mirror of https://gitee.com/openkylin/linux.git
[PATCH] i386: extend bzImage protocol for relocatable protected mode kernel
Extend bzImage protocol to enable bootloaders to load a completely relocatable bzImage. Now protected mode component of kernel is also relocatable and a boot-loader can load the protected mode component at a differnt physical address than 1MB. (If kernel was built with CONFIG_RELOCATABLE) Kexec can make use of it to load this kernel at a different physical address to capture kernel crash dumps. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org>
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@ -35,6 +35,8 @@ Protocol 2.03: (Kernel 2.4.18-pre1) Explicitly makes the highest possible
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initrd address available to the bootloader.
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Protocol 2.04: (Kernel 2.6.14) Extend the syssize field to four bytes.
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Protocol 2.05: (Kernel 2.6.20) Make protected mode kernel relocatable.
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Introduce relocatable_kernel and kernel_alignment fields.
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**** MEMORY LAYOUT
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@ -129,6 +131,8 @@ Offset Proto Name Meaning
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0226/2 N/A pad1 Unused
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0228/4 2.02+ cmd_line_ptr 32-bit pointer to the kernel command line
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022C/4 2.03+ initrd_addr_max Highest legal initrd address
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0230/4 2.04+ kernel_alignment Physical addr alignment required for kernel
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0234/1 2.04+ relocatable_kernel Whether kernel is relocatable or not
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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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@ -81,7 +81,7 @@ start:
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# This is the setup header, and it must start at %cs:2 (old 0x9020:2)
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.ascii "HdrS" # header signature
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.word 0x0204 # header version number (>= 0x0105)
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.word 0x0205 # header version number (>= 0x0105)
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# or else old loadlin-1.5 will fail)
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realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
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start_sys_seg: .word SYSSEG
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@ -160,6 +160,17 @@ ramdisk_max: .long (-__PAGE_OFFSET-(512 << 20)-1) & 0x7fffffff
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# The highest safe address for
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# the contents of an initrd
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kernel_alignment: .long CONFIG_PHYSICAL_ALIGN #physical addr alignment
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#required for protected mode
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#kernel
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#ifdef CONFIG_RELOCATABLE
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relocatable_kernel: .byte 1
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#else
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relocatable_kernel: .byte 0
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#endif
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pad2: .byte 0
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pad3: .word 0
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trampoline: call start_of_setup
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.align 16
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# The offset at this point is 0x240
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