334 lines
11 KiB
C
334 lines
11 KiB
C
/*
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* Copyright (c) 2013-2014 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief ARM specific kernel interface header
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*
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* This header contains the ARM specific kernel interface. It is
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* included by the kernel interface architecture-abstraction header
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* (include/arc/cpu.h)
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*/
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#ifndef ZEPHYR_INCLUDE_ARCH_ARM_ARCH_H_
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#define ZEPHYR_INCLUDE_ARCH_ARM_ARCH_H_
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/* Add include for DTS generated information */
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#include <generated_dts_board.h>
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/* ARM GPRs are often designated by two different names */
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#define sys_define_gpr_with_alias(name1, name2) union { u32_t name1, name2; }
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#ifdef CONFIG_CPU_CORTEX_M
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#include <arch/arm/cortex_m/exc.h>
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#include <arch/arm/cortex_m/irq.h>
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#include <arch/arm/cortex_m/error.h>
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#include <arch/arm/cortex_m/misc.h>
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#include <arch/arm/cortex_m/memory_map.h>
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#include <arch/arm/cortex_m/asm_inline.h>
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#include <arch/arm/cortex_m/addr_types.h>
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#include <arch/arm/cortex_m/sys_io.h>
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#include <arch/arm/cortex_m/nmi.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Declare the STACK_ALIGN_SIZE
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*
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* Denotes the required alignment of the stack pointer on public API
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* boundaries
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*
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*/
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#ifdef CONFIG_STACK_ALIGN_DOUBLE_WORD
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#define STACK_ALIGN_SIZE 8
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#else
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#define STACK_ALIGN_SIZE 4
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#endif
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/**
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* @brief Declare a minimum MPU guard alignment and size
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*
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* This specifies the minimum MPU guard alignment/size for the MPU. This
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* will be used to denote the guard section of the stack, if it exists.
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*
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* One key note is that this guard results in extra bytes being added to
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* the stack. APIs which give the stack ptr and stack size will take this
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* guard size into account.
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*
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* Stack is allocated, but initial stack pointer is at the end
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* (highest address). Stack grows down to the actual allocation
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* address (lowest address). Stack guard, if present, will comprise
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* the lowest MPU_GUARD_ALIGN_AND_SIZE bytes of the stack.
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*
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* As the stack grows down, it will reach the end of the stack when it
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* encounters either the stack guard region, or the stack allocation
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* address.
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*
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* ----------------------- <---- Stack allocation address + stack size +
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* | | MPU_GUARD_ALIGN_AND_SIZE
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* | Some thread data | <---- Defined when thread is created
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* | ... |
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* |---------------------| <---- Actual initial stack ptr
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* | Initial Stack Ptr | aligned to STACK_ALIGN_SIZE
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* | ... |
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* | ... |
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* | ... |
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* | ... |
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* | ... |
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* | ... |
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* | ... |
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* | ... |
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* | Stack Ends |
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* |---------------------- <---- Stack Buffer Ptr from API
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* | MPU Guard, |
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* | if present |
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* ----------------------- <---- Stack Allocation address
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*
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*/
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#if defined(CONFIG_MPU_STACK_GUARD)
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#define MPU_GUARD_ALIGN_AND_SIZE 32
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#else
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#define MPU_GUARD_ALIGN_AND_SIZE 0
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#endif
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/**
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* @brief Define alignment of a stack buffer
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*
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* This is used for two different things:
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* 1) Used in checks for stack size to be a multiple of the stack buffer
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* alignment
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* 2) Used to determine the alignment of a stack buffer
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*
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*/
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#if defined(CONFIG_USERSPACE)
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#define STACK_ALIGN 32
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#else
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#define STACK_ALIGN max(STACK_ALIGN_SIZE, MPU_GUARD_ALIGN_AND_SIZE)
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#endif
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/**
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* @brief Calculate power of two ceiling for a buffer size input
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*
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*/
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#define POW2_CEIL(x) ((1 << (31 - __builtin_clz(x))) < x ? \
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1 << (31 - __builtin_clz(x) + 1) : \
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1 << (31 - __builtin_clz(x)))
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/**
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* @brief Declare a toplevel thread stack memory region
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*
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* This declares a region of memory suitable for use as a thread's stack.
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*
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* This is the generic, historical definition. Align to STACK_ALIGN_SIZE and
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* put in * 'noinit' section so that it isn't zeroed at boot
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*
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* The declared symbol will always be a character array which can be passed to
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* k_thread_create, but should otherwise not be manipulated.
