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efi_loader: Implement EFI variable handling via OP-TEE
In OP-TEE we can run EDK2's StandAloneMM on a secure partition. StandAloneMM is responsible for the UEFI variable support. In combination with OP-TEE and it's U-Boot supplicant, variables are authenticated/validated in secure world and stored on an RPMB partition. So let's add a new config option in U-Boot implementing the necessary calls to OP-TEE for the variable management. Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Pipat Methavanitpong <pipat1010@gmail.com> Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Ilias Apalodimas
Heinrich Schuchardt
parent
23a397d2e2
commit
f042e47e8f
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@ -164,4 +164,13 @@ config EFI_SECURE_BOOT
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it is signed with a trusted key. To do that, you need to install,
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at least, PK, KEK and db.
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config EFI_MM_COMM_TEE
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bool "UEFI variables storage service via OP-TEE"
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depends on OPTEE
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default n
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help
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If OP-TEE is present and running StandAloneMM, dispatch all UEFI variable
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related operations to that. The application will verify, authenticate and
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store the variables on an RPMB.
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endif
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@ -35,7 +35,11 @@ obj-y += efi_root_node.o
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obj-y += efi_runtime.o
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obj-y += efi_setup.o
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obj-$(CONFIG_EFI_UNICODE_COLLATION_PROTOCOL2) += efi_unicode_collation.o
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ifeq ($(CONFIG_EFI_MM_COMM_TEE),y)
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obj-y += efi_variable_tee.o
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else
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obj-y += efi_variable.o
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endif
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obj-y += efi_watchdog.o
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obj-$(CONFIG_LCD) += efi_gop.o
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obj-$(CONFIG_DM_VIDEO) += efi_gop.o
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662
lib/efi_loader/efi_variable_tee.c
Normal file
662
lib/efi_loader/efi_variable_tee.c
Normal file
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@ -0,0 +1,662 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI variable service via OP-TEE
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*
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* Copyright (C) 2019 Linaro Ltd. <sughosh.ganu@linaro.org>
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* Copyright (C) 2019 Linaro Ltd. <ilias.apalodimas@linaro.org>
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*/
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#include <common.h>
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#include <efi.h>
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#include <efi_api.h>
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#include <efi_loader.h>
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#include <tee.h>
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#include <malloc.h>
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#include <mm_communication.h>
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static efi_uintn_t max_buffer_size; /* comm + var + func + data */
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static efi_uintn_t max_payload_size; /* func + data */
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struct mm_connection {
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struct udevice *tee;
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u32 session;
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};
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/**
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* get_connection() - Retrieve OP-TEE session for a specific UUID.
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*
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* @conn: session buffer to fill
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* Return: status code
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*/
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static int get_connection(struct mm_connection *conn)
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{
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static const struct tee_optee_ta_uuid uuid = PTA_STMM_UUID;
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struct udevice *tee = NULL;
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struct tee_open_session_arg arg;
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int rc;
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tee = tee_find_device(tee, NULL, NULL, NULL);
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if (!tee)
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return -ENODEV;
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memset(&arg, 0, sizeof(arg));
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tee_optee_ta_uuid_to_octets(arg.uuid, &uuid);
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rc = tee_open_session(tee, &arg, 0, NULL);
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if (!rc) {
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conn->tee = tee;
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conn->session = arg.session;
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}
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return rc;
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}
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/**
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* optee_mm_communicate() - Pass a buffer to StandaloneMM running in OP-TEE
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*
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* @comm_buf: locally allocted communcation buffer
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* @dsize: buffer size
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* Return: status code
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*/
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static efi_status_t optee_mm_communicate(void *comm_buf, ulong dsize)
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{
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ulong buf_size;
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efi_status_t ret;
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struct efi_mm_communicate_header *mm_hdr;
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struct mm_connection conn = { NULL, 0 };
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struct tee_invoke_arg arg;
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struct tee_param param[2];
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struct tee_shm *shm = NULL;
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int rc;
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if (!comm_buf)
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return EFI_INVALID_PARAMETER;
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mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
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buf_size = mm_hdr->message_len + sizeof(efi_guid_t) + sizeof(size_t);
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if (dsize != buf_size)
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return EFI_INVALID_PARAMETER;
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rc = get_connection(&conn);
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if (rc) {
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log_err("Unable to open OP-TEE session (err=%d)\n", rc);
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return EFI_UNSUPPORTED;
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}
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if (tee_shm_register(conn.tee, comm_buf, buf_size, 0, &shm)) {
