1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * X86 specific ACPICA environments and implementation 4 * 5 * Copyright (C) 2014, Intel Corporation 6 * Author: Lv Zheng <lv.zheng@intel.com> 7 */ 8 9 #ifndef _ASM_X86_ACENV_H 10 #define _ASM_X86_ACENV_H 11 12 #include <asm/special_insns.h> 13 14 /* Asm macros */ 15 16 /* 17 * ACPI_FLUSH_CPU_CACHE() flushes caches on entering sleep states. 18 * It is required to prevent data loss. 19 * 20 * While running inside virtual machine, the kernel can bypass cache flushing. 21 * Changing sleep state in a virtual machine doesn't affect the host system 22 * sleep state and cannot lead to data loss. 23 */ 24 #define ACPI_FLUSH_CPU_CACHE() \ 25 do { \ 26 if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) \ 27 wbinvd(); \ 28 } while (0) 29 30 int __acpi_acquire_global_lock(unsigned int *lock); 31 int __acpi_release_global_lock(unsigned int *lock); 32 33 #define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \ 34 ((Acq) = __acpi_acquire_global_lock(&facs->global_lock)) 35 36 #define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \ 37 ((Acq) = __acpi_release_global_lock(&facs->global_lock)) 38 39 /* 40 * Math helper asm macros 41 */ 42 #define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \ 43 asm("divl %2;" \ 44 : "=a"(q32), "=d"(r32) \ 45 : "r"(d32), \ 46 "0"(n_lo), "1"(n_hi)) 47 48 #define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \ 49 asm("shrl $1,%2 ;" \ 50 "rcrl $1,%3;" \ 51 : "=r"(n_hi), "=r"(n_lo) \ 52 : "0"(n_hi), "1"(n_lo)) 53 54 #endif /* _ASM_X86_ACENV_H */ 55