efi: Create ECPT table

The ECPT table will be included in the UEFI specification 2.9+.
The ECPT table was introduced in UEFI following the code-first path. The
acceptance ticket can be viewed at:
	https://bugzilla.tianocore.org/show_bug.cgi?id=3591

The Conformance Profiles table is a UEFI configuration table that contains
GUID of the UEFI profiles that the UEFI implementation conforms with.

The ECPT table is created when CONFIG_EFI_ECPT=y.
The config is set by default.

Signed-off-by: Jose Marinho <jose.marinho@arm.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

include/efi_api.h

@@ -226,6 +226,18 @@ enum efi_reset_type {
 	EFI_GUID(0x6dcbd5ed, 0xe82d, 0x4c44, 0xbd, 0xa1, \
 		 0x71, 0x94, 0x19, 0x9a, 0xd9, 0x2a)
 
+#define EFI_CONFORMANCE_PROFILES_TABLE_GUID \
+	EFI_GUID(0x36122546, 0xf7ef, 0x4c8f, 0xbd, 0x9b, \
+		 0xeb, 0x85, 0x25, 0xb5, 0x0c, 0x0b)
+
+#define EFI_CONFORMANCE_PROFILES_TABLE_VERSION 1
+
+struct efi_conformance_profiles_table {
+	u16 version;
+	u16 number_of_profiles;
+	efi_guid_t	conformance_profiles[];
+} __packed;
+
 struct efi_capsule_header {
 	efi_guid_t capsule_guid;
 	u32 header_size;

include/efi_loader.h

@@ -1052,6 +1052,13 @@ extern u8 num_image_type_guids;
  */
 efi_status_t efi_esrt_register(void);
 
+/**
+ * efi_ecpt_register() - Install the ECPT system table.
+ *
+ * Return: status code
+ */
+efi_status_t efi_ecpt_register(void);
+
 /**
  * efi_esrt_populate() - Populates the ESRT entries from the FMP instances
  * present in the system.

lib/efi_loader/Kconfig

@@ -385,6 +385,12 @@ config EFI_ESRT
 	help
 	  Enabling this option creates the ESRT UEFI system table.
 
+config EFI_ECPT
+	bool "Enable the UEFI ECPT generation"
+	default y
+	help
+	  Enabling this option created the ECPT UEFI table.
+
 config EFI_RISCV_BOOT_PROTOCOL
 	bool "RISCV_EFI_BOOT_PROTOCOL support"
 	default y

lib/efi_loader/Makefile

@@ -76,6 +76,7 @@ obj-$(CONFIG_EFI_TCG2_PROTOCOL) += efi_tcg2.o
 obj-$(CONFIG_EFI_RISCV_BOOT_PROTOCOL) += efi_riscv.o
 obj-$(CONFIG_EFI_LOAD_FILE2_INITRD) += efi_load_initrd.o
 obj-$(CONFIG_EFI_SIGNATURE_SUPPORT) += efi_signature.o
+obj-$(CONFIG_EFI_ECPT) += efi_conformance.o
 
 EFI_VAR_SEED_FILE := $(subst $\",,$(CONFIG_EFI_VAR_SEED_FILE))
 $(obj)/efi_var_seed.o: $(srctree)/$(EFI_VAR_SEED_FILE)

lib/efi_loader/efi_conformance.c

@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  EFI conformance profile table
+ *
+ *  Copyright (C) 2022 Arm Ltd.
+ */
+
+#include <common.h>
+#include <efi_loader.h>
+#include <log.h>
+#include <efi_api.h>
+#include <malloc.h>
+
+static const efi_guid_t efi_ecpt_guid = EFI_CONFORMANCE_PROFILES_TABLE_GUID;
+
+/**
+ * efi_ecpt_register() - Install the ECPT system table.
+ *
+ * Return: status code
+ */
+efi_status_t efi_ecpt_register(void)
+{
+	int num_entries = 0;
+	struct efi_conformance_profiles_table *ecpt;
+	efi_status_t ret;
+	size_t ecpt_size;
+
+	ecpt_size = num_entries * sizeof(efi_guid_t)
+		+ sizeof(struct efi_conformance_profiles_table);
+	ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, ecpt_size,
+				(void **)&ecpt);
+
+	if (ret != EFI_SUCCESS) {
+		log_err("Out of memory\n");
+
+		return ret;
+	}
+
+	ecpt->version = EFI_CONFORMANCE_PROFILES_TABLE_VERSION;
+	ecpt->number_of_profiles = num_entries;
+
+	/* Install the ECPT in the system configuration table. */
+	ret = efi_install_configuration_table(&efi_ecpt_guid, (void *)ecpt);
+	if (ret != EFI_SUCCESS) {
+		log_err("Failed to install ECPT\n");
+		efi_free_pool(ecpt);
+
+		return ret;
+	}
+
+	log_debug("ECPT created\n");
+
+	return EFI_SUCCESS;
+}

lib/efi_loader/efi_setup.c

@@ -274,6 +274,12 @@ efi_status_t efi_init_obj_list(void)
 	if (ret != EFI_SUCCESS)
 		goto out;
 
+	if (IS_ENABLED(CONFIG_EFI_ECPT)) {
+		ret = efi_ecpt_register();
+		if (ret != EFI_SUCCESS)
+			goto out;
+	}
+
 	if (IS_ENABLED(CONFIG_EFI_ESRT)) {
 		ret = efi_esrt_register();
 		if (ret != EFI_SUCCESS)

lib/uuid.c

@@ -220,6 +220,10 @@ static const struct {
 		"TCG2 Final Events Table",
 		EFI_TCG2_FINAL_EVENTS_TABLE_GUID,
 	},
+	{
+		"EFI Conformance Profiles Table",
+		EFI_CONFORMANCE_PROFILES_TABLE_GUID,
+	},
 #ifdef CONFIG_EFI_RISCV_BOOT_PROTOCOL
 	{
 		"RISC-V Boot",