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/*
* Copyright (C) 2010 Piotr Jaroszyński <p.jaroszynski@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _IPXE_LINUX_UACCESS_H
#define _IPXE_LINUX_UACCESS_H
FILE_LICENCE(GPL2_OR_LATER);
/** @file
*
* iPXE user access API for linux
*
* In linux userspace virtual == user == phys addresses.
* Physical addresses also being the same is wrong, but there is no general way
* of converting userspace addresses to physical as what appears to be
* contiguous in userspace is physically fragmented.
* Currently only the DMA memory is special-cased, but its conversion to bus
* addresses is done in phys_to_bus.
* This is known to break virtio as it is passing phys addresses to the virtual
* device.
*/
#ifdef UACCESS_LINUX
#define UACCESS_PREFIX_linux
#else
#define UACCESS_PREFIX_linux __linux_
#endif
static inline __always_inline userptr_t
UACCESS_INLINE(linux, phys_to_user)(unsigned long phys_addr)
{
return phys_addr;
}
static inline __always_inline unsigned long
UACCESS_INLINE(linux, user_to_phys)(userptr_t userptr, off_t offset)
{
return userptr + offset;
}
static inline __always_inline userptr_t
UACCESS_INLINE(linux, virt_to_user)(volatile const void *addr)
{
return trivial_virt_to_user(addr);
}
static inline __always_inline void *
UACCESS_INLINE(linux, user_to_virt)(userptr_t userptr, off_t offset)
{
return trivial_user_to_virt(userptr, offset);
}
static inline __always_inline userptr_t
UACCESS_INLINE(linux, userptr_add)(userptr_t userptr, off_t offset)
{
return trivial_userptr_add(userptr, offset);
}
static inline __always_inline off_t
UACCESS_INLINE(linux, userptr_sub)(userptr_t userptr, userptr_t subtrahend)
{
return trivial_userptr_sub ( userptr, subtrahend );
}
static inline __always_inline void
UACCESS_INLINE(linux, memcpy_user)(userptr_t dest, off_t dest_off, userptr_t src, off_t src_off, size_t len)
{
trivial_memcpy_user(dest, dest_off, src, src_off, len);
}
static inline __always_inline void
UACCESS_INLINE(linux, memmove_user)(userptr_t dest, off_t dest_off, userptr_t src, off_t src_off, size_t len)
{
trivial_memmove_user(dest, dest_off, src, src_off, len);
}
static inline __always_inline int
UACCESS_INLINE(linux, memcmp_user)(userptr_t first, off_t first_off, userptr_t second, off_t second_off, size_t len)
{
return trivial_memcmp_user(first, first_off, second, second_off, len);
}
static inline __always_inline void
UACCESS_INLINE(linux, memset_user)(userptr_t buffer, off_t offset, int c, size_t len)
{
trivial_memset_user(buffer, offset, c, len);
}
static inline __always_inline size_t
UACCESS_INLINE(linux, strlen_user)(userptr_t buffer, off_t offset)
{
return trivial_strlen_user(buffer, offset);
}
static inline __always_inline off_t
UACCESS_INLINE(linux, memchr_user)(userptr_t buffer, off_t offset, int c, size_t len)
{
return trivial_memchr_user(buffer, offset, c, len);
}
#endif /* _IPXE_LINUX_UACCESS_H */
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