1. 根目录:
2. arch
3. arm
4. include
5. asm
6. xen
7. hypervisor.h

#ifndef _ASM_ARM_XEN_HYPERVISOR_H
#define _ASM_ARM_XEN_HYPERVISOR_H

extern struct shared_info *HYPERVISOR_shared_info;
extern struct start_info *xen_start_info;

/* Lazy mode for batching updates / context switch */
enum paravirt_lazy_mode {
	PARAVIRT_LAZY_NONE,
	PARAVIRT_LAZY_MMU,
	PARAVIRT_LAZY_CPU,
};

static inline enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
{
	return PARAVIRT_LAZY_NONE;
}

extern struct dma_map_ops *xen_dma_ops;

#endif /* _ASM_ARM_XEN_HYPERVISOR_H */