[PATCH 1/4 v7] efi: Add ESRT to the EFI system table
Jose Marinho
jose.marinho at arm.com
Thu Mar 11 14:18:50 CET 2021
The ESRT is initialised during efi_init_objlist after
efi_initialize_system_table().
The ESRT is recreated from scratch at the following events:
- successful UpdateCapsule;
- FMP instance install.
The code ensures that every ESRT entry has a unique fw_class value.
Limitations:
- The ESRT is not updated if an FMP instance is uninstalled;
- the fields image_type and flags are in the current implementation left
undefined. Setting these values will require a per-platform function
that returns the image_type/flags as a function of the image fw_class.
CC: Heinrich Schuchardt <xypron.glpk at gmx.de>
CC: Sughosh Ganu <sughosh.ganu at linaro.org>
CC: AKASHI Takahiro <takahiro.akashi at linaro.org>
CC: Ilias Apalodimas <ilias.apalodimas at linaro.org>
CC: Andre Przywara <andre.przywara at arm.com>
CC: Alexander Graf <agraf at csgraf.de>
CC: nd at arm.com
Signed-off-by: Jose Marinho <jose.marinho at arm.com>
Remove two EFI_CALL() indirections.
Move ESRT GUID in efidebug's list of GUIDs.
Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
cmd/efidebug.c | 4 +
include/efi_api.h | 21 ++
include/efi_loader.h | 24 ++
lib/efi_loader/Kconfig | 7 +
lib/efi_loader/Makefile | 1 +
lib/efi_loader/efi_boottime.c | 7 +-
lib/efi_loader/efi_capsule.c | 8 +
lib/efi_loader/efi_esrt.c | 510 ++++++++++++++++++++++++++++++++++
lib/efi_loader/efi_setup.c | 6 +
9 files changed, 584 insertions(+), 4 deletions(-)
create mode 100644 lib/efi_loader/efi_esrt.c
diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index e4030f514a..b3d7bd8897 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -516,6 +516,10 @@ static const struct {
"ACPI table",
EFI_ACPI_TABLE_GUID,
},
+ {
+ "EFI System Resource Table",
+ EFI_SYSTEM_RESOURCE_TABLE_GUID,
+ },
{
"device tree",
EFI_FDT_GUID,
diff --git a/include/efi_api.h b/include/efi_api.h
index 48e48a6263..fb53637419 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -1722,6 +1722,23 @@ struct efi_load_file_protocol {
void *buffer);
};
+struct efi_system_resource_entry {
+ efi_guid_t fw_class;
+ u32 fw_type;
+ u32 fw_version;
+ u32 lowest_supported_fw_version;
+ u32 capsule_flags;
+ u32 last_attempt_version;
+ u32 last_attempt_status;
+} __packed;
+
+struct efi_system_resource_table {
+ u32 fw_resource_count;
+ u32 fw_resource_count_max;
+ u64 fw_resource_version;
+ struct efi_system_resource_entry entries[];
+} __packed;
+
/* Boot manager load options */
#define LOAD_OPTION_ACTIVE 0x00000001
#define LOAD_OPTION_FORCE_RECONNECT 0x00000002
@@ -1740,6 +1757,10 @@ struct efi_load_file_protocol {
#define ESRT_FW_TYPE_DEVICEFIRMWARE 0x00000002
#define ESRT_FW_TYPE_UEFIDRIVER 0x00000003
+#define EFI_SYSTEM_RESOURCE_TABLE_GUID\
+ EFI_GUID(0xb122a263, 0x3661, 0x4f68,\
+ 0x99, 0x29, 0x78, 0xf8, 0xb0, 0xd6, 0x21, 0x80)
+
/* Last Attempt Status Values */
#define LAST_ATTEMPT_STATUS_SUCCESS 0x00000000
#define LAST_ATTEMPT_STATUS_ERROR_UNSUCCESSFUL 0x00000001
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 68daa1a4a9..719aa90490 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -214,6 +214,8 @@ extern const efi_guid_t efi_guid_rng_protocol;
extern const efi_guid_t efi_guid_capsule_report;
/* GUID of firmware management protocol */
extern const efi_guid_t efi_guid_firmware_management_protocol;
+/* GUID for the ESRT */
+extern const efi_guid_t efi_esrt_guid;
extern unsigned int __efi_runtime_start, __efi_runtime_stop;
extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
@@ -558,6 +560,10 @@ struct efi_simple_file_system_protocol *efi_simple_file_system(
/* open file from device-path: */
struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp);
+/* Registers a callback function for a notification event. */
+efi_status_t EFIAPI efi_register_protocol_notify(const efi_guid_t *protocol,
+ struct efi_event *event,
+ void **registration);
/**
* efi_size_in_pages() - convert size in bytes to size in pages
*
@@ -890,4 +896,22 @@ static inline efi_status_t efi_launch_capsules(void)
#endif /* CONFIG_IS_ENABLED(EFI_LOADER) */
+/**
+ * Install the ESRT system table.
