289 lines
8.8 KiB
C
289 lines
8.8 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file MSP430/chcore.h
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* @brief MSP430 architecture port macros and structures.
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*
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* @addtogroup MSP430_CORE
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* @{
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*/
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#ifndef _CHCORE_H_
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#define _CHCORE_H_
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#include <iomacros.h>
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#include <msp430/common.h>
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/**
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* @brief Enables the use of a wait state in the idle thread loop.
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*/
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#ifndef ENABLE_WFI_IDLE
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#define ENABLE_WFI_IDLE 0
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#endif
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/**
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* @brief Macro defining the MSP430 architecture.
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*/
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#define CH_ARCHITECTURE_MSP430
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/**
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* @brief Name of the implemented architecture.
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*/
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#define CH_ARCHITECTURE_NAME "MSP430"
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/**
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* @brief Name of the architecture variant (optional).
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*/
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#define CH_CORE_VARIANT_NAME "MSP430"
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/**
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* @brief 16 bits stack and memory alignment enforcement.
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*/
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typedef uint16_t stkalign_t;
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/**
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* @brief Generic MSP430 register.
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*/
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typedef void *regmsp_t;
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#if !defined(__DOXYGEN__)
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/**
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* @brief Interrupt saved context.
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* @details This structure represents the stack frame saved during a
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* preemption-capable interrupt handler.
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*/
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struct extctx {
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regmsp_t r12;
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regmsp_t r13;
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regmsp_t r14;
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regmsp_t r15;
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regmsp_t sr;
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regmsp_t pc;
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};
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#endif
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#if !defined(__DOXYGEN__)
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/**
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* @brief System saved context.
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* @details This structure represents the inner stack frame during a context
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* switching.
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*/
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struct intctx {
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regmsp_t r4;
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regmsp_t r5;
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regmsp_t r6;
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regmsp_t r7;
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regmsp_t r8;
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regmsp_t r9;
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regmsp_t r10;
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regmsp_t r11;
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regmsp_t pc;
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};
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#endif
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#if !defined(__DOXYGEN__)
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/**
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* @brief Platform dependent part of the @p Thread structure.
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* @details This structure usually contains just the saved stack pointer
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* defined as a pointer to a @p intctx structure.
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*/
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struct context {
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struct intctx *sp;
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};
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#endif
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/**
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* @brief Platform dependent part of the @p chThdInit() API.
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* @details This code usually setup the context switching frame represented
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* by an @p intctx structure.
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*/
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#define SETUP_CONTEXT(workspace, wsize, pf, arg) { \
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tp->p_ctx.sp = (struct intctx *)((uint8_t *)workspace + \
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wsize - \
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sizeof(struct intctx)); \
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tp->p_ctx.sp->r10 = pf; \
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tp->p_ctx.sp->r11 = arg; \
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tp->p_ctx.sp->pc = _port_thread_start; \
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}
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/**
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* @brief Stack size for the system idle thread.
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* @details This size depends on the idle thread implementation, usually
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* the idle thread should take no more space than those reserved
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* by @p INT_REQUIRED_STACK.
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*/
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#ifndef IDLE_THREAD_STACK_SIZE
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#define IDLE_THREAD_STACK_SIZE 0
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#endif
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/**
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* @brief Per-thread stack overhead for interrupts servicing.
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* @details This constant is used in the calculation of the correct working
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* area size.
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* This value can be zero on those architecture where there is a
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* separate interrupt stack and the stack space between @p intctx and
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* @p extctx is known to be zero.
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* @note In this port the default is 32 bytes per thread.
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*/
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#ifndef INT_REQUIRED_STACK
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#define INT_REQUIRED_STACK 32
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#endif
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/**
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* @brief Enforces a correct alignment for a stack area size value.
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*/
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#define STACK_ALIGN(n) ((((n) - 1) | (sizeof(stkalign_t) - 1)) + 1)
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/**
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* @brief Computes the thread working area global size.
