB 0644
bfin-lq035q1.h File 868 B 0644
bfin5xx_spi.h File 2.07 KB 0644
bfin_can.h File 36.04 KB 0644
bfin_dma.h File 5.46 KB 0644
bfin_pfmon.h File 1.11 KB 0644
bfin_ppi.h File 9.01 KB 0644
bfin_sdh.h File 7.2 KB 0644
bfin_serial.h File 17.02 KB 0644
bfin_simple_timer.h File 949 B 0644
bfin_sport.h File 1.21 KB 0644
bfin_sport3.h File 5.47 KB 0644
bfin_twi.h File 6.25 KB 0644
bfin_watchdog.h File 696 B 0644
bfrom.h File 3.36 KB 0644
bitops.h File 3.45 KB 0644
blackfin.h File 1.55 KB 0644
bug.h File 1.49 KB 0644
cache.h File 1.47 KB 0644
cacheflush.h File 3.79 KB 0644
cdef_LPBlackfin.h File 18.93 KB 0644
checksum.h File 899 B 0644
clkdev.h File 318 B 0644
clocks.h File 1.66 KB 0644
cmpxchg.h File 3.2 KB 0644
context.S File 5.92 KB 0644
cplb.h File 4.86 KB 0644
cplbinit.h File 1.6 KB 0644
cpu.h File 443 B 0644
def_LPBlackfin.h File 28.6 KB 0644
delay.h File 917 B 0644
dma-mapping.h File 1.09 KB 0644
dma.h File 9.28 KB 0644
dpmc.h File 18.24 KB 0644
early_printk.h File 1.09 KB 0644
elf.h File 4.88 KB 0644
entry.h File 5.27 KB 0644
exec.h File 37 B 0644
fixed_code.h File 806 B 0644
flat.h File 1.41 KB 0644
ftrace.h File 1.37 KB 0644
gpio.h File 5.91 KB 0644
gptimers.h File 8.95 KB 0644
hardirq.h File 301 B 0644
io.h File 1.52 KB 0644
ipipe.h File 5.81 KB 0644
ipipe_base.h File 2.38 KB 0644
irq.h File 879 B 0644
irq_handler.h File 1.93 KB 0644
irqflags.h File 7.13 KB 0644
kgdb.h File 3.23 KB 0644
l1layout.h File 879 B 0644
linkage.h File 205 B 0644
mem_init.h File 13.1 KB 0644
mem_map.h File 1.73 KB 0644
mmu.h File 713 B 0644
mmu_context.h File 5.35 KB 0644
module.h File 410 B 0644
nand.h File 895 B 0644
nmi.h File 195 B 0644
page.h File 546 B 0644
page_offset.h File 192 B 0644
pci.h File 310 B 0644
pda.h File 1.86 KB 0644
perf_event.h File 23 B 0644
pgtable.h File 3 KB 0644
pm.h File 590 B 0644
portmux.h File 16.38 KB 0644
processor.h File 3.21 KB 0644
pseudo_instructions.h File 391 B 0644
ptrace.h File 1.19 KB 0644
reboot.h File 446 B 0644
rwlock.h File 142 B 0644
scb.h File 445 B 0644
sections.h File 2 KB 0644
segment.h File 226 B 0644
smp.h File 1.34 KB 0644
spinlock.h File 1.87 KB 0644
spinlock_types.h File 495 B 0644
string.h File 1.04 KB 0644
switch_to.h File 997 B 0644
syscall.h File 2.15 KB 0644
thread_info.h File 2.66 KB 0644
time.h File 1.33 KB 0644
timex.h File 477 B 0644
tlb.h File 481 B 0644
tlbflush.h File 88 B 0644
trace.h File 2.67 KB 0644
traps.h File 4.87 KB 0644
uaccess.h File 5.79 KB 0644
unistd.h File 523 B 0644
vga.h File 29 B 0644