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/* boot.c - Boot image composition */
/* Copyright 1992-1997 Werner Almesberger. See file COPYING for details. */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <a.out.h>
#include <sys/stat.h>
#include "config.h"
#include "common.h"
#include "lilo.h"
#include "geometry.h"
#include "cfg.h"
#include "map.h"
#include "partition.h"
#include "boot.h"
static GEOMETRY geo;
static struct stat st;
static void check_size(char *name,int setup_secs,int sectors)
{
if (sectors > setup_secs+MAX_KERNEL_SECS)
die("Kernel %s is too big",name);
}
void boot_image(char *spec,IMAGE_DESCR *descr)
{
BOOT_SECTOR buff;
SETUP_HDR hdr;
char *initrd;
int setup,fd,sectors;
int modern_kernel;
if (verbose > 0) printf("Boot image: %s\n",spec);
fd = geo_open(&geo,spec,O_RDONLY);
if (fstat(fd,&st) < 0) die("fstat %s: %s",spec,strerror(errno));
if (read(fd,(char *) &buff,SECTOR_SIZE) != SECTOR_SIZE)
die("read %s: %s",spec,strerror(errno));
#ifdef LCF_VARSETUP
setup = buff.sector[VSS_NUM] ? buff.sector[VSS_NUM] : SETUPSECS;
#else
setup = SETUPSECS;
#endif
if (read(fd,(char *) &hdr,sizeof(hdr)) != sizeof(hdr))
die("read %s: %s",spec,strerror(errno));
modern_kernel = !strncmp(hdr.signature,NEW_HDR_SIG,4) && hdr.version >=
NEW_HDR_VERSION;
if (modern_kernel) descr->flags |= FLAG_MODKRN;
if (verbose > 1)
printf("Setup length is %d sector%s.\n",setup,setup == 1 ? "" : "s");
map_add(&geo,0,(st.st_size+SECTOR_SIZE-1)/SECTOR_SIZE);
sectors = map_end_section(&descr->start,setup+SPECIAL_SECTORS);
if (!modern_kernel || !(hdr.flags & LFLAG_HIGH))
check_size(spec,setup,sectors);
else {
if (hdr.start % PAGE_SIZE)
die("Can't load kernel at mis-aligned address 0x%08lx\n",hdr.start);
descr->start_page = hdr.start/PAGE_SIZE; /* load kernel high */
}
geo_close(&geo);
if (verbose > 1)
printf("Mapped %d sector%s.\n",sectors,sectors == 1 ? "" : "s");
if ((initrd = cfg_get_strg(cf_kernel,"initrd")) || (initrd = cfg_get_strg(
cf_options,"initrd"))) {
if (!modern_kernel) die("Kernel doesn't support initial RAM disks");
if (verbose > 0) printf("Mapping RAM disk %s\n",initrd);
fd = geo_open(&geo,initrd,O_RDONLY);
if (fstat(fd,&st) < 0) die("fstat %s: %s",initrd,strerror(errno));
*(unsigned long *) descr->rd_size = st.st_size;
map_begin_section();
map_add(&geo,0,(st.st_size+SECTOR_SIZE-1)/SECTOR_SIZE);
sectors = map_end_section(&descr->initrd,0);
if (verbose > 1)
printf("RAM disk: %d sector%s.\n",sectors,sectors == 1 ? "" :
"s");
geo_close(&geo);
}
}
void boot_device(char *spec,char *range,IMAGE_DESCR *descr)
{
char *here;
int start,secs;
int sectors;
if (verbose > 0) printf("Boot device: %s, range %s\n",spec,range);
(void) geo_open(&geo,spec,O_NOACCESS);
here = strchr(range,'-');
if (here) {
*here++ = 0;
start = to_number(range);
if ((secs = to_number(here)-start+1) < 0) die("Invalid range");
}
else {
here = strchr(range,'+');
if (here) {
*here++ = 0;
start = to_number(range);
secs = to_number(here);
}
else {
start = to_number(range);
secs = 1;
}
}
map_add(&geo,start,secs);
check_size(spec,SETUPSECS,sectors = map_end_section(&descr->start,60));
/* this is a crude hack ... ----------^^*/
geo_close(&geo);
if (verbose > 1)
printf("Mapped %d sector%s.\n",sectors,sectors == 1 ? "" : "s");
}
void do_map_drive(void)
{
const char *tmp;
char *end;
int from,to;
tmp = cfg_get_strg(cf_other,"map-drive");
from = strtoul(tmp,&end,0);
if (from > 0xff || *end)
cfg_error("Invalid drive specification \"%s\"",tmp);
cfg_init(cf_map_drive);
(void) cfg_parse(cf_map_drive);
tmp = cfg_get_strg(cf_map_drive,"to");
