diff options
| -rw-r--r-- | docs/user-guide.rst | 11 | ||||
| -rw-r--r-- | plat/arm/common/arm_bl31_setup.c | 17 | ||||
| -rw-r--r-- | plat/arm/common/arm_common.mk | 21 |
3 files changed, 46 insertions, 3 deletions
diff --git a/docs/user-guide.rst b/docs/user-guide.rst index aed54a63..4a8c3a15 100644 --- a/docs/user-guide.rst +++ b/docs/user-guide.rst @@ -590,7 +590,7 @@ Common build options firmware images have been loaded in memory, and the MMU and caches are turned off. Refer to the "Debugging options" section for more details. -- ``SP_MIN_WITH_SECURE_FIQ``: Boolean flag to indicate the SP_MIN handles +- ``SP_MIN_WITH_SECURE_FIQ``: Boolean flag to indicate the SP_MIN handles secure interrupts (caught through the FIQ line). Platforms can enable this directive if they need to handle such interruption. When enabled, the FIQ are handled in monitor mode and non secure world is not allowed @@ -678,6 +678,15 @@ Arm development platform specific build options Trusted Watchdog may be disabled at build time for testing or development purposes. +- ``ARM_LINUX_KERNEL_AS_BL33``: The Linux kernel expects registers x0-x3 to + have specific values at boot. This boolean option allows the Trusted Firmware + to have a Linux kernel image as BL33 by preparing the registers to these + values before jumping to BL33. This option defaults to 0 (disabled). For now, + it only supports AArch64 kernels. ``RESET_TO_BL31`` must be 1 when using it. + If this option is set to 1, ``ARM_PRELOADED_DTB_BASE`` must be set to the + location of a device tree blob (DTB) already loaded in memory. The Linux + Image address must be specified using the ``PRELOADED_BL33_BASE`` option. + - ``ARM_RECOM_STATE_ID_ENC``: The PSCI1.0 specification recommends an encoding for the construction of composite state-ID in the power-state parameter. The existing PSCI clients currently do not support this encoding of diff --git a/plat/arm/common/arm_bl31_setup.c b/plat/arm/common/arm_bl31_setup.c index 3c70f9de..ae0bf048 100644 --- a/plat/arm/common/arm_bl31_setup.c +++ b/plat/arm/common/arm_bl31_setup.c @@ -80,7 +80,7 @@ void arm_bl31_early_platform_setup(bl31_params_t *from_bl2, uintptr_t soc_fw_con assert(from_bl2 == NULL); assert(plat_params_from_bl2 == NULL); -#ifdef BL32_BASE +# ifdef BL32_BASE /* Populate entry point information for BL32 */ SET_PARAM_HEAD(&bl32_image_ep_info, PARAM_EP, @@ -89,7 +89,7 @@ void arm_bl31_early_platform_setup(bl31_params_t *from_bl2, uintptr_t soc_fw_con SET_SECURITY_STATE(bl32_image_ep_info.h.attr, SECURE); bl32_image_ep_info.pc = BL32_BASE; bl32_image_ep_info.spsr = arm_get_spsr_for_bl32_entry(); -#endif /* BL32_BASE */ +# endif /* BL32_BASE */ /* Populate entry point information for BL33 */ SET_PARAM_HEAD(&bl33_image_ep_info, @@ -105,6 +105,19 @@ void arm_bl31_early_platform_setup(bl31_params_t *from_bl2, uintptr_t soc_fw_con bl33_image_ep_info.spsr = arm_get_spsr_for_bl33_entry(); SET_SECURITY_STATE(bl33_image_ep_info.h.attr, NON_SECURE); +# if ARM_LINUX_KERNEL_AS_BL33 + /* + * According to the file ``Documentation/arm64/booting.txt`` of the + * Linux kernel tree, Linux expects the physical address of the device + * tree blob (DTB) in x0, while x1-x3 are reserved for future use and + * must be 0. + */ + bl33_image_ep_info.args.arg0 = (u_register_t)ARM_PRELOADED_DTB_BASE; + bl33_image_ep_info.args.arg1 = 0U; + bl33_image_ep_info.args.arg2 = 0U; + bl33_image_ep_info.args.arg3 = 0U; +# endif + #else /* RESET_TO_BL31 */ /* diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk index 015e454a..055819bf 100644 --- a/plat/arm/common/arm_common.mk +++ b/plat/arm/common/arm_common.mk @@ -80,6 +80,27 @@ ARM_XLAT_TABLES_LIB_V1 := 0 $(eval $(call assert_boolean,ARM_XLAT_TABLES_LIB_V1)) $(eval $(call add_define,ARM_XLAT_TABLES_LIB_V1)) +# Don't have the Linux kernel as a BL33 image by default +ARM_LINUX_KERNEL_AS_BL33 := 0 +$(eval $(call assert_boolean,ARM_LINUX_KERNEL_AS_BL33)) +$(eval $(call add_define,ARM_LINUX_KERNEL_AS_BL33)) + +ifeq (${ARM_LINUX_KERNEL_AS_BL33},1) + ifneq (${ARCH},aarch64) + $(error "ARM_LINUX_KERNEL_AS_BL33 is only available in AArch64.") + endif + ifneq (${RESET_TO_BL31},1) + $(error "ARM_LINUX_KERNEL_AS_BL33 is only available if RESET_TO_BL31=1.") + endif + ifndef PRELOADED_BL33_BASE + $(error "PRELOADED_BL33_BASE must be set if ARM_LINUX_KERNEL_AS_BL33 is used.") + endif + ifndef ARM_PRELOADED_DTB_BASE + $(error "ARM_PRELOADED_DTB_BASE must be set if ARM_LINUX_KERNEL_AS_BL33 is used.") + endif + $(eval $(call add_define,ARM_PRELOADED_DTB_BASE)) +endif + # Use an implementation of SHA-256 with a smaller memory footprint but reduced # speed. $(eval $(call add_define,MBEDTLS_SHA256_SMALLER)) |