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Diffstat (limited to '')
| -rw-r--r-- | services/std_svc/rmmd/trp/trp_entry.S | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/services/std_svc/rmmd/trp/trp_entry.S b/services/std_svc/rmmd/trp/trp_entry.S new file mode 100644 index 0000000..47c1df1 --- /dev/null +++ b/services/std_svc/rmmd/trp/trp_entry.S @@ -0,0 +1,121 @@ +/* + * Copyright (c) 2021-2022, Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <asm_macros.S> +#include <services/rmmd_svc.h> + +#include <platform_def.h> +#include "trp_private.h" + +.global trp_head +.global trp_smc + +.section ".head.text", "ax" + + /* --------------------------------------------- + * 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, #TRP_ARG6] + ldp x4, x5, [x0, #TRP_ARG4] + ldp x2, x3, [x0, #TRP_ARG2] + ldp x0, x1, [x0, #TRP_ARG0] + smc #0 + .endm + + /* --------------------------------------------- + * Entry point for TRP + * --------------------------------------------- + */ +trp_head: + /* + * Stash arguments from previous boot stage + */ + mov x20, x0 + mov x21, x1 + mov x22, x2 + mov x23, x3 + + /* + * Validate CPUId before allocating a stack. + */ + cmp x20, #PLATFORM_CORE_COUNT + b.lo 1f + + mov_imm x0, RMM_BOOT_COMPLETE + mov_imm x1, E_RMM_BOOT_CPU_ID_OUT_OF_RANGE + smc #0 + + /* EL3 should never return back here, so panic if it does */ + b trp_panic + +1: + bl plat_set_my_stack + + /* + * Find out whether this is a cold or warm boot + */ + ldr x1, cold_boot_flag + cbz x1, warm_boot + + /* + * Update cold boot flag to indicate cold boot is done + */ + adr x2, cold_boot_flag + str xzr, [x2] + + /* --------------------------------------------- + * Zero out BSS section + * --------------------------------------------- + */ + ldr x0, =__BSS_START__ + ldr x1, =__BSS_SIZE__ + bl zeromem + + mov x0, x20 + mov x1, x21 + mov x2, x22 + mov x3, x23 + bl trp_setup + bl trp_main +warm_boot: + mov_imm x0, RMM_BOOT_COMPLETE + mov x1, xzr /* RMM_BOOT_SUCCESS */ + smc #0 + b trp_handler + +trp_panic: + no_ret plat_panic_handler + + /* + * Flag to mark if it is a cold boot. + * 1: cold boot, 0: warmboot. + */ +.align 3 +cold_boot_flag: + .dword 1 + + /* --------------------------------------------- + * Direct SMC call to BL31 service provided by + * RMM Dispatcher + * --------------------------------------------- + */ +func trp_smc + restore_args_call_smc + ret +endfunc trp_smc + + /* --------------------------------------------- + * RMI call handler + * --------------------------------------------- + */ +func trp_handler + bl trp_rmi_handler + restore_args_call_smc + b trp_handler +endfunc trp_handler |