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arch: arm: cortex_m: Add CPU DWT feature symbol

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This commit adds a Kconfig symbol for specifying whether the SoC
implements the CPU DWT feature.

The Data Watchpoint and Trace (DWT) is an optional debug unit for the
Cortex-M family cores (except ARMv6-M; i.e. M0 and M0+) that provides
watchpoints, data tracing and system profiling capabilities.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2020-01-02 10:08:46 +09:00 • committed by Ioannis Glaropoulos
commit c4e6bd2d7c
1 changed files with 11 additions and 0 deletions
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11
arch/arm/core/aarch32/cortex_m/Kconfig
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@ -70,6 +70,17 @@ config CPU_CORTEX_M_HAS_SYSTICK
help help
This option is enabled when the CPU implements the SysTick timer. This option is enabled when the CPU implements the SysTick timer.
config CPU_CORTEX_M_HAS_DWT
bool
depends on !CPU_CORTEX_M0 && !CPU_CORTEX_M0PLUS
help
This option signifies that the CPU implements the Data Watchpoint and
Trace (DWT) unit specified by the ARMv7-M and above.
While ARMv6-M does define a "DWT" unit, this is significantly different
from the DWT specified by the ARMv7-M and above in terms of both feature
set and register mappings.
config CPU_CORTEX_M_HAS_BASEPRI config CPU_CORTEX_M_HAS_BASEPRI
bool bool
depends on ARMV7_M_ARMV8_M_MAINLINE depends on ARMV7_M_ARMV8_M_MAINLINE