text: /*
   * (C) Copyright 2000-2002
   * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #ifndef _ASM_IO_H
  #define _ASM_IO_H
  
  #include <linux/compiler.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
  
  #include <asm/types.h>
  
  
  #ifdef __KERNEL__
  
  
  /*
   * 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 *) (addr))
  #define readw(addr) (*(volatile unsigned short *) (addr))
  #define readl(addr) (*(volatile unsigned int *) (addr))
  #define readq(addr) (*(volatile unsigned long long *) (addr))
  #define __raw_readb readb
  #define __raw_readw readw
  #define __raw_readl readl
  #define __raw_readq readq
  
  #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
  #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
  #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
  #define writeq(b,addr) (*(volatile unsigned long long *) (addr) = (b))
  #define __raw_writeb writeb
  #define __raw_writew writew
  #define __raw_writel writel
  #define __raw_writeq writeq
  
  #define memset_io(a,b,c)	memset((a),(b),(c))
  #define memcpy_fromio(a,b,c)	memcpy((a),(b),(c))
  #define memcpy_toio(a,b,c)	memcpy((a),(b),(c))
  
  #define out_arch(type, endian, a, v)	__raw_write##type(cpu_to_##endian(v), a)
  #define in_arch(type, endian, a)	endian##_to_cpu(__raw_read##type(a))
  
  #define out_le64(a, v)	out_arch(q, le64, a, v)
  #define out_le32(a, v)	out_arch(l, le32, a, v)
  #define out_le16(a, v)	out_arch(w, le16, a, v)
  
  #define in_le64(a)	in_arch(q, le64, a)
  #define in_le32(a)	in_arch(l, le32, a)
  #define in_le16(a)	in_arch(w, le16, a)
  
  #define out_be32(a, v)	out_arch(l, be32, a, v)
  #define out_be16(a, v)	out_arch(w, be16, a, v)
  
  #define in_be32(a)	in_arch(l, be32, a)
  #define in_be16(a)	in_arch(w, be16, a)
  
  #define out_8(a, v)	__raw_writeb(v, a)
  #define in_8(a)		__raw_readb(a)
  
  #define clrbits(type, addr, clear) \
  	out_##type((addr), in_##type(addr) & ~(clear))
  
  #define setbits(type, addr, set) \
  	out_##type((addr), in_##type(addr) | (set))
  
  #define clrsetbits(type, addr, clear, set) \
  	out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
  
  #define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
  #define setbits_be32(addr, set) setbits(be32, addr, set)
  #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
  
  #define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
  #define setbits_le32(addr, set) setbits(le32, addr, set)
  #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
  
  #define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
  #define setbits_be16(addr, set) setbits(be16, addr, set)
  #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
  
  #define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
  #define setbits_le16(addr, set) setbits(le16, addr, set)
  #define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
  
  #define clrbits_8(addr, clear) clrbits(8, addr, clear)
  #define setbits_8(addr, set) setbits(8, addr, set)
  #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
  
  #endif /* __KERNEL__ */
  
  #ifdef SLOW_IO_BY_JUMPING
  #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
  #else
  #define __SLOW_DOWN_IO "\noutb %%al,$0xed"
  #endif
  
  #ifdef REALLY_SLOW_IO
  #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
  #else
  #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
  #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"
  
  
  #define __OUT(s,s1,x) \
  __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
  __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
  
  #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") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
  
  #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
  
  #define inb(port)	_inb((uintptr_t)(port))
  #define inw(port)	_inw((uintptr_t)(port))
  #define inl(port)	_inl((uintptr_t)(port))
  
  __OUT(b,"b",char)
  __OUT(w,"w",short)
  __OUT(l,,int)
  
  #define outb(val, port)	_outb(val, (uintptr_t)(port))
  #define outw(val, port)	_outw(val, (uintptr_t)(port))
  #define outl(val, port)	_outl(val, (uintptr_t)(port))
  
  __INS(b)
  __INS(w)
  __INS(l)
  
  __OUTS(b)
  __OUTS(w)
  __OUTS(l)
  
  /* IO space accessors */
  #define clrio(type, addr, clear) \
  	out##type(in##type(addr) & ~(clear), (addr))
  
  #define setio(type, addr, set) \
  	out##type(in##type(addr) | (set), (addr))
  
  #define clrsetio(type, addr, clear, set) \
  	out##type((in##type(addr) & ~(clear)) | (set), (addr))
  
  #define clrio_32(addr, clear) clrio(l, addr, clear)
  #define clrio_16(addr, clear) clrio(w, addr, clear)
  #define clrio_8(addr, clear) clrio(b, addr, clear)
  
  #define setio_32(addr, set) setio(l, addr, set)
  #define setio_16(addr, set) setio(w, addr, set)
  #define setio_8(addr, set) setio(b, addr, set)
  
  #define clrsetio_32(addr, clear, set) clrsetio(l, addr, clear, set)
  #define clrsetio_16(addr, clear, set) clrsetio(w, addr, clear, set)
  #define clrsetio_8(addr, clear, set) clrsetio(b, addr, clear, set)
  
  static inline void sync(void)
  {
  }
  
  /*
   * TODO: The kernel offers some more advanced versions of barriers, it might
   * have some advantages to use them instead of the simple one here.
   */
  #define dmb()		__asm__ __volatile__ ("" : : : "memory")
  #define __iormb()	dmb()
  #define __iowmb()	dmb()
  
  #include <asm-generic/io.h>
  
  #endif /* _ASM_IO_H */
  