grub/lib/relocator.c
2009-10-11 23:00:40 +02:00

96 lines
2.5 KiB
C

/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB 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, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
void *
PREFIX (alloc) (grub_size_t size)
{
char *playground;
playground = grub_malloc ((RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
+ size
+ (RELOCATOR_SIZEOF (backward) +
RELOCATOR_ALIGN));
if (!playground)
return 0;
*(grub_size_t *) playground = size;
return playground + RELOCATOR_SIZEOF (forward);
}
void *
PREFIX (realloc) (void *relocator, grub_size_t size)
{
char *playground;
playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
playground = grub_realloc (playground,
(RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
+ size
+ (RELOCATOR_SIZEOF (backward) + RELOCATOR_ALIGN));
if (!playground)
return 0;
*(grub_size_t *) playground = size;
return playground + RELOCATOR_SIZEOF (forward);
}
void
PREFIX(free) (void *relocator)
{
if (relocator)
grub_free ((char *) relocator - RELOCATOR_SIZEOF (forward));
}
grub_err_t
PREFIX (boot) (void *relocator, grub_uint32_t dest,
struct grub_relocator32_state state)
{
grub_size_t size;
char *playground;
playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
size = *(grub_size_t *) playground;
if (UINT_TO_PTR (dest) >= relocator)
{
int overhead;
overhead =
ALIGN_UP (dest - RELOCATOR_SIZEOF (backward) - RELOCATOR_ALIGN,
RELOCATOR_ALIGN);
write_call_relocator_bw (relocator - overhead,
relocator - overhead,
dest - overhead, size + overhead, state);
}
else
{
int overhead;
overhead = ALIGN_UP (dest + size, RELOCATOR_ALIGN)
+ RELOCATOR_SIZEOF (forward) - (dest + size);
write_call_relocator_fw (relocator + size + overhead
- RELOCATOR_SIZEOF (forward),
relocator, dest, size + overhead, state);
}
/* Not reached. */
return GRUB_ERR_NONE;
}