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/*
* Sun (Sparc32/64) 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"
#ifdef CONFIG_DEBUG_SUN_PARTS
#define DPRINTF(fmt, args...) \
do { printk(fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...)
#endif
typedef struct {
ucell offs_hi, offs_lo;
ucell size_hi, size_lo;
int type;
} sunparts_info_t;
DECLARE_NODE( sunparts, INSTALL_OPEN, sizeof(sunparts_info_t), "+/packages/sun-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(); })
/* Layout of SUN partition table */
struct sun_disklabel {
uint8_t info[128]; /* Informative text string */
uint8_t spare0[14];
struct sun_info {
uint8_t spare1;
uint8_t id;
uint8_t spare2;
uint8_t flags;
} infos[8];
uint8_t spare[246]; /* Boot information etc. */
uint16_t rspeed; /* Disk rotational speed */
uint16_t pcylcount; /* Physical cylinder count */
uint16_t sparecyl; /* extra sects per cylinder */
uint8_t spare2[4]; /* More magic... */
uint16_t ilfact; /* Interleave factor */
uint16_t ncyl; /* Data cylinder count */
uint16_t nacyl; /* Alt. cylinder count */
uint16_t ntrks; /* Tracks per cylinder */
uint16_t nsect; /* Sectors per track */
uint8_t spare3[4]; /* Even more magic... */
struct sun_partition {
uint32_t start_cylinder;
uint32_t num_sectors;
} partitions[8];
uint16_t magic; /* Magic number */
uint16_t csum; /* Label xor'd checksum */
};
/* two helper functions */
static inline int
has_sun_part_magic(unsigned char *sect)
{
struct sun_disklabel *p = (struct sun_disklabel *)sect;
uint16_t csum, *ush, tmp16;
if (__be16_to_cpu(p->magic) != 0xDABE)
return 0;
csum = 0;
for (ush = (uint16_t *)p; ush < (uint16_t *)(p + 1); ush++) {
tmp16 = __be16_to_cpu(*ush);
csum ^= tmp16;
}
return csum == 0;
}
/* ( open -- flag ) */
static void
sunparts_open( sunparts_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 parnum = -1;
unsigned char buf[512];
struct sun_disklabel *p;
unsigned int i, bs;
ducell offs, size;
DPRINTF("sunparts_open '%s'\n", str );
if( str ) {
if( !strlen(str) )
parnum = -1;
else if (str[0] >= 'a' && str[0] < ('a' + 8))
parnum = str[0] - 'a';
else
parnum = atol(str);
free( str );
}
SEEK( 0 );
if( READ(buf, 512) != 512 )
RET(0);
/* Check Magic */
if (!has_sun_part_magic(buf)) {
DPRINTF("Sun partition magic not found.\n");
RET(0);
}
bs = 512;
/* get partition data */
p = (struct sun_disklabel *)buf;
for (i = 0; i < 8; i++) {
DPRINTF("%c: %d + %d, id %x, flags %x\n", 'a' + i, p->partitions[i].start_cylinder,
p->partitions[i].num_sectors, p->infos[i].id, p->infos[i].flags);
if (parnum < 0) {
if (p->partitions[i].num_sectors != 0 && p->infos[i].id != 0)
parnum = i;
}
}
if (parnum < 0)
parnum = 0;
DPRINTF("Selected partition %d\n", parnum);
offs = (llong)__be32_to_cpu(p->partitions[parnum].start_cylinder) *
__be16_to_cpu(p->ntrks) * __be16_to_cpu(p->nsect) * bs;
di->offs_hi = offs >> BITS;
di->offs_lo = offs & (ucell) -1;
size = (llong)__be32_to_cpu(p->partitions[parnum].num_sectors) * bs;
di->size_hi = size >> BITS;
di->size_lo = size & (ucell) -1;
di->type = __be32_to_cpu(p->infos[parnum].id);
DPRINTF("Found Sun partition table, offs %lld size %lld\n",
(llong)offs, (llong)size);
RET( -1 );
}
/* ( block0 -- flag? ) */
static void
sunparts_probe( __attribute__((unused))sunparts_info_t *dummy )
{
unsigned char *buf = (unsigned char *)POP();
RET ( has_sun_part_magic(buf) );
}
/* ( -- type offset.d size.d ) */
static void
sunparts_get_info( sunparts_info_t *di )
{
DPRINTF("Sun get_info\n");
PUSH( di->type );
PUSH( di->offs_lo );
PUSH( di->offs_hi );
PUSH( di->size_lo );
PUSH( di->size_hi );
}
static void
sunparts_block_size( __attribute__((unused))sunparts_info_t *di )
{
PUSH(512);
}
static void
sunparts_initialize( __attribute__((unused))sunparts_info_t *di )
{
fword("register-partition-package");
}
NODE_METHODS( sunparts ) = {
{ "probe", sunparts_probe },
{ "open", sunparts_open },
{ "get-info", sunparts_get_info },
{ "block-size", sunparts_block_size },
{ NULL, sunparts_initialize },
};
void
sunparts_init( void )
{
REGISTER_NODE( sunparts );
}
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