296 lines
11 KiB
Plaintext
296 lines
11 KiB
Plaintext
Architecture-Specific Code
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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Table of Contents
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^^^^^^^^^^^^^^^^^
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o Architecture-Specific Code
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o Summary of Files
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o Supported Architectures
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o Configuring NuttX
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Architecture-Specific Code
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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The NuttX configuration consists of:
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o Processor architecture specific files. These are the files contained
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in the arch/<arch-name>/ directory discussed in this README.
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o Chip/SoC specific files. Each processor processor architecture
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is embedded in chip or System-on-a-Chip (SoC) architecture. The
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full chip architecture includes the processor architecture plus
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chip-specific interrupt logic, general purpose I/O (GIO) logic, and
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specialized, internal peripherals (such as UARTs, USB, etc.).
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These chip-specific files are contained within chip-specific
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sub-directories in the arch/<arch-name>/ directory and are selected
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via the CONFIG_ARCH_name selection
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o Board specific files. In order to be usable, the chip must be
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contained in a board environment. The board configuration defines
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additional properties of the board including such things as
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peripheral LEDs, external peripherals (such as network, USB, etc.).
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These board-specific configuration files can be found in the
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boards/<arch>/<chip>/<board> sub-directories.
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This README will address the processor architecture specific files
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that are contained in the arch/<arch-name>/ directory. The file
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include/nuttx/arch.h identifies all of the APIs that must
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be provided by this architecture specific logic. (It also includes
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arch/<arch-name>/arch.h as described below).
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Directory Structure
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^^^^^^^^^^^^^^^^^^^
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The arch/ directory contains architecture-specific logic. The complete
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board port is defined by the architecture-specific code in this
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directory plus the board-specific configurations in the config/
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subdirectory. Each architecture must provide a subdirectory <arch-name>
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under arch/ with the following characteristics:
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<arch-name>/
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|-- include/
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| |--<chip-name>/
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| | `-- (chip-specific header files)
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| |--<other-chips>/
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| |-- arch.h
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| |-- irq.h
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| `-- types.h
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`-- src/
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|--<chip-name>/
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| `-- (chip-specific source files)
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|--<other-chips>/
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|-- Makefile
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`-- (architecture-specific source files)
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Summary of Files
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^^^^^^^^^^^^^^^^
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include/<chip-name>/
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This sub-directory contains chip-specific header files.
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include/arch.h
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This is a hook for any architecture specific definitions that may
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be needed by the system. It is included by include/nuttx/arch.h
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include/types.h
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This provides architecture/toolchain-specific definitions for
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standard types. This file should typedef:
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_int8_t, _uint8_t, _int16_t, _uint16_t, _int32_t, _uint32_t
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and if the architecture supports 64-bit integers:
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_int24_t, _uint24_t, _int64_t, _uint64_t
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NOTE that these type names have a leading underscore character. This
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file will be included(indirectly) by include/stdint.h and typedef'ed to
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the final name without the underscore character. This roundabout way of
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doings things allows the stdint.h to be removed from the include/
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directory in the event that the user prefers to use the definitions
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provided by their toolchain header files.
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irqstate_t
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Must be defined to the be the size required to hold the interrupt
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enable/disable state.
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This file will be included by include/sys/types.h and be made
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available to all files.
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include/irq.h
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This file needs to define some architecture-specific functions (usually
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inline if the compiler supports inlining) and structures. These include:
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- struct xcptcontext. This structure represents the saved context
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of a thread.
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- irqstate_t up_irq_save(void) -- Used to disable all interrupts.
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- void upirq_restore(irqstate_t flags) -- Used to restore interrupt
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enables to the same state as before up_irq_save was called.
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NOTE: These interfaces are not available to application code but can
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only be used within the operating system code. And, in general,
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these functions should *never* be called directly, not unless you
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know absolutely well what you are doing. Rather you shoudl typically
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use the wrapper functions enter_critical_section() and leave_critical_section()
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as prototyped in include/nuttx/irq.h.
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This file must also define NR_IRQS, the total number of IRQs supported
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by the board.
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src/<chip-name>/
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This sub-directory contains chip-specific source files.
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src/Makefile
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This makefile will be executed to build the targets src/libup.a and
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src/up_head.o. The up_head.o file holds the entry point into the system
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(power-on reset entry point, for example). It will be used in
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the final link with libup.a and other system archives to generate the
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final executable.
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Supported Architectures
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^^^^^^^^^^^^^^^^^^^^^^^
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NOTE: nuttx/Documentation/NuttX.html for current information about the
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state of these MCU ports.
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arch/sim - Linux/Cygwin simulation
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A user-mode port of NuttX to the x86 Linux platform is available.
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The purpose of this port is primarily to support OS feature development.
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This port does not support interrupts or a real timer (and hence no
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round robin scheduler) Otherwise, it is complete.
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arch/arm - ARM-based micro-controllers
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This directory holds common ARM architectures. At present, this includes
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the following subdirectories:
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Architecture Support
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arch/arm/include and arch/arm/src/common
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arch/arm/src/arm and arch/arm/include/arm
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arch/arm/src/armv7-a and arch/arm/include/armv6-m
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arch/arm/src/armv7-a and arch/arm/include/armv7-a
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arch/arm/src/armv7-m and arch/arm/include/armv7-m
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arch/arm/src/armv7-r and arch/arm/include/armv7-r
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MCU support
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arch/arm/include/a1x and arch/arm/src/a1x
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arch/arm/include/am335x and arch/arm/src/am335x
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arch/arm/include/c5471 and arch/arm/src/c5471
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arch/arm/include/dm320 and arch/arm/src/dm320
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arch/arm/include/efm32 and arch/arm/src/efm32
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arch/arm/include/imx1 and arch/arm/src/imx1
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arch/arm/include/imx6 and arch/arm/src/imx6
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arch/arm/include/imx6 and arch/arm/src/imrt
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arch/arm/include/kinetis and arch/arm/src/kinetis
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arch/arm/include/kl and arch/arm/src/kl
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arch/arm/include/lc823450 and arch/arm/src/lc823450
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arch/arm/include/lpc17xx_40xx and arch/arm/src/lpc17xx_40xx
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arch/arm/include/lpc214x and arch/arm/src/lpc214x
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arch/arm/include/lpc2378 and arch/arm/src/lpc2378.
