109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
#ifndef _IPXE_LINUX_UACCESS_H
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#define _IPXE_LINUX_UACCESS_H
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/** @file
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*
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* iPXE user access API for Linux
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*
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* We run with no distinction between internal and external addresses,
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* so can use trivial_virt_to_user() et al.
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*
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* We have no concept of the underlying physical addresses, since
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* these are not exposed to userspace. We provide a stub
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* implementation of user_to_phys() since this is required by
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* alloc_memblock(). We provide no implementation of phys_to_user();
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* any code attempting to access physical addresses will therefore
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* (correctly) fail to link.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#ifdef UACCESS_LINUX
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#define UACCESS_PREFIX_linux
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#else
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#define UACCESS_PREFIX_linux __linux_
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#endif
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/**
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* Convert user buffer to physical address
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*
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* @v userptr User pointer
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* @v offset Offset from user pointer
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* @ret phys_addr Physical address
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*/
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static inline __always_inline unsigned long
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UACCESS_INLINE ( linux, user_to_phys ) ( userptr_t userptr, off_t offset ) {
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/* We do not know the real underlying physical address. We
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* provide this stub implementation only because it is
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* required by alloc_memblock() (which allocates memory with
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* specified physical address alignment). We assume that the
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* low-order bits of virtual addresses match the low-order
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* bits of physical addresses, and so simply returning the
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* virtual address will suffice for the purpose of determining
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* alignment.
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*/
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return ( userptr + offset );
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}
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static inline __always_inline userptr_t
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UACCESS_INLINE ( linux, virt_to_user ) ( volatile const void *addr ) {
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return trivial_virt_to_user ( addr );
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}
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static inline __always_inline void *
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UACCESS_INLINE ( linux, user_to_virt ) ( userptr_t userptr, off_t offset ) {
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return trivial_user_to_virt ( userptr, offset );
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}
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static inline __always_inline userptr_t
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UACCESS_INLINE ( linux, userptr_add ) ( userptr_t userptr, off_t offset ) {
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return trivial_userptr_add ( userptr, offset );
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}
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static inline __always_inline off_t
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UACCESS_INLINE ( linux, userptr_sub ) ( userptr_t userptr,
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userptr_t subtrahend ) {
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return trivial_userptr_sub ( userptr, subtrahend );
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}
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static inline __always_inline void
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UACCESS_INLINE ( linux, memcpy_user ) ( userptr_t dest, off_t dest_off,
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userptr_t src, off_t src_off,
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size_t len ) {
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trivial_memcpy_user ( dest, dest_off, src, src_off, len );
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}
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static inline __always_inline void
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UACCESS_INLINE ( linux, memmove_user ) ( userptr_t dest, off_t dest_off,
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userptr_t src, off_t src_off,
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size_t len ) {
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trivial_memmove_user ( dest, dest_off, src, src_off, len );
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}
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static inline __always_inline int
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UACCESS_INLINE ( linux, memcmp_user ) ( userptr_t first, off_t first_off,
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userptr_t second, off_t second_off,
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size_t len ) {
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return trivial_memcmp_user ( first, first_off, second, second_off, len);
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}
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static inline __always_inline void
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UACCESS_INLINE ( linux, memset_user ) ( userptr_t buffer, off_t offset,
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int c, size_t len ) {
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trivial_memset_user ( buffer, offset, c, len );
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}
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static inline __always_inline size_t
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UACCESS_INLINE ( linux, strlen_user ) ( userptr_t buffer, off_t offset ) {
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return trivial_strlen_user ( buffer, offset );
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}
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static inline __always_inline off_t
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UACCESS_INLINE ( linux, memchr_user ) ( userptr_t buffer, off_t offset,
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int c, size_t len ) {
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return trivial_memchr_user ( buffer, offset, c, len );
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}
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#endif /* _IPXE_LINUX_UACCESS_H */
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