diff options
Diffstat (limited to 'grub-core/loader/arm64/xen_boot.c')
-rw-r--r-- | grub-core/loader/arm64/xen_boot.c | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/grub-core/loader/arm64/xen_boot.c b/grub-core/loader/arm64/xen_boot.c new file mode 100644 index 0000000..22cc25e --- /dev/null +++ b/grub-core/loader/arm64/xen_boot.c @@ -0,0 +1,527 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2014 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/cache.h> +#include <grub/charset.h> +#include <grub/command.h> +#include <grub/err.h> +#include <grub/file.h> +#include <grub/fdt.h> +#include <grub/list.h> +#include <grub/loader.h> +#include <grub/misc.h> +#include <grub/mm.h> +#include <grub/types.h> +#include <grub/cpu/linux.h> +#include <grub/efi/efi.h> +#include <grub/efi/fdtload.h> +#include <grub/efi/memory.h> +#include <grub/efi/pe32.h> /* required by struct xen_hypervisor_header */ +#include <grub/i18n.h> +#include <grub/lib/cmdline.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#define XEN_HYPERVISOR_NAME "xen_hypervisor" +#define MODULE_CUSTOM_COMPATIBLE "multiboot,module" + +/* This maximum size is defined in Power.org ePAPR V1.1 + * https://www.power.org/documentation/epapr-version-1-1/ + * 2.2.1.1 Node Name Requirements + * node-name@unit-address + * 31 + 1(@) + 16(64bit address in hex format) + 1(\0) = 49 + */ +#define FDT_NODE_NAME_MAX_SIZE (49) + +struct compat_string_struct +{ + grub_size_t size; + const char *compat_string; +}; +typedef struct compat_string_struct compat_string_struct_t; +#define FDT_COMPATIBLE(x) {.size = sizeof(x), .compat_string = (x)} + +enum module_type +{ + MODULE_IMAGE, + MODULE_INITRD, + MODULE_XSM, + MODULE_CUSTOM +}; +typedef enum module_type module_type_t; + +struct xen_hypervisor_header +{ + struct linux_arm64_kernel_header efi_head; + + /* This is always PE\0\0. */ + grub_uint8_t signature[GRUB_PE32_SIGNATURE_SIZE]; + /* The COFF file header. */ + struct grub_pe32_coff_header coff_header; + /* The Optional header. */ + struct grub_pe64_optional_header optional_header; +}; + +struct xen_boot_binary +{ + struct xen_boot_binary *next; + struct xen_boot_binary **prev; + int is_hypervisor; + + grub_addr_t start; + grub_size_t size; + grub_size_t align; + + char *cmdline; + int cmdline_size; +}; + +static grub_dl_t my_mod; + +static int loaded; + +static struct xen_boot_binary *xen_hypervisor; +static struct xen_boot_binary *module_head; + +static __inline grub_addr_t +xen_boot_address_align (grub_addr_t start, grub_size_t align) +{ + return (align ? (ALIGN_UP (start, align)) : start); +} + +static grub_err_t +prepare_xen_hypervisor_params (void *xen_boot_fdt) +{ + int chosen_node = 0; + int retval; + + chosen_node = grub_fdt_find_subnode (xen_boot_fdt, 0, "chosen"); + if (chosen_node < 0) + chosen_node = grub_fdt_add_subnode (xen_boot_fdt, 0, "chosen"); + if (chosen_node < 1) + return grub_error (GRUB_ERR_IO, "failed to get chosen node in FDT"); + + /* + * The address and size are always written using 64-bits value. Set + * #address-cells and #size-cells accordingly. + */ + retval = grub_fdt_set_prop32 (xen_boot_fdt, chosen_node, "#address-cells", 2); + if (retval) + return grub_error (GRUB_ERR_IO, "failed to set #address-cells"); + retval = grub_fdt_set_prop32 (xen_boot_fdt, chosen_node, "#size-cells", 2); + if (retval) + return grub_error (GRUB_ERR_IO, "failed to set #size-cells"); + + grub_dprintf ("xen_loader", + "Xen Hypervisor cmdline : %s @ %p size:%d\n", + xen_hypervisor->cmdline, xen_hypervisor->cmdline, + xen_hypervisor->cmdline_size); + + retval = grub_fdt_set_prop (xen_boot_fdt, chosen_node, "bootargs", + xen_hypervisor->cmdline, + xen_hypervisor->cmdline_size); + if (retval) + return grub_error (GRUB_ERR_IO, "failed to install/update FDT"); + + return GRUB_ERR_NONE; +} + +static grub_err_t +prepare_xen_module_params (struct xen_boot_binary *module, void *xen_boot_fdt) +{ + int retval, chosen_node = 0, module_node = 0; + char module_name[FDT_NODE_NAME_MAX_SIZE]; + + retval = grub_snprintf (module_name, FDT_NODE_NAME_MAX_SIZE, "module@%lx", + xen_boot_address_align (module->start, + module->align)); + grub_dprintf ("xen_loader", "Module node name %s \n", module_name); + + if (retval < (int) sizeof ("module@")) + return grub_error (GRUB_ERR_IO, N_("failed to get FDT")); + + chosen_node = grub_fdt_find_subnode (xen_boot_fdt, 0, "chosen"); + if (chosen_node < 0) + chosen_node = grub_fdt_add_subnode (xen_boot_fdt, 0, "chosen"); + if (chosen_node < 1) + return grub_error (GRUB_ERR_IO, "failed to get chosen node in FDT"); + + module_node = + grub_fdt_find_subnode (xen_boot_fdt, chosen_node, module_name); + if (module_node < 0) + module_node = + grub_fdt_add_subnode (xen_boot_fdt, chosen_node, module_name); + + retval = grub_fdt_set_prop (xen_boot_fdt, module_node, "compatible", + MODULE_CUSTOM_COMPATIBLE, sizeof(MODULE_CUSTOM_COMPATIBLE)); + if (retval) + return grub_error (GRUB_ERR_IO, "failed to update FDT"); + + grub_dprintf ("xen_loader", "Module\n"); + + retval = grub_fdt_set_reg64 (xen_boot_fdt, module_node, + xen_boot_address_align (module->start, + module->align), + module->size); + if (retval) + return grub_error (GRUB_ERR_IO, "failed to update FDT"); + + if (module->cmdline && module->cmdline_size > 0) + { + grub_dprintf ("xen_loader", + "Module cmdline : %s @ %p size:%d\n", + module->cmdline, module->cmdline, module->cmdline_size); + + retval = grub_fdt_set_prop (xen_boot_fdt, module_node, "bootargs", + module->cmdline, module->cmdline_size + 1); + if (retval) + return grub_error (GRUB_ERR_IO, "failed to update FDT"); + } + else + { + grub_dprintf ("xen_loader", "Module has no bootargs!\n"); + } + + return GRUB_ERR_NONE; +} + +static grub_err_t +finalize_params_xen_boot (void) +{ + struct xen_boot_binary *module; + void *xen_boot_fdt; + grub_size_t additional_size = 0x1000; + + /* Hypervisor. */ + additional_size += FDT_NODE_NAME_MAX_SIZE + xen_hypervisor->cmdline_size; + FOR_LIST_ELEMENTS (module, module_head) + { + additional_size += 6 * FDT_NODE_NAME_MAX_SIZE + sizeof(MODULE_CUSTOM_COMPATIBLE) - 1 + + module->cmdline_size; + } + + xen_boot_fdt = grub_fdt_load (additional_size); + if (!xen_boot_fdt) + return grub_error (GRUB_ERR_IO, "failed to get FDT"); + + if (xen_hypervisor) + { + if (prepare_xen_hypervisor_params (xen_boot_fdt) != GRUB_ERR_NONE) + goto fail; + } + else + { + grub_dprintf ("xen_loader", "Failed to get Xen Hypervisor info!