RTEMS 6.1-rc5
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Data Structures | Macros | Functions
mpu_armv7.h File Reference

This header file provides CMSIS interfaces. More...

Go to the source code of this file.

Data Structures

struct  ARM_MPU_Region_t
 

Macros

#define ARM_MPU_ARMV7_H
 
#define ARM_MPU_REGION_SIZE_32B   ((uint8_t)0x04U)
 
#define ARM_MPU_REGION_SIZE_64B   ((uint8_t)0x05U)
 
#define ARM_MPU_REGION_SIZE_128B   ((uint8_t)0x06U)
 
#define ARM_MPU_REGION_SIZE_256B   ((uint8_t)0x07U)
 
#define ARM_MPU_REGION_SIZE_512B   ((uint8_t)0x08U)
 
#define ARM_MPU_REGION_SIZE_1KB   ((uint8_t)0x09U)
 
#define ARM_MPU_REGION_SIZE_2KB   ((uint8_t)0x0AU)
 
#define ARM_MPU_REGION_SIZE_4KB   ((uint8_t)0x0BU)
 
#define ARM_MPU_REGION_SIZE_8KB   ((uint8_t)0x0CU)
 
#define ARM_MPU_REGION_SIZE_16KB   ((uint8_t)0x0DU)
 
#define ARM_MPU_REGION_SIZE_32KB   ((uint8_t)0x0EU)
 
#define ARM_MPU_REGION_SIZE_64KB   ((uint8_t)0x0FU)
 
#define ARM_MPU_REGION_SIZE_128KB   ((uint8_t)0x10U)
 
#define ARM_MPU_REGION_SIZE_256KB   ((uint8_t)0x11U)
 
#define ARM_MPU_REGION_SIZE_512KB   ((uint8_t)0x12U)
 
#define ARM_MPU_REGION_SIZE_1MB   ((uint8_t)0x13U)
 
#define ARM_MPU_REGION_SIZE_2MB   ((uint8_t)0x14U)
 
#define ARM_MPU_REGION_SIZE_4MB   ((uint8_t)0x15U)
 
#define ARM_MPU_REGION_SIZE_8MB   ((uint8_t)0x16U)
 
#define ARM_MPU_REGION_SIZE_16MB   ((uint8_t)0x17U)
 
#define ARM_MPU_REGION_SIZE_32MB   ((uint8_t)0x18U)
 
#define ARM_MPU_REGION_SIZE_64MB   ((uint8_t)0x19U)
 
#define ARM_MPU_REGION_SIZE_128MB   ((uint8_t)0x1AU)
 
#define ARM_MPU_REGION_SIZE_256MB   ((uint8_t)0x1BU)
 
#define ARM_MPU_REGION_SIZE_512MB   ((uint8_t)0x1CU)
 
#define ARM_MPU_REGION_SIZE_1GB   ((uint8_t)0x1DU)
 
#define ARM_MPU_REGION_SIZE_2GB   ((uint8_t)0x1EU)
 
#define ARM_MPU_REGION_SIZE_4GB   ((uint8_t)0x1FU)
 
#define ARM_MPU_AP_NONE   0U
 
#define ARM_MPU_AP_PRIV   1U
 
#define ARM_MPU_AP_URO   2U
 
#define ARM_MPU_AP_FULL   3U
 
#define ARM_MPU_AP_PRO   5U
 
#define ARM_MPU_AP_RO   6U
 
#define ARM_MPU_RBAR(Region, BaseAddress)
 
#define ARM_MPU_ACCESS_(TypeExtField, IsShareable, IsCacheable, IsBufferable)
 
#define ARM_MPU_RASR_EX(DisableExec, AccessPermission, AccessAttributes, SubRegionDisable, Size)
 
#define ARM_MPU_RASR(DisableExec, AccessPermission, TypeExtField, IsShareable, IsCacheable, IsBufferable, SubRegionDisable, Size)    ARM_MPU_RASR_EX(DisableExec, AccessPermission, ARM_MPU_ACCESS_(TypeExtField, IsShareable, IsCacheable, IsBufferable), SubRegionDisable, Size)
 
#define ARM_MPU_ACCESS_ORDERED   ARM_MPU_ACCESS_(0U, 1U, 0U, 0U)
 
#define ARM_MPU_ACCESS_DEVICE(IsShareable)   ((IsShareable) ? ARM_MPU_ACCESS_(0U, 1U, 0U, 1U) : ARM_MPU_ACCESS_(2U, 0U, 0U, 0U))
 
#define ARM_MPU_ACCESS_NORMAL(OuterCp, InnerCp, IsShareable)   ARM_MPU_ACCESS_((4U | (OuterCp)), IsShareable, ((InnerCp) >> 1U), ((InnerCp) & 1U))
 
