include/asm-x86_64/io.h - kernel/msm - Gitiles

 #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 __SLOW_DOWN_IO "\noutb %%al,$0x80"

 #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

 __OUT(b,"b",char)
 __OUT(w,"w",short)
 __OUT(l,,int)

 __INS(b)
 __INS(w)
 __INS(l)

 __OUTS(b)
 __OUTS(w)
 __OUTS(l)

 #define IO_SPACE_LIMIT 0xffff

 #if defined(__KERNEL__) && __x86_64__

 #include <linux/vmalloc.h>

 #ifndef __i386__
 /*
  * Change virtual addresses to physical addresses and vv.
  * These are pretty trivial
  */
 static inline unsigned long virt_to_phys(volatile void * address)
 {
 	return __pa(address);
 }

 static inline void * phys_to_virt(unsigned long address)
 {
 	return __va(address);
 }
 #endif

 /*
  * Change "struct page" to physical address.
  */
 #define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)

 #include <asm-generic/iomap.h>

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

 static inline void __iomem * 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 void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
 extern void iounmap(volatile void __iomem *addr);

 /* Use normal IO mappings for DMI */
 #define dmi_ioremap ioremap
 #define dmi_iounmap(x,l) iounmap(x)
 #define dmi_alloc(l) kmalloc(l, GFP_ATOMIC)

 /*
  * 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.
  */

 static inline __u8 __readb(const volatile void __iomem *addr)
 {
 	return *(__force volatile __u8 *)addr;
 }
 static inline __u16 __readw(const volatile void __iomem *addr)
 {
 	return *(__force volatile __u16 *)addr;
 }
 static inline __u32 __readl(const volatile void __iomem *addr)
 {
 	return *(__force volatile __u32 *)addr;
 }
 static inline __u64 __readq(const volatile void __iomem *addr)
 {
 	return *(__force volatile __u64 *)addr;
 }
 #define readb(x) __readb(x)
 #define readw(x) __readw(x)
 #define readl(x) __readl(x)
 #define readq(x) __readq(x)
 #define readb_relaxed(a) readb(a)
 #define readw_relaxed(a) readw(a)
 #define readl_relaxed(a) readl(a)
 #define readq_relaxed(a) readq(a)
 #define __raw_readb readb
 #define __raw_readw readw
 #define __raw_readl readl
 #define __raw_readq readq

 #define mmiowb()

 #ifdef CONFIG_UNORDERED_IO
 static inline void __writel(__u32 val, volatile void __iomem *addr)
 {
 	volatile __u32 __iomem *target = addr;
 	asm volatile("movnti %1,%0"
 		     : "=m" (*target)
 		     : "r" (val) : "memory");
 }

 static inline void __writeq(__u64 val, volatile void __iomem *addr)
 {
 	volatile __u64 __iomem *target = addr;
 	asm volatile("movnti %1,%0"
 		     : "=m" (*target)
 		     : "r" (val) : "memory");
 }
 #else
 static inline void __writel(__u32 b, volatile void __iomem *addr)
 {
 	*(__force volatile __u32 *)addr = b;
 }
 static inline void __writeq(__u64 b, volatile void __iomem *addr)
 {
 	*(__force volatile __u64 *)addr = b;
 }
 #endif
 static inline void __writeb(__u8 b, volatile void __iomem *addr)
 {
 	*(__force volatile __u8 *)addr = b;
 }
 static inline void __writew(__u16 b, volatile void __iomem *addr)
 {
 	*(__force volatile __u16 *)addr = b;
 }
 #define writeq(val,addr) __writeq((val),(addr))
 #define writel(val,addr) __writel((val),(addr))
 #define writew(val,addr) __writew((val),(addr))
 #define writeb(val,addr) __writeb((val),(addr))
 #define __raw_writeb writeb
 #define __raw_writew writew
 #define __raw_writel writel
 #define __raw_writeq writeq

 void __memcpy_fromio(void*,unsigned long,unsigned);
 void __memcpy_toio(unsigned long,const void*,unsigned);

 static inline void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned len)
 {
 	__memcpy_fromio(to,(unsigned long)from,len);
 }
 static inline void memcpy_toio(volatile void __iomem *to, const void *from, unsigned len)
 {
 	__memcpy_toio((unsigned long)to,from,len);
 }

 void memset_io(volatile void __iomem *a, int b, size_t 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 __iomem *)(PAGE_OFFSET))

 /*
  * Again, x86-64 does not require mem IO specific function.
  */

 #define eth_io_copy_and_sum(a,b,c,d)		eth_copy_and_sum((a),(void *)(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(void __iomem *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;
 }

 /* 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()

 extern int iommu_bio_merge;
 #define BIO_VMERGE_BOUNDARY iommu_bio_merge

 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
  */
 #define xlate_dev_mem_ptr(p)	__va(p)

 /*
  * Convert a virtual cached pointer to an uncached pointer
  */
 #define xlate_dev_kmem_ptr(p)	p

