Commit 70839d20 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64: Add an option to force run-at-load to test relocation 



This adds a config option that can help exercise the case when
the kernel is not running at PAGE_OFFSET.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Reviewed-by: default avatarBalbir Singh <bsingharora@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 5246adec

arch/powerpc/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -479,6 +479,15 @@ config RELOCATABLE 
	  setting can still be useful to bootwrappers that need to know the

	  load address of the kernel (eg. u-boot/mkimage).



config RELOCATABLE_TEST

	bool "Test relocatable kernel"

	depends on (PPC64 && RELOCATABLE)

	default n

	help

	  This runs the relocatable kernel at the address it was initially

	  loaded at, which tends to be non-zero and therefore test the

	  relocation code.



config CRASH_DUMP

	bool "Build a kdump crash kernel"

	depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)

arch/powerpc/kernel/head_64.S

+8 −1
Original line number Diff line number Diff line
@@ -107,12 +107,19 @@ __secondary_hold_acknowledge: 
	 * crash_kernel region.  The loader is responsible for

	 * observing the alignment requirement.

	 */



#ifdef CONFIG_RELOCATABLE_TEST

#define RUN_AT_LOAD_DEFAULT 1		/* Test relocation, do not copy to 0 */

#else

#define RUN_AT_LOAD_DEFAULT 0x72756e30  /* "run0" -- relocate to 0 by default */

#endif



	/* Do not move this variable as kexec-tools knows about it. */

	. = 0x5c

	.globl	__run_at_load

__run_at_load:

DEFINE_FIXED_SYMBOL(__run_at_load)

	.long	0x72756e30	/* "run0" -- relocate to 0 by default */

	.long	RUN_AT_LOAD_DEFAULT

#endif



	. = 0x60

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