From c8e829b7bf6e1c84af8b4b13ee7fce2959c63e0e Mon Sep 17 00:00:00 2001 From: Greg Bellows Date: Mon, 15 Dec 2014 17:09:47 -0600 Subject: target-arm: Add arm_boot_info secure_boot control Adds the secure_boot boolean field to the arm_boot_info descriptor. This fields is used to indicate whether Linux should boot into secure or non-secure state if the ARM EL3 feature is enabled. The default is to leave the CPU in an unaltered reset state. On EL3 enabled systems, the reset state is secure and can be overridden by setting the added field to false. Signed-off-by: Greg Bellows Reviewed-by: Peter Maydell Message-id: 1418684992-8996-11-git-send-email-greg.bellows@linaro.org Signed-off-by: Peter Maydell --- hw/arm/boot.c | 10 ++++++++++ include/hw/arm/arm.h | 4 ++++ 2 files changed, 14 insertions(+) diff --git a/hw/arm/boot.c b/hw/arm/boot.c index e6a3c5bcfb..c8d1d4e147 100644 --- a/hw/arm/boot.c +++ b/hw/arm/boot.c @@ -457,6 +457,16 @@ static void do_cpu_reset(void *opaque) env->thumb = info->entry & 1; } } else { + /* If we are booting Linux then we need to check whether we are + * booting into secure or non-secure state and adjust the state + * accordingly. Out of reset, ARM is defined to be in secure state + * (SCR.NS = 0), we change that here if non-secure boot has been + * requested. + */ + if (arm_feature(env, ARM_FEATURE_EL3) && !info->secure_boot) { + env->cp15.scr_el3 |= SCR_NS; + } + if (CPU(cpu) == first_cpu) { if (env->aarch64) { env->pc = info->loader_start; diff --git a/include/hw/arm/arm.h b/include/hw/arm/arm.h index cefc9e6988..e5a5d8c328 100644 --- a/include/hw/arm/arm.h +++ b/include/hw/arm/arm.h @@ -37,6 +37,10 @@ struct arm_boot_info { hwaddr gic_cpu_if_addr; int nb_cpus; int board_id; + /* ARM machines that support the ARM Security Extensions use this field to + * control whether Linux is booted as secure(true) or non-secure(false). + */ + bool secure_boot; int (*atag_board)(const struct arm_boot_info *info, void *p); /* multicore boards that use the default secondary core boot functions * can ignore these two function calls. If the default functions won't -- cgit v1.2.1