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// SPDX-License-Identifier: GPL-2.0-only /* * cppc_msr.c: MSR Interface for CPPC * Copyright (c) 2016, Intel Corporation. */ #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; }
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