Merge tag 'efi-2020-07-rc3' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi
Pull request for UEFI sub-system for efi-2020-07-rc3
A series of patches introduces the possibility to manage UEFI variables
via an OP-TEE module. CONFIG_EFI_MM_COMM_TEE enables this. If this
option is not specified the U-Boot behavior remains unchanged. A defconfig
is provided for compile testing (lx2160ardb_tfa_stmm_defconfig).
An incorrect UEFI memory allocation for fsl-layerscape is fixed
diff --git a/MAINTAINERS b/MAINTAINERS
index d671124..8add9d4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -635,6 +635,12 @@
F: cmd/nvedit_efi.c
F: tools/file2include.c
+EFI VARIABLES VIA OP-TEE
+M: Ilias Apalodimas <ilias.apalodimas@linaro.org>
+S: Maintained
+F: lib/efi_loader/efi_variable_tee.c
+F: include/mm_communication.h
+
ENVIRONMENT
M: Joe Hershberger <joe.hershberger@ni.com>
R: Wolfgang Denk <wd@denx.de>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index b3f5c2f..2cf3f4b 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -1529,9 +1529,8 @@
void efi_add_known_memory(void)
{
int i;
- phys_addr_t ram_start, start;
+ phys_addr_t ram_start;
phys_size_t ram_size;
- u64 pages;
/* Add RAM */
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
@@ -1549,11 +1548,8 @@
gd->arch.resv_ram < ram_start + ram_size)
ram_size = gd->arch.resv_ram - ram_start;
#endif
- start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
- pages = (ram_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
-
- efi_add_memory_map(start, pages, EFI_CONVENTIONAL_MEMORY,
- false);
+ efi_add_memory_map(ram_start, ram_size,
+ EFI_CONVENTIONAL_MEMORY);
}
}
#endif
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
index 3bbad82..0696ea6 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
@@ -146,9 +146,8 @@
fdt_add_mem_rsv(blob, (uintptr_t)&secondary_boot_code,
*boot_code_size);
#if CONFIG_IS_ENABLED(EFI_LOADER)
- efi_add_memory_map((uintptr_t)&secondary_boot_code,
- ALIGN(*boot_code_size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT,
- EFI_RESERVED_MEMORY_TYPE, false);
+ efi_add_memory_map((uintptr_t)&secondary_boot_code, *boot_code_size,
+ EFI_RESERVED_MEMORY_TYPE);
#endif
}
#endif
diff --git a/arch/arm/dts/fsl-lx2160a.dtsi b/arch/arm/dts/fsl-lx2160a.dtsi
index 17ecdc5..73d04db 100644
--- a/arch/arm/dts/fsl-lx2160a.dtsi
+++ b/arch/arm/dts/fsl-lx2160a.dtsi
@@ -428,4 +428,10 @@
#size-cells = <0>;
status = "disabled";
};
+ firmware {
+ optee {
+ compatible = "linaro,optee-tz";
+ method = "smc";
+ };
+ };
};
diff --git a/arch/arm/mach-meson/board-common.c b/arch/arm/mach-meson/board-common.c
index bc4c920..747791b 100644
--- a/arch/arm/mach-meson/board-common.c
+++ b/arch/arm/mach-meson/board-common.c
@@ -69,11 +69,8 @@
if (ret)
printf("Could not reserve zone @ 0x%llx\n", start);
- if (IS_ENABLED(CONFIG_EFI_LOADER)) {
- efi_add_memory_map(start,
- ALIGN(size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT,
- EFI_RESERVED_MEMORY_TYPE, false);
- }
+ if (IS_ENABLED(CONFIG_EFI_LOADER))
+ efi_add_memory_map(start, size, EFI_RESERVED_MEMORY_TYPE);
}
int meson_generate_serial_ethaddr(void)
diff --git a/arch/x86/lib/e820.c b/arch/x86/lib/e820.c
index 26da4d2..1f20c5c 100644
--- a/arch/x86/lib/e820.c
+++ b/arch/x86/lib/e820.c
@@ -41,7 +41,7 @@
{
struct e820_entry e820[E820MAX];
unsigned int i, num;
- u64 start, pages, ram_top;
+ u64 start, ram_top;
int type;
num = install_e820_map(ARRAY_SIZE(e820), e820);
@@ -77,9 +77,7 @@
start + e820[i].size,
ram_top);
} else {
- pages = ALIGN(e820[i].size, EFI_PAGE_SIZE)
- >> EFI_PAGE_SHIFT;
- efi_add_memory_map(start, pages, type, false);
+ efi_add_memory_map(start, e820[i].size, type);
}
}
}
diff --git a/board/freescale/lx2160a/MAINTAINERS b/board/freescale/lx2160a/MAINTAINERS
index 47ae04c..9fe79c0 100644
--- a/board/freescale/lx2160a/MAINTAINERS
+++ b/board/freescale/lx2160a/MAINTAINERS
@@ -5,6 +5,7 @@
F: include/configs/lx2160a_common.h
F: include/configs/lx2160ardb.h
F: configs/lx2160ardb_tfa_defconfig
+F: configs/lx2160ardb_tfa_stmm_defconfig
F: arch/arm/dts/fsl-lx2160a-rdb.dts
LX2160ARDB_SECURE_BOOT BOARD
diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index 0206a09..45caa4d 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -489,8 +489,8 @@
#ifdef CONFIG_EFI_LOADER
/* Reserve the spin table */
- efi_add_memory_map(0, CONFIG_RPI_EFI_NR_SPIN_PAGES,
- EFI_RESERVED_MEMORY_TYPE, 0);
+ efi_add_memory_map(0, CONFIG_RPI_EFI_NR_SPIN_PAGES << EFI_PAGE_SHIFT,
+ EFI_RESERVED_MEMORY_TYPE);
#endif
return 0;
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 06573b1..9849eb4 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -151,14 +151,10 @@
static void efi_reserve_memory(u64 addr, u64 size)
{
- u64 pages;
-
/* Convert from sandbox address space. */
addr = (uintptr_t)map_sysmem(addr, 0);
- pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
- addr &= ~EFI_PAGE_MASK;
- if (efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
- false) != EFI_SUCCESS)
+ if (efi_add_memory_map(addr, size,
+ EFI_RESERVED_MEMORY_TYPE) != EFI_SUCCESS)
printf("Reserved memory mapping failed addr %llx size %llx\n",
addr, size);
}
diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index 5cc0a41..f020d95 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -1165,6 +1165,58 @@
return cp->cmd(cmdtp, flag, argc, argv);
}
+/**
+ * do_efi_query_info() - QueryVariableInfo EFI service
+ *
+ * @cmdtp: Command table
+ * @flag: Command flag
+ * @argc: Number of arguments
+ * @argv: Argument array
+ * Return: CMD_RET_SUCCESS on success,
+ * CMD_RET_USAGE or CMD_RET_FAILURE on failure
+ *
+ * Implement efidebug "test" sub-command.
