diff options
| author | Jeenu Viswambharan <jeenu.viswambharan@arm.com> | 2017-01-16 16:52:35 +0000 |
|---|---|---|
| committer | Jeenu Viswambharan <jeenu.viswambharan@arm.com> | 2017-02-14 09:26:11 +0000 |
| commit | c877b414870bb3e421518caf9c7652a9807419b5 (patch) | |
| tree | f7d2837cb46edd4f3578d39985c4d13fa97e419d /Makefile | |
| parent | 4d07e7821e19dc1ebc640f5264c2a769354c8b2d (diff) | |
Introduce locking primitives using CAS instruction
The ARMv8v.1 architecture extension has introduced support for far
atomics, which includes compare-and-swap. Compare and Swap instruction
is only available for AArch64.
Introduce build options to choose the architecture versions to target
ARM Trusted Firmware:
- ARM_ARCH_MAJOR: selects the major version of target ARM
Architecture. Default value is 8.
- ARM_ARCH_MINOR: selects the minor version of target ARM
Architecture. Default value is 0.
When:
(ARM_ARCH_MAJOR > 8) || ((ARM_ARCH_MAJOR == 8) && (ARM_ARCH_MINOR >= 1)),
for AArch64, Compare and Swap instruction is used to implement spin
locks. Otherwise, the implementation falls back to using
load-/store-exclusive instructions.
Update user guide, and introduce a section in Firmware Design guide to
summarize support for features introduced in ARMv8 Architecture
Extensions.
Change-Id: I73096a0039502f7aef9ec6ab3ae36680da033f16
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -397,6 +397,9 @@ $(eval $(call assert_boolean,SPIN_ON_BL1_EXIT)) $(eval $(call assert_boolean,TRUSTED_BOARD_BOOT)) $(eval $(call assert_boolean,USE_COHERENT_MEM)) +$(eval $(call assert_numeric,ARM_ARCH_MAJOR)) +$(eval $(call assert_numeric,ARM_ARCH_MINOR)) + ################################################################################ # Add definitions to the cpp preprocessor based on the current build options. # This is done after including the platform specific makefile to allow the @@ -404,6 +407,8 @@ $(eval $(call assert_boolean,USE_COHERENT_MEM)) ################################################################################ $(eval $(call add_define,ARM_CCI_PRODUCT_ID)) +$(eval $(call add_define,ARM_ARCH_MAJOR)) +$(eval $(call add_define,ARM_ARCH_MINOR)) $(eval $(call add_define,ARM_GIC_ARCH)) $(eval $(call add_define,ASM_ASSERTION)) $(eval $(call add_define,COLD_BOOT_SINGLE_CPU)) |