+ *
+ * @return status code
+ */
+efi_status_t efi_esrt_register(void);
+
+/**
+ * efi_esrt_populate() - Populates the ESRT entries from the FMP instances
+ * present in the system.
+ * If an ESRT already exists, the old ESRT is replaced in the system table.
+ * The memory of the old ESRT is deallocated.
+ *
+ * Return:
+ * - EFI_SUCCESS if the ESRT is correctly created
+ * - error code otherwise.
+ */
+efi_status_t efi_esrt_populate(void);
#endif /* _EFI_LOADER_H */
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index e729f727df..a96014ce18 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -347,4 +347,11 @@ config EFI_SECURE_BOOT
it is signed with a trusted key. To do that, you need to install,
at least, PK, KEK and db.
+config EFI_ESRT
+ bool "Enable the UEFI ESRT generation"
+ depends on EFI_CAPSULE_FIRMWARE_MANAGEMENT
+ default y
+ help
+ Enabling this option creates the ESRT UEFI system table.
+
endif
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 10b42e8847..9a8127846f 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -52,6 +52,7 @@ obj-y += efi_variable.o
obj-$(CONFIG_EFI_VARIABLES_PRESEED) += efi_var_seed.o
endif
obj-y += efi_watchdog.o
+obj-$(CONFIG_EFI_ESRT) += efi_esrt.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_boottime.c b/lib/efi_loader/efi_boottime.c
index 41b8949b04..8e8b0a9bc6 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1406,10 +1406,9 @@ out:
*
* Return: status code
*/
-static efi_status_t EFIAPI efi_register_protocol_notify(
- const efi_guid_t *protocol,
- struct efi_event *event,
- void **registration)
+efi_status_t EFIAPI efi_register_protocol_notify(const efi_guid_t *protocol,
+ struct efi_event *event,
+ void **registration)
{
struct efi_register_notify_event *item;
efi_status_t ret = EFI_SUCCESS;
diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
index b57f0302c5..547e8582bf 100644
--- a/lib/efi_loader/efi_capsule.c
+++ b/lib/efi_loader/efi_capsule.c
@@ -482,6 +482,14 @@ efi_status_t EFIAPI efi_update_capsule(
goto out;
}
out:
+
+ if (IS_ENABLED(CONFIG_EFI_ESRT)) {
+ /* Rebuild the ESRT to reflect any updated FW images. */
+ ret = efi_esrt_populate();
+ if (ret != EFI_SUCCESS)
+ log_warning("EFI Capsule: failed to update ESRT\n");
+ }
+
return EFI_EXIT(ret);
}
diff --git a/lib/efi_loader/efi_esrt.c b/lib/efi_loader/efi_esrt.c
new file mode 100644
index 0000000000..947bdb5e95
--- /dev/null
+++ b/lib/efi_loader/efi_esrt.c
@@ -0,0 +1,510 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * EFI application ESRT tables support
+ *
+ * Copyright (C) 2021 Arm Ltd.
+ */
+
+#include <common.h>
+#include <efi_loader.h>
+#include <log.h>
+#include <efi_api.h>
+#include <malloc.h>
+
+const efi_guid_t efi_esrt_guid = EFI_SYSTEM_RESOURCE_TABLE_GUID;
+
+static struct efi_system_resource_table *esrt;
+
+#define EFI_ESRT_VERSION 1
+
+/**
+ * efi_esrt_image_info_to_entry() - copy the information present in a fw image
+ * descriptor to a ESRT entry.
