024ecdd672
Adds a macro to convert a devicetree node to the name of a linker memory region. Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/*
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* Copyright (c) 2021, Commonwealth Scientific and Industrial Research
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* Organisation (CSIRO) ABN 41 687 119 230.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Generate memory regions from devicetree nodes.
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*/
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/**
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* @brief Get the linker memory-region name
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*
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* This attempts to use the zephyr,memory-region property, falling back
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* to the node path if it doesn't exist.
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*
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* Example devicetree fragment:
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*
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* / {
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* soc {
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* sram1: memory@2000000 {
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* zephyr,memory-region = "MY_NAME";
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* };
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* sram2: memory@2001000 { ... };
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* };
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* };
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*
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* Example usage:
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*
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* LINKER_DT_NODE_REGION_NAME(DT_NODELABEL(sram1)) // "MY_NAME"
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* LINKER_DT_NODE_REGION_NAME(DT_NODELABEL(sram2)) // "/soc/memory@2001000"
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*
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* @param node_id node identifier
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* @return the name of the memory memory region the node will generate
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*/
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#define LINKER_DT_NODE_REGION_NAME(node_id) \
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DT_PROP_OR(node_id, zephyr_memory_region, DT_NODE_PATH(node_id))
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/* Declare a memory region */
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#define _REGION_DECLARE(name, attr, node) name(attr) : \
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ORIGIN = DT_REG_ADDR(node), \
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LENGTH = DT_REG_SIZE(node)
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/**
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* @brief Generate a linker memory region from a devicetree node
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*
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* If @p node_id refers to a node with status "okay", then this declares
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* a linker memory region named @p name with attributes from @p attr.
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*
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* Otherwise, it doesn't expand to anything.
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*
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* @param name name of the generated memory region
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* @param attr region attributes to use (rx, rw, ...)
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* @param node_id devicetree node identifier with a \<reg\> property
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* defining region location and size.
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*/
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#define LINKER_DT_REGION_FROM_NODE(name, attr, node_id) \
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COND_CODE_1(DT_NODE_HAS_STATUS(node_id, okay), \
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(_REGION_DECLARE(name, attr, node_id)), \
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())
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