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arch: arc: add support of mpu v6

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Add support of ARC mpu v6
* minimal region size down to 32 bytes
* maximal region number up to 32
* not support uncacheable region and volatile uncached region
* clean up mpu code for better readablity

Signed-off-by: Yuguo Zou <yuguo.zou@synopsys.com>
This commit is contained in:
Yuguo Zou 2021-08-24 20:42:46 +08:00 • committed by Anas Nashif
commit eb14e21d18
7 changed files with 536 additions and 314 deletions
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9
arch/arc/core/mpu/Kconfig
View file

@ -5,11 +5,12 @@
config ARC_MPU_VER config ARC_MPU_VER
int "ARC MPU version" int "ARC MPU version"
range 2 4 range 2 6
default 2 default 2
help help
ARC MPU has several versions. For MPU v2, the minimum region is 2048 bytes; ARC MPU has several versions. For MPU v2, the minimum region is 2048 bytes;
For MPU v3 and v4, the minimum region is 32 bytes For other versions, the minimum region is 32 bytes; v4 has secure features,
v6 supports up to 32 regions.
config ARC_CORE_MPU config ARC_CORE_MPU
bool "ARC Core MPU functionalities" bool "ARC Core MPU functionalities"
@ -31,8 +32,8 @@ config ARC_MPU
select SRAM_REGION_PERMISSIONS select SRAM_REGION_PERMISSIONS
select ARC_CORE_MPU select ARC_CORE_MPU
select THREAD_STACK_INFO select THREAD_STACK_INFO
select GEN_PRIV_STACKS if ARC_MPU_VER = 2 select GEN_PRIV_STACKS if ARC_MPU_VER != 4
select MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT if ARC_MPU_VER = 2 select MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT if ARC_MPU_VER !=4
select MPU_REQUIRES_NON_OVERLAPPING_REGIONS if ARC_MPU_VER = 4 select MPU_REQUIRES_NON_OVERLAPPING_REGIONS if ARC_MPU_VER = 4
help help
Target has ARC MPU (currently only works for EMSK 2.2/2.3 ARCEM7D) Target has ARC MPU (currently only works for EMSK 2.2/2.3 ARCEM7D)

6
arch/arc/core/mpu/arc_mpu.c
View file

@ -52,8 +52,8 @@ static inline uint32_t get_region_attr_by_type(uint32_t type)
} }
} }
#if CONFIG_ARC_MPU_VER == 2 #if CONFIG_ARC_MPU_VER == 4
#include "arc_mpu_v2_internal.h"
#elif CONFIG_ARC_MPU_VER == 4
#include "arc_mpu_v4_internal.h" #include "arc_mpu_v4_internal.h"
#else
#include "arc_mpu_common_internal.h"
#endif #endif

