include/asm-x86_64/io.h

   1 #ifndef _ASM_IO_H
   2 #define _ASM_IO_H
   3
   4 #include <linux/config.h>
   5
   6 /*
   7  * This file contains the definitions for the x86 IO instructions
   8  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
   9  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
  10  * versions of the single-IO instructions (inb_p/inw_p/..).
  11  *
  12  * This file is not meant to be obfuscating: it's just complicated
  13  * to (a) handle it all in a way that makes gcc able to optimize it
  14  * as well as possible and (b) trying to avoid writing the same thing
  15  * over and over again with slight variations and possibly making a
  16  * mistake somewhere.
  17  */
  18
  19 /*
  20  * Thanks to James van Artsdalen for a better timing-fix than
  21  * the two short jumps: using outb's to a nonexistent port seems
  22  * to guarantee better timings even on fast machines.
  23  *
  24  * On the other hand, I'd like to be sure of a non-existent port:
  25  * I feel a bit unsafe about using 0x80 (should be safe, though)
  26  *
  27  *              Linus
  28  */
  29
  30  /*
  31   *  Bit simplified and optimized by Jan Hubicka
  32   *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
  33   *
  34   *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
  35   *  isa_read[wl] and isa_write[wl] fixed
  36   *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  37   */
  38
  39 #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
  40
  41 #ifdef REALLY_SLOW_IO
  42 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
  43 #else
  44 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
  45 #endif
  46
  47 /*
  48  * Talk about misusing macros..
  49  */
  50 #define __OUT1(s,x) \
  51 static inline void out##s(unsigned x value, unsigned short port) {
  52
  53 #define __OUT2(s,s1,s2) \
  54 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
  55
  56 #define __OUT(s,s1,x) \
  57 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
  58 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \
  59
  60 #define __IN1(s) \
  61 static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
  62
  63 #define __IN2(s,s1,s2) \
  64 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
  65
  66 #define __IN(s,s1,i...) \
  67 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
  68 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
  69
  70 #define __INS(s) \
  71 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
  72 { __asm__ __volatile__ ("rep ; ins" #s \
  73 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
  74
  75 #define __OUTS(s) \
  76 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
  77 { __asm__ __volatile__ ("rep ; outs" #s \
  78 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
  79
  80 #define RETURN_TYPE unsigned char
  81 __IN(b,"")
  82 #undef RETURN_TYPE
  83 #define RETURN_TYPE unsigned short
  84 __IN(w,"")
  85 #undef RETURN_TYPE
  86 #define RETURN_TYPE unsigned int
  87 __IN(l,"")
  88 #undef RETURN_TYPE
  89
  90 __OUT(b,"b",char)
  91 __OUT(w,"w",short)
  92 __OUT(l,,int)
  93
  94 __INS(b)
  95 __INS(w)
  96 __INS(l)
  97
  98 __OUTS(b)
  99 __OUTS(w)
 100 __OUTS(l)
 101
 102 #define IO_SPACE_LIMIT 0xffff
 103
 104 #if defined(__KERNEL__) && __x86_64__
 105
 106 #include <linux/vmalloc.h>
 107
 108 #ifndef __i386__
 109 /*
 110  * Change virtual addresses to physical addresses and vv.
 111  * These are pretty trivial
 112  */
 113 static inline unsigned long virt_to_phys(volatile void * address)
 114 {
 115         return __pa(address);
 116 }
 117
 118 static inline void * phys_to_virt(unsigned long address)
 119 {
 120         return __va(address);
 121 }
 122 #endif
 123
 124 /*
 125  * Change "struct page" to physical address.
 126  */
 127 #define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
 128
 129 #include <asm-generic/iomap.h>
 130
 131 extern void __iomem *__ioremap(unsigned long offset, unsigned long size, unsigned long flags);
 132
 133 static inline void __iomem * ioremap (unsigned long offset, unsigned long size)
 134 {
 135         return __ioremap(offset, size, 0);
 136 }
 137
 138 extern void *early_ioremap(unsigned long addr, unsigned long size);
 139 extern void early_iounmap(void *addr, unsigned long size);
 140
 141 /*
 142  * This one maps high address device memory and turns off caching for that area.
 143  * it's useful if some control registers are in such an area and write combining
 144  * or read caching is not desirable:
 145  */
 146 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
 147 extern void iounmap(volatile void __iomem *addr);
 148
 149 /*
 150  * ISA I/O bus memory addresses are 1:1 with the physical address.
 151  */
 152 #define isa_virt_to_bus virt_to_phys
 153 #define isa_page_to_bus page_to_phys
 154 #define isa_bus_to_virt phys_to_virt
 155
 156 /*
 157  * However PCI ones are not necessarily 1:1 and therefore these interfaces
 158  * are forbidden in portable PCI drivers.
 159  *
 160  * Allow them on x86 for legacy drivers, though.
 161  */
 162 #define virt_to_bus virt_to_phys
 163 #define bus_to_virt phys_to_virt
 164
 165 /*
 166  * readX/writeX() are used to access memory mapped devices. On some
 167  * architectures the memory mapped IO stuff needs to be accessed
 168  * differently. On the x86 architecture, we just read/write the
 169  * memory location directly.
