diff options
Diffstat (limited to 'grub-core/loader/efi/fdt.c')
| -rw-r--r-- | grub-core/loader/efi/fdt.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/grub-core/loader/efi/fdt.c b/grub-core/loader/efi/fdt.c new file mode 100644 index 0000000..c86f283 --- /dev/null +++ b/grub-core/loader/efi/fdt.c @@ -0,0 +1,179 @@ +/* + * 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); +} |