├── .gitignore
├── TinyLinux
    ├── TinyLinux.entitlements
    └── Command.swift
├── Makefile
├── LICENSE
├── README.md
└── TinyLinux.xcodeproj
    ├── xcshareddata
        └── xcschemes
        │   └── TinyLinux.xcscheme
    └── project.pbxproj


/.gitignore:
--------------------------------------------------------------------------------
1 | .DS_Store
2 | .build/
3 | project.xcworkspace/
4 | xcuserdata/
5 | 


--------------------------------------------------------------------------------
/TinyLinux/TinyLinux.entitlements:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
3 | <plist version="1.0">
4 | <dict>
5 | 	<key>com.apple.security.virtualization</key>
6 | 	<true/>
7 | </dict>
8 | </plist>
9 | 


--------------------------------------------------------------------------------
/Makefile:
--------------------------------------------------------------------------------
 1 | NAME = TinyLinux
 2 | 
 3 | BUILD_PATH = .build
 4 | 
 5 | XCODE_PROJECT_PATH = $(NAME).xcodeproj
 6 | XCODE_SCHEME = $(NAME)
 7 | XCODE_ARCHIVE_PATH = $(BUILD_PATH)/$(NAME).xcarchive
 8 | 
 9 | .PHONY: all
10 | all: build
11 | 
12 | .PHONY: claen
13 | clean:
14 | 	git clean -dfX
15 | 
16 | .PHONY: build
17 | build:
18 | 	xcodebuild \
19 | 		-project "$(XCODE_PROJECT_PATH)" \
20 | 		-scheme "$(XCODE_SCHEME)" \
21 | 		-derivedDataPath "$(BUILD_PATH)" \
22 | 		-archivePath "$(XCODE_ARCHIVE_PATH)" \
23 | 		archive
24 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | Copyright (c) 2021 Yoshimasa Niwa
 2 | 
 3 | Permission is hereby granted, free of charge, to any person obtaining
 4 | a copy of this software and associated documentation files (the
 5 | "Software"), to deal in the Software without restriction, including
 6 | without limitation the rights to use, copy, modify, merge, publish,
 7 | distribute, sublicense, and/or sell copies of the Software, and to
 8 | permit persons to whom the Software is furnished to do so, subject to
 9 | the following conditions:
10 | 
11 | The above copyright notice and this permission notice shall be
12 | included in all copies or substantial portions of the Software.
13 | 
14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
15 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
17 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
18 | LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
19 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
20 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | TinyLinux
 2 | =========
 3 | 
 4 | Really a tiny minimum implementation of [Virtualization framework](https://developer.apple.com/documentation/virtualization) to boot Linux.
 5 | 
 6 | Prerequisites
 7 | -------------
 8 | 
 9 | - macOS Big Sur or later
10 | - Xcode 12.3 or later
11 | 
12 | Usage
13 | -----
14 | 
15 | Prepare Linux kernel and ramdisk file that works on each Intel or Apple Silicon architecture.
16 | 
17 | For example, if you're using Apple Silicon Mac and booting Ubuntu Server for ARM, follow the next steps.
18 | 
19 | First, clone this repository.
20 | 
21 | In the repository directory, download an iso file from [Ubuntu Server for ARM](https://ubuntu.com/download/server/arm). The following URL and file name of the iso file includes version may vary, so please check it at the download page.
22 | 
23 | ```sh
24 | curl -O 'https://cdimage.ubuntu.com/releases/20.04/release/ubuntu-20.04.3-live-server-arm64.iso'
25 | ```
26 | 
27 | Then, mount downloaded iso file. You need to use `mount` instead of double-click the iso file. Extract Linux kernel (and ungzip,) and ramdisk.
28 | 
29 | ```sh
30 | # Create a mounting point.
