[PATCH 2/2] efi_loader: support boot from URI device path
Masahisa Kojima
masahisa.kojima at linaro.org
Wed Aug 23 10:37:20 CEST 2023
This supports to boot from the URI device path.
When user selects the URI device path, bootmgr downloads
the file using wget into the address specified by loadaddr
env variable.
If the file is .iso or .img file, mount the image with blkmap
then try to boot with the default file(e.g. EFI/BOOT/BOOTAA64.EFI).
If the file is .efi file, load and start the downloaded file.
Signed-off-by: Masahisa Kojima <masahisa.kojima at linaro.org>
---
lib/efi_loader/efi_bootmgr.c | 213 +++++++++++++++++++++++++++++++++++
1 file changed, 213 insertions(+)
diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
index a40762c74c..8b20f486f2 100644
--- a/lib/efi_loader/efi_bootmgr.c
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -7,10 +7,14 @@
#define LOG_CATEGORY LOGC_EFI
+#include <blk.h>
+#include <blkmap.h>
#include <common.h>
#include <charset.h>
+#include <dm.h>
#include <log.h>
#include <malloc.h>
+#include <net.h>
#include <efi_default_filename.h>
#include <efi_loader.h>
#include <efi_variable.h>
@@ -168,6 +172,209 @@ out:
return ret;
}
+#if (IS_ENABLED(CONFIG_BLKMAP) && IS_ENABLED(CONFIG_CMD_WGET) && IS_ENABLED(CONFIG_CMD_DNS))
+/**
+ * mount_image() - mount the image
+ *
+ * @lo_label label of load option
+ * @file_size file size
+ * @handle: pointer to handle for newly installed image
+ * Return: status code
+ */
+static efi_status_t mount_image(u16 *lo_label, int file_size,
+ efi_handle_t *handle)
+{
+ int err;
+ efi_status_t ret;
+ char *label = NULL, *p;
+ lbaint_t blknum;
+ struct udevice *bm_dev;
+ efi_handle_t bm_handle;
+ struct udevice *blk, *partition;
+ struct efi_handler *handler;
+ struct efi_device_path *file_path;
+ struct efi_device_path *device_path;
+
+ label = efi_alloc(utf16_utf8_strlen(lo_label) + 1);
+ if (!label)
+ return EFI_OUT_OF_RESOURCES;
+
+ p = label;
+ utf16_utf8_strcpy(&p, lo_label);
+ err = blkmap_create(label, NULL);
+ if (err) {
+ log_err("failed to create blkmap\n");
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+ bm_dev = blkmap_from_label(label);
+ if (!bm_dev) {
+ log_err("\"%s\" is not the name of any known blkmap\n", label);
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ blknum = file_size / 512; /* TODO: don't use literal value. */
+ err = blkmap_map_pmem(bm_dev, 0, blknum, image_load_addr);
+ if (err) {
+ log_err("Unable to map %#llx at block %d : %d\n",
+ (unsigned long long)image_load_addr, 0, err);
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+ log_info("Block %d+0x" LBAF " mapped to %#llx\n", 0, blknum,
+ (unsigned long long)image_load_addr);
+
+ /* TODO: without calling this, partition devices are not binded. */
+ blk_list_part(UCLASS_BLKMAP);
+
+ /*
+ * Search the partition having EFI_SIMPLE_FILE_SYSTEM_PROTOCOL,
+ * then try to load with the default boot file(e.g. EFI/BOOT/BOOTAA64.EFI).
+ */
+ device_foreach_child(blk, bm_dev)
+ {
+ device_foreach_child(partition, blk)
+ {
+ if (dev_tag_get_ptr(partition, DM_TAG_EFI,
+ (void **)&bm_handle)) {
+ log_warning("DM_TAG_EFI not found\n");
+ continue;
+ }
+
+ ret = efi_search_protocol(
+ bm_handle,
+ &efi_simple_file_system_protocol_guid,
+ &handler);
+ if (ret != EFI_SUCCESS)
+ continue;
+
+ ret = efi_search_protocol(
+ bm_handle, &efi_guid_device_path, &handler);
+ if (ret != EFI_SUCCESS)
+ continue;
+
+ ret = efi_protocol_open(handler, (void **)&device_path,
+ efi_root, NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if (ret != EFI_SUCCESS)
+ continue;
+
+ file_path = expand_media_path(device_path);
+ ret = EFI_CALL(efi_load_image(true, efi_root, file_path,
+ NULL, 0, handle));
+ efi_free_pool(file_path);
+ if (ret == EFI_SUCCESS)
+ goto out;
+ }
+ }
+
+out:
+ efi_free_pool(label);
+
+ return ret;
+}
+
+/**
+ * try_load_from_uri_path() - Handle the URI device path
+ *
+ * @uridp: uri device path
+ * @lo_label label of load option
+ * @handle: pointer to handle for newly installed image
+ * Return: status code
+ */
+static efi_status_t try_load_from_uri_path(struct efi_device_path_uri *uridp,
+ u16 *lo_label,
+ efi_handle_t *handle)
+{
+ efi_status_t ret;
+ int file_size, file_name_len;
+ char *s, *host_name, *file_name, *str_copy;
+
+ /*
+ * Download file using wget.