288
arch/arc/core/mpu/arc_mpu_common_internal.h Normal file
View file

@ -0,0 +1,288 @@
/*
* Copyright (c) 2021 Synopsys.
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_COMMON_INTERNAL_H_
#define ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_COMMON_INTERNAL_H_
#if CONFIG_ARC_MPU_VER == 2 || CONFIG_ARC_MPU_VER == 3
#include "arc_mpu_v2_internal.h"
#elif CONFIG_ARC_MPU_VER == 6
#include "arc_mpu_v6_internal.h"
#else
#error "Unsupported MPU version"
#endif
/**
* @brief configure the base address and size for an MPU region
*
* @param type MPU region type
* @param base base address in RAM
* @param size size of the region
*/
static inline int _mpu_configure(uint8_t type, uint32_t base, uint32_t size)
{
int32_t region_index = get_region_index_by_type(type);
uint32_t region_attr = get_region_attr_by_type(type);
LOG_DBG("Region info: 0x%x 0x%x", base, size);
if (region_attr == 0U || region_index < 0) {
return -EINVAL;
}
/*
* For ARC MPU, MPU regions can be overlapped, smaller
* region index has higher priority.
*/
_region_init(region_index, base, size, region_attr);
return 0;
}
/* ARC Core MPU Driver API Implementation for ARC MP */
/**
* @brief enable the MPU
*/
void arc_core_mpu_enable(void)
{
/* Enable MPU */
z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN,
z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) | AUX_MPU_EN_ENABLE);
}
/**
* @brief disable the MPU
*/
void arc_core_mpu_disable(void)
{
/* Disable MPU */
z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN,
z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) & AUX_MPU_EN_DISABLE);
}
/**
* @brief configure the thread's MPU regions
*
* @param thread the target thread
*/
void arc_core_mpu_configure_thread(struct k_thread *thread)
{
#if defined(CONFIG_USERSPACE)
/* configure stack region of user thread */
if (thread->base.user_options & K_USER) {
LOG_DBG("configure user thread %p's stack", thread);
if (_mpu_configure(THREAD_STACK_USER_REGION,
(uint32_t)thread->stack_info.start,
thread->stack_info.size) < 0) {
LOG_ERR("user thread %p's stack failed", thread);
return;
}
}
LOG_DBG("configure thread %p's domain", thread);
arc_core_mpu_configure_mem_domain(thread);
#endif
}
/**
* @brief configure the default region
*
* @param region_attr region attribute of default region
*/
void arc_core_mpu_default(uint32_t region_attr)
{
uint32_t val = z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) & (~AUX_MPU_RDP_ATTR_MASK);
region_attr &= AUX_MPU_RDP_ATTR_MASK;
z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN, region_attr | val);
}
/**
* @brief configure the MPU region
*
* @param index MPU region index
* @param base base address
* @param region_attr region attribute
*/
int arc_core_mpu_region(uint32_t index, uint32_t base, uint32_t size, uint32_t region_attr)
{
if (index >= get_num_regions()) {
return -EINVAL;
}
region_attr &= AUX_MPU_RDP_ATTR_MASK;
_region_init(index, base, size, region_attr);
return 0;
}
#if defined(CONFIG_USERSPACE)
/**
* @brief configure MPU regions for the memory partitions of the memory domain
*
* @param thread the thread which has memory domain
*/
void arc_core_mpu_configure_mem_domain(struct k_thread *thread)
{
int region_index = get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
uint32_t num_partitions;
struct k_mem_partition *pparts;
struct k_mem_domain *mem_domain = NULL;
if (thread) {
mem_domain = thread->mem_domain_info.mem_domain;
}
if (mem_domain) {
LOG_DBG("configure domain: %p", mem_domain);
num_partitions = mem_domain->num_partitions;
pparts = mem_domain->partitions;
} else {
LOG_DBG("disable domain partition regions");
num_partitions = 0U;
pparts = NULL;
}
for (; region_index >= 0; region_index--) {
if (num_partitions) {
LOG_DBG("set region 0x%x 0x%lx 0x%x",
region_index, pparts->start, pparts->size);
_region_init(region_index, pparts->start, pparts->size, pparts->attr);
num_partitions--;
} else {
/* clear the left mpu entries */
_region_init(region_index, 0, 0, 0);
}
pparts++;
}
}
/**
* @brief remove MPU regions for the memory partitions of the memory domain
*
* @param mem_domain the target memory domain
*/
void arc_core_mpu_remove_mem_domain(struct k_mem_domain *mem_domain)
{
ARG_UNUSED(mem_domain);
int region_index = get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
for (; region_index >= 0; region_index--) {
_region_init(region_index, 0, 0, 0);
}
}
/**
* @brief reset MPU region for a single memory partition
*
* @param domain the target memory domain
* @param partition_id memory partition id
*/
void arc_core_mpu_remove_mem_partition(struct k_mem_domain *domain, uint32_t part_id)
{
ARG_UNUSED(domain);
int region_index = get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
LOG_DBG("disable region 0x%x", region_index + part_id);
/* Disable region */
_region_init(region_index + part_id, 0, 0, 0);
}
/**
* @brief get the maximum number of free regions for memory domain partitions
*/
int arc_core_mpu_get_max_domain_partition_regions(void)
{
return get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION) + 1;
}
/**
* @brief validate the given buffer is user accessible or not
*/
int arc_core_mpu_buffer_validate(void *addr, size_t size, int write)
{
/*
* For ARC MPU, smaller region number takes priority.
* we can stop the iteration immediately once we find the
* matched region that grants permission or denies access.
*
*/
for (int r_index = 0; r_index < get_num_regions(); r_index++) {
if (!_is_enabled_region(r_index) || !_is_in_region(r_index, (uint32_t)addr, size)) {
continue;
}
if (_is_user_accessible_region(r_index, write)) {
return 0;
} else {
return -EPERM;
}
}
return -EPERM;
}
#endif /* CONFIG_USERSPACE */
/* ARC MPU Driver Initial Setup */
/*
* @brief MPU default initialization and configuration
*
* This function provides the default configuration mechanism for the Memory
* Protection Unit (MPU).
*/
static int arc_mpu_init(const struct device *arg)
{
ARG_UNUSED(arg);
uint32_t num_regions = get_num_regions();
if (mpu_config.num_regions > num_regions) {
__ASSERT(0, "Request to configure: %u regions (supported: %u)\n",
mpu_config.num_regions, num_regions);
return -EINVAL;
}
/* Disable MPU */
arc_core_mpu_disable();
/*
* the MPU regions are filled in the reverse order.
* According to ARCv2 ISA, the MPU region with smaller
* index has higher priority. The static background MPU
* regions in mpu_config will be in the bottom. Then
* the special type regions will be above.
*/
int r_index = num_regions - mpu_config.num_regions;
/* clear all the regions first */
for (uint32_t i = 0U; i < r_index; i++) {
_region_init(i, 0, 0, 0);
}
/* configure the static regions */
for (uint32_t i = 0U; i < mpu_config.num_regions; i++) {
_region_init(r_index, mpu_config.mpu_regions[i].base,
mpu_config.mpu_regions[i].size, mpu_config.mpu_regions[i].attr);
r_index++;
}
/* default region: no read, write and execute */
arc_core_mpu_default(0);
/* Enable MPU */
arc_core_mpu_enable();
return 0;
}
SYS_INIT(arc_mpu_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
#endif /* ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_COMMON_INTERNAL_H_ */

