79939e3279
This adds a new function xtensa_mem_kernel_has_access() to determine if a memory region can be accessed by kernel threads. This allows checking for valid mapped memory before accessing them to avoid relying on page faults to detect invalid access. Also fixed an issue with arch_buffer_validate() on MPU where it may return okay even if the incoming memory region has no corresponding entry in the MPU table. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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* Copyright (c) 2016 Cadence Design Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_ARCH_XTENSA_INCLUDE_XTENSA_INTERNAL_H_
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#define ZEPHYR_ARCH_XTENSA_INCLUDE_XTENSA_INTERNAL_H_
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#include <stdint.h>
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#include <zephyr/arch/xtensa/exception.h>
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#include <zephyr/arch/arch_interface.h>
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/**
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* @ingroup xtensa_internal_apis
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* @{
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*/
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/**
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* @brief Dump and print out the stack frame content.
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*
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* This mainly prints out the registers stashed in the stack frame.
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*
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* @param stack Pointer to stack frame.
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*/
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void xtensa_dump_stack(const void *stack);
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/**
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* @brief Get string description from an exception code.
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*
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* @param cause_code Exception code.
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*
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* @return String description.
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*/
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char *xtensa_exccause(unsigned int cause_code);
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/**
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* @brief Called upon a fatal error.
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*
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* @param reason The reason for the fatal error
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* @param esf Exception context, with details and partial or full register
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* state when the error occurred. May in some cases be NULL.
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*/
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void xtensa_fatal_error(unsigned int reason, const struct arch_esf *esf);
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/**
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* @brief Perform a one-way transition from supervisor to user mode.
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*
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* @see arch_user_mode_enter
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*/
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void xtensa_userspace_enter(k_thread_entry_t user_entry,
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void *p1, void *p2, void *p3,
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uintptr_t stack_end,
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uintptr_t stack_start);
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/**
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* @brief Check if kernel threads have access to a memory region.
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*
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* Given a memory region, return whether the current memory management
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* hardware configuration would allow kernel threads to read/write
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* that region.
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*
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* This is mainly used to make sure kernel has access to avoid relying
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* on page fault to detect invalid mappings.
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*
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* @param addr Start address of the buffer
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* @param size Size of the buffer
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* @param write If non-zero, additionally check if the area is writable.
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* Otherwise, just check if the memory can be read.
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*
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* @return False if the permissions don't match.
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*/
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bool xtensa_mem_kernel_has_access(void *addr, size_t size, int write);
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/**
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* @}
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*/
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#endif /* ZEPHYR_ARCH_XTENSA_INCLUDE_XTENSA_INTERNAL_H_ */
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