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#ifndef _ASM_IO_H

#define _ASM_IO_H

#include <linux/config.h>

/*

 * This file contains the definitions for the x86 IO instructions

 * inb/inw/inl/outb/outw/outl and the "string versions" of the same

 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"

 * versions of the single-IO instructions (inb_p/inw_p/..).

 *

 * This file is not meant to be obfuscating: it's just complicated

 * to (a) handle it all in a way that makes gcc able to optimize it

 * as well as possible and (b) trying to avoid writing the same thing

 * over and over again with slight variations and possibly making a

 * mistake somewhere.

 */

/*

 * Thanks to James van Artsdalen for a better timing-fix than

 * the two short jumps: using outb's to a nonexistent port seems

 * to guarantee better timings even on fast machines.

 *

 * On the other hand, I'd like to be sure of a non-existent port:

 * I feel a bit unsafe about using 0x80 (should be safe, though)

 *

 *              Linus

 */

 /*

  *  Bit simplified and optimized by Jan Hubicka

  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.

  *

  *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,

  *  isa_read[wl] and isa_write[wl] fixed

  *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>

  */

#define IO_SPACE_LIMIT 0xffff

#define XQUAD_PORTIO_BASE 0xfe400000

#define XQUAD_PORTIO_QUAD 0x40000  /* 256k per quad. */

#ifdef __KERNEL__

#include <linux/vmalloc.h>

/*

 * Temporary debugging check to catch old code using

 * unmapped ISA addresses. Will be removed in 2.4.

 */

#ifdef CONFIG_DEBUG_IOVIRT

  extern void *__io_virt_debug(unsigned long x, const char *file, int line);

  #define __io_virt(x) __io_virt_debug((unsigned long)(x), __FILE__, __LINE__)

#else

  #define __io_virt(x) ((void *)(x))

#endif

/**

 *      virt_to_phys    -       map virtual addresses to physical

 *      @address: address to remap

 *

 *      The returned physical address is the physical (CPU) mapping for

 *      the memory address given. It is only valid to use this function on

 *      addresses directly mapped or allocated via kmalloc.

 *

 *      This function does not give bus mappings for DMA transfers. In

 *      almost all conceivable cases a device driver should not be using

 *      this function

 */

static inline unsigned long virt_to_phys(volatile void * address)

{

        return __pa(address);

}

/**

 *      phys_to_virt    -       map physical address to virtual

 *      @address: address to remap

 *

 *      The returned virtual address is a current CPU mapping for

 *      the memory address given. It is only valid to use this function on

 *      addresses that have a kernel mapping

 *

 *      This function does not handle bus mappings for DMA transfers. In

 *      almost all conceivable cases a device driver should not be using

 *      this function

 */

static inline void * phys_to_virt(unsigned long address)

{

        return __va(address);

}

/*

 * Change "struct page" to physical address.

 */

#define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)

extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);

/**

 * ioremap     -   map bus memory into CPU space

 * @offset:    bus address of the memory

 * @size:      size of the resource to map

 *

 * ioremap performs a platform specific sequence of operations to

 * make bus memory CPU accessible via the readb/readw/readl/writeb/

 * writew/writel functions and the other mmio helpers. The returned

 * address is not guaranteed to be usable directly as a virtual

 * address.

 */

static inline void * ioremap (unsigned long offset, unsigned long size)

{

        return __ioremap(offset, size, 0);

}

extern void * ioremap_nocache (unsigned long offset, unsigned long size);

extern void iounmap(void *addr);

/*

 * bt_ioremap() and bt_iounmap() are for temporary early boot-time

 * mappings, before the real ioremap() is functional.

 * A boot-time mapping is currently limited to at most 16 pages.

 */

extern void *bt_ioremap(unsigned long offset, unsigned long size);

extern void bt_iounmap(void *addr, unsigned long size);

/*

 * ISA I/O bus memory addresses are 1:1 with the physical address.

 */

#define isa_virt_to_bus virt_to_phys

#define isa_page_to_bus page_to_phys

#define isa_bus_to_virt phys_to_virt

/*

 * However PCI ones are not necessarily 1:1 and therefore these interfaces

 * are forbidden in portable PCI drivers.

 *

 * Allow them on x86 for legacy drivers, though.

 */

#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. On the x86 architecture, we just read/write the

 * memory location directly.

 */

#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 __raw_readb readb

#define __raw_readw readw

#define __raw_readl readl

#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 __raw_writeb writeb

#define __raw_writew writew

#define __raw_writel writel

#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))

/*

 * ISA space is 'always mapped' on a typical x86 system, no need to

 * explicitly ioremap() it. The fact that the ISA IO space is mapped

 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values

 * are physical addresses. The following constant pointer can be

 * used as the IO-area pointer (it can be iounmapped as well, so the

 * analogy with PCI is quite large):

 */

#define __ISA_IO_base ((char *)(PAGE_OFFSET))

#define isa_readb(a) readb(__ISA_IO_base + (a))

#define isa_readw(a) readw(__ISA_IO_base + (a))

#define isa_readl(a) readl(__ISA_IO_base + (a))

#define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a))

#define isa_writew(w,a) writew(w,__ISA_IO_base + (a))

#define isa_writel(l,a) writel(l,__ISA_IO_base + (a))

#define isa_memset_io(a,b,c)            memset_io(__ISA_IO_base + (a),(b),(c))

#define isa_memcpy_fromio(a,b,c)        memcpy_fromio((a),__ISA_IO_base + (b),(c))

#define isa_memcpy_toio(a,b,c)          memcpy_toio(__ISA_IO_base + (a),(b),(c))

/*

 * Again, i386 does not require mem IO specific function.