31 | mkdir -p ubuntu
32 | # Attach and mount the iso file
33 | hdiutil attach -nomount ubuntu-20.04.3-live-server-arm64.iso
34 | mount -t cd9660 /dev/disk4 ubuntu # disk4 may vary depends on your environment, see output of `hdiutil`
35 | # Copy linux kernel and ungzip
36 | cp ubuntu/casper/vmlinuz vmlinux.gz
37 | gzip -d vmlinux.gz
38 | # Copy ramdisk
39 | cp ubuntu/casper/initrd ./
40 | # Unmount and detach the iso file
41 | umount ubuntu
42 | hdiutil detach disk4 # Same here.
43 | # Remove the mounting point.
44 | rm -rf ubuntu
45 | ```
46 | 
47 | Build TinyLinux then boot.
48 | 
49 | ```sh
50 | # Build TinyLinux
51 | make
52 | # Boot Linux
53 | .build/TinyLinux.xcarchive/Products/usr/local/bin/TinyLinux \
54 |   --vmlinux vmlinux \
55 |   --initrd initrd \
56 |   --commandline "console=hvc0 root=/dev/vda1" \
57 |   --image ubuntu-20.04.3-live-server-arm64.iso
58 | ```
59 | 
60 | If you're using Intel Mac, you can use Ubuntu Desktop iso image and follow same steps as above for Apple Silicon Mac.
61 | It is not necessary to run `gzip -d` to ungzip `vmlinuz` but you can use that bzImage file directly for `--vmlinux` argument.
62 | 
63 | ### Serial device
64 | 
65 | TinyLinux connects standard input and output to the serial device.
66 | To make it works on the terminal emulator, you may need to disable the line discipline used for the current terminal emulator
67 | by using `stty raw` prior to use TinyLinux and restore state after using it.
68 | 
69 | For example, make a following shell script and use it instead.
70 | 
71 | ```sh
72 | #!/bin/sh
73 | # Save current state
74 | save_state=$(stty -g)
75 | # Make it raw
76 | stty raw
77 | # Boot Linux
78 | .build/TinyLinux.xcarchive/Products/usr/local/bin/TinyLinux ...
79 | # Restore original state
80 | stty "$save_state"
81 | ```
82 | 
83 | See `stty(3)` as well.
84 | 


--------------------------------------------------------------------------------
/TinyLinux/Command.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  Command.swift
 3 | //  TinyLinux
 4 | //
 5 | //  Created by Yoshimasa Niwa on 1/12/21.
 6 | //
 7 | 
 8 | import ArgumentParser
 9 | import Foundation
10 | import Virtualization
11 | 
12 | @main
13 | struct Command: ParsableCommand {
14 |     @Option(help: "path to ungziped linux kernel.")
15 |     var vmlinux: String
16 | 
17 |     @Option(help: "path to ramdisk.")
18 |     var initrd: String?
19 | 
20 |     @Option(help: "kernel command-line parameters")
21 |     var commandline: String = "console=hvc0"
22 | 
23 |     @Option(help: "number of CPUs.")