#define ARM_MPU_CACHEP_NOCACHE   0U
 
#define ARM_MPU_CACHEP_WB_WRA   1U
 
#define ARM_MPU_CACHEP_WT_NWA   2U
 
#define ARM_MPU_CACHEP_WB_NWA   3U
 

Functions

__STATIC_INLINE void ARM_MPU_Enable (uint32_t MPU_Control)
 
__STATIC_INLINE void ARM_MPU_Disable (void)
 
__STATIC_INLINE void ARM_MPU_ClrRegion (uint32_t rnr)
 
__STATIC_INLINE void ARM_MPU_SetRegion (uint32_t rbar, uint32_t rasr)
 
__STATIC_INLINE void ARM_MPU_SetRegionEx (uint32_t rnr, uint32_t rbar, uint32_t rasr)
 
__STATIC_INLINE void ARM_MPU_OrderedMemcpy (volatile uint32_t *dst, const uint32_t *__RESTRICT src, uint32_t len)
 
__STATIC_INLINE void ARM_MPU_Load (ARM_MPU_Region_t const *table, uint32_t cnt)
 

Detailed Description

This header file provides CMSIS interfaces.

Macro Definition Documentation

◆ ARM_MPU_ACCESS_

#define ARM_MPU_ACCESS_ (   TypeExtField,
  IsShareable,
  IsCacheable,
  IsBufferable 
)
Value:
((((TypeExtField) << MPU_RASR_TEX_Pos) & MPU_RASR_TEX_Msk) | \
(((IsShareable) << MPU_RASR_S_Pos) & MPU_RASR_S_Msk) | \
(((IsCacheable) << MPU_RASR_C_Pos) & MPU_RASR_C_Msk) | \
(((IsBufferable) << MPU_RASR_B_Pos) & MPU_RASR_B_Msk))

MPU Memory Access Attributes

Parameters
TypeExtFieldType extension field, allows you to configure memory access type, for example strongly ordered, peripheral.
IsShareableRegion is shareable between multiple bus masters.
IsCacheableRegion is cacheable, i.e. its value may be kept in cache.
IsBufferableRegion is bufferable, i.e. using write-back caching. Cacheable but non-bufferable regions use write-through policy.

◆ ARM_MPU_ACCESS_DEVICE

#define ARM_MPU_ACCESS_DEVICE (   IsShareable)    ((IsShareable) ? ARM_MPU_ACCESS_(0U, 1U, 0U, 1U) : ARM_MPU_ACCESS_(2U, 0U, 0U, 0U))

MPU Memory Access Attribute for device memory.

  • TEX: 000b (if shareable) or 010b (if non-shareable)
  • Shareable or non-shareable
  • Non-cacheable
  • Bufferable (if shareable) or non-bufferable (if non-shareable)
Parameters
IsShareableConfigures the device memory as shareable or non-shareable.

◆ ARM_MPU_ACCESS_NORMAL

#define ARM_MPU_ACCESS_NORMAL (   OuterCp,
  InnerCp,
  IsShareable 
)    ARM_MPU_ACCESS_((4U | (OuterCp)), IsShareable, ((InnerCp) >> 1U), ((InnerCp) & 1U))

MPU Memory Access Attribute for normal memory.

  • TEX: 1BBb (reflecting outer cacheability rules)
  • Shareable or non-shareable
  • Cacheable or non-cacheable (reflecting inner cacheability rules)
  • Bufferable or non-bufferable (reflecting inner cacheability rules)
Parameters
OuterCpConfigures the outer cache policy.
InnerCpConfigures the inner cache policy.
IsShareableConfigures the memory as shareable or non-shareable.

◆ ARM_MPU_ACCESS_ORDERED

#define ARM_MPU_ACCESS_ORDERED   ARM_MPU_ACCESS_(0U, 1U, 0U, 0U)

MPU Memory Access Attribute for strongly ordered memory.

  • TEX: 000b
  • Shareable
  • Non-cacheable
  • Non-bufferable

◆ ARM_MPU_CACHEP_NOCACHE

#define ARM_MPU_CACHEP_NOCACHE   0U

MPU Memory Access Attribute non-cacheable policy.

◆ ARM_MPU_CACHEP_WB_NWA

#define ARM_MPU_CACHEP_WB_NWA   3U

MPU Memory Access Attribute write-back, no write allocate policy.

◆ ARM_MPU_CACHEP_WB_WRA

#define ARM_MPU_CACHEP_WB_WRA   1U

MPU Memory Access Attribute write-back, write and read allocate policy.

◆ ARM_MPU_CACHEP_WT_NWA

#define ARM_MPU_CACHEP_WT_NWA   2U

MPU Memory Access Attribute write-through, no write allocate policy.

