http://d.hatena.ne.jp/cupnes/comment/20130403/1364974831
使用的系统版本是
Red Hat Enterprise Linux Server release 6.5 (Santiago)
gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
测试如下：
本地跑的jslinux参考
http://haoningabc.iteye.com/blog/1397960
这个版本是用的2.6.20
其实可以编译3.19的版本的内核
http://bellard.org/jslinux/
下载官网的
linuxstart-20120111
里面的文件config_linux-2.6.20 是编译内核用的
比如在
linuxstart-20120111同级目录下下载内核
http://www.linux-mips.org/pub/linux/mips/kernel/v2.6/
linux-2.6.20.tar.bz2
[root@node11 tmp]# cat run26.sh #!/bin/sh tar -jxvf linux-2.6.20.tar.bz2 cp ./linuxstart-20120111/config_linux-2.6.20 ./linux-2.6.20/.config cd ./linux-2.6.20/ patch -p1 <../linuxstart-20120111/patch_linux-2.6.20 echo "vim linux-2.6.20/scripts/mod/sumversion.c " echo "adding #include" echo "if this is centos7 and gcc 4.8.3 ,something must do " echo "time make ARCH=i386 -j16 "
如果是centos7的
gcc (GCC) 4.8.3 20140911 (Red Hat 4.8.3-9)
可能编译遇到问题
-------------------------centos7可能出现问题开始---------------------
Makefile:1439: *** mixed implicit and normal rules
config %config: scripts_basic outputmakefile FORCE 改成 %config: scripts_basic outputmakefile FORCE 将1279行代码： / %/: prepare scripts FORCE（错） 改为： %/: prepare scripts FORCE（对）
参考
http://blog.csdn.net/simonjay2007/article/details/7796390
如果遇到问题
gcc: error: elf_i386: No such file or directory gcc: error: unrecognized command line option ‘-m’
#sed -i "s/m elf_i386/m32/g" `grep "m elf_i386" -rl .`
只改vim arch/i386/kernel/Makefile 中的 -m elf_i386 变-m32 注意只改gcc后面的，ld的不修改
如果出现错误
kernel/built-in.o: In function `mutex_lock': (.sched.text+0xe25): undefined reference to `__mutex_lock_slowpath' kernel/built-in.o: In function `mutex_unlock': (.sched.text+0xe35): undefined reference to `__mutex_unlock_slowpath' make: *** [.tmp_vmlinux1] Error 1
如果是mutex相关的错误
未定义什么mutex加锁和解锁
kernel/mutex.c
这个好使，其他的都是扯淡，什么该config参数，什么加__used都不行，需要把static去掉，加锁和解锁的
https://github.com/socketpair/jslinux_reversed/blob/master/contrib/patches/2.6.20_common_fixes.patch
__mutex_lock_slowpath的两个方法的static去掉
__mutex_unlock_slowpath的两个方法的static去掉
-------------------------centos7可能出现问题结束----------------------
1.由于gcc的版本问题，linux-2.6.20/scripts/mod/sumversion.c加了一行#include
2.使用config_linux-2.6.20作为linux内核的.config配置文件
3.patch_linux-2.6.20 增加了1个文件jsclipboard.c，修改了4个文件
patching file drivers/char/Kconfig patching file drivers/char/Makefile patching file drivers/char/jsclipboard.c patching file drivers/serial/8250.c patching file drivers/ide/ide-probe.c
jsclipboard是剪切板交互的功能
8250是串口
ide-probe是加速的一行代码
[root@node11 linux-2.6.20]# vim drivers/ide/ide-probe.c
865 for (unit = 0; unit < MAX_DRIVES; ++unit) {
866 ide_drive_t *drive = &hwif->drives[unit];
867
868 if (hwif->no_io_32bit)
869 drive->no_io_32bit = 1;
870 else
871 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
add 872 drive->io_32bit = 1;
873 }
这个补丁如果不打的话也是可以加载的只是不能用剪切板的交互
我们下载
linux-3.19.tar.gz
tar zxvf linux-3.19.tar.gz
cd linux-3.19
cp ../linuxstart-20120111/config_linux-2.6.20 .config
make ARCH=i386 -j16
一路回车下来
编译好的内核
参考linuxstart-20120111中的Makefile文件
objcopy -O binary ../linux-3.19/vmlinux vmlinux319.bin
生成js使用的内核
vmlinux319.bin
把vmlinux319.bin复制到
bellard.org/jslinux的目录,我们下载的可以跑jslinux的目录
修改jslinux.js
pc = new PCEmulator(params);
init_state.params = params;
//pc.load_binary("vmlinux-2.6.20.bin", 0x00100000, start2);
pc.load_binary("vmlinux319.bin", 0x00100000, start2);
}
function start2(ret)
{
if (ret < 0)
return;
init_state.start_addr = 0x10000;
pc.load_binary("linuxstart.bin", init_state.start_addr, start3);
}
加载重新生成的内核
以上直接编译的内核不带剪切板从linux到浏览器交互的功能
如果想交互
看patch文件
多一个
drivers/char/jsclipboard.c
由于内核的3.19的版本
注释掉一行
//#include
