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#ifndef _IPXE_LINUX_UACCESS_H
#define _IPXE_LINUX_UACCESS_H
/** @file
*
* iPXE user access API for Linux
*
* We run with no distinction between internal and external addresses,
* so can use trivial_virt_to_user() et al.
*
* We have no concept of the underlying physical addresses, since
* these are not exposed to userspace. We provide a stub
* implementation of user_to_phys() since this is required by
* alloc_memblock(). We provide no implementation of phys_to_user();
* any code attempting to access physical addresses will therefore
* (correctly) fail to link.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifdef UACCESS_LINUX
#define UACCESS_PREFIX_linux
#else
#define UACCESS_PREFIX_linux __linux_
#endif
/**
* Convert user buffer to physical address
*
* @v userptr User pointer
* @v offset Offset from user pointer
* @ret phys_addr Physical address
*/
static inline __always_inline unsigned long
UACCESS_INLINE ( linux, user_to_phys ) ( userptr_t userptr, off_t offset ) {
/* We do not know the real underlying physical address. We
* provide this stub implementation only because it is
* required by alloc_memblock() (which allocates memory with
* specified physical address alignment). We assume that the
* low-order bits of virtual addresses match the low-order
* bits of physical addresses, and so simply returning the
* virtual address will suffice for the purpose of determining
* alignment.
*/
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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