338
arch/arc/core/mpu/arc_mpu_v2_internal.h
View file

@ -6,15 +6,36 @@
#ifndef ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V2_INTERNAL_H_ #ifndef ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V2_INTERNAL_H_
#define ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V2_INTERNAL_H_ #define ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V2_INTERNAL_H_
#define AUX_MPU_RDB_VALID_MASK (0x1) #define AUX_MPU_EN_ENABLE BIT(30)
#define AUX_MPU_EN_ENABLE (0x40000000) #define AUX_MPU_EN_DISABLE ~BIT(30)
#define AUX_MPU_EN_DISABLE (0xBFFFFFFF)
#define AUX_MPU_RDP_REGION_SIZE(bits) \ /*
(((bits - 1) & 0x3) | (((bits - 1) & 0x1C) << 7)) * The size of the region is a 5-bit field, the three MSB bits are
* represented in [11:9] and the two LSB bits are represented in [1:0].
* Together these fields specify the size of the region in bytes:
* 00000-00011 Reserved
* 0x4 32 0x5 64 0x6 128 0x7 256
* 0x8 512 0x9 1k 0xA 2K 0xB 4K
* 0xC 8K 0xD 16K 0xE 32K 0xF 64K
* 0x10 128K 0x11 256K 0x12 512K 0x13 1M
* 0x14 2M 0x15 4M 0x16 8M 0x17 16M
* 0x18 32M 0x19 64M 0x1A 128M 0x1B 256M
* 0x1C 512M 0x1D 1G 0x1E 2G 0x1F 4G
*
* Bit ... 12 11 10 9 8 3 2 1 0
* ------+------------+------+---+-----------+
* ... | SIZE[11:9] | ATTR | R | SIZE[1:0] |
* ------+------------+------+---+-----------+
*/
/* arrange size into proper bit field in RDP aux reg*/
#define AUX_MPU_RDP_REGION_SIZE(size) (((size - 1) & BIT_MASK(2)) | \
(((size - 1) & (BIT_MASK(3) << 2)) << 7))
/* recover size from bit fields in RDP aux reg*/
#define AUX_MPU_RDP_SIZE_SHIFT(rdp) ((rdp & BIT_MASK(2)) | (((rdp >> 9) & BIT_MASK(3)) << 2))
#define AUX_MPU_RDP_ATTR_MASK (0x1FC) #define AUX_MPU_RDB_VALID_MASK BIT(0)
#define AUX_MPU_RDP_SIZE_MASK (0xE03) #define AUX_MPU_RDP_ATTR_MASK (BIT_MASK(6) << 3)
#define AUX_MPU_RDP_SIZE_MASK ((BIT_MASK(3) << 9) | BIT_MASK(2))
/* For MPU version 2, the minimum protection region size is 2048 bytes */ /* For MPU version 2, the minimum protection region size is 2048 bytes */
#if CONFIG_ARC_MPU_VER == 2 #if CONFIG_ARC_MPU_VER == 2
@ -39,7 +60,7 @@ static inline void _region_init(uint32_t index, uint32_t region_addr, uint32_t s
bits = ARC_FEATURE_MPU_ALIGNMENT_BITS; bits = ARC_FEATURE_MPU_ALIGNMENT_BITS;
} }
if ((1 << bits) < size) { if (BIT(bits) < size) {
bits++; bits++;
} }
@ -72,8 +93,7 @@ static inline int get_region_index_by_type(uint32_t type)
*/ */
switch (type) { switch (type) {
case THREAD_STACK_USER_REGION: case THREAD_STACK_USER_REGION:
return get_num_regions() - mpu_config.num_regions return get_num_regions() - mpu_config.num_regions - THREAD_STACK_REGION;
- THREAD_STACK_REGION;
case THREAD_STACK_REGION: case THREAD_STACK_REGION:
case THREAD_APP_DATA_REGION: case THREAD_APP_DATA_REGION:
case THREAD_DOMAIN_PARTITION_REGION: case THREAD_DOMAIN_PARTITION_REGION:
@ -110,14 +130,14 @@ static inline bool _is_in_region(uint32_t r_index, uint32_t start, uint32_t size
& (~AUX_MPU_RDB_VALID_MASK); & (~AUX_MPU_RDB_VALID_MASK);
r_size_lshift = z_arc_v2_aux_reg_read(_ARC_V2_MPU_RDP0 + r_index * 2U) r_size_lshift = z_arc_v2_aux_reg_read(_ARC_V2_MPU_RDP0 + r_index * 2U)
& AUX_MPU_RDP_SIZE_MASK; & AUX_MPU_RDP_SIZE_MASK;
r_size_lshift = (r_size_lshift & 0x3) | ((r_size_lshift >> 7) & 0x1C); r_size_lshift = AUX_MPU_RDP_SIZE_SHIFT(r_size_lshift);
r_addr_end = r_addr_start + (1 << (r_size_lshift + 1)); r_addr_end = r_addr_start + (1 << (r_size_lshift + 1));
if (start >= r_addr_start && (start + size) <= r_addr_end) { if (start >= r_addr_start && (start + size) <= r_addr_end) {