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arch/arm/include/lpc31xx and arch/arm/src/lpc31xx
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arch/arm/include/lpc43xx and arch/arm/src/lpc43xx
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arch/arm/include/lpc43xx and arch/arm/src/lpc54xx
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arch/arm/include/lpc43xx and arch/arm/src/max236xx
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arch/arm/include/moxart and arch/arm/src/moxart
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arch/arm/include/nuc1xx and arch/arm/src/nrf52
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arch/arm/include/nuc1xx and arch/arm/src/nuc1xx
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arch/arm/include/sam34 and arch/arm/src/sam34
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arch/arm/include/sama45 and arch/arm/src/sama5
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arch/arm/include/samd2l2 and arch/arm/src/samd2l2
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arch/arm/include/samd2l2 and arch/arm/src/samd5e5
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arch/arm/include/samv7 and arch/arm/src/samv7
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arch/arm/include/stm32 and arch/arm/src/stm32
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arch/arm/include/stm32f7 and arch/arm/src/stm32f0
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arch/arm/include/stm32f7 and arch/arm/src/stm32f7
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arch/arm/include/stm32l4 and arch/arm/src/stm32h7
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arch/arm/include/stm32l4 and arch/arm/src/stm32l4
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arch/arm/include/str71x and arch/arm/src/str71x
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arch/arm/include/tiva and arch/arm/src/tiva
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arch/arm/include/tms570 and arch/arm/src/tms570
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arch/arm/include/tms570 and arch/arm/src/xmc4
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arch/avr
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This directory is dedicated to ports to the Atmel AVR (8-bit) and AVR32 (32-bit)
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MCU families. STATUS: Under development.
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Architecture Support
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arch/avr/include/avr and arch/avr/src/avr
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arch/avr/include/avr32 and arch/avr/src/avr32
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MCU support
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arch/avr/include/atmega and arch/avr/src/atmega
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arch/avr/include/at90usb and arch/avr/src/at90usb
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arch/avr/include/at32uc3 and arch/avr/src/at32uc3
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arch/hc
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This directory is dedicated to ports to the Freescale HC family.
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arch/arm/include/m9s12 and arch/arm/src/m9s12
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arch/mips
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This directory is dedicated to ports to the MIPS family.
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Architecture Support
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arch/mips/include/mips32 and arch/mips/src/mips32
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MCU support
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arch/mips/include/pic32mx and arch/mips/src/pic32mx
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arch/mips/include/pic32mz and arch/mips/src/pic32mz
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arch/renesas - Support for Renesas and legacy Hitachi microcontrollers.
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This include SuperH and M16C.
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Architecture Support
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arch/renesas/include and arch/renesas/src/common
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MCU support
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arch/renesas/include/m16c and arch/renesas/src/m16c
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arch/renesas/include/sh1 and arch/renesas/src/sh1
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arch/or1k
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This directory is dedicated to ports to OpenRISC architectures.
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arch/or1k/include/mor1k and arch/or1k/src/mor1k
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arch/risc-v
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This directory is dedicated to ports to the RISC-V family.
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Architecture Support
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arch/risc-v/include/rv32im
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MCU support
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arch/risc-v/include/gap8
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arch/risc-v/include/nr5m100
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arch/x86 - Intel x86 architectures
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This directory holds related, 32- and 64-bit architectures from Intel.
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At present, this includes the following subdirectories:
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Architecture Support
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arch/x86/include and arch/x86/src/common
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MCU support
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arch/x86/include/i486 and arch/x86/src/i486
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arch/x86/include/qemu and arch/x86/src/qemu
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arch/xtensa
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Implementations based on the Cadence® Tensilica® Xtensa® processors,
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such as the Xtensa LX6 dataplane processing units (DPUs). At
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present, this includes the following subdirectories:
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Common XTENSA support:
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arch/xtensa/include and arch/xtensa/src/common
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LX6 DPU support:
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arch/xtensa/include/lx6 and arch/xtensa/xtensa/lx6
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Expressif ESP32 implementation of the LX6 DPU:
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arch/xtensa/include/esp32 and arch/xtensa/xtensa/esp32
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arch/z16 - ZiLOG 16-bit processors
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This directory holds related, 16-bit architectures from ZiLOG. At
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present, this includes the following subdirectories:
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Architecture Support
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arch/z16/include and arch/z16/src/common
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MCU support
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arch/z16/include/z16f and arch/z16/src/z16f
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arch/z80 - ZiLOG 8-bit microcontrollers
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This directory holds related, 8-bit architectures from ZiLOG. At
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present, this includes the following subdirectories:
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Architecture Support
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arch/z80/include and arch/z80/src/common
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MCU support
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arch/z80/include/ez80 and arch/z80/src/ez80
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arch/z80/include/z80 and arch/z80/src/z180
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arch/z80/include/z8 and arch/z80/src/z8
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arch/z80/include/z80 and arch/z80/src/z80
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