/**
* @file
*
* @ingroup arm_start
*
* @brief Arm CP15 start.
*/
/*
* Copyright (c) 2013 Hesham AL-Matary.
* Copyright (c) 2009-2019 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <info@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef LIBBSP_ARM_SHARED_ARM_CP15_START_H
#define LIBBSP_ARM_SHARED_ARM_CP15_START_H
#include <libcpu/arm-cp15.h>
#include <bsp/start.h>
#include <bsp/linker-symbols.h>
#include <bspopts.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef struct {
uint32_t begin;
uint32_t end;
uint32_t flags;
} arm_cp15_start_section_config;
#define ARMV7_CP15_START_DEFAULT_SECTIONS \
{ \
.begin = (uint32_t) bsp_section_fast_text_begin, \
.end = (uint32_t) bsp_section_fast_text_end, \
.flags = ARMV7_MMU_CODE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_fast_data_begin, \
.end = (uint32_t) bsp_section_fast_data_end, \
.flags = ARMV7_MMU_DATA_READ_WRITE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_start_begin, \
.end = (uint32_t) bsp_section_start_end, \
.flags = ARMV7_MMU_CODE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_vector_begin, \
.end = (uint32_t) bsp_section_vector_end, \
.flags = ARMV7_MMU_DATA_READ_WRITE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_text_begin, \
.end = (uint32_t) bsp_section_text_end, \
.flags = ARMV7_MMU_CODE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_rodata_begin, \
.end = (uint32_t) bsp_section_rodata_end, \
.flags = ARMV7_MMU_DATA_READ_ONLY_CACHED \
}, { \
.begin = (uint32_t) bsp_section_data_begin, \
.end = (uint32_t) bsp_section_data_end, \
.flags = ARMV7_MMU_DATA_READ_WRITE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_bss_begin, \
.end = (uint32_t) bsp_section_bss_end, \
.flags = ARMV7_MMU_DATA_READ_WRITE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_rtemsstack_begin, \
.end = (uint32_t) bsp_section_rtemsstack_end, \
.flags = ARMV7_MMU_DATA_READ_WRITE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_work_begin, \
.end = (uint32_t) bsp_section_work_end, \
.flags = ARMV7_MMU_DATA_READ_WRITE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_stack_begin, \
.end = (uint32_t) bsp_section_stack_end, \
.flags = ARMV7_MMU_DATA_READ_WRITE_CACHED \
}, { \
.begin = (uint32_t) bsp_section_nocache_begin, \
.end = (uint32_t) bsp_section_nocache_end, \
.flags = ARMV7_MMU_DEVICE \
}, { \
.begin = (uint32_t) bsp_section_nocachenoload_begin, \
.end = (uint32_t) bsp_section_nocachenoload_end, \
.flags = ARMV7_MMU_DEVICE \
}, { \
.begin = (uint32_t) bsp_translation_table_base, \
.end = (uint32_t) bsp_translation_table_end, \
.flags = ARMV7_MMU_DATA_READ_WRITE_CACHED \
}
#define ARMV7_CP15_START_WORKSPACE_ENTRY_INDEX 8
BSP_START_DATA_SECTION extern const arm_cp15_start_section_config
arm_cp15_start_mmu_config_table[];
BSP_START_DATA_SECTION extern const size_t
arm_cp15_start_mmu_config_table_size;
BSP_START_TEXT_SECTION static inline void
arm_cp15_start_set_translation_table_entries(
uint32_t *ttb,
const arm_cp15_start_section_config *config
)
{
if (config->begin != config->end) {
uint32_t i;
uint32_t iend;
uint32_t index_mask;
uint32_t flags;
#ifdef ARM_MMU_USE_SMALL_PAGES
uint32_t *pt;
pt = &ttb[ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT];
i = ARM_MMU_SMALL_PAGE_GET_INDEX(config->begin);
iend = ARM_MMU_SMALL_PAGE_GET_INDEX(ARM_MMU_SMALL_PAGE_MVA_ALIGN_UP(config->end));
index_mask = (1U << (32 - ARM_MMU_SMALL_PAGE_BASE_SHIFT)) - 1U;
flags = ARM_MMU_SECT_FLAGS_TO_SMALL_PAGE(config->flags);
while (i != iend) {
pt[i] = (i << ARM_MMU_SMALL_PAGE_BASE_SHIFT) | flags;
i = (i + 1U) & index_mask;
}
#else
i = ARM_MMU_SECT_GET_INDEX(config->begin);
iend = ARM_MMU_SECT_GET_INDEX(ARM_MMU_SECT_MVA_ALIGN_UP(config->end));
index_mask = (1U << (32 - ARM_MMU_SECT_BASE_SHIFT)) - 1U;
flags = config->flags;
while (i != iend) {
ttb[i] = (i << ARM_MMU_SECT_BASE_SHIFT) | flags;
i = (i + 1U) & index_mask;
}
#endif
}
}
BSP_START_TEXT_SECTION static inline void
arm_cp15_start_setup_translation_table(
uint32_t *ttb,
uint32_t client_domain,
const arm_cp15_start_section_config *config_table,
size_t config_count
)
{
#ifdef ARM_MMU_USE_SMALL_PAGES
uint32_t *pt;
#endif
uint32_t dac;
size_t i;
dac = ARM_CP15_DAC_DOMAIN(client_domain, ARM_CP15_DAC_CLIENT);
arm_cp15_set_domain_access_control(dac);
arm_cp15_set_translation_table_base(ttb);
/* Initialize translation table with invalid entries */
#ifdef ARM_MMU_USE_SMALL_PAGES
pt = &ttb[ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT];
for (i = 0; i < ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT; ++i) {
size_t j;
for (j = 0; j < ARM_MMU_SMALL_PAGE_TABLE_ENTRY_COUNT; ++j) {
pt[j] = 0;
}
ttb[i] = (uint32_t) pt | (client_domain << ARM_MMU_SECT_DOMAIN_SHIFT)
| ARM_MMU_PAGE_TABLE_DEFAULT;
pt += ARM_MMU_SMALL_PAGE_TABLE_ENTRY_COUNT;
}
#else
for (i = 0; i < ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT; ++i) {
ttb[i] = 0;
}
#endif
for (i = 0; i < config_count; ++i) {
arm_cp15_start_set_translation_table_entries(ttb, &config_table [i]);
}
}
BSP_START_TEXT_SECTION static inline void
arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
uint32_t ctrl,
uint32_t *ttb,
uint32_t client_domain,
const arm_cp15_start_section_config *config_table,
size_t config_count
)
{
arm_cp15_start_setup_translation_table(
ttb,
client_domain,
config_table,
config_count
);
/* Enable MMU and cache */
ctrl |= ARM_CP15_CTRL_I | ARM_CP15_CTRL_C | ARM_CP15_CTRL_M;
arm_cp15_set_control(ctrl);
}
BSP_START_TEXT_SECTION static inline uint32_t
arm_cp15_start_setup_mmu_and_cache(uint32_t ctrl_clear, uint32_t ctrl_set)
{
uint32_t ctrl = arm_cp15_get_control();
ctrl &= ~ctrl_clear;
ctrl |= ctrl_set;
arm_cp15_set_control(ctrl);
arm_cp15_tlb_invalidate();
return ctrl;
}
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_SHARED_ARM_CP15_START_H */
