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// Copyright (C) 2021 The Android Open Source Project
//
// 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.
package kernel
import (
"fmt"
"path/filepath"
"strings"
"android/soong/android"
_ "android/soong/cc/config"
"github.com/google/blueprint"
"github.com/google/blueprint/proptools"
)
func init() {
pctx.Import("android/soong/cc/config")
registerKernelBuildComponents(android.InitRegistrationContext)
}
func registerKernelBuildComponents(ctx android.RegistrationContext) {
ctx.RegisterModuleType("prebuilt_kernel_modules", prebuiltKernelModulesFactory)
}
type prebuiltKernelModules struct {
android.ModuleBase
properties prebuiltKernelModulesProperties
installDir android.InstallPath
}
type prebuiltKernelModulesProperties struct {
// List or filegroup of prebuilt kernel module files. Should have .ko suffix.
Srcs []string `android:"path,arch_variant"`
// Kernel version that these modules are for. Kernel modules are installed to
// /lib/modules/<kernel_version> directory in the corresponding partition. Default is "".
Kernel_version *string
}
// prebuilt_kernel_modules installs a set of prebuilt kernel module files to the correct directory.
// In addition, this module builds modules.load, modules.dep, modules.softdep and modules.alias
// using depmod and installs them as well.
func prebuiltKernelModulesFactory() android.Module {
module := &prebuiltKernelModules{}
module.AddProperties(&module.properties)
android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)
return module
}
func (pkm *prebuiltKernelModules) KernelVersion() string {
return proptools.StringDefault(pkm.properties.Kernel_version, "")
}
func (pkm *prebuiltKernelModules) DepsMutator(ctx android.BottomUpMutatorContext) {
// do nothing
}
func (pkm *prebuiltKernelModules) GenerateAndroidBuildActions(ctx android.ModuleContext) {
modules := android.PathsForModuleSrc(ctx, pkm.properties.Srcs)
depmodOut := runDepmod(ctx, modules)
strippedModules := stripDebugSymbols(ctx, modules)
installDir := android.PathForModuleInstall(ctx, "lib", "modules")
if pkm.KernelVersion() != "" {
installDir = installDir.Join(ctx, pkm.KernelVersion())
}
for _, m := range strippedModules {
ctx.InstallFile(installDir, filepath.Base(m.String()), m)
}
ctx.InstallFile(installDir, "modules.load", depmodOut.modulesLoad)
ctx.InstallFile(installDir, "modules.dep", depmodOut.modulesDep)
ctx.InstallFile(installDir, "modules.softdep", depmodOut.modulesSoftdep)
ctx.InstallFile(installDir, "modules.alias", depmodOut.modulesAlias)
}
var (
pctx = android.NewPackageContext("android/soong/kernel")
stripRule = pctx.AndroidStaticRule("strip",
blueprint.RuleParams{
Command: "$stripCmd -o $out --strip-debug $in",
CommandDeps: []string{"$stripCmd"},
}, "stripCmd")
)
func stripDebugSymbols(ctx android.ModuleContext, modules android.Paths) android.OutputPaths {
dir := android.PathForModuleOut(ctx, "stripped").OutputPath
var outputs android.OutputPaths
for _, m := range modules {
stripped := dir.Join(ctx, filepath.Base(m.String()))
ctx.Build(pctx, android.BuildParams{
Rule: stripRule,
Input: m,
Output: stripped,
Args: map[string]string{
"stripCmd": "${config.ClangBin}/llvm-strip",
},
})
outputs = append(outputs, stripped)
}
return outputs
}
type depmodOutputs struct {
modulesLoad android.OutputPath
modulesDep android.OutputPath
modulesSoftdep android.OutputPath
modulesAlias android.OutputPath
}
func runDepmod(ctx android.ModuleContext, modules android.Paths) depmodOutputs {
baseDir := android.PathForModuleOut(ctx, "depmod").OutputPath
fakeVer := "0.0" // depmod demands this anyway
modulesDir := baseDir.Join(ctx, "lib", "modules", fakeVer)
builder := android.NewRuleBuilder(pctx, ctx)
// Copy the module files to a temporary dir
builder.Command().Text("rm").Flag("-rf").Text(modulesDir.String())
builder.Command().Text("mkdir").Flag("-p").Text(modulesDir.String())
for _, m := range modules {
builder.Command().Text("cp").Input(m).Text(modulesDir.String())
}
// Enumerate modules to load
modulesLoad := modulesDir.Join(ctx, "modules.load")
var basenames []string
for _, m := range modules {
basenames = append(basenames, filepath.Base(m.String()))
}
builder.Command().
Text("echo").Flag("\"" + strings.Join(basenames, " ") + "\"").
Text("|").Text("tr").Flag("\" \"").Flag("\"\\n\"").
Text(">").Output(modulesLoad)
// Run depmod to build modules.dep/softdep/alias files
modulesDep := modulesDir.Join(ctx, "modules.dep")
modulesSoftdep := modulesDir.Join(ctx, "modules.softdep")
modulesAlias := modulesDir.Join(ctx, "modules.alias")
builder.Command().
BuiltTool("depmod").
FlagWithArg("-b ", baseDir.String()).
Text(fakeVer).
ImplicitOutput(modulesDep).
ImplicitOutput(modulesSoftdep).
ImplicitOutput(modulesAlias)
builder.Build("depmod", fmt.Sprintf("depmod %s", ctx.ModuleName()))
return depmodOutputs{modulesLoad, modulesDep, modulesSoftdep, modulesAlias}
}
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