 170  */
 171
 172 static inline __u8 __readb(const volatile void __iomem *addr)
 173 {
 174         return *(__force volatile __u8 *)addr;
 175 }
 176 static inline __u16 __readw(const volatile void __iomem *addr)
 177 {
 178         return *(__force volatile __u16 *)addr;
 179 }
 180 static __always_inline __u32 __readl(const volatile void __iomem *addr)
 181 {
 182         return *(__force volatile __u32 *)addr;
 183 }
 184 static inline __u64 __readq(const volatile void __iomem *addr)
 185 {
 186         return *(__force volatile __u64 *)addr;
 187 }
 188 #define readb(x) __readb(x)
 189 #define readw(x) __readw(x)
 190 #define readl(x) __readl(x)
 191 #define readq(x) __readq(x)
 192 #define readb_relaxed(a) readb(a)
 193 #define readw_relaxed(a) readw(a)
 194 #define readl_relaxed(a) readl(a)
 195 #define readq_relaxed(a) readq(a)
 196 #define __raw_readb readb
 197 #define __raw_readw readw
 198 #define __raw_readl readl
 199 #define __raw_readq readq
 200
 201 #define mmiowb()
 202
 203 static inline void __writel(__u32 b, volatile void __iomem *addr)
 204 {
 205         *(__force volatile __u32 *)addr = b;
 206 }
 207 static inline void __writeq(__u64 b, volatile void __iomem *addr)
 208 {
 209         *(__force volatile __u64 *)addr = b;
 210 }
 211 static inline void __writeb(__u8 b, volatile void __iomem *addr)
 212 {
 213         *(__force volatile __u8 *)addr = b;
 214 }
 215 static inline void __writew(__u16 b, volatile void __iomem *addr)
 216 {
 217         *(__force volatile __u16 *)addr = b;
 218 }
 219 #define writeq(val,addr) __writeq((val),(addr))
 220 #define writel(val,addr) __writel((val),(addr))
 221 #define writew(val,addr) __writew((val),(addr))
 222 #define writeb(val,addr) __writeb((val),(addr))
 223 #define __raw_writeb writeb
 224 #define __raw_writew writew
 225 #define __raw_writel writel
 226 #define __raw_writeq writeq
 227
 228 void __memcpy_fromio(void*,unsigned long,unsigned);
 229 void __memcpy_toio(unsigned long,const void*,unsigned);
 230
 231 static inline void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned len)
 232 {
 233         __memcpy_fromio(to,(unsigned long)from,len);
 234 }
 235 static inline void memcpy_toio(volatile void __iomem *to, const void *from, unsigned len)
 236 {
 237         __memcpy_toio((unsigned long)to,from,len);
 238 }
 239
 240 void memset_io(volatile void __iomem *a, int b, size_t c);
 241
 242 /*
 243  * ISA space is 'always mapped' on a typical x86 system, no need to
 244  * explicitly ioremap() it. The fact that the ISA IO space is mapped
 245  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
 246  * are physical addresses. The following constant pointer can be
 247  * used as the IO-area pointer (it can be iounmapped as well, so the
 248  * analogy with PCI is quite large):
 249  */
 250 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
 251
 252 /*
 253  * Again, x86-64 does not require mem IO specific function.
 254  */
 255
 256 #define eth_io_copy_and_sum(a,b,c,d)            eth_copy_and_sum((a),(void *)(b),(c),(d))
 257
 258 /**
 259  *      check_signature         -       find BIOS signatures
 260  *      @io_addr: mmio address to check
 261  *      @signature:  signature block
 262  *      @length: length of signature
 263  *
 264  *      Perform a signature comparison with the mmio address io_addr. This
 265  *      address should have been obtained by ioremap.
 266  *      Returns 1 on a match.
 267  */
 268
 269 static inline int check_signature(void __iomem *io_addr,
 270         const unsigned char *signature, int length)
 271 {
 272         int retval = 0;
 273         do {
 274                 if (readb(io_addr) != *signature)
 275                         goto out;
 276                 io_addr++;
 277                 signature++;
 278                 length--;
 279         } while (length);
 280         retval = 1;
 281 out:
 282         return retval;
 283 }
 284
 285 /* Nothing to do */
 286
 287 #define dma_cache_inv(_start,_size)             do { } while (0)
 288 #define dma_cache_wback(_start,_size)           do { } while (0)
 289 #define dma_cache_wback_inv(_start,_size)       do { } while (0)
 290
 291 #define flush_write_buffers()
 292
 293 extern int iommu_bio_merge;
 294 #define BIO_VMERGE_BOUNDARY iommu_bio_merge
 295
 296 /*
 297  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 298  * access
 299  */
 300 #define xlate_dev_mem_ptr(p)    __va(p)
 301
 302 /*
 303  * Convert a virtual cached pointer to an uncached pointer
 304  */
 305 #define xlate_dev_kmem_ptr(p)   p
 306
 307 #endif /* __KERNEL__ */
 308
 309 #endif