michaelh/zephyr
1
0
Fork 0
Code Releases Activity

arch: arm: introduce/implement API to configure dynamic MPU regions

Browse source 
This commit introduces an ARM API that allows the user to
program a set of dynamic MPU regions at run-time. The API
function is invoked every time the memory map needs to be
re-programmed (for example at thread context-switch). The
functionality is implementated in arm_core_mpu.c.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2018-12-04 16:44:21 +01:00 • committed by Andrew Boie
commit e93b9d59c3
5 changed files with 155 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

25
arch/arm/core/swap_helper.S
View file

@ -182,13 +182,14 @@ _thread_irq_disabled:
vldmia r0, {s16-s31}
#endif
#ifdef CONFIG_MPU_STACK_GUARD
/* r2 contains k_thread */
add r0, r2, #0
push {r2, lr}
blx configure_mpu_stack_guard
pop {r2, lr}
#endif /* CONFIG_MPU_STACK_GUARD */
#if defined (CONFIG_ARM_MPU)
/* Re-program dynamic memory map */
push {r2,lr}
ldr r0, =_kernel
ldr r0, [r0, #_kernel_offset_to_current]
bl _arch_configure_dynamic_mpu_regions
pop {r2,lr}
#endif
#ifdef CONFIG_USERSPACE
/* restore mode */
@ -204,16 +205,6 @@ _thread_irq_disabled:
*/
isb
/* r2 contains k_thread */
add r0, r2, #0
push {r2, lr}
blx configure_mpu_mem_domain
pop {r2, lr}
add r0, r2, #0
push {r2, lr}
blx configure_mpu_user_context
pop {r2, lr}
#endif
/* load callee-saved + psp from thread */