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zephyr/arch/common/nocache.ld

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arch: port nocache linker code to use Cmake function Remove from linker.ld Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
2019-03-20 13:04:45 +01:00
/*
* Copyright (c) 2019 Nordic Semiconductor ASA
* Copyright (c) 2019 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
/* Copied from linker.ld */
/* Non-cached region of RAM */
arch: common: Make nocache region loadable The `nocache` is not loadable, thus data stored therein cannot be initialized by the startup code. This might be needed in special cases. E.g. One might have a buffer which one wants to DMA into, and which is a member of a struct. Other members of the struct one may want to have initialized by the startup code. The buffer thus should be placed in the `nocache` region, but for the other members of the buffer to be initialized by the startup code, the `nocache` region needs to be loadable. Fix it by making the `nocache` region loadable. Adding a KConfig symbol to do this optionally was considered, but deemed unnecessary during the PR. Signed-off-by: Julian Achatzi <mail@achatzi.pro>
2025-03-28 14:55:31 +01:00
SECTION_DATA_PROLOGUE(_NOCACHE_SECTION_NAME,,)
arch: port nocache linker code to use Cmake function Remove from linker.ld Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
2019-03-20 13:04:45 +01:00
{
arm64: add nocache memory segment support In some drivers, noncache memory need to be used for dma coherent memroy, so add nocache memory segment mapping and support for ARM64 platforms. The following variables definition example shows they will use nocache memory allocation: int var1 __nocache; int var2 __attribute__((__section__(".nocache"))); Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
2021-10-15 17:21:32 +08:00
#if defined(CONFIG_MMU)
MMU_ALIGN;
#else
arch: port nocache linker code to use Cmake function Remove from linker.ld Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
2019-03-20 13:04:45 +01:00
MPU_ALIGN(_nocache_ram_size);
arm64: add nocache memory segment support In some drivers, noncache memory need to be used for dma coherent memroy, so add nocache memory segment mapping and support for ARM64 platforms. The following variables definition example shows they will use nocache memory allocation: int var1 __nocache; int var2 __attribute__((__section__(".nocache"))); Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
2021-10-15 17:21:32 +08:00
#endif
arch: port nocache linker code to use Cmake function Remove from linker.ld Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
2019-03-20 13:04:45 +01:00
_nocache_ram_start = .;
*(.nocache)
*(".nocache.*")
cmake: Add support to add symbols to nocache section This PR allows the user to add symbols to the nocache section. The use for this could be as follows zephyr_linker_sources_ifdef(CONFIG_NOCACHE_MEMORY NOCACHE_SECTION nocache.ld ) nocache.ld (as shown below) can define additional symbols to go into the nocache section . = ALIGN(4); KEEP(*(NonCacheable)) Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
2022-08-22 11:05:04 -05:00
#include <snippets-nocache-section.ld>
arm64: add nocache memory segment support In some drivers, noncache memory need to be used for dma coherent memroy, so add nocache memory segment mapping and support for ARM64 platforms. The following variables definition example shows they will use nocache memory allocation: int var1 __nocache; int var2 __attribute__((__section__(".nocache"))); Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
2021-10-15 17:21:32 +08:00
#if defined(CONFIG_MMU)
MMU_ALIGN;
#else
arch: port nocache linker code to use Cmake function Remove from linker.ld Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
2019-03-20 13:04:45 +01:00
MPU_ALIGN(_nocache_ram_size);
arm64: add nocache memory segment support In some drivers, noncache memory need to be used for dma coherent memroy, so add nocache memory segment mapping and support for ARM64 platforms. The following variables definition example shows they will use nocache memory allocation: int var1 __nocache; int var2 __attribute__((__section__(".nocache"))); Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
2021-10-15 17:21:32 +08:00
#endif
arch: port nocache linker code to use Cmake function Remove from linker.ld Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
2019-03-20 13:04:45 +01:00
_nocache_ram_end = .;
arch: common: Make nocache region loadable The `nocache` is not loadable, thus data stored therein cannot be initialized by the startup code. This might be needed in special cases. E.g. One might have a buffer which one wants to DMA into, and which is a member of a struct. Other members of the struct one may want to have initialized by the startup code. The buffer thus should be placed in the `nocache` region, but for the other members of the buffer to be initialized by the startup code, the `nocache` region needs to be loadable. Fix it by making the `nocache` region loadable. Adding a KConfig symbol to do this optionally was considered, but deemed unnecessary during the PR. Signed-off-by: Julian Achatzi <mail@achatzi.pro>
2025-03-28 14:55:31 +01:00
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
arch: port nocache linker code to use Cmake function Remove from linker.ld Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
2019-03-20 13:04:45 +01:00
_nocache_ram_size = _nocache_ram_end - _nocache_ram_start;
arch: common: Make nocache region loadable The `nocache` is not loadable, thus data stored therein cannot be initialized by the startup code. This might be needed in special cases. E.g. One might have a buffer which one wants to DMA into, and which is a member of a struct. Other members of the struct one may want to have initialized by the startup code. The buffer thus should be placed in the `nocache` region, but for the other members of the buffer to be initialized by the startup code, the `nocache` region needs to be loadable. Fix it by making the `nocache` region loadable. Adding a KConfig symbol to do this optionally was considered, but deemed unnecessary during the PR. Signed-off-by: Julian Achatzi <mail@achatzi.pro>
2025-03-28 14:55:31 +01:00
_nocache_load_start = LOADADDR(_NOCACHE_SECTION_NAME);
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