+ */
+
+static int do_efi_query_info(cmd_tbl_t *cmdtp, int flag,
+ int argc, char * const argv[])
+{
+ efi_status_t ret;
+ u32 attr = 0;
+ u64 max_variable_storage_size;
+ u64 remain_variable_storage_size;
+ u64 max_variable_size;
+ int i;
+
+ for (i = 1; i < argc; i++) {
+ if (!strcmp(argv[i], "-bs"))
+ attr |= EFI_VARIABLE_BOOTSERVICE_ACCESS;
+ else if (!strcmp(argv[i], "-rt"))
+ attr |= EFI_VARIABLE_RUNTIME_ACCESS;
+ else if (!strcmp(argv[i], "-nv"))
+ attr |= EFI_VARIABLE_NON_VOLATILE;
+ else if (!strcmp(argv[i], "-at"))
+ attr |=
+ EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
+ }
+
+ ret = EFI_CALL(efi_query_variable_info(attr,
+ &max_variable_storage_size,
+ &remain_variable_storage_size,
+ &max_variable_size));
+ if (ret != EFI_SUCCESS) {
+ printf("Error: Cannot query UEFI variables, r = %lu\n",
+ ret & ~EFI_ERROR_MASK);
+ return CMD_RET_FAILURE;
+ }
+
+ printf("Max storage size %llu\n", max_variable_storage_size);
+ printf("Remaining storage size %llu\n", remain_variable_storage_size);
+ printf("Max variable size %llu\n", max_variable_size);
+
+ return CMD_RET_SUCCESS;
+}
+
static cmd_tbl_t cmd_efidebug_sub[] = {
U_BOOT_CMD_MKENT(boot, CONFIG_SYS_MAXARGS, 1, do_efi_boot_opt, "", ""),
U_BOOT_CMD_MKENT(devices, CONFIG_SYS_MAXARGS, 1, do_efi_show_devices,
@@ -1181,6 +1233,8 @@
"", ""),
U_BOOT_CMD_MKENT(test, CONFIG_SYS_MAXARGS, 1, do_efi_test,
"", ""),
+ U_BOOT_CMD_MKENT(query, CONFIG_SYS_MAXARGS, 1, do_efi_query_info,
+ "", ""),
};
/**
@@ -1252,7 +1306,9 @@
"efidebug tables\n"
" - show UEFI configuration tables\n"
"efidebug test bootmgr\n"
- " - run simple bootmgr for test\n";
+ " - run simple bootmgr for test\n"
+ "efidebug query [-nv][-bs][-rt][-at]\n"
+ " - show size of UEFI variables store\n";
#endif
U_BOOT_CMD(
diff --git a/configs/lx2160ardb_tfa_stmm_defconfig b/configs/lx2160ardb_tfa_stmm_defconfig
new file mode 100644
index 0000000..5f181a3
--- /dev/null
+++ b/configs/lx2160ardb_tfa_stmm_defconfig
@@ -0,0 +1,85 @@
+CONFIG_ARM=y
+CONFIG_GIC_V3_ITS=y
+CONFIG_TARGET_LX2160ARDB=y
+CONFIG_TFABOOT=y
+CONFIG_SYS_TEXT_BASE=0x82000000
+CONFIG_SYS_MALLOC_F_LEN=0x6000
+CONFIG_ENV_SIZE=0x2000
+CONFIG_ENV_OFFSET=0x500000
+CONFIG_ENV_SECT_SIZE=0x20000
+CONFIG_DM_GPIO=y
+CONFIG_EMC2305=y
+CONFIG_FSPI_AHB_EN_4BYTE=y
+CONFIG_NR_DRAM_BANKS=3
+CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT=y
+CONFIG_SEC_FIRMWARE_ARMV8_PSCI=y
+CONFIG_AHCI=y
+CONFIG_FIT_VERBOSE=y
+CONFIG_OF_BOARD_SETUP=y
+CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_BOOTDELAY=10
+CONFIG_USE_BOOTARGS=y
+CONFIG_BOOTARGS="console=ttyAMA0,115200 root=/dev/ram0 earlycon=pl011,mmio32,0x21c0000 ramdisk_size=0x2000000 default_hugepagesz=1024m hugepagesz=1024m hugepages=2 pci=pcie_bus_perf"
+# CONFIG_USE_BOOTCOMMAND is not set
+CONFIG_MISC_INIT_R=y
+CONFIG_CMD_GREPENV=y
+CONFIG_CMD_NVEDIT_EFI=y
+CONFIG_CMD_EEPROM=y
+CONFIG_CMD_DM=y
+CONFIG_CMD_GPT=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_PCI=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_EFIDEBUG=y
+CONFIG_MP=y
+CONFIG_OF_CONTROL=y
+CONFIG_OF_BOARD_FIXUP=y
+CONFIG_DEFAULT_DEVICE_TREE="fsl-lx2160a-rdb"
+CONFIG_ENV_IS_IN_MMC=y
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_ENV_ADDR=0x20500000
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_DM=y
+CONFIG_SATA_CEVA=y
+CONFIG_FSL_CAAM=y
+CONFIG_DM_I2C=y
+CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
+CONFIG_I2C_DEFAULT_BUS_NUMBER=0
+CONFIG_DM_MMC=y
+CONFIG_SUPPORT_EMMC_RPMB=y
+CONFIG_FSL_ESDHC=y
+CONFIG_MTD=y
