include/asm-x86/io_64.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 extern void native_io_delay(void);
  39
  40 extern int io_delay_type;
  41 extern void io_delay_init(void);
  42
  43 #if defined(CONFIG_PARAVIRT)
  44 #include <asm/paravirt.h>
  45 #else
  46
  47 static inline void slow_down_io(void)
  48 {
  49         native_io_delay();
  50 #ifdef REALLY_SLOW_IO
  51         native_io_delay();
  52         native_io_delay();
  53         native_io_delay();
  54 #endif
  55 }
  56 #endif
  57
  58 /*
  59  * Talk about misusing macros..
  60  */
  61 #define __OUT1(s,x) \
  62 static inline void out##s(unsigned x value, unsigned short port) {
  63
  64 #define __OUT2(s,s1,s2) \
  65 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
  66
  67 #ifndef REALLY_SLOW_IO
  68 #define REALLY_SLOW_IO
  69 #define UNSET_REALLY_SLOW_IO
  70 #endif
  71
  72 #define __OUT(s,s1,x) \
  73 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
  74 __OUT1(s##_p, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port)); \
  75                 slow_down_io(); }
  76
  77 #define __IN1(s) \
  78 static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
  79
  80 #define __IN2(s,s1,s2) \
  81 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
  82
  83 #define __IN(s,s1,i...) \
  84 __IN1(s) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i); return _v; } \
  85 __IN1(s##_p) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i);   \
  86                                 slow_down_io(); return _v; }
  87
  88 #ifdef UNSET_REALLY_SLOW_IO
  89 #undef REALLY_SLOW_IO
  90 #endif
  91
  92 #define __INS(s) \
  93 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
  94 { __asm__ __volatile__ ("rep ; ins" #s \
  95 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
  96
  97 #define __OUTS(s) \
  98 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
  99 { __asm__ __volatile__ ("rep ; outs" #s \
 100 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
 101
 102 #define RETURN_TYPE unsigned char
 103 __IN(b,"")
 104 #undef RETURN_TYPE
 105 #define RETURN_TYPE unsigned short
 106 __IN(w,"")
 107 #undef RETURN_TYPE
 108 #define RETURN_TYPE unsigned int
 109 __IN(l,"")
 110 #undef RETURN_TYPE
 111
 112 __OUT(b,"b",char)
 113 __OUT(w,"w",short)
 114 __OUT(l,,int)
 115
 116 __INS(b)
 117 __INS(w)
 118 __INS(l)
 119
 120 __OUTS(b)
 121 __OUTS(w)
 122 __OUTS(l)
 123
 124 #define IO_SPACE_LIMIT 0xffff
 125
 126 #if defined(__KERNEL__) && defined(__x86_64__)
 127
 128 #include <linux/vmalloc.h>
 129
 130 #ifndef __i386__
 131 /*
 132  * Change virtual addresses to physical addresses and vv.
 133  * These are pretty trivial
 134  */
 135 static inline unsigned long virt_to_phys(volatile void * address)
 136 {
 137         return __pa(address);
 138 }
 139
 140 static inline void * phys_to_virt(unsigned long address)
 141 {
 142         return __va(address);
 143 }
 144 #endif
 145
 146 /*
 147  * Change "struct page" to physical address.
 148  */
 149 #define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
 150
 151 #include <asm-generic/iomap.h>
 152
 153 extern void *early_ioremap(unsigned long addr, unsigned long size);
 154 extern void early_iounmap(void *addr, unsigned long size);
 155
 156 /*
 157  * This one maps high address device memory and turns off caching for that area.
 158  * it's useful if some control registers are in such an area and write combining
 159  * or read caching is not desirable:
 160  */
 161 extern void __iomem *ioremap_nocache(unsigned long offset, unsigned long size);
 162 extern void __iomem *ioremap_cache(unsigned long offset, unsigned long size);
 163
 164 /*
 165  * The default ioremap() behavior is non-cached:
 166  */
 167 static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
 168 {
 169         return ioremap_nocache(offset, size);
 170 }
 171
 172 extern void iounmap(volatile void __iomem *addr);
 173
 174 extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
 175
 176 /*
 177  * ISA I/O bus memory addresses are 1:1 with the physical address.
