From 3c251af392f2dfeedfe9c4595a8a33188c1d1d14 Mon Sep 17 00:00:00 2001 From: Jeenu Viswambharan Date: Wed, 4 Jan 2017 13:51:42 +0000 Subject: [PATCH] build: Define build option for hardware-assisted coherency The boolean build option HW_ASSISTED_COHERENCY is introduced to enable various optimizations in ARM Trusted Software, when built for such systems. It's set to 0 by default. Change-Id: I638390da6e1718fe024dcf5b402e07084f1eb014 Signed-off-by: Jeenu Viswambharan --- Makefile | 2 ++ docs/user-guide.md | 9 +++++++++ make_helpers/defaults.mk | 4 ++++ 3 files changed, 15 insertions(+) diff --git a/Makefile b/Makefile index 932fb3b54..e00159a30 100644 --- a/Makefile +++ b/Makefile @@ -385,6 +385,7 @@ $(eval $(call assert_boolean,ENABLE_PSCI_STAT)) $(eval $(call assert_boolean,ENABLE_RUNTIME_INSTRUMENTATION)) $(eval $(call assert_boolean,ERROR_DEPRECATED)) $(eval $(call assert_boolean,GENERATE_COT)) +$(eval $(call assert_boolean,HW_ASSISTED_COHERENCY)) $(eval $(call assert_boolean,LOAD_IMAGE_V2)) $(eval $(call assert_boolean,NS_TIMER_SWITCH)) $(eval $(call assert_boolean,PL011_GENERIC_UART)) @@ -419,6 +420,7 @@ $(eval $(call add_define,ENABLE_PMF)) $(eval $(call add_define,ENABLE_PSCI_STAT)) $(eval $(call add_define,ENABLE_RUNTIME_INSTRUMENTATION)) $(eval $(call add_define,ERROR_DEPRECATED)) +$(eval $(call add_define,HW_ASSISTED_COHERENCY)) $(eval $(call add_define,LOAD_IMAGE_V2)) $(eval $(call add_define,LOG_LEVEL)) $(eval $(call add_define,NS_TIMER_SWITCH)) diff --git a/docs/user-guide.md b/docs/user-guide.md index 091aeba04..4ed0e2017 100644 --- a/docs/user-guide.md +++ b/docs/user-guide.md @@ -328,6 +328,15 @@ performed. * `HANDLE_EA_EL3_FIRST`: When defined External Aborts and SError Interrupts will be always trapped in EL3 i.e. in BL31 at runtime. +* `HW_ASSISTED_COHERENCY`: On most ARM systems to-date, platform-specific + software operations are required for CPUs to enter and exit coherency. + However, there exists newer systems where CPUs' entry to and exit from + coherency is managed in hardware. Such systems require software to only + initiate the operations, and the rest is managed in hardware, minimizing + active software management. In such systems, this boolean option enables ARM + Trusted Firmware to carry out build and run-time optimizations during boot + and power management operations. This option defaults to 0. + * `LOAD_IMAGE_V2`: Boolean option to enable support for new version (v2) of image loading, which provides more flexibility and scalability around what images are loaded and executed during boot. Default is 0. diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk index b47ea46e3..de506be5b 100644 --- a/make_helpers/defaults.mk +++ b/make_helpers/defaults.mk @@ -105,6 +105,10 @@ FWU_FIP_NAME := fwu_fip.bin # For Chain of Trust GENERATE_COT := 0 +# Whether system coherency is managed in hardware, without explicit software +# operations. +HW_ASSISTED_COHERENCY := 0 + # Flag to enable new version of image loading LOAD_IMAGE_V2 := 0