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grub2.14406
0006-Add-support-for-EFI-handover-on-ARM64.patch
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File 0006-Add-support-for-EFI-handover-on-ARM64.patch of Package grub2.14406
From 17667c24295a4b105bf20a3bd5bb19ef0acaebba Mon Sep 17 00:00:00 2001 From: Matthew Garrett <mjg@redhat.com> Date: Fri, 21 Dec 2018 14:36:10 +0800 Subject: [PATCH 6/6] Add support for EFI handover on ARM64 Add support for EFI handover on ARM64 for loading linux kernel. --- grub-core/Makefile.core.def | 9 +- grub-core/loader/arm64/efi/linux.c | 448 +++++++++++++++++++++++++++++++++++++ 2 files changed, 453 insertions(+), 4 deletions(-) create mode 100644 grub-core/loader/arm64/efi/linux.c diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def index 1269f372c..f306311e6 100644 --- a/grub-core/Makefile.core.def +++ b/grub-core/Makefile.core.def @@ -1761,10 +1761,11 @@ module = { module = { name = linuxefi; - efi = loader/i386/efi/linux.c; - efi = lib/cmdline.c; - enable = i386_efi; - enable = x86_64_efi; + arm64 = loader/arm64/efi/linux.c; + x86_64 = loader/i386/efi/linux.c; + common = lib/cmdline.c; + enable = x86_64; + enable = arm64; }; module = { diff --git a/grub-core/loader/arm64/efi/linux.c b/grub-core/loader/arm64/efi/linux.c new file mode 100644 index 000000000..4a5c70e4b --- /dev/null +++ b/grub-core/loader/arm64/efi/linux.c @@ -0,0 +1,448 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2013 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/charset.h> +#include <grub/command.h> +#include <grub/err.h> +#include <grub/file.h> +#include <grub/fdt.h> +#include <grub/linux.h> +#include <grub/loader.h> +#include <grub/mm.h> +#include <grub/types.h> +#include <grub/cpu/linux.h> +#include <grub/efi/efi.h> +#include <grub/cpu/fdtload.h> +#include <grub/efi/memory.h> +#include <grub/efi/pe32.h> +#include <grub/i18n.h> +#include <grub/lib/cmdline.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +static grub_dl_t my_mod; +static int loaded; + +static void *kernel_addr; +static grub_uint64_t kernel_size; +static grub_uint32_t handover_offset; + +static char *linux_args; +static grub_uint32_t cmdline_size; + +static grub_addr_t initrd_start; +static grub_addr_t initrd_end; + +struct grub_arm64_linux_pe_header +{ + grub_uint32_t magic; + struct grub_pe32_coff_header coff; + struct grub_pe64_optional_header opt; +}; + +#if defined(__aarch64__) +# define GRUB_LINUX_ARMXX_MAGIC_SIGNATURE GRUB_ARM64_LINUX_MAGIC +# define linux_armxx_kernel_header grub_arm64_linux_kernel_header +# define grub_armxx_linux_pe_header grub_arm64_linux_pe_header +#endif + +#define SHIM_LOCK_GUID \ + { 0x605dab50, 0xe046, 0x4300, {0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23} } + +struct grub_efi_shim_lock +{ + grub_efi_status_t (*verify) (void *buffer, grub_uint32_t size); +}; +typedef struct grub_efi_shim_lock grub_efi_shim_lock_t; + +static grub_efi_boolean_t +grub_linuxefi_secure_validate (void *data, grub_uint32_t size) +{ + grub_efi_guid_t guid = SHIM_LOCK_GUID; + grub_efi_shim_lock_t *shim_lock; + + shim_lock = grub_efi_locate_protocol(&guid, NULL); + + if (!shim_lock) + return 1; + + if (shim_lock->verify(data, size) == GRUB_EFI_SUCCESS) + return 1; + + return 0; +} + +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wcast-align" + +typedef void (*handover_func) (void *, grub_efi_system_table_t *, void *); + +static grub_err_t +grub_efi_linux_boot (void *kernel_address, grub_off_t offset, + void *kernel_params) +{ + handover_func hf; + + hf = (handover_func)((char *)kernel_address + offset); + hf (grub_efi_image_handle, grub_efi_system_table, kernel_params); + + return GRUB_ERR_BUG; +} + +#pragma GCC diagnostic pop +static grub_err_t +grub_armxx_efi_linux_check_image (struct linux_armxx_kernel_header * lh) +{ + if (lh->magic != GRUB_LINUX_ARMXX_MAGIC_SIGNATURE) + return grub_error(GRUB_ERR_BAD_OS, "invalid magic number"); + + if ((lh->code0 & 0xffff) != GRUB_EFI_PE_MAGIC) + return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, + N_("plain image kernel not supported - rebuild with CONFIG_(U)EFI_STUB enabled")); + + grub_dprintf ("linux", "UEFI stub kernel:\n"); + grub_dprintf ("linux", "PE/COFF header @ %08x\n", lh->hdr_offset); + + return GRUB_ERR_NONE; +} + +static grub_err_t +finalize_params_linux (void) +{ + grub_efi_loaded_image_t *loaded_image = NULL; + int node, retval, len; + + void *fdt; + + fdt = grub_fdt_load (0x400); + + if (!fdt) + goto failure; + + node = grub_fdt_find_subnode (fdt, 0, "chosen"); + if (node < 0) + node = grub_fdt_add_subnode (fdt, 0, "chosen"); + + if (node < 1) + goto failure; + + /* Set initrd info */ + if (initrd_start && initrd_end > initrd_start) + { + grub_dprintf ("linux", "Initrd @ %p-%p\n", + (void *) initrd_start, (void *) initrd_end); + + retval = grub_fdt_set_prop64 (fdt, node, "linux,initrd-start", + initrd_start); + if (retval) + goto failure; + retval = grub_fdt_set_prop64 (fdt, node, "linux,initrd-end", + initrd_end); + if (retval) + goto failure; + } + + if (grub_fdt_install() != GRUB_ERR_NONE) + goto failure; + + grub_dprintf ("linux", "Installed/updated FDT configuration table @ %p\n", + fdt); + + /* Convert command line to UCS-2 */ + loaded_image = grub_efi_get_loaded_image (grub_efi_image_handle); + if (!loaded_image) + goto failure; + + loaded_image->load_options_size = len = + (grub_strlen (linux_args) + 1) * sizeof (grub_efi_char16_t); + loaded_image->load_options = + grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES (loaded_image->load_options_size)); + if (!loaded_image->load_options) + return grub_error(GRUB_ERR_BAD_OS, "failed to create kernel parameters"); + + loaded_image->load_options_size = + 2 * grub_utf8_to_utf16 (loaded_image->load_options, len, + (grub_uint8_t *) linux_args, len, NULL); + + return GRUB_ERR_NONE; + +failure: + grub_fdt_unload(); + return grub_error(GRUB_ERR_BAD_OS, "failed to install/update FDT"); +} + +static void +free_params (void) +{ + grub_efi_loaded_image_t *loaded_image = NULL; + + loaded_image = grub_efi_get_loaded_image (grub_efi_image_handle); + if (loaded_image) + { + if (loaded_image->load_options) + grub_efi_free_pages ((grub_efi_physical_address_t)(grub_efi_uintn_t)loaded_image->load_options, + GRUB_EFI_BYTES_TO_PAGES (loaded_image->load_options_size)); + loaded_image->load_options = NULL; + loaded_image->load_options_size = 0; + } +} + +static grub_err_t +grub_armxx_efi_linux_boot_image (grub_addr_t addr, char *args) +{ + grub_err_t retval; + + retval = finalize_params_linux (); + if (retval != GRUB_ERR_NONE) + return grub_errno; + + grub_dprintf ("linux", "linux command line: '%s'\n", args); + + retval = grub_efi_linux_boot ((char *)addr, handover_offset, (void *)addr); + + /* Never reached... */ + free_params(); + return retval; +} + +static grub_err_t +grub_linux_boot (void) +{ + return grub_armxx_efi_linux_boot_image((grub_addr_t)kernel_addr, linux_args); +} + +static grub_err_t +grub_linux_unload (void) +{ + grub_dl_unref (my_mod); + loaded = 0; + if (initrd_start) + grub_efi_free_pages ((grub_efi_physical_address_t) initrd_start, + GRUB_EFI_BYTES_TO_PAGES (initrd_end - initrd_start)); + initrd_start = initrd_end = 0; + grub_free (linux_args); + if (kernel_addr) + grub_efi_free_pages ((grub_addr_t) kernel_addr, + GRUB_EFI_BYTES_TO_PAGES (kernel_size)); + grub_fdt_unload (); + return GRUB_ERR_NONE; +} + +/* + * As per linux/Documentation/arm/Booting + * ARM initrd needs to be covered by kernel linear mapping, + * so place it in the first 512MB of DRAM. + * + * As per linux/Documentation/arm64/booting.txt + * ARM64 initrd needs to be contained entirely within a 1GB aligned window + * of up to 32GB of size that covers the kernel image as well. + * Since the EFI stub loader will attempt to load the kernel near start of + * RAM, place the buffer in the first 32GB of RAM. + */ +#ifdef __arm__ +#define INITRD_MAX_ADDRESS_OFFSET (512U * 1024 * 1024) +#else /* __aarch64__ */ +#define INITRD_MAX_ADDRESS_OFFSET (32ULL * 1024 * 1024 * 1024) +#endif + +/* + * This function returns a pointer to a legally allocated initrd buffer, + * or NULL if unsuccessful + */ +static void * +allocate_initrd_mem (int initrd_pages) +{ + grub_addr_t max_addr; + + if (grub_efi_get_ram_base (&max_addr) != GRUB_ERR_NONE) + return