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*
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* It is legal to precede this definition with the 'static' keyword.
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*
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* It is NOT legal to take the sizeof(sym) and pass that to the stackSize
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* parameter of k_thread_create(), it may not be the same as the
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* 'size' parameter. Use K_THREAD_STACK_SIZEOF() instead.
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*
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* @param sym Thread stack symbol name
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* @param size Size of the stack memory region
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*/
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#if defined(CONFIG_USERSPACE) && \
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defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
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#define _ARCH_THREAD_STACK_DEFINE(sym, size) \
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struct _k_thread_stack_element __kernel_noinit \
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__aligned(POW2_CEIL(size)) sym[POW2_CEIL(size)]
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#else
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#define _ARCH_THREAD_STACK_DEFINE(sym, size) \
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struct _k_thread_stack_element __kernel_noinit __aligned(STACK_ALIGN) \
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sym[size+MPU_GUARD_ALIGN_AND_SIZE]
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#endif
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/**
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* @brief Calculate size of stacks to be allocated in a stack array
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*
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* This macro calculates the size to be allocated for the stacks
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* inside a stack array. It accepts the indicated "size" as a parameter
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* and if required, pads some extra bytes (e.g. for MPU scenarios). Refer
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* K_THREAD_STACK_ARRAY_DEFINE definition to see how this is used.
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*
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* @param size Size of the stack memory region
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*/
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#if defined(CONFIG_USERSPACE) && \
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defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
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#define _ARCH_THREAD_STACK_LEN(size) (POW2_CEIL(size))
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#else
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#define _ARCH_THREAD_STACK_LEN(size) ((size)+MPU_GUARD_ALIGN_AND_SIZE)
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#endif
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/**
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* @brief Declare a toplevel array of thread stack memory regions
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*
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* Create an array of equally sized stacks. See K_THREAD_STACK_DEFINE
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* definition for additional details and constraints.
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*
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* This is the generic, historical definition. Align to STACK_ALIGN_SIZE and
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* put in * 'noinit' section so that it isn't zeroed at boot
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*
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* @param sym Thread stack symbol name
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* @param nmemb Number of stacks to declare
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* @param size Size of the stack memory region
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*/
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#if defined(CONFIG_USERSPACE) && \
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defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
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#define _ARCH_THREAD_STACK_ARRAY_DEFINE(sym, nmemb, size) \
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struct _k_thread_stack_element __kernel_noinit \
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__aligned(POW2_CEIL(size)) \
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sym[nmemb][_ARCH_THREAD_STACK_LEN(size)]
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#else
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#define _ARCH_THREAD_STACK_ARRAY_DEFINE(sym, nmemb, size) \
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struct _k_thread_stack_element __kernel_noinit \
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__aligned(STACK_ALIGN) \
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sym[nmemb][_ARCH_THREAD_STACK_LEN(size)]
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#endif
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/**
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* @brief Declare an embedded stack memory region
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*
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* Used for stacks embedded within other data structures. Use is highly
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* discouraged but in some cases necessary. For memory protection scenarios,
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* it is very important that any RAM preceding this member not be writable
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* by threads else a stack overflow will lead to silent corruption. In other
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* words, the containing data structure should live in RAM owned by the kernel.
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*
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* @param sym Thread stack symbol name
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* @param size Size of the stack memory region
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*/
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#if defined(CONFIG_USERSPACE) && \
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defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
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#define _ARCH_THREAD_STACK_MEMBER(sym, size) \
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struct _k_thread_stack_element __aligned(POW2_CEIL(size)) \
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sym[POW2_CEIL(size)]
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#else
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#define _ARCH_THREAD_STACK_MEMBER(sym, size) \
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struct _k_thread_stack_element __aligned(STACK_ALIGN) \
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sym[size+MPU_GUARD_ALIGN_AND_SIZE]
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#endif
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/**
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* @brief Return the size in bytes of a stack memory region
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*
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* Convenience macro for passing the desired stack size to k_thread_create()
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* since the underlying implementation may actually create something larger
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* (for instance a guard area).
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*
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* The value returned here is NOT guaranteed to match the 'size' parameter
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* passed to K_THREAD_STACK_DEFINE and related macros.
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*
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* In the case of CONFIG_USERSPACE=y and
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* CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT, the size will be larger than the
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* requested size.
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*
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* In all other configurations, the size will be correct.
