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/* ----------------------------------------------------------------------- *
*
* Copyright 2008 H. Peter Anvin - All Rights Reserved
* Copyright 2009 Intel Corporation; author: H. Peter Anvin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston MA 02110-1301, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* sdi.c
*
* Loader for the Microsoft System Deployment Image (SDI) format.
* Based on a historical patch by Remi Lefevre.
*/
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <minmax.h>
#include <sys/stat.h>
#include <console.h>
#include <dprintf.h>
#include <syslinux/loadfile.h>
#include <syslinux/movebits.h>
#include <syslinux/bootrm.h>
typedef uint8_t guid_t[16];
struct SDIHeader {
uint32_t Signature;
char Version[4];
uint64_t MDBtype;
uint64_t BootCodeOffset;
uint64_t BootCodeSize;
uint64_t VendorID;
uint64_t DeviceID;
guid_t DeviceModel;
uint64_t DeviceRole;
uint64_t Reserved1;
guid_t RuntimeGUID;
uint64_t RuntimeOEMrev;
uint64_t Reserved2;
uint64_t PageAlignment; /* BLOB alignment value in pages */
uint64_t Reserved3[48];
uint64_t Checksum;
};
#define SDI_LOAD_ADDR (16 << 20) /* 16 MB */
#define SDI_SIGNATURE ('$' + ('S' << 8) + ('D' << 16) + ('I' << 24))
static inline void error(const char *msg)
{
fputs(msg, stderr);
}
static int boot_sdi(void *ptr, size_t len)
{
const struct SDIHeader *hdr = ptr;
struct syslinux_memmap *mmap = NULL, *amap = NULL;
struct syslinux_rm_regs regs;
struct syslinux_movelist *ml = NULL;
/* **** Basic sanity checking **** */
if (hdr->Signature != SDI_SIGNATURE) {
fputs("No $SDI signature in file\n", stdout);
goto bail;
}
if (memcmp(hdr->Version, "0001", 4)) {
int i;
fputs("Warning: unknown SDI version: ", stdout);
for (i = 0; i < 4; i++)
putchar(hdr->Version[i]);
putchar('\n');
/* Then try anyway... */
}
/* **** Setup **** */
mmap = syslinux_memory_map();
amap = syslinux_dup_memmap(mmap);
if (!mmap || !amap)
goto bail;
/* **** Map the BOOT BLOB to 0x7c00 **** */
if (!hdr->BootCodeOffset) {
fputs("No BOOT BLOB in image\n", stdout);
goto bail;
}
if (!hdr->BootCodeSize) {
fputs("BOOT BLOB is empty\n", stdout);
goto bail;
}
if (len < hdr->BootCodeOffset + hdr->BootCodeSize) {
fputs("BOOT BLOB extends beyond file\n", stdout);
goto bail;
}
if (syslinux_memmap_type(amap, 0x7c00, hdr->BootCodeSize) != SMT_FREE) {
fputs("BOOT BLOB too large for memory\n", stdout);
goto bail;
}
if (syslinux_add_memmap(&amap, 0x7c00, hdr->BootCodeSize, SMT_ALLOC))
goto bail;
if (syslinux_add_movelist(&ml, 0x7c00, (addr_t) ptr + hdr->BootCodeOffset,
hdr->BootCodeSize))
goto bail;
/* **** Map the entire image to SDI_LOAD_ADDR **** */
if (syslinux_memmap_type(amap, SDI_LOAD_ADDR, len) != SMT_FREE) {
fputs("Image too large for memory\n", stdout);
goto bail;
}
if (syslinux_add_memmap(&amap, SDI_LOAD_ADDR, len, SMT_ALLOC))
goto bail;
if (syslinux_add_movelist(&ml, SDI_LOAD_ADDR, (addr_t) ptr, len))
goto bail;
/* **** Set up registers **** */
memset(®s, 0, sizeof regs);
regs.ip = 0x7c00;
regs.esp.l = 0x7c00;
regs.edx.l = SDI_LOAD_ADDR | 0x41;
fputs("Booting...\n", stdout);
syslinux_shuffle_boot_rm(ml, mmap, 0, ®s);
bail:
syslinux_free_memmap(amap);
syslinux_free_memmap(mmap);
syslinux_free_movelist(ml);
return -1;
}
/*
* Check that the sum of all bytes from first 512 bytes (SDI header)
* is 0 modulo 256.
*/
int has_valid_header(unsigned char *header)
{
unsigned char checksum;
unsigned int i;
checksum = 0;
for (i = 0; i < sizeof(struct SDIHeader); i++)
checksum += header[i];
return (!checksum);
}
int main(int argc, char *argv[])
{
void *data;
size_t data_len;
openconsole(&dev_null_r, &dev_stdcon_w);
if (argc != 2) {
error("Usage: sdi.c32 sdi_file\n");
return 1;
}
fputs("Loading ", stdout);
fputs(argv[1], stdout);
fputs("... ", stdout);
if (zloadfile(argv[1], &data, &data_len)) {
error("failed!\n");
return 1;
}
fputs("ok\n", stdout);
if (!has_valid_header(data)) {
error("SDI header is corrupted\n");
return 1;
}
boot_sdi(data, data_len);
error("Invalid SDI file or insufficient memory\n");
return 1;
}
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