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ixnet_init.c
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1996-09-28
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2KB
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95 lines
/*
* This file is part of ixnet.library for the Amiga.
* Copyright (C) 1996 by Jeff Shepherd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id:$
*
* $Log:$
*
*/
#define _KERNEL
#include "ixnet.h"
#include "kprintf.h"
#include <exec/memory.h>
#include <dos/var.h>
#include <string.h>
#include <unistd.h>
/* not changed after the library is initialized */
struct ixnet_base *ixnetbase = NULL;
struct ixemul_base *ixemulbase = NULL;
struct ExecBase *SysBase = NULL;
struct DosLibrary *DOSBase = NULL;
static struct
{
void **base;
char *name;
}
ix_libs[] =
{
{ (void **)&DOSBase, "dos.library" },
{ NULL, NULL }
};
int open_libraries(void)
{
int i;
for (i = 0; ix_libs[i].base; i++)
if (!(*(ix_libs[i].base) = (void *)OpenLibrary(ix_libs[i].name, 0)))
{
return 0;
}
return 1;
}
void close_libraries(void)
{
int i;
for (i = 0; ix_libs[i].base; i++)
if (*ix_libs[i].base)
CloseLibrary(*ix_libs[i].base);
}
struct ixnet_base *ixnet_init (struct ixnet_base *ixbase)
{
/* First set SysBase, because it is used by the 'u' macro. The Enforcer
manual recommends caching ExecBase because low-memory accesses are slower
when using Enforcer, besides the extra penalty of being in CHIP memory.
Also, lots of accesses to address 4 can hurt interrupt performance. */
SysBase = *(struct ExecBase **)4;
ixnetbase = ixbase;
/* This can't go here since we are running as ramlib */
/* ixemulbase = u.u_ixbase; */
if (!open_libraries())
{
close_libraries();
return 0;
}
return ixbase;
}