+CONFIG_DM_SPI_FLASH=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+# CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
+CONFIG_PHYLIB=y
+CONFIG_PHY_AQUANTIA=y
+CONFIG_PHY_ATHEROS=y
+CONFIG_PHY_CORTINA=y
+CONFIG_DM_ETH=y
+CONFIG_DM_MDIO=y
+CONFIG_E1000=y
+CONFIG_FSL_LS_MDIO=y
+CONFIG_PCI=y
+CONFIG_DM_PCI=y
+CONFIG_DM_PCI_COMPAT=y
+CONFIG_PCIE_LAYERSCAPE=y
+CONFIG_PCIE_LAYERSCAPE_GEN4=y
+CONFIG_DM_RTC=y
+CONFIG_RTC_PCF2127=y
+CONFIG_DM_SCSI=y
+CONFIG_DM_SERIAL=y
+CONFIG_SPI=y
+CONFIG_DM_SPI=y
+CONFIG_NXP_FSPI=y
+CONFIG_TEE=y
+CONFIG_OPTEE=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_XHCI_DWC3=y
+CONFIG_EFI_LOADER_BOUNCE_BUFFER=y
+CONFIG_EFI_MM_COMM_TEE=y
diff --git a/doc/uefi/uefi.rst b/doc/uefi/uefi.rst
index 4fda00d..03d6fd0 100644
--- a/doc/uefi/uefi.rst
+++ b/doc/uefi/uefi.rst
@@ -188,6 +188,23 @@
cd <U-Boot source directory>
pytest.py test/py/tests/test_efi_secboot/test_signed.py --bd sandbox
+Using OP-TEE for EFI variables
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Instead of implementing UEFI variable services inside U-Boot they can
+also be provided in the secure world by a module for OP-TEE[1]. The
+interface between U-Boot and OP-TEE for variable services is enabled by
+CONFIG_EFI_MM_COMM_TEE=y.
+
+Tianocore EDK II's standalone management mode driver for variables can
+be linked to OP-TEE for this purpose. This module uses the Replay
+Protected Memory Block (RPMB) of an eMMC device for persisting
+non-volatile variables. When calling the variable services via the
+OP-TEE API U-Boot's OP-TEE supplicant relays calls to the RPMB driver
+which has to be enabled via CONFIG_SUPPORT_EMMC_RPMB=y.
+
+[1] https://optee.readthedocs.io/ - OP-TEE documentation
+
Executing the boot manager
~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/drivers/video/meson/meson_vpu.c b/drivers/video/meson/meson_vpu.c
index aa8c0a9..ed47192 100644
--- a/drivers/video/meson/meson_vpu.c
+++ b/drivers/video/meson/meson_vpu.c
@@ -195,8 +195,8 @@
return;
#if defined(CONFIG_EFI_LOADER)
- efi_add_memory_map(meson_fb.base, meson_fb.fb_size >> EFI_PAGE_SHIFT,
- EFI_RESERVED_MEMORY_TYPE, false);
+ efi_add_memory_map(meson_fb.base, meson_fb.fb_size,
+ EFI_RESERVED_MEMORY_TYPE);
#endif
#if defined(CONFIG_VIDEO_DT_SIMPLEFB)
meson_vpu_setup_simplefb(fdt);
diff --git a/drivers/video/sunxi/sunxi_de2.c b/drivers/video/sunxi/sunxi_de2.c
index 8333ddc..c6e7a35 100644
--- a/drivers/video/sunxi/sunxi_de2.c
+++ b/drivers/video/sunxi/sunxi_de2.c
@@ -224,9 +224,9 @@
#ifdef CONFIG_EFI_LOADER
efi_add_memory_map(fbbase,
- ALIGN(timing.hactive.typ * timing.vactive.typ *
- (1 << l2bpp) / 8, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT,
- EFI_RESERVED_MEMORY_TYPE, false);
+ timing.hactive.typ * timing.vactive.typ *
+ (1 << l2bpp) / 8,
+ EFI_RESERVED_MEMORY_TYPE);
#endif
return 0;
diff --git a/drivers/video/sunxi/sunxi_display.c b/drivers/video/sunxi/sunxi_display.c
index 40ee009..c4c1d1b 100644
--- a/drivers/video/sunxi/sunxi_display.c
+++ b/drivers/video/sunxi/sunxi_display.c
@@ -1196,10 +1196,8 @@
sunxi_engines_init();
#ifdef CONFIG_EFI_LOADER
- efi_add_memory_map(gd->fb_base,
- ALIGN(sunxi_display.fb_size, EFI_PAGE_SIZE) >>
- EFI_PAGE_SHIFT,
- EFI_RESERVED_MEMORY_TYPE, false);
+ efi_add_memory_map(gd->fb_base, sunxi_display.fb_size,
+ EFI_RESERVED_MEMORY_TYPE);
#endif
fb_dma_addr = gd->fb_base - CONFIG_SYS_SDRAM_BASE;
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 0e924ad..75c20e4 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -545,8 +545,7 @@
efi_uintn_t *descriptor_size,
uint32_t *descriptor_version);
