arch/x86/include/asm/io.h - arm/linux-arm64-legacy - Git at Google

 #ifndef _ASM_X86_IO_H
 #define _ASM_X86_IO_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 ARCH_HAS_IOREMAP_WC

 #include <linux/string.h>
 #include <linux/compiler.h>
 #include <asm/page.h>
 #include <asm/early_ioremap.h>

 #define build_mmio_read(name, size, type, reg, barrier) \
 static inline type name(const volatile void __iomem *addr) \
 { type ret; asm volatile("mov" size " %1,%0":reg (ret) \
 :"m" (*(volatile type __force *)addr) barrier); return ret; }

 #define build_mmio_write(name, size, type, reg, barrier) \
 static inline void name(type val, volatile void __iomem *addr) \
 { asm volatile("mov" size " %0,%1": :reg (val), \
 "m" (*(volatile type __force *)addr) barrier); }

 build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
 build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
 build_mmio_read(readl, "l", unsigned int, "=r", :"memory")

 build_mmio_read(__readb, "b", unsigned char, "=q", )
 build_mmio_read(__readw, "w", unsigned short, "=r", )
 build_mmio_read(__readl, "l", unsigned int, "=r", )

 build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
 build_mmio_write(writew, "w", unsigned short, "r", :"memory")
 build_mmio_write(writel, "l", unsigned int, "r", :"memory")

 build_mmio_write(__writeb, "b", unsigned char, "q", )
 build_mmio_write(__writew, "w", unsigned short, "r", )
 build_mmio_write(__writel, "l", unsigned int, "r", )

 #define readb_relaxed(a) __readb(a)
 #define readw_relaxed(a) __readw(a)
 #define readl_relaxed(a) __readl(a)
 #define __raw_readb __readb
 #define __raw_readw __readw
 #define __raw_readl __readl

 #define __raw_writeb __writeb
 #define __raw_writew __writew
 #define __raw_writel __writel

 #define mmiowb() barrier()

 #ifdef CONFIG_X86_64

 build_mmio_read(readq, "q", unsigned long, "=r", :"memory")
 build_mmio_write(writeq, "q", unsigned long, "r", :"memory")

 #define readq_relaxed(a)	readq(a)

 #define __raw_readq(a)		readq(a)
 #define __raw_writeq(val, addr)	writeq(val, addr)

 /* Let people know that we have them */
 #define readq			readq
 #define writeq			writeq

 #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 phys_addr_t 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(phys_addr_t address)
 {
 	return __va(address);
 }

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

 /*
  * ISA I/O bus memory addresses are 1:1 with the physical address.
  * However, we truncate the address to unsigned int to avoid undesirable
  * promitions in legacy drivers.
  */
 static inline unsigned int isa_virt_to_bus(volatile void *address)
 {
 	return (unsigned int)virt_to_phys(address);
 }
 #define isa_page_to_bus(page)	((unsigned int)page_to_phys(page))
 #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

 /**
  * 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.
  *
  * If the area you are trying to map is a PCI BAR you should have a
  * look at pci_iomap().
  */
 extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
 extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
 extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
 				unsigned long prot_val);

 /*
  * The default ioremap() behavior is non-cached:
  */
 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
 {
 	return ioremap_nocache(offset, size);
 }

 extern void iounmap(volatile void __iomem *addr);

 extern void set_iounmap_nonlazy(void);

 #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

 static inline void
 memset_io(volatile void __iomem *addr, unsigned char val, size_t count)
 {
 	memset((void __force *)addr, val, count);
 }

 static inline void
 memcpy_fromio(void *dst, const volatile void __iomem *src, size_t count)
 {
 	memcpy(dst, (const void __force *)src, count);
 }

 static inline void
 memcpy_toio(volatile void __iomem *dst, const void *src, size_t count)
 {
 	memcpy((void __force *)dst, src, count);
 }

 /*
  * 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)
  */

 static inline void flush_write_buffers(void)
 {
 #if defined(CONFIG_X86_PPRO_FENCE)
 	asm volatile("lock; addl $0,0(%%esp)": : :"memory");
 #endif
 }

 #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

 #define BUILDIO(bwl, bw, type)						\
 static inline void out##bwl(unsigned type value, int port)		\
 {									\
 	asm volatile("out" #bwl " %" #bw "0, %w1"			\
 		     : : "a"(value), "Nd"(port));			\
 }									\
 									\
 static inline unsigned type in##bwl(int port)				\
 {									\
 	unsigned type value;						\
 	asm volatile("in" #bwl " %w1, %" #bw "0"			\
 		     : "=a"(value) : "Nd"(port));			\
 	return value;							\
 }									\
 									\
 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)

 extern void *xlate_dev_mem_ptr(unsigned long phys);
 extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);

 extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
 				unsigned long prot_val);
 extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);

 extern bool is_early_ioremap_ptep(pte_t *ptep);

 #ifdef CONFIG_XEN
 #include <xen/xen.h>
 struct bio_vec;

 extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
 				      const struct bio_vec *vec2);

 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2)				\
 	(__BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&				\
 	 (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2)))
 #endif	/* CONFIG_XEN */

 #define IO_SPACE_LIMIT 0xffff

 #ifdef CONFIG_MTRR
 extern int __must_check arch_phys_wc_add(unsigned long base,
 					 unsigned long size);
 extern void arch_phys_wc_del(int handle);
 #define arch_phys_wc_add arch_phys_wc_add
 #endif

