diff options
Diffstat (limited to 'contrib/syslinux/latest/libinstaller/syslxmod.c')
| -rw-r--r-- | contrib/syslinux/latest/libinstaller/syslxmod.c | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/contrib/syslinux/latest/libinstaller/syslxmod.c b/contrib/syslinux/latest/libinstaller/syslxmod.c deleted file mode 100644 index a68f19f..0000000 --- a/contrib/syslinux/latest/libinstaller/syslxmod.c +++ /dev/null @@ -1,197 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 1998-2008 H. Peter Anvin - All Rights Reserved - * Copyright 2009-2010 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., 53 Temple Place Ste 330, - * Boston MA 02111-1307, USA; either version 2 of the License, or - * (at your option) any later version; incorporated herein by reference. - * - * ----------------------------------------------------------------------- */ - -/* - * syslxmod.c - Code to provide a SYSLINUX code set to an installer. - */ - -#define _XOPEN_SOURCE 500 /* Required on glibc 2.x */ -#define _BSD_SOURCE -#include <stdio.h> -#include <inttypes.h> -#include <string.h> -#include <stddef.h> -#include <stdlib.h> - -#include "syslinux.h" -#include "syslxint.h" - - -/* - * Generate sector extents - */ -static void generate_extents(struct syslinux_extent *ex, int nptrs, - const sector_t *sectp, int nsect) -{ - uint32_t addr = 0x7c00 + 2*SECTOR_SIZE; - uint32_t base; - sector_t sect, lba; - unsigned int len; - - len = lba = base = 0; - - memset(ex, 0, nptrs * sizeof *ex); - - while (nsect) { - sect = *sectp++; - - if (len && sect == lba + len && - ((addr ^ (base + len * SECTOR_SIZE)) & 0xffff0000) == 0) { - /* We can add to the current extent */ - len++; - goto next; - } - - if (len) { - set_64_sl(&ex->lba, lba); - set_16_sl(&ex->len, len); - ex++; - } - - base = addr; - lba = sect; - len = 1; - - next: - addr += SECTOR_SIZE; - nsect--; - } - - if (len) { - set_64_sl(&ex->lba, lba); - set_16_sl(&ex->len, len); - ex++; - } -} - -/* - * Form a pointer based on a 16-bit patcharea/epa field - */ -static inline void *ptr(void *img, uint16_t *offset_p) -{ - return (char *)img + get_16_sl(offset_p); -} - -/* - * This patches the boot sector and the beginning of ldlinux.sys - * based on an ldlinux.sys sector map passed in. Typically this is - * handled by writing ldlinux.sys, mapping it, and then overwrite it - * with the patched version. If this isn't safe to do because of - * an OS which does block reallocation, then overwrite it with - * direct access since the location is known. - * - * Returns the number of modified bytes in ldlinux.sys if successful, - * otherwise -1. - */ -#define NADV 2 - -int syslinux_patch(const sector_t *sectp, int nsectors, - int stupid, int raid_mode, - const char *subdir, const char *subvol) -{ - struct patch_area *patcharea; - struct ext_patch_area *epa; - struct syslinux_extent *ex; - uint32_t *wp; - int nsect = ((boot_image_len + SECTOR_SIZE - 1) >> SECTOR_SHIFT) + 2; - uint32_t csum; - int i, dw, nptrs; - struct boot_sector *sbs = (struct boot_sector *)boot_sector; - uint64_t *advptrs; - - if (nsectors < nsect) - return -1; /* The actual file is too small for content */ - - /* Search for LDLINUX_MAGIC to find the patch area */ - for (wp = (uint32_t *)boot_image; get_32_sl(wp) != LDLINUX_MAGIC; - wp++) - ; - patcharea = (struct patch_area *)wp; - epa = ptr(boot_image, &patcharea->epaoffset); - - /* First sector need pointer in boot sector */ - set_32(ptr(sbs, &epa->sect1ptr0), sectp[0]); - set_32(ptr(sbs, &epa->sect1ptr1), sectp[0] >> 32); - sectp++; - - /* Handle RAID mode */ - if (raid_mode) { - /* Patch in INT 18h = CD 18 */ - set_16(ptr(sbs, &epa->raidpatch), 0x18CD); - } - - /* Set up the totals */ - dw = boot_image_len >> 2; /* COMPLETE dwords, excluding ADV */ - set_16_sl(&patcharea->data_sectors, nsect - 2); /* Not including ADVs */ - set_16_sl(&patcharea->adv_sectors, 2); /* ADVs need 2 sectors */ - set_32_sl(&patcharea->dwords, dw); - - /* Handle Stupid mode */ - if (stupid) { - /* Access only one sector at a time */ - set_16_sl(&patcharea->maxtransfer, 1); - } - - /* Set the sector extents */ - ex = ptr(boot_image, &epa->secptroffset); - nptrs = get_16_sl(&epa->secptrcnt); - - if (nsect > nptrs) { - /* Not necessarily an error in this case, but a general problem */ - fprintf(stderr, "Insufficient extent space, build error!\n"); - exit(1); - } - - /* -1 for the pointer in the boot sector, -2 for the two ADVs */ - generate_extents(ex, nptrs, sectp, nsect-1-2); - - /* ADV pointers */ - advptrs = ptr(boot_image, &epa->advptroffset); - set_64_sl(&advptrs[0], sectp[nsect-1-2]); - set_64_sl(&advptrs[1], sectp[nsect-1-1]); - - /* Poke in the base directory path */ - if (subdir) { - int sublen = strlen(subdir) + 1; - if (get_16_sl(&epa->dirlen) < sublen) { - fprintf(stderr, "Subdirectory path too long... aborting install!\n"); - exit(1); - } - memcpy_to_sl(ptr(boot_image, &epa->diroffset), subdir, sublen); - } - - /* Poke in the subvolume information */ - if (subvol) { - int sublen = strlen(subvol) + 1; - if (get_16_sl(&epa->subvollen) < sublen) { - fprintf(stderr, "Subvol name too long... aborting install!\n"); - exit(1); - } - memcpy_to_sl(ptr(boot_image, &epa->subvoloffset), subvol, sublen); - } - - /* Now produce a checksum */ - set_32_sl(&patcharea->checksum, 0); - - csum = LDLINUX_MAGIC; - for (i = 0, wp = (uint32_t *)boot_image; i < dw; i++, wp++) - csum -= get_32_sl(wp); /* Negative checksum */ - - set_32_sl(&patcharea->checksum, csum); - - /* - * Assume all bytes modified. This can be optimized at the expense - * of keeping track of what the highest modified address ever was. - */ - return dw << 2; -} |