\n"); + goto fail; + } + + /* Set module params info */ + FOR_LIST_ELEMENTS (module, module_head) + { + if (module->start && module->size > 0) + { + grub_dprintf ("xen_loader", "Module @ 0x%lx size:0x%lx\n", + xen_boot_address_align (module->start, module->align), + module->size); + if (prepare_xen_module_params (module, xen_boot_fdt) != GRUB_ERR_NONE) + goto fail; + } + else + { + grub_dprintf ("xen_loader", "Module info error!\n"); + goto fail; + } + } + + if (grub_fdt_install() == GRUB_ERR_NONE) + return GRUB_ERR_NONE; + +fail: + grub_fdt_unload (); + + return grub_error (GRUB_ERR_IO, "failed to install/update FDT"); +} + + +static grub_err_t +xen_boot (void) +{ + grub_err_t err = finalize_params_xen_boot (); + if (err) + return err; + + return grub_arch_efi_linux_boot_image (xen_hypervisor->start, + xen_hypervisor->size, + xen_hypervisor->cmdline); +} + +static void +single_binary_unload (struct xen_boot_binary *binary) +{ + if (!binary) + return; + + if (binary->start && binary->size > 0) + { + grub_efi_free_pages ((grub_efi_physical_address_t) binary->start, + GRUB_EFI_BYTES_TO_PAGES (binary->size + binary->align)); + } + + if (binary->cmdline && binary->cmdline_size > 0) + { + grub_free (binary->cmdline); + grub_dprintf ("xen_loader", + "Module cmdline memory free @ %p size: %d\n", + binary->cmdline, binary->cmdline_size); + } + + if (!binary->is_hypervisor) + grub_list_remove (GRUB_AS_LIST (binary)); + + grub_dprintf ("xen_loader", + "Module struct memory free @ %p size: 0x%lx\n", + binary, sizeof (binary)); + grub_free (binary); + + return; +} + +static void +all_binaries_unload (void) +{ + struct xen_boot_binary *binary; + + FOR_LIST_ELEMENTS (binary, module_head) + { + single_binary_unload (binary); + } + + if (xen_hypervisor) + single_binary_unload (xen_hypervisor); + + return; +} + +static grub_err_t +xen_unload (void) +{ + loaded = 0; + all_binaries_unload (); + grub_fdt_unload (); + grub_dl_unref (my_mod); + + return GRUB_ERR_NONE; +} + +static void +xen_boot_binary_load (struct xen_boot_binary *binary, grub_file_t file, + int argc, char *argv[]) +{ + binary->size = grub_file_size (file); + grub_dprintf ("xen_loader", "Xen_boot file size: 0x%lx\n", binary->size); + + binary->start + = (grub_addr_t) grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES + (binary->size + + binary->align)); + if (!binary->start) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory")); + return; + } + + grub_dprintf ("xen_loader", "Xen_boot numpages: 0x%lx\n", + GRUB_EFI_BYTES_TO_PAGES (binary->size + binary->align)); + + if (grub_file_read (file, (void *) xen_boot_address_align (binary->start, + binary->align), + binary->size) != (grub_ssize_t) binary->size) + { + single_binary_unload (binary); + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), argv[0]); + return; + } + + if (argc > 1) + { + binary->cmdline_size = grub_loader_cmdline_size (argc - 1, argv + 1); + binary->cmdline = grub_zalloc (binary->cmdline_size); + if (!binary->cmdline) + { + single_binary_unload (binary); + grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory")); + return; + } + grub_create_loader_cmdline (argc - 1, argv + 1, binary->cmdline, + binary->cmdline_size, + GRUB_VERIFY_KERNEL_CMDLINE); + grub_dprintf ("xen_loader", + "Xen_boot cmdline @ %p %s, size: %d\n", + binary->cmdline, binary->cmdline, binary->cmdline_size); + } + else + { + binary->cmdline_size = 0; + binary->cmdline = NULL; + } + + grub_errno = GRUB_ERR_NONE; + return; +} + +static grub_err_t +grub_cmd_xen_module (grub_command_t cmd __attribute__((unused)), + int argc, char *argv[]) +{ + + struct xen_boot_binary *module = NULL; + grub_file_t file = 0; + int nounzip = 0; + + if (!argc) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + if (grub_strcmp (argv[0], "--nounzip") == 0) + { + argv++; + argc--; + nounzip = 1; + } + + if (!argc) + { + 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 Xen Hypervisor first")); + goto fail; + } + + module = + (struct xen_boot_binary *) grub_zalloc (sizeof (struct xen_boot_binary)); + if (!module) + return grub_errno; + + module->is_hypervisor = 0; + module->align = 4096; + + grub_dprintf ("xen_loader", "Init module and node info\n"); + + file = grub_file_open (argv[0], GRUB_FILE_TYPE_XEN_MODULE + | (nounzip ? GRUB_FILE_TYPE_NO_DECOMPRESS + : GRUB_FILE_TYPE_NONE)); + if (!file) + goto fail; + + xen_boot_binary_load (module, file, argc, argv); + if (grub_errno == GRUB_ERR_NONE) + grub_list_push (GRUB_AS_LIST_P (&module_head), GRUB_AS_LIST (module)); + + fail: + if (file) + grub_file_close (file); + if (grub_errno != GRUB_ERR_NONE) + single_binary_unload (module); + + return grub_errno; +} + +static grub_err_t +grub_cmd_xen_hypervisor (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + struct xen_hypervisor_header sh; + grub_file_t file = NULL; + + grub_dl_ref (my_mod); + + if (!argc) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + file = grub_file_open (argv[0], GRUB_FILE_TYPE_XEN_HYPERVISOR); + if (!file) + goto fail; + + if (grub_file_read (file, &sh, sizeof (sh)) != (long) sizeof (sh)) + goto fail; + if (grub_arch_efi_linux_check_image + ((struct linux_arch_kernel_header *) &sh) != GRUB_ERR_NONE) + goto fail; + grub_file_seek (file, 0); + + /* if another module has called grub_loader_set, + we need to make sure that another module is unloaded properly */ + grub_loader_unset (); + + xen_hypervisor = + (struct xen_boot_binary *) grub_zalloc (sizeof (struct xen_boot_binary)); + if (!xen_hypervisor) + return grub_errno; + + xen_hypervisor->is_hypervisor = 1; + xen_hypervisor->align = (grub_size_t) sh.optional_header.section_alignment; + + xen_boot_binary_load (xen_hypervisor, file, argc, argv); + if (grub_errno == GRUB_ERR_NONE) + { + grub_loader_set (xen_boot, xen_unload, 0); + loaded = 1; + } + +fail: + if (file) + grub_file_close (file); + if (grub_errno != GRUB_ERR_NONE) + { + loaded = 0; + all_binaries_unload (); + grub_dl_unref (my_mod); + } + + return grub_errno; +} + +static grub_command_t cmd_xen_hypervisor; +static grub_command_t cmd_xen_module; + +GRUB_MOD_INIT (xen_boot) +{ + cmd_xen_hypervisor = + grub_register_command ("xen_hypervisor", grub_cmd_xen_hypervisor, 0, + N_("Load a xen hypervisor.")); + cmd_xen_module = + grub_register_command ("xen_module", grub_cmd_xen_module, 0, + N_("Load a xen module.")); + my_mod = mod; +} + +GRUB_MOD_FINI (xen_boot) +{ + grub_unregister_command (cmd_xen_hypervisor); + grub_unregister_command (cmd_xen_module); +} |