In the prior commits, interfaces for executing EFI binary or boot manager
were carved out. Move them under efi_loader directory so that they can
be called from other places without depending on bootefi command.
Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
---
cmd/bootefi.c | 546 ++---------------------------------
include/efi_loader.h | 10 +
lib/efi_loader/efi_bootmgr.c | 517 +++++++++++++++++++++++++++++++++
3 files changed, 551 insertions(+), 522 deletions(-)
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 8b0bd07f1ff8..9cf9027bf409 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -7,531 +7,22 @@
#define LOG_CATEGORY LOGC_EFI
-#include <common.h>
-#include <bootm.h>
-#include <charset.h>
#include <command.h>
-#include <dm.h>
+#include <efi.h>
#include <efi_loader.h>
-#include <efi_selftest.h>
-#include <env.h>
-#include <errno.h>
-#include <image.h>
+#include <exports.h>
#include <log.h>
#include <malloc.h>
-#include <asm/global_data.h>
-#include <linux/libfdt.h>
-#include <linux/libfdt_env.h>
#include <mapmem.h>
-#include <memalign.h>
+#include <vsprintf.h>
#include <asm-generic/sections.h>
-#include <linux/linkage.h>
+#include <asm/global_data.h>
+#include <linux/string.h>
DECLARE_GLOBAL_DATA_PTR;
-static struct efi_device_path *bootefi_image_path;
-static struct efi_device_path *bootefi_device_path;
-static void *image_addr;
-static size_t image_size;
-
-/**
- * efi_get_image_parameters() - return image parameters
- *
- * @img_addr: address of loaded image in memory
- * @img_size: size of loaded image
- */
-void efi_get_image_parameters(void **img_addr, size_t *img_size)
-{
- *img_addr = image_addr;
- *img_size = image_size;
-}
-
-/**
- * efi_clear_bootdev() - clear boot device
- */
-static void efi_clear_bootdev(void)
-{
- efi_free_pool(bootefi_device_path);
- efi_free_pool(bootefi_image_path);
- bootefi_device_path = NULL;
- bootefi_image_path = NULL;
- image_addr = NULL;
- image_size = 0;
-}
-
-/**
- * efi_set_bootdev() - set boot device
- *
- * This function is called when a file is loaded, e.g. via the 'load' command.
- * We use the path to this file to inform the UEFI binary about the boot
device.
- *
- * @dev: device, e.g. "MMC"
- * @devnr: number of the device, e.g. "1:2"
- * @path: path to file loaded
- * @buffer: buffer with file loaded
- * @buffer_size: size of file loaded
- */
-void efi_set_bootdev(const char *dev, const char *devnr, const char *path,
- void *buffer, size_t buffer_size)
-{
- struct efi_device_path *device, *image;
- efi_status_t ret;
-
- log_debug("dev=%s, devnr=%s, path=%s, buffer=%p, size=%zx\n", dev,
- devnr, path, buffer, buffer_size);
-
- /* Forget overwritten image */
- if (buffer + buffer_size >= image_addr &&
- image_addr + image_size >= buffer)
- efi_clear_bootdev();
-
- /* Remember only PE-COFF and FIT images */
- if (efi_check_pe(buffer, buffer_size, NULL) != EFI_SUCCESS) {
- if (IS_ENABLED(CONFIG_FIT) &&
- !fit_check_format(buffer, IMAGE_SIZE_INVAL)) {
- /*
- * FIT images of type EFI_OS are started via command
- * bootm. We should not use their boot device with the
- * bootefi command.
- */
- buffer = 0;
- buffer_size = 0;
- } else {
- log_debug("- not remembering image\n");
- return;
- }
- }
-
- /* efi_set_bootdev() is typically called repeatedly, recover memory */
- efi_clear_bootdev();
-
- image_addr = buffer;
- image_size = buffer_size;
-
- ret = efi_dp_from_name(dev, devnr, path, &device, &image);
- if (ret == EFI_SUCCESS) {
- bootefi_device_path = device;
- if (image) {
- /* FIXME: image should not contain device */
- struct efi_device_path *image_tmp = image;
-
- efi_dp_split_file_path(image, &device, &image);
- efi_free_pool(image_tmp);
- }
- bootefi_image_path = image;
- log_debug("- boot device %pD\n", device);
- if (image)
- log_debug("- image %pD\n", image);
- } else {
- log_debug("- efi_dp_from_name() failed, err=%lx\n", ret);
- efi_clear_bootdev();
- }
-}
-
-/**
- * efi_env_set_load_options() - set load options from environment variable
- *
- * @handle: the image handle
- * @env_var: name of the environment variable
- * @load_options: pointer to load options (output)
- * Return: status code
- */
-static efi_status_t efi_env_set_load_options(efi_handle_t handle,
- const char *env_var,
- u16 **load_options)
-{
- const char *env = env_get(env_var);
- size_t size;
- u16 *pos;
- efi_status_t ret;
-
- *load_options = NULL;
- if (!env)
- return EFI_SUCCESS;
- size = sizeof(u16) * (utf8_utf16_strlen(env) + 1);
- pos = calloc(size, 1);
- if (!pos)
- return EFI_OUT_OF_RESOURCES;
- *load_options = pos;
- utf8_utf16_strcpy(&pos, env);
- ret = efi_set_load_options(handle, size, *load_options);
- if (ret != EFI_SUCCESS) {
- free(*load_options);
- *load_options = NULL;
- }
- return ret;
-}
-
-#if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
-
-/**
- * copy_fdt() - Copy the device tree to a new location available to EFI
- *
- * The FDT is copied to a suitable location within the EFI memory map.
