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reserved-memory: Introduce support for reserved-memory node

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Introduce a set of header files to be able to define and declare
sections and regions in the linker script. Introduce also DT helpers to
retrieve data back.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
This commit is contained in:
Carlo Caione 2021-05-17 17:31:35 +02:00 • committed by Kumar Gala
commit ae2be2db8a
4 changed files with 226 additions and 0 deletions
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59
include/linker/devicetree_reserved.h Normal file
View file

@ -0,0 +1,59 @@
/*
* Copyright (c) 2021, Carlo Caione <ccaione@baylibre.com>
*
* SPDX-License-Identifier: Apache-2.0
*
* Generate memory regions and sections from reserved-memory nodes.
*/
#include <devicetree.h>
/* Reserved memory node */
#define _NODE_RESERVED DT_INST(0, reserved_memory)
/* Unquoted region label */
#define _DT_LABEL_TOKEN(res) DT_STRING_TOKEN(res, label)
/* _start and _end section symbols */
#define _DT_RESERVED_PREFIX(res) UTIL_CAT(__, _DT_LABEL_TOKEN(res))
#define _DT_RESERVED_START(res) UTIL_CAT(_DT_RESERVED_PREFIX(res), _start)
#define _DT_RESERVED_END(res) UTIL_CAT(_DT_RESERVED_PREFIX(res), _end)
/* Declare a reserved memory region */
#define _RESERVED_REGION_DECLARE(res) DT_STRING_TOKEN(res, label) (rw) : \
ORIGIN = DT_REG_ADDR(res), \
LENGTH = DT_REG_SIZE(res)
/* Declare a reserved memory section */
#define _RESERVED_SECTION_DECLARE(res) SECTION_DATA_PROLOGUE(_DT_LABEL_TOKEN(res), ,) \
{ \
_DT_RESERVED_START(res) = .; \
KEEP(*(._DT_LABEL_TOKEN(res))) \
KEEP(*(._DT_LABEL_TOKEN(res).*)) \
_DT_RESERVED_END(res) = \
_DT_RESERVED_START(res) + DT_REG_SIZE(res); \
} GROUP_LINK_IN(_DT_LABEL_TOKEN(res))
/* Declare reserved memory linker symbols */
#define _RESERVED_SYMBOL_DECLARE(res) extern char _DT_RESERVED_START(res)[]; \
extern char _DT_RESERVED_END(res)[];
/* Apply a macro to a reserved memory region */
#define _RESERVED_REGION_APPLY(f) \
COND_CODE_1(IS_ENABLED(UTIL_CAT(_NODE_RESERVED, _EXISTS)), \
(DT_FOREACH_CHILD(_NODE_RESERVED, f)), ())
/**
* @brief Generate region definitions for all the reserved memory regions
*/
#define DT_RESERVED_MEM_REGIONS() _RESERVED_REGION_APPLY(_RESERVED_REGION_DECLARE)
/**
* @brief Generate section definitions for all the reserved memory regions
*/
#define DT_RESERVED_MEM_SECTIONS() _RESERVED_REGION_APPLY(_RESERVED_SECTION_DECLARE)
/**
* @brief Generate linker script symbols for all the reserved memory regions
*/
#define DT_RESERVED_MEM_SYMBOLS() _RESERVED_REGION_APPLY(_RESERVED_SYMBOL_DECLARE)

5
include/linker/linker-defs.h
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@ -33,6 +33,7 @@
#ifdef ZTEST_UNITTEST
#define DT_NODE_HAS_STATUS(node, status) 0
#else
#include <linker/devicetree_reserved.h>
#include <devicetree.h>
#endif
@ -213,6 +214,10 @@ extern char _image_rodata_size[];
extern char _vector_start[];
extern char _vector_end[];
#if DT_NODE_HAS_STATUS(_NODE_RESERVED, okay)
DT_RESERVED_MEM_SYMBOLS()
#endif
#ifdef CONFIG_SW_VECTOR_RELAY
extern char __vector_relay_table[];
#endif