x86: boot protocol updates

Also update field names to simply payload_{offset,length} so as to not rule
out uncompressed images.

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 8 deletions

diff --git a/Documentation/i386/boot.txt b/Documentation/i386/boot.txt
index 05c24dfd7ecf..2eb16100bb3f 100644
--- a/Documentation/i386/boot.txt
+++ b/Documentation/i386/boot.txt
@@ -170,8 +170,8 @@ Offset	Proto	Name		Meaning
 0238/4  2.06+   cmdline_size    Maximum size of the kernel command line
 023C/4  2.07+   hardware_subarch Hardware subarchitecture
 0240/8  2.07+   hardware_subarch_data Subarchitecture-specific data
-0248/4  2.08+   compressed_payload_offset
-024C/4  2.08+   compressed_payload_length
+0248/4  2.08+   payload_offset  Offset of kernel payload
+024C/4  2.08+   payload_length  Length of kernel payload
 
 (1) For backwards compatibility, if the setup_sects field contains 0, the
     real value is 4.
@@ -514,22 +514,24 @@ Protocol:	2.07+
 
   A pointer to data that is specific to hardware subarch
 
-Field name:     compressed_payload_offset
+Field name:     payload_offset
 Type:           read
 Offset/size:    0x248/4
 Protocol:       2.08+
 
   If non-zero then this field contains the offset from the end of the
-  real-mode code to the compressed payload. The compression format
-  should be determined using the standard magic number, currently only
-  gzip is used.
+  real-mode code to the payload.
+
+  The payload may be compressed. The format of both the compressed and
+  uncompressed data should be determined using the standard magic
+  numbers. Currently only gzip compressed ELF is used.
   
-Field name:     compressed_payload_length
+Field name:     payload_length
 Type:           read
 Offset/size:    0x24c/4
 Protocol:       2.08+
 
-  The length of the compressed payload.
+  The length of the payload.
 
 **** THE IMAGE CHECKSUM