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/* Load runtime image of EFIemu. Functions common to 32/64-bit mode */
/*
* 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/>.
*/
#include <grub/file.h>
#include <grub/err.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/efiemu/efiemu.h>
#include <grub/cpu/efiemu.h>
/* Are we in 32 or 64-bit mode?*/
static grub_efiemu_mode_t grub_efiemu_mode = GRUB_EFIEMU_NOTLOADED;
/* Runtime ELF file */
static grub_ssize_t efiemu_core_size;
static void *efiemu_core = 0;
/* Linked list of segments */
static grub_efiemu_segment_t efiemu_segments = 0;
/* equivalent to sizeof (grub_efi_uintn_t) but taking the mode into account*/
int
grub_efiemu_sizeof_uintn_t (void)
{
if (grub_efiemu_mode == GRUB_EFIEMU32)
return 4;
if (grub_efiemu_mode == GRUB_EFIEMU64)
return 8;
return 0;
}
/* Check the header and set mode */
static grub_err_t
grub_efiemu_check_header (void *ehdr, grub_size_t size,
grub_efiemu_mode_t *mode)
{
/* Check the magic numbers. */
if ((*mode == GRUB_EFIEMU_NOTLOADED || *mode == GRUB_EFIEMU32)
&& grub_efiemu_check_header32 (ehdr,size))
{
*mode = GRUB_EFIEMU32;
return GRUB_ERR_NONE;
}
if ((*mode == GRUB_EFIEMU_NOTLOADED || *mode == GRUB_EFIEMU64)
&& grub_efiemu_check_header64 (ehdr,size))
{
*mode = GRUB_EFIEMU64;
return GRUB_ERR_NONE;
}
return grub_error (GRUB_ERR_BAD_OS, "invalid ELF magic");
}
/* Unload segments */
static int
grub_efiemu_unload_segs (grub_efiemu_segment_t seg)
{
grub_efiemu_segment_t segn;
for (; seg; seg = segn)
{
segn = seg->next;
grub_efiemu_mm_return_request (seg->handle);
grub_free (seg);
}
return 1;
}
grub_err_t
grub_efiemu_loadcore_unload(void)
{
switch (grub_efiemu_mode)
{
case GRUB_EFIEMU32:
grub_efiemu_loadcore_unload32 ();
break;
case GRUB_EFIEMU64:
grub_efiemu_loadcore_unload64 ();
break;
default:
break;
}
grub_efiemu_mode = GRUB_EFIEMU_NOTLOADED;
grub_free (efiemu_core);
efiemu_core = 0;
grub_efiemu_unload_segs (efiemu_segments);
efiemu_segments = 0;
grub_efiemu_free_syms ();
return GRUB_ERR_NONE;
}
/* Load runtime file and do some initial preparations */
grub_err_t
grub_efiemu_loadcore_init (grub_file_t file,
const char *filename)
{
grub_err_t err;
efiemu_core_size = grub_file_size (file);
efiemu_core = 0;
efiemu_core = grub_malloc (efiemu_core_size);
if (! efiemu_core)
return grub_errno;
if (grub_file_read (file, efiemu_core, efiemu_core_size)
!= (int) efiemu_core_size)
{
grub_free (efiemu_core);
efiemu_core = 0;
return grub_errno;
}
if (grub_efiemu_check_header (efiemu_core, efiemu_core_size,
&grub_efiemu_mode))
{
grub_free (efiemu_core);
efiemu_core = 0;
return GRUB_ERR_BAD_MODULE;
}
switch (grub_efiemu_mode)
{
case GRUB_EFIEMU32:
err = grub_efiemu_loadcore_init32 (efiemu_core, filename,
efiemu_core_size,
&efiemu_segments);
if (err)
{
grub_free (efiemu_core);
efiemu_core = 0;
grub_efiemu_mode = GRUB_EFIEMU_NOTLOADED;
return err;
}
break;
case GRUB_EFIEMU64:
err = grub_efiemu_loadcore_init64 (efiemu_core, filename,
efiemu_core_size,
&efiemu_segments);
if (err)
{
grub_free (efiemu_core);
efiemu_core = 0;
grub_efiemu_mode = GRUB_EFIEMU_NOTLOADED;
return err;
}
break;
default:
return grub_error (GRUB_ERR_BUG, "unknown EFI runtime");
}
return GRUB_ERR_NONE;
}
grub_err_t
grub_efiemu_loadcore_load (void)
{
grub_err_t err;
switch (grub_efiemu_mode)
{
case GRUB_EFIEMU32:
err = grub_efiemu_loadcore_load32 (efiemu_core, efiemu_core_size,
efiemu_segments);
if (err)
grub_efiemu_loadcore_unload ();
return err;
case GRUB_EFIEMU64:
err = grub_efiemu_loadcore_load64 (efiemu_core, efiemu_core_size,
efiemu_segments);
if (err)
grub_efiemu_loadcore_unload ();
return err;
default:
return grub_error (GRUB_ERR_BUG, "unknown EFI runtime");
}
}
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