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https://github.com/CTCaer/switch-l4t-atf.git
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d6104f5ab4
Execution state switch
181 lines
6.2 KiB
C
181 lines
6.2 KiB
C
/*
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* Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch.h>
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#include <arch_helpers.h>
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#include <assert.h>
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#include <bl_common.h>
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#include <bl31.h>
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#include <console.h>
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#include <context_mgmt.h>
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#include <debug.h>
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#include <platform.h>
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#include <pmf.h>
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#include <runtime_instr.h>
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#include <runtime_svc.h>
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#include <string.h>
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#if ENABLE_RUNTIME_INSTRUMENTATION
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PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID,
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RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE)
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#endif
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/*******************************************************************************
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* This function pointer is used to initialise the BL32 image. It's initialized
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* by SPD calling bl31_register_bl32_init after setting up all things necessary
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* for SP execution. In cases where both SPD and SP are absent, or when SPD
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* finds it impossible to execute SP, this pointer is left as NULL
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******************************************************************************/
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static int32_t (*bl32_init)(void);
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/*******************************************************************************
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* Variable to indicate whether next image to execute after BL31 is BL33
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* (non-secure & default) or BL32 (secure).
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******************************************************************************/
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static uint32_t next_image_type = NON_SECURE;
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/*
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* Implement the ARM Standard Service function to get arguments for a
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* particular service.
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*/
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uintptr_t get_arm_std_svc_args(unsigned int svc_mask)
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{
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/* Setup the arguments for PSCI Library */
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DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint);
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/* PSCI is the only ARM Standard Service implemented */
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assert(svc_mask == PSCI_FID_MASK);
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return (uintptr_t)&psci_args;
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}
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/*******************************************************************************
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* Simple function to initialise all BL31 helper libraries.
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******************************************************************************/
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void bl31_lib_init(void)
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{
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cm_init();
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}
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/*******************************************************************************
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* BL31 is responsible for setting up the runtime services for the primary cpu
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* before passing control to the bootloader or an Operating System. This
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* function calls runtime_svc_init() which initializes all registered runtime
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* services. The run time services would setup enough context for the core to
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* swtich to the next exception level. When this function returns, the core will
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* switch to the programmed exception level via. an ERET.
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******************************************************************************/
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void bl31_main(void)
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{
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NOTICE("BL31: %s\n", version_string);
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NOTICE("BL31: %s\n", build_message);
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/* Perform platform setup in BL31 */
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bl31_platform_setup();
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/* Initialise helper libraries */
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bl31_lib_init();
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/* Initialize the runtime services e.g. psci. */
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INFO("BL31: Initializing runtime services\n");
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runtime_svc_init();
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/*
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* All the cold boot actions on the primary cpu are done. We now need to
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* decide which is the next image (BL32 or BL33) and how to execute it.
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* If the SPD runtime service is present, it would want to pass control
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* to BL32 first in S-EL1. In that case, SPD would have registered a
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* function to intialize bl32 where it takes responsibility of entering
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* S-EL1 and returning control back to bl31_main. Once this is done we
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* can prepare entry into BL33 as normal.
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*/
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/*
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* If SPD had registerd an init hook, invoke it.
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*/
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if (bl32_init) {
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INFO("BL31: Initializing BL32\n");
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(*bl32_init)();
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}
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/*
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* We are ready to enter the next EL. Prepare entry into the image
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* corresponding to the desired security state after the next ERET.
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*/
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bl31_prepare_next_image_entry();
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console_flush();
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/*
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* Perform any platform specific runtime setup prior to cold boot exit
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* from BL31
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*/
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bl31_plat_runtime_setup();
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}
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/*******************************************************************************
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* Accessor functions to help runtime services decide which image should be
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* executed after BL31. This is BL33 or the non-secure bootloader image by
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* default but the Secure payload dispatcher could override this by requesting
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* an entry into BL32 (Secure payload) first. If it does so then it should use
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* the same API to program an entry into BL33 once BL32 initialisation is
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* complete.
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******************************************************************************/
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void bl31_set_next_image_type(uint32_t security_state)
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{
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assert(sec_state_is_valid(security_state));
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next_image_type = security_state;
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}
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uint32_t bl31_get_next_image_type(void)
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{
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return next_image_type;
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}
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/*******************************************************************************
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* This function programs EL3 registers and performs other setup to enable entry
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* into the next image after BL31 at the next ERET.
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******************************************************************************/
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void bl31_prepare_next_image_entry(void)
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{
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entry_point_info_t *next_image_info;
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uint32_t image_type;
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#if CTX_INCLUDE_AARCH32_REGS
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/*
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* Ensure that the build flag to save AArch32 system registers in CPU
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* context is not set for AArch64-only platforms.
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*/
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if (EL_IMPLEMENTED(1) == EL_IMPL_A64ONLY) {
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ERROR("EL1 supports AArch64-only. Please set build flag "
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"CTX_INCLUDE_AARCH32_REGS = 0");
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panic();
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}
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#endif
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/* Determine which image to execute next */
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image_type = bl31_get_next_image_type();
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/* Program EL3 registers to enable entry into the next EL */
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next_image_info = bl31_plat_get_next_image_ep_info(image_type);
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assert(next_image_info);
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assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr));
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INFO("BL31: Preparing for EL3 exit to %s world\n",
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(image_type == SECURE) ? "secure" : "normal");
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print_entry_point_info(next_image_info);
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cm_init_my_context(next_image_info);
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cm_prepare_el3_exit(image_type);
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}
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/*******************************************************************************
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* This function initializes the pointer to BL32 init function. This is expected
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* to be called by the SPD after it finishes all its initialization
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******************************************************************************/
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void bl31_register_bl32_init(int32_t (*func)(void))
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{
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bl32_init = func;
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}
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