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ARM: add additional table to compressed kernel 

Add an additional extendable table to the compressed kernel so that we
can provide further information to boot loaders regarding the properties
of the image contained within.

This is necessary for correct behaviour of kexec.

Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King 2017-09-21 18:10:19 +01:00
parent 429f7a062e
commit c772568788
2 changed files with 13 additions and 0 deletions
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2
arch/arm/boot/compressed/head.S
View File

@ -143,6 +143,8 @@ start:
.word _magic_start @ absolute load/run zImage address
.word _magic_end @ zImage end address
.word 0x04030201 @ endianness flag
.word 0x45454545 @ another magic number to indicate
.word _magic_table @ additional data table
__EFI_HEADER
1:

11
arch/arm/boot/compressed/vmlinux.lds.S
View File

@ -44,12 +44,22 @@ SECTIONS
*(.glue_7t)
*(.glue_7)
}
.table : ALIGN(4) {
_table_start = .;
LONG(ZIMAGE_MAGIC(2))
LONG(ZIMAGE_MAGIC(0x5a534c4b))
LONG(ZIMAGE_MAGIC(__piggy_size_addr - _start))
LONG(ZIMAGE_MAGIC(_kernel_bss_size))
LONG(0)
_table_end = .;
}
.rodata : {
*(.rodata)
*(.rodata.*)
}
.piggydata : {
*(.piggydata)
__piggy_size_addr = . - 4;
}
. = ALIGN(4);
@ -88,6 +98,7 @@ SECTIONS
_magic_sig = ZIMAGE_MAGIC(0x016f2818);
_magic_start = ZIMAGE_MAGIC(_start);
_magic_end = ZIMAGE_MAGIC(_edata);
_magic_table = ZIMAGE_MAGIC(_table_start - _start);
. = BSS_START;
__bss_start = .;