ruxpin
1.0.0
试图为Raspberry Pi 3制作操作系统。由于时间限制，我优先考虑获得一些有效的东西而不是尝试新想法，因此现在这是一个具有Unix类API的单片OS，但是我将来可能会改变这一点。我在很大程度上复制了我为Gloworm OS所做的工作。
目前，它具有对虚拟内存的支持，并具有按需页面分配，但尚无支持将内存交换为磁盘。它具有一个虚拟文件系统，并支持Ext2文件系统以及一些内存文件系统。它支持多个进程，由系统计时器触发的上下文切换，但尚未支持多个线程。
当前，只有一个控制台驱动程序（TTY子系统）和SD/EMMC卡驱动程序（块设备子系统）。块驱动程序子系统为文件系统从磁盘读取的缓存块提供了一个bufcache。借用为可变的块被标记为脏，并将写回下一个块提交。 EXT2写作支持尚未经过很好的测试，因此目前禁用承诺。
应用程序可以用Rust编写，并与随附的库一起编译，这些库使用AARCH64 SVC指令对操作系统进行系统调用。它目前支持基本文件操作以及exit ， fork和exec 。操作系统可以直接加载由货物作为应用产生的精灵二进制文件，并运行它们。可以使用一个简单的外壳程序（在初始化后内核启动）和ls命令，但仅在概念阶段。
该OS由一个内核和一些应用程序组成，这些应用程序都分别编译。可以将应用程序加载到EXT2分区中，可以由内核读取，但是内核需要单独加载，因此不包含在图像中。
通常，当覆盆子Pi靴子时，固件在包含文件kernel8.img的microSD卡上寻找脂肪分区，然后将其加载在地址0x80000并运行。内核运行后，它可以安装任何其他分区以用作根文件系统。在QEMU中运行时，内核图像将在命令行上传递，以及包含EXT2分区的磁盘图像的文件名。
项目根中提供了一个makefile，以构建EXT2磁盘映像。为了使在QEMU或硬件上测试代码变得更容易，它创建了一个与microSD卡相同的磁盘映像（即脂肪分区和EXT2分区）。使用QEMU时，脂肪分区将被忽略。
要创建图像，从Linux计算机运行：
make create-image
make load-image这将创建一个新的4GB图像文件，使用mkfs.ext2在其内部创建一个新的文件系统，将其安装在<project>/build环回设备中，然后编译并将应用程序加载到其中。它还将硬编码的分区表复制到图像中，该表复制了硬件使用的分区。
创建图像后，可以使用以下方式在Qemu中编译内核并运行：
cd config/raspberrypi3/
make
./qemu.sh要在Raspberry Pi上运行，目前需要一个USB串行控制台。我正在使用从Rust Raspberry Pi Os教程中的Miniload程序来将内核链上串行端口上的链条。可以将编译的内核图像（ ruxpin.img ）放入创建文件的引导分区中并将其写入磁盘，但我尚未对其进行测试。
在QEMU中运行时，从控制台复制以下输出。它有很多调试消息可以显示发生的事情。它首先设置内核堆和页面内存，注册文件系统类型，初始化设备驱动程序并安装root ext2分区。然后，它执行许多测试以检查基本文件系统功能，然后启动第一个过程（Shell）。然后在启动ls程序的“ <>”之间键入命令，在/中打印了文件和目录的列表，然后退回回Shell提示。
starting kernel...
kernel heap: using 0x200000, size 14MiB
virtual memory: using region at PhysicalAddress(0x1000000), size 240 MiB, pages 61438
interrupts: initializing generic arm interrupt controller
fs: registering filesystem tmpfs
fs: registering filesystem devfs
fs: registering filesystem ext2
console: initializing
sd: initializing
sd: found partition 0 at 2000, 256 MiB
sd: found partition 1 at 82000, 740 MiB
fs: mounting ext2 at /, device Some(DeviceID(0, 2))
ext2: magic number ef53, block size 4096
ext2: total blocks 982016, total inodes 245760, unallocated blocks: 963991, unallocated inodes: 245742
ext2: features compat: 38, ro: 3, incompat: 2
ext2: allocating inode 13
fs: mounting devfs at /dev, device None
ext2: looking for "dev", found inode 13
Running some hardcoded tests before completing the startup
Mounting the tmpfs filesystem (simple in-memory file system)
ext2: allocating inode 14
fs: mounting tmpfs at /tmp, device None
ext2: looking for "tmp", found inode 14
Creating a directory and a file inside of it
ext2: allocating inode 15
ext2: looking for "testdir", found inode 15
ext2: allocating inode 16
ext2: allocating block 761 in group 0
ext2: allocating block 762 in group 0
ext2: writing to block 762
Read file 14: This is a test
Opening the console device file and writing to it
ext2: looking for "dev", found inode 13
the device file can write
Opening the testapp binary through the vfs interface and reading some data
ext2: looking for "bin", found inode 32769
ext2: looking for "testapp", found inode 32770
read in 1024 bytes
0xffff00000007f790: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
0xffff00000007f7a0: 02 00 b7 00 01 00 00 00 70 29 21 00 00 00 00 00
0xffff00000007f7b0: 40 00 00 00 00 00 00 00 d0 c8 0d 00 00 00 00 00
0xffff00000007f7c0: 00 00 00 00 40 00 38 00 04 00 40 00 10 00 0e 00
0xffff00000007f7d0: 06 00 00 00 04 00 00 00 40 00 00 00 00 00 00 00
0xffff00000007f7e0: 40 00 20 00 00 00 00 00 40 00 20 00 00 00 00 00
0xffff00000007f7f0: e0 00 00 00 00 00 00 00 e0 00 00 00 00 00 00 00
