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-rw-r--r--cmd/bootefi.c49
-rw-r--r--include/config_distro_bootcmd.h5
-rw-r--r--include/efi_api.h4
-rw-r--r--include/efi_loader.h6
-rw-r--r--lib/efi_loader/Makefile2
-rw-r--r--lib/efi_loader/efi_bootmgr.c180
-rw-r--r--lib/efi_loader/efi_boottime.c6
-rw-r--r--lib/efi_loader/efi_image_loader.c1
8 files changed, 247 insertions, 6 deletions
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 9f844737e5..1e2dbcc4a4 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -219,6 +219,37 @@ exit:
return ret;
}
+static int do_bootefi_bootmgr_exec(unsigned long fdt_addr)
+{
+ struct efi_device_path *device_path, *file_path;
+ void *addr;
+ efi_status_t r;
+
+ /* Initialize and populate EFI object list */
+ if (!efi_obj_list_initalized)
+ efi_init_obj_list();
+
+ /*
+ * gd lives in a fixed register which may get clobbered while we execute
+ * the payload. So save it here and restore it on every callback entry
+ */
+ efi_save_gd();
+
+ addr = efi_bootmgr_load(&device_path, &file_path);
+ if (!addr)
+ return 1;
+
+ printf("## Starting EFI application at %p ...\n", addr);
+ r = do_bootefi_exec(addr, (void *)fdt_addr, device_path, file_path);
+ printf("## Application terminated, r = %lu\n",
+ r & ~EFI_ERROR_MASK);
+
+ if (r != EFI_SUCCESS)
+ return 1;
+
+ return 0;
+}
+
/* Interpreter command to boot an arbitrary EFI image from memory */
static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
@@ -256,7 +287,14 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return efi_selftest(&loaded_image_info, &systab);
} else
#endif
- {
+ if (!strcmp(argv[1], "bootmgr")) {
+ unsigned long fdt_addr = 0;
+
+ if (argc > 2)
+ fdt_addr = simple_strtoul(argv[2], NULL, 16);
+
+ return do_bootefi_bootmgr_exec(fdt_addr);
+ } else {
saddr = argv[1];
addr = simple_strtoul(saddr, NULL, 16);
@@ -293,7 +331,11 @@ static char bootefi_help_text[] =
"bootefi selftest\n"
" - boot an EFI selftest application stored within U-Boot\n"
#endif
- ;
+ "bootmgr [fdt addr]\n"
+ " - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
+ "\n"
+ " If specified, the device tree located at <fdt address> gets\n"
+ " exposed as EFI configuration table.\n";
#endif
U_BOOT_CMD(
@@ -331,6 +373,9 @@ void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
#endif
}
+ if (!path)
+ return;
+
if (strcmp(dev, "Net")) {
/* Add leading / to fs paths, because they're absolute */
snprintf(filename, sizeof(filename), "/%s", path);
diff --git a/include/config_distro_bootcmd.h b/include/config_distro_bootcmd.h
index 9ed6b9892c..e0d0034ed3 100644
--- a/include/config_distro_bootcmd.h
+++ b/include/config_distro_bootcmd.h
@@ -112,6 +112,11 @@
#define BOOTENV_SHARED_EFI \
"boot_efi_binary=" \
+ "if fdt addr ${fdt_addr_r}; then " \
+ "bootefi bootmgr ${fdt_addr_r};" \
+ "else " \
+ "bootefi bootmgr ${fdtcontroladdr};" \
+ "fi;" \
"load ${devtype} ${devnum}:${distro_bootpart} " \
"${kernel_addr_r} efi/boot/"BOOTEFI_NAME"; " \
"if fdt addr ${fdt_addr_r}; then " \
diff --git a/include/efi_api.h b/include/efi_api.h
index 1aae96355f..d0aefa8221 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -211,6 +211,10 @@ struct efi_runtime_services {
EFI_GUID(0x00000000, 0x0000, 0x0000, 0x00, 0x00, \
0x00, 0x00, 0x00, 0x00, 0x00, 0x00)
+#define EFI_GLOBAL_VARIABLE_GUID \
+ EFI_GUID(0x8be4df61, 0x93ca, 0x11d2, 0xaa, 0x0d, \
+ 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c)
+
#define LOADED_IMAGE_PROTOCOL_GUID \
EFI_GUID(0x5b1b31a1, 0x9562, 0x11d2, 0x8e, 0x3f, \
0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b)
diff --git a/include/efi_loader.h b/include/efi_loader.h
index d8ea870eb7..2f081f8996 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -82,6 +82,7 @@ extern const struct efi_device_path_to_text_protocol efi_device_path_to_text;
uint16_t *efi_dp_str(struct efi_device_path *dp);
+extern const efi_guid_t efi_global_variable_guid;
extern const efi_guid_t efi_guid_console_control;
extern const efi_guid_t efi_guid_device_path;
