| /* |
| * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <bl32/tsp/tsp.h> |
| #include <lib/xlat_tables/xlat_tables_defs.h> |
| |
| #include "../tsp_private.h" |
| |
| |
| .globl tsp_entrypoint |
| .globl tsp_vector_table |
| |
| |
| |
| /* --------------------------------------------- |
| * Populate the params in x0-x7 from the pointer |
| * to the smc args structure in x0. |
| * --------------------------------------------- |
| */ |
| .macro restore_args_call_smc |
| ldp x6, x7, [x0, #TSP_ARG6] |
| ldp x4, x5, [x0, #TSP_ARG4] |
| ldp x2, x3, [x0, #TSP_ARG2] |
| ldp x0, x1, [x0, #TSP_ARG0] |
| smc #0 |
| .endm |
| |
| .macro save_eret_context reg1 reg2 |
| mrs \reg1, elr_el1 |
| mrs \reg2, spsr_el1 |
| stp \reg1, \reg2, [sp, #-0x10]! |
| stp x30, x18, [sp, #-0x10]! |
| .endm |
| |
| .macro restore_eret_context reg1 reg2 |
| ldp x30, x18, [sp], #0x10 |
| ldp \reg1, \reg2, [sp], #0x10 |
| msr elr_el1, \reg1 |
| msr spsr_el1, \reg2 |
| .endm |
| |
| func tsp_entrypoint _align=3 |
| |
| /* --------------------------------------------- |
| * Set the exception vector to something sane. |
| * --------------------------------------------- |
| */ |
| adr x0, tsp_exceptions |
| msr vbar_el1, x0 |
| isb |
| |
| /* --------------------------------------------- |
| * Enable the SError interrupt now that the |
| * exception vectors have been setup. |
| * --------------------------------------------- |
| */ |
| msr daifclr, #DAIF_ABT_BIT |
| |
| /* --------------------------------------------- |
| * Enable the instruction cache, stack pointer |
| * and data access alignment checks and disable |
| * speculative loads. |
| * --------------------------------------------- |
| */ |
| mov x1, #(SCTLR_I_BIT | SCTLR_A_BIT | SCTLR_SA_BIT) |
| mrs x0, sctlr_el1 |
| orr x0, x0, x1 |
| bic x0, x0, #SCTLR_DSSBS_BIT |
| msr sctlr_el1, x0 |
| isb |
| |
| /* --------------------------------------------- |
| * Invalidate the RW memory used by the BL32 |
| * image. This includes the data and NOBITS |
| * sections. This is done to safeguard against |
| * possible corruption of this memory by dirty |
| * cache lines in a system cache as a result of |
| * use by an earlier boot loader stage. |
| * --------------------------------------------- |
| */ |
| adr x0, __RW_START__ |
| adr x1, __RW_END__ |
| sub x1, x1, x0 |
| bl inv_dcache_range |
| |
| /* --------------------------------------------- |
| * Zero out NOBITS sections. There are 2 of them: |
| * - the .bss section; |
| * - the coherent memory section. |
| * --------------------------------------------- |
| */ |
| ldr x0, =__BSS_START__ |
| ldr x1, =__BSS_SIZE__ |
| bl zeromem |
| |
| #if USE_COHERENT_MEM |
| ldr x0, =__COHERENT_RAM_START__ |
| ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__ |
| bl zeromem |
| #endif |
| |
| /* -------------------------------------------- |
| * Allocate a stack whose memory will be marked |
| * as Normal-IS-WBWA when the MMU is enabled. |
| * There is no risk of reading stale stack |
| * memory after enabling the MMU as only the |
| * primary cpu is running at the moment. |
| * -------------------------------------------- |
| */ |
| bl plat_set_my_stack |
| |
| /* --------------------------------------------- |
| * Initialize the stack protector canary before |
| * any C code is called. |
| * --------------------------------------------- |
| */ |
| #if STACK_PROTECTOR_ENABLED |
| bl update_stack_protector_canary |
| #endif |
| |
| /* --------------------------------------------- |
| * Perform TSP setup |
| * --------------------------------------------- |
| */ |
| bl tsp_setup |
| |
| /* --------------------------------------------- |
| * Enable pointer authentication |
| * --------------------------------------------- |
| */ |
| #if ENABLE_PAUTH |
| mrs x0, sctlr_el1 |
| orr x0, x0, #SCTLR_EnIA_BIT |
| msr sctlr_el1, x0 |
| isb |
| #endif /* ENABLE_PAUTH */ |
| |
| /* --------------------------------------------- |
| * Jump to main function. |
| * --------------------------------------------- |
| */ |
| bl tsp_main |
| |
| /* --------------------------------------------- |
| * Tell TSPD that we are done initialising |
| * --------------------------------------------- |
| */ |
| mov x1, x0 |
| mov x0, #TSP_ENTRY_DONE |
| smc #0 |
| |
| tsp_entrypoint_panic: |
| b tsp_entrypoint_panic |
| endfunc tsp_entrypoint |
| |
| |
| /* ------------------------------------------- |
| * Table of entrypoint vectors provided to the |
| * TSPD for the various entrypoints |
| * ------------------------------------------- |
| */ |
| func tsp_vector_table |
