diff mbox series

[v2,07/17] efi_loader: define UpdateCapsule api

Message ID 20200617025515.23585-8-takahiro.akashi@linaro.org
State Superseded
Headers show
Series efi_loader: add capsule update support | expand

Commit Message

AKASHI Takahiro June 17, 2020, 2:55 a.m. UTC
In this commit, skeleton functions for capsule-related API's are
added under CONFIG_EFI_UPDATE_CAPSULE configuration.
Detailed implementation for a specific capsule type will be added
in the succeeding patches.

Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
 include/efi_api.h            |  12 +++
 include/efi_loader.h         |  13 +++
 lib/efi_loader/Kconfig       |  11 +++
 lib/efi_loader/Makefile      |   1 +
 lib/efi_loader/efi_capsule.c | 168 +++++++++++++++++++++++++++++++++++
 lib/efi_loader/efi_runtime.c | 104 +++++++++++++---------
 lib/efi_loader/efi_setup.c   |  31 +++++--
 7 files changed, 289 insertions(+), 51 deletions(-)
 create mode 100644 lib/efi_loader/efi_capsule.c
diff mbox series

Patch

diff --git a/include/efi_api.h b/include/efi_api.h
index 759d9118758e..4be01495f096 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -217,6 +217,10 @@  enum efi_reset_type {
 #define CAPSULE_FLAGS_POPULATE_SYSTEM_TABLE	0x00020000
 #define CAPSULE_FLAGS_INITIATE_RESET		0x00040000
 
+#define EFI_CAPSULE_REPORT_GUID \
+	EFI_GUID(0x39b68c46, 0xf7fb, 0x441b, 0xb6, 0xec, \
+		 0x16, 0xb0, 0xf6, 0x98, 0x21, 0xf3)
+
 struct efi_capsule_header {
 	efi_guid_t capsule_guid;
 	u32 header_size;
@@ -224,6 +228,14 @@  struct efi_capsule_header {
 	u32 capsule_image_size;
 } __packed;
 
+struct efi_capsule_result_variable_header {
+	u32 variable_total_size;
+	u32 reserved;
+	efi_guid_t capsule_guid;
+	struct efi_time capsule_processed;
+	efi_status_t capsule_status;
+} __packed;
+
 #define EFI_RT_SUPPORTED_GET_TIME			0x0001
 #define EFI_RT_SUPPORTED_SET_TIME			0x0002
 #define EFI_RT_SUPPORTED_GET_WAKEUP_TIME		0x0004
diff --git a/include/efi_loader.h b/include/efi_loader.h
index c2cae814b652..20b263201ec5 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -205,6 +205,8 @@  extern const efi_guid_t efi_guid_cert_type_pkcs7;
 
 /* GUID of RNG protocol */
 extern const efi_guid_t efi_guid_rng_protocol;
+/* GUID of capsule update result */
+extern const efi_guid_t efi_guid_capsule_report;
 
 extern unsigned int __efi_runtime_start, __efi_runtime_stop;
 extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
@@ -783,6 +785,17 @@  bool efi_secure_boot_enabled(void);
 bool efi_image_parse(void *efi, size_t len, struct efi_image_regions **regp,
 		     WIN_CERTIFICATE **auth, size_t *auth_len);
 
+/* Capsule update */
+efi_status_t EFIAPI efi_update_capsule(
+		struct efi_capsule_header **capsule_header_array,
+		efi_uintn_t capsule_count,
+		u64 scatter_gather_list);
+efi_status_t EFIAPI efi_query_capsule_caps(
+		struct efi_capsule_header **capsule_header_array,
+		efi_uintn_t capsule_count,
+		u64 *maximum_capsule_size,
+		u32 *reset_type);
+
 #else /* CONFIG_IS_ENABLED(EFI_LOADER) */
 
 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 37034894870e..356f4ac60e92 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -45,6 +45,17 @@  config EFI_SET_TIME
 	  Provide the SetTime() runtime service at boottime. This service
 	  can be used by an EFI application to adjust the real time clock.
 
