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Diffstat (limited to 'bl31/bl31_main.c')
| -rw-r--r-- | bl31/bl31_main.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/bl31/bl31_main.c b/bl31/bl31_main.c new file mode 100644 index 0000000..2a3d838 --- /dev/null +++ b/bl31/bl31_main.c @@ -0,0 +1,292 @@ +/* + * Copyright (c) 2013-2022, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <string.h> + +#include <arch.h> +#include <arch_features.h> +#include <arch_helpers.h> +#include <bl31/bl31.h> +#include <bl31/ehf.h> +#include <common/bl_common.h> +#include <common/debug.h> +#include <common/feat_detect.h> +#include <common/runtime_svc.h> +#include <drivers/console.h> +#include <lib/el3_runtime/context_mgmt.h> +#include <lib/pmf/pmf.h> +#include <lib/runtime_instr.h> +#include <plat/common/platform.h> +#include <services/std_svc.h> + +#if ENABLE_RUNTIME_INSTRUMENTATION +PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID, + RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE) +#endif + +/******************************************************************************* + * This function pointer is used to initialise the BL32 image. It's initialized + * by SPD calling bl31_register_bl32_init after setting up all things necessary + * for SP execution. In cases where both SPD and SP are absent, or when SPD + * finds it impossible to execute SP, this pointer is left as NULL + ******************************************************************************/ +static int32_t (*bl32_init)(void); + +/***************************************************************************** + * Function used to initialise RMM if RME is enabled + *****************************************************************************/ +#if ENABLE_RME +static int32_t (*rmm_init)(void); +#endif + +/******************************************************************************* + * Variable to indicate whether next image to execute after BL31 is BL33 + * (non-secure & default) or BL32 (secure). + ******************************************************************************/ +static uint32_t next_image_type = NON_SECURE; + +#ifdef SUPPORT_UNKNOWN_MPID +/* + * Flag to know whether an unsupported MPID has been detected. To avoid having it + * landing on the .bss section, it is initialized to a non-zero value, this way + * we avoid potential WAW hazards during system bring up. + * */ +volatile uint32_t unsupported_mpid_flag = 1; +#endif + +/* + * Implement the ARM Standard Service function to get arguments for a + * particular service. + */ +uintptr_t get_arm_std_svc_args(unsigned int svc_mask) +{ + /* Setup the arguments for PSCI Library */ + DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint); + + /* PSCI is the only ARM Standard Service implemented */ + assert(svc_mask == PSCI_FID_MASK); + + return (uintptr_t)&psci_args; +} + +/******************************************************************************* + * Simple function to initialise all BL31 helper libraries. + ******************************************************************************/ +void __init bl31_lib_init(void) +{ + cm_init(); +} + +/******************************************************************************* + * Setup function for BL31. + ******************************************************************************/ +void bl31_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, + u_register_t arg3) +{ + /* Perform early platform-specific setup */ + bl31_early_platform_setup2(arg0, arg1, arg2, arg3); + + /* Perform late platform-specific setup */ + bl31_plat_arch_setup(); + +#if ENABLE_FEAT_HCX + /* + * Assert that FEAT_HCX is supported on this system, without this check + * an exception would occur during context save/restore if enabled but + * not supported. + */ + assert(is_feat_hcx_present()); +#endif /* ENABLE_FEAT_HCX */ + +#if CTX_INCLUDE_PAUTH_REGS + /* + * Assert that the ARMv8.3-PAuth registers are present or an access + * fault will be triggered when they are being saved or restored. + */ + assert(is_armv8_3_pauth_present()); +#endif /* CTX_INCLUDE_PAUTH_REGS */ +} + +/******************************************************************************* + * BL31 is responsible for setting up the runtime services for the primary cpu + * before passing control to the bootloader or an Operating System. This + * function calls runtime_svc_init() which initializes all registered runtime + * services. The run time services would setup enough context for the core to + * switch to the next exception level. When this function returns, the core will + * switch to the programmed exception level via an ERET. + ******************************************************************************/ +void bl31_main(void) +{ + NOTICE("BL31: %s\n", version_string); + NOTICE("BL31: %s\n", build_message); + +#if FEATURE_DETECTION + /* Detect if features enabled during compilation are supported by PE. */ + detect_arch_features(); +#endif /* FEATURE_DETECTION */ + +#ifdef SUPPORT_UNKNOWN_MPID + if (unsupported_mpid_flag == 0) { + NOTICE("Unsupported MPID detected!