0xffff00000007f800: 08 00 00 00 00 00 00 00 01 00 00 00 04 00 00 00
0xffff00000007f810: 00 00 00 00 00 00 00 00 00 00 20 00 00 00 00 00
0xffff00000007f820: 00 00 20 00 00 00 00 00 60 09 00 00 00 00 00 00
0xffff00000007f830: 60 09 00 00 00 00 00 00 00 00 01 00 00 00 00 00
0xffff00000007f840: 01 00 00 00 05 00 00 00 60 09 00 00 00 00 00 00
0xffff00000007f850: 60 09 21 00 00 00 00 00 60 09 21 00 00 00 00 00
0xffff00000007f860: d8 31 00 00 00 00 00 00 d8 31 00 00 00 00 00 00
0xffff00000007f870: 00 00 01 00 00 00 00 00 51 e5 74 64 06 00 00 00
0xffff00000007f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007f890: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007f8a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007f8b0: 63 61 6c 6c 65 64 20 60 52 65 73 75 6c 74 3a 3a
0xffff00000007f8c0: 75 6e 77 72 61 70 28 29 60 20 6f 6e 20 61 6e 20
0xffff00000007f8d0: 60 45 72 72 60 20 76 61 6c 75 65 00 00 00 00 00
0xffff00000007f8e0: 60 09 21 00 00 00 00 00 08 00 00 00 00 00 00 00
0xffff00000007f8f0: 08 00 00 00 00 00 00 00 20 10 21 00 00 00 00 00
0xffff00000007f900: 60 09 21 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007f910: 01 00 00 00 00 00 00 00 94 28 21 00 00 00 00 00
0xffff00000007f920: 61 20 72 65 61 6c 6c 79 20 63 6f 6f 6c 20 6d 65
0xffff00000007f930: 73 73 61 67 65 20 74 68 61 74 20 49 27 64 20 6c
0xffff00000007f940: 69 6b 65 20 74 6f 20 73 65 65 00 00 00 00 00 00
0xffff00000007f950: 90 01 20 00 00 00 00 00 2a 00 00 00 00 00 00 00
0xffff00000007f960: 73 72 63 2f 6d 61 69 6e 2e 72 73 00 00 00 00 00
0xffff00000007f970: d0 01 20 00 00 00 00 00 0b 00 00 00 00 00 00 00
0xffff00000007f980: 0c 00 00 00 05 00 00 00 0a 2f 6d 6e 74 2f 74 65
0xffff00000007f990: 73 74 32 00 00 00 00 00 d0 01 20 00 00 00 00 00
0xffff00000007f9a0: 0b 00 00 00 00 00 00 00 0e 00 00 00 51 00 00 00
0xffff00000007f9b0: d0 01 20 00 00 00 00 00 0b 00 00 00 00 00 00 00
0xffff00000007f9c0: 10 00 00 00 28 00 00 00 d0 01 20 00 00 00 00 00
0xffff00000007f9d0: 0b 00 00 00 00 00 00 00 11 00 00 00 19 00 00 00
0xffff00000007f9e0: d0 01 20 00 00 00 00 00 0b 00 00 00 00 00 00 00
0xffff00000007f9f0: 11 00 00 00 2a 00 00 00 d0 01 20 00 00 00 00 00
0xffff00000007fa00: 0b 00 00 00 00 00 00 00 12 00 00 00 11 00 00 00
0xffff00000007fa10: d0 01 20 00 00 00 00 00 0b 00 00 00 00 00 00 00
0xffff00000007fa20: 17 00 00 00 38 00 00 00 d0 01 20 00 00 00 00 00
0xffff00000007fa30: 0b 00 00 00 00 00 00 00 1a 00 00 00 10 00 00 00
0xffff00000007fa40: 72 65 61 64 20 69 6e 20 00 00 00 00 20 00 00 00
0xffff00000007fa50: 4e 6f 74 41 46 69 6c 65 d0 01 20 00 00 00 00 00
0xffff00000007fa60: 0b 00 00 00 00 00 00 00 1c 00 00 00 31 00 00 00
0xffff00000007fa70: d0 01 20 00 00 00 00 00 0b 00 00 00 00 00 00 00
0xffff00000007fa80: 1d 00 00 00 31 00 00 00 64 6f 6e 65 00 00 00 00
0xffff00000007fa90: f8 02 20 00 00 00 00 00 04 00 00 00 00 00 00 00
0xffff00000007faa0: d0 01 20 00 00 00 00 00 0b 00 00 00 00 00 00 00
0xffff00000007fab0: 2d 00 00 00 05 00 00 00 65 78 65 63 75 74 69 6e
0xffff00000007fac0: 67 20 73 65 6c 66 00 00 28 03 20 00 00 00 00 00
0xffff00000007fad0: 0e 00 00 00 00 00 00 00 d0 01 20 00 00 00 00 00
0xffff00000007fae0: 0b 00 00 00 00 00 00 00 24 00 00 00 15 00 00 00
0xffff00000007faf0: 46 69 6c 65 53 69 7a 65 54 6f 6f 4c 61 72 67 65
0xffff00000007fb00: 4e 6f 53 75 63 68 46 69 6c 65 73 79 73 74 65 6d
0xffff00000007fb10: 2f 6d 6e 74 2f 62 69 6e 2f 74 65 73 74 61 70 70
0xffff00000007fb20: 54 6f 6f 4d 61 6e 79 46 69 6c 65 73 4f 70 65 6e