 178  */
 179 #define isa_virt_to_bus virt_to_phys
 180 #define isa_page_to_bus page_to_phys
 181 #define isa_bus_to_virt phys_to_virt
 182
 183 /*
 184  * However PCI ones are not necessarily 1:1 and therefore these interfaces
 185  * are forbidden in portable PCI drivers.
 186  *
 187  * Allow them on x86 for legacy drivers, though.
 188  */
 189 #define virt_to_bus virt_to_phys
 190 #define bus_to_virt phys_to_virt
 191
 192 /*
 193  * readX/writeX() are used to access memory mapped devices. On some
 194  * architectures the memory mapped IO stuff needs to be accessed
 195  * differently. On the x86 architecture, we just read/write the
 196  * memory location directly.
 197  */
 198
 199 static inline __u8 __readb(const volatile void __iomem *addr)
 200 {
 201         return *(__force volatile __u8 *)addr;
 202 }
 203 static inline __u16 __readw(const volatile void __iomem *addr)
 204 {
 205         return *(__force volatile __u16 *)addr;
 206 }
 207 static __always_inline __u32 __readl(const volatile void __iomem *addr)
 208 {
 209         return *(__force volatile __u32 *)addr;
 210 }
 211 static inline __u64 __readq(const volatile void __iomem *addr)
 212 {
 213         return *(__force volatile __u64 *)addr;
 214 }
 215 #define readb(x) __readb(x)
 216 #define readw(x) __readw(x)
 217 #define readl(x) __readl(x)
 218 #define readq(x) __readq(x)
 219 #define readb_relaxed(a) readb(a)
 220 #define readw_relaxed(a) readw(a)
 221 #define readl_relaxed(a) readl(a)
 222 #define readq_relaxed(a) readq(a)
 223 #define __raw_readb readb
 224 #define __raw_readw readw
 225 #define __raw_readl readl
 226 #define __raw_readq readq
 227
 228 #define mmiowb()
 229
 230 static inline void __writel(__u32 b, volatile void __iomem *addr)
 231 {
 232         *(__force volatile __u32 *)addr = b;
 233 }
 234 static inline void __writeq(__u64 b, volatile void __iomem *addr)
 235 {
 236         *(__force volatile __u64 *)addr = b;
 237 }
 238 static inline void __writeb(__u8 b, volatile void __iomem *addr)
 239 {
 240         *(__force volatile __u8 *)addr = b;
 241 }
 242 static inline void __writew(__u16 b, volatile void __iomem *addr)
 243 {
 244         *(__force volatile __u16 *)addr = b;
 245 }
 246 #define writeq(val,addr) __writeq((val),(addr))
 247 #define writel(val,addr) __writel((val),(addr))
 248 #define writew(val,addr) __writew((val),(addr))
 249 #define writeb(val,addr) __writeb((val),(addr))
 250 #define __raw_writeb writeb
 251 #define __raw_writew writew
 252 #define __raw_writel writel
 253 #define __raw_writeq writeq
 254
 255 void __memcpy_fromio(void*,unsigned long,unsigned);
 256 void __memcpy_toio(unsigned long,const void*,unsigned);
 257
 258 static inline void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned len)
 259 {
 260         __memcpy_fromio(to,(unsigned long)from,len);
 261 }
 262 static inline void memcpy_toio(volatile void __iomem *to, const void *from, unsigned len)
 263 {
 264         __memcpy_toio((unsigned long)to,from,len);
 265 }
 266
 267 void memset_io(volatile void __iomem *a, int b, size_t c);
 268
 269 /*
 270  * ISA space is 'always mapped' on a typical x86 system, no need to
 271  * explicitly ioremap() it. The fact that the ISA IO space is mapped
 272  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
 273  * are physical addresses. The following constant pointer can be
 274  * used as the IO-area pointer (it can be iounmapped as well, so the
 275  * analogy with PCI is quite large):
 276  */
 277 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
 278
 279 #define flush_write_buffers()
 280
 281 extern int iommu_bio_merge;
 282 #define BIO_VMERGE_BOUNDARY iommu_bio_merge
 283
 284 /*
 285  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 286  * access
 287  */
 288 #define xlate_dev_mem_ptr(p)    __va(p)
 289
 290 /*
 291  * Convert a virtual cached pointer to an uncached pointer
 292  */
 293 #define xlate_dev_kmem_ptr(p)   p
 294
 295 #endif /* __KERNEL__ */
 296
 297 #endif