| /* |
| * arch/aarch64/include/asm/psci.h |
| * |
| * Copyright (C) 2015 ARM Limited. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE.txt file. |
| */ |
| #ifndef __ASM_AARCH64_PSCI_H |
| #define __ASM_AARCH64_PSCI_H |
| |
| #ifndef __ASSEMBLY__ |
| |
| static inline int psci_store_address(unsigned long address, |
| unsigned long *branch_entry) |
| { |
| unsigned long ret; |
| |
| asm volatile ( |
| "1:\n" |
| "ldxr %0, [%2]\n" |
| "subs %0, %0, %3\n" |
| "b.ne 2f\n" |
| "stxr %w0, %1, [%2]\n" |
| "cbnz %w0, 1b\n" |
| "2:\n" |
| : "=&r" (ret) |
| : "r" (address), "r" (branch_entry), "J" (PSCI_ADDR_INVALID) |
| : "cc"); |
| |
| if (ret != 0) |
| /* ret value comes from subs */ |
| return PSCI_RET_ALREADY_ON; |
| |
| return PSCI_RET_SUCCESS; |
| } |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif |
