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arm64: Define stage_entry as weak symbol 

This allows SoCs/CPUs to have custom stage_entry in order to apply any
fixups that need to run before standard cpu reset procedure.

BUG=chrome-os-partner:41877
BRANCH=None
TEST=Compiles successfully

Change-Id: Iaae7636349140664b19e81b0082017b63b13f45b
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 498d04b0e9a3394943f03cad603c30ae8b3805d4
Original-Change-Id: I9a005502d4cfcb76017dcae3a655efc0c8814a93
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/284867
Original-Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/10897
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Furquan Shaikh 2015-07-10 15:25:26 -07:00 committed by Patrick Georgi
parent 8799fde760
commit 6e1dc0cd60
2 changed files with 11 additions and 1 deletions
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4
src/arch/arm64/include/arch/asm.h
View File

@ -41,4 +41,8 @@
*/
#define CPU_RESET_ENTRY(name) ENTRY_WITH_ALIGN(name, 6)
#define ENTRY_WEAK(name) \
ENTRY(name) \
.weak name \
#endif /* __ARM_ARM64_ASM_H */

8
src/arch/arm64/stage_entry.S
View File

@ -228,6 +228,12 @@ CPU_RESET_ENTRY(arm64_cpu_startup_resume)
b arm64_c_environment
ENDPROC(arm64_cpu_startup_resume)
ENTRY(stage_entry)
/*
* stage_entry is defined as a weak symbol to allow SoCs/CPUs to define a custom
* entry point to perform any fixups that need to be done immediately after
* power on reset. In case SoC/CPU does not need any custom-defined entrypoint,
* this weak symbol can be used to jump directly to arm64_cpu_startup.
*/
ENTRY_WEAK(stage_entry)
b arm64_cpu_startup
ENDPROC(stage_entry)