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/*
* pc partition support
*
* Copyright (C) 2004 Stefan Reinauer
*
* This code is based (and copied in many places) from
* mac partition support by 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 "openbios/config.h"
#include "openbios/bindings.h"
#include "libc/byteorder.h"
#include "modules.h"
typedef struct {
ullong offs;
ullong size;
} pcparts_info_t;
DECLARE_NODE( pcparts, INSTALL_OPEN, sizeof(pcparts_info_t), "+/packages/pc-parts" );
#define SEEK( pos ) ({ DPUSH(pos); call_parent(seek_xt); POP(); })
#define READ( buf, size ) ({ PUSH((ucell)buf); PUSH(size); call_parent(read_xt); POP(); })
/* two helper functions */
static inline int has_pc_part_magic(unsigned char *sect)
{
return sect[510]==0x55 && sect[511]==0xAA;
}
static inline int is_pc_extended_part(unsigned char type)
{
return type==5 || type==0xf || type==0x85;
}
/* ( open -- flag ) */
static void
pcparts_open( pcparts_info_t *di )
{
char *str = my_args_copy();
xt_t seek_xt = find_parent_method("seek");
xt_t read_xt = find_parent_method("read");
int bs, parnum=-1;
/* Layout of PC partition table */
struct pc_partition {
unsigned char boot;
unsigned char head;
unsigned char sector;
unsigned char cyl;
unsigned char type;
unsigned char e_head;
unsigned char e_sector;
unsigned char e_cyl;
u32 start_sect; /* unaligned little endian */
u32 nr_sects; /* ditto */
} *p;
unsigned char buf[512];
/* printk("pcparts_open '%s'\n", str ); */
if( str ) {
parnum = atol(str);
if( !strlen(str) )
parnum = 1;
free( str );
}
if( parnum < 0 )
parnum = 1;
SEEK( 0 );
if( READ(buf, 512) != 512 )
RET(0);
/* Check Magic */
if (!has_pc_part_magic(buf)) {
printk("pc partition magic not found.\n");
RET(0);
}
/* get partition data */
p = (struct pc_partition *) (buf + 0x1be);
bs=512;
if (parnum < 4) {
/* primary partition */
p += parnum;
if (p->type==0 || is_pc_extended_part(p->type)) {
printk("partition %d does not exist\n", parnum+1 );
RET( 0 );
}
di->offs = (llong)(__le32_to_cpu(p->start_sect)) * bs;
di->size = (llong)(__le32_to_cpu(p->nr_sects)) * bs;
/* printk("Primary partition at sector %x\n",
__le32_to_cpu(p->start_sect)); */
RET( -1 );
} else {
/* Extended partition */
int i, cur_part;
unsigned long ext_start, cur_table;
/* Search for the extended partition
* which contains logical partitions */
for (i = 0; i < 4; i++) {
if (is_pc_extended_part(p[i].type))
break;
}
if (i >= 4) {
printk("Extended partition not found\n");
RET( 0 );
}
printk("Extended partition at %d\n", i+1);
/* Visit each logical partition labels */
ext_start = __le32_to_cpu(p[i].start_sect);
cur_table = ext_start;
cur_part = 4;
for (;;) {
/* printk("cur_part=%d at %x\n", cur_part, cur_table); */
SEEK( cur_table*bs );
if( READ(buf, sizeof(512)) != sizeof(512) )
RET( 0 );
if (!has_pc_part_magic(buf)) {
printk("Extended partition has no magic\n");
break;
}
p = (struct pc_partition *) (buf + 0x1be);
/* First entry is the logical partition */
if (cur_part == parnum) {
if (p->type==0) {
printk("Partition %d is empty\n", parnum+1);
RET( 0 );
}
di->offs =
(llong)(cur_table+__le32_to_cpu(p->start_sect)) * bs;
di->size = (llong)__le32_to_cpu(p->nr_sects) * bs;
RET ( -1 );
}
/* Second entry is link to next partition */
if (!is_pc_extended_part(p[1].type)) {
printk("no link\n");
break;
}
cur_table = ext_start + __le32_to_cpu(p[1].start_sect);
cur_part++;
}
printk("Logical partition %d does not exist\n", parnum+1);
RET( 0 );
}
/* we should never reach this point */
}
/* ( block0 -- flag? ) */
static void
pcparts_probe( pcparts_info_t *dummy )
{
unsigned char *buf = (unsigned char *)POP();
RET ( has_pc_part_magic(buf) );
}
/* ( -- type offset.d size.d ) */
static void
pcparts_get_info( pcparts_info_t *di )
{
PUSH( -1 ); /* no type */
DPUSH( di->offs );
DPUSH( di->size );
}
static void
pcparts_block_size( __attribute__((unused))pcparts_info_t *di )
{
PUSH(512);
}
static void
pcparts_initialize( pcparts_info_t *di )
{
fword("register-partition-package");
}
NODE_METHODS( pcparts ) = {
{ "probe", pcparts_probe },
{ "open", pcparts_open },
{ "get-info", pcparts_get_info },
{ "block-size", pcparts_block_size },
{ NULL, pcparts_initialize },
};
void
pcparts_init( void )
{
REGISTER_NODE( pcparts );
}
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