[PATCH v4 2/4] efi: add EFI_DEBUG_IMAGE_INFO_TABLE for debug

[Ying-Chun Liu (PaulLiu)]

From: "Ying-Chun Liu (PaulLiu)" <paul.liu at linaro.org>

EFI_DEBUG_IMAGE_INFO_TABLE is used to store EFI_LOADED_IMAGE for
debug purpose. This commit adds the table to the EFI_CONFIGURATION_TABLE.

This feature is described in UEFI Spec version 2.10. Section 18.4.
The implementation ensures support for hardware-assisted debugging and
provides a standardized mechanism for debuggers to discover and interact
with system-level debug resources.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu at linaro.org>
Cc: Heinrich Schuchardt <xypron.glpk at gmx.de>
Cc: Ilias Apalodimas <ilias.apalodimas at linaro.org>
Cc: Peter Robinson <pbrobinson at gmail.com>
Cc: Simon Glass <sjg at chromium.org>
---
V3: Fix the way of installation of configuration table.
---
 include/efi_api.h          | 53 ++++++++++++++++++++++++++++++++++++++
 include/efi_loader.h       |  2 ++
 lib/efi_loader/efi_setup.c | 17 ++++++++++++
 3 files changed, 72 insertions(+)

diff --git a/include/efi_api.h b/include/efi_api.h
index 6c4c1a0cc7b..8da0a350ce3 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -238,6 +238,10 @@ enum efi_reset_type {
 	EFI_GUID(0xcce33c35, 0x74ac, 0x4087, 0xbc, 0xe7, \
 		 0x8b, 0x29, 0xb0, 0x2e, 0xeb, 0x27)
 
+#define EFI_DEBUG_IMAGE_INFO_TABLE_GUID \
+	EFI_GUID(0x49152e77, 0x1ada, 0x4764, 0xb7, 0xa2, \
+		 0x7a, 0xfe, 0xfe, 0xd9, 0x5e, 0x8b)
+
 struct efi_conformance_profiles_table {
 	u16 version;
 	u16 number_of_profiles;
@@ -574,6 +578,55 @@ struct efi_loaded_image {
 	efi_status_t (EFIAPI *unload)(efi_handle_t image_handle);
 };
 
+#define EFI_DEBUG_IMAGE_INFO_UPDATE_IN_PROGRESS 0x01
+#define EFI_DEBUG_IMAGE_INFO_TABLE_MODIFIED     0x02
+
+/**
+ * struct efi_debug_image_info_normal - Store Debug Information for normal
+ * image.
+ * @image_info_type: the type of image info.
+ * @loaded_image_protocol_instance: the pointer to struct efi_loaded_image.
+ * @image_handle: the EFI handle of the image.
+ *
+ * This struct is created by efi_load_image() and store the information
+ * for debugging an normal image.
+ */
+struct efi_debug_image_info_normal {
+	u32 image_info_type;
+	struct efi_loaded_image *loaded_image_protocol_instance;
+	efi_handle_t image_handle;
+};
+
+/**
+ * union efi_debug_image_info - The union to store a pointer for EFI
+ * DEBUG IMAGE INFO.
+ * @image_info_type: the type of the image_info if it is not a normal image.
+ * @normal_image: The pointer to a normal image.
+ *
+ * This union is for a pointer that can point to the struct of normal_image.
+ * Or it points to an image_info_type.
+ */
+union efi_debug_image_info {
+	u32 *image_info_type;
+	struct efi_debug_image_info_normal *normal_image;
+};
+
+/**
+ * struct efi_debug_image_info_table_header - store the array of
+ * struct efi_debug_image_info.
+ * @update_status: Status to notify this struct is ready to use or not.
+ * @table_size: The number of elements of efi_debug_image_info_table.
+ * @efi_debug_image_info_table: The array of efi_debug_image_info.
+ *
+ * This struct stores the array of efi_debug_image_info. The
+ * number of elements is table_size.
+ */
+struct efi_debug_image_info_table_header {
+	volatile u32 update_status;
+	u32 table_size;
+	union efi_debug_image_info *efi_debug_image_info_table;
+};
+
 #define EFI_DEVICE_PATH_PROTOCOL_GUID \
 	EFI_GUID(0x09576e91, 0x6d3f, 0x11d2, \
 		 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b)
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 8f065244d8e..d0c72d0bc58 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -315,6 +315,8 @@ extern const struct efi_hii_config_routing_protocol efi_hii_config_routing;
 extern const struct efi_hii_config_access_protocol efi_hii_config_access;
 extern const struct efi_hii_database_protocol efi_hii_database;
 extern const struct efi_hii_string_protocol efi_hii_string;
+/* structure for EFI_DEBUG_SUPPORT_PROTOCOL */
+extern struct efi_debug_image_info_table_header efi_m_debug_info_table_header;
 
 uint16_t *efi_dp_str(struct efi_device_path *dp);
 
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index a6b37d994f6..e949100593f 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -18,6 +18,15 @@
 
 efi_status_t efi_obj_list_initialized = OBJ_LIST_NOT_INITIALIZED;
 
+struct efi_debug_image_info_table_header efi_m_debug_info_table_header = {
+	0,
+	0,
+	NULL
+};
+
+const efi_guid_t efi_debug_image_info_table_guid =
+	EFI_DEBUG_IMAGE_INFO_TABLE_GUID;
+
 /*
  * Allow unaligned memory access.
  *
@@ -280,10 +289,18 @@ efi_status_t efi_init_obj_list(void)
 
 	/* Initialize system table pointer */
 	if (IS_ENABLED(CONFIG_EFI_DEBUG_SUPPORT_TABLE)) {
+		efi_guid_t debug_image_info_table_guid =
+			efi_debug_image_info_table_guid;
 		ret = efi_initialize_system_table_pointer();
 		if (ret != EFI_SUCCESS) {
 			goto out;
 		}
+
+		ret = efi_install_configuration_table(&debug_image_info_table_guid,
+						      &efi_m_debug_info_table_header);
+		if (ret != EFI_SUCCESS) {
+			goto out;
+		}
 	}
 
 	if (IS_ENABLED(CONFIG_EFI_ECPT)) {
-- 
2.39.5