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#ifndef _ASM_X86_IO_64_H
#define _ASM_X86_IO_64_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>
*/
#ifdef __KERNEL__
#include <asm-generic/iomap.h>
#include <linux/vmalloc.h>
/*
* Convert a virtual cached pointer to an uncached pointer
*/
#define xlate_dev_kmem_ptr(p) p
void memset_io(volatile void __iomem *a, int b, size_t c);
void __memcpy_fromio(void *, unsigned long, unsigned);
static inline void memcpy_fromio(void *to, const volatile void __iomem *from,
unsigned len)
{
__memcpy_fromio(to, (unsigned long)from, len);
}
void __memcpy_toio(unsigned long, const void *, unsigned);
static inline void memcpy_toio(volatile void __iomem *to, const void *from,
unsigned len)
{
__memcpy_toio((unsigned long)to, from, len);
}
/*
* 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 __iomem *)(PAGE_OFFSET))
/*
* Cache management
*
* This needed for two cases
* 1. Out of order aware processors
* 2. Accidentally out of order processors (PPro errata #51)
*/
#define flush_write_buffers() do { } while (0)
#endif /* __KERNEL__ */
extern void native_io_delay(void);
extern int io_delay_type;
extern void io_delay_init(void);
#if defined(CONFIG_PARAVIRT)
#include <asm/paravirt.h>
#else
static inline void slow_down_io(void)
{
native_io_delay();
#ifdef REALLY_SLOW_IO
native_io_delay();
native_io_delay();
native_io_delay();
#endif
}
#endif
/*
* Talk about misusing macros..
*/
#define __OUT1(s, x) \
static inline void out##s(unsigned x value, unsigned short port) {
#define __OUT2(s, s1, s2) \
asm volatile ("out" #s " %" s1 "0,%" s2 "1"
#ifndef REALLY_SLOW_IO
#define REALLY_SLOW_IO
#define UNSET_REALLY_SLOW_IO
#endif
#define __OUT(s, s1, x) \
__OUT1(s, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port)); \
} \
__OUT1(s##_p, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port)); \
slow_down_io(); \
}
#define __IN1(s) \
static inline RETURN_TYPE in##s(unsigned short port) \
{ \
RETURN_TYPE _v;
#define __IN2(s, s1, s2) \
asm volatile ("in" #s " %" s2 "1,%" s1 "0"
#define __IN(s, s1, i...) \
__IN1(s) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i); \
return _v; \
} \
__IN1(s##_p) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i); \
slow_down_io(); \
return _v; }
#ifdef UNSET_REALLY_SLOW_IO
#undef REALLY_SLOW_IO
#endif
#define __INS(s) \
static inline void ins##s(unsigned short port, void *addr, \
unsigned long count) \
{ \
asm volatile ("rep ; ins" #s \
: "=D" (addr), "=c" (count) \
: "d" (port), "0" (addr), "1" (count)); \
}
#define __OUTS(s) \
static inline void outs##s(unsigned short port, const void *addr, \
unsigned long count) \
{ \
asm volatile ("rep ; outs" #s \
: "=S" (addr), "=c" (count) \
: "d" (port), "0" (addr), "1" (count)); \
}
#define RETURN_TYPE unsigned char
__IN(b, "")
#undef RETURN_TYPE
#define RETURN_TYPE unsigned short
__IN(w, "")
#undef RETURN_TYPE
#define RETURN_TYPE unsigned int
__IN(l, "")
#undef RETURN_TYPE
__OUT(b, "b", char)
__OUT(w, "w", short)
__OUT(l, , int)
__INS(b)
__INS(w)
__INS(l)
__OUTS(b)
__OUTS(w)
__OUTS(l)
#endif /* _ASM_X86_IO_64_H */
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