Introduce relocatable_kernel and kernel_alignment fields.
Protocol 2.06: (Kernel 2.6.22) Added a field that contains the size of
- the boot command line
+ the boot command line.
+Protocol 2.07: (Kernel 2.6.24) Added paravirtualised boot protocol.
+ Introduced hardware_subarch and hardware_subarch_data
+ and KEEP_SEGMENTS flag in load_flags.
+
+Protocol 2.08: (Kernel 2.6.26) Added crc32 checksum and ELF format
+ payload. Introduced payload_offset and payload length
+ fields to aid in locating the payload.
+
+Protocol 2.09: (Kernel 2.6.26) Added a field of 64-bit physical
+ pointer to single linked list of struct setup_data.
**** MEMORY LAYOUT
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
+0250/8 2.09+ setup_data 64-bit physical pointer to linked list
+ of struct setup_data
(1) For backwards compatibility, if the setup_sects field contains 0, the
real value is 4.
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
covered by setup_move_size, so you may need to adjust this
field.
+Field name: setup_data
+Type: write (obligatory)
+Offset/size: 0x250/8
+Protocol: 2.09+
+
+ The 64-bit physical pointer to NULL terminated single linked list of
+ struct setup_data. This is used to define a more extensible boot
+ parameters passing mechanism. The definition of struct setup_data is
+ as follow:
+
+ struct setup_data {
+ u64 next;
+ u32 type;
+ u32 len;
+ u8 data[0];
+ };
+
+ Where, the next is a 64-bit physical pointer to the next node of
+ linked list, the next field of the last node is 0; the type is used
+ to identify the contents of data; the len is the length of data
+ field; the data holds the real payload.
+
**** MEMORY LAYOUT OF THE REAL-MODE CODE