| CMSIS-Core (Cortex-A) CMSIS-Core support for Cortex-A processor-based devices |

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Overview

The CMSIS-Core (Cortex-A) component implements the basic run-time system for a Cortex-A device and gives the user access to the processor core and the device peripherals. In detail it defines:

- Hardware Abstraction Layer (HAL) for Cortex-A processor registers with standardized definitions for the GIC, FPU, MMU, Cache, and core access functions.
- System exception names to interface to system exceptions without having compatibility issues.
- Methods to organize header files that makes it easy to learn new Cortex-A microcontroller products and improve software portability. This includes naming conventions for device-specific interrupts.
- Methods for system initialization to be used by each MCU vendor. For example, the standardized SystemInit() function is essential for configuring the clock system of the device.
- Intrinsic functions used to generate CPU instructions that are not supported by standard C functions.
- A variable to determine the system clock frequency which simplifies the setup of the system timers.

The following sections provide details about the CMSIS-Core (Cortex-A):

- Using CMSIS in Embedded Applications describes the project setup and shows a simple program example.
- CMSIS-Core Device Templates describes the files of the CMSIS-Core (Cortex-A) in detail and explains how to adapt template files provided by Arm to silicon vendor devices.
- MISRA-C Deviations describes the violations to the MISRA standard.
- API Reference describes the features and functions of the Device Header File <Device.h> in detail.
- Data Structures describe the data structures of the Device Header File <Device.h> in detail.

# Access to CMSIS-Core (Cortex-A)

CMSIS-Core is actively maintained in the CMSIS 6 GitHub repository and released as part of the CMSIS Software Pack.

The following directories and files relevant to CMSIS-Core (Cortex-A) are present in the ARM::CMSIS Pack:

Directory | Content
--- | ---
📂 CMSIS | CMSIS Base software components folder
┣ 📂 Documentation/html/Core_A | A local copy of this CMSIS-Core (A) documentation
┗ 📂 Core | CMSIS-Core files
┣ 📂 Include | CMSIS-Core Processor Files.
┗ 📂 a-profile | Header files specific for Arm A-Profile.
┗ 📂 Template | Template Files

# Processor Support

CMSIS supports a selected subset of Cortex-A processors.

Cortex-A Technical Reference Manuals

The following Technical Reference Manuals describe the various Arm Cortex-A processors:

- Cortex-A5 (Armv7-A architecture)
- Cortex-A7 (Armv7-A architecture)
- Cortex-A9 (Armv7-A architecture)

# Tested and Verified Toolchains

The CMSIS-Core Device Templates delivered with this CMSIS-Core release have been tested and verified with the following toolchains:

- Arm Compiler for Embedded 6.22
- IAR C/C++ Compiler for Arm 9.40
- GNU Arm Embedded Toolchain 13.2.1
- LLVM/Clang 18.3.1