mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-20 10:35:34 +00:00
193 lines
4.8 KiB
C
193 lines
4.8 KiB
C
/*
|
|
* Copyright (c) 2007, Takahide Matsutsuka.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
|
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
|
|
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
/*
|
|
* \file
|
|
* Z80 machine-specific implementation for supporting multithread.
|
|
* \author
|
|
* Takahide Matsutsuka <markn@markn.org>
|
|
*/
|
|
#include "sys/mt.h"
|
|
#include "mtarch.h"
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
void
|
|
mtarch_init(void)
|
|
{
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
void
|
|
mtarch_start(struct mtarch_thread *t,
|
|
void (*function)(void *), void *data)
|
|
{
|
|
uint16_t i;
|
|
|
|
for(i = 0; i < MTARCH_STACKSIZE; i++) {
|
|
t->stack[i] = i;
|
|
}
|
|
|
|
t->sp = &t->stack[MTARCH_STACKSIZE - 1];
|
|
|
|
|
|
/* A parameter for method for thread function. */
|
|
*t->sp = (uint16_t)data;
|
|
--t->sp;
|
|
|
|
/* This will be a return address of thread function. */
|
|
*t->sp = (uint16_t)mt_exit;
|
|
--t->sp;
|
|
|
|
/* The thread function, is used as a return address of mtarch_switch. */
|
|
*t->sp = (uint16_t)function;
|
|
--t->sp;
|
|
|
|
/*
|
|
* Space for registers.
|
|
* af, bc, de, hl, ix, iy, af', bc', de', hl'
|
|
*/
|
|
/*
|
|
* Z80 stack basis:
|
|
* push stores the data AFTER decrementing sp.
|
|
* pop reads the data BEFORE incrementing sp.
|
|
*/
|
|
|
|
t->sp = t->sp - 9;
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
static struct mtarch_thread *running_thread;
|
|
static uint16_t *sptmp;
|
|
static void
|
|
mtarch_switch()
|
|
{
|
|
__asm
|
|
di ; disable interrupt
|
|
; normal registers
|
|
push af
|
|
push bc
|
|
push de
|
|
push hl
|
|
push ix
|
|
push iy
|
|
|
|
; back registers
|
|
ex af,af'
|
|
push af
|
|
exx
|
|
push bc
|
|
push de
|
|
push hl
|
|
|
|
; swap between running_thread->sp and SP reg
|
|
; _running_thread in asembler below points running_thread->sp
|
|
; sptmp = sp;
|
|
ld (_sptmp),sp
|
|
|
|
; sp = *(running_thread->sp);
|
|
ld ix,(_running_thread)
|
|
ld l,0(ix)
|
|
ld h,1(ix)
|
|
ld sp,hl
|
|
|
|
; running_thread->sp = sptmp;
|
|
ld hl,(_sptmp)
|
|
ld 0(ix),l
|
|
ld 1(ix),h
|
|
|
|
; back registers
|
|
pop hl
|
|
pop de
|
|
pop bc
|
|
exx
|
|
pop af
|
|
ex af,af'
|
|
|
|
; normal registers
|
|
pop iy
|
|
pop ix
|
|
pop hl
|
|
pop de
|
|
pop bc
|
|
pop af
|
|
ei ; enable interrupt
|
|
__endasm;
|
|
// here sp indicates the address that point the function
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
void
|
|
mtarch_exec(struct mtarch_thread *t)
|
|
{
|
|
running_thread = t;
|
|
mtarch_switch();
|
|
running_thread = NULL;
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
void
|
|
mtarch_remove()
|
|
{
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
void
|
|
mtarch_yield()
|
|
{
|
|
if (running_thread == NULL) {
|
|
/* ERROR! we have no runnning thread. */
|
|
return;
|
|
}
|
|
mtarch_switch();
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
void mtarch_stop(struct mtarch_thread *thread)
|
|
{
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
void
|
|
mtarch_pstop()
|
|
{
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
void
|
|
mtarch_pstart()
|
|
{
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
int
|
|
mtarch_stack_usage(struct mtarch_thread *t)
|
|
{
|
|
uint16_t i;
|
|
for (i = 0; i < MTARCH_STACKSIZE; i++) {
|
|
if (t->stack[i] != i) {
|
|
return MTARCH_STACKSIZE - i;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|