- * Additional 12 KiB are added to the space in case the device tree needs to be
- * expanded later with fdt_open_into().
- *
- * @fdtp: On entry a pointer to the flattened device tree.
- * On exit a pointer to the copy of the flattened device tree.
- * FDT start
- * Return: status code
- */
-static efi_status_t copy_fdt(void **fdtp)
-{
- unsigned long fdt_ram_start = -1L, fdt_pages;
- efi_status_t ret = 0;
- void *fdt, *new_fdt;
- u64 new_fdt_addr;
- uint fdt_size;
- int i;
-
- for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
- u64 ram_start = gd->bd->bi_dram[i].start;
- u64 ram_size = gd->bd->bi_dram[i].size;
-
- if (!ram_size)
- continue;
-
- if (ram_start < fdt_ram_start)
- fdt_ram_start = ram_start;
- }
-
- /*
- * Give us at least 12 KiB of breathing room in case the device tree
- * needs to be expanded later.
- */
- fdt = *fdtp;
- fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
- fdt_size = fdt_pages << EFI_PAGE_SHIFT;
-
- ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
- EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
- &new_fdt_addr);
- if (ret != EFI_SUCCESS) {
- log_err("ERROR: Failed to reserve space for FDT\n");
- goto done;
- }
- new_fdt = (void *)(uintptr_t)new_fdt_addr;
- memcpy(new_fdt, fdt, fdt_totalsize(fdt));
- fdt_set_totalsize(new_fdt, fdt_size);
-
- *fdtp = (void *)(uintptr_t)new_fdt_addr;
-done:
- return ret;
-}
-
-/**
- * get_config_table() - get configuration table
- *
- * @guid: GUID of the configuration table
- * Return: pointer to configuration table or NULL
- */
-static void *get_config_table(const efi_guid_t *guid)
-{
- size_t i;
-
- for (i = 0; i < systab.nr_tables; i++) {
- if (!guidcmp(guid, &systab.tables[i].guid))
- return systab.tables[i].table;
- }
- return NULL;
-}
-
-#endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
-
-/**
- * efi_install_fdt() - install device tree
- *
- * If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
- * address will will be installed as configuration table, otherwise the device
- * tree located at the address indicated by environment variable fdt_addr or as
- * fallback fdtcontroladdr will be used.
- *
- * On architectures using ACPI tables device trees shall not be installed as
- * configuration table.
- *
- * @fdt: address of device tree or EFI_FDT_USE_INTERNAL to use the
- * the hardware device tree as indicated by environment variable
- * fdt_addr or as fallback the internal device tree as indicated by
- * the environment variable fdtcontroladdr
- * Return: status code
- */
-efi_status_t efi_install_fdt(void *fdt)
-{
- /*
- * The EBBR spec requires that we have either an FDT or an ACPI table
- * but not both.
