/* * cppc_msr.c:  MSR Interface for CPPC * Copyright (c) 2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for * more details. * */ #include <acpi/cppc_acpi.h>#include <asm/msr.h> /* Refer to drivers/acpi/cppc_acpi.c for the description of functions */ bool cpc_ffh_supported(void){	return true;} int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val){	int err; 	err = rdmsrl_safe_on_cpu(cpunum, reg->address, val);	if (!err) {		u64 mask = GENMASK_ULL(reg->bit_offset + reg->bit_width - 1,				       reg->bit_offset); 		*val &= mask;		*val >>= reg->bit_offset;	}	return err;} int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val){	u64 rd_val;	int err; 	err = rdmsrl_safe_on_cpu(cpunum, reg->address, &rd_val);	if (!err) {		u64 mask = GENMASK_ULL(reg->bit_offset + reg->bit_width - 1,				       reg->bit_offset); 		val <<= reg->bit_offset;		val &= mask;		rd_val &= ~mask;		rd_val |= val;		err = wrmsrl_safe_on_cpu(cpunum, reg->address, rd_val);	}	return err;}