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>
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@ -42,6 +42,8 @@ Protocol 2.05: (Kernel 2.6.20) Make protected mode kernel relocatable.
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Protocol 2.06: (Kernel 2.6.22) Added a field that contains the size of
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the boot command line
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Protocol 2.09: (kernel 2.6.26) Added a field of 64-bit physical
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pointer to single linked list of struct setup_data.
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**** MEMORY LAYOUT
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@ -172,6 +174,8 @@ Offset Proto Name Meaning
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0240/8 2.07+ hardware_subarch_data Subarchitecture-specific data
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0248/4 2.08+ payload_offset Offset of kernel payload
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024C/4 2.08+ payload_length Length of kernel payload
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0250/8 2.09+ setup_data 64-bit physical pointer to linked list
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of struct setup_data
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(1) For backwards compatibility, if the setup_sects field contains 0, the
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real value is 4.
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@ -572,6 +576,28 @@ command line is entered using the following protocol:
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covered by setup_move_size, so you may need to adjust this
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field.
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Field name: setup_data
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Type: write (obligatory)
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Offset/size: 0x250/8
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Protocol: 2.09+
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The 64-bit physical pointer to NULL terminated single linked list of
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struct setup_data. This is used to define a more extensible boot
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parameters passing mechanism. The definition of struct setup_data is
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as follow:
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struct setup_data {
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u64 next;
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u32 type;
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u32 len;
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u8 data[0];
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};
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Where, the next is a 64-bit physical pointer to the next node of
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linked list, the next field of the last node is 0; the type is used
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to identify the contents of data; the len is the length of data
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field; the data holds the real payload.
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**** MEMORY LAYOUT OF THE REAL-MODE CODE
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