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log_err("Unable to register shared memory\n");
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return EFI_UNSUPPORTED;
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}
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memset(&arg, 0, sizeof(arg));
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arg.func = PTA_STMM_CMDID_COMMUNICATE;
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arg.session = conn.session;
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memset(param, 0, sizeof(param));
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param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INOUT;
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param[0].u.memref.size = buf_size;
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param[0].u.memref.shm = shm;
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param[1].attr = TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT;
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rc = tee_invoke_func(conn.tee, &arg, 2, param);
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if (rc)
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return EFI_INVALID_PARAMETER;
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tee_shm_free(shm);
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tee_close_session(conn.tee, conn.session);
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switch (param[1].u.value.a) {
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case ARM_SMC_MM_RET_SUCCESS:
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ret = EFI_SUCCESS;
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break;
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case ARM_SMC_MM_RET_INVALID_PARAMS:
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ret = EFI_INVALID_PARAMETER;
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break;
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case ARM_SMC_MM_RET_DENIED:
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ret = EFI_ACCESS_DENIED;
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break;
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case ARM_SMC_MM_RET_NO_MEMORY:
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ret = EFI_OUT_OF_RESOURCES;
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break;
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default:
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ret = EFI_ACCESS_DENIED;
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}
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return ret;
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}
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/**
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* mm_communicate() - Adjust the cmonnucation buffer to StandAlonneMM and send
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* it to OP-TEE
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*
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* @comm_buf: locally allocted communcation buffer
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* @dsize: buffer size
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* Return: status code
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*/
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static efi_status_t mm_communicate(u8 *comm_buf, efi_uintn_t dsize)
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{
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efi_status_t ret;
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struct efi_mm_communicate_header *mm_hdr;
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struct smm_variable_communicate_header *var_hdr;
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dsize += MM_COMMUNICATE_HEADER_SIZE + MM_VARIABLE_COMMUNICATE_SIZE;
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mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
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var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data;
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ret = optee_mm_communicate(comm_buf, dsize);
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if (ret != EFI_SUCCESS) {
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log_err("%s failed!\n", __func__);
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return ret;
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}
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return var_hdr->ret_status;
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}
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/**
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* setup_mm_hdr() - Allocate a buffer for StandAloneMM and initialize the
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* header data.
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*
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* @dptr: pointer address of the corresponding StandAloneMM
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* function
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* @payload_size: buffer size
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* @func: standAloneMM function number
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* @ret: EFI return code
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* Return: buffer or NULL
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*/
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static u8 *setup_mm_hdr(void **dptr, efi_uintn_t payload_size,
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efi_uintn_t func, efi_status_t *ret)
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{
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const efi_guid_t mm_var_guid = EFI_MM_VARIABLE_GUID;
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struct efi_mm_communicate_header *mm_hdr;
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struct smm_variable_communicate_header *var_hdr;
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u8 *comm_buf;
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/* In the init function we initialize max_buffer_size with
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* get_max_payload(). So skip the test if max_buffer_size is initialized
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* StandAloneMM will perform similar checks and drop the buffer if it's
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* too long
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*/
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if (max_buffer_size && max_buffer_size <
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(MM_COMMUNICATE_HEADER_SIZE +
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MM_VARIABLE_COMMUNICATE_SIZE +
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payload_size)) {
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*ret = EFI_INVALID_PARAMETER;
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return NULL;
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}
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comm_buf = calloc(1, MM_COMMUNICATE_HEADER_SIZE +
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MM_VARIABLE_COMMUNICATE_SIZE +
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payload_size);
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if (!comm_buf) {
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*ret = EFI_OUT_OF_RESOURCES;
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return NULL;
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}
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mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
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guidcpy(&mm_hdr->header_guid, &mm_var_guid);
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mm_hdr->message_len = MM_VARIABLE_COMMUNICATE_SIZE + payload_size;
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var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data;
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var_hdr->function = func;
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if (dptr)
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*dptr = var_hdr->data;
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*ret = EFI_SUCCESS;
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return comm_buf;
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}
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/**
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* get_max_payload() - Get variable payload size from StandAloneMM.