/* Adds a range into the EFI memory map */
-efi_status_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
- bool overlap_only_ram);
+efi_status_t efi_add_memory_map(u64 start, u64 size, int memory_type);
/* Adds a conventional range into the EFI memory map */
efi_status_t efi_add_conventional_memory_map(u64 ram_start, u64 ram_end,
u64 ram_top);
diff --git a/include/mm_communication.h b/include/mm_communication.h
new file mode 100644
index 0000000..193c4d1
--- /dev/null
+++ b/include/mm_communication.h
@@ -0,0 +1,208 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Headers for EFI variable service via StandAloneMM, EDK2 application running
+ * in OP-TEE
+ *
+ * Copyright (c) 2017, Intel Corporation. All rights reserved.
+ * Copyright (C) 2020 Linaro Ltd. <sughosh.ganu@linaro.org>
+ * Copyright (C) 2020 Linaro Ltd. <ilias.apalodimas@linaro.org>
+ */
+
+#ifndef _MM_COMMUNICATION_H_
+#define _MM_COMMUNICATION_H_
+
+#include <part_efi.h>
+
+/*
+ * Interface to the pseudo Trusted Application (TA), which provides a
+ * communication channel with the Standalone MM (Management Mode)
+ * Secure Partition running at Secure-EL0
+ */
+
+#define PTA_STMM_CMDID_COMMUNICATE 0
+
+/* OP-TEE is using big endian GUIDs while UEFI uses little endian ones */
+#define PTA_STMM_UUID { 0xed32d533, 0x99e6, 0x4209, {\
+ 0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7 } }
+
+#define EFI_MM_VARIABLE_GUID \
+ EFI_GUID(0xed32d533, 0x99e6, 0x4209, \
+ 0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7)
+
+/* Defined in EDK2 MdePkg/Include/Protocol/MmCommunication.h */
+
+/**
+ * struct efi_mm_communicate_header - Header used for SMM variable communication
+
+ * @header_guid: header use for disambiguation of content
+ * @message_len: length of the message. Does not include the size of the
+ * header
+ * @data: payload of the message
+ *
+ * Defined in EDK2 as EFI_MM_COMMUNICATE_HEADER.
+ * To avoid confusion in interpreting frames, the communication buffer should
+ * always begin with efi_mm_communicate_header.
+ */
+struct efi_mm_communicate_header {
+ efi_guid_t header_guid;
+ size_t message_len;
+ u8 data[];
+};
+
+#define MM_COMMUNICATE_HEADER_SIZE \
+ (sizeof(struct efi_mm_communicate_header))
+
+/* Defined in EDK2 ArmPkg/Include/IndustryStandard/ArmStdSmc.h */
+
+/* MM return error codes */
+#define ARM_SMC_MM_RET_SUCCESS 0
+#define ARM_SMC_MM_RET_NOT_SUPPORTED -1
+#define ARM_SMC_MM_RET_INVALID_PARAMS -2
+#define ARM_SMC_MM_RET_DENIED -3
+#define ARM_SMC_MM_RET_NO_MEMORY -4
+
+/* Defined in EDK2 MdeModulePkg/Include/Guid/SmmVariableCommon.h */
+
+#define SMM_VARIABLE_FUNCTION_GET_VARIABLE 1
+/*
+ * The payload for this function is
+ * SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME.
+ */
+#define SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME 2
+/*
+ * The payload for this function is SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE.
+ */
+#define SMM_VARIABLE_FUNCTION_SET_VARIABLE 3
+/*
+ * The payload for this function is
+ * SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO.
+ */
+#define SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO 4
+/*
+ * It is a notify event, no extra payload for this function.
+ */
+#define SMM_VARIABLE_FUNCTION_READY_TO_BOOT 5
+/*
+ * It is a notify event, no extra payload for this function.
+ */
+#define SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE 6
+/*
+ * The payload for this function is VARIABLE_INFO_ENTRY.
+ * The GUID in EFI_SMM_COMMUNICATE_HEADER is gEfiSmmVariableProtocolGuid.