- */
-#if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
- if (fdt) {
- log_warning("WARNING: Can't have ACPI table and device tree -
ignoring DT.\n");
- return EFI_SUCCESS;
- }
-#else
- struct bootm_headers img = { 0 };
- efi_status_t ret;
-
- if (fdt == EFI_FDT_USE_INTERNAL) {
- const char *fdt_opt;
- uintptr_t fdt_addr;
-
- /* Look for device tree that is already installed */
- if (get_config_table(&efi_guid_fdt))
- return EFI_SUCCESS;
- /* Check if there is a hardware device tree */
- fdt_opt = env_get("fdt_addr");
- /* Use our own device tree as fallback */
- if (!fdt_opt) {
- fdt_opt = env_get("fdtcontroladdr");
- if (!fdt_opt) {
- log_err("ERROR: need device tree\n");
- return EFI_NOT_FOUND;
- }
- }
- fdt_addr = hextoul(fdt_opt, NULL);
- if (!fdt_addr) {
- log_err("ERROR: invalid $fdt_addr or
$fdtcontroladdr\n");
- return EFI_LOAD_ERROR;
- }
- fdt = map_sysmem(fdt_addr, 0);
- }
-
- /* Install device tree */
- if (fdt_check_header(fdt)) {
- log_err("ERROR: invalid device tree\n");
- return EFI_LOAD_ERROR;
- }
-
- /* Prepare device tree for payload */
- ret = copy_fdt(&fdt);
- if (ret) {
- log_err("ERROR: out of memory\n");
- return EFI_OUT_OF_RESOURCES;
- }
-
- if (image_setup_libfdt(&img, fdt, 0, NULL)) {
- log_err("ERROR: failed to process device tree\n");
- return EFI_LOAD_ERROR;
- }
-
- /* Create memory reservations as indicated by the device tree */
- efi_carve_out_dt_rsv(fdt);
-
- efi_try_purge_kaslr_seed(fdt);
-
- if (CONFIG_IS_ENABLED(EFI_TCG2_PROTOCOL_MEASURE_DTB)) {
- ret = efi_tcg2_measure_dtb(fdt);
- if (ret == EFI_SECURITY_VIOLATION) {
- log_err("ERROR: failed to measure DTB\n");
- return ret;
- }
- }
-
- /* Install device tree as UEFI table */
- ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
- if (ret != EFI_SUCCESS) {
- log_err("ERROR: failed to install device tree\n");
- return ret;
- }
-#endif /* GENERATE_ACPI_TABLE */
-
- return EFI_SUCCESS;
-}
-
-/**
- * do_bootefi_exec() - execute EFI binary
- *
- * The image indicated by @handle is started. When it returns the allocated
- * memory for the @load_options is freed.
- *
- * @handle: handle of loaded image
- * @load_options: load options
- * Return: status code
- *
- * Load the EFI binary into a newly assigned memory unwinding the relocation
- * information, install the loaded image protocol, and call the binary.
- */
-static efi_status_t do_bootefi_exec(efi_handle_t handle, void *load_options)
-{
- efi_status_t ret;
- efi_uintn_t exit_data_size = 0;
- u16 *exit_data = NULL;
-
- /* On ARM switch from EL3 or secure mode to EL2 or non-secure mode */
- switch_to_non_secure_mode();
-
- /*
- * The UEFI standard requires that the watchdog timer is set to five
- * minutes when invoking an EFI boot option.
- *
- * Unified Extensible Firmware Interface (UEFI), version 2.7 Errata A
- * 7.5. Miscellaneous Boot Services - EFI_BOOT_SERVICES.SetWatchdogTimer
- */
- ret = efi_set_watchdog(300);
- if (ret != EFI_SUCCESS) {
- log_err("ERROR: Failed to set watchdog timer\n");
- goto out;
- }
-
- /* Call our payload! */
- ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
- if (ret != EFI_SUCCESS) {
- log_err("## Application failed, r = %lu\n",
- ret & ~EFI_ERROR_MASK);
- if (exit_data) {
- log_err("## %ls\n", exit_data);
- efi_free_pool(exit_data);
- }
- }
-
- efi_restore_gd();
-
-out:
- free(load_options);
-
- if (IS_ENABLED(CONFIG_EFI_LOAD_FILE2_INITRD)) {
- if (efi_initrd_deregister() != EFI_SUCCESS)
- log_err("Failed to remove loadfile2 for initrd\n");
- }
-
- /* Control is returned to U-Boot, disable EFI watchdog */
- efi_set_watchdog(0);
-
- return ret;
-}
-
-/**
- * efi_bootmgr_run() - execute EFI boot manager
- * fdt: Flat device tree
- *
- * Invoke EFI boot manager and execute a binary depending on
- * boot options. If @fdt is not NULL, it will be passed to
- * the executed binary.
- *
- * Return: status code
- */
-static efi_status_t efi_bootmgr_run(void *fdt)
-{
- efi_handle_t handle;
- void *load_options;
- efi_status_t ret;
-
- /* Initialize EFI drivers */
- ret = efi_init_obj_list();
- if (ret != EFI_SUCCESS) {
- log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
- ret & ~EFI_ERROR_MASK);
- return CMD_RET_FAILURE;
- }
-
- ret = efi_install_fdt(fdt);
- if (ret != EFI_SUCCESS)
- return ret;
-
- ret = efi_bootmgr_load(&handle, &load_options);
- if (ret != EFI_SUCCESS) {
- log_notice("EFI boot manager: Cannot load any image\n");
- return ret;
- }
-
- return do_bootefi_exec(handle, load_options);
-}
-
-/**
- * efi_run_image() - run loaded UEFI image
- *
- * @source_buffer: memory address of the UEFI image
- * @source_size: size of the UEFI image
- * Return: status code
- */
-efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
-{
- efi_handle_t mem_handle = NULL, handle;
- struct efi_device_path *file_path = NULL;
- struct efi_device_path *msg_path;
- efi_status_t ret, ret2;
- u16 *load_options;
-
- if (!bootefi_device_path || !bootefi_image_path) {
- log_debug("Not loaded from disk\n");
- /*
- * Special case for efi payload not loaded from disk,
- * such as 'bootefi hello' or for example payload
- * loaded directly into memory via JTAG, etc:
- */
- file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
- (uintptr_t)source_buffer,
- source_size);
- /*
- * Make sure that device for device_path exist
- * in load_image(). Otherwise, shell and grub will fail.