extern const efi_guid_t efi_guid_loaded_image;
@@ -232,6 +233,8 @@ efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table
void efi_setup_loaded_image(struct efi_loaded_image *info, struct efi_object *obj,
struct efi_device_path *device_path,
struct efi_device_path *file_path);
+efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
+ void **buffer);
#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
extern void *efi_bounce_buffer;
@@ -319,6 +322,9 @@ efi_status_t EFIAPI efi_set_variable(s16 *variable_name,
efi_guid_t *vendor, u32 attributes,
unsigned long data_size, void *data);
+void *efi_bootmgr_load(struct efi_device_path **device_path,
+ struct efi_device_path **file_path);
+
#else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
/* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 301bf7b507..ddb978f650 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -17,7 +17,7 @@ endif
obj-$(CONFIG_CMD_BOOTEFI_HELLO) += helloworld_efi.o
obj-y += efi_image_loader.o efi_boottime.o efi_runtime.o efi_console.o
obj-y += efi_memory.o efi_device_path_to_text.o efi_device_path.o
-obj-y += efi_file.o efi_variable.o
+obj-y += efi_file.o efi_variable.o efi_bootmgr.o
obj-$(CONFIG_LCD) += efi_gop.o
obj-$(CONFIG_DM_VIDEO) += efi_gop.o
obj-$(CONFIG_PARTITIONS) += efi_disk.o
diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
new file mode 100644
index 0000000000..857d88a879
--- /dev/null
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -0,0 +1,180 @@
+/*
+ * EFI utils
+ *
+ * Copyright (c) 2017 Rob Clark
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <charset.h>
+#include <malloc.h>
+#include <efi_loader.h>
+
+static const struct efi_boot_services *bs;
+static const struct efi_runtime_services *rs;
+
+#define LOAD_OPTION_ACTIVE 0x00000001
+#define LOAD_OPTION_FORCE_RECONNECT 0x00000002
+#define LOAD_OPTION_HIDDEN 0x00000008
+
+/*
+ * bootmgr implements the logic of trying to find a payload to boot
+ * based on the BootOrder + BootXXXX variables, and then loading it.
+ *
+ * TODO detecting a special key held (f9?) and displaying a boot menu
+ * like you would get on a PC would be clever.
+ *
+ * TODO if we had a way to write and persist variables after the OS
+ * has started, we'd also want to check OsIndications to see if we
+ * should do normal or recovery boot.
+ */
+
+
+/*
+ * See section 3.1.3 in the v2.7 UEFI spec for more details on
+ * the layout of EFI_LOAD_OPTION. In short it is:
+ *
+ * typedef struct _EFI_LOAD_OPTION {
+ * UINT32 Attributes;
+ * UINT16 FilePathListLength;
+ * // CHAR16 Description[]; <-- variable length, NULL terminated
+ * // EFI_DEVICE_PATH_PROTOCOL FilePathList[]; <-- FilePathListLength bytes
+ * // UINT8 OptionalData[];
+ * } EFI_LOAD_OPTION;
+ */
+struct load_option {
+ u32 attributes;
+ u16 file_path_length;
+ u16 *label;
+ struct efi_device_path *file_path;
+ u8 *optional_data;
+};
+
+/* parse an EFI_LOAD_OPTION, as described above */
+static void parse_load_option(struct load_option *lo, void *ptr)
+{
+ lo->attributes = *(u32 *)ptr;
+ ptr += sizeof(u32);
+
+ lo->file_path_length = *(u16 *)ptr;
+ ptr += sizeof(u16);
+
+ lo->label = ptr;
+ ptr += (utf16_strlen(lo->label) + 1) * 2;
+
+ lo->file_path = ptr;
+ ptr += lo->file_path_length;
+
+ lo->optional_data = ptr;
+}
+
+/* free() the result */
+static void *get_var(u16 *name, const efi_guid_t *vendor,
+ unsigned long *size)
+{
+ efi_guid_t *v = (efi_guid_t *)vendor;
+ efi_status_t ret;
+ void *buf = NULL;
+
+ *size = 0;
+ EFI_CALL(ret = rs->get_variable((s16 *)name, v, NULL, size, buf));
+ if (ret == EFI_BUFFER_TOO_SMALL) {
+ buf = malloc(*size);
+ EFI_CALL(ret = rs->get_variable((s16 *)name, v, NULL, size, buf));
+ }
+
+ if (ret != EFI_SUCCESS) {
+ free(buf);
+ *size = 0;
+ return NULL;
+ }
+
+ return buf;
+}
+
+/*
+ * Attempt to load load-option number 'n', returning device_path and file_path
+ * if successful. This checks that the EFI_LOAD_OPTION is active (enabled)
+ * and that the specified file to boot exists.
