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| author | Vivek Goyal <vgoyal@in.ibm.com> | 2006-12-07 02:14:04 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 02:14:04 +0100 |
| commit | be274eeaf20b4c7155242645d5e2c48b023e609b (patch) | |
| tree | 2c56b03d80ad1e9e376b286ddfa28fffe0606901 | |
| parent | e69f202d0a1419219198566e1c22218a5c71a9a6 (diff) | |
| download | linux-be274eeaf20b4c7155242645d5e2c48b023e609b.tar.bz2 | |
[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>
| -rw-r--r-- | Documentation/i386/boot.txt | 4 | ||||
| -rw-r--r-- | arch/i386/boot/setup.S | 13 |
2 files changed, 16 insertions, 1 deletions
diff --git a/Documentation/i386/boot.txt b/Documentation/i386/boot.txt index c51314b1a463..cb28254f1550 100644 --- a/Documentation/i386/boot.txt +++ b/Documentation/i386/boot.txt @@ -35,6 +35,8 @@ Protocol 2.03: (Kernel 2.4.18-pre1) Explicitly makes the highest possible initrd address available to the bootloader. Protocol 2.04: (Kernel 2.6.14) Extend the syssize field to four bytes. +Protocol 2.05: (Kernel 2.6.20) Make protected mode kernel relocatable. + Introduce relocatable_kernel and kernel_alignment fields. **** MEMORY LAYOUT @@ -129,6 +131,8 @@ Offset Proto Name Meaning 0226/2 N/A pad1 Unused 0228/4 2.02+ cmd_line_ptr 32-bit pointer to the kernel command line 022C/4 2.03+ initrd_addr_max Highest legal initrd address +0230/4 2.04+ kernel_alignment Physical addr alignment required for kernel +0234/1 2.04+ relocatable_kernel Whether kernel is relocatable or not (1) For backwards compatibility, if the setup_sects field contains 0, the real value is 4. diff --git a/arch/i386/boot/setup.S b/arch/i386/boot/setup.S index 9aa8b0518184..06edf1c66242 100644 --- a/arch/i386/boot/setup.S +++ b/arch/i386/boot/setup.S @@ -81,7 +81,7 @@ start: # This is the setup header, and it must start at %cs:2 (old 0x9020:2) .ascii "HdrS" # header signature - .word 0x0204 # header version number (>= 0x0105) + .word 0x0205 # header version number (>= 0x0105) # or else old loadlin-1.5 will fail) realmode_swtch: .word 0, 0 # default_switch, SETUPSEG start_sys_seg: .word SYSSEG @@ -160,6 +160,17 @@ ramdisk_max: .long (-__PAGE_OFFSET-(512 << 20)-1) & 0x7fffffff # The highest safe address for # the contents of an initrd +kernel_alignment: .long CONFIG_PHYSICAL_ALIGN #physical addr alignment + #required for protected mode + #kernel +#ifdef CONFIG_RELOCATABLE +relocatable_kernel: .byte 1 +#else +relocatable_kernel: .byte 0 +#endif +pad2: .byte 0 +pad3: .word 0 + trampoline: call start_of_setup .align 16 # The offset at this point is 0x240 |