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authorVivek Goyal <vgoyal@in.ibm.com>2006-12-06 20:14:04 -0500
committerAndi Kleen <andi@basil.nowhere.org>2006-12-06 20:14:04 -0500
commitbe274eeaf20b4c7155242645d5e2c48b023e609b (patch)
tree2c56b03d80ad1e9e376b286ddfa28fffe0606901 /Documentation/i386
parente69f202d0a1419219198566e1c22218a5c71a9a6 (diff)
[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>
Diffstat (limited to 'Documentation/i386')
-rw-r--r--Documentation/i386/boot.txt4
1 files changed, 4 insertions, 0 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
35 initrd address available to the bootloader. 35 initrd address available to the bootloader.
36 36
37Protocol 2.04: (Kernel 2.6.14) Extend the syssize field to four bytes. 37Protocol 2.04: (Kernel 2.6.14) Extend the syssize field to four bytes.
38Protocol 2.05: (Kernel 2.6.20) Make protected mode kernel relocatable.
39 Introduce relocatable_kernel and kernel_alignment fields.
38 40
39 41
40**** MEMORY LAYOUT 42**** MEMORY LAYOUT
@@ -129,6 +131,8 @@ Offset Proto Name Meaning
1290226/2 N/A pad1 Unused 1310226/2 N/A pad1 Unused
1300228/4 2.02+ cmd_line_ptr 32-bit pointer to the kernel command line 1320228/4 2.02+ cmd_line_ptr 32-bit pointer to the kernel command line
131022C/4 2.03+ initrd_addr_max Highest legal initrd address 133022C/4 2.03+ initrd_addr_max Highest legal initrd address
1340230/4 2.04+ kernel_alignment Physical addr alignment required for kernel
1350234/1 2.04+ relocatable_kernel Whether kernel is relocatable or not
132 136
133(1) For backwards compatibility, if the setup_sects field contains 0, the 137(1) For backwards compatibility, if the setup_sects field contains 0, the
134 real value is 4. 138 real value is 4.