return 1; return true;
} }
return 0; return false;
} }
/** /**
@ -140,296 +160,4 @@ static inline bool _is_user_accessible_region(uint32_t r_index, int write)
(AUX_MPU_ATTR_UR | AUX_MPU_ATTR_KR)); (AUX_MPU_ATTR_UR | AUX_MPU_ATTR_KR));
} }
/**
* @brief configure the base address and size for an MPU region
*
* @param type MPU region type
* @param base base address in RAM
* @param size size of the region
*/
static inline int _mpu_configure(uint8_t type, uint32_t base, uint32_t size)
{
int32_t region_index = get_region_index_by_type(type);
uint32_t region_attr = get_region_attr_by_type(type);
LOG_DBG("Region info: 0x%x 0x%x", base, size);
if (region_attr == 0U || region_index < 0) {
return -EINVAL;
}
/*
* For ARC MPU v2, MPU regions can be overlapped, smaller
* region index has higher priority.
*/
_region_init(region_index, base, size, region_attr);
return 0;
}
/* ARC Core MPU Driver API Implementation for ARC MPUv2 */
/**
* @brief enable the MPU
*/
void arc_core_mpu_enable(void)
{
/* Enable MPU */
z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN,
z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) | AUX_MPU_EN_ENABLE);
}
/**
* @brief disable the MPU
*/
void arc_core_mpu_disable(void)
{
/* Disable MPU */
z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN,
z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) & AUX_MPU_EN_DISABLE);
}
/**
* @brief configure the thread's MPU regions
*
* @param thread the target thread
*/
void arc_core_mpu_configure_thread(struct k_thread *thread)
{
#if defined(CONFIG_USERSPACE)
/* configure stack region of user thread */
if (thread->base.user_options & K_USER) {
LOG_DBG("configure user thread %p's stack", thread);
if (_mpu_configure(THREAD_STACK_USER_REGION,
(uint32_t)thread->stack_info.start,
thread->stack_info.size) < 0) {
LOG_ERR("user thread %p's stack failed", thread);
return;
}
}
LOG_DBG("configure thread %p's domain", thread);
arc_core_mpu_configure_mem_domain(thread);
#endif
}
/**
* @brief configure the default region
*
* @param region_attr region attribute of default region
*/
void arc_core_mpu_default(uint32_t region_attr)
{
uint32_t val = z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) &
(~AUX_MPU_RDP_ATTR_MASK);
region_attr &= AUX_MPU_RDP_ATTR_MASK;
z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN, region_attr | val);
}
/**
* @brief configure the MPU region
*
* @param index MPU region index
* @param base base address
* @param region_attr region attribute
*/
int arc_core_mpu_region(uint32_t index, uint32_t base, uint32_t size,
uint32_t region_attr)
{
if (index >= get_num_regions()) {
return -EINVAL;
}
region_attr &= AUX_MPU_RDP_ATTR_MASK;
_region_init(index, base, size, region_attr);
return 0;
}
#if defined(CONFIG_USERSPACE)
/**
* @brief configure MPU regions for the memory partitions of the memory domain
*
* @param thread the thread which has memory domain
*/
void arc_core_mpu_configure_mem_domain(struct k_thread *thread)
{
int region_index =
get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
uint32_t num_partitions;
struct k_mem_partition *pparts;
struct k_mem_domain *mem_domain = NULL;
if (thread) {
mem_domain = thread->mem_domain_info.mem_domain;
}
if (mem_domain) {
LOG_DBG("configure domain: %p", mem_domain);
num_partitions = mem_domain->num_partitions;
pparts = mem_domain->partitions;
} else {
LOG_DBG("disable domain partition regions");
num_partitions = 0U;
pparts = NULL;
}
for (; region_index >= 0; region_index--) {
if (num_partitions) {
LOG_DBG("set region 0x%x 0x%lx 0x%x",
