From d9a1beaa10e88cdba6fb532d540007c0e2a83686 Mon Sep 17 00:00:00 2001 From: Alexandre Courbot Date: Sun, 24 Nov 2013 15:30:46 +0900 Subject: ARM: add basic support for Trusted Foundations Trusted Foundations is a TrustZone-based secure monitor for ARM that can be invoked using the same SMC-based API on supported platforms. This patch adds initial basic support for Trusted Foundations using the ARM firmware API. Current features are limited to the ability to boot secondary processors. Note: The API followed by Trusted Foundations does *not* follow the SMC calling conventions. It has nothing to do with PSCI neither and is only relevant to devices that use Trusted Foundations (like most Tegra-based retail devices). Signed-off-by: Alexandre Courbot Reviewed-by: Tomasz Figa Reviewed-by: Stephen Warren Signed-off-by: Stephen Warren --- arch/arm/firmware/trusted_foundations.c | 81 +++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 arch/arm/firmware/trusted_foundations.c (limited to 'arch/arm/firmware/trusted_foundations.c') diff --git a/arch/arm/firmware/trusted_foundations.c b/arch/arm/firmware/trusted_foundations.c new file mode 100644 index 000000000000..ef1e3d8f4af0 --- /dev/null +++ b/arch/arm/firmware/trusted_foundations.c @@ -0,0 +1,81 @@ +/* + * Trusted Foundations support for ARM CPUs + * + * Copyright (c) 2013, NVIDIA Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include +#include +#include +#include +#include + +#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200 + +static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2) +{ + asm volatile( + ".arch_extension sec\n\t" + "stmfd sp!, {r4 - r11, lr}\n\t" + __asmeq("%0", "r0") + __asmeq("%1", "r1") + __asmeq("%2", "r2") + "mov r3, #0\n\t" + "mov r4, #0\n\t" + "smc #0\n\t" + "ldmfd sp!, {r4 - r11, pc}" + : + : "r" (type), "r" (arg1), "r" (arg2) + : "memory"); +} + +static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr) +{ + tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, boot_addr, 0); + + return 0; +} + +static const struct firmware_ops trusted_foundations_ops = { + .set_cpu_boot_addr = tf_set_cpu_boot_addr, +}; + +void register_trusted_foundations(struct trusted_foundations_platform_data *pd) +{ + /* + * we are not using version information for now since currently + * supported SMCs are compatible with all TF releases + */ + register_firmware_ops(&trusted_foundations_ops); +} + +void of_register_trusted_foundations(void) +{ + struct device_node *node; + struct trusted_foundations_platform_data pdata; + int err; + + node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"); + if (!node) + return; + + err = of_property_read_u32(node, "tlm,version-major", + &pdata.version_major); + if (err != 0) + panic("Trusted Foundation: missing version-major property\n"); + err = of_property_read_u32(node, "tlm,version-minor", + &pdata.version_minor); + if (err != 0) + panic("Trusted Foundation: missing version-minor property\n"); + register_trusted_foundations(&pdata); +} -- cgit v1.2.3