- */
- ret = efi_install_multiple_protocol_interfaces(&mem_handle,
-
&efi_guid_device_path,
- file_path, NULL);
- if (ret != EFI_SUCCESS)
- goto out;
- msg_path = file_path;
- } else {
- file_path = efi_dp_append(bootefi_device_path,
- bootefi_image_path);
- msg_path = bootefi_image_path;
- log_debug("Loaded from disk\n");
- }
-
- log_info("Booting %pD\n", msg_path);
-
- ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
- source_size, &handle));
- if (ret != EFI_SUCCESS) {
- log_err("Loading image failed\n");
- goto out;
- }
-
- /* Transfer environment variable as load options */
- ret = efi_env_set_load_options(handle, "bootargs", &load_options);
- if (ret != EFI_SUCCESS)
- goto out;
-
- ret = do_bootefi_exec(handle, load_options);
-
-out:
- ret2 = efi_uninstall_multiple_protocol_interfaces(mem_handle,
- &efi_guid_device_path,
- file_path, NULL);
- efi_free_pool(file_path);
- return (ret != EFI_SUCCESS) ? ret : ret2;
-}
-
-/**
- * efi_binary_run() - run loaded UEFI image
- *
- * @image: memory address of the UEFI image
- * @size: size of the UEFI image
- *
- * Execute an EFI binary image loaded at @image.
- * @size may be zero if the binary is loaded with U-Boot load command.
- *
- * Return: status code
- */
-static efi_status_t efi_binary_run(void *image, size_t size, void *fdt)
-{
- efi_status_t ret;
-
- /* Initialize EFI drivers */
- ret = efi_init_obj_list();
- if (ret != EFI_SUCCESS) {
- log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
- ret & ~EFI_ERROR_MASK);
- return ret;
- }
-
- ret = efi_install_fdt(fdt);
- if (ret != EFI_SUCCESS)
- return ret;
-
- return efi_run_image(image, size);
-}
+static struct efi_device_path *test_image_path;
+static struct efi_device_path *test_device_path;
static efi_status_t bootefi_run_prepare(const char *load_options_path,
struct efi_device_path *device_path,
@@ -574,23 +65,26 @@ static efi_status_t bootefi_test_prepare
efi_status_t ret;
/* Construct a dummy device path */
- bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
- if (!bootefi_device_path)
+ test_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
+ if (!test_device_path)
return EFI_OUT_OF_RESOURCES;
- bootefi_image_path = efi_dp_from_file(NULL, path);
- if (!bootefi_image_path) {
+ test_image_path = efi_dp_from_file(NULL, path);
+ if (!test_image_path) {
ret = EFI_OUT_OF_RESOURCES;
goto failure;
}
- ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
- bootefi_image_path, image_objp,
+ ret = bootefi_run_prepare(load_options_path, test_device_path,
+ test_image_path, image_objp,
loaded_image_infop);
if (ret == EFI_SUCCESS)
return ret;
failure:
+ efi_free_pool(test_device_path);
+ efi_free_pool(test_image_path);
+ /* TODO: not sure calling clear function is necessary */
efi_clear_bootdev();
return ret;
}
@@ -615,6 +109,8 @@ static int do_efi_selftest(void)
ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
efi_restore_gd();
free(loaded_image_info->load_options);
+ efi_free_pool(test_device_path);
+ efi_free_pool(test_image_path);
if (ret != EFI_SUCCESS)
efi_delete_handle(&image_obj->header);
else
@@ -639,6 +135,8 @@ static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int
argc,
char *p;
void *fdt, *image_buf;
unsigned long addr, size;
+ void *image_addr;
+ size_t image_size;
if (argc < 2)
return CMD_RET_USAGE;
@@ -690,6 +188,7 @@ static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int
argc,
!strcmp(argv[1], "hello")) {
image_buf = __efi_helloworld_begin;
size = __efi_helloworld_end - __efi_helloworld_begin;
+ /* TODO: not sure calling clear function is necessary */
efi_clear_bootdev();
} else {
addr = strtoul(argv[1], NULL, 16);
@@ -705,6 +204,9 @@ static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int
argc,
return CMD_RET_USAGE;
efi_clear_bootdev();
} else {
+ /* Image should be already loaded */
+ efi_get_image_parameters(&image_addr, &image_size);
+
if (image_buf != image_addr) {
log_err("No UEFI binary known at %s\n",
argv[1]);
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 48d4999e56a9..031a8f76846a 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -91,6 +91,8 @@ efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len);
* back to u-boot world
*/
void efi_restore_gd(void);
+/* Call this to unset the current device name */
+void efi_clear_bootdev(void);