NULL; + + max_addr += INITRD_MAX_ADDRESS_OFFSET - 1; + + return grub_efi_allocate_pages_real (max_addr, initrd_pages, + GRUB_EFI_ALLOCATE_MAX_ADDRESS, + GRUB_EFI_LOADER_DATA); +} + +static grub_err_t +grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + struct grub_linux_initrd_context initrd_ctx = { 0, 0, 0 }; + int initrd_size, initrd_pages; + void *initrd_mem = NULL; + + if (argc == 0) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + if (!loaded) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, + N_("you need to load the kernel first")); + goto fail; + } + + if (grub_initrd_init (argc, argv, &initrd_ctx)) + goto fail; + + initrd_size = grub_get_initrd_size (&initrd_ctx); + grub_dprintf ("linux", "Loading initrd\n"); + + initrd_pages = (GRUB_EFI_BYTES_TO_PAGES (initrd_size)); + initrd_mem = allocate_initrd_mem (initrd_pages); + + if (!initrd_mem) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory")); + goto fail; + } + + if (grub_initrd_load (&initrd_ctx, argv, initrd_mem)) + goto fail; + + initrd_start = (grub_addr_t) initrd_mem; + initrd_end = initrd_start + initrd_size; + grub_dprintf ("linux", "[addr=%p, size=0x%x]\n", + (void *) initrd_start, initrd_size); + + fail: + grub_initrd_close (&initrd_ctx); + if (initrd_mem && !initrd_start) + grub_efi_free_pages ((grub_addr_t) initrd_mem, initrd_pages); + + return grub_errno; +} + +static grub_err_t +grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_file_t file = 0; + struct linux_armxx_kernel_header lh; + struct grub_armxx_linux_pe_header *pe; + + grub_dl_ref (my_mod); + + if (argc == 0) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + file = grub_file_open (argv[0]); + if (!file) + goto fail; + + kernel_size = grub_file_size (file); + + if (grub_file_read (file, &lh, sizeof (lh)) < (long) sizeof (lh)) + return grub_errno; + + if (grub_armxx_efi_linux_check_image (&lh) != GRUB_ERR_NONE) + goto fail; + + grub_loader_unset(); + + grub_dprintf ("linux", "kernel file size: %lld\n", (long long) kernel_size); + kernel_addr = grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES (kernel_size)); + grub_dprintf ("linux", "kernel numpages: %lld\n", + (long long) GRUB_EFI_BYTES_TO_PAGES (kernel_size)); + if (!kernel_addr) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory")); + goto fail; + } + + grub_file_seek (file, 0); + if (grub_file_read (file, kernel_addr, kernel_size) + < (grub_int64_t) kernel_size) + { + if (!grub_errno) + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), argv[0]); + goto fail; + } + + grub_dprintf ("linux", "kernel @ %p\n", kernel_addr); + + if (!grub_linuxefi_secure_validate (kernel_addr, kernel_size)) + { + grub_error (GRUB_ERR_INVALID_COMMAND, N_("%s has invalid signature"), argv[0]); + goto fail; + } + + pe = (void *)((unsigned long)kernel_addr + lh.hdr_offset); + handover_offset = pe->opt.entry_addr; + + cmdline_size = grub_loader_cmdline_size (argc, argv) + sizeof (LINUX_IMAGE); + linux_args = grub_malloc (cmdline_size); + if (!linux_args) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory")); + goto fail; + } + grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE)); + grub_create_loader_cmdline (argc, argv, + linux_args + sizeof (LINUX_IMAGE) - 1, + cmdline_size); + + if (grub_errno == GRUB_ERR_NONE) + { + grub_loader_set (grub_linux_boot, grub_linux_unload, 0); + loaded = 1; + } + +fail: + if (file) + grub_file_close (file); + + if (grub_errno != GRUB_ERR_NONE) + { + grub_dl_unref (my_mod); + loaded = 0; + } + + if (linux_args && !loaded) + grub_free (linux_args); + + if (kernel_addr && !loaded) + grub_efi_free_pages ((grub_addr_t) kernel_addr, + GRUB_EFI_BYTES_TO_PAGES (kernel_size)); + + return grub_errno; +} + + +static grub_command_t cmd_linux, cmd_initrd; + +GRUB_MOD_INIT (linux) +{ + cmd_linux = grub_register_command ("linuxefi", grub_cmd_linux, 0, + N_("Load Linux.")); + cmd_initrd = grub_register_command ("initrdefi", grub_cmd_initrd, 0, + N_("Load initrd.")); + my_mod = mod; +} + +GRUB_MOD_FINI (linux) +{ + grub_unregister_command (cmd_linux); + grub_unregister_command (cmd_initrd); +} -- 2.16.4
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