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/*
* Creation Date: <2003/12/03 22:10:45 samuel>
* Time-stamp: <2004/01/07 19:17:45 samuel>
*
* <disk-label.c>
*
* Partition support
*
* 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 "libopenbios/load.h"
#include "libc/diskio.h"
#include "libc/vsprintf.h"
#include "packages.h"
//#define DEBUG_DISK_LABEL
#ifdef DEBUG_DISK_LABEL
#define DPRINTF(fmt, args...) \
do { printk("DISK-LABEL - %s: " fmt, __func__ , ##args); } while (0)
#else
#define DPRINTF(fmt, args...) do { } while (0)
#endif
typedef struct {
xt_t parent_seek_xt;
xt_t parent_tell_xt;
xt_t parent_read_xt;
ucell offs_hi, offs_lo;
ucell size_hi, size_lo;
int block_size;
int type; /* partition type or -1 */
ihandle_t part_ih;
phandle_t filesystem_ph;
} dlabel_info_t;
DECLARE_NODE( dlabel, 0, sizeof(dlabel_info_t), "/packages/disk-label" );
/* ( -- ) */
static void
dlabel_close( __attribute__((unused))dlabel_info_t *di )
{
}
/* ( -- success? ) */
static void
dlabel_open( dlabel_info_t *di )
{
char *path;
char block0[512];
phandle_t ph;
int success=0;
cell status;
path = my_args_copy();
DPRINTF("dlabel-open '%s'\n", path );
di->part_ih = 0;
/* Find parent methods */
di->filesystem_ph = 0;
di->parent_seek_xt = find_parent_method("seek");
di->parent_tell_xt = find_parent_method("tell");
di->parent_read_xt = find_parent_method("read");
/* If arguments have been passed, determine the partition/filesystem type */
if (path && strlen(path)) {
/* Read first block from parent device */
DPUSH(0);
call_package(di->parent_seek_xt, my_parent());
POP();
PUSH(pointer2cell(block0));
PUSH(sizeof(block0));
call_package(di->parent_read_xt, my_parent());
status = POP();
if (status != sizeof(block0))
goto out;
/* Find partition handler */
PUSH( pointer2cell(block0) );
selfword("find-part-handler");
ph = POP_ph();
if( ph ) {
/* We found a suitable partition handler, so interpose it */
DPRINTF("Partition found on disk - scheduling interpose with ph " FMT_ucellx "\n", ph);
push_str(path);
PUSH_ph(ph);
fword("interpose");
success = 1;
} else {
/* unknown (or missing) partition map,
* try the whole disk
*/
DPRINTF("Unknown or missing partition map; trying whole disk\n");
/* Probe for filesystem from start of device */
DPUSH ( 0 );
PUSH_ih( my_self() );
selfword("find-filesystem");
ph = POP_ph();
if( ph ) {
/* If we have been asked to open a particular file, interpose the filesystem package with the passed filename as an argument */
di->filesystem_ph = ph;
DPRINTF("Located filesystem with ph " FMT_ucellx "\n", ph);
DPRINTF("path: %s length: %d\n", path, strlen(path));
if (path && strlen(path)) {
DPRINTF("INTERPOSE!\n");
push_str( path );
PUSH_ph( ph );
fword("interpose");
}
} else if (path && strcmp(path, "%BOOT") != 0) {
goto out;
}
success = 1;
}
} else {
/* No arguments were passed, so we just use the parent raw device directly */
success = 1;
}
out:
if( path )
free( path );
if( !success ) {
dlabel_close( di );
RET(0);
}
PUSH(-1);
}
/* ( addr len -- actual ) */
static void
dlabel_read( dlabel_info_t *di )
{
/* Call back up to parent */
call_package(di->parent_read_xt, my_parent());
}
/* ( pos.d -- status ) */
static void
dlabel_seek( dlabel_info_t *di )
{
/* Call back up to parent */
call_package(di->parent_seek_xt, my_parent());
}
/* ( -- filepos.d ) */
static void
dlabel_tell( dlabel_info_t *di )
{
/* Call back up to parent */
call_package(di->parent_tell_xt, my_parent());
}
/* ( addr len -- actual ) */
static void
dlabel_write( __attribute__((unused)) dlabel_info_t *di )
{
DDROP();
PUSH( -1 );
}
/* ( addr -- size ) */
static void
dlabel_load( __attribute__((unused)) dlabel_info_t *di )
{
/* Try the load method of the part package */
xt_t xt;
/* If we have a partition handle, invoke the load word on it */
if (di->part_ih) {
xt = find_ih_method("load", di->part_ih);
if (!xt) {
forth_printf("load currently not implemented for ihandle " FMT_ucellx "\n", di->part_ih);
PUSH(0);
return;
}
DPRINTF("calling load on ihandle " FMT_ucellx "\n", di->part_ih);
call_package(xt, di->part_ih);
} else {
/* Otherwise attempt load directly on the raw disk */
DPRINTF("calling load on raw disk ihandle " FMT_ucellx "\n", my_self());
load(my_self());
}
}
/* ( pathstr len -- ) */
static void
dlabel_dir( dlabel_info_t *di )
{
if ( di->filesystem_ph ) {
PUSH( my_self() );
push_str("dir");
PUSH( di->filesystem_ph );
fword("find-method");
POP();
fword("execute");
} else {
forth_printf("disk-label: Unable to determine filesystem\n");
POP();
POP();
}
}
NODE_METHODS( dlabel ) = {
{ "open", dlabel_open },
{ "close", dlabel_close },
{ "load", dlabel_load },
{ "read", dlabel_read },
{ "write", dlabel_write },
{ "seek", dlabel_seek },
{ "tell", dlabel_tell },
{ "dir", dlabel_dir },
};
void
disklabel_init( void )
{
REGISTER_NODE( dlabel );
}
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