在头文件里 arch/arm/mach-s3c2410/include/mach/irqs.h
/* we keep the first set of CPU IRQs out of the range of
* the ISA space, so that the PC104 has them to itself
* and we don't end up having to do horrible things to the
* standard ISA drivers....
*/
#define S3C2410_CPUIRQ_OFFSET (16) //这里为什么是16呢？是怎么得出来的？
#define S3C2410_IRQ(x) ((x) + S3C2410_CPUIRQ_OFFSET)
/* main cpu interrupts */
#define IRQ_EINT0 S3C2410_IRQ(0) /* 16 */
#define IRQ_EINT1 S3C2410_IRQ(1)
#define IRQ_EINT2 S3C2410_IRQ(2)
#define IRQ_EINT3 S3C2410_IRQ(3)
求大虾指导呀！！！！！！！！！！！！！！！！