+ */
+#define SMM_VARIABLE_FUNCTION_GET_STATISTICS 7
+/*
+ * The payload for this function is SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE
+ */
+#define SMM_VARIABLE_FUNCTION_LOCK_VARIABLE 8
+
+#define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_SET 9
+
+#define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_GET 10
+
+#define SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE 11
+/*
+ * The payload for this function is
+ * SMM_VARIABLE_COMMUNICATE_RUNTIME_VARIABLE_CACHE_CONTEXT
+ */
+#define SMM_VARIABLE_FUNCTION_INIT_RUNTIME_VARIABLE_CACHE_CONTEXT 12
+
+#define SMM_VARIABLE_FUNCTION_SYNC_RUNTIME_CACHE 13
+/*
+ * The payload for this function is
+ * SMM_VARIABLE_COMMUNICATE_GET_RUNTIME_CACHE_INFO
+ */
+#define SMM_VARIABLE_FUNCTION_GET_RUNTIME_CACHE_INFO 14
+
+/**
+ * struct smm_variable_communicate_header - Used for SMM variable communication
+
+ * @function: function to call in Smm.
+ * @ret_status: return status
+ * @data: payload
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_HEADER.
+ */
+struct smm_variable_communicate_header {
+ efi_uintn_t function;
+ efi_status_t ret_status;
+ u8 data[];
+};
+
+#define MM_VARIABLE_COMMUNICATE_SIZE \
+ (sizeof(struct smm_variable_communicate_header))
+
+/**
+ * struct smm_variable_access - Used to communicate with StMM by
+ * SetVariable and GetVariable.
+
+ * @guid: vendor GUID
+ * @data_size: size of EFI variable data
+ * @name_size: size of EFI name
+ * @attr: attributes
+ * @name: variable name
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE.
+ *
+ */
+struct smm_variable_access {
+ efi_guid_t guid;
+ efi_uintn_t data_size;
+ efi_uintn_t name_size;
+ u32 attr;
+ u16 name[];
+};
+
+#define MM_VARIABLE_ACCESS_HEADER_SIZE \
+ (sizeof(struct smm_variable_access))
+/**
+ * struct smm_variable_payload_size - Used to get the max allowed
+ * payload used in StMM.
+ *
+ * @size: size to fill in
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_GET_PAYLOAD_SIZE.
+ *
+ */
+struct smm_variable_payload_size {
+ efi_uintn_t size;
+};
+
+/**
+ * struct smm_variable_getnext - Used to communicate with StMM for
+ * GetNextVariableName.
+ *
+ * @guid: vendor GUID
+ * @name_size: size of the name of the variable
+ * @name: variable name
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME.
+ */
+struct smm_variable_getnext {
+ efi_guid_t guid;
+ efi_uintn_t name_size;
+ u16 name[];
+};
+
+#define MM_VARIABLE_GET_NEXT_HEADER_SIZE \
+ (sizeof(struct smm_variable_getnext))
+
+/**
+ * struct smm_variable_query_info - Used to communicate with StMM for
+ * QueryVariableInfo.
+ *
+ * @max_variable_storage: max available storage
+ * @remaining_variable_storage: remaining available storage
+ * @max_variable_size: max variable supported size
+ * @attr: attributes to query storage for
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO.
+ */
+struct smm_variable_query_info {
+ u64 max_variable_storage;
+ u64 remaining_variable_storage;
+ u64 max_variable_size;
+ u32 attr;
+};
+
+#endif /* _MM_COMMUNICATION_H_ */
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 1cfa24f..aad37b7 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -164,4 +164,13 @@
it is signed with a trusted key. To do that, you need to install,
at least, PK, KEK and db.
+config EFI_MM_COMM_TEE
+ bool "UEFI variables storage service via OP-TEE"
+ depends on OPTEE
+ default n
+ help
+ If OP-TEE is present and running StandAloneMM, dispatch all UEFI variable
+ related operations to that. The application will verify, authenticate and
+ store the variables on an RPMB.
+
endif
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 84d61df..57c7e66 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -35,7 +35,11 @@
obj-y += efi_runtime.o
obj-y += efi_setup.o
obj-$(CONFIG_EFI_UNICODE_COLLATION_PROTOCOL2) += efi_unicode_collation.o
+ifeq ($(CONFIG_EFI_MM_COMM_TEE),y)
+obj-y += efi_variable_tee.o
+else
obj-y += efi_variable.o
+endif
obj-y += efi_watchdog.o
obj-$(CONFIG_LCD) += efi_gop.o
obj-$(CONFIG_DM_VIDEO) += efi_gop.o
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index 97d90f0..c0cf1d9 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -229,7 +229,7 @@
}
/**
- * efi_add_memory_map() - add memory area to the memory map
+ * efi_add_memory_map_pg() - add pages to the memory map
*
* @start: start address, must be a multiple of EFI_PAGE_SIZE
* @pages: number of pages to add
@@ -237,8 +237,9 @@
* @overlap_only_ram: the memory area must overlap existing
* Return: status code
*/
-efi_status_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
- bool overlap_only_ram)
+static efi_status_t efi_add_memory_map_pg(u64 start, u64 pages,
+ int memory_type,
+ bool overlap_only_ram)
{
struct list_head *lhandle;
struct efi_mem_list *newlist;
@@ -344,6 +345,28 @@
}
/**
+ * efi_add_memory_map() - add memory area to the memory map
+ *
+ * @start: start address of the memory area
+ * @size: length in bytes of the memory area
+ * @memory_type: type of memory added
+ *
+ * Return: status code
+ *
+ * This function automatically aligns the start and size of the memory area
+ * to EFI_PAGE_SIZE.
