usr/src/grub/grub-0.97/netboot/io.h

   1 #include <sys/ccompile.h>
   2
   3 #ifndef IO_H
   4 #define IO_H
   5
   6 /* Amount of relocation etherboot is experiencing */
   7 extern unsigned long virt_offset;
   8
   9 /* Don't require identity mapped physical memory,
  10  * osloader.c is the only valid user at the moment.
  11  */
  12 unsigned long virt_to_phys(volatile const void *virt_addr);
  13 void *phys_to_virt(unsigned long phys_addr);
  14
  15 /* virt_to_bus converts an addresss inside of etherboot [_start, _end]
  16  * into a memory access cards can use.
  17  */
  18 #define virt_to_bus virt_to_phys
  19
  20
  21 /* bus_to_virt reverses virt_to_bus, the address must be output
  22  * from virt_to_bus to be valid.  This function does not work on
  23  * all bus addresses.
  24  */
  25 #define bus_to_virt phys_to_virt
  26
  27 /* ioremap converts a random 32bit bus address into something
  28  * etherboot can access.
  29  */
  30 static inline void *ioremap(unsigned long bus_addr, unsigned long length __unused)
  31 {
  32         return bus_to_virt(bus_addr);
  33 }
  34
  35 /* iounmap cleans up anything ioremap had to setup */
  36 static inline void iounmap(void *virt_addr __unused)
  37 {
  38         return;
  39 }
  40
  41 /*
  42  * This file contains the definitions for the x86 IO instructions
  43  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
  44  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
  45  * versions of the single-IO instructions (inb_p/inw_p/..).
  46  *
  47  * This file is not meant to be obfuscating: it's just complicated
  48  * to (a) handle it all in a way that makes gcc able to optimize it
  49  * as well as possible and (b) trying to avoid writing the same thing
  50  * over and over again with slight variations and possibly making a
  51  * mistake somewhere.
  52  */
  53
  54 /*
  55  * Thanks to James van Artsdalen for a better timing-fix than
  56  * the two short jumps: using outb's to a nonexistent port seems
  57  * to guarantee better timings even on fast machines.
  58  *
  59  * On the other hand, I'd like to be sure of a non-existent port:
  60  * I feel a bit unsafe about using 0x80 (should be safe, though)
  61  *
  62  *              Linus
  63  */
  64
  65 #ifdef  SLOW_IO_BY_JUMPING
  66 #define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
  67 #else
  68 #define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
  69 #endif
  70
  71 #ifdef  REALLY_SLOW_IO
  72 #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
  73 #else
  74 #define SLOW_DOWN_IO __SLOW_DOWN_IO
  75 #endif
  76
  77 /*
  78  * readX/writeX() are used to access memory mapped devices. On some
  79  * architectures the memory mapped IO stuff needs to be accessed
  80  * differently. On the x86 architecture, we just read/write the
  81  * memory location directly.
  82  */
  83 #define readb(addr) (*(volatile unsigned char *) (addr))
  84 #define readw(addr) (*(volatile unsigned short *) (addr))
  85 #define readl(addr) (*(volatile unsigned int *) (addr))
  86
  87 #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
  88 #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
  89 #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
  90
  91 #define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
  92 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
  93
  94 /*
  95  * Force strict CPU ordering.
  96  * And yes, this is required on UP too when we're talking
  97  * to devices.
  98  *
  99  * For now, "wmb()" doesn't actually do anything, as all
 100  * Intel CPU's follow what Intel calls a *Processor Order*,
 101  * in which all writes are seen in the program order even
 102  * outside the CPU.
 103  *
 104  * I expect future Intel CPU's to have a weaker ordering,
 105  * but I'd also expect them to finally get their act together
 106  * and add some real memory barriers if so.
 107  *
 108  * Some non intel clones support out of order store. wmb() ceases to be a
 109  * nop for these.
 110  */
 111
 112 #define mb()    __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory")
 113 #define rmb()   mb()
 114 #define wmb()   mb();
 115
 116
 117 /*
 118  * Talk about misusing macros..