+ */
+static void *try_load_entry(uint16_t n, struct efi_device_path **device_path,
+ struct efi_device_path **file_path)
+{
+ struct load_option lo;
+ u16 varname[] = L"Boot0000";
+ u16 hexmap[] = L"0123456789ABCDEF";
+ void *load_option, *image = NULL;
+ unsigned long size;
+
+ varname[4] = hexmap[(n & 0xf000) >> 12];
+ varname[5] = hexmap[(n & 0x0f00) >> 8];
+ varname[6] = hexmap[(n & 0x00f0) >> 4];
+ varname[7] = hexmap[(n & 0x000f) >> 0];
+
+ load_option = get_var(varname, &efi_global_variable_guid, &size);
+ if (!load_option)
+ return NULL;
+
+ parse_load_option(&lo, load_option);
+
+ if (lo.attributes & LOAD_OPTION_ACTIVE) {
+ efi_status_t ret;
+ u16 *str = NULL;
+
+ debug("%s: trying to load \"%ls\" from: %ls\n", __func__,
+ lo.label, (str = efi_dp_str(lo.file_path)));
+ efi_free_pool(str);
+
+ ret = efi_load_image_from_path(lo.file_path, &image);
+
+ if (ret != EFI_SUCCESS)
+ goto error;
+
+ printf("Booting: %ls\n", lo.label);
+ efi_dp_split_file_path(lo.file_path, device_path, file_path);
+ }
+
+error:
+ free(load_option);
+
+ return image;
+}
+
+/*
+ * Attempt to load, in the order specified by BootOrder EFI variable, the
+ * available load-options, finding and returning the first one that can
+ * be loaded successfully.
+ */
+void *efi_bootmgr_load(struct efi_device_path **device_path,
+ struct efi_device_path **file_path)
+{
+ uint16_t *bootorder;
+ unsigned long size;
+ void *image = NULL;
+ int i, num;
+
+ __efi_entry_check();
+
+ bs = systab.boottime;
+ rs = systab.runtime;
+
+ bootorder = get_var(L"BootOrder", &efi_global_variable_guid, &size);
+ if (!bootorder)
+ goto error;
+
+ num = size / sizeof(uint16_t);
+ for (i = 0; i < num; i++) {
+ debug("%s: trying to load Boot%04X\n", __func__, bootorder[i]);
+ image = try_load_entry(bootorder[i], device_path, file_path);
+ if (image)
+ break;
+ }
+
+ free(bootorder);
+
+error:
+ __efi_exit_check();
+
+ return image;
+}
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 90f0051484..f97b0ca4ab 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -814,8 +814,8 @@ void efi_setup_loaded_image(struct efi_loaded_image *info, struct efi_object *ob
list_add_tail(&obj->link, &efi_obj_list);
}
-static efi_status_t load_image_from_path(struct efi_device_path *file_path,
- void **buffer)
+efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
+ void **buffer)
{
struct efi_file_info *info = NULL;
struct efi_file_handle *f;
@@ -875,7 +875,7 @@ static efi_status_t EFIAPI efi_load_image(bool boot_policy,
struct efi_device_path *dp, *fp;
efi_status_t ret;
- ret = load_image_from_path(file_path, &source_buffer);
+ ret = efi_load_image_from_path(file_path, &source_buffer);
if (ret != EFI_SUCCESS) {
free(info);
free(obj);
diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c
index 469acae082..242e6a504b 100644
--- a/lib/efi_loader/efi_image_loader.c
+++ b/lib/efi_loader/efi_image_loader.c
@@ -15,6 +15,7 @@
DECLARE_GLOBAL_DATA_PTR;
+const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID;
const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID;
const efi_guid_t efi_simple_file_system_protocol_guid =
generated by cgit (git 2.34.1) at 2025-01-11 09:38:09 +0000