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Sun, 05 Oct 2025 21:15:25 -0700 (PDT) Received: from Latitude-7490.ht.home ([2607:fa49:8c41:2600:1608:a712:ade2:2b30]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4e55cadcecdsm119506221cf.23.2025.10.05.21.15.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Oct 2025 21:15:25 -0700 (PDT) From: chalianis1@gmail.com To: s.hauer@pengutronix.de Cc: barebox@lists.infradead.org, Chali Anis , Ahmad Fatoum Date: Mon, 6 Oct 2025 00:15:08 -0400 Message-Id: <20251006041512.1360284-7-chalianis1@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251006041512.1360284-1-chalianis1@gmail.com> References: <20251006041512.1360284-1-chalianis1@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251005_211527_013294_FE175CBF X-CRM114-Status: GOOD ( 26.78 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.6 required=4.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 07/11] efi: payload: split image handling from legacy handover boot X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) From: Chali Anis The handover boot support is Linux-specific and can be disabled with CONFIG_EFI_HANDOVER_PROTOCOL. In preparation for adding a compliant boot method, move the handover-specific parts into their own file. Signed-off-by: Ahmad Fatoum Signed-off-by: Chali Anis --- efi/payload/Kconfig | 5 + efi/payload/Makefile | 1 + efi/payload/handover.c | 154 +++++++++++++++++++++++++++++ efi/payload/image.c | 192 +++++-------------------------------- efi/payload/image.h | 14 +++ efi/payload/setup_header.h | 63 ++++++++++++ 6 files changed, 260 insertions(+), 169 deletions(-) create mode 100644 efi/payload/handover.c create mode 100644 efi/payload/image.h create mode 100644 efi/payload/setup_header.h diff --git a/efi/payload/Kconfig b/efi/payload/Kconfig index a403acc81a93..d0a46704a6b9 100644 --- a/efi/payload/Kconfig +++ b/efi/payload/Kconfig @@ -25,4 +25,9 @@ if EFI_PAYLOAD config EFI_STUB def_bool HAVE_EFI_STUB +config EFI_HANDOVER_PROTOCOL + bool "EFI Handover protocol" + default y + depends on X86 + endif diff --git a/efi/payload/Makefile b/efi/payload/Makefile index 1250535302d3..d8b577bf3e23 100644 --- a/efi/payload/Makefile +++ b/efi/payload/Makefile @@ -2,6 +2,7 @@ obj-y += init.o obj-y += image.o +obj-$(CONFIG_EFI_HANDOVER_PROTOCOL) += handover.o obj-y += efi-initrd.o obj-$(CONFIG_OFTREE) += fdt.o bbenv-y += env-efi diff --git a/efi/payload/handover.c b/efi/payload/handover.c new file mode 100644 index 000000000000..82f4cb4f5286 --- /dev/null +++ b/efi/payload/handover.c @@ -0,0 +1,154 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * handover.c - legacy x86 EFI handover protocol + * + * Copyright (c) 2014 Sascha Hauer , Pengutronix + */ + +#define pr_fmt(fmt) "efi-handover: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "image.h" +#include "setup_header.h" + +static int efi_do_execute_image(enum filetype filetype, const char *file) +{ + efi_handle_t handle; + struct efi_loaded_image *loaded_image; + int ret; + + ret = efi_load_image(file, &loaded_image, &handle); + if (ret) + return ret; + + return efi_execute_image(handle, loaded_image, filetype); +} + +typedef void(*handover_fn)(void *image, struct efi_system_table *table, + struct x86_setup_header *header); + +static inline void linux_efi_handover(efi_handle_t handle, + struct x86_setup_header *header) +{ + handover_fn handover; + uintptr_t addr; + + addr = header->code32_start + header->handover_offset; + if (IS_ENABLED(CONFIG_X86_64)) + addr += 512; + + handover = efi_phys_to_virt(addr); + handover(handle, efi_sys_table, header); +} + +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; + struct efi_loaded_image *loaded_image; + struct x86_setup_header *image_header, *boot_header; + + ret = efi_load_image(data->os_file, &loaded_image, &handle); + if (ret) + return ret; + + image_header = (struct x86_setup_header *)loaded_image->image_base; + + if (!is_x86_setup_header(image_header) || + 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)); + + /* Refer to Linux kernel commit a27e292b8a54 + * ("Documentation/x86/boot: Reserve type_of_loader=13 for barebox") + */ + boot_header->type_of_loader = 0x13; + + 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 = efi_virt_to_phys(initrd); + boot_header->ramdisk_size = PAGE_ALIGN(size); + } + + options = linux_bootargs_get(); + if (options) { + boot_header->cmd_line_ptr = efi_virt_to_phys(options); + boot_header->cmdline_size = strlen(options); + } + + boot_header->code32_start = efi_virt_to_phys(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, + ktime_to_us(ktime_get())); + + 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_register_handover_handler(void) +{ + register_image_handler(&efi_handle_tr); + return 0; +} +late_efi_initcall(efi_register_handover_handler); diff --git a/efi/payload/image.c b/efi/payload/image.c index 33c5e18dac27..ae7678188d84 100644 --- a/efi/payload/image.c +++ b/efi/payload/image.c @@ -5,13 +5,12 @@ * Copyright (c) 2014 Sascha Hauer , Pengutronix */ +#define pr_fmt(fmt) "efi-image: " fmt + #include #include #include -#include #include -#include -#include #include #include #include @@ -19,7 +18,7 @@ #include #include #include -#include +#include #include #include #include @@ -28,54 +27,8 @@ #include #include -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)); +#include "image.h" +#include "setup_header.h" static void *efi_read_file(const char *file, size_t *size) { @@ -85,10 +38,6 @@ static void *efi_read_file(const char *file, size_t *size) char *buf; ssize_t ret; - buf = read_file(file, size); - if (buf || errno != ENOMEM) - return buf; - ret = stat(file, &s); if (ret) return NULL; @@ -122,8 +71,8 @@ static void efi_free_file(void *_mem, size_t size) BS->free_pages(mem, DIV_ROUND_UP(size, EFI_PAGE_SIZE)); } -static int efi_load_image(const char *file, struct efi_loaded_image **loaded_image, - efi_handle_t *h) +int efi_load_image(const char *file, struct efi_loaded_image **loaded_image, + efi_handle_t *h) { void *exe; size_t size; @@ -158,10 +107,7 @@ static int efi_load_image(const char *file, struct efi_loaded_image **loaded_ima static bool is_linux_image(enum filetype filetype, const void *base) { - const struct linux_kernel_header *hdr = base; - - if (IS_ENABLED(CONFIG_X86) && - hdr->boot_flag == 0xAA55 && hdr->header == 0x53726448) + if (IS_ENABLED(CONFIG_X86) && is_x86_setup_header(base)) return true; if (IS_ENABLED(CONFIG_ARM64) && @@ -171,18 +117,13 @@ static bool is_linux_image(enum filetype filetype, const void *base) return false; } -static int efi_execute_image(enum filetype filetype, const char *file) +int efi_execute_image(efi_handle_t handle, + struct efi_loaded_image *loaded_image, + enum filetype filetype) { - efi_handle_t handle; - struct efi_loaded_image *loaded_image; efi_status_t efiret; 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); @@ -216,110 +157,17 @@ static int efi_execute_image(enum filetype filetype, const char *file) return -efi_errno(efiret); } -typedef void(*handover_fn)(void *image, struct efi_system_table *table, - struct linux_kernel_header *header); - -static inline void linux_efi_handover(efi_handle_t handle, - struct linux_kernel_header *header) -{ - handover_fn handover; - uintptr_t addr; - - addr = header->code32_start + header->handover_offset; - if (IS_ENABLED(CONFIG_X86_64)) - addr += 512; - - handover = efi_phys_to_virt(addr); - handover(handle, efi_sys_table, header); -} - -static int do_bootm_efi(struct image_data *data) +static int efi_execute(struct binfmt_hook *b, char *file, int argc, char **argv) { - void *tmp; - void *initrd = NULL; - size_t size; + struct efi_loaded_image *loaded_image; efi_handle_t handle; int ret; - const char *options; - struct efi_loaded_image *loaded_image; - struct linux_kernel_header *image_header, *boot_header; - ret = efi_load_image(data->os_file, &loaded_image, &handle); + ret = efi_load_image(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)); - - /* Refer to Linux kernel commit a27e292b8a54 - * ("Documentation/x86/boot: Reserve type_of_loader=13 for barebox") - */ - boot_header->type_of_loader = 0x13; - - 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 = efi_virt_to_phys(initrd); - boot_header->ramdisk_size = PAGE_ALIGN(size); - } - - options = linux_bootargs_get(); - if (options) { - boot_header->cmd_line_ptr = efi_virt_to_phys(options); - boot_header->cmdline_size = strlen(options); - } - - boot_header->code32_start = efi_virt_to_phys(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, - ktime_to_us(ktime_get())); - - 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(b->type, file); + return efi_execute_image(handle, loaded_image, b->type); } static struct binfmt_hook binfmt_efi_hook = { @@ -352,13 +200,19 @@ static struct binfmt_hook binfmt_arm64_efi_hook = { .hook = efi_execute, }; +static struct binfmt_hook binfmt_x86_efi_hook = { + .type = filetype_x86_linux_image, + .hook = efi_execute, +}; + static int efi_register_image_handler(void) { - register_image_handler(&efi_handle_tr); binfmt_register(&binfmt_efi_hook); - if (IS_ENABLED(CONFIG_X86)) + if (IS_ENABLED(CONFIG_X86)) { register_image_handler(&non_efi_handle_linux_x86); + binfmt_register(&binfmt_x86_efi_hook); + } if (IS_ENABLED(CONFIG_ARM64)) binfmt_register(&binfmt_arm64_efi_hook); diff --git a/efi/payload/image.h b/efi/payload/image.h new file mode 100644 index 000000000000..673b21db839a --- /dev/null +++ b/efi/payload/image.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __EFI_PAYLOAD_IMAGE_H__ +#define __EFI_PAYLOAD_IMAGE_H__ + +#include + +int efi_load_image(const char *file, struct efi_loaded_image **loaded_image, + efi_handle_t *h); + +int efi_execute_image(efi_handle_t handle, + struct efi_loaded_image *loaded_image, + enum filetype filetype); + +#endif diff --git a/efi/payload/setup_header.h b/efi/payload/setup_header.h new file mode 100644 index 000000000000..4f094b844415 --- /dev/null +++ b/efi/payload/setup_header.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __EFI_PAYLOAD_SETUP_HEADER_H__ +#define __EFI_PAYLOAD_SETUP_HEADER_H__ + +#include + +struct x86_setup_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)); + +static inline bool is_x86_setup_header(const void *base) +{ + const struct x86_setup_header *hdr = base; + + return hdr->boot_flag == 0xAA55 && hdr->header == 0x53726448; +} + +#endif -- 2.34.1