1 files changed, 108 insertions, 0 deletions
diff --git a/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h b/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h
new file mode 100644
index 000000000..acd919a85
--- /dev/null
+++ b/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h
@@ -0,0 +1,108 @@
+#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 */