+ */
+efi_status_t efi_add_memory_map(u64 start, u64 size, int memory_type)
+{
+ u64 pages;
+
+ pages = efi_size_in_pages(size + (start & EFI_PAGE_MASK));
+ start &= ~EFI_PAGE_MASK;
+
+ return efi_add_memory_map_pg(start, pages, memory_type, false);
+}
+
+/**
* efi_check_allocated() - validate address to be freed
*
* Check that the address is within allocated memory:
@@ -469,7 +492,8 @@
}
/* Reserve that map in our memory maps */
- if (efi_add_memory_map(addr, pages, memory_type, true) != EFI_SUCCESS)
+ ret = efi_add_memory_map_pg(addr, pages, memory_type, true);
+ if (ret != EFI_SUCCESS)
/* Map would overlap, bail out */
return EFI_OUT_OF_RESOURCES;
@@ -514,7 +538,8 @@
return EFI_INVALID_PARAMETER;
}
- ret = efi_add_memory_map(memory, pages, EFI_CONVENTIONAL_MEMORY, false);
+ ret = efi_add_memory_map_pg(memory, pages, EFI_CONVENTIONAL_MEMORY,
+ false);
/* Merging of adjacent free regions is missing */
if (ret != EFI_SUCCESS)
@@ -680,8 +705,8 @@
pages = (ram_end - ram_start) >> EFI_PAGE_SHIFT;
- efi_add_memory_map(ram_start, pages,
- EFI_CONVENTIONAL_MEMORY, false);
+ efi_add_memory_map_pg(ram_start, pages,
+ EFI_CONVENTIONAL_MEMORY, false);
/*
* Boards may indicate to the U-Boot memory core that they
@@ -691,14 +716,14 @@
*/
if (ram_top < ram_start) {
/* ram_top is before this region, reserve all */
- efi_add_memory_map(ram_start, pages,
- EFI_BOOT_SERVICES_DATA, true);
+ efi_add_memory_map_pg(ram_start, pages,
+ EFI_BOOT_SERVICES_DATA, true);
} else if ((ram_top >= ram_start) && (ram_top < ram_end)) {
/* ram_top is inside this region, reserve parts */
pages = (ram_end - ram_top) >> EFI_PAGE_SHIFT;
- efi_add_memory_map(ram_top, pages,
- EFI_BOOT_SERVICES_DATA, true);
+ efi_add_memory_map_pg(ram_top, pages,
+ EFI_BOOT_SERVICES_DATA, true);
}
return EFI_SUCCESS;
@@ -743,7 +768,8 @@
uboot_stack_size) & ~EFI_PAGE_MASK;
uboot_pages = ((uintptr_t)map_sysmem(gd->ram_top - 1, 0) -
uboot_start + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
- efi_add_memory_map(uboot_start, uboot_pages, EFI_LOADER_DATA, false);
+ efi_add_memory_map_pg(uboot_start, uboot_pages, EFI_LOADER_DATA,
+ false);
#if defined(__aarch64__)
/*
@@ -762,8 +788,8 @@
runtime_end = (ulong)&__efi_runtime_stop;
runtime_end = (runtime_end + runtime_mask) & ~runtime_mask;
runtime_pages = (runtime_end - runtime_start) >> EFI_PAGE_SHIFT;
- efi_add_memory_map(runtime_start, runtime_pages,
- EFI_RUNTIME_SERVICES_CODE, false);
+ efi_add_memory_map_pg(runtime_start, runtime_pages,
+ EFI_RUNTIME_SERVICES_CODE, false);
}
int efi_memory_init(void)
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 6a25acb..a28b291 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -784,11 +784,10 @@
efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
{
struct efi_runtime_mmio_list *newmmio;
- u64 pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
uint64_t addr = *(uintptr_t *)mmio_ptr;
efi_status_t ret;
- ret = efi_add_memory_map(addr, pages, EFI_MMAP_IO, false);
+ ret = efi_add_memory_map(addr, len, EFI_MMAP_IO);
if (ret != EFI_SUCCESS)
return EFI_OUT_OF_RESOURCES;
diff --git a/lib/efi_loader/efi_variable_tee.c b/lib/efi_loader/efi_variable_tee.c
new file mode 100644
index 0000000..cacc76e
--- /dev/null
+++ b/lib/efi_loader/efi_variable_tee.c
@@ -0,0 +1,662 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * EFI variable service via OP-TEE
+ *
+ * Copyright (C) 2019 Linaro Ltd. <sughosh.ganu@linaro.org>
+ * Copyright (C) 2019 Linaro Ltd. <ilias.apalodimas@linaro.org>
+ */
+
+#include <common.h>
+#include <efi.h>
+#include <efi_api.h>
+#include <efi_loader.h>
+#include <tee.h>
+#include <malloc.h>
+#include <mm_communication.h>
+
+static efi_uintn_t max_buffer_size; /* comm + var + func + data */
+static efi_uintn_t max_payload_size; /* func + data */
+
+struct mm_connection {
+ struct udevice *tee;
+ u32 session;
+};
+
+/**
+ * get_connection() - Retrieve OP-TEE session for a specific UUID.
