| /* |
| * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * Neither the name of ARM nor the names of its contributors may be used |
| * to endorse or promote products derived from this software without specific |
| * prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <bl_common.h> |
| #include <context.h> |
| #include <el3_common_macros.S> |
| #include <runtime_svc.h> |
| #include <smcc_helpers.h> |
| #include <smcc_macros.S> |
| #include <xlat_tables.h> |
| |
| .globl sp_min_vector_table |
| .globl sp_min_entrypoint |
| .globl sp_min_warm_entrypoint |
| |
| |
| vector_base sp_min_vector_table |
| b sp_min_entrypoint |
| b plat_panic_handler /* Undef */ |
| b handle_smc /* Syscall */ |
| b plat_panic_handler /* Prefetch abort */ |
| b plat_panic_handler /* Data abort */ |
| b plat_panic_handler /* Reserved */ |
| b plat_panic_handler /* IRQ */ |
| b plat_panic_handler /* FIQ */ |
| |
| |
| /* |
| * The Cold boot/Reset entrypoint for SP_MIN |
| */ |
| func sp_min_entrypoint |
| #if !RESET_TO_SP_MIN |
| /* --------------------------------------------------------------- |
| * Preceding bootloader has populated r0 with a pointer to a |
| * 'bl_params_t' structure & r1 with a pointer to platform |
| * specific structure |
| * --------------------------------------------------------------- |
| */ |
| mov r11, r0 |
| mov r12, r1 |
| |
| /* --------------------------------------------------------------------- |
| * For !RESET_TO_SP_MIN systems, only the primary CPU ever reaches |
| * sp_min_entrypoint() during the cold boot flow, so the cold/warm boot |
| * and primary/secondary CPU logic should not be executed in this case. |
| * |
| * Also, assume that the previous bootloader has already set up the CPU |
| * endianness and has initialised the memory. |
| * --------------------------------------------------------------------- |
| */ |
| el3_entrypoint_common \ |
| _set_endian=0 \ |
| _warm_boot_mailbox=0 \ |
| _secondary_cold_boot=0 \ |
| _init_memory=0 \ |
| _init_c_runtime=1 \ |
| _exception_vectors=sp_min_vector_table |
| |
| /* --------------------------------------------------------------------- |
| * Relay the previous bootloader's arguments to the platform layer |
| * --------------------------------------------------------------------- |
| */ |
| mov r0, r11 |
| mov r1, r12 |
| #else |
| /* --------------------------------------------------------------------- |
| * For RESET_TO_SP_MIN systems which have a programmable reset address, |
| * sp_min_entrypoint() is executed only on the cold boot path so we can |
| * skip the warm boot mailbox mechanism. |
| * --------------------------------------------------------------------- |
| */ |
| el3_entrypoint_common \ |
| _set_endian=1 \ |
| _warm_boot_mailbox=!PROGRAMMABLE_RESET_ADDRESS \ |
| _secondary_cold_boot=!COLD_BOOT_SINGLE_CPU \ |
| _init_memory=1 \ |
| _init_c_runtime=1 \ |
| _exception_vectors=sp_min_vector_table |
| |
| /* --------------------------------------------------------------------- |
| * For RESET_TO_SP_MIN systems, BL32 (SP_MIN) is the first bootloader |
| * to run so there's no argument to relay from a previous bootloader. |
| * Zero the arguments passed to the platform layer to reflect that. |
| * --------------------------------------------------------------------- |
| */ |
| mov r0, #0 |
| mov r1, #0 |
| #endif /* RESET_TO_SP_MIN */ |
| |
| bl sp_min_early_platform_setup |
| bl sp_min_plat_arch_setup |
| |
| /* Jump to the main function */ |
| bl sp_min_main |
| |
| /* ------------------------------------------------------------- |
| * Clean the .data & .bss sections to main memory. This ensures |
| * that any global data which was initialised by the primary CPU |
| * is visible to secondary CPUs before they enable their data |
| * caches and participate in coherency. |
| * ------------------------------------------------------------- |
| */ |
| ldr r0, =__DATA_START__ |
| ldr r1, =__DATA_END__ |
| sub r1, r1, r0 |
| bl clean_dcache_range |
| |
| ldr r0, =__BSS_START__ |
| ldr r1, =__BSS_END__ |