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*
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* @size: size of the variable in storage
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* Return: status code
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*/
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efi_status_t EFIAPI get_max_payload(efi_uintn_t *size)
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{
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struct smm_variable_payload_size *var_payload = NULL;
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efi_uintn_t payload_size;
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u8 *comm_buf = NULL;
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efi_status_t ret;
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if (!size) {
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ret = EFI_INVALID_PARAMETER;
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goto out;
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}
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payload_size = sizeof(*var_payload);
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comm_buf = setup_mm_hdr((void **)&var_payload, payload_size,
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SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE, &ret);
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if (!comm_buf)
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goto out;
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ret = mm_communicate(comm_buf, payload_size);
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if (ret != EFI_SUCCESS)
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goto out;
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*size = var_payload->size;
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out:
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free(comm_buf);
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return ret;
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}
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/**
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* efi_get_variable() - retrieve value of a UEFI variable
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*
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* This function implements the GetVariable runtime service.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* @name: name of the variable
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* @guid: vendor GUID
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* @attr: attributes of the variable
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* @data_size: size of the buffer to which the variable value is copied
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* @data: buffer to which the variable value is copied
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* Return: status code
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*/
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efi_status_t EFIAPI efi_get_variable(u16 *name, const efi_guid_t *guid,
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u32 *attr, efi_uintn_t *data_size,
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void *data)
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{
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struct smm_variable_access *var_acc;
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efi_uintn_t payload_size;
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efi_uintn_t name_size;
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efi_uintn_t tmp_dsize;
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u8 *comm_buf = NULL;
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efi_status_t ret;
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EFI_ENTRY("\"%ls\" %pUl %p %p %p", name, guid, attr, data_size, data);
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if (!name || !guid || !data_size) {
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ret = EFI_INVALID_PARAMETER;
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goto out;
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}
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/* Check payload size */
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name_size = u16_strsize(name);
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if (name_size > max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE) {
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ret = EFI_INVALID_PARAMETER;
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goto out;
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}
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/* Trim output buffer size */
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tmp_dsize = *data_size;
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if (name_size + tmp_dsize >
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max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE) {
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tmp_dsize = max_payload_size -
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MM_VARIABLE_ACCESS_HEADER_SIZE -
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name_size;
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}
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/* Get communication buffer and initialize header */
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payload_size = MM_VARIABLE_ACCESS_HEADER_SIZE + name_size + tmp_dsize;
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comm_buf = setup_mm_hdr((void **)&var_acc, payload_size,
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SMM_VARIABLE_FUNCTION_GET_VARIABLE, &ret);
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if (!comm_buf)
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goto out;
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/* Fill in contents */
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guidcpy(&var_acc->guid, guid);
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var_acc->data_size = tmp_dsize;
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var_acc->name_size = name_size;
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var_acc->attr = attr ? *attr : 0;
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memcpy(var_acc->name, name, name_size);
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/* Communicate */
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ret = mm_communicate(comm_buf, payload_size);
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if (ret == EFI_SUCCESS || ret == EFI_BUFFER_TOO_SMALL) {
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/* Update with reported data size for trimmed case */
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*data_size = var_acc->data_size;
