[block] Remove userptr_t from block device abstraction

Simplify the block device code by assuming that all read/write buffers
are directly accessible via pointer dereferences.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/ata.h

@@ -2,7 +2,6 @@
 #define _IPXE_ATA_H
 
 #include <stdint.h>
-#include <ipxe/uaccess.h>
 #include <ipxe/interface.h>
 
 /** @file
@@ -173,7 +172,7 @@ struct ata_cmd {
 	 * If non-NULL, this buffer must be ata_command::cb::count
 	 * sectors in size.
 	 */
-	userptr_t data_out;
+	void *data_out;
 	/** Data-out buffer length
 	 *
 	 * Must be zero if @c data_out is NULL
@@ -184,7 +183,7 @@ struct ata_cmd {
 	 * If non-NULL, this buffer must be ata_command::cb::count
 	 * sectors in size.
 	 */
-	userptr_t data_in;
+	void *data_in;
 	/** Data-in buffer length
 	 *
 	 * Must be zero if @c data_in is NULL

src/include/ipxe/blockdev.h

@@ -11,7 +11,6 @@
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
-#include <ipxe/uaccess.h>
 #include <ipxe/interface.h>
 
 /** Block device capacity */
@@ -25,20 +24,20 @@ struct block_device_capacity {
 };
 
 extern int block_read ( struct interface *control, struct interface *data,
-			uint64_t lba, unsigned int count,
-			userptr_t buffer, size_t len );
+			uint64_t lba, unsigned int count, void *buffer,
+			size_t len );
 #define block_read_TYPE( object_type )					\
 	typeof ( int ( object_type, struct interface *data,		\
 		       uint64_t lba, unsigned int count,		\
-		       userptr_t buffer, size_t len ) )
+		       void *buffer, size_t len ) )
 
 extern int block_write ( struct interface *control, struct interface *data,
-			 uint64_t lba, unsigned int count,
-			 userptr_t buffer, size_t len );
+			 uint64_t lba, unsigned int count, void *buffer,
+			 size_t len );
 #define block_write_TYPE( object_type )					\
 	typeof ( int ( object_type, struct interface *data,		\
 		       uint64_t lba, unsigned int count,		\
-		       userptr_t buffer, size_t len ) )
+		       void *buffer, size_t len ) )
 
 extern int block_read_capacity ( struct interface *control,
 				 struct interface *data );

src/include/ipxe/blocktrans.h

@@ -13,7 +13,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #include <ipxe/refcnt.h>
 #include <ipxe/interface.h>
 #include <ipxe/xferbuf.h>
-#include <ipxe/uaccess.h>
 
 /** A block device translator */
 struct block_translator {
@@ -27,12 +26,12 @@ struct block_translator {
 	/** Data transfer buffer */
 	struct xfer_buffer xferbuf;
 	/** Data buffer */
-	userptr_t buffer;
+	void *buffer;
 	/** Block size */
 	size_t blksize;
 };
 
-extern int block_translate ( struct interface *block,
-			     userptr_t buffer, size_t size );
+extern int block_translate ( struct interface *block, void *buffer,
+			     size_t size );
 
 #endif /* _IPXE_BLOCKTRANS_H */

src/include/ipxe/sanboot.h

@@ -261,9 +261,9 @@ extern struct san_device * sandev_next ( unsigned int drive );
 extern int sandev_reopen ( struct san_device *sandev );
 extern int sandev_reset ( struct san_device *sandev );
 extern int sandev_read ( struct san_device *sandev, uint64_t lba,
-			 unsigned int count, userptr_t buffer );
+			 unsigned int count, void *buffer );
 extern int sandev_write ( struct san_device *sandev, uint64_t lba,
-			  unsigned int count, userptr_t buffer );
+			  unsigned int count, void *buffer );
 extern struct san_device * alloc_sandev ( struct uri **uris, unsigned int count,
 					  size_t priv_size );
 extern int register_sandev ( struct san_device *sandev, unsigned int drive,

src/include/ipxe/scsi.h

@@ -2,7 +2,6 @@
 #define _IPXE_SCSI_H
 
 #include <stdint.h>
-#include <ipxe/uaccess.h>
 #include <ipxe/interface.h>
 
 /** @file
@@ -252,14 +251,14 @@ struct scsi_cmd {
 	/** CDB for this command */
 	union scsi_cdb cdb;
 	/** Data-out buffer (may be NULL) */
-	userptr_t data_out;
+	void *data_out;
 	/** Data-out buffer length
 	 *
 	 * Must be zero if @c data_out is NULL
 	 */
 	size_t data_out_len;
 	/** Data-in buffer (may be NULL) */
-	userptr_t data_in;
+	void *data_in;
 	/** Data-in buffer length
 	 *
 	 * Must be zero if @c data_in is NULL