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authorIan Campbell <ijc@hellion.org.uk>2008-02-19 06:12:30 -0500
committerIngo Molnar <mingo@elte.hu>2008-04-17 11:40:48 -0400
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 05c24dfd7ecf..2eb16100bb3f 100644
--- a/Documentation/i386/boot.txt
+++ b/Documentation/i386/boot.txt
@@ -170,8 +170,8 @@ Offset Proto Name Meaning
1700238/4 2.06+ cmdline_size Maximum size of the kernel command line 1700238/4 2.06+ cmdline_size Maximum size of the kernel command line
171023C/4 2.07+ hardware_subarch Hardware subarchitecture 171023C/4 2.07+ hardware_subarch Hardware subarchitecture
1720240/8 2.07+ hardware_subarch_data Subarchitecture-specific data 1720240/8 2.07+ hardware_subarch_data Subarchitecture-specific data
1730248/4 2.08+ compressed_payload_offset 1730248/4 2.08+ payload_offset Offset of kernel payload
174024C/4 2.08+ compressed_payload_length 174024C/4 2.08+ payload_length Length of kernel payload
175 175
176(1) For backwards compatibility, if the setup_sects field contains 0, the 176(1) For backwards compatibility, if the setup_sects field contains 0, the
177 real value is 4. 177 real value is 4.
@@ -514,22 +514,24 @@ Protocol: 2.07+
514 514
515 A pointer to data that is specific to hardware subarch 515 A pointer to data that is specific to hardware subarch
516 516
517Field name: compressed_payload_offset 517Field name: payload_offset
518Type: read 518Type: read
519Offset/size: 0x248/4 519Offset/size: 0x248/4
520Protocol: 2.08+ 520Protocol: 2.08+
521 521
522 If non-zero then this field contains the offset from the end of the 522 If non-zero then this field contains the offset from the end of the
523 real-mode code to the compressed payload. The compression format 523 real-mode code to the payload.
524 should be determined using the standard magic number, currently only 524
525 gzip is used. 525 The payload may be compressed. The format of both the compressed and
526 uncompressed data should be determined using the standard magic
527 numbers. Currently only gzip compressed ELF is used.
526 528
527Field name: compressed_payload_length 529Field name: payload_length
528Type: read 530Type: read
529Offset/size: 0x24c/4 531Offset/size: 0x24c/4
530Protocol: 2.08+ 532Protocol: 2.08+
531 533
532 The length of the compressed payload. 534 The length of the payload.
533 535
534**** THE IMAGE CHECKSUM 536**** THE IMAGE CHECKSUM
535 537