| /* |
| * Copyright (c) 2014-2025, Arm Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <asm_macros.S> |
| #include <assert_macros.S> |
| #include <cpu_macros.S> |
| #include <lib/psci/psci.h> |
| #include <platform_def.h> |
| |
| .globl psci_do_pwrdown_cache_maintenance |
| .globl psci_do_pwrup_cache_maintenance |
| |
| /* ----------------------------------------------------------------------- |
| * void psci_do_pwrdown_cache_maintenance(void); |
| * |
| * This function turns off data caches and also ensures that stack memory |
| * is correctly flushed out to avoid coherency issues due to a change in |
| * its memory attributes. |
| * ----------------------------------------------------------------------- |
| */ |
| func psci_do_pwrdown_cache_maintenance |
| stp x29, x30, [sp,#-16]! |
| stp x19, x20, [sp,#-16]! |
| |
| /* Disable L1 data cache and unified L2 cache */ |
| mrs x1, sctlr_el3 |
| bic x1, x1, #SCTLR_C_BIT |
| msr sctlr_el3, x1 |
| isb |
| |
| /* --------------------------------------------- |
| * Do stack maintenance by flushing the used |
| * stack to the main memory and invalidating the |
| * remainder. |
| * --------------------------------------------- |
| */ |
| bl plat_get_my_stack |
| |
| /* --------------------------------------------- |
| * Calculate and store the size of the used |
| * stack memory in x1. |
| * --------------------------------------------- |
| */ |
| mov x19, x0 |
| mov x1, sp |
| sub x1, x0, x1 |
| mov x0, sp |
| bl flush_dcache_range |
| |
| /* --------------------------------------------- |
| * Calculate and store the size of the unused |
| * stack memory in x1. Calculate and store the |
| * stack base address in x0. |
| * --------------------------------------------- |
| */ |
| sub x0, x19, #PLATFORM_STACK_SIZE |
| sub x1, sp, x0 |
| bl inv_dcache_range |
| |
| ldp x19, x20, [sp], #16 |
| ldp x29, x30, [sp], #16 |
| ret |
| endfunc psci_do_pwrdown_cache_maintenance |
| |
| |
| /* ----------------------------------------------------------------------- |
| * void psci_do_pwrup_cache_maintenance(void); |
| * |
| * This function performs cache maintenance after this cpu is powered up. |
| * Currently, this involves managing the used stack memory before turning |
| * on the data cache. |
| * ----------------------------------------------------------------------- |
| */ |
| func psci_do_pwrup_cache_maintenance |
| stp x29, x30, [sp,#-16]! |
| |
| /* --------------------------------------------- |
| * Ensure any inflight stack writes have made it |
| * to main memory. |
| * --------------------------------------------- |
| */ |
| dmb st |
| |
| /* --------------------------------------------- |
| * Calculate and store the size of the used |
| * stack memory in x1. Calculate and store the |
| * stack base address in x0. |
| * --------------------------------------------- |
| */ |
| bl plat_get_my_stack |
| mov x1, sp |
| sub x1, x0, x1 |
| mov x0, sp |
| bl inv_dcache_range |
| |
| /* --------------------------------------------- |
| * Enable the data cache. |
| * --------------------------------------------- |
| */ |
| mrs x0, sctlr_el3 |
| orr x0, x0, #SCTLR_C_BIT |
| msr sctlr_el3, x0 |
| isb |
| |
| ldp x29, x30, [sp], #16 |
| ret |
| endfunc psci_do_pwrup_cache_maintenance |