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Diffstat (limited to '')
| -rw-r--r-- | bl1/bl1_main.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/bl1/bl1_main.c b/bl1/bl1_main.c new file mode 100644 index 0000000..7399bc8 --- /dev/null +++ b/bl1/bl1_main.c @@ -0,0 +1,287 @@ +/* + * Copyright (c) 2013-2022, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> + +#include <platform_def.h> + +#include <arch.h> +#include <arch_features.h> +#include <arch_helpers.h> +#include <bl1/bl1.h> +#include <common/bl_common.h> +#include <common/debug.h> +#include <drivers/auth/auth_mod.h> +#include <drivers/auth/crypto_mod.h> +#include <drivers/console.h> +#include <lib/cpus/errata_report.h> +#include <lib/utils.h> +#include <plat/common/platform.h> +#include <smccc_helpers.h> +#include <tools_share/uuid.h> + +#include "bl1_private.h" + +static void bl1_load_bl2(void); + +#if ENABLE_PAUTH +uint64_t bl1_apiakey[2]; +#endif + +/******************************************************************************* + * Helper utility to calculate the BL2 memory layout taking into consideration + * the BL1 RW data assuming that it is at the top of the memory layout. + ******************************************************************************/ +void bl1_calc_bl2_mem_layout(const meminfo_t *bl1_mem_layout, + meminfo_t *bl2_mem_layout) +{ + assert(bl1_mem_layout != NULL); + assert(bl2_mem_layout != NULL); + + /* + * Remove BL1 RW data from the scope of memory visible to BL2. + * This is assuming BL1 RW data is at the top of bl1_mem_layout. + */ + assert(BL1_RW_BASE > bl1_mem_layout->total_base); + bl2_mem_layout->total_base = bl1_mem_layout->total_base; + bl2_mem_layout->total_size = BL1_RW_BASE - bl1_mem_layout->total_base; + + flush_dcache_range((uintptr_t)bl2_mem_layout, sizeof(meminfo_t)); +} + +/******************************************************************************* + * Setup function for BL1. + ******************************************************************************/ +void bl1_setup(void) +{ + /* Perform early platform-specific setup */ + bl1_early_platform_setup(); + + /* Perform late platform-specific setup */ + bl1_plat_arch_setup(); + +#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 */ +} + +/******************************************************************************* + * Function to perform late architectural and platform specific initialization. + * It also queries the platform to load and run next BL image. Only called + * by the primary cpu after a cold boot. + ******************************************************************************/ +void bl1_main(void) +{ + unsigned int image_id; + + /* Announce our arrival */ + NOTICE(FIRMWARE_WELCOME_STR); + NOTICE("BL1: %s\n", version_string); + NOTICE("BL1: %s\n", build_message); + + INFO("BL1: RAM %p - %p\n", (void *)BL1_RAM_BASE, (void *)BL1_RAM_LIMIT); + + print_errata_status(); + +#if ENABLE_ASSERTIONS + u_register_t val; + /* + * Ensure that MMU/Caches and coherency are turned on + */ +#ifdef __aarch64__ + val = read_sctlr_el3(); +#else + val = read_sctlr(); +#endif + assert((val & SCTLR_M_BIT) != 0); + assert((val & SCTLR_C_BIT) != 0); + assert((val & SCTLR_I_BIT) != 0); + /* + * Check that Cache Writeback Granule (CWG) in CTR_EL0 matches the + * provided platform value + */ + val = (read_ctr_el0() >> CTR_CWG_SHIFT) & CTR_CWG_MASK; + /* + * If CWG is zero, then no CWG information is available but we can + * at least check the platform value is less than the architectural + * maximum. + */ + if (val != 0) + assert(CACHE_WRITEBACK_GRANULE == SIZE_FROM_LOG2_WORDS(val)); + else + assert(CACHE_WRITEBACK_GRANULE <= MAX_CACHE_LINE_SIZE); +#endif /* ENABLE_ASSERTIONS */ + + /* Perform remaining generic architectural setup from EL3 */ + bl1_arch_setup(); + + crypto_mod_init(); + + /* Initialize authentication module */ + auth_mod_init(); + + /* Initialize the measured boot */ + bl1_plat_mboot_init(); + + /* Perform platform setup in BL1. */ + bl1_platform_setup(); + +#if ENABLE_PAUTH + /* Store APIAKey_EL1 key */ + bl1_apiakey[0] = read_apiakeylo_el1(); + bl1_apiakey[1] = read_apiakeyhi_el1(); +#endif /* ENABLE_PAUTH */ + + /* Get the image id of next image to load and run. */ + image_id = bl1_plat_get_next_image_id(); + + /* + * We currently interpret any image id other than + * BL2_IMAGE_ID as the start of firmware update. + */ + if (image_id == BL2_IMAGE_ID) + bl1_load_bl2(); + else + NOTICE("BL1-FWU: *******FWU Process Started*******\n"); + + /* Teardown the measured boot driver */ + bl1_plat_mboot_finish(); + + bl1_prepare_next_image(image_id); + + console_flush(); +} + +/******************************************************************************* + * This function locates and loads the BL2 raw binary image in the trusted SRAM. + * Called by the primary cpu after a cold boot. + * TODO: Add support for alternative image load mechanism e.g using virtio/elf + * loader etc. + ******************************************************************************/ +static void bl1_load_bl2(void) +{ + image_desc_t *desc; + image_info_t *info; + int err; + + /* Get the image descriptor */ + desc = bl1_plat_get_image_desc(BL2_IMAGE_ID); + assert(desc != NULL); + + /* Get the image info */ + info = &desc->image_info; + INFO("BL1: Loading BL2\n"); + + err = bl1_plat_handle_pre_image_load(BL2_IMAGE_ID); + if (err != 0) { + ERROR("Failure in pre image load handling of BL2 (%d)\n", err); + plat_error_handler(err); + } + + err = load_auth_image(BL2_IMAGE_ID, info); + if (err != 0) { + ERROR("Failed to load BL2 firmware.\n"); + plat_error_handler(err); + } + + /* Allow platform to handle image information. */ + err = bl1_plat_handle_post_image_load(BL2_IMAGE_ID); + if (err != 0) { + ERROR("Failure in post image load handling of BL2 (%d)\n", err); + plat_error_handler(err); + } + + NOTICE("BL1: Booting BL2\n"); +} + +/******************************************************************************* + * Function called just before handing over to the next BL to inform the user + * about the boot progress. In debug mode, also print details about the BL + * image's execution context. + ******************************************************************************/ +void bl1_print_next_bl_ep_info(const entry_point_info_t *bl_ep_info) +{ +#ifdef __aarch64__ + NOTICE("BL1: Booting BL31\n"); +#else + NOTICE("BL1: Booting BL32\n"); +#endif /* __aarch64__ */ + print_entry_point_info(bl_ep_info); +} + +#if SPIN_ON_BL1_EXIT +void print_debug_loop_message(void) +{ + NOTICE("BL1: Debug loop, spinning forever\n"); + NOTICE("BL1: Please connect the debugger to continue\n"); +} +#endif + +/******************************************************************************* + * Top level handler for servicing BL1 SMCs. + ******************************************************************************/ +u_register_t bl1_smc_handler(unsigned int smc_fid, + u_register_t x1, + u_register_t x2, + u_register_t x3, + u_register_t x4, + void *cookie, + void *handle, + unsigned int flags) +{ + /* BL1 Service UUID */ + DEFINE_SVC_UUID2(bl1_svc_uid, + U(0xd46739fd), 0xcb72, 0x9a4d, 0xb5, 0x75, + 0x67, 0x15, 0xd6, 0xf4, 0xbb, 0x4a); + + +#if TRUSTED_BOARD_BOOT + /* + * Dispatch FWU calls to FWU SMC handler and return its return + * value + */ + if (is_fwu_fid(smc_fid)) { + return bl1_fwu_smc_handler(smc_fid, x1, x2, x3, x4, cookie, + handle, flags); + } +#endif + + switch (smc_fid) { + case BL1_SMC_CALL_COUNT: + SMC_RET1(handle, BL1_NUM_SMC_CALLS); + + case BL1_SMC_UID: + SMC_UUID_RET(handle, bl1_svc_uid); + + case BL1_SMC_VERSION: + SMC_RET1(handle, BL1_SMC_MAJOR_VER | BL1_SMC_MINOR_VER); + + default: + WARN("Unimplemented BL1 SMC Call: 0x%x\n", smc_fid); + SMC_RET1(handle, SMC_UNK); + } +} + +/******************************************************************************* + * BL1 SMC wrapper. This function is only used in AArch32 mode to ensure ABI + * compliance when invoking bl1_smc_handler. + ******************************************************************************/ +u_register_t bl1_smc_wrapper(uint32_t smc_fid, + void *cookie, + void *handle, + unsigned int flags) +{ + u_register_t x1, x2, x3, x4; + + assert(handle != NULL); + + get_smc_params_from_ctx(handle, x1, x2, x3, x4); + return bl1_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle, flags); +} |