Zephyr API Documentation
4.0.0-rc2
A Scalable Open Source RTOS
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linker-devnull.h
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/*
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* Copyright (c) 2023 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/*
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* DESCRIPTION
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* Platform independent set of macros for creating a memory segment for
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* aggregating data that shall be kept in the elf file but not in the binary.
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*/
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#ifndef ZEPHYR_INCLUDE_LINKER_LINKER_DEVNULL_H_
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#if defined(CONFIG_LINKER_DEVNULL_MEMORY)
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#if defined(CONFIG_XIP)
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#if (!defined(ROM_ADDR) && !defined(ROM_BASE)) || !defined(ROM_SIZE)
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#error "ROM_SIZE, ROM_ADDR or ROM_BASE not defined"
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#endif
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#endif
/* CONFIG_XIP */
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#if (!defined(RAM_ADDR) && !defined(RAM_BASE)) || !defined(RAM_SIZE)
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#error "RAM_SIZE, RAM_ADDR or RAM_BASE not defined"
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#endif
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#if defined(CONFIG_XIP) && !defined(ROM_ADDR)
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#define ROM_ADDR ROM_BASE
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#endif
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#if !defined(RAM_ADDR)
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#define RAM_ADDR RAM_BASE
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#endif
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#define ROM_END_ADDR (ROM_ADDR + ROM_SIZE)
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#define DEVNULL_SIZE CONFIG_LINKER_DEVNULL_MEMORY_SIZE
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#define ROM_DEVNULL_END_ADDR (ROM_END_ADDR + DEVNULL_SIZE)
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#define MAX_ADDR UINT32_MAX
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/* Determine where to put the devnull region. It should be adjacent to the ROM
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* region. If ROM starts after RAM or the distance between ROM and RAM is big
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* enough to fit the devnull region then devnull region is placed just after
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* the ROM region. If it cannot be done then the devnull region is placed before
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* the ROM region. It is possible that the devnull region cannot be placed
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* adjacent to the ROM (e.g. ROM starts at 0 and RAM follows ROM). In that
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* case compilation fails and the devnull region is not supported in that
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* configuration.
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*/
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#if !defined(CONFIG_XIP)
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#if RAM_ADDR >= DEVNULL_SIZE
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#define DEVNULL_ADDR (RAM_ADDR - DEVNULL_SIZE)
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#else
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#define DEVNULL_ADDR (RAM_ADDR + RAM_SIZE)
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#endif
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#else
/* CONFIG_XIP */
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#if ((ROM_ADDR > RAM_ADDR) && ((MAX_ADDR - ROM_END_ADDR) >= DEVNULL_SIZE)) || \
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((ROM_END_ADDR + DEVNULL_SIZE) <= RAM_ADDR)
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#define DEVNULL_ADDR ROM_END_ADDR
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#elif ROM_ADDR > DEVNULL_SIZE
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#define DEVNULL_ADDR (ROM_ADDR - DEVNULL_SIZE)
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#else
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#error "Cannot place devnull segment adjacent to ROM region."
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#endif
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#endif
/* CONFIG_XIP */
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#define DEVNULL_REGION DEVNULL_ROM
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#endif
/* CONFIG_LINKER_DEVNULL_MEMORY */
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#endif
/* ZEPHYR_INCLUDE_LINKER_LINKER_DEVNULL_H_ */
zephyr
linker
linker-devnull.h
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