 */

#define eth_io_copy_and_sum(a,b,c,d)            eth_copy_and_sum((a),__io_virt(b),(c),(d))

#define isa_eth_io_copy_and_sum(a,b,c,d)        eth_copy_and_sum((a),__io_virt(__ISA_IO_base + (b)),(c),(d))

/**

 *      check_signature         -       find BIOS signatures

 *      @io_addr: mmio address to check

 *      @signature:  signature block

 *      @length: length of signature

 *

 *      Perform a signature comparison with the mmio address io_addr. This

 *      address should have been obtained by ioremap.

 *      Returns 1 on a match.

 */

static inline int check_signature(unsigned long io_addr,

        const unsigned char *signature, int length)

{

        int retval = 0;

        do {

                if (readb(io_addr) != *signature)

                        goto out;

                io_addr++;

                signature++;

                length--;

        } while (length);

        retval = 1;

out:

        return retval;

}

/**

 *      isa_check_signature             -       find BIOS signatures

 *      @io_addr: mmio address to check

 *      @signature:  signature block

 *      @length: length of signature

 *

 *      Perform a signature comparison with the ISA mmio address io_addr.

 *      Returns 1 on a match.

 *

 *      This function is deprecated. New drivers should use ioremap and

 *      check_signature.

 */

static inline int isa_check_signature(unsigned long io_addr,

        const unsigned char *signature, int length)

{

        int retval = 0;

        do {

                if (isa_readb(io_addr) != *signature)

                        goto out;

                io_addr++;

                signature++;

                length--;

        } while (length);

        retval = 1;

out:

        return retval;

}

/*

 *      Cache management

 *

 *      This needed for two cases

 *      1. Out of order aware processors

 *      2. Accidentally out of order processors (PPro errata #51)

 */

#if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)

static inline void flush_write_buffers(void)

{

        __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");

}

#define dma_cache_inv(_start,_size)             flush_write_buffers()

#define dma_cache_wback(_start,_size)           flush_write_buffers()

#define dma_cache_wback_inv(_start,_size)       flush_write_buffers()

#else

/* Nothing to do */

#define dma_cache_inv(_start,_size)             do { } while (0)

#define dma_cache_wback(_start,_size)           do { } while (0)

#define dma_cache_wback_inv(_start,_size)       do { } while (0)

#define flush_write_buffers()

#endif

#endif /* __KERNEL__ */

#ifdef SLOW_IO_BY_JUMPING

#define __SLOW_DOWN_IO "jmp 1f; 1: jmp 1f; 1:"

#else

#define __SLOW_DOWN_IO "outb %%al,$0x80;"

#endif

static inline void slow_down_io(void) {

        __asm__ __volatile__(

                __SLOW_DOWN_IO

#ifdef REALLY_SLOW_IO

                __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO

#endif

                : : );

}

#ifdef CONFIG_X86_NUMAQ

extern void *xquad_portio;    /* Where the IO area was mapped */

#define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)

#define __BUILDIO(bwl,bw,type) \

static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \

        if (xquad_portio) \

                write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \

        else \

                out##bwl##_local(value, port); \

} \

static inline void out##bwl(unsigned type value, int port) { \

        out##bwl##_quad(value, port, 0); \

} \

static inline unsigned type in##bwl##_quad(int port, int quad) { \

        if (xquad_portio) \

                return read##bwl(XQUAD_PORT_ADDR(port, quad)); \

        else \

                return in##bwl##_local(port); \

} \

static inline unsigned type in##bwl(int port) { \

        return in##bwl##_quad(port, 0); \

}

#else

#define __BUILDIO(bwl,bw,type) \

static inline void out##bwl(unsigned type value, int port) { \

        out##bwl##_local(value, port); \

} \

static inline unsigned type in##bwl(int port) { \

        return in##bwl##_local(port); \

}

#endif

#define BUILDIO(bwl,bw,type) \

static inline void out##bwl##_local(unsigned type value, int port) { \

        __asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \

} \

static inline unsigned type in##bwl##_local(int port) { \

        unsigned type value; \

        __asm__ __volatile__("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port)); \

        return value; \

} \

static inline void out##bwl##_local_p(unsigned type value, int port) { \

        out##bwl##_local(value, port); \

        slow_down_io(); \

} \

static inline unsigned type in##bwl##_local_p(int port) { \

        unsigned type value = in##bwl##_local(port); \

        slow_down_io(); \

        return value; \

} \

__BUILDIO(bwl,bw,type) \

static inline void out##bwl##_p(unsigned type value, int port) { \

        out##bwl(value, port); \

        slow_down_io(); \

} \

static inline unsigned type in##bwl##_p(int port) { \

        unsigned type value = in##bwl(port); \

        slow_down_io(); \

        return value; \

} \

static inline void outs##bwl(int port, const void *addr, unsigned long count) { \

        __asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \

} \

static inline void ins##bwl(int port, void *addr, unsigned long count) { \

        __asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \

}

BUILDIO(b,b,char)

BUILDIO(w,w,short)

BUILDIO(l,,int)

#endif