236 lines
6.4 KiB
C
236 lines
6.4 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2007 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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* @addtogroup AVR_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 <avr/io.h>
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#include <avr/interrupt.h>
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/*
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* Port-related configuration parameters.
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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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* Macro defining the AVR architecture.
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*/
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#define CH_ARCHITECTURE_AVR
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/**
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* 8 bit stack alignment.
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*/
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typedef uint8_t stkalign_t;
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/**
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* Interrupt saved context.
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* @note The field @p _next is not part of the context, it represents the
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* offset of the structure relative to the stack pointer.
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*/
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struct extctx {
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uint8_t _next;
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uint8_t r31;
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uint8_t r30;
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uint8_t r27;
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uint8_t r26;
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uint8_t r25;
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uint8_t r24;
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uint8_t r23;
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uint8_t r22;
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uint8_t r21;
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uint8_t r20;
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uint8_t r19;
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uint8_t r18;
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uint8_t sr;
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uint8_t r1;
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uint8_t r0;
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uint16_t pc;
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};
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/**
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* System saved context.
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* @note The field @p _next is not part of the context, it represents the
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* offset of the structure relative to the stack pointer.
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*/
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struct intctx {
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uint8_t _next;
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uint8_t r29;
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uint8_t r28;
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uint8_t r17;
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uint8_t r16;
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uint8_t r15;
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uint8_t r14;
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uint8_t r13;
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uint8_t r12;
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uint8_t r11;
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uint8_t r10;
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#ifndef CH_CURRP_REGISTER_CACHE
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uint8_t r9;
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uint8_t r8;
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#endif
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uint8_t r7;
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uint8_t r6;
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uint8_t r5;
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uint8_t r4;
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uint8_t r3;
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uint8_t r2;
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uint8_t pcl;
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uint8_t pch;
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};
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/**
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* Platform dependent part of the @p Thread structure.
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* In the AVR port this structure just holds a pointer to the @p intctx
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* structure representing the stack pointer at the time of the context switch.
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*/
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typedef struct {
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struct intctx *sp;
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} Context;
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/**
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* Platform dependent part of the @p chThdInit() API.
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* This code usually setup the context switching frame represented by a
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* @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 + wsize - \
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sizeof(struct intctx)); \
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tp->p_ctx.sp->r2 = (int)pf; \
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tp->p_ctx.sp->r3 = (int)pf >> 8; \
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tp->p_ctx.sp->r4 = (int)arg; \
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tp->p_ctx.sp->r5 = (int)arg >> 8; \
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tp->p_ctx.sp->pcl = (int)threadstart >> 8; \
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tp->p_ctx.sp->pch = (int)threadstart; \
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}
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/**
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* The default idle thread implementation requires no extra stack space in
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* this port.
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*/
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#ifndef IDLE_THREAD_STACK_SIZE
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#define IDLE_THREAD_STACK_SIZE 8
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#endif
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/**
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* Per-thread stack overhead for interrupts servicing, it is used in the
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* calculation of the correct working area size. In this port the default is
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* 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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* 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)
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/**
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* 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) - 1) + \
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(sizeof(struct extctx) - 1) + \
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(n) + (INT_REQUIRED_STACK))
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/**
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* Macro used to allocate a thread working area aligned as both position and
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* 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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* IRQ prologue code, inserted at the start of all IRQ handlers enabled to
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* invoke system APIs.
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* This code tricks the compiler to save the specified registers by "touching"
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* them.
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*/
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#define SYS_IRQ_PROLOGUE() { \
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asm ("" : : : "r18", "r19", "r20", "r21", "r22", "r23", "r24", \
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"r25", "r26", "r27", "r30", "r31"); \
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}
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/**
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* IRQ epilogue code, inserted at the end of all IRQ handlers enabled to
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* invoke system APIs.
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*/
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#define SYS_IRQ_EPILOGUE() { \
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if (chSchRescRequiredI()) \
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chSchDoRescheduleI(); \
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}
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/**
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* IRQ handler function modifier. Note, it just aliases the WinAVR "ISR"
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* macro.
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*/
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#define SYS_IRQ_HANDLER ISR
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/**
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* This port function is implemented as inlined code for performance reasons.
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*/
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#define sys_disable() asm volatile ("cli")
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/**
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* This port function is implemented as inlined code for performance reasons.
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*/
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#define sys_enable() asm volatile ("sei")
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/**
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* This function is empty in this port.
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*/
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#define sys_disable_from_isr()
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/**
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* This function is empty in this port.
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*/
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#define sys_enable_from_isr()
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#if ENABLE_WFI_IDLE != 0
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/**
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* This port function is implemented as inlined code for performance reasons.
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*/
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#define sys_wait_for_interrupt() { \
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asm volatile ("sleep"); \
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}
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#else
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#define sys_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 sys_puts(char *msg);
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void sys_switch(Thread *otp, Thread *ntp);
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void sys_halt(void);
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void threadstart(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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