+ *
+ * @conn: session buffer to fill
+ * Return: status code
+ */
+static int get_connection(struct mm_connection *conn)
+{
+ static const struct tee_optee_ta_uuid uuid = PTA_STMM_UUID;
+ struct udevice *tee = NULL;
+ struct tee_open_session_arg arg;
+ int rc;
+
+ tee = tee_find_device(tee, NULL, NULL, NULL);
+ if (!tee)
+ return -ENODEV;
+
+ memset(&arg, 0, sizeof(arg));
+ tee_optee_ta_uuid_to_octets(arg.uuid, &uuid);
+ rc = tee_open_session(tee, &arg, 0, NULL);
+ if (!rc) {
+ conn->tee = tee;
+ conn->session = arg.session;
+ }
+
+ return rc;
+}
+
+/**
+ * optee_mm_communicate() - Pass a buffer to StandaloneMM running in OP-TEE
+ *
+ * @comm_buf: locally allocted communcation buffer
+ * @dsize: buffer size
+ * Return: status code
+ */
+static efi_status_t optee_mm_communicate(void *comm_buf, ulong dsize)
+{
+ ulong buf_size;
+ efi_status_t ret;
+ struct efi_mm_communicate_header *mm_hdr;
+ struct mm_connection conn = { NULL, 0 };
+ struct tee_invoke_arg arg;
+ struct tee_param param[2];
+ struct tee_shm *shm = NULL;
+ int rc;
+
+ if (!comm_buf)
+ return EFI_INVALID_PARAMETER;
+
+ mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
+ buf_size = mm_hdr->message_len + sizeof(efi_guid_t) + sizeof(size_t);
+
+ if (dsize != buf_size)
+ return EFI_INVALID_PARAMETER;
+
+ rc = get_connection(&conn);
+ if (rc) {
+ log_err("Unable to open OP-TEE session (err=%d)\n", rc);
+ return EFI_UNSUPPORTED;
+ }
+
+ if (tee_shm_register(conn.tee, comm_buf, buf_size, 0, &shm)) {
+ log_err("Unable to register shared memory\n");
+ return EFI_UNSUPPORTED;
+ }
+
+ memset(&arg, 0, sizeof(arg));
+ arg.func = PTA_STMM_CMDID_COMMUNICATE;
+ arg.session = conn.session;
+
+ memset(param, 0, sizeof(param));
+ param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INOUT;
+ param[0].u.memref.size = buf_size;
+ param[0].u.memref.shm = shm;
+ param[1].attr = TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT;
+
+ rc = tee_invoke_func(conn.tee, &arg, 2, param);
+ if (rc)
+ return EFI_INVALID_PARAMETER;
+ tee_shm_free(shm);
+ tee_close_session(conn.tee, conn.session);
+
+ switch (param[1].u.value.a) {
+ case ARM_SMC_MM_RET_SUCCESS:
+ ret = EFI_SUCCESS;
+ break;
+
+ case ARM_SMC_MM_RET_INVALID_PARAMS:
+ ret = EFI_INVALID_PARAMETER;
+ break;
+
+ case ARM_SMC_MM_RET_DENIED:
+ ret = EFI_ACCESS_DENIED;
+ break;
+
+ case ARM_SMC_MM_RET_NO_MEMORY:
+ ret = EFI_OUT_OF_RESOURCES;
+ break;
+
+ default:
+ ret = EFI_ACCESS_DENIED;
+ }
+
+ return ret;
+}
+
+/**
+ * mm_communicate() - Adjust the cmonnucation buffer to StandAlonneMM and send
+ * it to OP-TEE
+ *
+ * @comm_buf: locally allocted communcation buffer
+ * @dsize: buffer size
+ * Return: status code
+ */
+static efi_status_t mm_communicate(u8 *comm_buf, efi_uintn_t dsize)
+{
+ efi_status_t ret;
+ struct efi_mm_communicate_header *mm_hdr;
+ struct smm_variable_communicate_header *var_hdr;
+
+ dsize += MM_COMMUNICATE_HEADER_SIZE + MM_VARIABLE_COMMUNICATE_SIZE;
+ mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
+ var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data;
+
+ ret = optee_mm_communicate(comm_buf, dsize);
+ if (ret != EFI_SUCCESS) {
+ log_err("%s failed!\n", __func__);
+ return ret;
+ }
+
+ return var_hdr->ret_status;
+}
+
+/**
+ * setup_mm_hdr() - Allocate a buffer for StandAloneMM and initialize the
+ * header data.
+ *
+ * @dptr: pointer address of the corresponding StandAloneMM
+ * function
+ * @payload_size: buffer size
+ * @func: standAloneMM function number
+ * @ret: EFI return code
+ * Return: buffer or NULL
+ */
+static u8 *setup_mm_hdr(void **dptr, efi_uintn_t payload_size,
+ efi_uintn_t func, efi_status_t *ret)
+{
+ const efi_guid_t mm_var_guid = EFI_MM_VARIABLE_GUID;
+ struct efi_mm_communicate_header *mm_hdr;
+ struct smm_variable_communicate_header *var_hdr;
+ u8 *comm_buf;
+
+ /* In the init function we initialize max_buffer_size with
+ * get_max_payload(). So skip the test if max_buffer_size is initialized
+ * StandAloneMM will perform similar checks and drop the buffer if it's
+ * too long
+ */
+ if (max_buffer_size && max_buffer_size <
+ (MM_COMMUNICATE_HEADER_SIZE +
+ MM_VARIABLE_COMMUNICATE_SIZE +
+ payload_size)) {
+ *ret = EFI_INVALID_PARAMETER;
+ return NULL;
+ }
+
+ comm_buf = calloc(1, MM_COMMUNICATE_HEADER_SIZE +
+ MM_VARIABLE_COMMUNICATE_SIZE +
+ payload_size);
+ if (!comm_buf) {
+ *ret = EFI_OUT_OF_RESOURCES;
+ return NULL;
+ }
+
+ mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
+ guidcpy(&mm_hdr->header_guid, &mm_var_guid);
+ mm_hdr->message_len = MM_VARIABLE_COMMUNICATE_SIZE + payload_size;
+
+ var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data;
+ var_hdr->function = func;
+ if (dptr)
+ *dptr = var_hdr->data;
+ *ret = EFI_SUCCESS;
+
+ return comm_buf;
+}
+
+/**
+ * get_max_payload() - Get variable payload size from StandAloneMM.
