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| 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 /make_helpers/build_macros.mk | |
| 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 'make_helpers/build_macros.mk')
| -rw-r--r-- | make_helpers/build_macros.mk | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk index 2312d2c9..93db2d66 100644 --- a/make_helpers/build_macros.mk +++ b/make_helpers/build_macros.mk @@ -1,5 +1,5 @@ # -# Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved. +# Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are met: @@ -81,6 +81,16 @@ define assert_boolean $(and $(patsubst 0,,$(value $(1))),$(patsubst 1,,$(value $(1))),$(error $(1) must be boolean)) endef +0-9 := 0 1 2 3 4 5 6 7 8 9 + +# Function to verify that a given option $(1) contains a numeric value +define assert_numeric +$(if $($(1)),,$(error $(1) must not be empty)) +$(eval __numeric := $($(1))) +$(foreach d,$(0-9),$(eval __numeric := $(subst $(d),,$(__numeric)))) +$(if $(__numeric),$(error $(1) must be numeric)) +endef + # IMG_LINKERFILE defines the linker script corresponding to a BL stage # $(1) = BL stage (2, 30, 31, 32, 33) define IMG_LINKERFILE |