src/lib/assembly/platform_configuration/src/subsystems/kernel.rs

// Copyright 2023 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use crate::subsystems::prelude::*;
use assembly_config_schema::platform_config::kernel_config::PlatformKernelConfig;

pub(crate) struct KernelSubsystem;

impl DefineSubsystemConfiguration<PlatformKernelConfig> for KernelSubsystem {
    fn define_configuration(
        context: &ConfigurationContext<'_>,
        kernel_config: &PlatformKernelConfig,
        builder: &mut dyn ConfigurationBuilder,
    ) -> anyhow::Result<()> {
        if kernel_config.lru_memory_compression && !kernel_config.memory_compression {
            anyhow::bail!("'lru_memory_compression' can only be enabled with 'memory_compression'");
        }
        if kernel_config.memory_compression {
            builder.platform_bundle("kernel_anonymous_memory_compression");
        }
        if kernel_config.lru_memory_compression {
            builder.platform_bundle("kernel_anonymous_memory_compression_eager_lru");
        }
        if kernel_config.continuous_eviction {
            builder.platform_bundle("kernel_evict_continuous");
        }

        // If the board supports the PMM checker, and this is an eng build-type
        // build, enable the pmm checker.
        if context.board_info.provides_feature("fuchsia::pmm_checker")
            && context.build_type == &BuildType::Eng
        {
            builder.platform_bundle("kernel_pmm_checker_enabled");
        }

        if context.board_info.kernel.contiguous_physical_pages {
            builder.platform_bundle("kernel_contiguous_physical_pages");
        }

        Ok(())
    }
}