This adds a config option that can help exercise the case when
the kernel is not running at PAGE_OFFSET.
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
Changes since v1:
- Improved style as suggested by Balbir and Michael
arch/powerpc/Kconfig | 9 +++++++++
arch/powerpc/kernel/head_64.S | 8 +++++++-
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 65fba4c..5d43cb8 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -478,6 +478,15 @@ 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)
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 79da0641..a0aaced 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -107,11 +107,17 @@ __secondary_hold_acknowledge:
* observing the alignment requirement.
*/
/* Do not move this variable as kexec-tools knows about it. */
+#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
+
. = 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
--
2.9.3
