| /* |
| * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #ifndef EL2_COMMON_MACROS_S |
| #define EL2_COMMON_MACROS_S |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <context.h> |
| #include <lib/xlat_tables/xlat_tables_defs.h> |
| |
| #include <platform_def.h> |
| |
| /* |
| * Helper macro to initialise system registers at EL2. |
| */ |
| .macro el2_arch_init_common |
| |
| /* --------------------------------------------------------------------- |
| * SCTLR_EL2 has already been initialised - read current value before |
| * modifying. |
| * |
| * SCTLR_EL2.I: Enable the instruction cache. |
| * |
| * SCTLR_EL2.SA: Enable Stack Alignment check. A SP alignment fault |
| * exception is generated if a load or store instruction executed at |
| * EL2 uses the SP as the base address and the SP is not aligned to a |
| * 16-byte boundary. |
| * |
| * SCTLR_EL2.A: Enable Alignment fault checking. All instructions that |
| * load or store one or more registers have an alignment check that the |
| * address being accessed is aligned to the size of the data element(s) |
| * being accessed. |
| * --------------------------------------------------------------------- |
| */ |
| mov x1, #(SCTLR_I_BIT | SCTLR_A_BIT | SCTLR_SA_BIT) |
| mrs x0, sctlr_el2 |
| orr x0, x0, x1 |
| msr sctlr_el2, x0 |
| isb |
| |
| /* --------------------------------------------------------------------- |
| * Initialise HCR_EL2, setting all fields rather than relying on HW. |
| * All fields are architecturally UNKNOWN on reset. The following fields |
| * do not change during the TF lifetime. The remaining fields are set to |
| * zero here but are updated ahead of transitioning to a lower EL in the |
| * function cm_init_context_common(). |
| * |
| * HCR_EL2.TWE: Set to zero so that execution of WFE instructions at |
| * EL2, EL1 and EL0 are not trapped to EL2. |
| * |
| * HCR_EL2.TWI: Set to zero so that execution of WFI instructions at |
| * EL2, EL1 and EL0 are not trapped to EL2. |
| * |
| * HCR_EL2.HCD: Set to zero to enable HVC calls at EL1 and above, |
| * from both Security states and both Execution states. |
| * |
| * HCR_EL2.TEA: Set to one to route External Aborts and SError |
| * Interrupts to EL2 when executing at any EL. |
| * |
| * HCR_EL2.{API,APK}: For Armv8.3 pointer authentication feature, |
| * disable traps to EL2 when accessing key registers or using |
| * pointer authentication instructions from lower ELs. |
| * --------------------------------------------------------------------- |
| */ |
| mov_imm x0, ((HCR_RESET_VAL | HCR_TEA_BIT) \ |
| & ~(HCR_TWE_BIT | HCR_TWI_BIT | HCR_HCD_BIT)) |
| #if CTX_INCLUDE_PAUTH_REGS |
| /* |
| * If the pointer authentication registers are saved during world |
| * switches, enable pointer authentication everywhere, as it is safe to |
| * do so. |
| */ |
| orr x0, x0, #(HCR_API_BIT | HCR_APK_BIT) |
| #endif /* CTX_INCLUDE_PAUTH_REGS */ |
| msr hcr_el2, x0 |
| |
| /* --------------------------------------------------------------------- |
| * Initialise MDCR_EL2, setting all fields rather than relying on |
| * hw. Some fields are architecturally UNKNOWN on reset. |
| * |
| * MDCR_EL2.TDOSA: Set to zero so that EL2 and EL2 System register |
| * access to the powerdown debug registers do not trap to EL2. |
| * |
| * MDCR_EL2.TDA: Set to zero to allow EL0, EL1 and EL2 access to the |
| * debug registers, other than those registers that are controlled by |
| * MDCR_EL2.TDOSA. |
| * |
| * MDCR_EL2.TPM: Set to zero so that EL0, EL1, and EL2 System |
| * register accesses to all Performance Monitors registers do not trap |
| * to EL2. |
| * |
| * MDCR_EL2.HPMD: Set to zero so that event counting by the program- |
| * mable counters PMEVCNTR<n>_EL0 is prohibited in Secure state. If |
| * ARMv8.2 Debug is not implemented this bit does not have any effect |
| * on the counters unless there is support for the implementation |
| * defined authentication interface |
