include/asm-x86_64/io.h

   1 #ifndef _ASM_IO_H
   2 #define _ASM_IO_H
   3
   4
   5 /*
   6  * This file contains the definitions for the x86 IO instructions
   7  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
   8  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
   9  * versions of the single-IO instructions (inb_p/inw_p/..).
  10  *
  11  * This file is not meant to be obfuscating: it's just complicated
  12  * to (a) handle it all in a way that makes gcc able to optimize it
  13  * as well as possible and (b) trying to avoid writing the same thing
  14  * over and over again with slight variations and possibly making a
  15  * mistake somewhere.
  16  */
  17
  18 /*
  19  * Thanks to James van Artsdalen for a better timing-fix than
  20  * the two short jumps: using outb's to a nonexistent port seems
  21  * to guarantee better timings even on fast machines.
  22  *
  23  * On the other hand, I'd like to be sure of a non-existent port:
  24  * I feel a bit unsafe about using 0x80 (should be safe, though)
  25  *
  26  *              Linus
  27  */
  28
  29  /*
  30   *  Bit simplified and optimized by Jan Hubicka
  31   *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
  32   *
  33   *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
  34   *  isa_read[wl] and isa_write[wl] fixed
  35   *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  36   */
  37
  38 #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
  39
  40 #ifdef REALLY_SLOW_IO
  41 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
  42 #else
  43 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
  44 #endif
  45
  46 /*
  47  * Talk about misusing macros..
  48  */
  49 #define __OUT1(s,x) \
  50 static inline void out##s(unsigned x value, unsigned short port) {
  51
  52 #define __OUT2(s,s1,s2) \
  53 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
  54
  55 #define __OUT(s,s1,x) \
  56 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
  57 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \
  58
  59 #define __IN1(s) \
  60 static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
  61
  62 #define __IN2(s,s1,s2) \
  63 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
  64
  65 #define __IN(s,s1,i...) \
  66 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
  67 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
  68
  69 #define __INS(s) \
  70 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
  71 { __asm__ __volatile__ ("rep ; ins" #s \
  72 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
  73
  74 #define __OUTS(s) \
  75 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
  76 { __asm__ __volatile__ ("rep ; outs" #s \
  77 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
  78
  79 #define RETURN_TYPE unsigned char
  80 __IN(b,"")
  81 #undef RETURN_TYPE
  82 #define RETURN_TYPE unsigned short
  83 __IN(w,"")
  84 #undef RETURN_TYPE
  85 #define RETURN_TYPE unsigned int
  86 __IN(l,"")
  87 #undef RETURN_TYPE
  88
  89 __OUT(b,"b",char)
  90 __OUT(w,"w",short)
  91 __OUT(l,,int)
  92
  93 __INS(b)
  94 __INS(w)
  95 __INS(l)
  96
  97 __OUTS(b)
  98 __OUTS(w)
  99 __OUTS(l)
 100
 101 #define IO_SPACE_LIMIT 0xffff
 102
 103 #if defined(__KERNEL__) && defined(__x86_64__)
 104
 105 #include <linux/vmalloc.h>
 106
 107 #ifndef __i386__
 108 /*
 109  * Change virtual addresses to physical addresses and vv.
 110  * These are pretty trivial
 111  */
 112 static inline unsigned long virt_to_phys(volatile void * address)
 113 {
 114         return __pa(address);
 115 }
 116
 117 static inline void * phys_to_virt(unsigned long address)
 118 {
 119         return __va(address);
 120 }
 121 #endif
 122
 123 /*
 124  * Change "struct page" to physical address.
 125  */
 126 #define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
 127
 128 #include <asm-generic/iomap.h>
 129
 130 extern void __iomem *__ioremap(unsigned long offset, unsigned long size, unsigned long flags);
 131
 132 static inline void __iomem * ioremap (unsigned long offset, unsigned long size)
 133 {
 134         return __ioremap(offset, size, 0);
 135 }
 136
 137 extern void *early_ioremap(unsigned long addr, unsigned long size);
 138 extern void early_iounmap(void *addr, unsigned long size);
 139
 140 /*
 141  * This one maps high address device memory and turns off caching for that area.
 142  * it's useful if some control registers are in such an area and write combining
 143  * or read caching is not desirable:
 144  */
 145 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
 146 extern void iounmap(volatile void __iomem *addr);
 147
 148 /*
 149  * ISA I/O bus memory addresses are 1:1 with the physical address.
