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// Copyright 2019 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build amd64
// +build amd64
package cpuid
import "context"
// Static is a static CPUID function.
//
// +stateify savable
type Static map[In]Out
// Fixed converts the FeatureSet to a fixed set.
func (fs FeatureSet) Fixed() FeatureSet {
return fs.ToStatic().ToFeatureSet()
}
// ToStatic converts a FeatureSet to a Static function.
//
// You can create a new static feature set as:
//
// fs := otherFeatureSet.ToStatic().ToFeatureSet()
func (fs FeatureSet) ToStatic() Static {
s := make(Static)
// Save all allowed top-level functions.
for fn, allowed := range allowedBasicFunctions {
if allowed {
in := In{Eax: uint32(fn)}
s[in] = fs.Query(in)
}
}
// Save all allowed extended functions.
for fn, allowed := range allowedExtendedFunctions {
if allowed {
in := In{Eax: uint32(fn) + uint32(extendedStart)}
s[in] = fs.Query(in)
}
}
// Save all features (may be redundant).
for feature := range allFeatures {
feature.set(s, fs.HasFeature(feature))
}
// Processor Extended State Enumeration.
for i := uint32(0); i < xSaveInfoNumLeaves; i++ {
in := In{Eax: uint32(xSaveInfo), Ecx: i}
s[in] = fs.Query(in)
}
// Save all cache information.
out := fs.Query(In{Eax: uint32(featureInfo)})
for i := uint32(0); i < out.Ecx; i++ {
in := In{Eax: uint32(intelDeterministicCacheParams), Ecx: i}
out := fs.Query(in)
s[in] = out
if CacheType(out.Eax&0xf) == cacheNull {
break
}
}
return s
}
// ToFeatureSet converts a static specification to a FeatureSet.
//
// This overloads some local values, where required.
func (s Static) ToFeatureSet() FeatureSet {
// Make a copy.
ns := make(Static)
for k, v := range s {
ns[k] = v
}
ns.normalize()
return FeatureSet{ns, hwCap{}}
}
// afterLoad calls normalize.
func (s Static) afterLoad(context.Context) {
s.normalize()
}
// normalize normalizes FPU sizes.
func (s Static) normalize() {
// Override local FPU sizes, which must be fixed.
fs := FeatureSet{s, hwCap{}}
if fs.HasFeature(X86FeatureXSAVE) {
in := In{Eax: uint32(xSaveInfo)}
out := s[in]
out.Ecx = maxXsaveSize
out.Ebx = xsaveSize
s[in] = out
}
}
// Add adds a feature.
func (s Static) Add(feature Feature) Static {
feature.set(s, true)
return s
}
// Remove removes a feature.
func (s Static) Remove(feature Feature) Static {
feature.set(s, false)
return s
}
// Set implements ChangeableSet.Set.
func (s Static) Set(in In, out Out) {
s[in] = out
}
// Query implements Function.Query.
func (s Static) Query(in In) Out {
in.normalize()
return s[in]
}
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