Linux内核常用API内存中 I/O内存代码是什么？

request_mem_region(start,n,name) 向内核申请io内存的独有权，当地址被多个驱动使用不可用
release_mem_region(start,n)
void __iomem *ioremap(phys_addr_t offset, unsigned long size)
void iounmap(void __iomem *addr)
u8 readb(const volatile void __iomem *addr)
u16 readw(const volatile void __iomem *addr)
u32 readl(const volatile void __iomem *addr)
void writeb(u8 b, volatile void __iomem *addr)
void writew(u16 b, volatile void __iomem *addr)
void write1(u32 b, volatile void __iomem *addr)
ioread8(addr)
ioread16(addr)
ioread32(addr)
iowrite8(v, addr)
iowrite16(v, addr)
iowrite32(v, addr)
ioread8_rep(p, dst, count)
ioread16_rep(p, dst, count)
ioread32_rep(p, dst, count)
iowrite8_rep(p, dst, count)
iowrite16_rep(p, dst, count)
iowrite32_rep(p, dst, count)

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