1. 根目录:
2. arch
3. x86
4. include
5. asm
6. msi.h

#ifndef _ASM_X86_MSI_H
#define _ASM_X86_MSI_H
#include <asm/hw_irq.h>

typedef struct irq_alloc_info msi_alloc_info_t;

#endif /* _ASM_X86_MSI_H */