[PATCH rtems 4/9] cpu/armv7m: Add _ARMV7M_MPU_set_region function

[Christian Mauderer]

Make the MPU function defined in the STM32H7 BSP available for all
ARMV7M BSPs.

Update #4180
---
 bsps/arm/stm32h7/start/bspstarthooks.c        | 48 +++----------------
 .../cpu/arm/include/rtems/score/armv7m.h      | 37 ++++++++++++++
 2 files changed, 43 insertions(+), 42 deletions(-)

diff --git a/bsps/arm/stm32h7/start/bspstarthooks.c 
b/bsps/arm/stm32h7/start/bspstarthooks.c
index 565bd6876a..97745f0ee8 100644
--- a/bsps/arm/stm32h7/start/bspstarthooks.c
+++ b/bsps/arm/stm32h7/start/bspstarthooks.c
@@ -83,42 +83,6 @@ static void init_peripheral_clocks(void)
   }
 }
 
-static uint32_t get_region_size(uintptr_t size)
-{
-  if ((size & (size - 1)) == 0) {
-    return ARMV7M_MPU_RASR_SIZE(30 - __builtin_clz(size));
-  } else {
-    return ARMV7M_MPU_RASR_SIZE(31 - __builtin_clz(size));
-  }
-}
-
-static void set_region(
-  volatile ARMV7M_MPU *mpu,
-  uint32_t region,
-  uint32_t rasr,
-  const void *begin,
-  const void *end
-)
-{
-  uintptr_t size;
-  uint32_t rbar;
-
-  RTEMS_OBFUSCATE_VARIABLE(begin);
-  RTEMS_OBFUSCATE_VARIABLE(end);
-  size = (uintptr_t) end - (uintptr_t) begin;
-
-  if ( size > 0 ) {
-    rbar = (uintptr_t) begin | region | ARMV7M_MPU_RBAR_VALID;
-    rasr |= get_region_size(size);
-  } else {
-    rbar = region;
-    rasr = 0;
-  }
-
-  mpu->rbar = rbar;
-  mpu->rasr = rasr;
-}
-
 static void init_mpu(void)
 {
   volatile ARMV7M_MPU *mpu;
@@ -136,7 +100,7 @@ static void init_mpu(void)
     mpu->rasr = 0;
   }
 
-  set_region(
+  _ARMV7M_MPU_set_region(
     mpu,
     0,
     ARMV7M_MPU_RASR_XN
@@ -146,7 +110,7 @@ static void init_mpu(void)
     stm32h7_memory_sram_axi_begin,
     stm32h7_memory_sram_axi_end
   );
-  set_region(
+  _ARMV7M_MPU_set_region(
     mpu,
     1,
     ARMV7M_MPU_RASR_XN
@@ -156,7 +120,7 @@ static void init_mpu(void)
     stm32h7_memory_sdram_1_begin,
     stm32h7_memory_sdram_1_end
   );
-  set_region(
+  _ARMV7M_MPU_set_region(
     mpu,
     2,
     ARMV7M_MPU_RASR_AP(0x5)
@@ -165,7 +129,7 @@ static void init_mpu(void)
     bsp_section_start_begin,
     bsp_section_text_end
   );
-  set_region(
+  _ARMV7M_MPU_set_region(
     mpu,
     3,
     ARMV7M_MPU_RASR_XN
@@ -175,7 +139,7 @@ static void init_mpu(void)
     bsp_section_rodata_begin,
     bsp_section_rodata_end
   );
-  set_region(
+  _ARMV7M_MPU_set_region(
     mpu,
     4,
     ARMV7M_MPU_RASR_XN
@@ -185,7 +149,7 @@ static void init_mpu(void)
     bsp_section_nocache_begin,
     bsp_section_nocachenoload_end
   );
-  set_region(
+  _ARMV7M_MPU_set_region(
     mpu,
     region - 1,
     ARMV7M_MPU_RASR_XN | ARMV7M_MPU_RASR_ENABLE,
diff --git a/cpukit/score/cpu/arm/include/rtems/score/armv7m.h 
b/cpukit/score/cpu/arm/include/rtems/score/armv7m.h
index c701e1037c..cb126a49ba 100644
--- a/cpukit/score/cpu/arm/include/rtems/score/armv7m.h
+++ b/cpukit/score/cpu/arm/include/rtems/score/armv7m.h
@@ -611,6 +611,43 @@ void _ARMV7M_Supervisor_call( void );
 
 void _ARMV7M_Clock_handler( void );
 
+static inline uint32_t _ARMV7M_MPU_get_region_size(uintptr_t size)
+{
+  if ((size & (size - 1)) == 0) {
+    return ARMV7M_MPU_RASR_SIZE(30 - __builtin_clz(size));
+  } else {
+    return ARMV7M_MPU_RASR_SIZE(31 - __builtin_clz(size));
+  }
+}
+
+static inline void _ARMV7M_MPU_set_region(
+  volatile ARMV7M_MPU *mpu,
+  uint32_t region,
+  uint32_t rasr,
+  const void *begin,
+  const void *end
+)
+{
+  uintptr_t size;
+  uint32_t rbar;
+
+  RTEMS_OBFUSCATE_VARIABLE(begin);
+  RTEMS_OBFUSCATE_VARIABLE(end);
+  size = (uintptr_t) end - (uintptr_t) begin;
+
+  if ( size > 0 ) {
+    rbar = (uintptr_t) begin | region | ARMV7M_MPU_RBAR_VALID;
+    rasr |= _ARMV7M_MPU_get_region_size(size);
+  } else {
+    rbar = region;
+    rasr = 0;
+  }
+
+  mpu->rbar = rbar;
+  mpu->rasr = rasr;
+}
+
+
 #endif /* ASM */
 
 #endif /* ARM_MULTILIB_ARCH_V7M */
-- 
2.26.2

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