41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
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// Copyright 2017 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
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#define CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
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#include <assert.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "cpu_features_macros.h"
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CPU_FEATURES_START_CPP_NAMESPACE
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inline static bool IsBitSet(uint32_t reg, uint32_t bit) {
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return (reg >> bit) & 0x1;
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}
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inline static uint32_t ExtractBitRange(uint32_t reg, uint32_t msb,
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uint32_t lsb) {
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const uint64_t bits = msb - lsb + 1ULL;
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const uint64_t mask = (1ULL << bits) - 1ULL;
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assert(msb >= lsb);
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return (reg >> lsb) & mask;
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}
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CPU_FEATURES_END_CPP_NAMESPACE
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#endif // CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_
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