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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 that are executed from FLASH memory.

//

// 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"

#include "txfns.h"

typedef unsigned        size_t;

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;

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

#define CONTEXT_LENGTH  (80000-1)       // 1ms

int     LAST_TASK;

__attribute__((cold))

TASKP   *ksetup(void) {

        TASKP   *tasklist;

        volatile IOSPACE *const sys = _sys;

        sys->io_spio = 0x0f0;

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

        LAST_TASK = kntasks();

        heap = (char *)_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(64);      //rxpipe->m_wrtask=INTERRUPT_WRITE_TASK;

        txpipe  = new_syspipe(64);      txpipe->m_rdtask = INTERRUPT_READ_TASK;

        keypipe = new_syspipe(64);

        lcdpipe = new_syspipe(64);

        pwmpipe = new_syspipe(512);     pwmpipe->m_rdtask= INTERRUPT_READ_TASK;

        cmdpipe = new_syspipe(64);

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

        kinit(tasklist);

        tasklist[LAST_TASK] = new_task(8, idle_task);

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

        sys->io_pic = INT_CLEARPIC;

        sys->io_timer = CONTEXT_LENGTH | TM_REPEAT;

        {

                // Reset our wishbone scope for debug later

                _scope->s_ctrl = 2;

        }

        sys->io_spio = 0x0f1;

        return tasklist;

}

void    kwait_on_buttonpress(void) {

        // 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;

}

// __attribute__((noreturn))

void    kuserexit(int a) {

        syscall(TRAPID_EXIT, a, 0, 0);

}

__attribute__((malloc))

void    *sys_malloc(size_t sz) {

        void    *res = heap;

        heap = heap + ((sz+3)&-4);

        return res;

}

KFILDES *kopen(int id, KDEVICE *dev) {

        KFILDES *fd = (KFILDES *)sys_malloc(sizeof(KFILDES));

        fd->id = (int)id;

        fd->dev= dev;

        return fd;

}