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#ifndef _IPXE_LINUX_UACCESS_H
#define _IPXE_LINUX_UACCESS_H
/** @file
*
* iPXE user access API for Linux
*
* We have no concept of the underlying physical addresses, since
* these are not exposed to userspace. We provide a stub
* implementation of virt_to_phys() since this is required by the heap
* allocator to determine physical address alignment. We provide a
* matching stub implementation of phys_to_virt().
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
#ifdef UACCESS_LINUX
#define UACCESS_PREFIX_linux
#else
#define UACCESS_PREFIX_linux __linux_
#endif
/**
* Convert virtual address to physical address
*
* @v virt Virtual address
* @ret phys Physical address
*/
static inline __always_inline physaddr_t
UACCESS_INLINE ( linux, virt_to_phys ) ( volatile const void *virt ) {
/* We do not know the real underlying physical address. We
* provide this stub implementation only because it is
* required in order to allocate memory with a 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 ( ( physaddr_t ) virt );
}
/**
* Convert physical address to virtual address
*
* @v phys Physical address
* @ret virt Virtual address
*/
static inline __always_inline void *
UACCESS_INLINE ( linux, phys_to_virt ) ( physaddr_t phys ) {
/* For symmetry with the stub virt_to_phys() */
return ( ( void * ) phys );
}
#endif /* _IPXE_LINUX_UACCESS_H */
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