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-rw-r--r--common/efi/efi-image.c293
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diff --git a/common/efi/efi-image.c b/common/efi/efi-image.c
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+/*
+ * efi-image.c - barebox EFI payload support
+ *
+ * Copyright (c) 2014 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <clock.h>
+#include <common.h>
+#include <linux/sizes.h>
+#include <memory.h>
+#include <command.h>
+#include <magicvar.h>
+#include <init.h>
+#include <driver.h>
+#include <io.h>
+#include <efi.h>
+#include <malloc.h>
+#include <string.h>
+#include <linux/err.h>
+#include <boot.h>
+#include <bootm.h>
+#include <fs.h>
+#include <libfile.h>
+#include <binfmt.h>
+#include <wchar.h>
+#include <efi/efi.h>
+#include <efi/efi-device.h>
+
+struct linux_kernel_header {
+ /* first sector of the image */
+ uint8_t code1[0x0020];
+ uint16_t cl_magic; /**< Magic number 0xA33F */
+ uint16_t cl_offset; /**< The offset of command line */
+ uint8_t code2[0x01F1 - 0x0020 - 2 - 2];
+ uint8_t setup_sects; /**< The size of the setup in sectors */
+ uint16_t root_flags; /**< If the root is mounted readonly */
+ uint16_t syssize; /**< obsolete */
+ uint16_t swap_dev; /**< obsolete */
+ uint16_t ram_size; /**< obsolete */
+ uint16_t vid_mode; /**< Video mode control */
+ uint16_t root_dev; /**< Default root device number */
+ uint16_t boot_flag; /**< 0xAA55 magic number */
+
+ /* second sector of the image */
+ uint16_t jump; /**< Jump instruction (this is code!) */
+ uint32_t header; /**< Magic signature "HdrS" */
+ uint16_t version; /**< Boot protocol version supported */
+ uint32_t realmode_swtch; /**< Boot loader hook */
+ uint16_t start_sys; /**< The load-low segment (obsolete) */
+ uint16_t kernel_version; /**< Points to kernel version string */
+ uint8_t type_of_loader; /**< Boot loader identifier */
+ uint8_t loadflags; /**< Boot protocol option flags */
+ uint16_t setup_move_size; /**< Move to high memory size */
+ uint32_t code32_start; /**< Boot loader hook */
+ uint32_t ramdisk_image; /**< initrd load address */
+ uint32_t ramdisk_size; /**< initrd size */
+ uint32_t bootsect_kludge; /**< obsolete */
+ uint16_t heap_end_ptr; /**< Free memory after setup end */
+ uint8_t ext_loader_ver; /**< boot loader's extension of the version number */
+ uint8_t ext_loader_type; /**< boot loader's extension of its type */
+ uint32_t cmd_line_ptr; /**< Points to the kernel command line */
+ uint32_t initrd_addr_max; /**< Highest address for initrd */
+ uint32_t kernel_alignment; /**< Alignment unit required by the kernel */
+ uint8_t relocatable_kernel; /** */
+ uint8_t min_alignment; /** */
+ uint16_t xloadflags; /** */
+ uint32_t cmdline_size; /** */
+ uint32_t hardware_subarch; /** */
+ uint64_t hardware_subarch_data; /** */
+ uint32_t payload_offset; /** */
+ uint32_t payload_length; /** */
+ uint64_t setup_data; /** */
+ uint64_t pref_address; /** */
+ uint32_t init_size; /** */
+ uint32_t handover_offset; /** */
+} __attribute__ ((packed));
+
+int efi_load_image(const char *file, efi_loaded_image_t **loaded_image,
+ efi_handle_t *h)
+{
+ void *exe;
+ size_t size;
+ efi_handle_t handle;
+ efi_status_t efiret = EFI_SUCCESS;
+
+ exe = read_file(file, &size);
+ if (!exe)
+ return -EINVAL;
+
+ efiret = BS->load_image(false, efi_parent_image, efi_device_path, exe, size,
+ &handle);
+ if (EFI_ERROR(efiret)) {
+ pr_err("failed to LoadImage: %s\n", efi_strerror(efiret));
+ goto out;
+ };
+
+ efiret = BS->open_protocol(handle, &efi_loaded_image_protocol_guid,
+ (void **)loaded_image,
+ efi_parent_image, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if (EFI_ERROR(efiret)) {
+ pr_err("failed to OpenProtocol: %s\n", efi_strerror(efiret));
+ BS->unload_image(handle);
+ goto out;
+ }
+
+ *h = handle;
+out:
+ memset(exe, 0, size);
+ free(exe);
+ return -efi_errno(efiret);
+}
+
+static int efi_execute_image(const char *file)
+{
+ efi_handle_t handle;
+ efi_loaded_image_t *loaded_image;
+ efi_status_t efiret;
+ struct linux_kernel_header *image_header;
+ const char *options;
+ bool is_driver;
+ int ret;
+
+ ret = efi_load_image(file, &loaded_image, &handle);