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*
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* @param sym Stack memory symbol
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* @return Size of the stack
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*/
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#define _ARCH_THREAD_STACK_SIZEOF(sym) (sizeof(sym) - MPU_GUARD_ALIGN_AND_SIZE)
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/**
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* @brief Get a pointer to the physical stack buffer
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*
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* Convenience macro to get at the real underlying stack buffer used by
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* the CPU. Guaranteed to be a character pointer of size K_THREAD_STACK_SIZEOF.
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* This is really only intended for diagnostic tools which want to examine
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* stack memory contents.
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*
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* @param sym Declared stack symbol name
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* @return The buffer itself, a char *
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*/
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#define _ARCH_THREAD_STACK_BUFFER(sym) \
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((char *)(sym) + MPU_GUARD_ALIGN_AND_SIZE)
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#ifdef CONFIG_USERSPACE
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#ifdef CONFIG_ARM_MPU
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#ifndef _ASMLANGUAGE
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#include <arch/arm/cortex_m/mpu/arm_mpu.h>
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#endif /* _ASMLANGUAGE */
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#define _ARCH_MEM_PARTITION_ALIGN_CHECK(start, size) \
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BUILD_ASSERT_MSG(!(((size) & ((size) - 1))) && (size) >= 32 && \
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!((u32_t)(start) & ((size) - 1)), \
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"the size of the partition must be power of 2" \
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" and greater than or equal to 32." \
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"start address of the partition must align with size.")
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#endif /* CONFIG_ARM_MPU*/
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#ifdef CONFIG_NXP_MPU
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#ifndef _ASMLANGUAGE
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#include <arch/arm/cortex_m/mpu/nxp_mpu.h>
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#define K_MEM_PARTITION_P_NA_U_NA (MPU_REGION_SU)
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#define K_MEM_PARTITION_P_RW_U_RW (MPU_REGION_READ | MPU_REGION_WRITE | \
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MPU_REGION_SU)
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#define K_MEM_PARTITION_P_RW_U_RO (MPU_REGION_READ | MPU_REGION_SU_RW)
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#define K_MEM_PARTITION_P_RW_U_NA (MPU_REGION_SU_RW)
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#define K_MEM_PARTITION_P_RO_U_RO (MPU_REGION_READ | MPU_REGION_SU)
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#define K_MEM_PARTITION_P_RO_U_NA (MPU_REGION_SU_RX)
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/* Execution-allowed attributes */
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#define K_MEM_PARTITION_P_RWX_U_RWX (MPU_REGION_READ | MPU_REGION_WRITE | \
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MPU_REGION_EXEC | MPU_REGION_SU)
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#define K_MEM_PARTITION_P_RWX_U_RX (MPU_REGION_READ | MPU_REGION_EXEC | \
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MPU_REGION_SU_RWX)
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#define K_MEM_PARTITION_P_RX_U_RX (MPU_REGION_READ | MPU_REGION_EXEC | \
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MPU_REGION_SU)
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#define K_MEM_PARTITION_IS_WRITABLE(attr) \
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({ \
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int __is_writable__; \
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switch (attr) { \
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case MPU_REGION_WRITE: \
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case MPU_REGION_SU_RW: \
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__is_writable__ = 1; \
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break; \
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default: \
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__is_writable__ = 0; \
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} \
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__is_writable__; \
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})
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#define K_MEM_PARTITION_IS_EXECUTABLE(attr) \
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({ \
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int __is_executable__; \
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switch (attr) { \
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case MPU_REGION_SU_RX: \
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case MPU_REGION_EXEC: \
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__is_executable__ = 1; \
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break; \
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default: \
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__is_executable__ = 0; \
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} \
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__is_executable__; \
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})
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#endif /* _ASMLANGUAGE */
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#define _ARCH_MEM_PARTITION_ALIGN_CHECK(start, size) \
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BUILD_ASSERT_MSG((size) % 32 == 0 && (size) >= 32 && \
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(u32_t)(start) % 32 == 0, \
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"the size of the partition must align with 32" \
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" and greater than or equal to 32." \
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"start address of the partition must align with 32.")
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#endif /* CONFIG_NXP_MPU */
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#endif /* CONFIG_USERSPACE */
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#ifndef _ASMLANGUAGE
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/* Typedef for the k_mem_partition attribute*/
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typedef u32_t k_mem_partition_attr_t;
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#endif /* _ASMLANGUAGE */
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_INCLUDE_ARCH_ARM_ARCH_H_ */
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