From df59e7bf439918f523ac29e996ec1eebbed60440 Mon Sep 17 00:00:00 2001 From: Brian Gerst Date: Wed, 9 Dec 2009 12:34:44 -0500 Subject: x86: Merge kernel_thread() Signed-off-by: Brian Gerst LKML-Reference: <1260380084-3707-6-git-send-email-brgerst@gmail.com> Signed-off-by: H. Peter Anvin --- arch/x86/kernel/process.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'arch/x86/kernel/process.c') diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index f3c1a6b3a65e..8705ccedd447 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -243,6 +243,41 @@ sys_clone(unsigned long clone_flags, unsigned long newsp, return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid); } +/* + * This gets run with %si containing the + * function to call, and %di containing + * the "args". + */ +extern void kernel_thread_helper(void); + +/* + * Create a kernel thread + */ +int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) +{ + struct pt_regs regs; + + memset(®s, 0, sizeof(regs)); + + regs.si = (unsigned long) fn; + regs.di = (unsigned long) arg; + +#ifdef CONFIG_X86_32 + regs.ds = __USER_DS; + regs.es = __USER_DS; + regs.fs = __KERNEL_PERCPU; + regs.gs = __KERNEL_STACK_CANARY; +#endif + + regs.orig_ax = -1; + regs.ip = (unsigned long) kernel_thread_helper; + regs.cs = __KERNEL_CS | get_kernel_rpl(); + regs.flags = X86_EFLAGS_IF | 0x2; + + /* Ok, create the new process.. */ + return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); +} +EXPORT_SYMBOL(kernel_thread); /* * sys_execve() executes a new program. -- cgit v1.2.3