| * ExternalSecureNoninvasiveDebugEnabled(). |
| * --------------------------------------------------------------------- |
| */ |
| mov_imm x0, ((MDCR_EL2_RESET_VAL | \ |
| MDCR_SPD32(MDCR_SPD32_DISABLE)) \ |
| & ~(MDCR_EL2_HPMD | MDCR_TDOSA_BIT | \ |
| MDCR_TDA_BIT | MDCR_TPM_BIT)) |
| |
| msr mdcr_el2, x0 |
| |
| /* --------------------------------------------------------------------- |
| * Initialise PMCR_EL0 setting all fields rather than relying |
| * on hw. Some fields are architecturally UNKNOWN on reset. |
| * |
| * PMCR_EL0.DP: Set to one so that the cycle counter, |
| * PMCCNTR_EL0 does not count when event counting is prohibited. |
| * |
| * PMCR_EL0.X: Set to zero to disable export of events. |
| * |
| * PMCR_EL0.D: Set to zero so that, when enabled, PMCCNTR_EL0 |
| * counts on every clock cycle. |
| * --------------------------------------------------------------------- |
| */ |
| mov_imm x0, ((PMCR_EL0_RESET_VAL | PMCR_EL0_DP_BIT) & \ |
| ~(PMCR_EL0_X_BIT | PMCR_EL0_D_BIT)) |
| |
| msr pmcr_el0, x0 |
| |
| /* --------------------------------------------------------------------- |
| * Enable External Aborts and SError Interrupts now that the exception |
| * vectors have been setup. |
| * --------------------------------------------------------------------- |
| */ |
| msr daifclr, #DAIF_ABT_BIT |
| |
| /* --------------------------------------------------------------------- |
| * Initialise CPTR_EL2, setting all fields rather than relying on hw. |
| * All fields are architecturally UNKNOWN on reset. |
| * |
| * CPTR_EL2.TCPAC: Set to zero so that any accesses to CPACR_EL1 do |
| * not trap to EL2. |
| * |
| * CPTR_EL2.TTA: Set to zero so that System register accesses to the |
| * trace registers do not trap to EL2. |
| * |
| * CPTR_EL2.TFP: Set to zero so that accesses to the V- or Z- registers |
| * by Advanced SIMD, floating-point or SVE instructions (if implemented) |
| * do not trap to EL2. |
| */ |
| |
| mov_imm x0, (CPTR_EL2_RESET_VAL & ~(TCPAC_BIT | TTA_BIT | TFP_BIT)) |
| msr cptr_el2, x0 |
| |
| /* |
| * If Data Independent Timing (DIT) functionality is implemented, |
| * always enable DIT in EL2 |
| */ |
| mrs x0, id_aa64pfr0_el1 |
| ubfx x0, x0, #ID_AA64PFR0_DIT_SHIFT, #ID_AA64PFR0_DIT_LENGTH |
| cmp x0, #ID_AA64PFR0_DIT_SUPPORTED |
| bne 1f |
| mov x0, #DIT_BIT |
| msr DIT, x0 |
| 1: |
| .endm |
| |
| /* ----------------------------------------------------------------------------- |
| * This is the super set of actions that need to be performed during a cold boot |
| * or a warm boot in EL2. This code is shared by BL1 and BL31. |
| * |
| * This macro will always perform reset handling, architectural initialisations |
| * and stack setup. The rest of the actions are optional because they might not |
| * be needed, depending on the context in which this macro is called. This is |
| * why this macro is parameterised ; each parameter allows to enable/disable |
| * some actions. |
| * |
| * _init_sctlr: |
| * Whether the macro needs to initialise SCTLR_EL2, including configuring |
| * the endianness of data accesses. |
| * |
| * _warm_boot_mailbox: |
| * Whether the macro needs to detect the type of boot (cold/warm). The |
| * detection is based on the platform entrypoint address : if it is zero |
| * then it is a cold boot, otherwise it is a warm boot. In the latter case, |
| * this macro jumps on the platform entrypoint address. |
| * |
| * _secondary_cold_boot: |
| * Whether the macro needs to identify the CPU that is calling it: primary |
| * CPU or secondary CPU. The primary CPU will be allowed to carry on with |
| * the platform initialisations, while the secondaries will be put in a |
| * platform-specific state in the meantime. |
| * |
| * If the caller knows this macro will only be called by the primary CPU |
| * then this parameter can be defined to 0 to skip this step. |
| * |
| * _init_memory: |
