[U-Boot] [PATCH 8/9] efi_loader: rework bootmgr/bootefi using load_image API
AKASHI Takahiro
takahiro.akashi at linaro.org
Fri Apr 19 03:22:35 UTC 2019
In the current implementation, bootefi command and EFI boot manager
don't use load_image API, instead, use more primitive and internal
functions. This will introduce duplicated code and potentially
unknown bugs as well as inconsistent behaviours.
With this patch, do_efibootmgr() and do_boot_efi() are completely
overhauled and re-implemented using load_image API.
Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
cmd/bootefi.c | 187 ++++++++++++++++++----------------
include/efi_loader.h | 5 +-
lib/efi_loader/efi_bootmgr.c | 43 ++++----
lib/efi_loader/efi_boottime.c | 2 +
4 files changed, 127 insertions(+), 110 deletions(-)
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index e2ca68c4dc12..8c84fff590a7 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -242,89 +242,36 @@ static efi_status_t efi_install_fdt(const char *fdt_opt)
/**
* do_bootefi_exec() - execute EFI binary
*
- * @efi: address of the binary
- * @device_path: path of the device from which the binary was loaded
- * @image_path: device path of the binary
+ * @handle: handle of loaded image
* 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(void *efi,
- struct efi_device_path *device_path,
- struct efi_device_path *image_path)
+static efi_status_t do_bootefi_exec(efi_handle_t handle)
{
- efi_handle_t mem_handle = NULL;
- struct efi_device_path *memdp = NULL;
efi_status_t ret;
- struct efi_loaded_image_obj *image_obj = NULL;
- struct efi_loaded_image *loaded_image_info = NULL;
-
- /*
- * Special case for efi payload not loaded from disk, such as
- * 'bootefi hello' or for example payload loaded directly into
- * memory via JTAG, etc:
- */
- if (!device_path && !image_path) {
- printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
- /* actual addresses filled in after efi_load_pe() */
- memdp = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
- device_path = image_path = memdp;
- /*
- * Grub expects that the device path of the loaded image is
- * installed on a handle.
- */
- ret = efi_create_handle(&mem_handle);
- if (ret != EFI_SUCCESS)
- return ret; /* TODO: leaks device_path */
- ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
- device_path);
- if (ret != EFI_SUCCESS)
- goto err_add_protocol;
- } else {
- assert(device_path && image_path);
- }
-
- ret = efi_setup_loaded_image(device_path, image_path, &image_obj,
- &loaded_image_info);
- if (ret)
- goto err_prepare;
/* Transfer environment variable as load options */
- ret = set_load_options((efi_handle_t)image_obj, "bootargs");
- if (ret != EFI_SUCCESS)
- goto err_prepare;
-
- /* Load the EFI payload */
- ret = efi_load_pe(image_obj, efi, loaded_image_info);
+ ret = set_load_options(handle, "bootargs");
if (ret != EFI_SUCCESS)
- goto err_prepare;
-
- if (memdp) {
- struct efi_device_path_memory *mdp = (void *)memdp;
- mdp->memory_type = loaded_image_info->image_code_type;
- mdp->start_address = (uintptr_t)loaded_image_info->image_base;
- mdp->end_address = mdp->start_address +
- loaded_image_info->image_size;
- }
+ return ret;
/* we don't support much: */
env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
"{ro,boot}(blob)0000000000000000");
/* Call our payload! */
- debug("%s: Jumping to 0x%p\n", __func__, image_obj->entry);
- ret = EFI_CALL(efi_start_image(&image_obj->header, NULL, NULL));
+ ret = EFI_CALL(efi_start_image(handle, NULL, NULL));
-err_prepare:
- /* image has returned, loaded-image obj goes *poof*: */
efi_restore_gd();
- free(loaded_image_info->load_options);
- efi_delete_handle(&image_obj->header);
-err_add_protocol:
- if (mem_handle)
- efi_delete_handle(mem_handle);
+ /*
+ * FIXME: Who is responsible for
+ * free(loaded_image_info->load_options);
+ * Once efi_exit() is implemented correctly,
+ * handle itself doesn't exist here.
