Skip to content

ARMV7 MMU : support of the NORMAL and memory-ordered memory type #96575

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Oct 21, 2025
Merged

ARMV7 MMU : support of the NORMAL and memory-ordered memory type #96575

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
db39cc4
arch: arm: mmu: introduce K_MEM_ARM_NORMAL_NC flag
arnopo Sep 25, 2025
9141eec
arch: arm: mmu: allow to select the K_MEM_ARM_NORMAL_NC memory type
arnopo Sep 25, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 3 additions & 0 deletions arch/arm/core/mmu/arm_mmu.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -890,6 +890,9 @@ static int __arch_mem_map(void *virt, uintptr_t phys, size_t size, uint32_t flag

switch (flags & K_MEM_CACHE_MASK) {

case K_MEM_ARM_NORMAL_NC:
conv_flags |= MT_NORMAL;
break;
case K_MEM_CACHE_NONE:
default:
conv_flags |= MT_DEVICE;
Expand Down
17 changes: 17 additions & 0 deletions include/zephyr/arch/arm/mmu/arm_mem.h
View file
Open in desktop
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please update the commit message for arch: arm: mmu: introduce NORMAL and STRONGLY_ORDERED flags - it no longer reflects what the commit does

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Good catch! updated

Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
/*
* Copyright (c) 2025 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_ARCH_ARM_ARM_MEM_H_
#define ZEPHYR_INCLUDE_ARCH_ARM_ARM_MEM_H_

/*
* Define ARM specific memory flags used by k_mem_map_phys_bare()
* followed public definitions in include/kernel/mm.h.
*/

/** ARM Specific flags: normal memory with Non-cacheable */
#define K_MEM_ARM_NORMAL_NC 5

#endif /* ZEPHYR_INCLUDE_ARCH_ARM_ARM_MEM_H_ */
2 changes: 2 additions & 0 deletions include/zephyr/kernel/mm.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@
#include <zephyr/toolchain.h>
#if defined(CONFIG_ARM_MMU) && defined(CONFIG_ARM64)
#include <zephyr/arch/arm64/arm_mem.h>
#elif defined(CONFIG_ARM_AARCH32_MMU)
#include <zephyr/arch/arm/mmu/arm_mem.h>
#endif /* CONFIG_ARM_MMU && CONFIG_ARM64 */

#include <zephyr/kernel/internal/mm.h>
Expand Down