+config EFI_HAVE_CAPSULE_SUPPORT
+	bool
+
+config EFI_RUNTIME_UPDATE_CAPSULE
+	bool "UpdateCapsule() runtime service"
+	default n
+	select EFI_HAVE_CAPSULE_SUPPORT
+	help
+	  Select this option if you want to use UpdateCapsule and
+	  QueryCapsuleCapabilities API's.
+
 config EFI_DEVICE_PATH_TO_TEXT
 	bool "Device path to text protocol"
 	default y
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 57c7e66ea0e2..67bc5c9c0907 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -23,6 +23,7 @@  endif
 obj-$(CONFIG_CMD_BOOTEFI_HELLO) += helloworld_efi.o
 obj-y += efi_bootmgr.o
 obj-y += efi_boottime.o
+obj-$(CONFIG_EFI_HAVE_CAPSULE_SUPPORT) += efi_capsule.o
 obj-y += efi_console.o
 obj-y += efi_device_path.o
 obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_device_path_to_text.o
diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
new file mode 100644
index 000000000000..cfe422bee924
--- /dev/null
+++ b/lib/efi_loader/efi_capsule.c
@@ -0,0 +1,168 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  EFI Capsule
+ *
+ *  Copyright (c) 2018 Linaro Limited
+ *			Author: AKASHI Takahiro
+ */
+
+#include <common.h>
+#include <efi_loader.h>
+#include <fs.h>
+#include <malloc.h>
+#include <sort.h>
+
+const efi_guid_t efi_guid_capsule_report = EFI_CAPSULE_REPORT_GUID;
+
+/**
+ * get_last_capsule - get the last capsule number
+ *
+ * Retrieve the number of capsule invoked last time from "CapsuleLast"
+ * variable.
+ *
+ * Return:
+ * * > 0	- the last capsule number invoked
+ * * 0xffff	- on error, or no capsule invoked yet
+ */
+static __maybe_unused int get_last_capsule(void)
+{
+	u16 value16[11]; /* "CapsuleXXXX": non-null-terminated */
+	char value[11], *p;
+	efi_uintn_t size;
+	unsigned long num = 0xffff;
+	efi_status_t ret;
+
+	size = sizeof(value16);
+	ret = EFI_CALL(efi_get_variable(L"CapsuleLast",
+					&efi_guid_capsule_report,
+					NULL, &size, value16));
+	if (ret != EFI_SUCCESS || u16_strncmp(value16, L"Capsule", 7))
+		goto err;
+
+	p = value;
+	utf16_utf8_strcpy(&p, value16);
+	strict_strtoul(&value[7], 16, &num);
+err:
+	return (int)num;
+}
+
+/**
+ * set_capsule_result - set a result variable
+ * @capsule:		Capsule
+ * @return_status:	Return status
+ *
+ * Create and set a result variable, "CapsuleXXXX", for the capsule,
+ * @capsule.
+ */
+static __maybe_unused
+void set_capsule_result(int num, struct efi_capsule_header *capsule,
+			efi_status_t return_status)
+{
+	char variable_name[12];
+	u16 variable_name16[12], *p;
+	struct efi_capsule_result_variable_header result;
+	struct efi_time time;
+	efi_status_t ret;
+
+	sprintf(variable_name, "Capsule%04X", num);
+	p = variable_name16;
+	utf8_utf16_strncpy(&p, variable_name, 11);
+	result.variable_total_size = sizeof(result);
+	result.capsule_guid = capsule->capsule_guid;
+	ret = EFI_CALL((*efi_runtime_services.get_time)(&time, NULL));
+	if (ret == EFI_SUCCESS)
+		memcpy(&result.capsule_processed, &time, sizeof(time));
+	else
+		memset(&result.capsule_processed, 0, sizeof(time));
+	result.capsule_status = return_status;
+	ret = EFI_CALL(efi_set_variable(variable_name16,
+					&efi_guid_capsule_report,
+					EFI_VARIABLE_NON_VOLATILE |
+					EFI_VARIABLE_BOOTSERVICE_ACCESS |
+					EFI_VARIABLE_RUNTIME_ACCESS,
+					sizeof(result), &result));
+	if (ret)
+		printf("EFI: creating %s failed\n", variable_name);
+}
+
+/**
+ * efi_update_capsule() - process information from operating system
+ * @capsule_header_array:	Array of virtual address pointers
+ * @capsule_count:		Number of pointers in capsule_header_array
+ * @scatter_gather_list:	Array of physical address pointers
+ *
+ * This function implements the UpdateCapsule() runtime service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * Return:			status code
+ */
+efi_status_t EFIAPI efi_update_capsule(
+		struct efi_capsule_header **capsule_header_array,
+		efi_uintn_t capsule_count,
+		u64 scatter_gather_list)
+{
+	struct efi_capsule_header *capsule;
+	unsigned int i;
+	efi_status_t ret;
+
+	EFI_ENTRY("%p, %lu, %llu\n", capsule_header_array, capsule_count,
+		  scatter_gather_list);
+
+	if (!capsule_count) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	ret = EFI_SUCCESS;
+	for (i = 0, capsule = *capsule_header_array; i < capsule_count;
+	     i++, capsule = *(++capsule_header_array)) {
+	}
+out:
+	return EFI_EXIT(ret);
+}
+
+/**
+ * efi_query_capsule_caps() - check if capsule is supported
+ * @capsule_header_array:	Array of virtual pointers
+ * @capsule_count:		Number of pointers in capsule_header_array
+ * @maximum_capsule_size:	Maximum capsule size
+ * @reset_type:			Type of reset needed for capsule update
+ *
+ * This function implements the QueryCapsuleCapabilities() runtime service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * Return:			status code
+ */
+efi_status_t EFIAPI efi_query_capsule_caps(
+		struct efi_capsule_header **capsule_header_array,
+		efi_uintn_t capsule_count,
+		u64 *maximum_capsule_size,
+		u32 *reset_type)
+{
+	struct efi_capsule_header *capsule __attribute__((unused));
+	unsigned int i;
+	efi_status_t ret;
+
+	EFI_ENTRY("%p, %lu, %p, %p\n", capsule_header_array, capsule_count,
+		  maximum_capsule_size, reset_type);
+
+	if (!maximum_capsule_size) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	*maximum_capsule_size = U64_MAX;
+	*reset_type = EFI_RESET_COLD;
+
+	ret = EFI_SUCCESS;
+	for (i = 0, capsule = *capsule_header_array; i < capsule_count;
+	     i++, capsule = *(++capsule_header_array)) {
+		/* TODO */
+	}
+out:
+	return EFI_EXIT(ret);
+}
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index c0bd99b86746..d5a4ac1590ae 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -131,6 +131,10 @@  efi_status_t efi_init_runtime_supported(void)
 #ifdef CONFIG_EFI_HAVE_RUNTIME_RESET
 	rt_table->runtime_services_supported |= EFI_RT_SUPPORTED_RESET_SYSTEM;
 #endif
+	if (IS_ENABLED(CONFIG_EFI_RUNTIME_UPDATE_CAPSULE))
+		rt_table->runtime_services_supported |=
+			(EFI_RT_SUPPORTED_UPDATE_CAPSULE |
+			 EFI_RT_SUPPORTED_QUERY_CAPSULE_CAPABILITIES);
 