/* * JS clipboard support for JS/Linux * (c) 2011 Fabrice Bellard * */ #include#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include //#include #define JSCLIPBOARD_MINOR 231 #define JSCLIPBOARD_PORT 0x3c0 static int io_port = JSCLIPBOARD_PORT; static int minor = JSCLIPBOARD_MINOR; static struct semaphore open_sem; static int need_cache_sync; module_param(io_port, int, 0); MODULE_PARM_DESC(io_port, "IO port"); module_param(minor, int, 0); MODULE_PARM_DESC(minor, "minor number"); static ssize_t jsclipboard_read(struct file *file, char __user *buf, size_t count1, loff_t *ppos) { uint32_t pos, total_length, v; uint8_t b; size_t count, l; /* set read position */ pos = *ppos; outl(pos, io_port + 4); total_length = inl(io_port + 0); if (!access_ok(VERIFY_WRITE, buf, count1)) return -EFAULT; if (pos < total_length) l = total_length - pos; else l = 0; if (count1 > l) count1 = l; count = count1; while (count >= 4) { v = inl(io_port + 8); if (__put_user(v, (uint32_t *)buf)) return -EFAULT; buf += 4; count -= 4; } while (count != 0) { b = inb(io_port + 8); if (__put_user(b, buf)) return -EFAULT; buf++; count--; } *ppos = pos + count1; return count1; } static ssize_t jsclipboard_write(struct file *file, const char *buf, size_t count1, loff_t *ppos) { size_t count; uint8_t b; uint32_t v; if (!access_ok(VERIFY_READ, buf, count1)) return -EFAULT; if (*ppos == 0) { /* flush clipboard */ outl(0, io_port); } need_cache_sync = 1; count = count1; while (count >= 4) { if (__get_user(v, (uint32_t *)buf)) return -EFAULT; outl(v, io_port + 8); buf += 4; count -= 4; } while (count != 0) { if (__get_user(b, buf)) return -EFAULT; outb(b, io_port + 8); buf++; count--; } *ppos += count1; return count1; } static int jsclipboard_open(struct inode *inode, struct file *file) { if (down_trylock(&open_sem)) return -EBUSY; need_cache_sync = 0; return 0; } static int jsclipboard_release(struct inode *inode, struct file *file) { if (need_cache_sync) { outl(0, io_port + 12); } up(&open_sem); return 0; } static const struct file_operations jsclipboard_fops = { .owner = THIS_MODULE, .read = jsclipboard_read, .write = jsclipboard_write, .open = jsclipboard_open, .release = jsclipboard_release, }; static struct miscdevice jsclipboard_dev = { .minor = JSCLIPBOARD_MINOR, .name = "jsclipboard", .fops = &jsclipboard_fops, }; static int __init jsclipboard_init(void) { if (!request_region(io_port, 16, "jsclipboard")) return -ENODEV; sema_init(&open_sem, 1); if (misc_register(&jsclipboard_dev)) { return -ENODEV; } printk(KERN_INFO "JS clipboard: I/O at 0x%04x\n", io_port); return 0; } static void __exit jsclipboard_exit (void) { misc_deregister(&jsclipboard_dev); release_region(io_port, 16); } module_init(jsclipboard_init); module_exit(jsclipboard_exit); MODULE_AUTHOR("Fabrice Bellard"); MODULE_LICENSE("GPL");
修改kconfig和Makefile文件
/drivers/char/Kconfig
在 files for controlling the behavior of this hardware
下面加
config JSCLIPBOARD
tristate "Javascript clipboard support (JS/Linux device)"
default n
help
Javascript clipboard support for JS/Linux
drivers/char/Makefile
obj-$(CONFIG_HANGCHECK_TIMER) += hangcheck-timer.o obj-$(CONFIG_TCG_TPM) += tpm/ +obj-$(CONFIG_JSCLIPBOARD) += jsclipboard.o
再重新
make ARCH=i386 -j16
生成vmlinux
再用objcopy
objcopy -O binary ../linux-3.19/vmlinux vmlinux319.bin
生成bin给jslinux.js用
测试
在js跑的linux中
/var/root # echo "aaa" > /dev/clipboard
可以看到页面上的剪切板有了变化
如果不用jslinux，想用qemu直接启动
使用
cd jslinux/bin cat cat hda000000*.bin > hda.bin 得到jslinux的硬盘hda.bin /usr/libexec/qemu-kvm -kernel linux-2.6.20/arch/i386/boot/bzImage -hda hda.bin -append "root=/dev/hda" -serial stdio -vnc 0.0.0.0:3
注意使用 -serial stdio
vnc连到这个vm后只显示
Booting from ROM... Uncompressing Linux... Ok, booting the kernel.
操作还在终端
参考
https://balau82.wordpress.com/2010/04/12/booting-linux-with-u-boot-on-qemu-arm/
如果使用官方的 linux-0.2.img
直接用
/usr/libexec/qemu-kvm -hda linux-0.2.img -vnc 0.0.0.0:3
把linux-0.2.img mount到硬盘上可以看到boot里面已经有2.6.20的内核了。
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