+ * The function ensures the ESRT entry matches the image_type_id in @img_info.
+ * In case of a mismatch we leave the entry unchanged.
+ *
+ * @img_info: the source image info descriptor
+ * @entry: pointer to the ESRT entry to be filled
+ * @desc_version: the version of the elements in img_info
+ * @image_type: the image type value to be set in the ESRT entry
+ * @flags: the capsule flags value to be set in the ESRT entry
+ *
+ * Return:
+ * - EFI_SUCCESS if the entry is correctly updated
+ * - EFI_INVALID_PARAMETER if entry does not match image_type_id in @img_info.
+ */
+static efi_status_t
+efi_esrt_image_info_to_entry(struct efi_firmware_image_descriptor *img_info,
+ struct efi_system_resource_entry *entry,
+ u32 desc_version, u32 image_type, u32 flags)
+{
+ if (guidcmp(&entry->fw_class, &img_info->image_type_id)) {
+ EFI_PRINT("ESRT entry %pUL mismatches img_type_id %pUL\n",
+ &entry->fw_class, &img_info->image_type_id);
+ return EFI_INVALID_PARAMETER;
+ }
+
+ entry->fw_version = img_info->version;
+
+ entry->fw_type = image_type;
+ entry->capsule_flags = flags;
+
+ /*
+ * The field lowest_supported_image_version is only present
+ * on image info structure of version 2 or greater.
+ * See the EFI_FIRMWARE_IMAGE_DESCRIPTOR definition in UEFI.
+ */
+ if (desc_version >= 2)
+ entry->lowest_supported_fw_version =
+ img_info->lowest_supported_image_version;
+ else
+ entry->lowest_supported_fw_version = 0;
+
+ /*
+ * The fields last_attempt_version and last_attempt_status
+ * are only present on image info structure of version 3 or
+ * greater.
+ * See the EFI_FIRMWARE_IMAGE_DESCRIPTOR definition in UEFI.
+ */
+ if (desc_version >= 3) {
+ entry->last_attempt_version =
+ img_info->last_attempt_version;
+
+ entry->last_attempt_status =
+ img_info->last_attempt_status;
+ } else {
+ entry->last_attempt_version = 0;
+ entry->last_attempt_status = LAST_ATTEMPT_STATUS_SUCCESS;
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ * efi_esrt_entries_to_size() - Obtain the bytes used by an ESRT
+ * datastructure with @num_entries.
+ *
+ * @num_entries: the number of entries in the ESRT.
+ *
+ * Return: the number of bytes an ESRT with @num_entries occupies in memory.
+ */
+static
+inline u32 efi_esrt_entries_to_size(u32 num_entries)
+{
+ u32 esrt_size = sizeof(struct efi_system_resource_table) +
+ num_entries * sizeof(struct efi_system_resource_entry);
+
+ return esrt_size;
+}
+
+/**
+ * efi_esrt_allocate_install() - Allocates @num_entries for the ESRT and
+ * performs basic ESRT initialization.
+ *
+ * @num_entries: the number of entries that the ESRT will hold.
+ *
+ * Return:
+ * - pointer to the ESRT if successful.
+ * - NULL otherwise.
+ */
+static
+efi_status_t efi_esrt_allocate_install(u32 num_entries)
+{
+ efi_status_t ret;
+ struct efi_system_resource_table *new_esrt;
+ u32 size = efi_esrt_entries_to_size(num_entries);
+ efi_guid_t esrt_guid = efi_esrt_guid;
+
+ /* Reserve num_pages for ESRT */
+ ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, size,
+ (void **)&new_esrt);
+
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT cannot allocate memory for %d entries (%d bytes)\n",
+ num_entries, efi_esrt_entries_to_size(num_entries));
+
+ return ret;
+ }
+
+ new_esrt->fw_resource_count_max = num_entries;
+ new_esrt->fw_resource_count = 0;
+ new_esrt->fw_resource_version = EFI_ESRT_VERSION;
+
+ /* Install the ESRT in the system configuration table. */
+ ret = efi_install_configuration_table(&esrt_guid, (void *)new_esrt);
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to install the ESRT in the system table\n");
+ return ret;
+ }
+
+ /* If there was a previous ESRT, deallocate its memory now. */
+ if (esrt)
+ ret = EFI_CALL(efi_free_pool(esrt));
+
+ esrt = new_esrt;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ * esrt_find_entry() - Obtain the ESRT entry for the image with GUID
+ * @img_fw_class.