 	ret = efi_install_configuration_table(&efi_rt_properties_table_guid,
 					      rt_table);
@@ -411,6 +415,50 @@  efi_status_t __weak __efi_runtime EFIAPI efi_set_time(struct efi_time *time)
 	return EFI_UNSUPPORTED;
 }
 
+/**
+ * efi_update_capsule_unsupported() - process information from operating system
+ *
+ * This function implements the UpdateCapsule() runtime service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @capsule_header_array:	pointer to array of virtual pointers
+ * @capsule_count:		number of pointers in capsule_header_array
+ * @scatter_gather_list:	pointer to arry of physical pointers
+ * Returns:			status code
+ */
+efi_status_t __efi_runtime EFIAPI efi_update_capsule_unsupported(
+			struct efi_capsule_header **capsule_header_array,
+			efi_uintn_t capsule_count,
+			u64 scatter_gather_list)
+{
+	return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_query_capsule_caps_unsupported() - check if capsule is supported
+ *
+ * This function implements the QueryCapsuleCapabilities() runtime service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @capsule_header_array:	pointer to array of virtual pointers
+ * @capsule_count:		number of pointers in capsule_header_array
+ * @maximum_capsule_size:	maximum capsule size
+ * @reset_type:			type of reset needed for capsule update
+ * Returns:			status code
+ */
+efi_status_t __efi_runtime EFIAPI efi_query_capsule_caps_unsupported(
+			struct efi_capsule_header **capsule_header_array,
+			efi_uintn_t capsule_count,
+			u64 *maximum_capsule_size,
+			u32 *reset_type)
+{
+	return EFI_UNSUPPORTED;
+}
+
 /**
  * efi_is_runtime_service_pointer() - check if pointer points to runtime table
  *
@@ -434,6 +482,13 @@  void efi_runtime_detach(void)
 	efi_runtime_services.reset_system = efi_reset_system;
 	efi_runtime_services.get_time = efi_get_time;
 	efi_runtime_services.set_time = efi_set_time;
+	if (IS_ENABLED(CONFIG_EFI_RUNTIME_UPDATE_CAPSULE)) {
+		/* won't support at runtime */
+		efi_runtime_services.update_capsule =
+				efi_update_capsule_unsupported;
+		efi_runtime_services.query_capsule_caps =
+				efi_query_capsule_caps_unsupported;
+	}
 