/* Call this to set the current device name */
void efi_set_bootdev(const char *dev, const char *devnr, const char *path,
void *buffer, size_t buffer_size);
@@ -115,6 +117,7 @@ static inline efi_status_t efi_add_runtime_mmio(void
*mmio_ptr, u64 len)
/* No loader configured, stub out EFI_ENTRY */
static inline void efi_restore_gd(void) { }
+static inline void efi_clear_bootdev(void) { }
static inline void efi_set_bootdev(const char *dev, const char *devnr,
const char *path, void *buffer,
size_t buffer_size) { }
@@ -526,14 +529,21 @@ efi_status_t efi_bootmgr_get_unused_bootoption(u16 *buf,
efi_status_t efi_bootmgr_update_media_device_boot_option(void);
/* Delete selected boot option */
efi_status_t efi_bootmgr_delete_boot_option(u16 boot_index);
+/* Invoke EFI boot manager */
+efi_status_t efi_bootmgr_run(void *fdt);
/* search the boot option index in BootOrder */
bool efi_search_bootorder(u16 *bootorder, efi_uintn_t num, u32 target, u32
*index);
/* Set up console modes */
void efi_setup_console_size(void);
+/* Set up load options from environment variable */
+efi_status_t efi_env_set_load_options(efi_handle_t handle, const char *env_var,
+ u16 **load_options);
/* Install device tree */
efi_status_t efi_install_fdt(void *fdt);
/* Run loaded UEFI image */
efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size);
+/* Run loaded UEFI image with given fdt */
+efi_status_t efi_binary_run(void *image, size_t size, void *fdt);
/* Initialize variable services */
efi_status_t efi_init_variables(void);
/* Notify ExitBootServices() is called */
diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
index a40762c74c83..cc8d88b4b025 100644
--- a/lib/efi_loader/efi_bootmgr.c
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -3,6 +3,8 @@
* EFI boot manager
*
* Copyright (c) 2017 Rob Clark
+ * For the code moved from cmd/bootefi.c
+ * Copyright (c) 2016 Alexander Graf
*/
#define LOG_CATEGORY LOGC_EFI
@@ -16,6 +18,17 @@
#include <efi_variable.h>
#include <asm/unaligned.h>
+/* TODO: temporarily added here; clean up later */
+#include <bootm.h>
+#include <efi_selftest.h>
+#include <env.h>
+#include <mapmem.h>
+#include <asm/global_data.h>
+#include <linux/libfdt.h>
+#include <linux/libfdt_env.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
static const struct efi_boot_services *bs;
static const struct efi_runtime_services *rs;
@@ -729,3 +742,507 @@ out:
return EFI_SUCCESS;
return ret;
}
+
+static struct efi_device_path *bootefi_image_path;
+static struct efi_device_path *bootefi_device_path;
+static void *image_addr;
+static size_t image_size;
+
+/**
+ * efi_get_image_parameters() - return image parameters
+ *
+ * @img_addr: address of loaded image in memory
+ * @img_size: size of loaded image
+ */
+void efi_get_image_parameters(void **img_addr, size_t *img_size)
+{
+ *img_addr = image_addr;
+ *img_size = image_size;
+}
+
+/**
+ * efi_clear_bootdev() - clear boot device
+ */
+void efi_clear_bootdev(void)
+{
+ efi_free_pool(bootefi_device_path);
+ efi_free_pool(bootefi_image_path);
+ bootefi_device_path = NULL;
+ bootefi_image_path = NULL;
+ image_addr = NULL;
+ image_size = 0;
+}
+
+/**
+ * efi_set_bootdev() - set boot device
+ *
+ * This function is called when a file is loaded, e.g. via the 'load' command.
+ * We use the path to this file to inform the UEFI binary about the boot
device.
+ *
+ * @dev: device, e.g. "MMC"
+ * @devnr: number of the device, e.g. "1:2"
+ * @path: path to file loaded
+ * @buffer: buffer with file loaded
+ * @buffer_size: size of file loaded
+ */
+void efi_set_bootdev(const char *dev, const char *devnr, const char *path,
+ void *buffer, size_t buffer_size)
+{
+ struct efi_device_path *device, *image;
+ efi_status_t ret;
+
+ log_debug("dev=%s, devnr=%s, path=%s, buffer=%p, size=%zx\n", dev,
+ devnr, path, buffer, buffer_size);
+
+ /* Forget overwritten image */
+ if (buffer + buffer_size >= image_addr &&
+ image_addr + image_size >= buffer)
+ efi_clear_bootdev();
+
+ /* Remember only PE-COFF and FIT images */
+ if (efi_check_pe(buffer, buffer_size, NULL) != EFI_SUCCESS) {
+ if (IS_ENABLED(CONFIG_FIT) &&
+ !fit_check_format(buffer, IMAGE_SIZE_INVAL)) {
+ /*
+ * FIT images of type EFI_OS are started via command
+ * bootm. We should not use their boot device with the
+ * bootefi command.
