diff options
author | Huang, Ying <ying.huang@intel.com> | 2008-03-28 05:49:50 +0300 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-04-26 23:34:42 +0400 |
commit | fb884381273669fad034538e6cb186678407cf22 (patch) | |
tree | 2f54f6bb709f50da5325e8e3a9e1c52c649deb4d /Documentation | |
parent | c14b2adf19b5d35aff91280b1a73c41a4dcabfe3 (diff) |
x86, boot: Document for linked list of struct setup_data
Documentation for linked list of struct setup_data.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/i386/boot.txt | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/i386/boot.txt b/Documentation/i386/boot.txt index 2eb16100bb3f..0fac3465f2e3 100644 --- a/Documentation/i386/boot.txt +++ b/Documentation/i386/boot.txt @@ -42,6 +42,8 @@ Protocol 2.05: (Kernel 2.6.20) Make protected mode kernel relocatable. Protocol 2.06: (Kernel 2.6.22) Added a field that contains the size of the boot command line +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 +174,8 @@ 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 +576,28 @@ 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 |