24 |     var cpuCount: Int = 1
25 | 
26 |     @Option(help: "memory size in megabyte")
27 |     var memorySize: Int = 512
28 | 
29 |     @Option(help: "path to disk image")
30 |     var image: [String] = []
31 | 
32 |     mutating func run() throws {
33 |         let bootLoader = VZLinuxBootLoader(kernelURL: URL(fileURLWithPath: vmlinux))
34 |         if let initrd = initrd {
35 |             bootLoader.initialRamdiskURL = URL(fileURLWithPath: initrd)
36 |         }
37 |         bootLoader.commandLine = commandline
38 | 
39 |         let serialPort = VZVirtioConsoleDeviceSerialPortConfiguration()
40 |         serialPort.attachment = VZFileHandleSerialPortAttachment(
41 |             fileHandleForReading: FileHandle.standardInput,
42 |             fileHandleForWriting: FileHandle.standardOutput
43 |         )
44 | 
45 |         let entropyDevice = VZVirtioEntropyDeviceConfiguration()
46 |         let memoryBalloonDevice = VZVirtioTraditionalMemoryBalloonDeviceConfiguration()
47 | 
48 |         let storageDevices = try image.map { image -> VZVirtioBlockDeviceConfiguration in
49 |             let attachment = try VZDiskImageStorageDeviceAttachment(url: URL(fileURLWithPath: image), readOnly: true)
50 |             return VZVirtioBlockDeviceConfiguration(attachment: attachment)
51 |         }
52 | 
53 |         let networkDevice = VZVirtioNetworkDeviceConfiguration()
54 |         networkDevice.attachment = VZNATNetworkDeviceAttachment()
55 | 
56 |         let configuration = VZVirtualMachineConfiguration()
57 |         configuration.bootLoader = bootLoader
58 |         configuration.memorySize = UInt64(memorySize * 1024 * 1024)
59 |         configuration.cpuCount = cpuCount
60 |         configuration.entropyDevices = [entropyDevice]
61 |         configuration.memoryBalloonDevices = [memoryBalloonDevice]
62 |         configuration.networkDevices = [networkDevice]
63 |         configuration.serialPorts = [serialPort]
64 |         configuration.storageDevices = storageDevices
65 | 
66 |         try configuration.validate()
67 | 
68 |         let machine = VZVirtualMachine(configuration: configuration)
69 |         machine.start { result in
70 |             switch result {
71 |             case .success:
72 |                 break
73 |             case .failure(let error):
74 |                 print(error)
75 |             }
76 |         }
77 | 
78 |         RunLoop.main.run()
79 |     }
80 | }
81 | 


--------------------------------------------------------------------------------
/TinyLinux.xcodeproj/xcshareddata/xcschemes/TinyLinux.xcscheme:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <Scheme
 3 |    LastUpgradeVersion = "1230"
 4 |    version = "1.3">
 5 |    <BuildAction
 6 |       parallelizeBuildables = "YES"
 7 |       buildImplicitDependencies = "YES">
 8 |       <BuildActionEntries>
 9 |          <BuildActionEntry
10 |             buildForTesting = "YES"
11 |             buildForRunning = "YES"
12 |             buildForProfiling = "YES"
13 |             buildForArchiving = "YES"
14 |             buildForAnalyzing = "YES">
15 |             <BuildableReference
16 |                BuildableIdentifier = "primary"
17 |                BlueprintIdentifier = "54DE075625B2CD56008AA3BF"
18 |                BuildableName = "TinyLinux"
19 |                BlueprintName = "TinyLinux"
20 |                ReferencedContainer = "container:TinyLinux.xcodeproj">
21 |             </BuildableReference>
22 |          </BuildActionEntry>
23 |       </BuildActionEntries>
24 |    </BuildAction>
25 |    <TestAction
26 |       buildConfiguration = "Debug"
27 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
28 |       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
29 |       shouldUseLaunchSchemeArgsEnv = "YES">
30 |       <Testables>
31 |       </Testables>
32 |    </TestAction>
33 |    <LaunchAction
34 |       buildConfiguration = "Debug"
35 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