+ *
+ * URI device path content is like http://www.example.com/sample/test.iso.
+ * U-Boot wget takes the target uri in this format.
+ * "<http server ip>:<file path>" e.g.) 192.168.1.1:/sample/test.iso
+ * Need to resolve the http server ip address before starting wget.
+ */
+
+ /* only support "http://" */
+ if (strncmp(uridp->uri, "http://", 7)) {
+ log_err("Error: uri must start with http://\n");
+ return EFI_INVALID_PARAMETER;
+ }
+
+ str_copy = strdup(uridp->uri);
+ if (!str_copy)
+ return EFI_OUT_OF_RESOURCES;
+ s = str_copy + strlen("http://");
+ host_name = strsep(&s, "/");
+ if (!s) {
+ log_err("Error: invalied uri, no file path\n");
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+ file_name = s;
+ net_dns_resolve = host_name;
+ net_dns_env_var = "httpserverip";
+ if (net_loop(DNS) < 0) {
+ log_err("Error: dns lookup of %s failed, check setup\n", net_dns_resolve);
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+ s = env_get("httpserverip");
+ if (!s) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ /*
+ * WGET requires that "net_boot_file_name" and "image_load_addr" global
+ * variables are properly set in advance.
+ */
+ strlcpy(net_boot_file_name, s, 1024);
+ strlcat(net_boot_file_name, ":/", 1024); /* append '/' which is removed by strsep() */
+ strlcat(net_boot_file_name, file_name, 1024);
+ s = env_get("loadaddr");
+ if (!s) {
+ log_err("Error: loadaddr is not set\n");
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+ image_load_addr = hextoul(s, NULL);
+
+ file_size = net_loop(WGET);
+ if (file_size < 0) {
+ log_err("Error: downloading file failed\n");
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ /*
+ * Identify file type by file extension.
+ * If the file extension is ".iso" or ".img", mount it and boot with default file.
+ * If the file is ".efi", load and start the downloaded file.
+ */
+ file_name_len = strlen(net_boot_file_name);
+ if (!strncmp(&net_boot_file_name[file_name_len - 4], ".iso", 4) ||
+ !strncmp(&net_boot_file_name[file_name_len - 4], ".img", 4)) {
+ ret = mount_image(lo_label, file_size, handle);
+ } else if (!strncmp(&net_boot_file_name[file_name_len - 4], ".efi", 4)) {
+ ret = efi_run_image((void *)image_load_addr, file_size);
+ } else {
+ log_err("Error: file type is not supported\n");
+ ret = EFI_INVALID_PARAMETER;
+ }
+
+out:
+ free(str_copy);
+
+ return ret;
+}
+#endif
+
/**
* try_load_entry() - try to load image for boot option
*
@@ -211,6 +418,12 @@ static efi_status_t try_load_entry(u16 n, efi_handle_t *handle,
if (EFI_DP_TYPE(lo.file_path, MEDIA_DEVICE, FILE_PATH)) {
/* file_path doesn't contain a device path */
ret = try_load_from_short_path(lo.file_path, handle);
+#if (IS_ENABLED(CONFIG_BLKMAP) && IS_ENABLED(CONFIG_CMD_WGET) && IS_ENABLED(CONFIG_CMD_DNS))
+ } else if (EFI_DP_TYPE(lo.file_path, MESSAGING_DEVICE, MSG_URI)) {
+ ret = try_load_from_uri_path(
+ (struct efi_device_path_uri *)lo.file_path,
+ lo.label, handle);
+#endif
} else {
file_path = expand_media_path(lo.file_path);
ret = EFI_CALL(efi_load_image(true, efi_root, file_path,
--
2.34.1
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