+ *
+ * If the img_fw_class is not yet present in the ESRT, this function
+ * reserves the tail element of the current ESRT as the entry for that fw_class.
+ * The number of elements in the ESRT is updated in that case.
+ *
+ * @img_fw_class: the GUID of the FW image which ESRT entry we want to obtain.
+ *
+ * Return:
+ * - A pointer to the ESRT entry for the image with GUID img_fw_class,
+ * - NULL if:
+ * - there is no more space in the ESRT,
+ * - ESRT is not initialized,
+ */
+static
+struct efi_system_resource_entry *esrt_find_entry(efi_guid_t *img_fw_class)
+{
+ u32 filled_entries;
+ u32 max_entries;
+ struct efi_system_resource_entry *entry;
+
+ if (!esrt) {
+ EFI_PRINT("ESRT access before initialized\n");
+ return NULL;
+ }
+
+ filled_entries = esrt->fw_resource_count;
+ entry = esrt->entries;
+
+ /* Check if the image with img_fw_class is already in the ESRT. */
+ for (u32 idx = 0; idx < filled_entries; idx++) {
+ if (!guidcmp(&entry[idx].fw_class, img_fw_class)) {
+ EFI_PRINT("ESRT found entry for image %pUl at index %d\n",
+ img_fw_class, idx);
+ return &entry[idx];
+ }
+ }
+
+ max_entries = esrt->fw_resource_count_max;
+ /*
+ * Since the image with img_fw_class is not present in the ESRT, check
+ * if ESRT is full before appending the new entry to it.
+ */
+ if (filled_entries == max_entries) {
+ EFI_PRINT("ESRT full, this should not happen\n");
+ return NULL;
+ }
+
+ /*
+ * This is a new entry for a fw image, increment the element
+ * number in the table and set the fw_class field.
+ */
+ esrt->fw_resource_count++;
+ entry[filled_entries].fw_class = *img_fw_class;
+ EFI_PRINT("ESRT allocated new entry for image %pUl at index %d\n",
+ img_fw_class, filled_entries);
+
+ return &entry[filled_entries];
+}
+
+/**
+ * efi_esrt_add_from_fmp() - Populates a sequence of ESRT entries from the FW
+ * images in the FMP.
+ *
+ * @fmp: the FMP instance from which FW images are added to the ESRT
+ *
+ * Return:
+ * - EFI_SUCCESS if all the FW images in the FMP are added to the ESRT
+ * - Error status otherwise
+ */
+static
+efi_status_t efi_esrt_add_from_fmp(struct efi_firmware_management_protocol *fmp)
+{
+ struct efi_system_resource_entry *entry = NULL;
+ size_t info_size = 0;
+ struct efi_firmware_image_descriptor *img_info = NULL;
+ u32 desc_version;
+ u8 desc_count;
+ size_t desc_size;
+ u32 package_version;
+ u16 *package_version_name;
+ efi_status_t ret = EFI_SUCCESS;
+
+ /*
+ * TODO: set the field image_type depending on the FW image type
+ * defined in a platform basis.
+ */
+ u32 image_type = ESRT_FW_TYPE_UNKNOWN;
+
+ /* TODO: set the capsule flags as a function of the FW image type. */
+ u32 flags = 0;
+
+ ret = EFI_CALL(fmp->get_image_info(fmp, &info_size, img_info,
+ &desc_version, &desc_count,
+ &desc_size, NULL, NULL));
+
+ if (ret != EFI_BUFFER_TOO_SMALL) {
+ /*
+ * An input of info_size=0 should always lead
+ * fmp->get_image_info to return BUFFER_TO_SMALL.
