arch/x86/include/asm/io.h - platform/external/u-boot - Gitiles

 /*
  * (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 */
	/*
	* (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 */