代码拉取完成，页面将自动刷新
第一点: 代码量适中，统计大约 6000 行左右
xv6 代码统计
github.com/AlDanial/cloc v 1.90 T=0.06 s (1311.7 files/s, 159249.8 lines/s) ------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 46 1023 755 6455 C/C++ Header 22 145 131 842 make 1 36 33 210 Assembly 7 51 117 201 Perl 4 22 23 105 Pascal 1 24 60 50 Bourne Shell 3 7 3 23 Lisp 1 0 0 4 ------------------------------------------------------------------------------- SUM: 85 1308 1122 7890 -------------------------------------------------------------------------------
linux 0.11 代码统计
github.com/AlDanial/cloc v 1.90 T=0.09 s (1163.5 files/s, 161025.8 lines/s) ------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 51 782 1049 6747 C/C++ Header 33 327 260 2154 Assembly 8 165 312 1458 make 8 74 52 460 ------------------------------------------------------------------------------- SUM: 100 1348 1673 10819 -------------------------------------------------------------------------------
minix1 代码统计
github.com/AlDanial/cloc v 1.90 T=0.05 s (451.0 files/s, 133013.8 lines/s) ------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 12 706 1245 3083 Assembly 4 224 386 970 make 2 30 6 149 DOS Batch 2 1 0 139 C/C++ Header 4 25 27 88 ------------------------------------------------------------------------------- SUM: 24 986 1664 4429 -------------------------------------------------------------------------------
第二点：代码比较干净 clean code
第三点：代码比较现代 morden
和真实操作系统对比缺失部分
------------+==================================================
|
| vi cat echo
User Mode | | sh | ls |
| | | | | |
| +---------+-----+-----+
| |
| v
------------|=========== SYSCALL ==============================
| | ^
| | +------------+
| v |
Kernel Mode | [sys_fork/sys_exec] -> [exec/io_wait]
|
| [scheduler]
------------+==================================================
xv6 实现了如下的系统调用, 系统调用是操作系统提供给用户进程编写代码的 API
| NO. | SYSCALL | Description |
|---|---|---|
| 1 | fork() | Create a process |
| 2 | exit() | Terminate the current process |
| 3 | wait() | Wait for a child process to exit |
| 4 | kill(pid) | Terminate process pid |
| 5 | getpid() | Return the current process’s pid |
| 6 | sleep(n) | Sleep for n clock ticks |
| 7 | exec(filename, *argv) | Load a file and execute it |
| 8 | sbrk(n) | Grow process’s memory by n bytes |
| 9 | open(filename, flags) | Open a file; the flags indicate read/write |
| 10 | read(fd, buf, n) | Read n bytes from an open file into buf |
| 11 | write(fd, buf, n) | Write n bytes to an open file |
| 12 | close(fd) | Release open file fd |
| 13 | dup(fd) | Duplicate fd |
| 14 | pipe(p) | Create a pipe and return fd’s in p |
| 15 | chdir(dirname) | Change the current directory |
| 16 | mkdir(dirname) | Create a new directory |
| 17 | mknod(name, major, minor) | Create a device file |
| 18 | fstat(fd) | Return info about an open file |
| 19 | link(f1, f2) | Create another name (f2) for the file f1 |
| 20 | unlink(filename) | Remove a file |
0xFFFFFFFF -> |-------------| -
| | ^
| | |
| Free Memory |
| | Kernel Space
|-------------|
| Text & Data |
| | |
0x80100000 -> |-------------| |
| BIOS | v
0x80000000 -> |-------------| -
(KERNBASE) | Heap | ^
| | | |
| v | |
| ... | |
| |
|-------------| User Space
| ... |
| ^ |
| | | |
| User stack | |
|-------------| |
| | |
| User | |
| Text & Data | v
0x0 -> |-------------| -
0xFFFFFFFF -> |-------------|
| Free Memory |
| |
|-------------|
| Text & Data |
0x80100000 -> |-------------| -------+
| BIOS | |
0x80000000 -> |-------------| ----+ |
(KERNBASE) | Heap | | |
| | | | |
| v | | |
| ... | | |
| | | | |-------------| <- Top Physical memory
|-------------| | | | |
| ... | | | | |
| | | | | |
| ^ | | | | |
| | | | | |-------------| <- 4M (0x400000)
| User stack | | | | Kernel | <- end (0x1154d0)
|-------------| | | | Text & Data |
| | | | | |
| User | | +-----> |-------------| <- 0x100000
| Text & Data | | | BIOS |
0x0 -> |-------------| +--------> |-------------| <- 0x0
VIRTUAL PHYSICAL
core 1: 2GH/ 10ms
t: a b
t: 1 2 3 4
=======================
sh x s x s
vi s x s s
cat s s s x
core 1:
1 2 3
=======================
sh x s x
vi s x s
cat s s s
core 2:
1 2 3
=======================
sh s s s
vi x s s
cat s x x
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