| b tsp_yield_smc_entry |
| b tsp_fast_smc_entry |
| b tsp_cpu_on_entry |
| b tsp_cpu_off_entry |
| b tsp_cpu_resume_entry |
| b tsp_cpu_suspend_entry |
| b tsp_sel1_intr_entry |
| b tsp_system_off_entry |
| b tsp_system_reset_entry |
| b tsp_abort_yield_smc_entry |
| endfunc tsp_vector_table |
| |
| /*--------------------------------------------- |
| * This entrypoint is used by the TSPD when this |
| * cpu is to be turned off through a CPU_OFF |
| * psci call to ask the TSP to perform any |
| * bookeeping necessary. In the current |
| * implementation, the TSPD expects the TSP to |
| * re-initialise its state so nothing is done |
| * here except for acknowledging the request. |
| * --------------------------------------------- |
| */ |
| func tsp_cpu_off_entry |
| bl tsp_cpu_off_main |
| restore_args_call_smc |
| endfunc tsp_cpu_off_entry |
| |
| /*--------------------------------------------- |
| * This entrypoint is used by the TSPD when the |
| * system is about to be switched off (through |
| * a SYSTEM_OFF psci call) to ask the TSP to |
| * perform any necessary bookkeeping. |
| * --------------------------------------------- |
| */ |
| func tsp_system_off_entry |
| bl tsp_system_off_main |
| restore_args_call_smc |
| endfunc tsp_system_off_entry |
| |
| /*--------------------------------------------- |
| * This entrypoint is used by the TSPD when the |
| * system is about to be reset (through a |
| * SYSTEM_RESET psci call) to ask the TSP to |
| * perform any necessary bookkeeping. |
| * --------------------------------------------- |
| */ |
| func tsp_system_reset_entry |
| bl tsp_system_reset_main |
| restore_args_call_smc |
| endfunc tsp_system_reset_entry |
| |
| /*--------------------------------------------- |
| * This entrypoint is used by the TSPD when this |
| * cpu is turned on using a CPU_ON psci call to |
| * ask the TSP to initialise itself i.e. setup |
| * the mmu, stacks etc. Minimal architectural |
| * state will be initialised by the TSPD when |
| * this function is entered i.e. Caches and MMU |
| * will be turned off, the execution state |
| * will be aarch64 and exceptions masked. |
| * --------------------------------------------- |
| */ |
| func tsp_cpu_on_entry |
| /* --------------------------------------------- |
| * Set the exception vector to something sane. |
| * --------------------------------------------- |
| */ |
| adr x0, tsp_exceptions |
| msr vbar_el1, x0 |
| isb |
| |
| /* Enable the SError interrupt */ |
| msr daifclr, #DAIF_ABT_BIT |
| |
| /* --------------------------------------------- |
| * Enable the instruction cache, stack pointer |
| * and data access alignment checks |
| * --------------------------------------------- |
| */ |
| mov x1, #(SCTLR_I_BIT | SCTLR_A_BIT | SCTLR_SA_BIT) |
| mrs x0, sctlr_el1 |
| orr x0, x0, x1 |
| msr sctlr_el1, x0 |
| isb |
| |
| /* -------------------------------------------- |
| * Give ourselves a stack whose memory will be |
| * marked as Normal-IS-WBWA when the MMU is |
| * enabled. |
| * -------------------------------------------- |
| */ |
| bl plat_set_my_stack |
| |
| /* -------------------------------------------- |
| * Enable MMU and D-caches together. |
| * -------------------------------------------- |
| */ |
| mov x0, #0 |
| bl bl32_plat_enable_mmu |
| |
| /* --------------------------------------------- |
| * Enter C runtime to perform any remaining |
| * book keeping |
| * --------------------------------------------- |
| */ |
| bl tsp_cpu_on_main |
| restore_args_call_smc |
| |
| /* Should never reach here */ |
| tsp_cpu_on_entry_panic: |
| b tsp_cpu_on_entry_panic |
| endfunc tsp_cpu_on_entry |
| |
| /*--------------------------------------------- |
| * This entrypoint is used by the TSPD when this |
| * cpu is to be suspended through a CPU_SUSPEND |
| * psci call to ask the TSP to perform any |
| * bookeeping necessary. In the current |
| * implementation, the TSPD saves and restores |
| * the EL1 state. |
| * --------------------------------------------- |
| */ |
| func tsp_cpu_suspend_entry |
| bl tsp_cpu_suspend_main |
| restore_args_call_smc |
| endfunc tsp_cpu_suspend_entry |
| |
| /*------------------------------------------------- |
| * This entrypoint is used by the TSPD to pass |
| * control for `synchronously` handling a S-EL1 |
| * Interrupt which was triggered while executing |
| * in normal world. 'x0' contains a magic number |
| * which indicates this. TSPD expects control to |
| * be handed back at the end of interrupt |
| * processing. This is done through an SMC. |
| * The handover agreement is: |