| * Whether the macro needs to initialise the memory. |
| * |
| * _init_c_runtime: |
| * Whether the macro needs to initialise the C runtime environment. |
| * |
| * _exception_vectors: |
| * Address of the exception vectors to program in the VBAR_EL2 register. |
| * |
| * _pie_fixup_size: |
| * Size of memory region to fixup Global Descriptor Table (GDT). |
| * |
| * A non-zero value is expected when firmware needs GDT to be fixed-up. |
| * |
| * ----------------------------------------------------------------------------- |
| */ |
| .macro el2_entrypoint_common \ |
| _init_sctlr, _warm_boot_mailbox, _secondary_cold_boot, \ |
| _init_memory, _init_c_runtime, _exception_vectors, \ |
| _pie_fixup_size |
| |
| .if \_init_sctlr |
| /* ------------------------------------------------------------- |
| * This is the initialisation of SCTLR_EL2 and so must ensure |
| * that all fields are explicitly set rather than relying on hw. |
| * Some fields reset to an IMPLEMENTATION DEFINED value and |
| * others are architecturally UNKNOWN on reset. |
| * |
| * SCTLR.EE: Set the CPU endianness before doing anything that |
| * might involve memory reads or writes. Set to zero to select |
| * Little Endian. |
| * |
| * SCTLR_EL2.WXN: For the EL2 translation regime, this field can |
| * force all memory regions that are writeable to be treated as |
| * XN (Execute-never). Set to zero so that this control has no |
| * effect on memory access permissions. |
| * |
| * SCTLR_EL2.SA: Set to zero to disable Stack Alignment check. |
| * |
| * SCTLR_EL2.A: Set to zero to disable Alignment fault checking. |
| * |
| * SCTLR.DSSBS: Set to zero to disable speculation store bypass |
| * safe behaviour upon exception entry to EL2. |
| * ------------------------------------------------------------- |
| */ |
| mov_imm x0, (SCTLR_RESET_VAL & ~(SCTLR_EE_BIT | SCTLR_WXN_BIT \ |
| | SCTLR_SA_BIT | SCTLR_A_BIT | SCTLR_DSSBS_BIT)) |
| msr sctlr_el2, x0 |
| isb |
| .endif /* _init_sctlr */ |
| |
| #if DISABLE_MTPMU |
| bl mtpmu_disable |
| #endif |
| |
| .if \_warm_boot_mailbox |
| /* ------------------------------------------------------------- |
| * This code will be executed for both warm and cold resets. |
| * Now is the time to distinguish between the two. |
| * Query the platform entrypoint address and if it is not zero |
| * then it means it is a warm boot so jump to this address. |
| * ------------------------------------------------------------- |
| */ |
| bl plat_get_my_entrypoint |
| cbz x0, do_cold_boot |
| br x0 |
| |
| do_cold_boot: |
| .endif /* _warm_boot_mailbox */ |
| |
| .if \_pie_fixup_size |
| #if ENABLE_PIE |
| /* |
| * ------------------------------------------------------------ |
| * If PIE is enabled fixup the Global descriptor Table only |
| * once during primary core cold boot path. |
| * |
| * Compile time base address, required for fixup, is calculated |
| * using "pie_fixup" label present within first page. |
| * ------------------------------------------------------------ |
| */ |
| pie_fixup: |
| ldr x0, =pie_fixup |
| and x0, x0, #~(PAGE_SIZE_MASK) |
| mov_imm x1, \_pie_fixup_size |
| add x1, x1, x0 |
| bl fixup_gdt_reloc |
| #endif /* ENABLE_PIE */ |
| .endif /* _pie_fixup_size */ |
| |
| /* --------------------------------------------------------------------- |
| * Set the exception vectors. |
| * --------------------------------------------------------------------- |
| */ |
| adr x0, \_exception_vectors |
| msr vbar_el2, x0 |
| isb |
| |
| /* --------------------------------------------------------------------- |
| * It is a cold boot. |
| * Perform any processor specific actions upon reset e.g. cache, TLB |
| * invalidations etc. |
| * --------------------------------------------------------------------- |
| */ |
| bl reset_handler |
| |
| el2_arch_init_common |
| |
| .if \_secondary_cold_boot |
| /* ------------------------------------------------------------- |
