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////////////////////////////////////////////////////////////////////////////////

//

// Filename:    ksetup.c

//

// Project:     CMod S6 System on a Chip, ZipCPU demonstration project

//

// Purpose:     These are the routines from kernel.c that didn't need to be

//              in RAM memory.  They are specifically the pre-run setup

//      routines.

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Technology, LLC

//

////////////////////////////////////////////////////////////////////////////////

//

// Copyright (C) 2015-2016, Gisselquist Technology, LLC

//

// This program is free software (firmware): 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.

//

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY 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.  (It's in the $(ROOT)/doc directory, run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

////////////////////////////////////////////////////////////////////////////////

//

//

#include "zipsys.h"

#include "board.h"

#include "ksched.h"

#include "kfildes.h"

#include "taskp.h"

#include "syspipe.h"

#include "ktraps.h"

#include "errno.h"

#include "swint.h"

extern int      kntasks(void);

extern void     kinit(TASKP *tasklist);

extern  void    restore_context(int *), save_context(int *);

SYSPIPE *rxpipe, *txpipe, *keypipe, *lcdpipe, *pwmpipe, *cmdpipe;

KDEVICE *pipedev, *txdev, *pwmdev;

void    *heap; //  = _top_of_heap; // Need to wait on startup to set this

#define CONTEXT_LENGTH  100000  // 1ms

int     LAST_TASK;

TASKP   *ksetup(void) {

        TASKP   *tasklist;

        IOSPACE *sys = (IOSPACE *)IOADDR;

        sys->io_spio = 0x0f0;

        sys->io_timb = 0;        // Turn off the watchdog timer

        LAST_TASK = kntasks();

        heap = _top_of_heap;

        pipedev = sys_malloc(sizeof(KDEVICE));

        pipedev->write = (RWFDFUN)kwrite_syspipe;

        pipedev->read  = (RWFDFUN)kread_syspipe;

        pipedev->close = NULL;

        txdev = pwmdev = pipedev;

        rxpipe  = new_syspipe(16);      //rxpipe->m_wrtask=INTERRUPT_WRITE_TASK;

        txpipe  = new_syspipe(8);       txpipe->m_rdtask = INTERRUPT_READ_TASK;

        keypipe = new_syspipe(16);

        lcdpipe = new_syspipe(16);

        pwmpipe = new_syspipe(256);     pwmpipe->m_rdtask= INTERRUPT_READ_TASK;

        cmdpipe = new_syspipe(16);

        tasklist = sys_malloc(sizeof(TASKP)*(1+LAST_TASK));

        kinit(tasklist);

        tasklist[LAST_TASK] = new_task(2, idle_task);

        // Turn all interrupts off, acknowledge all at the same time

        sys->io_pic = 0x7fff7fff;

        sys->io_tima = CONTEXT_LENGTH | TM_REPEAT;

        {

                // Reset our wishbone scope for debug later

                SCOPE   *scope = (SCOPE *)SCOPEADDR;

                scope->s_control = 2;

        }

        sys->io_spio = 0x0f1;

        return tasklist;

}

void    kwait_on_buttonpress(void) {

        IOSPACE *sys = (IOSPACE *)IOADDR;

        // Wait on a button press before starting

        while((sys->io_spio & 0x0f0)==0)

                ;

        sys->io_spio = 0x0f3;

        for(int i=0; i<40000; i++)

                sys->io_spio = ((i>>14)&2)|0x020;

        sys->io_spio = 0x0f7;

}

void    kuserexit(int a) {

        syscall(TRAPID_EXIT, a, 0, 0);

}

void    *sys_malloc(int sz) {

        {

                SCOPE   *s = (SCOPE *)SCOPEADDR;

                s->s_control = TRIGGER_SCOPE_NOW | (s->s_control & 0x0ffff);

        }

        void    *res = heap;

        heap += sz;

        if ((int)heap > ((int)&res)-32) {

                IOSPACE *sys = (IOSPACE *)IOADDR;

                sys->io_spio = 0xf3;

                asm("break 0");

        }

        return res;

}