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authorIan Campbell <ijc@hellion.org.uk>2008-02-19 11:12:30 +0000
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:40:48 +0200
commit87253d1b4f2b5a29bdfc6275b9fb52a47d72df64 (patch)
treec2381c07282c356a3e64828b6d0a75e275938d44 /Documentation/i386/boot.txt
parentbc0a733facbbde6c464e3ba5e165607fe4824cca (diff)
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>
Diffstat (limited to 'Documentation/i386/boot.txt')
-rw-r--r--Documentation/i386/boot.txt18
1 files changed, 10 insertions, 8 deletions
diff --git a/Documentation/i386/boot.txt b/Documentation/i386/boot.txt
index 05c24dfd7ec..2eb16100bb3 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