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}
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if (ret != EFI_SUCCESS)
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goto out;
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if (attr)
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*attr = var_acc->attr;
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if (data)
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memcpy(data, (u8 *)var_acc->name + var_acc->name_size,
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var_acc->data_size);
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else
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ret = EFI_INVALID_PARAMETER;
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out:
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free(comm_buf);
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return EFI_EXIT(ret);
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}
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/**
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* efi_get_next_variable_name() - enumerate the current variable names
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*
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* @variable_name_size: size of variable_name buffer in bytes
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* @variable_name: name of uefi variable's name in u16
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* @guid: vendor's guid
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*
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* This function implements the GetNextVariableName service.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* Return: status code
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*/
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efi_status_t EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
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u16 *variable_name,
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efi_guid_t *guid)
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{
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struct smm_variable_getnext *var_getnext;
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efi_uintn_t payload_size;
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efi_uintn_t out_name_size;
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efi_uintn_t in_name_size;
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efi_uintn_t tmp_dsize;
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efi_uintn_t name_size;
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u8 *comm_buf = NULL;
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efi_status_t ret;
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EFI_ENTRY("%p \"%ls\" %pUl", variable_name_size, variable_name, guid);
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if (!variable_name_size || !variable_name || !guid) {
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ret = EFI_INVALID_PARAMETER;
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goto out;
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}
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out_name_size = *variable_name_size;
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in_name_size = u16_strsize(variable_name);
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if (out_name_size < in_name_size) {
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ret = EFI_INVALID_PARAMETER;
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goto out;
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}
|
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name_size = u16_strsize(variable_name);
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if (name_size > max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE) {
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ret = EFI_INVALID_PARAMETER;
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goto out;
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}
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|
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/* Trim output buffer size */
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tmp_dsize = *variable_name_size;
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if (name_size + tmp_dsize >
|
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max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE) {
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tmp_dsize = max_payload_size -
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MM_VARIABLE_GET_NEXT_HEADER_SIZE -
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name_size;
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}
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payload_size = MM_VARIABLE_GET_NEXT_HEADER_SIZE + out_name_size;
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comm_buf = setup_mm_hdr((void **)&var_getnext, payload_size,
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SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME,
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&ret);
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if (!comm_buf)
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goto out;
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|
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/* Fill in contents */
|
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guidcpy(&var_getnext->guid, guid);
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var_getnext->name_size = out_name_size;
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memcpy(var_getnext->name, variable_name, in_name_size);
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memset((u8 *)var_getnext->name + in_name_size, 0x0,
|
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out_name_size - in_name_size);
|
||||
|
||||
/* Communicate */
|
||||
ret = mm_communicate(comm_buf, payload_size);
|
||||
if (ret == EFI_SUCCESS || ret == EFI_BUFFER_TOO_SMALL) {
|
||||
/* Update with reported data size for trimmed case */
|
||||
*variable_name_size = var_getnext->name_size;
|
||||
}
|
||||
if (ret != EFI_SUCCESS)
|
||||
goto out;
|
||||
|
||||
guidcpy(guid, &var_getnext->guid);
|
||||
memcpy(variable_name, (u8 *)var_getnext->name,
|
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var_getnext->name_size);
|
||||
|
||||
out:
|
||||
free(comm_buf);
|
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return EFI_EXIT(ret);
|
||||
}
|
||||
|
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/**
|
||||
* efi_set_variable() - set value of a UEFI variable
|
||||
*
|
||||
* This function implements the SetVariable runtime service.
|
||||
*
|
||||
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
||||
* details.
|
||||
*
|
||||
* @name: name of the variable
|
||||
* @guid: vendor GUID
|
||||
* @attr: attributes of the variable
|
||||
* @data_size: size of the buffer with the variable value
|
||||
* @data: buffer with the variable value
|
||||
* Return: status code
|
||||
*/
|
||||
efi_status_t EFIAPI efi_set_variable(u16 *name, const efi_guid_t *guid,
|
||||
u32 attr, efi_uintn_t data_size,
|
||||
const void *data)
|
||||
{
|
||||
struct smm_variable_access *var_acc;
|
||||
efi_uintn_t payload_size;
|
||||
efi_uintn_t name_size;
|
||||
u8 *comm_buf = NULL;
|
||||
efi_status_t ret;
|
||||
|
||||
EFI_ENTRY("\"%ls\" %pUl %x %zu %p", name, guid, attr, data_size, data);
|
||||
|
||||
if (!name || name[0] == 0 || !guid) {
|
||||
ret = EFI_INVALID_PARAMETER;
|
||||
goto out;
|
||||
}
|
||||
if (data_size > 0 && !data) {
|
||||
ret = EFI_INVALID_PARAMETER;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Check payload size */
|
||||
name_size = u16_strsize(name);
|
||||
payload_size = MM_VARIABLE_ACCESS_HEADER_SIZE + name_size + data_size;
|
||||
if (payload_size > max_payload_size) {
|
||||
ret = EFI_INVALID_PARAMETER;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Get communication buffer and initialize header */
|
||||
comm_buf = setup_mm_hdr((void **)&var_acc, payload_size,
|
||||
SMM_VARIABLE_FUNCTION_SET_VARIABLE, &ret);
|
||||
if (!comm_buf)
|
||||
goto out;
|
||||
|
||||
/* Fill in contents */
|
||||
guidcpy(&var_acc->guid, guid);
|
||||
var_acc->data_size = data_size;
|
||||
var_acc->name_size = name_size;
|
||||
var_acc->attr = attr;
|
||||
memcpy(var_acc->name, name, name_size);
|
||||
memcpy((u8 *)var_acc->name + name_size, data, data_size);
|
||||
|
||||
/* Communicate */
|
||||
ret = mm_communicate(comm_buf, payload_size);
|
||||
|
||||
out:
|
||||
free(comm_buf);
|
||||
return EFI_EXIT(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_query_variable_info() - get information about EFI variables
|
||||
*
|
||||
* This function implements the QueryVariableInfo() runtime service.
|
||||
*
|
||||
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
||||
* details.
|
||||
*
|
||||
* @attributes: bitmask to select variables to be
|
||||
* queried
|
||||
* @maximum_variable_storage_size: maximum size of storage area for the
|
||||
* selected variable types
|
||||
* @remaining_variable_storage_size: remaining size of storage are for the
|
||||
* selected variable types
|
||||
* @maximum_variable_size: maximum size of a variable of the
|
||||
* selected type
|
||||
* Returns: status code
|
||||
*/
|
||||
efi_status_t EFIAPI __efi_runtime
|
||||
efi_query_variable_info(u32 attributes, u64 *max_variable_storage_size,
|
||||
u64 *remain_variable_storage_size,
|
||||
u64 *max_variable_size)
|
||||
{
|
||||
struct smm_variable_query_info *mm_query_info;
|
||||
efi_uintn_t payload_size;
|
||||
efi_status_t ret;
|
||||
u8 *comm_buf;
|
||||
|
||||
EFI_ENTRY("%x %p %p %p", attributes, max_variable_storage_size,
|
||||
remain_variable_storage_size, max_variable_size);
|
||||
|
||||
payload_size = sizeof(*mm_query_info);
|
||||
comm_buf = setup_mm_hdr((void **)&mm_query_info, payload_size,
|
||||
SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO,
|
||||
&ret);
|
||||
if (!comm_buf)
|
||||
goto out;
|
||||
|
||||
mm_query_info->attr = attributes;
|
||||
ret = mm_communicate(comm_buf, payload_size);
|
||||
if (ret != EFI_SUCCESS)
|
||||
goto out;
|
||||
*max_variable_storage_size = mm_query_info->max_variable_storage;
|
||||
*remain_variable_storage_size =
|
||||
mm_query_info->remaining_variable_storage;
|
||||
*max_variable_size = mm_query_info->max_variable_size;
|
||||
|
||||
out:
|
||||
free(comm_buf);
|
||||
return EFI_EXIT(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_get_variable_runtime() - runtime implementation of GetVariable()
|
||||
*
|
||||
* @variable_name: name of the variable
|
||||
* @guid: vendor GUID
|
||||
* @attributes: attributes of the variable
|
||||
* @data_size: size of the buffer to which the variable value is copied
|
||||
* @data: buffer to which the variable value is copied
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t __efi_runtime EFIAPI
|
||||
efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *guid,
|
||||
u32 *attributes, efi_uintn_t *data_size, void *data)
|
||||
{
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_get_next_variable_name_runtime() - runtime implementation of
|
||||
* GetNextVariable()
|
||||
*
|
||||
* @variable_name_size: size of variable_name buffer in byte
|
||||
* @variable_name: name of uefi variable's name in u16
|
||||
* @guid: vendor's guid
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t __efi_runtime EFIAPI
|
||||
efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size,
|
||||
u16 *variable_name, efi_guid_t *guid)
|
||||
{
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_query_variable_info() - get information about EFI variables
|
||||
*
|
||||
* This function implements the QueryVariableInfo() runtime service.
