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docs(measured boot): add measured boot platform functions

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Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I411ee37cfeec32925849042689e8fdc7a26b7b13
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Manish V Badarkhe 2021-09-20 15:19:59 +01:00
parent 8a89e1898b
commit 9b3004cfbf
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91
docs/getting_started/porting-guide.rst
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@ -1199,6 +1199,25 @@ This function returns SMC_ARCH_CALL_SUCCESS if the platform supports
the SMCCC function specified in the argument; otherwise returns
SMC_ARCH_CALL_NOT_SUPPORTED.
Function : plat_mboot_measure_image()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::
Argument : unsigned int, image_info_t *
Return : void
When the MEASURED_BOOT flag is enabled:
- This function measures the given image and records its measurement using
the measured boot backend driver.
- On the Arm FVP port, this function measures the given image using its
passed id and information and then records that measurement in the
Event Log buffer.
- This function must return 0 on success, a negative error code otherwise.
When the MEASURED_BOOT flag is disabled, this function doesn't do anything.
Modifications specific to a Boot Loader stage
---------------------------------------------
@ -1450,6 +1469,42 @@ This function must return 0 on success, a non-null error code otherwise.
The default implementation of this function asserts therefore platforms must
override it when using the FWU feature.
Function : bl1_plat_mboot_init() [optional]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::
Argument : void
Return : void
When the MEASURED_BOOT flag is enabled:
- This function is used to initialize the backend driver(s) of measured boot.
- On the Arm FVP port, this function is used to initialize the Event Log
backend driver, and also to write header information in the Event Log buffer.
When the MEASURED_BOOT flag is disabled, this function doesn't do anything.
Function : bl1_plat_mboot_finish() [optional]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::
Argument : void
Return : void
When the MEASURED_BOOT flag is enabled:
- This function is used to finalize the measured boot backend driver(s),
and also, set the information for the next bootloader component to
extend the measurement if needed.
- On the Arm FVP port, this function is used to pass the base address of
the Event Log buffer and its size to BL2 via tb_fw_config to extend the
Event Log buffer with the measurement of various images loaded by BL2.
It results in panic on error.
When the MEASURED_BOOT flag is disabled, this function doesn't do anything.
Boot Loader Stage 2 (BL2)
-------------------------
@ -1738,6 +1793,42 @@ Application Processor (AP) for BL2U execution to continue.
This function returns 0 on success, a negative error code otherwise.
This function is included if SCP_BL2U_BASE is defined.
Function : bl2_plat_mboot_init() [optional]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::
Argument : void
Return : void
When the MEASURED_BOOT flag is enabled:
- This function is used to initialize the backend driver(s) of measured boot.
- On the Arm FVP port, this function is used to initialize the Event Log
backend driver with the Event Log buffer information (base address and
size) received from BL1. It results in panic on error.
When the MEASURED_BOOT flag is disabled, this function doesn't do anything.
Function : bl2_plat_mboot_finish() [optional]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::
Argument : void
Return : void
When the MEASURED_BOOT flag is enabled:
- This function is used to finalize the measured boot backend driver(s),
and also, set the information for the next bootloader component to extend
the measurement if needed.
- On the Arm FVP port, this function is used to pass the Event Log buffer
information (base address and size) to non-secure(BL33) and trusted OS(BL32)
via nt_fw and tos_fw config respectively. It results in panic on error.
When the MEASURED_BOOT flag is disabled, this function doesn't do anything.
Boot Loader Stage 3-1 (BL31)
----------------------------