include/asm-x86/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 /*
   9  * early_ioremap() and early_iounmap() are for temporary early boot-time
  10  * mappings, before the real ioremap() is functional.
  11  * A boot-time mapping is currently limited to at most 16 pages.
  12  */
  13 #ifndef __ASSEMBLY__
  14 extern void early_ioremap_init(void);
  15 extern void early_ioremap_clear(void);
  16 extern void early_ioremap_reset(void);
  17 extern void *early_ioremap(unsigned long offset, unsigned long size);
  18 extern void early_iounmap(void *addr, unsigned long size);
  19 extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
  20 #endif
  21
  22 #define build_mmio_read(name, size, type, reg, barrier) \
  23 static inline type name(const volatile void __iomem *addr) \
  24 { type ret; asm volatile("mov" size " %1,%0":"=" reg (ret) \
  25 :"m" (*(volatile type __force *)addr) barrier); return ret; }
  26
  27 #define build_mmio_write(name, size, type, reg, barrier) \
  28 static inline void name(type val, volatile void __iomem *addr) \
  29 { asm volatile("mov" size " %0,%1": :reg (val), \
  30 "m" (*(volatile type __force *)addr) barrier); }
  31
  32 build_mmio_read(readb, "b", unsigned char, "q", :"memory")
  33 build_mmio_read(readw, "w", unsigned short, "r", :"memory")
  34 build_mmio_read(readl, "l", unsigned int, "r", :"memory")
  35
  36 build_mmio_read(__readb, "b", unsigned char, "q", )
  37 build_mmio_read(__readw, "w", unsigned short, "r", )
  38 build_mmio_read(__readl, "l", unsigned int, "r", )
  39
  40 build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
  41 build_mmio_write(writew, "w", unsigned short, "r", :"memory")
  42 build_mmio_write(writel, "l", unsigned int, "r", :"memory")
  43
  44 build_mmio_write(__writeb, "b", unsigned char, "q", )
  45 build_mmio_write(__writew, "w", unsigned short, "r", )
  46 build_mmio_write(__writel, "l", unsigned int, "r", )
  47
  48 #define readb_relaxed(a) __readb(a)
  49 #define readw_relaxed(a) __readw(a)
  50 #define readl_relaxed(a) __readl(a)
  51 #define __raw_readb __readb
  52 #define __raw_readw __readw
  53 #define __raw_readl __readl
  54
  55 #define __raw_writeb __writeb
  56 #define __raw_writew __writew
  57 #define __raw_writel __writel
  58
  59 #define mmiowb() barrier()
  60
  61 #ifdef CONFIG_X86_64
  62 build_mmio_read(readq, "q", unsigned long, "r", :"memory")
  63 build_mmio_read(__readq, "q", unsigned long, "r", )
  64 build_mmio_write(writeq, "q", unsigned long, "r", :"memory")
  65 build_mmio_write(__writeq, "q", unsigned long, "r", )
  66
  67 #define readq_relaxed(a) __readq(a)
  68 #define __raw_readq __readq
  69 #define __raw_writeq writeq
  70
  71 /* Let people know we have them */
  72 #define readq readq
  73 #define writeq writeq
  74 #endif
  75
  76 #ifdef CONFIG_X86_32
  77 # include "io_32.h"
  78 #else
  79 # include "io_64.h"
  80 #endif
  81
  82 extern void *xlate_dev_mem_ptr(unsigned long phys);
  83 extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
  84
  85 extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
  86                                 unsigned long prot_val);
  87 extern void __iomem *ioremap_wc(unsigned long offset, unsigned long size);
  88
  89 /*
  90  * early_ioremap() and early_iounmap() are for temporary early boot-time
  91  * mappings, before the real ioremap() is functional.
  92  * A boot-time mapping is currently limited to at most 16 pages.
  93  */
  94 extern void early_ioremap_init(void);
  95 extern void early_ioremap_clear(void);
  96 extern void early_ioremap_reset(void);
  97 extern void *early_ioremap(unsigned long offset, unsigned long size);
  98 extern void early_iounmap(void *addr, unsigned long size);
  99 extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
 100
 101
 102 #endif /* ASM_X86__IO_H */