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efi_loader: define UpdateCapsule api 

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@linaro.org>
This commit is contained in:
AKASHI Takahiro 2020-11-17 09:27:55 +09:00 committed by Heinrich Schuchardt
parent 96ec4b1a18
commit 2bc27ca8a0
7 changed files with 316 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/efi_api.h
View File

@ -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

13
include/efi_loader.h
View File

@ -210,6 +210,8 @@ 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;
@ -812,6 +814,17 @@ void efi_memcpy_runtime(void *dest, const void *src, size_t n);
/* commonly used helper function */
u16 *efi_create_indexed_name(u16 *buffer, const char *name, unsigned int index);
/* 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 */

11
lib/efi_loader/Kconfig
View File

@ -94,6 +94,17 @@ 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

1
lib/efi_loader/Makefile
View File

@ -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

165
lib/efi_loader/efi_capsule.c Normal file
View File

@ -0,0 +1,165 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* EFI Capsule
*
* Copyright (c) 2018 Linaro Limited
* Author: AKASHI Takahiro
*/
#include <common.h>
#include <efi_loader.h>
#include <efi_variable.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 index
*
* Retrieve the index of the capsule invoked last time from "CapsuleLast"
* variable.
*
* Return:
* * > 0 - the last capsule index invoked
* * 0xffff - on error, or no capsule invoked yet
*/
static __maybe_unused unsigned int get_last_capsule(void)
{
u16 value16[11]; /* "CapsuleXXXX": non-null-terminated */
char value[11], *p;
efi_uintn_t size;
unsigned long index = 0xffff;
efi_status_t ret;
size = sizeof(value16);
ret = efi_get_variable_int(L"CapsuleLast", &efi_guid_capsule_report,
NULL, &size, value16, NULL);
if (ret != EFI_SUCCESS || u16_strncmp(value16, L"Capsule", 7))
goto err;
p = value;
utf16_utf8_strcpy(&p, value16);
strict_strtoul(&value[7], 16, &index);
err:
return index;
}
/**
* 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 index, struct efi_capsule_header *capsule,
efi_status_t return_status)
{
u16 variable_name16[12];
struct efi_capsule_result_variable_header result;
struct efi_time time;
efi_status_t ret;
efi_create_indexed_name(variable_name16, "Capsule", index);
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_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 %ls failed\n", variable_name16);
}
/**
* 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_UNSUPPORTED;
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);
}

104
lib/efi_loader/efi_runtime.c
View File

@ -133,6 +133,10 @@ 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);
@ -448,6 +452,50 @@ 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 array 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
*
@ -471,6 +519,13 @@ 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);
@ -879,50 +934,6 @@ 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,
@ -940,7 +951,12 @@ 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,
};

64
lib/efi_loader/efi_setup.c
View File

@ -100,9 +100,9 @@ static efi_status_t efi_init_secure_boot(void)
ret = efi_set_variable_int(L"SignatureSupport",
&efi_global_variable_guid,
EFI_VARIABLE_READ_ONLY |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS |
EFI_VARIABLE_READ_ONLY,
EFI_VARIABLE_RUNTIME_ACCESS,
sizeof(signature_types),
&signature_types, false);
if (ret != EFI_SUCCESS)
@ -117,6 +117,53 @@ static efi_status_t efi_init_secure_boot(void)
}
#endif /* CONFIG_EFI_SECURE_BOOT */
/**
* efi_init_capsule - initialize capsule update state
*
* Return: status code
*/
static efi_status_t efi_init_capsule(void)
{
efi_status_t ret = EFI_SUCCESS;
if (IS_ENABLED(CONFIG_EFI_HAVE_CAPSULE_UPDATE)) {
ret = efi_set_variable_int(L"CapsuleMax",
&efi_guid_capsule_report,
EFI_VARIABLE_READ_ONLY |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
22, L"CapsuleFFFF", false);
if (ret != EFI_SUCCESS)
printf("EFI: cannot initialize CapsuleMax variable\n");
}
return ret;
}
/**
* 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_set_variable_int(L"OsIndicationsSupported",
&efi_global_variable_guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS |
EFI_VARIABLE_READ_ONLY,
sizeof(os_indications_supported),
&os_indications_supported, false);
}
/**
* efi_init_obj_list() - Initialize and populate EFI object list
*
@ -124,7 +171,6 @@ 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 */
@ -168,13 +214,7 @@ efi_status_t efi_init_obj_list(void)
goto out;
/* Indicate supported features */
ret = efi_set_variable_int(L"OsIndicationsSupported",
&efi_global_variable_guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS |
EFI_VARIABLE_READ_ONLY,
sizeof(os_indications_supported),
&os_indications_supported, false);
ret = efi_init_os_indications();
if (ret != EFI_SUCCESS)
goto out;
@ -233,6 +273,10 @@ efi_status_t efi_init_obj_list(void)
if (ret != EFI_SUCCESS)
goto out;
ret = efi_init_capsule();
if (ret != EFI_SUCCESS)
goto out;
/* Initialize EFI runtime services */
ret = efi_reset_system_init();
if (ret != EFI_SUCCESS)