+ */
+ buffer = 0;
+ buffer_size = 0;
+ } else {
+ log_debug("- not remembering image\n");
+ return;
+ }
+ }
+
+ /* efi_set_bootdev() is typically called repeatedly, recover memory */
+ efi_clear_bootdev();
+
+ image_addr = buffer;
+ image_size = buffer_size;
+
+ ret = efi_dp_from_name(dev, devnr, path, &device, &image);
+ if (ret == EFI_SUCCESS) {
+ bootefi_device_path = device;
+ if (image) {
+ /* FIXME: image should not contain device */
+ struct efi_device_path *image_tmp = image;
+
+ efi_dp_split_file_path(image, &device, &image);
+ efi_free_pool(image_tmp);
+ }
+ bootefi_image_path = image;
+ log_debug("- boot device %pD\n", device);
+ if (image)
+ log_debug("- image %pD\n", image);
+ } else {
+ log_debug("- efi_dp_from_name() failed, err=%lx\n", ret);
+ efi_clear_bootdev();
+ }
+}
+
+/**
+ * efi_env_set_load_options() - set load options from environment variable
+ *
+ * @handle: the image handle
+ * @env_var: name of the environment variable
+ * @load_options: pointer to load options (output)
+ * Return: status code
+ */
+efi_status_t efi_env_set_load_options(efi_handle_t handle,
+ const char *env_var,
+ u16 **load_options)
+{
+ const char *env = env_get(env_var);
+ size_t size;
+ u16 *pos;
+ efi_status_t ret;
+
+ *load_options = NULL;
+ if (!env)
+ return EFI_SUCCESS;
+ size = sizeof(u16) * (utf8_utf16_strlen(env) + 1);
+ pos = calloc(size, 1);
+ if (!pos)
+ return EFI_OUT_OF_RESOURCES;
+ *load_options = pos;
+ utf8_utf16_strcpy(&pos, env);
+ ret = efi_set_load_options(handle, size, *load_options);
+ if (ret != EFI_SUCCESS) {
+ free(*load_options);
+ *load_options = NULL;
+ }
+ return ret;
+}
+
+#if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
+
+/**
+ * copy_fdt() - Copy the device tree to a new location available to EFI
+ *
+ * The FDT is copied to a suitable location within the EFI memory map.
+ * Additional 12 KiB are added to the space in case the device tree needs to be
+ * expanded later with fdt_open_into().
+ *
+ * @fdtp: On entry a pointer to the flattened device tree.
+ * On exit a pointer to the copy of the flattened device tree.
+ * FDT start
+ * Return: status code
+ */
+static efi_status_t copy_fdt(void **fdtp)
+{
+ unsigned long fdt_ram_start = -1L, fdt_pages;
+ efi_status_t ret = 0;
+ void *fdt, *new_fdt;
+ u64 new_fdt_addr;
+ uint fdt_size;
+ int i;
+
+ for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+ u64 ram_start = gd->bd->bi_dram[i].start;
+ u64 ram_size = gd->bd->bi_dram[i].size;
+
+ if (!ram_size)
+ continue;
+
+ if (ram_start < fdt_ram_start)
+ fdt_ram_start = ram_start;
+ }
+
+ /*
+ * Give us at least 12 KiB of breathing room in case the device tree
+ * needs to be expanded later.
+ */
+ fdt = *fdtp;
+ fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
+ fdt_size = fdt_pages << EFI_PAGE_SHIFT;
+
+ ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
+ EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
+ &new_fdt_addr);
+ if (ret != EFI_SUCCESS) {
+ log_err("ERROR: Failed to reserve space for FDT\n");
+ goto done;
+ }
+ new_fdt = (void *)(uintptr_t)new_fdt_addr;
+ memcpy(new_fdt, fdt, fdt_totalsize(fdt));
+ fdt_set_totalsize(new_fdt, fdt_size);
+
+ *fdtp = (void *)(uintptr_t)new_fdt_addr;
+done:
+ return ret;
+}
+
+/**
+ * get_config_table() - get configuration table
+ *
+ * @guid: GUID of the configuration table
+ * Return: pointer to configuration table or NULL
+ */
+static void *get_config_table(const efi_guid_t *guid)
+{
+ size_t i;
+
+ for (i = 0; i < systab.nr_tables; i++) {
+ if (!guidcmp(guid, &systab.tables[i].guid))
+ return systab.tables[i].table;
+ }
+ return NULL;
+}
+
+#endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
+
+/**
+ * efi_install_fdt() - install device tree
+ *
+ * If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
+ * address will be installed as configuration table, otherwise the device
+ * tree located at the address indicated by environment variable fdt_addr or as
+ * fallback fdtcontroladdr will be used.