| * |
| * 1. PSTATE.DAIF are set upon entry. 'x1' has |
| * the ELR_EL3 from the non-secure state. |
| * 2. TSP has to preserve the callee saved |
| * general purpose registers, SP_EL1/EL0 and |
| * LR. |
| * 3. TSP has to preserve the system and vfp |
| * registers (if applicable). |
| * 4. TSP can use 'x0-x18' to enable its C |
| * runtime. |
| * 5. TSP returns to TSPD using an SMC with |
| * 'x0' = TSP_HANDLED_S_EL1_INTR |
| * ------------------------------------------------ |
| */ |
| func tsp_sel1_intr_entry |
| #if DEBUG |
| mov_imm x2, TSP_HANDLE_SEL1_INTR_AND_RETURN |
| cmp x0, x2 |
| b.ne tsp_sel1_int_entry_panic |
| #endif |
| /*------------------------------------------------- |
| * Save any previous context needed to perform |
| * an exception return from S-EL1 e.g. context |
| * from a previous Non secure Interrupt. |
| * Update statistics and handle the S-EL1 |
| * interrupt before returning to the TSPD. |
| * IRQ/FIQs are not enabled since that will |
| * complicate the implementation. Execution |
| * will be transferred back to the normal world |
| * in any case. The handler can return 0 |
| * if the interrupt was handled or TSP_PREEMPTED |
| * if the expected interrupt was preempted |
| * by an interrupt that should be handled in EL3 |
| * e.g. Group 0 interrupt in GICv3. In both |
| * the cases switch to EL3 using SMC with id |
| * TSP_HANDLED_S_EL1_INTR. Any other return value |
| * from the handler will result in panic. |
| * ------------------------------------------------ |
| */ |
| save_eret_context x2 x3 |
| bl tsp_update_sync_sel1_intr_stats |
| bl tsp_common_int_handler |
| /* Check if the S-EL1 interrupt has been handled */ |
| cbnz x0, tsp_sel1_intr_check_preemption |
| b tsp_sel1_intr_return |
| tsp_sel1_intr_check_preemption: |
| /* Check if the S-EL1 interrupt has been preempted */ |
| mov_imm x1, TSP_PREEMPTED |
| cmp x0, x1 |
| b.ne tsp_sel1_int_entry_panic |
| tsp_sel1_intr_return: |
| mov_imm x0, TSP_HANDLED_S_EL1_INTR |
| restore_eret_context x2 x3 |
| smc #0 |
| |
| /* Should never reach here */ |
| tsp_sel1_int_entry_panic: |
| no_ret plat_panic_handler |
| endfunc tsp_sel1_intr_entry |
| |
| /*--------------------------------------------- |
| * This entrypoint is used by the TSPD when this |
| * cpu resumes execution after an earlier |
| * CPU_SUSPEND psci call to ask the TSP to |
| * restore its saved context. In the current |
| * implementation, the TSPD saves and restores |
| * EL1 state so nothing is done here apart from |
| * acknowledging the request. |
| * --------------------------------------------- |
| */ |
| func tsp_cpu_resume_entry |
| bl tsp_cpu_resume_main |
| restore_args_call_smc |
| |
| /* Should never reach here */ |
| no_ret plat_panic_handler |
| endfunc tsp_cpu_resume_entry |
| |
| /*--------------------------------------------- |
| * This entrypoint is used by the TSPD to ask |
| * the TSP to service a fast smc request. |
| * --------------------------------------------- |
| */ |
| func tsp_fast_smc_entry |
| bl tsp_smc_handler |
| restore_args_call_smc |
| |
| /* Should never reach here */ |
| no_ret plat_panic_handler |
| endfunc tsp_fast_smc_entry |
| |
| /*--------------------------------------------- |
| * This entrypoint is used by the TSPD to ask |
| * the TSP to service a Yielding SMC request. |
| * We will enable preemption during execution |
| * of tsp_smc_handler. |
| * --------------------------------------------- |
| */ |
| func tsp_yield_smc_entry |
| msr daifclr, #DAIF_FIQ_BIT | DAIF_IRQ_BIT |
| bl tsp_smc_handler |
| msr daifset, #DAIF_FIQ_BIT | DAIF_IRQ_BIT |
| restore_args_call_smc |
| |
| /* Should never reach here */ |
| no_ret plat_panic_handler |
| endfunc tsp_yield_smc_entry |
| |
| /*--------------------------------------------------------------------- |
| * This entrypoint is used by the TSPD to abort a pre-empted Yielding |
| * SMC. It could be on behalf of non-secure world or because a CPU |
| * suspend/CPU off request needs to abort the preempted SMC. |
| * -------------------------------------------------------------------- |
| */ |
| func tsp_abort_yield_smc_entry |
| |
| /* |
| * Exceptions masking is already done by the TSPD when entering this |
| * hook so there is no need to do it here. |
| */ |
| |
| /* Reset the stack used by the pre-empted SMC */ |
| bl plat_set_my_stack |
| |
| /* |
| * Allow some cleanup such as releasing locks. |
| */ |
| bl tsp_abort_smc_handler |
| |
| restore_args_call_smc |
| |
| /* Should never reach here */ |
| bl plat_panic_handler |
| endfunc tsp_abort_yield_smc_entry |