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xtensa: mpu: make sure write to MPU regions is atomic

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This adds a spinlock to make sure writing to hardware MPU
regions is atomic, and cannot be interrupted until all
regions are written to hardware.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2024-07-12 14:56:43 -07:00 committed by Alberto Escolar
parent 50b07f9480
commit 6bd0dcf920
1 changed files with 8 additions and 0 deletions
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8
arch/xtensa/core/mpu.c
View file

@ -33,6 +33,9 @@ extern char _heap_start[];
/** MPU foreground map for kernel mode. */
static struct xtensa_mpu_map xtensa_mpu_map_fg_kernel;
/** Make sure write to the MPU region is atomic. */
static struct k_spinlock xtensa_mpu_lock;
/*
* Additional information about the MPU maps: foreground and background
* maps.
@ -629,6 +632,9 @@ void xtensa_mpu_map_write(struct xtensa_mpu_map *map)
#endif
{
int entry;
k_spinlock_key_t key;
key = k_spin_lock(&xtensa_mpu_lock);
#ifdef CONFIG_USERSPACE
struct xtensa_mpu_map *map = thread->arch.mpu_map;
@ -652,6 +658,8 @@ void xtensa_mpu_map_write(struct xtensa_mpu_map *map)
__asm__ volatile("wptlb %0, %1\n\t"
: : "a"(map->entries[entry].at), "a"(map->entries[entry].as));
}
k_spin_unlock(&xtensa_mpu_lock, key);
}
/**