+ *
+ * On architectures using ACPI tables device trees shall not be installed as
+ * configuration table.
+ *
+ * @fdt: address of device tree or EFI_FDT_USE_INTERNAL to use
+ * the hardware device tree as indicated by environment variable
+ * fdt_addr or as fallback the internal device tree as indicated by
+ * the environment variable fdtcontroladdr
+ * Return: status code
+ */
+efi_status_t efi_install_fdt(void *fdt)
+{
+ /*
+ * The EBBR spec requires that we have either an FDT or an ACPI table
+ * but not both.
+ */
+#if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
+ if (fdt) {
+ log_warning("WARNING: Can't have ACPI table and device tree -
ignoring DT.\n");
+ return EFI_SUCCESS;
+ }
+#else
+ struct bootm_headers img = { 0 };
+ efi_status_t ret;
+
+ if (fdt == EFI_FDT_USE_INTERNAL) {
+ const char *fdt_opt;
+ uintptr_t fdt_addr;
+
+ /* Look for device tree that is already installed */
+ if (get_config_table(&efi_guid_fdt))
+ return EFI_SUCCESS;
+ /* Check if there is a hardware device tree */
+ fdt_opt = env_get("fdt_addr");
+ /* Use our own device tree as fallback */
+ if (!fdt_opt) {
+ fdt_opt = env_get("fdtcontroladdr");
+ if (!fdt_opt) {
+ log_err("ERROR: need device tree\n");
+ return EFI_NOT_FOUND;
+ }
+ }
+ fdt_addr = hextoul(fdt_opt, NULL);
+ if (!fdt_addr) {
+ log_err("ERROR: invalid $fdt_addr or
$fdtcontroladdr\n");
+ return EFI_LOAD_ERROR;
+ }
+ fdt = map_sysmem(fdt_addr, 0);
+ }
+
+ /* Install device tree */
+ if (fdt_check_header(fdt)) {
+ log_err("ERROR: invalid device tree\n");
+ return EFI_LOAD_ERROR;
+ }
+
+ /* Prepare device tree for payload */
+ ret = copy_fdt(&fdt);
+ if (ret) {
+ log_err("ERROR: out of memory\n");
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ if (image_setup_libfdt(&img, fdt, 0, NULL)) {
+ log_err("ERROR: failed to process device tree\n");
+ return EFI_LOAD_ERROR;
+ }
+
+ /* Create memory reservations as indicated by the device tree */
+ efi_carve_out_dt_rsv(fdt);
+
+ efi_try_purge_kaslr_seed(fdt);
+
+ if (CONFIG_IS_ENABLED(EFI_TCG2_PROTOCOL_MEASURE_DTB)) {
+ ret = efi_tcg2_measure_dtb(fdt);
+ if (ret == EFI_SECURITY_VIOLATION) {
+ log_err("ERROR: failed to measure DTB\n");
+ return ret;
+ }
+ }
+
+ /* Install device tree as UEFI table */
+ ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
+ if (ret != EFI_SUCCESS) {
+ log_err("ERROR: failed to install device tree\n");
+ return ret;
+ }
+#endif /* GENERATE_ACPI_TABLE */
+
+ return EFI_SUCCESS;
+}
+
+/**
+ * do_bootefi_exec() - execute EFI binary
+ *
+ * The image indicated by @handle is started. When it returns the allocated
+ * memory for the @load_options is freed.
+ *
+ * @handle: handle of loaded image
+ * @load_options: load options
+ * Return: status code
+ *
+ * Load the EFI binary into a newly assigned memory unwinding the relocation
+ * information, install the loaded image protocol, and call the binary.
+ */
+static efi_status_t do_bootefi_exec(efi_handle_t handle, void *load_options)
+{
+ efi_status_t ret;
+ efi_uintn_t exit_data_size = 0;
+ u16 *exit_data = NULL;
+
+ /* On ARM switch from EL3 or secure mode to EL2 or non-secure mode */
+ switch_to_non_secure_mode();
+
+ /*
+ * The UEFI standard requires that the watchdog timer is set to five
+ * minutes when invoking an EFI boot option.
