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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013-2015 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/fdt.h>
#include <grub/mm.h>
#include <grub/cpu/fdtload.h>
#include <grub/err.h>
#include <grub/dl.h>
#include <grub/command.h>
#include <grub/file.h>
#include <grub/efi/efi.h>
static void *loaded_fdt;
static void *fdt;
static void *
get_firmware_fdt (void)
{
grub_efi_configuration_table_t *tables;
grub_efi_guid_t fdt_guid = GRUB_EFI_DEVICE_TREE_GUID;
void *firmware_fdt = NULL;
unsigned int i;
/* Look for FDT in UEFI config tables. */
tables = grub_efi_system_table->configuration_table;
for (i = 0; i < grub_efi_system_table->num_table_entries; i++)
if (grub_memcmp (&tables[i].vendor_guid, &fdt_guid, sizeof (fdt_guid)) == 0)
{
firmware_fdt = tables[i].vendor_table;
grub_dprintf ("linux", "found registered FDT @ %p\n", firmware_fdt);
break;
}
return firmware_fdt;
}
void *
grub_fdt_load (grub_size_t additional_size)
{
void *raw_fdt;
grub_size_t size;
if (fdt)
{
size = GRUB_EFI_BYTES_TO_PAGES (grub_fdt_get_totalsize (fdt));
grub_efi_free_pages ((grub_efi_physical_address_t) fdt, size);
}
if (loaded_fdt)
raw_fdt = loaded_fdt;
else
raw_fdt = get_firmware_fdt();
size =
raw_fdt ? grub_fdt_get_totalsize (raw_fdt) : GRUB_FDT_EMPTY_TREE_SZ;
size += additional_size;
grub_dprintf ("linux", "allocating %ld bytes for fdt\n", size);
fdt = grub_efi_allocate_pages (0, GRUB_EFI_BYTES_TO_PAGES (size));
if (!fdt)
return NULL;
if (raw_fdt)
{
grub_memmove (fdt, raw_fdt, size);
grub_fdt_set_totalsize (fdt, size);
}
else
{
grub_fdt_create_empty_tree (fdt, size);
}
return fdt;
}
grub_err_t
grub_fdt_install (void)
{
grub_efi_boot_services_t *b;
grub_efi_guid_t fdt_guid = GRUB_EFI_DEVICE_TREE_GUID;
grub_efi_status_t status;
b = grub_efi_system_table->boot_services;
status = b->install_configuration_table (&fdt_guid, fdt);
if (status != GRUB_EFI_SUCCESS)
return grub_error (GRUB_ERR_IO, "failed to install FDT");
grub_dprintf ("fdt", "Installed/updated FDT configuration table @ %p\n",
fdt);
return GRUB_ERR_NONE;
}
void
grub_fdt_unload (void) {
if (!fdt) {
return;
}
grub_efi_free_pages ((grub_efi_physical_address_t) fdt,
GRUB_EFI_BYTES_TO_PAGES (grub_fdt_get_totalsize (fdt)));
fdt = NULL;
}
static grub_err_t
grub_cmd_devicetree (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
grub_file_t dtb;
void *blob = NULL;
int size;
if (loaded_fdt)
grub_free (loaded_fdt);
loaded_fdt = NULL;
/* No arguments means "use firmware FDT". */
if (argc == 0)
{
return GRUB_ERR_NONE;
}
dtb = grub_file_open (argv[0]);
if (!dtb)
goto out;
size = grub_file_size (dtb);
blob = grub_malloc (size);
if (!blob)
goto out;
if (grub_file_read (dtb, blob, size) < size)
{
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), argv[0]);
goto out;
}
if (grub_fdt_check_header (blob, size) != 0)
{
grub_error (GRUB_ERR_BAD_OS, N_("invalid device tree"));
goto out;
}
out:
if (dtb)
grub_file_close (dtb);
if (blob)
{
if (grub_errno == GRUB_ERR_NONE)
loaded_fdt = blob;
else
grub_free (blob);
}
return grub_errno;
}
static grub_command_t cmd_devicetree;
GRUB_MOD_INIT (fdt)
{
cmd_devicetree =
grub_register_command ("devicetree", grub_cmd_devicetree, 0,
N_("Load DTB file."));
}
GRUB_MOD_FINI (fdt)
{
grub_unregister_command (cmd_devicetree);
}
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