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/*
* Creation Date: <2003/11/26 16:55:47 samuel>
* Time-stamp: <2004/01/07 19:41:54 samuel>
*
* <pseudodisk.c>
*
* pseudodisk (contains files exported from linux)
*
* Copyright (C) 2003, 2004 Samuel Rydh (samuel@ibrium.se)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2
*
*/
#include "config.h"
#include "libopenbios/bindings.h"
#include "osi_calls.h"
#include "libc/string.h"
#include "libopenbios/ofmem.h"
#include "mol/prom.h"
#include "mol/mol.h"
#include "osi_calls.h"
#include "pseudofs_sh.h"
typedef struct {
int seekpos;
int fd;
char *myargs;
char *name;
int size;
} pdisk_data_t;
DECLARE_NODE( pdisk, INSTALL_OPEN, sizeof(pdisk_data_t), "/mol/pseudo-disk/disk" );
static void
pdisk_open( pdisk_data_t *pb )
{
char *ep, *name = NULL;
int part;
pb->myargs = my_args_copy();
/* printk("pdisk-open: %s\n", pb->myargs ); */
part = strtol( pb->myargs, &ep, 10 );
if( *ep ) {
if( (name=strchr(pb->myargs, ',')) ) {
*name = 0;
name++;
} else {
name = pb->myargs;
}
}
if( part )
goto err;
if( !name || !strlen(name) )
pb->fd = -1;
else {
if( (pb->fd=PseudoFSOpen(name)) < 0 )
goto err;
pb->size = PseudoFSGetSize( pb->fd );
}
pb->name = name;
RET( -1 );
err:
free( pb->myargs );
RET(0);
}
/* ( addr len -- actual ) */
static void
pdisk_read( pdisk_data_t *pb )
{
int len = POP();
char *dest = (char*)POP();
int cnt;
if( pb->fd < 0 ) {
memset( dest, 0, len );
PUSH(len);
return;
}
/* dest is not "mol-DMA" safe (might have a nontrivial mapping) */
for( cnt=0; cnt<len; ) {
char buf[2048];
int n = MIN( len-cnt, sizeof(buf) );
n = PseudoFSRead( pb->fd, pb->seekpos, buf, n );
if( n <= 0 )
break;
memcpy( dest+cnt, buf, n );
cnt += n;
pb->seekpos += n;
}
PUSH( cnt );
}
/* ( addr len -- actual ) */
static void
pdisk_write( pdisk_data_t *pb )
{
POP(); POP(); PUSH(-1);
printk("pdisk write\n");
}
/* ( pos.lo pos.hi -- status ) */
static void
pdisk_seek( pdisk_data_t *pb )
{
int pos_lo;
POP();
pos_lo = POP();
if( pb->fd >= 0 ) {
if( pos_lo == -1 )
pos_lo = pb->size;
}
pb->seekpos = pos_lo;
PUSH(0); /* ??? */
}
/* ( -- pos.d ) */
static void
pdisk_tell( pdisk_data_t *pb )
{
DPUSH( pb->seekpos );
}
/* ( -- cstr ) */
static void
pdisk_get_path( pdisk_data_t *pb )
{
PUSH( (int)pb->name );
}
/* ( -- cstr ) */
static void
pdisk_get_fstype( pdisk_data_t *pb )
{
PUSH( (int)"PSEUDO" );
}
/* ( -- cstr ) */
static void
pdisk_volume_name( pdisk_data_t *pb )
{
PUSH( (int)"Virtual Volume" );
}
static void
pdisk_block_size( pdisk_data_t *pb )
{
PUSH(1);
}
NODE_METHODS( pdisk ) = {
{ "open", pdisk_open },
{ "read", pdisk_read },
{ "write", pdisk_write },
{ "seek", pdisk_seek },
{ "tell", pdisk_tell },
{ "block-size", pdisk_block_size },
{ "get-path", pdisk_get_path },
{ "get-fstype", pdisk_get_fstype },
{ "volume-name", pdisk_volume_name },
};
void
pseudodisk_init( void )
{
REGISTER_NODE( pdisk );
}
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