What is purgatory?

[wilbur]

mips32 , kexec




mips-setup-simpile.S:


In purgatory code, kexec setuped  boot_note structure for kernel to reboot.It accomplished 

this by copying the "kexec" string address to the end of boot_note struct ,  followed by the commandline

pointer stored behind,  and passed in the address of command_line to second kernel by setting 

the value of a1 register to the address of "kexec" string.



What puzzled me is that,in purgatory code,

why      "lw      t2,12(t4)"     could put t2 with the value of  size of boot_notes?

As I know , t4 is the entry address of kernel , why this code above could get the size of 

boot_notes? how?

Does this mean every kernel of elf format has a head structure of boot_note? 



Thank you 
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