1/* 2 * Copyright (c) 2014-2020, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7#include <arch.h> 8#include <asm_macros.S> 9#include <assert_macros.S> 10#include <platform_def.h> 11 12 .local platform_normal_stacks 13 .weak plat_get_my_stack 14 .weak plat_set_my_stack 15 16 /* --------------------------------------------------------------------- 17 * When the compatility layer is disabled, the platform APIs 18 * plat_get_my_stack() and plat_set_my_stack() are supported by the 19 * platform and the previous APIs platform_get_stack() and 20 * platform_set_stack() are defined in terms of new APIs making use of 21 * the fact that they are only ever invoked for the current CPU. This 22 * is to enable components of Trusted Firmware like SPDs using the old 23 * platform APIs to continue to work. 24 * -------------------------------------------------------------------- 25 */ 26 27 /* ----------------------------------------------------- 28 * uintptr_t plat_get_my_stack () 29 * 30 * For the current CPU, this function returns the stack 31 * pointer for a stack allocated in device memory. 32 * ----------------------------------------------------- 33 */ 34func plat_get_my_stack 35#if (defined(IMAGE_BL31) && RECLAIM_INIT_CODE) 36#if (PLATFORM_CORE_COUNT == 1) 37 /* Single CPU */ 38 adrp x0, __PRIMARY_STACK__ 39 add x0, x0, :lo12:__PRIMARY_STACK__ 40 ret 41#else 42 mov x10, x30 43 bl plat_my_core_pos 44 cbnz x0, 2f 45 46 /* Primary CPU */ 47 adrp x0, __PRIMARY_STACK__ 48 add x0, x0, :lo12:__PRIMARY_STACK__ 49 ret x10 50 51 /* Secondary CPU */ 522: sub x0, x0, #(PLATFORM_CORE_COUNT - 1) 53 adrp x1, __STACKS_END__ 54 adrp x2, __STACK_SIZE__ 55 add x1, x1, :lo12:__STACKS_END__ 56 add x2, x2, :lo12:__STACK_SIZE__ 57 58 madd x0, x0, x2, x1 59 bic x0, x0, #(CACHE_WRITEBACK_GRANULE - 1) 60 ret x10 61#endif 62 .word platform_normal_stacks 63 64#else /* !(IMAGE_BL31 && RECLAIM_INIT_CODE) */ 65 mov x10, x30 66 get_my_mp_stack platform_normal_stacks, PLATFORM_STACK_SIZE 67 ret x10 68 69#endif /* IMAGE_BL31 && RECLAIM_INIT_CODE */ 70endfunc plat_get_my_stack 71 72 /* ----------------------------------------------------- 73 * void plat_set_my_stack () 74 * 75 * For the current CPU, this function sets the stack 76 * pointer to a stack allocated in normal memory. 77 * ----------------------------------------------------- 78 */ 79func plat_set_my_stack 80 mov x9, x30 81 bl plat_get_my_stack 82 mov sp, x0 83 ret x9 84endfunc plat_set_my_stack 85 86 /* ----------------------------------------------------- 87 * Per-CPU stacks in normal memory. Each CPU gets a 88 * stack of PLATFORM_STACK_SIZE bytes. 89 * ----------------------------------------------------- 90 */ 91declare_stack platform_normal_stacks, tzfw_normal_stacks, \ 92 PLATFORM_STACK_SIZE, PLATFORM_CORE_COUNT, \ 93 CACHE_WRITEBACK_GRANULE 94