diff options
Diffstat (limited to 'Documentation/i386/boot.txt')
| -rw-r--r-- | Documentation/i386/boot.txt | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/Documentation/i386/boot.txt b/Documentation/i386/boot.txt index 2eb1610..95ad15c 100644 --- a/Documentation/i386/boot.txt +++ b/Documentation/i386/boot.txt @@ -40,8 +40,18 @@ Protocol 2.05: (Kernel 2.6.20) Make protected mode kernel relocatable. 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 @@ -172,6 +182,8 @@ Offset Proto Name Meaning 0240/8 2.07+ hardware_subarch_data Subarchitecture-specific data 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. @@ -572,6 +584,28 @@ command line is entered using the following protocol: 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 |