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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-s390/] [io.h] - Rev 1765
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/* * include/asm-s390/io.h * * S390 version * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) * * Derived from "include/asm-i386/io.h" */ #ifndef _S390_IO_H #define _S390_IO_H #ifdef __KERNEL__ #include <linux/vmalloc.h> #include <asm/page.h> #define IO_SPACE_LIMIT 0xffffffff #define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x))) #define __io_phys(x) ((unsigned long)(x) & ~PAGE_OFFSET) /* * Change virtual addresses to physical addresses and vv. * These are pretty trivial */ extern inline unsigned long virt_to_phys(volatile void * address) { unsigned long real_address; __asm__ (" lra %0,0(%1)\n" " jz 0f\n" " sr %0,%0\n" "0:" : "=a" (real_address) : "a" (address) : "cc" ); return real_address; } extern inline void * phys_to_virt(unsigned long address) { return __io_virt(address); } /* * Change "struct page" to physical address. */ #define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT) extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags); extern inline void * ioremap (unsigned long offset, unsigned long size) { return __ioremap(offset, size, 0); } /* * This one maps high address device memory and turns off caching for that area. * it's useful if some control registers are in such an area and write combining * or read caching is not desirable: */ extern inline void * ioremap_nocache (unsigned long offset, unsigned long size) { return __ioremap(offset, size, 0); } extern void iounmap(void *addr); /* * IO bus memory addresses are also 1:1 with the physical address */ #define virt_to_bus virt_to_phys #define bus_to_virt phys_to_virt /* * readX/writeX() are used to access memory mapped devices. On some * architectures the memory mapped IO stuff needs to be accessed * differently. */ #define readb(addr) (*(volatile unsigned char *) __io_virt(addr)) #define readw(addr) (*(volatile unsigned short *) __io_virt(addr)) #define readl(addr) (*(volatile unsigned int *) __io_virt(addr)) #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b)) #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b)) #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b)) #define memset_io(a,b,c) memset(__io_virt(a),(b),(c)) #define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c)) #define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c)) #define inb_p(addr) readb(addr) #define inb(addr) readb(addr) #define outb(x,addr) ((void) writeb(x,addr)) #define outb_p(x,addr) outb(x,addr) #endif /* __KERNEL__ */ #endif