/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio. This file is part of ChibiOS/RT. ChibiOS/RT is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. ChibiOS/RT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ /** * @file IAR/ARMCMx/chcore_v6m.h * @brief ARMv6-M architecture port macros and structures. * * @addtogroup IAR_ARMCMx_V6M_CORE * @{ */ #ifndef _CHCORE_V6M_H_ #define _CHCORE_V6M_H_ /*===========================================================================*/ /* Port implementation part. */ /*===========================================================================*/ /** * @brief Cortex-Mx exception context. */ struct cmxctx { regarm_t r0; regarm_t r1; regarm_t r2; regarm_t r3; regarm_t r12; regarm_t lr_thd; regarm_t pc; regarm_t xpsr; }; #if !defined(__DOXYGEN__) struct extctx { regarm_t xpsr; regarm_t r12; regarm_t lr; regarm_t r0; regarm_t r1; regarm_t r2; regarm_t r3; regarm_t pc; }; struct intctx { regarm_t r8; regarm_t r9; regarm_t r10; regarm_t r11; regarm_t r4; regarm_t r5; regarm_t r6; regarm_t r7; regarm_t lr; }; #endif /** * @brief Platform dependent part of the @p chThdInit() API. * @details This code usually setup the context switching frame represented * by an @p intctx structure. */ #define SETUP_CONTEXT(workspace, wsize, pf, arg) { \ tp->p_ctx.r13 = (struct intctx *)((uint8_t *)workspace + \ wsize - \ sizeof(struct intctx)); \ tp->p_ctx.r13->r4 = pf; \ tp->p_ctx.r13->r5 = arg; \ tp->p_ctx.r13->lr = _port_thread_start; \ } /** * @brief Stack size for the system idle thread. * @details This size depends on the idle thread implementation, usually * the idle thread should take no more space than those reserved * by @p INT_REQUIRED_STACK. * @note In this port it is set to 8 because the idle thread does have * a stack frame when compiling without optimizations. You may * reduce this value to zero when compiling with optimizations. */ #ifndef IDLE_THREAD_STACK_SIZE #define IDLE_THREAD_STACK_SIZE 8 #endif /** * @brief Per-thread stack overhead for interrupts servicing. * @details This constant is used in the calculation of the correct working * area size. * This value can be zero on those architecture where there is a * separate interrupt stack and the stack space between @p intctx and * @p extctx is known to be zero. * @note In this port it is conservatively set to 16 because the function * @p chSchDoRescheduleI() can have a stack frame, expecially with * compiler optimizations disabled. */ #ifndef INT_REQUIRED_STACK #define INT_REQUIRED_STACK 16 #endif /** * @brief IRQ prologue code. * @details This macro must be inserted at the start of all IRQ handlers * enabled to invoke system APIs. */ #define PORT_IRQ_PROLOGUE() { \ port_lock_from_isr(); \ _port_irq_nesting++; \ port_unlock_from_isr(); \ } /** * @brief IRQ epilogue code. * @details This macro must be inserted at the end of all IRQ handlers * enabled to invoke system APIs. */ #define PORT_IRQ_EPILOGUE() { \ port_lock_from_isr(); \ if ((--_port_irq_nesting == 0) && chSchIsRescRequiredExI()) { \ register struct cmxctx *ctxp; \ \ asm volatile ("mrs %0, PSP" : "=r" (ctxp) : ); \ _port_saved_pc = ctxp->pc; \ ctxp->pc = _port_switch_from_irq; \ return; \ } \ port_unlock_from_isr(); \ } /** * @brief IRQ handler function declaration. * @note @p id can be a function name or a vector number depending on the * port implementation. */ #define PORT_IRQ_HANDLER(id) void id(void) /** * @brief Fast IRQ handler function declaration. * @note @p id can be a function name or a vector number depending on the * port implementation. */ #define PORT_FAST_IRQ_HANDLER(id) void id(void) /** * @brief Port-related initialization code. */ #define port_init() { \ _port_irq_nesting = 0; \ SCB_AIRCR = AIRCR_VECTKEY | AIRCR_PRIGROUP(0); \ NVICSetSystemHandlerPriority(HANDLER_SYSTICK, \ CORTEX_PRIORITY_MASK(CORTEX_PRIORITY_SYSTICK)); \ } /** * @brief Kernel-lock action. * @details Usually this function just disables interrupts but may perform * more actions. */ #define port_lock() asm volatile ("cpsid i" : : : "memory") /** * @brief Kernel-unlock action. * @details Usually this function just disables interrupts but may perform * more actions. */ #define port_unlock() asm volatile ("cpsie i" : : : "memory") /** * @brief Kernel-lock action from an interrupt handler. * @details This function is invoked before invoking I-class APIs from * interrupt handlers. The implementation is architecture dependent, * in its simplest form it is void. * @note Same as @p port_lock() in this port. */ #define port_lock_from_isr() port_lock() /** * @brief Kernel-unlock action from an interrupt handler. * @details This function is invoked after invoking I-class APIs from interrupt * handlers. The implementation is architecture dependent, in its * simplest form it is void. * @note Same as @p port_lock() in this port. */ #define port_unlock_from_isr() port_unlock() /** * @brief Disables all the interrupt sources. */ #define port_disable() asm volatile ("cpsid i" : : : "memory") /** * @brief Disables the interrupt sources below kernel-level priority. */ #define port_suspend() asm volatile ("cpsid i" : : : "memory") /** * @brief Enables all the interrupt sources. */ #define port_enable() asm volatile ("cpsie i" : : : "memory") /** * @brief Enters an architecture-dependent IRQ-waiting mode. * @details The function is meant to return when an interrupt becomes pending. * The simplest implementation is an empty function or macro but this * would not take advantage of architecture-specific power saving * modes. * @note Implemented as an inlined @p WFI instruction. */ #if CORTEX_ENABLE_WFI_IDLE || defined(__DOXYGEN__) #define port_wait_for_interrupt() asm volatile ("wfi" : : : "memory") #else #define port_wait_for_interrupt() #endif #if !defined(__DOXYGEN__) extern regarm_t _port_saved_pc; extern unsigned _port_irq_nesting; #endif #ifdef __cplusplus extern "C" { #endif void port_halt(void); void port_switch(Thread *ntp, Thread *otp); void _port_switch_from_irq(void); void _port_thread_start(void); #ifdef __cplusplus } #endif #endif /* _CHCORE_V6M_H_ */ /** @} */