+ */
+ EFI_PRINT("Erroneous FMP implementation\n");
+ return EFI_INVALID_PARAMETER;
+ }
+
+ ret = EFI_CALL(efi_allocate_pool(EFI_BOOT_SERVICES_DATA, info_size,
+ (void **)&img_info));
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to allocate memory for image info.\n");
+ return ret;
+ }
+
+ ret = EFI_CALL(fmp->get_image_info(fmp, &info_size, img_info,
+ &desc_version, &desc_count,
+ &desc_size, &package_version,
+ &package_version_name));
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to obtain the FMP image info\n");
+ goto out;
+ }
+
+ /*
+ * Iterate over all the FW images in the FMP.
+ */
+ for (u32 desc_idx = 0; desc_idx < desc_count; desc_idx++) {
+ struct efi_firmware_image_descriptor *cur_img_info =
+ (struct efi_firmware_image_descriptor *)
+ ((uintptr_t)img_info + desc_idx * desc_size);
+
+ /*
+ * Obtain the ESRT entry for the FW image with fw_class
+ * equal to cur_img_info->image_type_id.
+ */
+ entry = esrt_find_entry(&cur_img_info->image_type_id);
+
+ if (entry) {
+ ret = efi_esrt_image_info_to_entry(cur_img_info, entry,
+ desc_version,
+ image_type, flags);
+ if (ret != EFI_SUCCESS)
+ EFI_PRINT("ESRT entry mismatches image_type\n");
+
+ } else {
+ EFI_PRINT("ESRT failed to add entry for %pUl\n",
+ &cur_img_info->image_type_id);
+ continue;
+ }
+ }
+
+out:
+ EFI_CALL(efi_free_pool(img_info));
+ return EFI_SUCCESS;
+}
+
+/**
+ * efi_esrt_populate() - Populates the ESRT entries from the FMP instances
+ * present in the system.
+ * If an ESRT already exists, the old ESRT is replaced in the system table.
+ * The memory of the old ESRT is deallocated.
+ *
+ * Return:
+ * - EFI_SUCCESS if the ESRT is correctly created
+ * - error code otherwise.
+ */
+efi_status_t efi_esrt_populate(void)
+{
+ efi_handle_t *base_handle = NULL;
+ efi_handle_t *it_handle;
+ size_t no_handles = 0;
+ struct efi_firmware_management_protocol *fmp;
+ efi_status_t ret;
+ u32 num_entries = 0;
+ struct efi_handler *handler;
+
+ /*
+ * Obtain the number of registered FMP handles.
+ */
+ ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL,
+ &efi_guid_firmware_management_protocol,
+ NULL, &no_handles,
+ (efi_handle_t **)&base_handle));
+
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT There are no FMP instances\n");
+
+ ret = efi_esrt_allocate_install(0);
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to create table with 0 entries\n");
+ return ret;
+ }
+ return EFI_SUCCESS;
+ }
+
+ EFI_PRINT("ESRT populate esrt from (%ld) available FMP handles\n",
+ no_handles);
+
+ /*
+ * Iterate over all FMPs to determine an upper bound on the number of
+ * ESRT entries.
+ */
+ it_handle = base_handle;
+ for (u32 idx = 0; idx < no_handles; idx++, it_handle++) {
+ struct efi_firmware_image_descriptor *img_info = NULL;
+ size_t info_size = 0;
+ u32 desc_version = 0;
+ u8 desc_count = 0;
+ size_t desc_size = 0;
+ u32 package_version;
+ u16 *package_version_name;
+
+ ret = efi_search_protocol(*it_handle,
+ &efi_guid_firmware_management_protocol,
+ &handler);
+
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT Unable to find FMP handle (%d)\n",
+ idx);
+ goto out;
+ }
+ fmp = handler->protocol_interface;
+
+ ret = EFI_CALL(fmp->get_image_info(fmp, &info_size, NULL,
+ &desc_version, &desc_count,
+ &desc_size, &package_version,
+ &package_version_name));
+
+ if (ret != EFI_BUFFER_TOO_SMALL) {
+ /*
+ * An input of info_size=0 should always lead
+ * fmp->get_image_info to return BUFFER_TO_SMALL.
