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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/err.h>
#include <grub/dl.h>
#include <grub/command.h>
#include <grub/file.h>
#include <grub/efi/efi.h>
#include <grub/efi/fdtload.h>
#include <grub/efi/memory.h>
#include <grub/cpu/efi/memory.h>
static void *loaded_fdt;
static void *fdt;
#define FDT_ADDR_CELLS_STRING "#address-cells"
#define FDT_SIZE_CELLS_STRING "#size-cells"
#define FDT_ADDR_SIZE_EXTRA ((2 * grub_fdt_prop_entry_size (sizeof(grub_uint32_t))) + \
sizeof (FDT_ADDR_CELLS_STRING) + \
sizeof (FDT_SIZE_CELLS_STRING))
void *
grub_fdt_load (grub_size_t additional_size)
{
void *raw_fdt;
unsigned int size;
if (fdt)
{
size = GRUB_EFI_BYTES_TO_PAGES (grub_fdt_get_totalsize (fdt));
grub_efi_free_pages ((grub_addr_t) fdt, size);
}
if (loaded_fdt)
raw_fdt = loaded_fdt;
else
raw_fdt = grub_efi_get_firmware_fdt();
if (raw_fdt)
size = grub_fdt_get_totalsize (raw_fdt);
else
size = GRUB_FDT_EMPTY_TREE_SZ + FDT_ADDR_SIZE_EXTRA;
size += additional_size;
grub_dprintf ("linux", "allocating %d bytes for fdt\n", size);
fdt = grub_efi_allocate_pages_real (GRUB_EFI_MAX_USABLE_ADDRESS,
GRUB_EFI_BYTES_TO_PAGES (size),
GRUB_EFI_ALLOCATE_MAX_ADDRESS,
GRUB_EFI_ACPI_RECLAIM_MEMORY);
if (!fdt)
return NULL;
if (raw_fdt)
{
grub_memmove (fdt, raw_fdt, size - additional_size);
grub_fdt_set_totalsize (fdt, size);
}
else
{
grub_fdt_create_empty_tree (fdt, size);
grub_fdt_set_prop32 (fdt, 0, FDT_ADDR_CELLS_STRING, 2);
grub_fdt_set_prop32 (fdt, 0, FDT_SIZE_CELLS_STRING, 2);
}
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_addr_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], GRUB_FILE_TYPE_DEVICE_TREE_IMAGE);
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_lockdown ("devicetree", grub_cmd_devicetree, 0,
N_("Load DTB file."));
}
GRUB_MOD_FINI (fdt)
{
grub_unregister_command (cmd_devicetree);
}
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