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kernel_thread¶¨ÒåÔÚ/arch/kernel/process.c
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
struct pt_regs regs;
memset(®s, 0, sizeof(regs)); //°Ñ¸Ã½á¹¹µÄ±äÁ¿È«²¿Çå0
regs.ebx = (unsigned long) fn; /* ebxÖ¸Ïòº¯ÊýµØÖ· */
regs.edx = (unsigned long) arg; /* edxÖ¸Ïò²ÎÊýµØÖ· */
regs.xds = __USER_DS;
regs.xes = __USER_DS;
regs.xfs = __KERNEL_PERCPU;
regs.orig_eax = -1;
regs.eip = (unsigned long) kernel_thread_helper; /*eipÖ¸Ïò»Øµ÷º¯Êý*/
regs.xcs = __KERNEL_CS | get_kernel_rpl();
regs.eflags = X86_EFLAGS_IF | X86_EFLAGS_SF | X86_EFLAGS_PF | 0x2;
/* ÀûÓÃdo_forkÀ´²úÉúÒ»¸öеÄÏß³Ì,¹²Ïí¸¸½ø³ÌµØÖ·¿Õ¼ä,²¢ÇÒ²»ÔÊÐíµ÷ÊÔ×Ó½ø³Ì */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
}
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extern void kernel_thread_helper(void);
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