| sub r1, r1, r0 |
| bl clean_dcache_range |
| |
| /* Program the registers in cpu_context and exit monitor mode */ |
| mov r0, #NON_SECURE |
| bl cm_get_context |
| |
| /* Restore the SCR */ |
| ldr r2, [r0, #CTX_REGS_OFFSET + CTX_SCR] |
| stcopr r2, SCR |
| isb |
| |
| /* Restore the SCTLR */ |
| ldr r2, [r0, #CTX_REGS_OFFSET + CTX_NS_SCTLR] |
| stcopr r2, SCTLR |
| |
| bl smc_get_next_ctx |
| /* The other cpu_context registers have been copied to smc context */ |
| b sp_min_exit |
| endfunc sp_min_entrypoint |
| |
| |
| /* |
| * SMC handling function for SP_MIN. |
| */ |
| func handle_smc |
| smcc_save_gp_mode_regs |
| |
| /* r0 points to smc_context */ |
| mov r2, r0 /* handle */ |
| ldcopr r0, SCR |
| |
| /* Save SCR in stack */ |
| push {r0} |
| and r3, r0, #SCR_NS_BIT /* flags */ |
| |
| /* Switch to Secure Mode*/ |
| bic r0, #SCR_NS_BIT |
| stcopr r0, SCR |
| isb |
| ldr r0, [r2, #SMC_CTX_GPREG_R0] /* smc_fid */ |
| /* Check whether an SMC64 is issued */ |
| tst r0, #(FUNCID_CC_MASK << FUNCID_CC_SHIFT) |
| beq 1f /* SMC32 is detected */ |
| mov r0, #SMC_UNK |
| str r0, [r2, #SMC_CTX_GPREG_R0] |
| mov r0, r2 |
| b 2f /* Skip handling the SMC */ |
| 1: |
| mov r1, #0 /* cookie */ |
| bl handle_runtime_svc |
| 2: |
| /* r0 points to smc context */ |
| |
| /* Restore SCR from stack */ |
| pop {r1} |
| stcopr r1, SCR |
| isb |
| |
| b sp_min_exit |
| endfunc handle_smc |
| |
| |
| /* |
| * The Warm boot entrypoint for SP_MIN. |
| */ |
| func sp_min_warm_entrypoint |
| /* |
| * On the warm boot path, most of the EL3 initialisations performed by |
| * 'el3_entrypoint_common' must be skipped: |
| * |
| * - Only when the platform bypasses the BL1/BL32 (SP_MIN) entrypoint by |
| * programming the reset address do we need to set the CPU endianness. |
| * In other cases, we assume this has been taken care by the |
| * entrypoint code. |
| * |
| * - No need to determine the type of boot, we know it is a warm boot. |
| * |
| * - Do not try to distinguish between primary and secondary CPUs, this |
| * notion only exists for a cold boot. |
| * |
| * - No need to initialise the memory or the C runtime environment, |
| * it has been done once and for all on the cold boot path. |
| */ |
| el3_entrypoint_common \ |
| _set_endian=PROGRAMMABLE_RESET_ADDRESS \ |
| _warm_boot_mailbox=0 \ |
| _secondary_cold_boot=0 \ |
| _init_memory=0 \ |
| _init_c_runtime=0 \ |
| _exception_vectors=sp_min_vector_table |
| |
| /* -------------------------------------------- |
| * Enable the MMU with the DCache disabled. It |
| * is safe to use stacks allocated in normal |
| * memory as a result. All memory accesses are |
| * marked nGnRnE when the MMU is disabled. So |
| * all the stack writes will make it to memory. |
| * All memory accesses are marked Non-cacheable |
| * when the MMU is enabled but D$ is disabled. |
| * So used stack memory is guaranteed to be |
| * visible immediately after the MMU is enabled |
| * Enabling the DCache at the same time as the |
| * MMU can lead to speculatively fetched and |
| * possibly stale stack memory being read from |
| * other caches. This can lead to coherency |
| * issues. |
| * -------------------------------------------- |
| */ |
| mov r0, #DISABLE_DCACHE |
| bl bl32_plat_enable_mmu |
| |
| bl sp_min_warm_boot |
| |
| /* Program the registers in cpu_context and exit monitor mode */ |
| mov r0, #NON_SECURE |
| bl cm_get_context |
| |
| /* Restore the SCR */ |
| ldr r2, [r0, #CTX_REGS_OFFSET + CTX_SCR] |
| stcopr r2, SCR |
| isb |
| |
| /* Restore the SCTLR */ |
| ldr r2, [r0, #CTX_REGS_OFFSET + CTX_NS_SCTLR] |
| stcopr r2, SCTLR |
| |
| bl smc_get_next_ctx |
| |
| /* The other cpu_context registers have been copied to smc context */ |
| b sp_min_exit |
| endfunc sp_min_warm_entrypoint |
| |
| /* |
| * The function to restore the registers from SMC context and return |
| * to the mode restored to SPSR. |
| * |
| * Arguments : r0 must point to the SMC context to restore from. |
| */ |
| func sp_min_exit |
| smcc_restore_gp_mode_regs |
| eret |
| endfunc sp_min_exit |