region_index, pparts->start, pparts->size);
_region_init(region_index, pparts->start,
pparts->size, pparts->attr);
num_partitions--;
} else {
/* clear the left mpu entries */
_region_init(region_index, 0, 0, 0);
}
pparts++;
}
}
/**
* @brief remove MPU regions for the memory partitions of the memory domain
*
* @param mem_domain the target memory domain
*/
void arc_core_mpu_remove_mem_domain(struct k_mem_domain *mem_domain)
{
ARG_UNUSED(mem_domain);
int region_index =
get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
for (; region_index >= 0; region_index--) {
_region_init(region_index, 0, 0, 0);
}
}
/**
* @brief reset MPU region for a single memory partition
*
* @param domain the target memory domain
* @param partition_id memory partition id
*/
void arc_core_mpu_remove_mem_partition(struct k_mem_domain *domain,
uint32_t part_id)
{
ARG_UNUSED(domain);
int region_index =
get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
LOG_DBG("disable region 0x%x", region_index + part_id);
/* Disable region */
_region_init(region_index + part_id, 0, 0, 0);
}
/**
* @brief get the maximum number of free regions for memory domain partitions
*/
int arc_core_mpu_get_max_domain_partition_regions(void)
{
return get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION) + 1;
}
/**
* @brief validate the given buffer is user accessible or not
*/
int arc_core_mpu_buffer_validate(void *addr, size_t size, int write)
{
int r_index;
/*
* For ARC MPU v2, smaller region number takes priority.
* we can stop the iteration immediately once we find the
* matched region that grants permission or denies access.
*
*/
for (r_index = 0; r_index < get_num_regions(); r_index++) {
if (!_is_enabled_region(r_index) ||
!_is_in_region(r_index, (uint32_t)addr, size)) {
continue;
}
if (_is_user_accessible_region(r_index, write)) {
return 0;
} else {
return -EPERM;
}
}
return -EPERM;
}
#endif /* CONFIG_USERSPACE */
/* ARC MPU Driver Initial Setup */
/*
* @brief MPU default initialization and configuration
*
* This function provides the default configuration mechanism for the Memory
* Protection Unit (MPU).
*/
static int arc_mpu_init(const struct device *arg)
{
ARG_UNUSED(arg);
uint32_t num_regions;
uint32_t i;
num_regions = get_num_regions();
/* ARC MPU supports up to 16 Regions */
if (mpu_config.num_regions > num_regions) {
__ASSERT(0,
"Request to configure: %u regions (supported: %u)\n",
mpu_config.num_regions, num_regions);
return -EINVAL;
}
/* Disable MPU */
arc_core_mpu_disable();
int r_index;
/*
* the MPU regions are filled in the reverse order.
* According to ARCv2 ISA, the MPU region with smaller
* index has higher priority. The static background MPU
* regions in mpu_config will be in the bottom. Then
* the special type regions will be above.
*
*/
r_index = num_regions - mpu_config.num_regions;
/* clear all the regions first */
for (i = 0U; i < r_index; i++) {
_region_init(i, 0, 0, 0);
}
/* configure the static regions */
for (i = 0U; i < mpu_config.num_regions; i++) {
_region_init(r_index,
mpu_config.mpu_regions[i].base,
mpu_config.mpu_regions[i].size,
mpu_config.mpu_regions[i].attr);
r_index++;
}
/* default region: no read, write and execute */
arc_core_mpu_default(0);
/* Enable MPU */
arc_core_mpu_enable();
return 0;
}
SYS_INIT(arc_mpu_init, PRE_KERNEL_1,
CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
#endif /* ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V2_INTERNAL_H_ */ #endif /* ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V2_INTERNAL_H_ */