\n"); + } +#endif + + /* Perform platform setup in BL31 */ + bl31_platform_setup(); + + /* Initialise helper libraries */ + bl31_lib_init(); + +#if EL3_EXCEPTION_HANDLING + INFO("BL31: Initialising Exception Handling Framework\n"); + ehf_init(); +#endif + + /* Initialize the runtime services e.g. psci. */ + INFO("BL31: Initializing runtime services\n"); + runtime_svc_init(); + + /* + * All the cold boot actions on the primary cpu are done. We now need to + * decide which is the next image and how to execute it. + * If the SPD runtime service is present, it would want to pass control + * to BL32 first in S-EL1. In that case, SPD would have registered a + * function to initialize bl32 where it takes responsibility of entering + * S-EL1 and returning control back to bl31_main. Similarly, if RME is + * enabled and a function is registered to initialize RMM, control is + * transferred to RMM in R-EL2. After RMM initialization, control is + * returned back to bl31_main. Once this is done we can prepare entry + * into BL33 as normal. + */ + + /* + * If SPD had registered an init hook, invoke it. + */ + if (bl32_init != NULL) { + INFO("BL31: Initializing BL32\n"); + + int32_t rc = (*bl32_init)(); + + if (rc == 0) { + WARN("BL31: BL32 initialization failed\n"); + } + } + + /* + * If RME is enabled and init hook is registered, initialize RMM + * in R-EL2. + */ +#if ENABLE_RME + if (rmm_init != NULL) { + INFO("BL31: Initializing RMM\n"); + + int32_t rc = (*rmm_init)(); + + if (rc == 0) { + WARN("BL31: RMM initialization failed\n"); + } + } +#endif + + /* + * We are ready to enter the next EL. Prepare entry into the image + * corresponding to the desired security state after the next ERET. + */ + bl31_prepare_next_image_entry(); + + console_flush(); + + /* + * Perform any platform specific runtime setup prior to cold boot exit + * from BL31 + */ + bl31_plat_runtime_setup(); +} + +/******************************************************************************* + * Accessor functions to help runtime services decide which image should be + * executed after BL31. This is BL33 or the non-secure bootloader image by + * default but the Secure payload dispatcher could override this by requesting + * an entry into BL32 (Secure payload) first. If it does so then it should use + * the same API to program an entry into BL33 once BL32 initialisation is + * complete. + ******************************************************************************/ +void bl31_set_next_image_type(uint32_t security_state) +{ + assert(sec_state_is_valid(security_state)); + next_image_type = security_state; +} + +uint32_t bl31_get_next_image_type(void) +{ + return next_image_type; +} + +/******************************************************************************* + * This function programs EL3 registers and performs other setup to enable entry + * into the next image after BL31 at the next ERET. + ******************************************************************************/ +void __init bl31_prepare_next_image_entry(void) +{ + entry_point_info_t *next_image_info; + uint32_t image_type; + +#if CTX_INCLUDE_AARCH32_REGS + /* + * Ensure that the build flag to save AArch32 system registers in CPU + * context is not set for AArch64-only platforms. + */ + if (el_implemented(1) == EL_IMPL_A64ONLY) { + ERROR("EL1 supports AArch64-only. Please set build flag " + "CTX_INCLUDE_AARCH32_REGS = 0\n"); + panic(); + } +#endif + + /* Determine which image to execute next */ + image_type = bl31_get_next_image_type(); + + /* Program EL3 registers to enable entry into the next EL */ + next_image_info = bl31_plat_get_next_image_ep_info(image_type); + assert(next_image_info != NULL); + assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr)); + + INFO("BL31: Preparing for EL3 exit to %s world\n", + (image_type == SECURE) ? "secure" : "normal"); + print_entry_point_info(next_image_info); + cm_init_my_context(next_image_info); + + /* + * If we are entering the Non-secure world, use + * 'cm_prepare_el3_exit_ns' to exit. + */ + if (image_type == NON_SECURE) { + cm_prepare_el3_exit_ns(); + } else { + cm_prepare_el3_exit(image_type); + } +} + +/******************************************************************************* + * This function initializes the pointer to BL32 init function. This is expected + * to be called by the SPD after it finishes all its initialization + ******************************************************************************/ +void bl31_register_bl32_init(int32_t (*func)(void)) +{ + bl32_init = func; +} + +#if ENABLE_RME +/******************************************************************************* + * This function initializes the pointer to RMM init function. This is expected + * to be called by the RMMD after it finishes all its initialization + ******************************************************************************/ +void bl31_register_rmm_init(int32_t (*func)(void)) +{ + rmm_init = func; +} +#endif |