+ *
+ * @size: size of the variable in storage
+ * Return: status code
+ */
+efi_status_t EFIAPI get_max_payload(efi_uintn_t *size)
+{
+ struct smm_variable_payload_size *var_payload = NULL;
+ efi_uintn_t payload_size;
+ u8 *comm_buf = NULL;
+ efi_status_t ret;
+
+ if (!size) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ payload_size = sizeof(*var_payload);
+ comm_buf = setup_mm_hdr((void **)&var_payload, payload_size,
+ SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE, &ret);
+ if (!comm_buf)
+ goto out;
+
+ ret = mm_communicate(comm_buf, payload_size);
+ if (ret != EFI_SUCCESS)
+ goto out;
+
+ *size = var_payload->size;
+
+out:
+ free(comm_buf);
+ return ret;
+}
+
+/**
+ * efi_get_variable() - retrieve value of a UEFI variable
+ *
+ * This function implements the GetVariable 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 to which the variable value is copied
+ * @data: buffer to which the variable value is copied
+ * Return: status code
+ */
+efi_status_t EFIAPI efi_get_variable(u16 *name, const efi_guid_t *guid,
+ u32 *attr, efi_uintn_t *data_size,
+ void *data)
+{
+ struct smm_variable_access *var_acc;
+ efi_uintn_t payload_size;
+ efi_uintn_t name_size;
+ efi_uintn_t tmp_dsize;
+ u8 *comm_buf = NULL;
+ efi_status_t ret;
+
+ EFI_ENTRY("\"%ls\" %pUl %p %p %p", name, guid, attr, data_size, data);
+
+ if (!name || !guid || !data_size) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ /* Check payload size */
+ name_size = u16_strsize(name);
+ if (name_size > max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ /* Trim output buffer size */
+ tmp_dsize = *data_size;
+ if (name_size + tmp_dsize >
+ max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE) {
+ tmp_dsize = max_payload_size -
+ MM_VARIABLE_ACCESS_HEADER_SIZE -
+ name_size;
+ }
+
+ /* Get communication buffer and initialize header */
+ payload_size = MM_VARIABLE_ACCESS_HEADER_SIZE + name_size + tmp_dsize;
+ comm_buf = setup_mm_hdr((void **)&var_acc, payload_size,
+ SMM_VARIABLE_FUNCTION_GET_VARIABLE, &ret);
+ if (!comm_buf)
+ goto out;
+
+ /* Fill in contents */
+ guidcpy(&var_acc->guid, guid);
+ var_acc->data_size = tmp_dsize;
+ var_acc->name_size = name_size;
+ var_acc->attr = attr ? *attr : 0;
+ memcpy(var_acc->name, name, 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 */
+ *data_size = var_acc->data_size;
+ }
+ if (ret != EFI_SUCCESS)
+ goto out;
+
+ if (attr)
+ *attr = var_acc->attr;
+ if (data)
+ memcpy(data, (u8 *)var_acc->name + var_acc->name_size,
+ var_acc->data_size);
+ else
+ ret = EFI_INVALID_PARAMETER;
+
+out:
+ free(comm_buf);
+ return EFI_EXIT(ret);
+}
+
+/**
+ * efi_get_next_variable_name() - enumerate the current variable names
+ *
+ * @variable_name_size: size of variable_name buffer in bytes
+ * @variable_name: name of uefi variable's name in u16
+ * @guid: vendor's guid
+ *
+ * This function implements the GetNextVariableName service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * Return: status code
+ */
+efi_status_t EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
+ u16 *variable_name,
+ efi_guid_t *guid)
+{
+ struct smm_variable_getnext *var_getnext;
+ efi_uintn_t payload_size;
+ efi_uintn_t out_name_size;
+ efi_uintn_t in_name_size;
+ efi_uintn_t tmp_dsize;
+ efi_uintn_t name_size;
+ u8 *comm_buf = NULL;
+ efi_status_t ret;
+
+ EFI_ENTRY("%p \"%ls\" %pUl", variable_name_size, variable_name, guid);
+
+ if (!variable_name_size || !variable_name || !guid) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ out_name_size = *variable_name_size;
+ in_name_size = u16_strsize(variable_name);
+
+ if (out_name_size < in_name_size) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ name_size = u16_strsize(variable_name);
+ if (name_size > max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ /* Trim output buffer size */
+ tmp_dsize = *variable_name_size;
+ if (name_size + tmp_dsize >
+ max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE) {
+ tmp_dsize = max_payload_size -
+ MM_VARIABLE_GET_NEXT_HEADER_SIZE -
+ name_size;
+ }
+
+ payload_size = MM_VARIABLE_GET_NEXT_HEADER_SIZE + out_name_size;
+ comm_buf = setup_mm_hdr((void **)&var_getnext, payload_size,
+ SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME,
+ &ret);
+ if (!comm_buf)
+ goto out;
+
+ /* Fill in contents */
+ guidcpy(&var_getnext->guid, guid);
+ var_getnext->name_size = out_name_size;
+ memcpy(var_getnext->name, variable_name, in_name_size);
+ memset((u8 *)var_getnext->name + in_name_size, 0x0,
+ 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,
+ var_getnext->name_size);
+
+out:
+ free(comm_buf);
+ return EFI_EXIT(ret);
+}
+
+/**
+ * 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;
+}