+ */
+ EFI_PRINT("ESRT erroneous FMP implementation\n");
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ ret = EFI_CALL(efi_allocate_pool(EFI_BOOT_SERVICES_DATA, info_size,
+ (void **)&img_info));
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to allocate memory for image info\n");
+ goto out;
+ }
+
+ /*
+ * Calls to a FMP get_image_info method do not return the
+ * desc_count value if the return status differs from EFI_SUCCESS.
+ * We need to repeat the call to get_image_info with a properly
+ * sized buffer in order to obtain the real number of images
+ * handled by the FMP.
+ */
+ ret = EFI_CALL(fmp->get_image_info(fmp, &info_size, img_info,
+ &desc_version, &desc_count,
+ &desc_size, &package_version,
+ &package_version_name));
+
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to obtain image info from FMP\n");
+ EFI_CALL(efi_free_pool(img_info));
+ goto out;
+ }
+
+ num_entries += desc_count;
+
+ EFI_CALL(efi_free_pool(img_info));
+ }
+
+ EFI_PRINT("ESRT create table with %d entries\n", num_entries);
+ /*
+ * Allocate an ESRT with the sufficient number of entries to accommodate
+ * all the FMPs in the system.
+ */
+ ret = efi_esrt_allocate_install(num_entries);
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to initialize table\n");
+ goto out;
+ }
+
+ /*
+ * Populate the ESRT entries with all existing FMP.
+ */
+ it_handle = base_handle;
+ for (u32 idx = 0; idx < no_handles; idx++, it_handle++) {
+ ret = EFI_CALL(efi_search_protocol(*it_handle,
+ &efi_guid_firmware_management_protocol,
+ &handler));
+
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT unable to find FMP handle (%d)\n",
+ idx);
+ break;
+ }
+ fmp = handler->protocol_interface;
+
+ ret = efi_esrt_add_from_fmp(fmp);
+ if (ret != EFI_SUCCESS)
+ EFI_PRINT("ESRT failed to add FMP to the table\n");
+ }
+
+out:
+
+ EFI_CALL(efi_free_pool(base_handle));
+
+ return ret;
+}
+
+/**
+ * efi_esrt_new_fmp_notify() - Callback for the EVT_NOTIFY_SIGNAL event raised
+ * when a new FMP protocol instance is registered in the system.
+ */
+static void EFIAPI efi_esrt_new_fmp_notify(struct efi_event *event,
+ void *context)
+{
+ efi_status_t ret;
+
+ EFI_ENTRY();
+
+ ret = efi_esrt_populate();
+ if (ret != EFI_SUCCESS)
+ EFI_PRINT("ESRT failed to populate ESRT entry\n");
+
+ EFI_EXIT(ret);
+}
+
+/**
+ * efi_esrt_register() - Install the ESRT system table.
+ *
+ * Return: status code
+ */
+efi_status_t efi_esrt_register(void)
+{
+ struct efi_event *ev = NULL;
+ void *registration;
+ efi_status_t ret;
+
+ EFI_PRINT("ESRT creation start\n");
+
+ ret = efi_esrt_populate();
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to initiate the table\n");
+ return ret;
+ }
+
+ ret = EFI_CALL(efi_create_event(EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
+ efi_esrt_new_fmp_notify, NULL, NULL, &ev));
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to create event\n");
+ return ret;
+ }
+
+ ret = EFI_CALL(efi_register_protocol_notify(&efi_guid_firmware_management_protocol,
+ ev, ®istration));
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("ESRT failed to register FMP callback\n");
+ return ret;
+ }
+
+ EFI_PRINT("ESRT table created\n");
+
+ return ret;
+}
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index b1c5125032..3c5cf9a435 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -227,6 +227,12 @@ efi_status_t efi_init_obj_list(void)
if (ret != EFI_SUCCESS)
goto out;
+ if (IS_ENABLED(CONFIG_EFI_ESRT)) {
+ ret = efi_esrt_register();
+ if (ret != EFI_SUCCESS)
+ goto out;
+ }
+
if (IS_ENABLED(CONFIG_EFI_TCG2_PROTOCOL)) {
ret = efi_tcg2_register();
if (ret != EFI_SUCCESS)
--
2.17.1
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