36 |       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
37 |       launchStyle = "0"
38 |       useCustomWorkingDirectory = "NO"
39 |       ignoresPersistentStateOnLaunch = "NO"
40 |       debugDocumentVersioning = "YES"
41 |       debugServiceExtension = "internal"
42 |       allowLocationSimulation = "YES">
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44 |          runnableDebuggingMode = "0">
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46 |             BuildableIdentifier = "primary"
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48 |             BuildableName = "TinyLinux"
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50 |             ReferencedContainer = "container:TinyLinux.xcodeproj">
51 |          </BuildableReference>
52 |       </BuildableProductRunnable>
53 |    </LaunchAction>
54 |    <ProfileAction
55 |       buildConfiguration = "Release"
56 |       shouldUseLaunchSchemeArgsEnv = "YES"
57 |       savedToolIdentifier = ""
58 |       useCustomWorkingDirectory = "NO"
59 |       debugDocumentVersioning = "YES">
60 |       <BuildableProductRunnable
61 |          runnableDebuggingMode = "0">
62 |          <BuildableReference
63 |             BuildableIdentifier = "primary"
64 |             BlueprintIdentifier = "54DE075625B2CD56008AA3BF"
65 |             BuildableName = "TinyLinux"
66 |             BlueprintName = "TinyLinux"
67 |             ReferencedContainer = "container:TinyLinux.xcodeproj">
68 |          </BuildableReference>
69 |       </BuildableProductRunnable>
70 |    </ProfileAction>
71 |    <AnalyzeAction
72 |       buildConfiguration = "Debug">
73 |    </AnalyzeAction>
74 |    <ArchiveAction
75 |       buildConfiguration = "Release"
76 |       revealArchiveInOrganizer = "YES">
77 |    </ArchiveAction>
78 | </Scheme>
79 | 


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108 | 			};
109 | 			buildConfigurationList = 54DE075225B2CD56008AA3BF /* Build configuration list for PBXProject "TinyLinux" */;
110 | 			compatibilityVersion = "Xcode 9.3";
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113 | 			knownRegions = (
114 | 				en,
115 | 				Base,
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118 | 			packageReferences = (
119 | 				54DE076725B2CDCA008AA3BF /* XCRemoteSwiftPackageReference "swift-argument-parser" */,
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141 | /* Begin XCBuildConfiguration section */
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145 | 				ALWAYS_SEARCH_USER_PATHS = NO;
146 | 				CLANG_ANALYZER_NONNULL = YES;
147 | 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
148 | 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
149 | 				CLANG_CXX_LIBRARY = "libc++";
150 | 				CLANG_ENABLE_MODULES = YES;
151 | 				CLANG_ENABLE_OBJC_ARC = YES;
152 | 				CLANG_ENABLE_OBJC_WEAK = YES;
153 | 				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
154 | 				CLANG_WARN_BOOL_CONVERSION = YES;
155 | 				CLANG_WARN_COMMA = YES;
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177 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
178 | 				ENABLE_TESTABILITY = YES;
179 | 				GCC_C_LANGUAGE_STANDARD = gnu11;
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181 | 				GCC_NO_COMMON_BLOCKS = YES;
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183 | 				GCC_PREPROCESSOR_DEFINITIONS = (
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188 | 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
189 | 				GCC_WARN_UNDECLARED_SELECTOR = YES;
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191 | 				GCC_WARN_UNUSED_FUNCTION = YES;
192 | 				GCC_WARN_UNUSED_VARIABLE = YES;
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194 | 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
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197 | 				SDKROOT = macosx;
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199 | 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