205
arch/arc/core/mpu/arc_mpu_v6_internal.h Normal file
View file

@ -0,0 +1,205 @@
/*
* Copyright (c) 2021 Synopsys.
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V6_INTERNAL_H_
#define ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V6_INTERNAL_H_
#define AUX_MPU_EN_BANK_MASK BIT(0)
#define AUX_MPU_EN_IC BIT(12)
#define AUX_MPU_EN_DC BIT(13)
#define AUX_MPU_EN_ENABLE BIT(30)
#define AUX_MPU_EN_DISABLE ~BIT(30)
/*
* The size of the region is a 5-bit field, the three MSB bits are
* represented in [11:9] and the two LSB bits are represented in [1:0].
* Together these fields specify the size of the region in bytes:
* 00000-00011 Reserved
* 0x4 32 0x5 64 0x6 128 0x7 256
* 0x8 512 0x9 1k 0xA 2K 0xB 4K
* 0xC 8K 0xD 16K 0xE 32K 0xF 64K
* 0x10 128K 0x11 256K 0x12 512K 0x13 1M
* 0x14 2M 0x15 4M 0x16 8M 0x17 16M
* 0x18 32M 0x19 64M 0x1A 128M 0x1B 256M
* 0x1C 512M 0x1D 1G 0x1E 2G 0x1F 4G
*
* Bit ... 12 11 10 9 8 3 2 1 0
* ------+------------+------+---+-----------+
* ... | SIZE[11:9] | ATTR | R | SIZE[1:0] |
* ------+------------+------+---+-----------+
*/
/* arrange size into proper bit field in RDP aux reg*/
#define AUX_MPU_RDP_REGION_SIZE(size) (((size - 1) & BIT_MASK(2)) | \
(((size - 1) & (BIT_MASK(3) << 2)) << 7))
/* recover size from bit fields in RDP aux reg*/
#define AUX_MPU_RDP_SIZE_SHIFT(rdp) ((rdp & BIT_MASK(2)) | (((rdp >> 9) & BIT_MASK(3)) << 2))
#define AUX_MPU_RDB_VALID_MASK BIT(0)
#define AUX_MPU_RDP_ATTR_MASK (BIT_MASK(6) << 3)
#define AUX_MPU_RDP_SIZE_MASK ((BIT_MASK(3) << 9) | BIT_MASK(2))
/* Global code cacheability that applies to a region
* 0x0: (Default) Code is cacheable in all levels of the cache hierarchy
* 0x1: Code is not cacheable in any level of the cache hierarchy
*/
#define AUX_MPU_RDB_IC BIT(12)
/* Global data cacheability that applies to a region
* 0x0: (Default) Data is cacheable in all levels of the cache hierarchy
* 0x1: Data is not cacheable in any level of the cache hierarchy
*/
#define AUX_MPU_RDB_DC BIT(13)
/* Define a MPU region as non-volatile
* 0x0: (Default) The memory space for this MPU region is treated as a volatile uncached space.
* 0x1: The memory space for this MPU region is non-volatile
*/
#define AUX_MPU_RDB_NV BIT(14)
/* For MPU version 6, the minimum protection region size is 32 bytes */
#define ARC_FEATURE_MPU_ALIGNMENT_BITS 5
#define ARC_FEATURE_MPU_BANK_SIZE 16
/**
* This internal function select a MPU bank
*/
static inline void _bank_select(uint32_t bank)
{
uint32_t val;
val = z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) & (~AUX_MPU_EN_BANK_MASK);
z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN, val | bank);
}
/**
* This internal function initializes a MPU region
*/
static inline void _region_init(uint32_t index, uint32_t region_addr,
uint32_t size, uint32_t region_attr)
{
uint32_t bank = index / ARC_FEATURE_MPU_BANK_SIZE;
index = (index % ARC_FEATURE_MPU_BANK_SIZE) * 2U;
if (size > 0) {
uint8_t bits = find_msb_set(size) - 1;
if (bits < ARC_FEATURE_MPU_ALIGNMENT_BITS) {
bits = ARC_FEATURE_MPU_ALIGNMENT_BITS;
}
if (BIT(bits) < size) {
bits++;
}
/* Clear size bits and IC, DC bits, and set NV bit
* The default value of NV bit is 0 which means the region is volatile and uncached.
* Setting the NV bit here has no effect on mpu v6 but is for the
