Subversion Repositories s6soc

////////////////////////////////////////////////////////////////////////////////
//
// 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;
}