K3 devices have High Security (HS) variants along with the non-HS already supported. Like the previous generation devices (OMAP/Keystone2) K3 supports boot chain-of-trust by authenticating and optionally decrypting images as they are unpacked from FIT images. Add support for this here.
Signed-off-by: Andrew F. Davis afd@ti.com Reviewed-by: Tom Rini trini@konsulko.com Reviewed-by: Andreas Dannenberg dannenberg@ti.com --- MAINTAINERS | 1 + arch/arm/Kconfig | 2 +- arch/arm/mach-k3/Makefile | 1 + arch/arm/mach-k3/security.c | 63 +++++++++++++++++++++++++++++++++++++ 4 files changed, 66 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-k3/security.c
diff --git a/MAINTAINERS b/MAINTAINERS index f9ee4281d9..de1ea20930 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -721,6 +721,7 @@ S: Supported F: arch/arm/mach-omap2/omap5/sec_entry_cpu1.S F: arch/arm/mach-omap2/sec-common.c F: arch/arm/mach-omap2/config_secure.mk +F: arch/arm/mach-k3/security.c F: configs/am335x_hs_evm_defconfig F: configs/am335x_hs_evm_uart_defconfig F: configs/am43xx_hs_evm_defconfig diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 398dbef1cb..f89e590464 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1456,7 +1456,7 @@ endchoice
config TI_SECURE_DEVICE bool "HS Device Type Support" - depends on ARCH_KEYSTONE || ARCH_OMAP2PLUS + depends on ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3 help If a high secure (HS) device type is being used, this config must be set. This option impacts various aspects of the diff --git a/arch/arm/mach-k3/Makefile b/arch/arm/mach-k3/Makefile index bd4ab361b2..0c3a4f7db1 100644 --- a/arch/arm/mach-k3/Makefile +++ b/arch/arm/mach-k3/Makefile @@ -6,4 +6,5 @@ obj-$(CONFIG_SOC_K3_AM6) += am6_init.o obj-$(CONFIG_ARM64) += arm64-mmu.o obj-$(CONFIG_CPU_V7R) += r5_mpu.o lowlevel_init.o +obj-$(CONFIG_TI_SECURE_DEVICE) += security.o obj-y += common.o diff --git a/arch/arm/mach-k3/security.c b/arch/arm/mach-k3/security.c new file mode 100644 index 0000000000..52f49bf01f --- /dev/null +++ b/arch/arm/mach-k3/security.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * K3: Security functions + * + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + * Andrew F. Davis afd@ti.com + */ + +#include <common.h> +#include <dm.h> +#include <linux/soc/ti/ti_sci_protocol.h> +#include <mach/spl.h> +#include <spl.h> + +void board_fit_image_post_process(void **p_image, size_t *p_size) +{ + struct udevice *dev; + struct ti_sci_handle *ti_sci; + struct ti_sci_proc_ops *proc_ops; + u64 image_addr; + u32 image_size; + int ret; + + /* Get handle to Device Management and Security Controller (SYSFW) */ + ret = uclass_get_device_by_name(UCLASS_FIRMWARE, "dmsc", &dev); + if (ret) { + printf("Failed to get handle to SYSFW (%d)\n", ret); + hang(); + } + ti_sci = (struct ti_sci_handle *)(ti_sci_get_handle_from_sysfw(dev)); + proc_ops = &ti_sci->ops.proc_ops; + + image_addr = (uintptr_t)*p_image; + + debug("Authenticating image at address 0x%016llx\n", image_addr); + + /* Authenticate image */ + ret = proc_ops->proc_auth_boot_image(ti_sci, &image_addr, &image_size); + if (ret) { + printf("Authentication failed!\n"); + hang(); + } + + /* + * The image_size returned may be 0 when the authentication process has + * moved the image. When this happens no further processing on the + * image is needed or often even possible as it may have also been + * placed behind a firewall when moved. + */ + *p_size = image_size; + + /* + * Output notification of successful authentication to re-assure the + * user that the secure code is being processed as expected. However + * suppress any such log output in case of building for SPL and booting + * via YMODEM. This is done to avoid disturbing the YMODEM serial + * protocol transactions. + */ + if (!(IS_ENABLED(CONFIG_SPL_BUILD) && + IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) && + spl_boot_device() == BOOT_DEVICE_UART)) + printf("Authentication passed\n"); +}