◆ ARM_MPU_RASR

#define ARM_MPU_RASR (   DisableExec,
  AccessPermission,
  TypeExtField,
  IsShareable,
  IsCacheable,
  IsBufferable,
  SubRegionDisable,
  Size 
)     ARM_MPU_RASR_EX(DisableExec, AccessPermission, ARM_MPU_ACCESS_(TypeExtField, IsShareable, IsCacheable, IsBufferable), SubRegionDisable, Size)

MPU Region Attribute and Size Register Value

Parameters
DisableExecInstruction access disable bit, 1= disable instruction fetches.
AccessPermissionData access permissions, allows you to configure read/write access for User and Privileged mode.
TypeExtFieldType extension field, allows you to configure memory access type, for example strongly ordered, peripheral.
IsShareableRegion is shareable between multiple bus masters.
IsCacheableRegion is cacheable, i.e. its value may be kept in cache.
IsBufferableRegion is bufferable, i.e. using write-back caching. Cacheable but non-bufferable regions use write-through policy.
SubRegionDisableSub-region disable field.
SizeRegion size of the region to be configured, for example 4K, 8K.

◆ ARM_MPU_RASR_EX

#define ARM_MPU_RASR_EX (   DisableExec,
  AccessPermission,
  AccessAttributes,
  SubRegionDisable,
  Size 
)
Value:
((((DisableExec) << MPU_RASR_XN_Pos) & MPU_RASR_XN_Msk) | \
(((AccessPermission) << MPU_RASR_AP_Pos) & MPU_RASR_AP_Msk) | \
(((AccessAttributes) & (MPU_RASR_TEX_Msk | MPU_RASR_S_Msk | MPU_RASR_C_Msk | MPU_RASR_B_Msk))) | \
(((SubRegionDisable) << MPU_RASR_SRD_Pos) & MPU_RASR_SRD_Msk) | \
(((Size) << MPU_RASR_SIZE_Pos) & MPU_RASR_SIZE_Msk) | \
(((MPU_RASR_ENABLE_Msk))))

MPU Region Attribute and Size Register Value

Parameters
DisableExecInstruction access disable bit, 1= disable instruction fetches.
AccessPermissionData access permissions, allows you to configure read/write access for User and Privileged mode.
AccessAttributesMemory access attribution, see ARM_MPU_ACCESS_.
SubRegionDisableSub-region disable field.
SizeRegion size of the region to be configured, for example 4K, 8K.

◆ ARM_MPU_RBAR

#define ARM_MPU_RBAR (   Region,
  BaseAddress 
)
Value:
(((BaseAddress) & MPU_RBAR_ADDR_Msk) | \
((Region) & MPU_RBAR_REGION_Msk) | \
(MPU_RBAR_VALID_Msk))

MPU Region Base Address Register Value

Parameters
RegionThe region to be configured, number 0 to 15.
BaseAddressThe base address for the region.

Function Documentation

◆ ARM_MPU_ClrRegion()

__STATIC_INLINE void ARM_MPU_ClrRegion ( uint32_t  rnr)

Clear and disable the given MPU region.

Parameters
rnrRegion number to be cleared.

◆ ARM_MPU_Disable()

__STATIC_INLINE void ARM_MPU_Disable ( void  )

Disable the MPU.

◆ ARM_MPU_Enable()

__STATIC_INLINE void ARM_MPU_Enable ( uint32_t  MPU_Control)

Enable the MPU.

Parameters
MPU_ControlDefault access permissions for unconfigured regions.

◆ ARM_MPU_Load()

__STATIC_INLINE void ARM_MPU_Load ( ARM_MPU_Region_t const *  table,
uint32_t  cnt 
)

Load the given number of MPU regions from a table.

Parameters
tablePointer to the MPU configuration table.
cntAmount of regions to be configured.

◆ ARM_MPU_OrderedMemcpy()

__STATIC_INLINE void ARM_MPU_OrderedMemcpy ( volatile uint32_t *  dst,
const uint32_t *__RESTRICT  src,
uint32_t  len 
)

Memcpy with strictly ordered memory access, e.g. used by code in ARM_MPU_Load().

Parameters
dstDestination data is copied to.
srcSource data is copied from.
lenAmount of data words to be copied.

◆ ARM_MPU_SetRegion()

__STATIC_INLINE void ARM_MPU_SetRegion ( uint32_t  rbar,
uint32_t  rasr 
)

Configure an MPU region.

Parameters
rbarValue for RBAR register.
rasrValue for RASR register.

◆ ARM_MPU_SetRegionEx()

__STATIC_INLINE void ARM_MPU_SetRegionEx ( uint32_t  rnr,
uint32_t  rbar,
uint32_t  rasr 
)

Configure the given MPU region.

Parameters
rnrRegion number to be configured.
rbarValue for RBAR register.
rasrValue for RASR register.