+ */
return ret;
}
@@ -339,8 +286,7 @@ err_add_protocol:
*/
static int do_efibootmgr(const char *fdt_opt)
{
- struct efi_device_path *device_path, *file_path;
- void *addr;
+ efi_handle_t handle;
efi_status_t ret;
/* Allow unaligned memory access */
@@ -362,19 +308,19 @@ static int do_efibootmgr(const char *fdt_opt)
else if (ret != EFI_SUCCESS)
return CMD_RET_FAILURE;
- addr = efi_bootmgr_load(&device_path, &file_path);
- if (!addr)
- return 1;
+ ret = efi_bootmgr_load(&handle);
+ if (ret != EFI_SUCCESS) {
+ printf("EFI boot manager: Cannot load any image\n");
+ return CMD_RET_FAILURE;
+ }
- printf("## Starting EFI application at %p ...\n", addr);
- ret = do_bootefi_exec(addr, device_path, file_path);
- printf("## Application terminated, r = %lu\n",
- ret & ~EFI_ERROR_MASK);
+ ret = do_bootefi_exec(handle);
+ printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
if (ret != EFI_SUCCESS)
- return 1;
+ return CMD_RET_FAILURE;
- return 0;
+ return CMD_RET_SUCCESS;
}
/*
@@ -389,7 +335,12 @@ static int do_efibootmgr(const char *fdt_opt)
*/
static int do_bootefi_image(const char *image_opt, const char *fdt_opt)
{
- unsigned long addr;
+ void *image_buf;
+ struct efi_device_path *device_path, *image_path;
+ struct efi_device_path *memdp = NULL, *file_path = NULL;
+ unsigned long addr, size;
+ const char *size_str;
+ efi_handle_t mem_handle = NULL, handle;
efi_status_t ret;
/* Allow unaligned memory access */
@@ -414,33 +365,90 @@ static int do_bootefi_image(const char *image_opt, const char *fdt_opt)
#ifdef CONFIG_CMD_BOOTEFI_HELLO
if (!strcmp(image_opt, "hello")) {
char *saddr;
- ulong size = __efi_helloworld_end - __efi_helloworld_begin;
saddr = env_get("loadaddr");
+ size = __efi_helloworld_end - __efi_helloworld_begin;
+
if (saddr)
addr = simple_strtoul(saddr, NULL, 16);
else
addr = CONFIG_SYS_LOAD_ADDR;
- memcpy(map_sysmem(addr, size), __efi_helloworld_begin, size);
+
+ image_buf = map_sysmem(addr, size);
+ memcpy(image_buf, __efi_helloworld_begin, size);
+
+ device_path = NULL;
+ image_path = NULL;
} else
#endif
{
+ size_str = env_get("filesize");
+ if (size_str)
+ size = simple_strtoul(size_str, NULL, 16);
+ else
+ size = 0;
+
addr = simple_strtoul(image_opt, NULL, 16);
/* Check that a numeric value was passed */
if (!addr && *image_opt != '0')
return CMD_RET_USAGE;
+
+ image_buf = map_sysmem(addr, size);
+
+ device_path = bootefi_device_path;
+ image_path = bootefi_image_path;
}
- printf("## Starting EFI application at %08lx ...\n", addr);
- ret = do_bootefi_exec(map_sysmem(addr, 0), bootefi_device_path,
- bootefi_image_path);
- printf("## Application terminated, r = %lu\n",
- ret & ~EFI_ERROR_MASK);
+ if (!device_path && !image_path) {
+ /*
+ * Special case for efi payload not loaded from disk,
+ * such as 'bootefi hello' or for example payload
+ * loaded directly into memory via JTAG, etc:
+ */
+ memdp = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
+ (uintptr_t)image_buf, size);
+ file_path = memdp; /* append(memdp, NULL) */
+
+ /*
+ * Make sure that device for device_path exist
+ * in load_image(). Otherwise, shell and grub will fail.
+ */
+ ret = efi_create_handle(&mem_handle);
+ if (ret != EFI_SUCCESS)
+ /* TODO: leaks device_path */
+ goto err_add_protocol;
+
+ ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
+ memdp);
+ if (ret != EFI_SUCCESS)
+ goto err_add_protocol;
+ } else {
+ assert(device_path && image_path);
+ file_path = efi_dp_append(device_path, image_path);
+ }
+
+ ret = EFI_CALL(efi_load_image(false, efi_root,
+ file_path, image_buf, size, &handle));
+ if (ret != EFI_SUCCESS)
+ goto err_prepare;
+
+ ret = do_bootefi_exec(handle);
+ printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
+
+err_prepare:
+ if (device_path)
+ efi_free_pool(file_path);
+
+err_add_protocol:
+ if (mem_handle)
+ efi_delete_handle(mem_handle);
+ if (file_path) /* hence memdp */
+ efi_free_pool(file_path);
if (ret != EFI_SUCCESS)
return CMD_RET_FAILURE;
- else
- return CMD_RET_SUCCESS;
+
+ return CMD_RET_SUCCESS;
}
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
@@ -598,7 +606,7 @@ static char bootefi_help_text[] =
" Use environment variable efi_selftest to select a single test.\n"
" Use 'setenv efi_selftest list' to enumerate all tests.\n"
#endif
- "bootefi bootmgr [fdt addr]\n"
+ "bootefi bootmgr [fdt address]\n"
" - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
"\n"
" If specified, the device tree located at <fdt address> gets\n"
@@ -623,6 +631,13 @@ void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