if (!tmp) cfg_error("TO is required");
to = strtoul(tmp,&end,0);
if (to > 0xff || *end)
cfg_error("Invalid drive specification \"%s\"",tmp);
if (from || to) { /* 0 -> 0 is special */
int i;
for (i = 0; i < curr_drv_map; i++) {
if (drv_map[i] == ((to << 8) | from))
die("Mapping 0x%02x to 0x%02x already exists",from,to);
if ((drv_map[i] & 0xff) == from)
die("Ambiguous mapping 0x%02x to 0x%02x or 0x%02x",from,
drv_map[i] >> 8,to);
}
if (curr_drv_map == DRVMAP_SIZE)
cfg_error("Too many drive mappings (more than %d)",DRVMAP_SIZE);
if (verbose > 3)
printf(" Mapping BIOS drive 0x%02x to 0x%02x\n",from,to);
drv_map[curr_drv_map++] = (to << 8) | from;
}
cfg_unset(cf_other,"map-drive");
}
#define PART(s,n) (((struct partition *) (s)[0].par_c.ptable)[(n)])
void boot_other(char *loader,char *boot,char *part,IMAGE_DESCR *descr)
{
int b_fd,l_fd,p_fd,walk,found,size;
unsigned short magic;
BOOT_SECTOR buff[SETUPSECS-1];
struct stat st;
char *pos;
int i;
if (!loader) loader = DFL_CHAIN;
if (verbose > 0)
printf("Boot other: %s%s%s, loader %s\n",boot,part ? ", on " : "",part
? part : "",loader);
if (cfg_get_flag(cf_other,"unsafe")) {
(void) geo_open_boot(&geo,boot);
if (part) die("TABLE and UNSAFE are mutually incompatible.");
}
else {
b_fd = geo_open(&geo,boot,O_RDONLY);
if (fstat(b_fd,&st) < 0)
die("fstat %s: %s",boot,strerror(errno));
if (!geo.file) part_verify(st.st_rdev,0);
if (lseek(b_fd,(long) BOOT_SIG_OFFSET,0) < 0)
die("lseek %s: %s",boot,strerror(errno));
if ((size = read(b_fd,(char *) &magic,2)) != 2)
if (size < 0) die("read %s: %s",boot,strerror(errno));
else die("Can't get magic number of %s",boot);
if (magic != BOOT_SIGNATURE)
die("First sector of %s doesn't have a valid boot signature",boot);
}
memset(buff,0,sizeof(buff));
if ((l_fd = open(loader,O_RDONLY)) < 0)
die("open %s: %s",loader,strerror(errno));
if ((size = read(l_fd,buff,sizeof(buff)+1)) < 0)
die("read %s: %s",loader,strerror(errno));
check_version(buff,STAGE_CHAIN);
if (size > sizeof(buff))
die("Chain loader %s is too big",loader);
if (!part) p_fd = -1; /* pacify GCC */
else {
if ((p_fd = open(part,O_RDONLY)) < 0)
die("open %s: %s",part,strerror(errno));
if (lseek(p_fd,(long) PART_TABLE_OFFSET,0) < 0)
die("lseek %s: %s",part,strerror(errno));
if (read(p_fd,(char *) buff[0].par_c.ptable,PART_TABLE_SIZE) !=
PART_TABLE_SIZE)
die("read %s: %s",part,strerror(errno));
found = 0;
for (walk = 0; walk < PARTITION_ENTRIES; walk++)
if (!PART(buff,walk).sys_ind || PART(buff,walk).start_sect !=
geo.start) {
/*
* Don't remember what this is supposed to be good for :-(
*/
if (PART(buff,walk).sys_ind != PART_DOS12 && PART(buff,walk).
sys_ind != PART_DOS16_SMALL && PART(buff,walk).sys_ind !=
PART_DOS16_BIG)
PART(buff,walk).sys_ind = PART_INVALID;
}
else {
if (found) die("Duplicate entry in partition table");
buff[0].par_c.offset = walk*PARTITION_ENTRY;
PART(buff,walk).boot_ind = 0x80;
found = 1;
}
if (!found) die("Partition entry not found.");
(void) close(p_fd);
}
(void) close(l_fd);
buff[0].par_c.drive = geo.device;
drv_map[curr_drv_map] = 0;
prt_map[curr_prt_map] = 0;
pos = (char *) buff+buff[0].par_c.drvmap;
memcpy(pos,drv_map,sizeof(drv_map));
memcpy(pos+sizeof(drv_map),prt_map,sizeof(prt_map)-2);
map_add_zero();
for (i = 0; i < SETUPSECS-1; i++) map_add_sector(&buff[i]);
map_add(&geo,0,1);
(void) map_end_section(&descr->start,SETUPSECS+SPECIAL_SECTORS);
/* size is known */
geo_close(&geo);
if (verbose > 1)
printf("Mapped %d (%d+1+1) sectors.\n",SETUPSECS+2,SETUPSECS);
}
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