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Tegra: retrieve BL32's bootargs from bl32_ep_info 

This patch removes the bootargs pointer from the platform params
structure. Instead the bootargs are passed by the BL2 in the
bl32_ep_info struct which is a part of the EL3 params struct.

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
This commit is contained in:
Varun Wadekar 2015-07-31 10:03:01 +05:30
parent 42ca2d86c8
commit 0bf1b022f2
3 changed files with 18 additions and 12 deletions
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20
docs/spd/tlk-dispatcher.md
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@ -10,12 +10,9 @@ In order to compile TLK-D, we need a BL32 image to be present. Since, TLKD
just needs to compile, any BL32 image would do. To use TLK as the BL32, please just needs to compile, any BL32 image would do. To use TLK as the BL32, please
refer to the "Build TLK" section. refer to the "Build TLK" section.
Once a BL32 is ready, TLKD can be included in the image using the following Once a BL32 is ready, TLKD can be included in the image by adding "SPD=tlkd"
command: to the build command.
CROSS_COMPILE=<path_to_linaro_chain>/bin/aarch64-none-elf- make NEED_BL1=0
NEED_BL2=0 BL32=<path_to_BL32_image> PLAT=<platform> SPD=tlkd all
_
Trusted Little Kernel (TLK) Trusted Little Kernel (TLK)
=========================== ===========================
TLK is a Trusted OS running as Secure EL1. It is a Free Open Source Software TLK is a Trusted OS running as Secure EL1. It is a Free Open Source Software
@ -58,3 +55,16 @@ Build TLK
========= =========
To build and execute TLK, follow the instructions from "Building a TLK Device" To build and execute TLK, follow the instructions from "Building a TLK Device"
section from Tegra_BSP_for_Android_TLK_FOSS_Reference.pdf manual. section from Tegra_BSP_for_Android_TLK_FOSS_Reference.pdf manual.
Input parameters to TLK
=======================
TLK expects the TZDRAM size and a structure containing the boot arguments. BL2
passes this information to the EL3 software as members of the bl32_ep_info
struct, where bl32_ep_info is part of bl31_params_t (passed by BL2 in X0)
Example:
--------
bl32_ep_info->args.arg0 = TZDRAM size available for BL32
bl32_ep_info->args.arg1 = unused (used only on ARMv7)
bl32_ep_info->args.arg2 = pointer to boot args

9
plat/nvidia/tegra/common/tegra_bl31_setup.c
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@ -85,7 +85,7 @@ extern uint64_t tegra_bl31_phys_base;
static entry_point_info_t bl33_image_ep_info, bl32_image_ep_info; static entry_point_info_t bl33_image_ep_info, bl32_image_ep_info;
static plat_params_from_bl2_t plat_bl31_params_from_bl2 = { static plat_params_from_bl2_t plat_bl31_params_from_bl2 = {
(uint64_t)TZDRAM_SIZE, (uintptr_t)NULL .tzdram_size = (uint64_t)TZDRAM_SIZE
}; };
/******************************************************************************* /*******************************************************************************
@ -145,13 +145,10 @@ void bl31_early_platform_setup(bl31_params_t *from_bl2,
bl32_image_ep_info = *from_bl2->bl32_ep_info; bl32_image_ep_info = *from_bl2->bl32_ep_info;
/* /*
* Parse platform specific parameters - TZDRAM aperture size and * Parse platform specific parameters - TZDRAM aperture size
* pointer to BL32 params.
*/ */
if (plat_params) { if (plat_params)
plat_bl31_params_from_bl2.tzdram_size = plat_params->tzdram_size; plat_bl31_params_from_bl2.tzdram_size = plat_params->tzdram_size;
plat_bl31_params_from_bl2.bl32_params = plat_params->bl32_params;
}
} }
/******************************************************************************* /*******************************************************************************

1
plat/nvidia/tegra/include/tegra_private.h
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@ -42,7 +42,6 @@
typedef struct plat_params_from_bl2 { typedef struct plat_params_from_bl2 {
uint64_t tzdram_size; uint64_t tzdram_size;
uintptr_t bl32_params;
} plat_params_from_bl2_t; } plat_params_from_bl2_t;
/* Declarations for plat_psci_handlers.c */ /* Declarations for plat_psci_handlers.c */