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;
} else {
bootefi_device_path = NULL;
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 93f7672aecbc..39ed8a6fa592 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -412,8 +412,6 @@ efi_status_t efi_setup_loaded_image(struct efi_device_path *device_path,
struct efi_device_path *file_path,
struct efi_loaded_image_obj **handle_ptr,
struct efi_loaded_image **info_ptr);
-efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
- void **buffer, efi_uintn_t *size);
/* Print information about all loaded images */
void efi_print_image_infos(void *pc);
@@ -567,8 +565,7 @@ struct efi_load_option {
void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data);
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
-void *efi_bootmgr_load(struct efi_device_path **device_path,
- struct efi_device_path **file_path);
+efi_status_t efi_bootmgr_load(efi_handle_t *handle);
#else /* CONFIG_IS_ENABLED(EFI_LOADER) */
diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
index 4fccadc5483d..13ec79b2098b 100644
--- a/lib/efi_loader/efi_bootmgr.c
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -120,14 +120,14 @@ static void *get_var(u16 *name, const efi_guid_t *vendor,
* 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)
+static efi_status_t try_load_entry(u16 n, efi_handle_t *handle)
{
struct efi_load_option lo;
u16 varname[] = L"Boot0000";
u16 hexmap[] = L"0123456789ABCDEF";
- void *load_option, *image = NULL;
+ void *load_option;
efi_uintn_t size;
+ efi_status_t ret;
varname[4] = hexmap[(n & 0xf000) >> 12];
varname[5] = hexmap[(n & 0x0f00) >> 8];
@@ -136,19 +136,19 @@ static void *try_load_entry(uint16_t n, struct efi_device_path **device_path,
load_option = get_var(varname, &efi_global_variable_guid, &size);
if (!load_option)
- return NULL;
+ return EFI_LOAD_ERROR;
efi_deserialize_load_option(&lo, load_option);
if (lo.attributes & LOAD_OPTION_ACTIVE) {
u32 attributes;
- efi_status_t ret;
debug("%s: trying to load \"%ls\" from %pD\n",
__func__, lo.label, lo.file_path);
- ret = efi_load_image_from_path(lo.file_path, &image, &size);
-
+ ret = EFI_CALL(efi_load_image(false, (void *)0x1 /* FIXME */,
+ lo.file_path, NULL, 0,
+ handle));
if (ret != EFI_SUCCESS)
goto error;
@@ -159,17 +159,22 @@ static void *try_load_entry(uint16_t n, struct efi_device_path **device_path,
L"BootCurrent",
(efi_guid_t *)&efi_global_variable_guid,
attributes, size, &n));
- if (ret != EFI_SUCCESS)
+ if (ret != EFI_SUCCESS) {
+ if (EFI_CALL(efi_unload_image(*handle))
+ != EFI_SUCCESS)
+ printf("Unloading image failed\n");
goto error;
+ }
printf("Booting: %ls\n", lo.label);
- efi_dp_split_file_path(lo.file_path, device_path, file_path);
+ } else {
+ ret = EFI_LOAD_ERROR;
}
error:
free(load_option);
- return image;
+ return ret;
}
/*
@@ -177,12 +182,10 @@ error:
* 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)
+efi_status_t efi_bootmgr_load(efi_handle_t *handle)
{
u16 bootnext, *bootorder;
efi_uintn_t size;
- void *image = NULL;
int i, num;
efi_status_t ret;
@@ -209,10 +212,9 @@ void *efi_bootmgr_load(struct efi_device_path **device_path,
/* load BootNext */
if (ret == EFI_SUCCESS) {
if (size == sizeof(u16)) {
- image = try_load_entry(bootnext, device_path,
- file_path);
- if (image)
- return image;
+ ret = try_load_entry(bootnext, handle);
+ if (ret == EFI_SUCCESS)
+ return ret;
}
} else {
printf("Deleting BootNext failed\n");
@@ -223,19 +225,20 @@ void *efi_bootmgr_load(struct efi_device_path **device_path,
bootorder = get_var(L"BootOrder", &efi_global_variable_guid, &size);
if (!bootorder) {
printf("BootOrder not defined\n");
+ ret = EFI_NOT_FOUND;
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)
+ ret = try_load_entry(bootorder[i], handle);
+ if (ret == EFI_SUCCESS)
break;
}
free(bootorder);
error:
- return image;
+ return ret;
}
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index abc295e392e9..19a58144cf4b 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1591,6 +1591,7 @@ failure:
* @size: size of the loaded image
* Return: status code
*/
+static
efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
void **buffer, efi_uintn_t *size)
{
@@ -2664,6 +2665,7 @@ efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
}
current_image = image_handle;
+ EFI_PRINT("Jumping into 0x%p\n", image_obj->entry);
ret = EFI_CALL(image_obj->entry(image_handle, &systab));
/*
--
2.20.1
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