plat/arm: Introduce ARM_LINUX_KERNEL_AS_BL33 build option
Normally, BL33 needs to contain a boot loader like U-Boot or UEFI that
eventually gives control to the OS. However, in some cases, this boot
sequence may be too slow. For example, when doing tests in a
cycle-accurate emulator, the user may only be interested in the
interaction between the Trusted Firmware and the OS, not in the boot
process itself.
The new option ARM_LINUX_KERNEL_AS_BL33 allows BL33 to contain the Linux
kernel image by changing the value of registers x0-x3 to the values
expected by the kernel. This option requires the device tree blob (DTB)
to be present in memory. Its address must be specified in the newly
introduced ARM_PRELOADED_DTB_BASE build option. For now, it only supports
AArch64 kernels.
This option is only available when RESET_TO_BL31=1. For this reason
the BL33 binary must be preloaded in memory and PRELOADED_BL33_BASE must
be used.
For example, if the kernel is loaded at 0x80080000 and the DTB is loaded
at address 0x82000000, the firmware could be built like this:
CROSS_COMPILE=aarch64-linux-gnu- \
make PLAT=fvp DEBUG=1 \
RESET_TO_BL31=1 \
ARM_LINUX_KERNEL_AS_BL33=1 \
PRELOADED_BL33_BASE=0x80080000 \
ARM_PRELOADED_DTB_BASE=0x82000000 \
all fip
Change-Id: If9dc847c65ae2d0c27b51f0fd44fc06b28497db9
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
This commit is contained in:
Antonio Nino Diaz
parent
885ca54a75
commit
b726c16907
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@ -590,7 +590,7 @@ Common build options
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firmware images have been loaded in memory, and the MMU and caches are
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turned off. Refer to the "Debugging options" section for more details.
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- ``SP_MIN_WITH_SECURE_FIQ``: Boolean flag to indicate the SP_MIN handles
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- ``SP_MIN_WITH_SECURE_FIQ``: Boolean flag to indicate the SP_MIN handles
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secure interrupts (caught through the FIQ line). Platforms can enable
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this directive if they need to handle such interruption. When enabled,
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the FIQ are handled in monitor mode and non secure world is not allowed
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@ -678,6 +678,15 @@ Arm development platform specific build options
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Trusted Watchdog may be disabled at build time for testing or development
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purposes.
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- ``ARM_LINUX_KERNEL_AS_BL33``: The Linux kernel expects registers x0-x3 to
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have specific values at boot. This boolean option allows the Trusted Firmware
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to have a Linux kernel image as BL33 by preparing the registers to these
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values before jumping to BL33. This option defaults to 0 (disabled). For now,
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it only supports AArch64 kernels. ``RESET_TO_BL31`` must be 1 when using it.
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If this option is set to 1, ``ARM_PRELOADED_DTB_BASE`` must be set to the
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location of a device tree blob (DTB) already loaded in memory. The Linux
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Image address must be specified using the ``PRELOADED_BL33_BASE`` option.
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- ``ARM_RECOM_STATE_ID_ENC``: The PSCI1.0 specification recommends an encoding
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for the construction of composite state-ID in the power-state parameter.
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The existing PSCI clients currently do not support this encoding of
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@ -80,7 +80,7 @@ void arm_bl31_early_platform_setup(bl31_params_t *from_bl2, uintptr_t soc_fw_con
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assert(from_bl2 == NULL);
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assert(plat_params_from_bl2 == NULL);
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#ifdef BL32_BASE
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# ifdef BL32_BASE
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/* Populate entry point information for BL32 */
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SET_PARAM_HEAD(&bl32_image_ep_info,
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PARAM_EP,
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@ -89,7 +89,7 @@ void arm_bl31_early_platform_setup(bl31_params_t *from_bl2, uintptr_t soc_fw_con
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SET_SECURITY_STATE(bl32_image_ep_info.h.attr, SECURE);
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bl32_image_ep_info.pc = BL32_BASE;
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bl32_image_ep_info.spsr = arm_get_spsr_for_bl32_entry();
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#endif /* BL32_BASE */
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# endif /* BL32_BASE */
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/* Populate entry point information for BL33 */
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SET_PARAM_HEAD(&bl33_image_ep_info,
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@ -105,6 +105,19 @@ void arm_bl31_early_platform_setup(bl31_params_t *from_bl2, uintptr_t soc_fw_con
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bl33_image_ep_info.spsr = arm_get_spsr_for_bl33_entry();
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SET_SECURITY_STATE(bl33_image_ep_info.h.attr, NON_SECURE);
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# if ARM_LINUX_KERNEL_AS_BL33
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/*
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* According to the file ``Documentation/arm64/booting.txt`` of the
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* Linux kernel tree, Linux expects the physical address of the device
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* tree blob (DTB) in x0, while x1-x3 are reserved for future use and
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* must be 0.
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*/
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bl33_image_ep_info.args.arg0 = (u_register_t)ARM_PRELOADED_DTB_BASE;
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bl33_image_ep_info.args.arg1 = 0U;
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bl33_image_ep_info.args.arg2 = 0U;
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bl33_image_ep_info.args.arg3 = 0U;
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# endif
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#else /* RESET_TO_BL31 */
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/*
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@ -80,6 +80,27 @@ ARM_XLAT_TABLES_LIB_V1 := 0
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$(eval $(call assert_boolean,ARM_XLAT_TABLES_LIB_V1))
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$(eval $(call add_define,ARM_XLAT_TABLES_LIB_V1))
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# Don't have the Linux kernel as a BL33 image by default
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ARM_LINUX_KERNEL_AS_BL33 := 0
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$(eval $(call assert_boolean,ARM_LINUX_KERNEL_AS_BL33))
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$(eval $(call add_define,ARM_LINUX_KERNEL_AS_BL33))
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ifeq (${ARM_LINUX_KERNEL_AS_BL33},1)
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ifneq (${ARCH},aarch64)
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$(error "ARM_LINUX_KERNEL_AS_BL33 is only available in AArch64.")
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endif
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ifneq (${RESET_TO_BL31},1)
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$(error "ARM_LINUX_KERNEL_AS_BL33 is only available if RESET_TO_BL31=1.")
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endif
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ifndef PRELOADED_BL33_BASE
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$(error "PRELOADED_BL33_BASE must be set if ARM_LINUX_KERNEL_AS_BL33 is used.")
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endif
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ifndef ARM_PRELOADED_DTB_BASE
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$(error "ARM_PRELOADED_DTB_BASE must be set if ARM_LINUX_KERNEL_AS_BL33 is used.")
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endif
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$(eval $(call add_define,ARM_PRELOADED_DTB_BASE))
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endif
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# Use an implementation of SHA-256 with a smaller memory footprint but reduced
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# speed.
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$(eval $(call add_define,MBEDTLS_SHA256_SMALLER))
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