| * Check if this is a primary or secondary CPU cold boot. |
| * The primary CPU will set up the platform while the |
| * secondaries are placed in a platform-specific state until the |
| * primary CPU performs the necessary actions to bring them out |
| * of that state and allows entry into the OS. |
| * ------------------------------------------------------------- |
| */ |
| bl plat_is_my_cpu_primary |
| cbnz w0, do_primary_cold_boot |
| |
| /* This is a cold boot on a secondary CPU */ |
| bl plat_secondary_cold_boot_setup |
| /* plat_secondary_cold_boot_setup() is not supposed to return */ |
| bl el2_panic |
| do_primary_cold_boot: |
| .endif /* _secondary_cold_boot */ |
| |
| /* --------------------------------------------------------------------- |
| * Initialize memory now. Secondary CPU initialization won't get to this |
| * point. |
| * --------------------------------------------------------------------- |
| */ |
| |
| .if \_init_memory |
| bl platform_mem_init |
| .endif /* _init_memory */ |
| |
| /* --------------------------------------------------------------------- |
| * Init C runtime environment: |
| * - Zero-initialise the NOBITS sections. There are 2 of them: |
| * - the .bss section; |
| * - the coherent memory section (if any). |
| * - Relocate the data section from ROM to RAM, if required. |
| * --------------------------------------------------------------------- |
| */ |
| .if \_init_c_runtime |
| adrp x0, __BSS_START__ |
| add x0, x0, :lo12:__BSS_START__ |
| |
| adrp x1, __BSS_END__ |
| add x1, x1, :lo12:__BSS_END__ |
| sub x1, x1, x0 |
| bl zeromem |
| |
| #if defined(IMAGE_BL1) || (defined(IMAGE_BL2) && BL2_AT_EL3 && BL2_IN_XIP_MEM) |
| adrp x0, __DATA_RAM_START__ |
| add x0, x0, :lo12:__DATA_RAM_START__ |
| adrp x1, __DATA_ROM_START__ |
| add x1, x1, :lo12:__DATA_ROM_START__ |
| adrp x2, __DATA_RAM_END__ |
| add x2, x2, :lo12:__DATA_RAM_END__ |
| sub x2, x2, x0 |
| bl memcpy16 |
| #endif |
| .endif /* _init_c_runtime */ |
| |
| /* --------------------------------------------------------------------- |
| * Use SP_EL0 for the C runtime stack. |
| * --------------------------------------------------------------------- |
| */ |
| msr spsel, #0 |
| |
| /* --------------------------------------------------------------------- |
| * 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 |
| |
| #if STACK_PROTECTOR_ENABLED |
| .if \_init_c_runtime |
| bl update_stack_protector_canary |
| .endif /* _init_c_runtime */ |
| #endif |
| .endm |
| |
| .macro apply_at_speculative_wa |
| #if ERRATA_SPECULATIVE_AT |
| /* |
| * Explicitly save x30 so as to free up a register and to enable |
| * branching and also, save x29 which will be used in the called |
| * function |
| */ |
| stp x29, x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X29] |
| bl save_and_update_ptw_el1_sys_regs |
| ldp x29, x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X29] |
| #endif |
| .endm |
| |
| .macro restore_ptw_el1_sys_regs |
| #if ERRATA_SPECULATIVE_AT |
| /* ----------------------------------------------------------- |
| * In case of ERRATA_SPECULATIVE_AT, must follow below order |
| * to ensure that page table walk is not enabled until |
| * restoration of all EL1 system registers. TCR_EL1 register |
| * should be updated at the end which restores previous page |
| * table walk setting of stage1 i.e.(TCR_EL1.EPDx) bits. ISB |
| * ensures that CPU does below steps in order. |
| * |
| * 1. Ensure all other system registers are written before |
| * updating SCTLR_EL1 using ISB. |
| * 2. Restore SCTLR_EL1 register. |
| * 3. Ensure SCTLR_EL1 written successfully using ISB. |
| * 4. Restore TCR_EL1 register. |
| * ----------------------------------------------------------- |
| */ |
| isb |
| ldp x28, x29, [sp, #CTX_EL1_SYSREGS_OFFSET + CTX_SCTLR_EL1] |
| msr sctlr_el1, x28 |
| isb |
| msr tcr_el1, x29 |
| #endif |
| .endm |
| |
| #endif /* EL2_COMMON_MACROS_S */ |