+ if (ret)
+ return ret;
+
+ is_driver = (loaded_image->image_code_type == EFI_BOOT_SERVICES_CODE) ||
+ (loaded_image->image_code_type == EFI_RUNTIME_SERVICES_CODE);
+
+ image_header = (struct linux_kernel_header *)loaded_image->image_base;
+ if (image_header->boot_flag == 0xAA55 &&
+ image_header->header == 0x53726448) {
+ pr_debug("Linux kernel detected. Adding bootargs.");
+ options = linux_bootargs_get();
+ pr_err("add linux options '%s'\n", options);
+ loaded_image->load_options = xstrdup_char_to_wchar(options);
+ loaded_image->load_options_size =
+ (strlen(options) + 1) * sizeof(wchar_t);
+ shutdown_barebox();
+ }
+
+ efiret = BS->start_image(handle, NULL, NULL);
+ if (EFI_ERROR(efiret))
+ pr_err("failed to StartImage: %s\n", efi_strerror(efiret));
+
+ if (!is_driver)
+ BS->unload_image(handle);
+
+ efi_connect_all();
+ efi_register_devices();
+
+ return -efi_errno(efiret);
+}
+
+#ifdef __x86_64__
+typedef void(*handover_fn)(void *image, efi_system_table_t *table,
+ struct linux_kernel_header *header);
+
+static inline void linux_efi_handover(efi_handle_t handle,
+ struct linux_kernel_header *header)
+{
+ handover_fn handover;
+
+ asm volatile ("cli");
+ handover = (handover_fn)((long)header->code32_start + 512 +
+ header->handover_offset);
+ handover(handle, efi_sys_table, header);
+}
+#else
+typedef void(*handover_fn)(VOID *image, EFI_SYSTEM_TABLE *table,
+ struct SetupHeader *setup) __attribute__((regparm(0)));
+
+static inline void linux_efi_handover(efi_handle_t handle,
+ struct linux_kernel_header *header)
+{
+ handover_fn handover;
+
+ handover = (handover_fn)((long)header->code32_start +
+ header->handover_offset);
+ handover(handle, efi_sys_table, header);
+}
+#endif
+
+static int do_bootm_efi(struct image_data *data)
+{
+ void *tmp;
+ void *initrd = NULL;
+ size_t size;
+ efi_handle_t handle;
+ int ret;
+ const char *options;
+ efi_loaded_image_t *loaded_image;
+ struct linux_kernel_header *image_header, *boot_header;
+
+ ret = efi_load_image(data->os_file, &loaded_image, &handle);
+ if (ret)
+ return ret;
+
+ image_header = (struct linux_kernel_header *)loaded_image->image_base;
+
+ if (image_header->boot_flag != 0xAA55 ||
+ image_header->header != 0x53726448 ||
+ image_header->version < 0x20b ||
+ !image_header->relocatable_kernel) {
+ pr_err("Not a valid kernel image!\n");
+ BS->unload_image(handle);
+ return -EINVAL;
+ }
+
+ boot_header = xmalloc(0x4000);
+ memset(boot_header, 0, 0x4000);
+ memcpy(boot_header, image_header, sizeof(*image_header));
+
+ boot_header->type_of_loader = 0xff;
+
+ if (data->initrd_file) {
+ tmp = read_file(data->initrd_file, &size);
+ initrd = xmemalign(PAGE_SIZE, PAGE_ALIGN(size));
+ memcpy(initrd, tmp, size);
+ memset(initrd + size, 0, PAGE_ALIGN(size) - size);
+ free(tmp);
+ boot_header->ramdisk_image = (uint64_t)initrd;
+ boot_header->ramdisk_size = PAGE_ALIGN(size);
+ }
+
+ options = linux_bootargs_get();
+ boot_header->cmd_line_ptr = (uint64_t)options;
+ boot_header->cmdline_size = strlen(options);
+
+ boot_header->code32_start = (uint64_t)loaded_image->image_base +
+ (image_header->setup_sects+1) * 512;
+
+ if (bootm_verbose(data)) {
+ printf("\nStarting kernel at 0x%p", loaded_image->image_base);
+ if (data->initrd_file)
+ printf(", initrd at 0x%08x",
+ boot_header->ramdisk_image);
+ printf("...\n");
+ }
+
+ if (data->dryrun) {
+ BS->unload_image(handle);
+ free(boot_header);
+ free(initrd);
+ return 0;
+ }
+
+ efi_set_variable_usec("LoaderTimeExecUSec", &efi_systemd_vendor_guid,
+ get_time_ns()/1000);
+
+ shutdown_barebox();
+ linux_efi_handover(handle, boot_header);
+
+ return 0;
+}
+
+static struct image_handler efi_handle_tr = {
+ .name = "EFI Application",
+ .bootm = do_bootm_efi,
+ .filetype = filetype_exe,
+};
+
+static int efi_execute(struct binfmt_hook *b, char *file, int argc, char **argv)
+{
+ return efi_execute_image(file);
+}
+
+static struct binfmt_hook binfmt_efi_hook = {
+ .type = filetype_exe,
+ .hook = efi_execute,
+};
+
+static int efi_register_image_handler(void)
+{
+ register_image_handler(&efi_handle_tr);
+ binfmt_register(&binfmt_efi_hook);
+
+ return 0;
+}
+late_initcall(efi_register_image_handler);