arch/x86/include/asm/io.h

   1 #ifndef _ASM_X86_IO_H
   2 #define _ASM_X86_IO_H
   3
   4 #define ARCH_HAS_IOREMAP_WC
   5
   6 #include <linux/compiler.h>
   7
   8 #define build_mmio_read(name, size, type, reg, barrier) \
   9 static inline type name(const volatile void __iomem *addr) \
  10 { type ret; asm volatile("mov" size " %1,%0":reg (ret) \
  11 :"m" (*(volatile type __force *)addr) barrier); return ret; }
  12
  13 #define build_mmio_write(name, size, type, reg, barrier) \
  14 static inline void name(type val, volatile void __iomem *addr) \
  15 { asm volatile("mov" size " %0,%1": :reg (val), \
  16 "m" (*(volatile type __force *)addr) barrier); }
  17
  18 build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
  19 build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
  20 build_mmio_read(readl, "l", unsigned int, "=r", :"memory")
  21
  22 build_mmio_read(__readb, "b", unsigned char, "=q", )
  23 build_mmio_read(__readw, "w", unsigned short, "=r", )
  24 build_mmio_read(__readl, "l", unsigned int, "=r", )
  25
  26 build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
  27 build_mmio_write(writew, "w", unsigned short, "r", :"memory")
  28 build_mmio_write(writel, "l", unsigned int, "r", :"memory")
  29
  30 build_mmio_write(__writeb, "b", unsigned char, "q", )
  31 build_mmio_write(__writew, "w", unsigned short, "r", )
  32 build_mmio_write(__writel, "l", unsigned int, "r", )
  33
  34 #define readb_relaxed(a) __readb(a)
  35 #define readw_relaxed(a) __readw(a)
  36 #define readl_relaxed(a) __readl(a)
  37 #define __raw_readb __readb
  38 #define __raw_readw __readw
  39 #define __raw_readl __readl
  40
  41 #define __raw_writeb __writeb
  42 #define __raw_writew __writew
  43 #define __raw_writel __writel
  44
  45 #define mmiowb() barrier()
  46
  47 #ifdef CONFIG_X86_64
  48 build_mmio_read(readq, "q", unsigned long, "=r", :"memory")
  49 build_mmio_read(__readq, "q", unsigned long, "=r", )
  50 build_mmio_write(writeq, "q", unsigned long, "r", :"memory")
  51 build_mmio_write(__writeq, "q", unsigned long, "r", )
  52
  53 #define readq_relaxed(a) __readq(a)
  54 #define __raw_readq __readq
  55 #define __raw_writeq writeq
  56
  57 /* Let people know we have them */
  58 #define readq readq
  59 #define writeq writeq
  60 #endif
  61
  62 extern int iommu_bio_merge;
  63
  64 #ifdef CONFIG_X86_32
  65 # include "io_32.h"
  66 #else
  67 # include "io_64.h"
  68 #endif
  69
  70 extern void *xlate_dev_mem_ptr(unsigned long phys);
  71 extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
  72
  73 extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
  74                                 unsigned long prot_val);
  75 extern void __iomem *ioremap_wc(unsigned long offset, unsigned long size);
  76
  77 /*
  78  * early_ioremap() and early_iounmap() are for temporary early boot-time
  79  * mappings, before the real ioremap() is functional.
  80  * A boot-time mapping is currently limited to at most 16 pages.
  81  */
  82 extern void early_ioremap_init(void);
  83 extern void early_ioremap_clear(void);
  84 extern void early_ioremap_reset(void);
  85 extern void __iomem *early_ioremap(unsigned long offset, unsigned long size);
  86 extern void __iomem *early_memremap(unsigned long offset, unsigned long size);
  87 extern void early_iounmap(void __iomem *addr, unsigned long size);
  88 extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
  89
  90
  91 #endif /* _ASM_X86_IO_H */