 119  */
 120
 121 #define __OUT1(s,x) \
 122 extern void __out##s(unsigned x value, unsigned short port); \
 123 extern __GNU_INLINE \
 124 void __out##s(unsigned x value, unsigned short port) {
 125
 126 #define __OUT2(s,s1,s2) \
 127 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
 128
 129 #define __OUT(s,s1,x) \
 130 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
 131 __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
 132 __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
 133 __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
 134
 135 #define __IN1(s,x) \
 136 extern unsigned x __in##s(unsigned short port); \
 137 extern __GNU_INLINE \
 138 unsigned x __in##s(unsigned short port) { unsigned x _v;
 139
 140 #define __IN2(s,s1,s2) \
 141 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
 142
 143 #define __IN(s,s1,x,i...) \
 144 __IN1(s,x) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
 145 __IN1(s##c,x) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
 146 __IN1(s##_p,x) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
 147 __IN1(s##c_p,x) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
 148
 149 #define __INS(s) \
 150 extern void ins##s(unsigned short port, void * addr, unsigned long count); \
 151 extern __GNU_INLINE \
 152 void ins##s(unsigned short port, void * addr, unsigned long count)      \
 153 { __asm__ __volatile__ ("cld ; rep ; ins" #s \
 154 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
 155
 156 #define __OUTS(s) \
 157 extern void outs##s(unsigned short port, const void * addr, unsigned long  count); \
 158 extern __GNU_INLINE \
 159 void outs##s(unsigned short port, const void * addr, unsigned long count) \
 160 { __asm__ __volatile__ ("cld ; rep ; outs" #s \
 161 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
 162
 163 __IN(b,"", char)
 164 __IN(w,"",short)
 165 __IN(l,"", long)
 166
 167 __OUT(b,"b",char)
 168 __OUT(w,"w",short)
 169 __OUT(l,,int)
 170
 171 __INS(b)
 172 __INS(w)
 173 __INS(l)
 174
 175 __OUTS(b)
 176 __OUTS(w)
 177 __OUTS(l)
 178
 179 /*
 180  * Note that due to the way __builtin_constant_p() works, you
 181  *  - can't use it inside a inline function (it will never be true)
 182  *  - you don't have to worry about side effects within the __builtin..
 183  */
 184 #define outb(val,port) \
 185 ((__builtin_constant_p((port)) && (port) < 256) ? \
 186         __outbc((val),(port)) : \
 187         __outb((val),(port)))
 188
 189 #define inb(port) \
 190 ((__builtin_constant_p((port)) && (port) < 256) ? \
 191         __inbc(port) : \
 192         __inb(port))
 193
 194 #define outb_p(val,port) \
 195 ((__builtin_constant_p((port)) && (port) < 256) ? \
 196         __outbc_p((val),(port)) : \
 197         __outb_p((val),(port)))
 198
 199 #define inb_p(port) \
 200 ((__builtin_constant_p((port)) && (port) < 256) ? \
 201         __inbc_p(port) : \
 202         __inb_p(port))
 203
 204 #define outw(val,port) \
 205 ((__builtin_constant_p((port)) && (port) < 256) ? \
 206         __outwc((val),(port)) : \
 207         __outw((val),(port)))
 208
 209 #define inw(port) \
 210 ((__builtin_constant_p((port)) && (port) < 256) ? \
 211         __inwc(port) : \
 212         __inw(port))
 213
 214 #define outw_p(val,port) \
 215 ((__builtin_constant_p((port)) && (port) < 256) ? \
 216         __outwc_p((val),(port)) : \
 217         __outw_p((val),(port)))
 218
 219 #define inw_p(port) \
 220 ((__builtin_constant_p((port)) && (port) < 256) ? \
 221         __inwc_p(port) : \
 222         __inw_p(port))
 223
 224 #define outl(val,port) \
 225 ((__builtin_constant_p((port)) && (port) < 256) ? \
 226         __outlc((val),(port)) : \
 227         __outl((val),(port)))
 228
 229 #define inl(port) \
 230 ((__builtin_constant_p((port)) && (port) < 256) ? \
 231         __inlc(port) : \
 232         __inl(port))
 233
 234 #define outl_p(val,port) \
 235 ((__builtin_constant_p((port)) && (port) < 256) ? \
 236         __outlc_p((val),(port)) : \
 237         __outl_p((val),(port)))
 238
 239 #define inl_p(port) \
 240 ((__builtin_constant_p((port)) && (port) < 256) ? \
 241         __inlc_p(port) : \
 242         __inl_p(port))
 243
 244 #endif /* ETHERBOOT_IO_H */