0xffff00000007fb30: 72 61 6e 67 65 20 65 6e 64 20 69 6e 64 65 78 20
0xffff00000007fb40: 50 0e 21 00 00 00 00 00 08 00 00 00 00 00 00 00
0xffff00000007fb50: 08 00 00 00 00 00 00 00 90 0f 21 00 00 00 00 00
0xffff00000007fb60: 60 0e 21 00 00 00 00 00 50 0f 21 00 00 00 00 00
0xffff00000007fb70: 00 05 0a 0f 14 19 1e 23 28 2d 32 37 3c 41 46 4b
0xffff00000007fb80: 50 55 5a 5f 64 69 6e 73 78 7d 82 87 8c 91 63 61
Opening a new file and writing some data into it
ext2: allocating inode 17
ext2: allocating block 763 in group 0
ext2: writing to block 763
Reading back the data written previously
ext2: looking for "test2", found inode 17
0xffff00000007fba0: 74 68 69 73 20 69 73 20 73 6f 6d 65 20 74 65 73
0xffff00000007fbb0: 74 20 64 61 74 61 00 00 00 00 00 00 00 00 00 00
0xffff00000007fbc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007fbd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007fbe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007fbf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xffff00000007fc10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Printing the contents of the root directory (ext2 mount)
reading dir . with inode 2
reading dir .. with inode 2
reading dir lost+found with inode 11
reading dir bin with inode 32769
reading dir test with inode 12
reading dir dev with inode 13
reading dir tmp with inode 14
reading dir testdir with inode 15
reading dir test2 with inode 17
Finished tests
loading the first processs (/bin/sh) from elf binary file
ext2: looking for "bin", found inode 32769
ext2: looking for "sh", found inode 32772
program segment 0: 6 4 offset: 40 v:200040 p:200040 size: e0
program segment 1: 1 4 offset: 0 v:200000 p:200000 size: 1870
program segment 2: 1 5 offset: 1870 v:211870 p:211870 size: 53c8
program segment 3: 6474e551 6 offset: 0 v:0 p:0 size: 0
ext2: looking for "dev", found inode 13
timer: initializing generic arm timer to trigger context switch
kernel initialization complete
scheduler: starting multitasking
Instruction or Data Abort caused by Access Flag at address 215a70 (allocating new page)
Instruction or Data Abort caused by Access Flag at address fffffff0 (allocating new page)
Instruction or Data Abort caused by Access Flag at address 21337c (allocating new page)
Instruction or Data Abort caused by Access Flag at address 212190 (allocating new page)
Starting shell...
Instruction or Data Abort caused by Access Flag at address 216c34 (allocating new page)
% <typing in ls>
Instruction or Data Abort caused by Access Flag at address 2140e8 (allocating new page)
executing /bin/ls
child pid is 3
clearing old process space
executing a new process
ext2: looking for "bin", found inode 32769
ext2: looking for "ls", found inode 32774
program segment 0: 6 4 offset: 40 v:200040 p:200040 size: e0
program segment 1: 1 4 offset: 0 v:200000 p:200000 size: 730
program segment 2: 1 5 offset: 730 v:210730 p:210730 size: 2cb8
program segment 3: 6474e551 6 offset: 0 v:0 p:0 size: 0
ext2: looking for "dev", found inode 13
Instruction or Data Abort caused by Access Flag at address 212220 (allocating new page)
Instruction or Data Abort caused by Access Flag at address fffffff0 (allocating new page)
ext2: looking for ".", found inode 2
Instruction or Data Abort caused by Access Flag at address 2133e4 (allocating new page)
Instruction or Data Abort caused by Access Flag at address 2110e4 (allocating new page)
.
..
lost+found
bin
test
dev
tmp
testdir
test2
Exiting process 3
%