* forward compatibility to mpu v7. Currently we do not allow to toggle these bits
* until we implement the control of these region properties
* TODO: support uncacheable regions and volatile uncached regions
*/
region_attr &= ~(AUX_MPU_RDP_SIZE_MASK | AUX_MPU_RDB_IC | AUX_MPU_RDB_DC);
region_attr |= AUX_MPU_RDP_REGION_SIZE(bits) | AUX_MPU_RDB_NV;
region_addr |= AUX_MPU_RDB_VALID_MASK;
} else {
region_addr = 0U;
}
_bank_select(bank);
z_arc_v2_aux_reg_write(_ARC_V2_MPU_RDP0 + index, region_attr);
z_arc_v2_aux_reg_write(_ARC_V2_MPU_RDB0 + index, region_addr);
}
/**
* This internal function is utilized by the MPU driver to parse the intent
* type (i.e. THREAD_STACK_REGION) and return the correct region index.
*/
static inline int get_region_index_by_type(uint32_t type)
{
/*
* The new MPU regions are allocated per type after the statically
* configured regions. The type is one-indexed rather than
* zero-indexed.
*
* For ARC MPU v6, the smaller index has higher priority, so the
* index is allocated in reverse order. Static regions start from
* the biggest index, then thread related regions.
*
*/
switch (type) {
case THREAD_STACK_USER_REGION:
return get_num_regions() - mpu_config.num_regions - THREAD_STACK_REGION;
case THREAD_STACK_REGION:
case THREAD_APP_DATA_REGION:
case THREAD_DOMAIN_PARTITION_REGION:
/*
* Start domain partition region from stack guard region
* since stack guard is not supported.
*/
return get_num_regions() - mpu_config.num_regions - type + 1;
default:
__ASSERT(0, "Unsupported type");
return -EINVAL;
}
}
/**
* This internal function checks if region is enabled or not
*/
static inline bool _is_enabled_region(uint32_t r_index)
{
uint32_t bank = r_index / ARC_FEATURE_MPU_BANK_SIZE;
uint32_t index = (r_index % ARC_FEATURE_MPU_BANK_SIZE) * 2U;
_bank_select(bank);
return ((z_arc_v2_aux_reg_read(_ARC_V2_MPU_RDB0 + index)
& AUX_MPU_RDB_VALID_MASK) == AUX_MPU_RDB_VALID_MASK);
}
/**
* This internal function check if the given buffer in in the region
*/
static inline bool _is_in_region(uint32_t r_index, uint32_t start, uint32_t size)
{
uint32_t r_addr_start;
uint32_t r_addr_end;
uint32_t r_size_lshift;
uint32_t bank = r_index / ARC_FEATURE_MPU_BANK_SIZE;
uint32_t index = (r_index % ARC_FEATURE_MPU_BANK_SIZE) * 2U;
_bank_select(bank);
r_addr_start = z_arc_v2_aux_reg_read(_ARC_V2_MPU_RDB0 + index) & (~AUX_MPU_RDB_VALID_MASK);
r_size_lshift = z_arc_v2_aux_reg_read(_ARC_V2_MPU_RDP0 + index) & AUX_MPU_RDP_SIZE_MASK;
r_size_lshift = AUX_MPU_RDP_SIZE_SHIFT(r_size_lshift);
r_addr_end = r_addr_start + (1 << (r_size_lshift + 1));
if (start >= r_addr_start && (start + size) <= r_addr_end) {
return true;
}
return false;
}
/**
* This internal function check if the region is user accessible or not
*/
static inline bool _is_user_accessible_region(uint32_t r_index, int write)
{
uint32_t r_ap;
uint32_t bank = r_index / ARC_FEATURE_MPU_BANK_SIZE;
uint32_t index = (r_index % ARC_FEATURE_MPU_BANK_SIZE) * 2U;
_bank_select(bank);
r_ap = z_arc_v2_aux_reg_read(_ARC_V2_MPU_RDP0 + index);
r_ap &= AUX_MPU_RDP_ATTR_MASK;
if (write) {
return ((r_ap & (AUX_MPU_ATTR_UW | AUX_MPU_ATTR_KW)) ==
(AUX_MPU_ATTR_UW | AUX_MPU_ATTR_KW));
}
return ((r_ap & (AUX_MPU_ATTR_UR | AUX_MPU_ATTR_KR)) ==
(AUX_MPU_ATTR_UR | AUX_MPU_ATTR_KR));
}
#endif /* ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_V6_INTERNAL_H_ */