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*/
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#define THD_WA_SIZE(n) STACK_ALIGN(sizeof(Thread) + \
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sizeof(struct intctx) + \
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sizeof(struct extctx) + \
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(n) + (INT_REQUIRED_STACK))
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/**
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* @brief Static working area allocation.
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* @details This macro is used to allocate a static thread working area
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* aligned as both position and size.
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*/
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#define WORKING_AREA(s, n) stkalign_t s[THD_WA_SIZE(n) / sizeof(stkalign_t)];
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/**
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* @brief IRQ prologue code.
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* @details This macro must be inserted at the start of all IRQ handlers
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* enabled to invoke system APIs.
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*/
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#define PORT_IRQ_PROLOGUE()
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/**
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* @brief IRQ epilogue code.
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* @details This macro must be inserted at the end of all IRQ handlers
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* enabled to invoke system APIs.
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*/
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#define PORT_IRQ_EPILOGUE() { \
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if (chSchIsRescRequiredExI()) \
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chSchDoRescheduleI(); \
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}
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/**
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* @brief IRQ handler function declaration.
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* @note @p id can be a function name or a vector number depending on the
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* port implementation.
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*/
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#define PORT_IRQ_HANDLER(id) interrupt(id) _vect_##id(void)
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/**
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* @brief Port-related initialization code.
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* @note This function is empty in this port.
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*/
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#define port_init()
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/**
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* @brief Kernel-lock action.
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* @details Usually this function just disables interrupts but may perform more
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* actions.
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* @note Implemented as global interrupt disable.
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*/
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#define port_lock() asm volatile ("dint")
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/**
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* @brief Kernel-unlock action.
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* @details Usually this function just disables interrupts but may perform more
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* actions.
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* @note Implemented as global interrupt enable.
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*/
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#define port_unlock() asm volatile ("eint")
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/**
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* @brief Kernel-lock action from an interrupt handler.
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* @details This function is invoked before invoking I-class APIs from
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* interrupt handlers. The implementation is architecture dependent,
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* in its simplest form it is void.
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* @note This function is empty in this port.
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*/
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#define port_lock_from_isr()
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/**
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* @brief Kernel-unlock action from an interrupt handler.
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* @details This function is invoked after invoking I-class APIs from interrupt
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* handlers. The implementation is architecture dependent, in its
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* simplest form it is void.
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* @note This function is empty in this port.
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*/
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#define port_unlock_from_isr()
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/**
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* @brief Disables all the interrupt sources.
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* @note Of course non maskable interrupt sources are not included.
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* @note Implemented as global interrupt disable.
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*/
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#define port_disable() asm volatile ("dint")
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/**
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* @brief Disables the interrupt sources below kernel-level priority.
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* @note Interrupt sources above kernel level remains enabled.
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* @note Same as @p port_disable() in this port, there is no difference
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* between the two states.
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*/
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#define port_suspend() asm volatile ("dint")
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/**
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* @brief Enables all the interrupt sources.
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* @note Implemented as global interrupt enable.
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*/
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#define port_enable() asm volatile ("eint")
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/**
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* @brief Enters an architecture-dependent IRQ-waiting mode.
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* @details The function is meant to return when an interrupt becomes pending.
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* The simplest implementation is an empty function or macro but this
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* would not take advantage of architecture-specific power saving
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* modes.
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* @note This port function is implemented as inlined code for performance
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* reasons.
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* @note The port code does not define a low power mode, this macro has to
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* be defined externally. The default implementation is a "nop", not
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* a real low power mode.
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*/
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#if ENABLE_WFI_IDLE != 0
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#ifndef port_wait_for_interrupt
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#define port_wait_for_interrupt() { \
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asm volatile ("nop"); \
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}
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#endif
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#else
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#define port_wait_for_interrupt()
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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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void port_switch(Thread *ntp, Thread *otp);
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void port_halt(void);
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void _port_thread_start(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CHCORE_H_ */
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/** @} */
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