 	/* Update CRC32 */
 	efi_update_table_header_crc32(&efi_runtime_services.hdr);
@@ -837,50 +892,6 @@  static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void)
 	return EFI_UNSUPPORTED;
 }
 
-/**
- * efi_update_capsule() - process information from operating system
- *
- * This function implements the UpdateCapsule() runtime service.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * @capsule_header_array:	pointer to array of virtual pointers
- * @capsule_count:		number of pointers in capsule_header_array
- * @scatter_gather_list:	pointer to arry of physical pointers
- * Returns:			status code
- */
-efi_status_t __efi_runtime EFIAPI efi_update_capsule(
-			struct efi_capsule_header **capsule_header_array,
-			efi_uintn_t capsule_count,
-			u64 scatter_gather_list)
-{
-	return EFI_UNSUPPORTED;
-}
-
-/**
- * efi_query_capsule_caps() - check if capsule is supported
- *
- * This function implements the QueryCapsuleCapabilities() runtime service.
- *
- * See the Unified Extensible Firmware Interface (UEFI) specification for
- * details.
- *
- * @capsule_header_array:	pointer to array of virtual pointers
- * @capsule_count:		number of pointers in capsule_header_array
- * @maximum_capsule_size:	maximum capsule size
- * @reset_type:			type of reset needed for capsule update
- * Returns:			status code
- */
-efi_status_t __efi_runtime EFIAPI efi_query_capsule_caps(
-			struct efi_capsule_header **capsule_header_array,
-			efi_uintn_t capsule_count,
-			u64 *maximum_capsule_size,
-			u32 *reset_type)
-{
-	return EFI_UNSUPPORTED;
-}
-
 struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
 	.hdr = {
 		.signature = EFI_RUNTIME_SERVICES_SIGNATURE,
@@ -898,7 +909,12 @@  struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
 	.set_variable = efi_set_variable,
 	.get_next_high_mono_count = (void *)&efi_unimplemented,
 	.reset_system = &efi_reset_system_boottime,
+#ifdef CONFIG_EFI_RUNTIME_UPDATE_CAPSULE
 	.update_capsule = efi_update_capsule,
 	.query_capsule_caps = efi_query_capsule_caps,
+#else
+	.update_capsule = efi_update_capsule_unsupported,
+	.query_capsule_caps = efi_query_capsule_caps_unsupported,
+#endif
 	.query_variable_info = efi_query_variable_info,
 };
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index 671f6da12b30..e6e094f7b114 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -115,6 +115,29 @@  static efi_status_t efi_init_secure_boot(void)
 }
 #endif /* CONFIG_EFI_SECURE_BOOT */
 
+/**
+ * efi_init_os_indications() - indicate supported features for OS requests
+ *
+ * Set the OsIndicationsSupported variable.
+ *
+ * Return:	status code
+ */
+static efi_status_t efi_init_os_indications(void)
+{
+	u64 os_indications_supported = 0;
+
+	if (IS_ENABLED(CONFIG_EFI_HAVE_CAPSULE_SUPPORT))
+		os_indications_supported |=
+			EFI_OS_INDICATIONS_CAPSULE_RESULT_VAR_SUPPORTED;
+
+	return EFI_CALL(efi_set_variable(L"OsIndicationsSupported",
+					 &efi_global_variable_guid,
+					 EFI_VARIABLE_BOOTSERVICE_ACCESS |
+					 EFI_VARIABLE_RUNTIME_ACCESS,
+					 sizeof(os_indications_supported),
+					 &os_indications_supported));
+}
+
 /**
  * efi_init_obj_list() - Initialize and populate EFI object list
  *
@@ -122,7 +145,6 @@  static efi_status_t efi_init_secure_boot(void)
  */
 efi_status_t efi_init_obj_list(void)
 {
-	u64 os_indications_supported = 0; /* None */
 	efi_status_t ret = EFI_SUCCESS;
 
 	/* Initialize once only */
@@ -160,12 +182,7 @@  efi_status_t efi_init_obj_list(void)
 		goto out;
 
 	/* Indicate supported features */
-	ret = EFI_CALL(efi_set_variable(L"OsIndicationsSupported",
-					&efi_global_variable_guid,
-					EFI_VARIABLE_BOOTSERVICE_ACCESS |
-					EFI_VARIABLE_RUNTIME_ACCESS,
-					sizeof(os_indications_supported),
-					&os_indications_supported));
+	ret = efi_init_os_indications();
 	if (ret != EFI_SUCCESS)
 		goto out;