 #endif /* _ASM_X86_IO_H */
	#ifndef _ASM_X86_IO_H
	#define _ASM_X86_IO_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 ARCH_HAS_IOREMAP_WC

	#include <linux/string.h>
	#include <linux/compiler.h>
	#include <asm/page.h>
	#include <asm/early_ioremap.h>

	#define build_mmio_read(name, size, type, reg, barrier) \
	static inline type name(const volatile void __iomem *addr) \
	{ type ret; asm volatile("mov" size " %1,%0":reg (ret) \
	:"m" ((volatile type __force )addr) barrier); return ret; }

	#define build_mmio_write(name, size, type, reg, barrier) \
	static inline void name(type val, volatile void __iomem *addr) \
	{ asm volatile("mov" size " %0,%1": :reg (val), \
	"m" ((volatile type __force )addr) barrier); }

	build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
	build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
	build_mmio_read(readl, "l", unsigned int, "=r", :"memory")

	build_mmio_read(__readb, "b", unsigned char, "=q", )
	build_mmio_read(__readw, "w", unsigned short, "=r", )
	build_mmio_read(__readl, "l", unsigned int, "=r", )

	build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
	build_mmio_write(writew, "w", unsigned short, "r", :"memory")
	build_mmio_write(writel, "l", unsigned int, "r", :"memory")

	build_mmio_write(__writeb, "b", unsigned char, "q", )
	build_mmio_write(__writew, "w", unsigned short, "r", )
	build_mmio_write(__writel, "l", unsigned int, "r", )

	#define readb_relaxed(a) __readb(a)
	#define readw_relaxed(a) __readw(a)
	#define readl_relaxed(a) __readl(a)
	#define __raw_readb __readb
	#define __raw_readw __readw
	#define __raw_readl __readl

	#define __raw_writeb __writeb
	#define __raw_writew __writew
	#define __raw_writel __writel

	#define mmiowb() barrier()

	#ifdef CONFIG_X86_64

	build_mmio_read(readq, "q", unsigned long, "=r", :"memory")
	build_mmio_write(writeq, "q", unsigned long, "r", :"memory")

	#define readq_relaxed(a) readq(a)

	#define __raw_readq(a) readq(a)
	#define __raw_writeq(val, addr) writeq(val, addr)

	/* Let people know that we have them */
	#define readq readq
	#define writeq writeq

	#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 phys_addr_t 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(phys_addr_t address)
	{
	return __va(address);
	}

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

	/*
	* ISA I/O bus memory addresses are 1:1 with the physical address.
	* However, we truncate the address to unsigned int to avoid undesirable
	* promitions in legacy drivers.
	*/
	static inline unsigned int isa_virt_to_bus(volatile void *address)
	{
	return (unsigned int)virt_to_phys(address);
	}
	#define isa_page_to_bus(page) ((unsigned int)page_to_phys(page))
	#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

	/**
	* 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.
	*
	* If the area you are trying to map is a PCI BAR you should have a
	* look at pci_iomap().
	*/
	extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
	extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
	extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
	unsigned long prot_val);

	/*
	* The default ioremap() behavior is non-cached:
	*/
	static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
	{
	return ioremap_nocache(offset, size);
	}

	extern void iounmap(volatile void __iomem *addr);

	extern void set_iounmap_nonlazy(void);

	#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

	static inline void
	memset_io(volatile void __iomem *addr, unsigned char val, size_t count)
	{
	memset((void __force *)addr, val, count);
	}

	static inline void
	memcpy_fromio(void dst, const volatile void __iomem src, size_t count)
	{
	memcpy(dst, (const void __force *)src, count);
	}

	static inline void
	memcpy_toio(volatile void __iomem dst, const void src, size_t count)
	{
	memcpy((void __force *)dst, src, count);
	}

	/*
	* 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)
	*/

	static inline void flush_write_buffers(void)
	{
	#if defined(CONFIG_X86_PPRO_FENCE)
	asm volatile("lock; addl $0,0(%%esp)": : :"memory");
	#endif
	}

	#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

	#define BUILDIO(bwl, bw, type) \
	static inline void out##bwl(unsigned type value, int port) \
	{ \
	asm volatile("out" #bwl " %" #bw "0, %w1" \
	: : "a"(value), "Nd"(port)); \
	} \
	\
	static inline unsigned type in##bwl(int port) \
	{ \
	unsigned type value; \
	asm volatile("in" #bwl " %w1, %" #bw "0" \
	: "=a"(value) : "Nd"(port)); \
	return value; \
	} \
	\
	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)

	extern void *xlate_dev_mem_ptr(unsigned long phys);
	extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);

	extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
	unsigned long prot_val);
	extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);

	extern bool is_early_ioremap_ptep(pte_t *ptep);

	#ifdef CONFIG_XEN
	#include <xen/xen.h>
	struct bio_vec;

	extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
	const struct bio_vec *vec2);

	#define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
	(__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \
	(!xen_domain() \|\| xen_biovec_phys_mergeable(vec1, vec2)))
	#endif /* CONFIG_XEN */

	#define IO_SPACE_LIMIT 0xffff

	#ifdef CONFIG_MTRR
	extern int __must_check arch_phys_wc_add(unsigned long base,
	unsigned long size);
	extern void arch_phys_wc_del(int handle);
	#define arch_phys_wc_add arch_phys_wc_add
	#endif

	#endif /* _ASM_X86_IO_H */