Added user_to_phys() and memset_user().

src/arch/i386/include/librm.h

@@ -152,6 +152,19 @@ copy_user ( userptr_t dest, off_t dest_off, userptr_t src, off_t src_off,
 		 len );
 }
 
+/**
+ * Fill user buffer with a constant byte
+ *
+ * @v buffer		User buffer
+ * @v offset		Offset within buffer
+ * @v c			Constant byte with which to fill
+ * @v len		Length
+ */
+static inline __attribute__ (( always_inline )) void
+memset_user ( userptr_t buffer, off_t offset, int c, size_t len ) {
+	memset ( ( ( void * ) buffer + offset ), c, len );
+}
+
 /**
  * Convert virtual address to user buffer
  *
@@ -190,6 +203,18 @@ phys_to_user ( physaddr_t physical ) {
 	return virt_to_user ( phys_to_virt ( physical ) );
 }
 
+/**
+ * Convert user buffer to physical address
+ *
+ * @v buffer		User buffer
+ * @v offset		Offset within user buffer
+ * @ret physical	Physical address
+ */
+static inline __attribute__ (( always_inline )) physaddr_t
+user_to_phys ( userptr_t buffer, off_t offset ) {
+	return virt_to_phys ( ( void * ) buffer + offset );
+}
+
 /* Copy to/from real-mode stack */
 extern uint16_t copy_to_rm_stack ( void *data, size_t size );
 extern void remove_from_rm_stack ( void *data, size_t size );