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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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