+ *
+ * Unified Extensible Firmware Interface (UEFI), version 2.7 Errata A
+ * 7.5. Miscellaneous Boot Services - EFI_BOOT_SERVICES.SetWatchdogTimer
+ */
+ ret = efi_set_watchdog(300);
+ if (ret != EFI_SUCCESS) {
+ log_err("ERROR: Failed to set watchdog timer\n");
+ goto out;
+ }
+
+ /* Call our payload! */
+ ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
+ if (ret != EFI_SUCCESS) {
+ log_err("## Application failed, r = %lu\n",
+ ret & ~EFI_ERROR_MASK);
+ if (exit_data) {
+ log_err("## %ls\n", exit_data);
+ efi_free_pool(exit_data);
+ }
+ }
+
+ efi_restore_gd();
+
+out:
+ free(load_options);
+
+ if (IS_ENABLED(CONFIG_EFI_LOAD_FILE2_INITRD)) {
+ if (efi_initrd_deregister() != EFI_SUCCESS)
+ log_err("Failed to remove loadfile2 for initrd\n");
+ }
+
+ /* Control is returned to U-Boot, disable EFI watchdog */
+ efi_set_watchdog(0);
+
+ return ret;
+}
+
+/**
+ * efi_bootmgr_run() - execute EFI boot manager
+ * fdt: Flat device tree
+ *
+ * Invoke EFI boot manager and execute a binary depending on
+ * boot options. If @fdt is not NULL, it will be passed to
+ * the executed binary.
+ *
+ * Return: status code
+ */
+efi_status_t efi_bootmgr_run(void *fdt)
+{
+ efi_handle_t handle;
+ void *load_options;
+ efi_status_t ret;
+
+ /* Initialize EFI drivers */
+ ret = efi_init_obj_list();
+ if (ret != EFI_SUCCESS) {
+ log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
+ ret & ~EFI_ERROR_MASK);
+ return CMD_RET_FAILURE;
+ }
+
+ ret = efi_install_fdt(fdt);
+ if (ret != EFI_SUCCESS)
+ return ret;
+
+ ret = efi_bootmgr_load(&handle, &load_options);
+ if (ret != EFI_SUCCESS) {
+ log_notice("EFI boot manager: Cannot load any image\n");
+ return ret;
+ }
+
+ return do_bootefi_exec(handle, load_options);
+}
+
+/**
+ * efi_run_image() - run loaded UEFI image
+ *
+ * @source_buffer: memory address of the UEFI image
+ * @source_size: size of the UEFI image
+ * Return: status code
+ */
+efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
+{
+ efi_handle_t mem_handle = NULL, handle;
+ struct efi_device_path *file_path = NULL;
+ struct efi_device_path *msg_path;
+ efi_status_t ret, ret2;
+ u16 *load_options;
+
+ if (!bootefi_device_path || !bootefi_image_path) {
+ log_debug("Not loaded from disk\n");
+ /*
+ * Special case for efi payload not loaded from disk,
+ * such as 'bootefi hello' or for example payload
+ * loaded directly into memory via JTAG, etc:
+ */
+ file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
+ (uintptr_t)source_buffer,
+ source_size);
+ /*
+ * Make sure that device for device_path exist
+ * in load_image(). Otherwise, shell and grub will fail.
+ */
+ ret = efi_install_multiple_protocol_interfaces(&mem_handle,
+
&efi_guid_device_path,
+ file_path, NULL);
+ if (ret != EFI_SUCCESS)
+ goto out;
+ msg_path = file_path;
+ } else {
+ file_path = efi_dp_append(bootefi_device_path,
+ bootefi_image_path);
+ msg_path = bootefi_image_path;
+ log_debug("Loaded from disk\n");
+ }
+
+ log_info("Booting %pD\n", msg_path);
+
+ ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
+ source_size, &handle));
+ if (ret != EFI_SUCCESS) {
+ log_err("Loading image failed\n");
+ goto out;
+ }
+
+ /* Transfer environment variable as load options */
+ ret = efi_env_set_load_options(handle, "bootargs", &load_options);
+ if (ret != EFI_SUCCESS)
+ goto out;
+
+ ret = do_bootefi_exec(handle, load_options);
+
+out:
+ ret2 = efi_uninstall_multiple_protocol_interfaces(mem_handle,
+ &efi_guid_device_path,
+ file_path, NULL);
+ efi_free_pool(file_path);
+ return (ret != EFI_SUCCESS) ? ret : ret2;
+}
+
+/**
+ * efi_binary_run() - run loaded UEFI image
+ *
+ * @image: memory address of the UEFI image
+ * @size: size of the UEFI image
+ *
+ * Execute an EFI binary image loaded at @image.
+ * @size may be zero if the binary is loaded with U-Boot load command.
+ *
+ * Return: status code
+ */
+efi_status_t efi_binary_run(void *image, size_t size, void *fdt)
+{
+ efi_status_t ret;
+
+ /* Initialize EFI drivers */
+ ret = efi_init_obj_list();
+ if (ret != EFI_SUCCESS) {
+ log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
+ ret & ~EFI_ERROR_MASK);
+ return -1;
+ }
+
+ ret = efi_install_fdt(fdt);
+ if (ret != EFI_SUCCESS)
+ return ret;
+
+ return efi_run_image(image, size);
+}
--
2.34.1