|
||||
*
|
||||
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
||||
* details.
|
||||
*
|
||||
* @attributes: bitmask to select variables to be
|
||||
* queried
|
||||
* @maximum_variable_storage_size: maximum size of storage area for the
|
||||
* selected variable types
|
||||
* @remaining_variable_storage_size: remaining size of storage are for the
|
||||
* selected variable types
|
||||
* @maximum_variable_size: maximum size of a variable of the
|
||||
* selected type
|
||||
* Return: status code
|
||||
*/
|
||||
efi_status_t EFIAPI __efi_runtime
|
||||
efi_query_variable_info_runtime(u32 attributes, u64 *max_variable_storage_size,
|
||||
u64 *remain_variable_storage_size,
|
||||
u64 *max_variable_size)
|
||||
{
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_set_variable_runtime() - runtime implementation of SetVariable()
|
||||
*
|
||||
* @variable_name: name of the variable
|
||||
* @guid: vendor GUID
|
||||
* @attributes: attributes of the variable
|
||||
* @data_size: size of the buffer with the variable value
|
||||
* @data: buffer with the variable value
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t __efi_runtime EFIAPI
|
||||
efi_set_variable_runtime(u16 *variable_name, const efi_guid_t *guid,
|
||||
u32 attributes, efi_uintn_t data_size,
|
||||
const void *data)
|
||||
{
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_variables_boot_exit_notify() - notify ExitBootServices() is called
|
||||
*/
|
||||
void efi_variables_boot_exit_notify(void)
|
||||
{
|
||||
u8 *comm_buf;
|
||||
efi_status_t ret;
|
||||
|
||||
comm_buf = setup_mm_hdr(NULL, 0,
|
||||
SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE, &ret);
|
||||
if (comm_buf)
|
||||
ret = mm_communicate(comm_buf, 0);
|
||||
else
|
||||
ret = EFI_NOT_FOUND;
|
||||
|
||||
if (ret != EFI_SUCCESS)
|
||||
log_err("Unable to notify StMM for ExitBootServices\n");
|
||||
free(comm_buf);
|
||||
|
||||
/* Update runtime service table */
|
||||
efi_runtime_services.query_variable_info =
|
||||
efi_query_variable_info_runtime;
|
||||
efi_runtime_services.get_variable = efi_get_variable_runtime;
|
||||
efi_runtime_services.get_next_variable_name =
|
||||
efi_get_next_variable_name_runtime;
|
||||
efi_runtime_services.set_variable = efi_set_variable_runtime;
|
||||
efi_update_table_header_crc32(&efi_runtime_services.hdr);
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_init_variables() - initialize variable services
|
||||
*
|
||||
* Return: status code
|
||||
*/
|
||||
efi_status_t efi_init_variables(void)
|
||||
{
|
||||
efi_status_t ret;
|
||||
|
||||
ret = get_max_payload(&max_payload_size);
|
||||
if (ret != EFI_SUCCESS)
|
||||
return ret;
|
||||
|
||||
max_buffer_size = MM_COMMUNICATE_HEADER_SIZE +
|
||||
MM_VARIABLE_COMMUNICATE_SIZE +
|
||||
max_payload_size;
|
||||
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user