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[uaccess] Add userptr_sub() to find the difference between two user pointers

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-11-05 16:09:38 +00:00
parent 54a861a7bd
commit 1494d41d0a
4 changed files with 39 additions and 0 deletions
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6
src/arch/i386/include/librm.h
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@@ -68,6 +68,12 @@ UACCESS_INLINE ( librm, userptr_add ) ( userptr_t userptr, off_t offset ) {
return trivial_userptr_add ( userptr, offset );
}
static inline __always_inline off_t
UACCESS_INLINE ( librm, userptr_sub ) ( userptr_t userptr,
userptr_t subtrahend ) {
return trivial_userptr_sub ( userptr, subtrahend );
}
static inline __always_inline void
UACCESS_INLINE ( librm, memcpy_user ) ( userptr_t dest, off_t dest_off,
userptr_t src, off_t src_off,