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linker: macros for memory regions from devicetree

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Adds a public macro for creating memory regions from devicetree nodes.
`DT_REGION_FROM_NODE_STATUS_OKAY` declares the memory regions for
consumption by ld, assuming the node exists and has `status = "okay"`.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
This commit is contained in:
Jordan Yates 2021-04-10 12:43:09 +10:00 • committed by Carles Cufí
commit 3979eda93b
1 changed files with 26 additions and 0 deletions
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26
include/linker/devicetree_regions.h Normal file
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/*
* Copyright (c) 2021, Commonwealth Scientific and Industrial Research
* Organisation (CSIRO) ABN 41 687 119 230.
*
* SPDX-License-Identifier: Apache-2.0
*
* Generate memory regions from devicetree nodes.
*/
/* Declare a memory region */
#define _REGION_DECLARE(name, attr, node) name(attr) : \
ORIGIN = DT_REG_ADDR(node), \
LENGTH = DT_REG_SIZE(node)
/**
* @brief Generate a linker memory region from a devicetree node
*
* @param name name of the generated memory region
* @param attr region attributes to use (rx, rw, ...)
* @param node devicetree node with a <reg> property defining region location
* and size.
*/
#define DT_REGION_FROM_NODE_STATUS_OKAY(name, attr, node) \
COND_CODE_1(DT_NODE_HAS_STATUS(node, okay), \
(_REGION_DECLARE(name, attr, node)), \
())