2
include/arch/arc/arch.h
View file

@ -66,7 +66,7 @@ extern "C" {
#ifdef CONFIG_ARC_CORE_MPU #ifdef CONFIG_ARC_CORE_MPU
#if CONFIG_ARC_MPU_VER == 2 #if CONFIG_ARC_MPU_VER == 2
#define Z_ARC_MPU_ALIGN 2048 #define Z_ARC_MPU_ALIGN 2048
#elif (CONFIG_ARC_MPU_VER == 3) || (CONFIG_ARC_MPU_VER == 4) #elif (CONFIG_ARC_MPU_VER == 3) || (CONFIG_ARC_MPU_VER == 4) || (CONFIG_ARC_MPU_VER == 6)
#define Z_ARC_MPU_ALIGN 32 #define Z_ARC_MPU_ALIGN 32
#else #else
#error "Unsupported MPU version" #error "Unsupported MPU version"

2
include/arch/arc/v2/linker.ld
View file

@ -30,7 +30,7 @@
#ifdef CONFIG_ARC_MPU_ENABLE #ifdef CONFIG_ARC_MPU_ENABLE
#if CONFIG_ARC_MPU_VER == 2 #if CONFIG_ARC_MPU_VER == 2
#define MPU_MIN_SIZE 2048 #define MPU_MIN_SIZE 2048
#elif (CONFIG_ARC_MPU_VER == 3) || (CONFIG_ARC_MPU_VER == 4) #elif (CONFIG_ARC_MPU_VER == 3) || (CONFIG_ARC_MPU_VER == 4) || (CONFIG_ARC_MPU_VER == 6)
#define MPU_MIN_SIZE 32 #define MPU_MIN_SIZE 32
#endif #endif
#define MPU_MIN_SIZE_ALIGN . = ALIGN(MPU_MIN_SIZE); #define MPU_MIN_SIZE_ALIGN . = ALIGN(MPU_MIN_SIZE);