Trivial user access API implementations

User access API implementations that can be used by environments in which virtual addresses allow access to all of memory. More...

Functions
static __always_inline userptr_t	trivial_virt_to_user (volatile const void *addr)
	Convert virtual address to user pointer.
static __always_inline void *	trivial_user_to_virt (userptr_t userptr, off_t offset)
	Convert user pointer to virtual address.
static __always_inline userptr_t	trivial_userptr_add (userptr_t userptr, off_t offset)
	Add offset to user pointer.
static __always_inline void	trivial_memcpy_user (userptr_t dest, off_t dest_off, userptr_t src, off_t src_off, size_t len)
	Copy data between user buffers.
static __always_inline void	trivial_memmove_user (userptr_t dest, off_t dest_off, userptr_t src, off_t src_off, size_t len)
	Copy data between user buffers, allowing for overlap.
static __always_inline void	trivial_memset_user (userptr_t buffer, off_t offset, int c, size_t len)
	Fill user buffer with a constant byte.
static __always_inline size_t	trivial_strlen_user (userptr_t buffer, off_t offset)
	Find length of NUL-terminated string in user buffer.
static __always_inline off_t	trivial_memchr_user (userptr_t buffer, off_t offset, int c, size_t len)
	Find character in user buffer.

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Detailed Description

User access API implementations that can be used by environments in which virtual addresses allow access to all of memory.

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Function Documentation

static __always_inline userptr_t trivial_virt_to_user

(

volatile const void *

addr

)

[inline, static]

Convert virtual address to user pointer.

Parameters:

addr

Virtual address

Return values:

userptr

User pointer

Definition at line 55 of file uaccess.h.

                                                   {
        return ( ( userptr_t ) addr );
}

static __always_inline void* trivial_user_to_virt	(	userptr_t	userptr,
		off_t	offset
	)			[inline, static]

Convert user pointer to virtual address.

Parameters:

	userptr	User pointer
	offset	Offset from user pointer

Return values:

addr

Virtual address

This operation is not available under all memory models.

Definition at line 69 of file uaccess.h.

                                                         {
        return ( ( void * ) userptr + offset );
}

static __always_inline userptr_t trivial_userptr_add	(	userptr_t	userptr,
		off_t	offset
	)			[inline, static]

Add offset to user pointer.

Parameters:

	userptr	User pointer
	offset	Offset

Return values:

userptr

New pointer value

Definition at line 81 of file uaccess.h.

                                                        {
        return ( userptr + offset );
}

static __always_inline void trivial_memcpy_user	(	userptr_t	dest,
		off_t	dest_off,
		userptr_t	src,
		off_t	src_off,
		size_t	len
	)			[inline, static]

Copy data between user buffers.

Parameters:

	dest	Destination
	dest_off	Destination offset
	src	Source
	src_off	Source offset
	len	Length

Definition at line 95 of file uaccess.h.

References memcpy.

                                                                 {
        memcpy ( ( ( void * ) dest + dest_off ),
                 ( ( void * ) src + src_off ), len );
}

static __always_inline void trivial_memmove_user	(	userptr_t	dest,
		off_t	dest_off,
		userptr_t	src,
		off_t	src_off,
		size_t	len
	)			[inline, static]

Copy data between user buffers, allowing for overlap.

Parameters:

	dest	Destination
	dest_off	Destination offset
	src	Source
	src_off	Source offset
	len	Length

Definition at line 111 of file uaccess.h.

References memmove().

                                                                  {
        memmove ( ( ( void * ) dest + dest_off ),
                  ( ( void * ) src + src_off ), len );
}

static __always_inline void trivial_memset_user	(	userptr_t	buffer,
		off_t	offset,
		int	c,
		size_t	len
	)			[inline, static]

Fill user buffer with a constant byte.

Parameters:

	buffer	User buffer
	offset	Offset within buffer
	c	Constant byte with which to fill
	len	Length

Definition at line 126 of file uaccess.h.

References memset().

                                                                          {
        memset ( ( ( void * ) buffer + offset ), c, len );
}

static __always_inline size_t trivial_strlen_user	(	userptr_t	buffer,
		off_t	offset
	)			[inline, static]

Find length of NUL-terminated string in user buffer.

Parameters:

	buffer	User buffer
	offset	Offset within buffer

Return values:

len

Length of string (excluding NUL)

Definition at line 138 of file uaccess.h.

References strlen().

                                                       {
        return strlen ( ( void * ) buffer + offset );
}

static __always_inline off_t trivial_memchr_user	(	userptr_t	buffer,
		off_t	offset,
		int	c,
		size_t	len
	)			[inline, static]

Find character in user buffer.

Parameters:

	buffer	User buffer
	offset	Starting offset within buffer
	c	Character to search for
	len	Length of user buffer

Return values:

offset

Offset of character, or <0 if not found

Definition at line 152 of file uaccess.h.

References memchr().

                                                                          {
        void *found;

        found = memchr ( ( ( void * ) buffer + offset ), c, len );
        return ( found ? ( found - ( void * ) buffer ) : -1 );
}