 #endif /* __KERNEL__ */

 #endif
	#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 __SLOW_DOWN_IO "\noutb %%al,$0x80"

	#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

	__OUT(b,"b",char)
	__OUT(w,"w",short)
	__OUT(l,,int)

	__INS(b)
	__INS(w)
	__INS(l)

	__OUTS(b)
	__OUTS(w)
	__OUTS(l)

	#define IO_SPACE_LIMIT 0xffff

	#if defined(__KERNEL__) && __x86_64__

	#include <linux/vmalloc.h>

	#ifndef __i386__
	/*
	* Change virtual addresses to physical addresses and vv.
	* These are pretty trivial
	*/
	static inline unsigned long virt_to_phys(volatile void * address)
	{
	return __pa(address);
	}

	static inline void * phys_to_virt(unsigned long address)
	{
	return __va(address);
	}
	#endif

	/*
	* Change "struct page" to physical address.
	*/
	#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)

	#include <asm-generic/iomap.h>

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

	static inline void __iomem * 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 void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
	extern void iounmap(volatile void __iomem *addr);

	/* Use normal IO mappings for DMI */
	#define dmi_ioremap ioremap
	#define dmi_iounmap(x,l) iounmap(x)
	#define dmi_alloc(l) kmalloc(l, GFP_ATOMIC)

	/*
	* 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.
	*/

	static inline __u8 __readb(const volatile void __iomem *addr)
	{
	return (__force volatile __u8 )addr;
	}
	static inline __u16 __readw(const volatile void __iomem *addr)
	{
	return (__force volatile __u16 )addr;
	}
	static inline __u32 __readl(const volatile void __iomem *addr)
	{
	return (__force volatile __u32 )addr;
	}
	static inline __u64 __readq(const volatile void __iomem *addr)
	{
	return (__force volatile __u64 )addr;
	}
	#define readb(x) __readb(x)
	#define readw(x) __readw(x)
	#define readl(x) __readl(x)
	#define readq(x) __readq(x)
	#define readb_relaxed(a) readb(a)
	#define readw_relaxed(a) readw(a)
	#define readl_relaxed(a) readl(a)
	#define readq_relaxed(a) readq(a)
	#define __raw_readb readb
	#define __raw_readw readw
	#define __raw_readl readl
	#define __raw_readq readq

	#define mmiowb()

	#ifdef CONFIG_UNORDERED_IO
	static inline void __writel(__u32 val, volatile void __iomem *addr)
	{
	volatile __u32 __iomem *target = addr;
	asm volatile("movnti %1,%0"
	: "=m" (*target)
	: "r" (val) : "memory");
	}

	static inline void __writeq(__u64 val, volatile void __iomem *addr)
	{
	volatile __u64 __iomem *target = addr;
	asm volatile("movnti %1,%0"
	: "=m" (*target)
	: "r" (val) : "memory");
	}
	#else
	static inline void __writel(__u32 b, volatile void __iomem *addr)
	{
	(__force volatile __u32 )addr = b;
	}
	static inline void __writeq(__u64 b, volatile void __iomem *addr)
	{
	(__force volatile __u64 )addr = b;
	}
	#endif
	static inline void __writeb(__u8 b, volatile void __iomem *addr)
	{
	(__force volatile __u8 )addr = b;
	}
	static inline void __writew(__u16 b, volatile void __iomem *addr)
	{
	(__force volatile __u16 )addr = b;
	}
	#define writeq(val,addr) __writeq((val),(addr))
	#define writel(val,addr) __writel((val),(addr))
	#define writew(val,addr) __writew((val),(addr))
	#define writeb(val,addr) __writeb((val),(addr))
	#define __raw_writeb writeb
	#define __raw_writew writew
	#define __raw_writel writel
	#define __raw_writeq writeq

	void __memcpy_fromio(void*,unsigned long,unsigned);
	void __memcpy_toio(unsigned long,const void*,unsigned);

	static inline void memcpy_fromio(void to, const volatile void __iomem from, unsigned len)
	{
	__memcpy_fromio(to,(unsigned long)from,len);
	}
	static inline void memcpy_toio(volatile void __iomem to, const void from, unsigned len)
	{
	__memcpy_toio((unsigned long)to,from,len);
	}

	void memset_io(volatile void __iomem *a, int b, size_t 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 __iomem *)(PAGE_OFFSET))

	/*
	* Again, x86-64 does not require mem IO specific function.
	*/

	#define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(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(void __iomem *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;
	}

	/* 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()

	extern int iommu_bio_merge;
	#define BIO_VMERGE_BOUNDARY iommu_bio_merge

	/*
	* Convert a physical pointer to a virtual kernel pointer for /dev/mem
	* access
	*/
	#define xlate_dev_mem_ptr(p) __va(p)

	/*
	* Convert a virtual cached pointer to an uncached pointer
	*/
	#define xlate_dev_kmem_ptr(p) p

	#endif /* __KERNEL__ */

	#endif