ChibiOS/ports/AVR/chcore.h

/*
    ChibiOS/RT - Copyright (C) 2006-2007 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 <http://www.gnu.org/licenses/>.
*/

#ifndef _CHCORE_H_
#define _CHCORE_H_

/*
 * Interrupt saved context.
 */
struct extctx {
  BYTE8         _next;
  BYTE8         r31;
  BYTE8         r30;
  BYTE8         r27;
  BYTE8         r26;
  BYTE8         r25;
  BYTE8         r24;
  BYTE8         r23;
  BYTE8         r22;
  BYTE8         r21;
  BYTE8         r20;
  BYTE8         r19;
  BYTE8         r18;
  BYTE8         sr;
  BYTE8         r1;
  BYTE8         r0;
  UWORD16       pc;
};

/*
 * System saved context.
 */
struct intctx {
  BYTE8         _next;
  BYTE8         r29;
  BYTE8         r28;
  BYTE8         r17;
  BYTE8         r16;
  BYTE8         r15;
  BYTE8         r14;
  BYTE8         r13;
  BYTE8         r12;
  BYTE8         r11;
  BYTE8         r10;
#ifndef CH_CURRP_REGISTER_CACHE
  BYTE8         r9;
  BYTE8         r8;
#endif
  BYTE8         r7;
  BYTE8         r6;
  BYTE8         r5;
  BYTE8         r4;
  BYTE8         r3;
  BYTE8         r2;
  BYTE8         pcl;
  BYTE8         pch;
};

/*
 * Port dependent part of the Thread structure, you may add fields in
 * this structure.
 */
typedef struct {
  struct intctx *sp;
} Context;

/**
 * Platform dependent part of the \p chThdCreate() API.
 */
#define SETUP_CONTEXT(workspace, wsize, pf, arg) {                      \
  tp->p_ctx.sp = (struct intctx*)((BYTE8 *)workspace + wsize - 1 -      \
                                  (sizeof(struct intctx) - 1));         \
  tp->p_ctx.sp->r2  = (int)pf;                                          \
  tp->p_ctx.sp->r3  = (int)pf >> 8;                                     \
  tp->p_ctx.sp->r4  = (int)arg;                                         \
  tp->p_ctx.sp->r5  = (int)arg >> 8;                                    \
  tp->p_ctx.sp->pcl = (int)threadstart >> 8;                            \
  tp->p_ctx.sp->pch = (int)threadstart;                                 \
}

#define INT_REQUIRED_STACK 8
#define StackAlign(n) (n)
#define UserStackSize(n) StackAlign(sizeof(Thread) +                    \
                                    (sizeof(struct intctx) - 1) +       \
                                    (sizeof(struct extctx) - 1) +       \
                                    (n) + (INT_REQUIRED_STACK))
#define WorkingArea(s, n) BYTE8 s[UserStackSize(n)];

#define chSysLock() asm volatile ("cli")

#define chSysUnlock() asm volatile ("sei")

#define chSysIRQEnterI()                                                \
  asm ("" : : : "r18", "r19", "r20", "r21", "r22", "r23", "r24",        \
                "r25", "r26", "r27", "r30", "r31");


#define chSysIRQExitI() {                                               \
  if (chSchRescRequiredI())                                             \
    chSchDoRescheduleI();                                               \
}

#define IDLE_THREAD_STACK_SIZE 8
void _IdleThread(void *p) __attribute__((noreturn));

void chSysHalt(void) __attribute__((noreturn)) ;
void chSysSwitchI(Thread *otp, Thread *ntp);
void chSysPuts(char *msg);
void threadstart(void) __attribute__((naked));

#endif /* _CHCORE_H_ */