linux/arch/x86/include/asm/x86_init.h

#ifndef _ASM_X86_PLATFORM_H
#define _ASM_X86_PLATFORM_H

/**
 * struct x86_init_ops - functions for platform specific setup
 *
 */
struct x86_init_ops {
};

extern struct x86_init_ops x86_init;

extern void x86_init_noop(void);

#endif
x86: Add x86_init infrastructure The upcoming Moorestown support brings the embedded world to x86. The setup code of x86 has already a couple of hooks which are either x86_quirks or paravirt ops. Some of those setup hooks are pretty convoluted like the timer setup and the tsc calibration code. But there are other places which could do with a cleanup. Instead of having inline functions/macros which are modified at compile time I decided to introduce x86_init ops which are unconditional in the code and make it clear that they can be changed either during compile time or in the early boot process. The function pointers are initialized by default functions which can be noops so that the pointer can be called unconditionally in the most cases. This also allows us to remove 32bit/64bit, paravirt and other #ifdeffery. paravirt guests are just a hardware platform in the setup code, so we should treat them as such and not hide all behind multiple layers of indirection and compile time dependencies. It's more obvious that x86_init.timers.timer_init() is a function pointer than the late_time_init = choose_time_init() obscurity. It's also way simpler to grep for x86_init.timers.timer_init and find all the places which modify that function pointer instead of analyzing weak functions, macros and paravirt indirections. Note. This is not a general paravirt_ops replacement. It just will move setup related hooks which are potentially useful for other platform setup purposes as well out of the paravirt domain. Add the base infrastructure without any functionality. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> 2009-08-19 12:48:38 +00:00			`#ifndef _ASM_X86_PLATFORM_H`
			`#define _ASM_X86_PLATFORM_H`

			`/**`
			`* struct x86_init_ops - functions for platform specific setup`
			`*`
			`*/`
			`struct x86_init_ops {`
			`};`

			`extern struct x86_init_ops x86_init;`

			`extern void x86_init_noop(void);`

			`#endif`