 150  */
 151 #define isa_virt_to_bus virt_to_phys
 152 #define isa_page_to_bus page_to_phys
 153 #define isa_bus_to_virt phys_to_virt
 154
 155 /*
 156  * However PCI ones are not necessarily 1:1 and therefore these interfaces
 157  * are forbidden in portable PCI drivers.
 158  *
 159  * Allow them on x86 for legacy drivers, though.
 160  */
 161 #define virt_to_bus virt_to_phys
 162 #define bus_to_virt phys_to_virt
 163
 164 /*
 165  * readX/writeX() are used to access memory mapped devices. On some
 166  * architectures the memory mapped IO stuff needs to be accessed
 167  * differently. On the x86 architecture, we just read/write the
 168  * memory location directly.
 169  */
 170
 171 static inline __u8 __readb(const volatile void __iomem *addr)
 172 {
 173         return *(__force volatile __u8 *)addr;
 174 }
 175 static inline __u16 __readw(const volatile void __iomem *addr)
 176 {
 177         return *(__force volatile __u16 *)addr;
 178 }
 179 static __always_inline __u32 __readl(const volatile void __iomem *addr)
 180 {
 181         return *(__force volatile __u32 *)addr;
 182 }
 183 static inline __u64 __readq(const volatile void __iomem *addr)
 184 {
 185         return *(__force volatile __u64 *)addr;
 186 }
 187 #define readb(x) __readb(x)
 188 #define readw(x) __readw(x)
 189 #define readl(x) __readl(x)
 190 #define readq(x) __readq(x)
 191 #define readb_relaxed(a) readb(a)
 192 #define readw_relaxed(a) readw(a)
 193 #define readl_relaxed(a) readl(a)
 194 #define readq_relaxed(a) readq(a)
 195 #define __raw_readb readb
 196 #define __raw_readw readw
 197 #define __raw_readl readl
 198 #define __raw_readq readq
 199
 200 #define mmiowb()
 201
 202 static inline void __writel(__u32 b, volatile void __iomem *addr)
 203 {
 204         *(__force volatile __u32 *)addr = b;
 205 }
 206 static inline void __writeq(__u64 b, volatile void __iomem *addr)
 207 {
 208         *(__force volatile __u64 *)addr = b;
 209 }
 210 static inline void __writeb(__u8 b, volatile void __iomem *addr)
 211 {
 212         *(__force volatile __u8 *)addr = b;
 213 }
 214 static inline void __writew(__u16 b, volatile void __iomem *addr)
 215 {
 216         *(__force volatile __u16 *)addr = b;
 217 }
 218 #define writeq(val,addr) __writeq((val),(addr))
 219 #define writel(val,addr) __writel((val),(addr))
 220 #define writew(val,addr) __writew((val),(addr))
 221 #define writeb(val,addr) __writeb((val),(addr))
 222 #define __raw_writeb writeb
 223 #define __raw_writew writew
 224 #define __raw_writel writel
 225 #define __raw_writeq writeq
 226
 227 void __memcpy_fromio(void*,unsigned long,unsigned);
 228 void __memcpy_toio(unsigned long,const void*,unsigned);
 229
 230 static inline void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned len)
 231 {
 232         __memcpy_fromio(to,(unsigned long)from,len);
 233 }
 234 static inline void memcpy_toio(volatile void __iomem *to, const void *from, unsigned len)
 235 {
 236         __memcpy_toio((unsigned long)to,from,len);
 237 }
 238
 239 void memset_io(volatile void __iomem *a, int b, size_t c);
 240
 241 /*
 242  * ISA space is 'always mapped' on a typical x86 system, no need to
 243  * explicitly ioremap() it. The fact that the ISA IO space is mapped
 244  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
 245  * are physical addresses. The following constant pointer can be
 246  * used as the IO-area pointer (it can be iounmapped as well, so the
 247  * analogy with PCI is quite large):
 248  */
 249 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
 250
 251 /* Nothing to do */
 252
 253 #define dma_cache_inv(_start,_size)             do { } while (0)
 254 #define dma_cache_wback(_start,_size)           do { } while (0)
 255 #define dma_cache_wback_inv(_start,_size)       do { } while (0)
 256
 257 #define flush_write_buffers()
 258
 259 extern int iommu_bio_merge;
 260 #define BIO_VMERGE_BOUNDARY iommu_bio_merge
 261
 262 /*
 263  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 264  * access
 265  */
 266 #define xlate_dev_mem_ptr(p)    __va(p)
 267
 268 /*
 269  * Convert a virtual cached pointer to an uncached pointer
 270  */
 271 #define xlate_dev_kmem_ptr(p)   p
 272
 273 #endif /* __KERNEL__ */
 274
 275 #endif