200 | 			};
201 | 			name = Debug;
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237 | 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
238 | 				ENABLE_NS_ASSERTIONS = NO;
239 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
240 | 				GCC_C_LANGUAGE_STANDARD = gnu11;
241 | 				GCC_NO_COMMON_BLOCKS = YES;
242 | 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
243 | 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
244 | 				GCC_WARN_UNDECLARED_SELECTOR = YES;
245 | 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
246 | 				GCC_WARN_UNUSED_FUNCTION = YES;
247 | 				GCC_WARN_UNUSED_VARIABLE = YES;
248 | 				MACOSX_DEPLOYMENT_TARGET = 11.0;
249 | 				MTL_ENABLE_DEBUG_INFO = NO;
250 | 				MTL_FAST_MATH = YES;
251 | 				SDKROOT = macosx;
252 | 				SWIFT_COMPILATION_MODE = wholemodule;
253 | 				SWIFT_OPTIMIZATION_LEVEL = "-O";
254 | 			};
255 | 			name = Release;
256 | 		};
257 | 		54DE075F25B2CD56008AA3BF /* Debug */ = {
258 | 			isa = XCBuildConfiguration;
259 | 			buildSettings = {
260 | 				CLANG_ENABLE_MODULES = YES;
261 | 				CODE_SIGN_ENTITLEMENTS = TinyLinux/TinyLinux.entitlements;
262 | 				CODE_SIGN_STYLE = Automatic;
263 | 				LD_RUNPATH_SEARCH_PATHS = (
264 | 					"$(inherited)",
265 | 					"@executable_path/../Frameworks",
266 | 					"@loader_path/../Frameworks",
267 | 				);
268 | 				PRODUCT_NAME = "$(TARGET_NAME)";
269 | 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
270 | 				SWIFT_VERSION = 5.0;
271 | 			};
272 | 			name = Debug;
273 | 		};
274 | 		54DE076025B2CD56008AA3BF /* Release */ = {
275 | 			isa = XCBuildConfiguration;
276 | 			buildSettings = {
277 | 				CLANG_ENABLE_MODULES = YES;
278 | 				CODE_SIGN_ENTITLEMENTS = TinyLinux/TinyLinux.entitlements;
279 | 				CODE_SIGN_STYLE = Automatic;
280 | 				LD_RUNPATH_SEARCH_PATHS = (
281 | 					"$(inherited)",
282 | 					"@executable_path/../Frameworks",
283 | 					"@loader_path/../Frameworks",
284 | 				);
285 | 				PRODUCT_NAME = "$(TARGET_NAME)";
286 | 				SWIFT_VERSION = 5.0;
287 | 			};
288 | 			name = Release;
289 | 		};
290 | /* End XCBuildConfiguration section */
291 | 
292 | /* Begin XCConfigurationList section */
293 | 		54DE075225B2CD56008AA3BF /* Build configuration list for PBXProject "TinyLinux" */ = {
294 | 			isa = XCConfigurationList;
295 | 			buildConfigurations = (
296 | 				54DE075C25B2CD56008AA3BF /* Debug */,
297 | 				54DE075D25B2CD56008AA3BF /* Release */,
298 | 			);
299 | 			defaultConfigurationIsVisible = 0;
300 | 			defaultConfigurationName = Release;
301 | 		};
302 | 		54DE075E25B2CD56008AA3BF /* Build configuration list for PBXNativeTarget "TinyLinux" */ = {
303 | 			isa = XCConfigurationList;
304 | 			buildConfigurations = (
305 | 				54DE075F25B2CD56008AA3BF /* Debug */,
306 | 				54DE076025B2CD56008AA3BF /* Release */,
307 | 			);
308 | 			defaultConfigurationIsVisible = 0;
309 | 			defaultConfigurationName = Release;
310 | 		};
311 | /* End XCConfigurationList section */
312 | 
313 | /* Begin XCRemoteSwiftPackageReference section */
314 | 		54DE076725B2CDCA008AA3BF /* XCRemoteSwiftPackageReference "swift-argument-parser" */ = {
315 | 			isa = XCRemoteSwiftPackageReference;
316 | 			repositoryURL = "https://github.com/apple/swift-argument-parser";
317 | 			requirement = {
318 | 				kind = exactVersion;
319 | 				version = 1.1.2;
320 | 			};
321 | 		};
322 | /* End XCRemoteSwiftPackageReference section */
323 | 
324 | /* Begin XCSwiftPackageProductDependency section */
325 | 		54DE076825B2CDCA008AA3BF /* ArgumentParser */ = {
326 | 			isa = XCSwiftPackageProductDependency;
327 | 			package = 54DE076725B2CDCA008AA3BF /* XCRemoteSwiftPackageReference "swift-argument-parser" */;
328 | 			productName = ArgumentParser;
329 | 		};
330 | /* End XCSwiftPackageProductDependency section */
331 | 	};
332 | 	rootObject = 54DE074F25B2CD56008AA3BF /* Project object */;
333 | }
334 | 


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