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Annotation of Gnu-Mach/linux/src/include/asm-i386/io.h, revision 1.1

1.1     ! root        1: #ifndef _ASM_IO_H
        !             2: #define _ASM_IO_H
        !             3: 
        !             4: /*
        !             5:  * This file contains the definitions for the x86 IO instructions
        !             6:  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
        !             7:  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
        !             8:  * versions of the single-IO instructions (inb_p/inw_p/..).
        !             9:  *
        !            10:  * This file is not meant to be obfuscating: it's just complicated
        !            11:  * to (a) handle it all in a way that makes gcc able to optimize it
        !            12:  * as well as possible and (b) trying to avoid writing the same thing
        !            13:  * over and over again with slight variations and possibly making a
        !            14:  * mistake somewhere.
        !            15:  */
        !            16: 
        !            17: /*
        !            18:  * Thanks to James van Artsdalen for a better timing-fix than
        !            19:  * the two short jumps: using outb's to a nonexistent port seems
        !            20:  * to guarantee better timings even on fast machines.
        !            21:  *
        !            22:  * On the other hand, I'd like to be sure of a non-existent port:
        !            23:  * I feel a bit unsafe about using 0x80 (should be safe, though)
        !            24:  *
        !            25:  *             Linus
        !            26:  */
        !            27: 
        !            28: #ifdef SLOW_IO_BY_JUMPING
        !            29: #define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
        !            30: #else
        !            31: #define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
        !            32: #endif
        !            33: 
        !            34: #ifdef REALLY_SLOW_IO
        !            35: #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
        !            36: #else
        !            37: #define SLOW_DOWN_IO __SLOW_DOWN_IO
        !            38: #endif
        !            39: 
        !            40: /*
        !            41:  * Change virtual addresses to physical addresses and vv.
        !            42:  * These are trivial on the 1:1 Linux/i386 mapping (but if we ever
        !            43:  * make the kernel segment mapped at 0, we need to do translation
        !            44:  * on the i386 as well)
        !            45:  */
        !            46: extern inline unsigned long virt_to_phys(volatile void * address)
        !            47: {
        !            48:        return (unsigned long) address;
        !            49: }
        !            50: 
        !            51: extern inline void * phys_to_virt(unsigned long address)
        !            52: {
        !            53:        return (void *) address;
        !            54: }
        !            55: 
        !            56: /*
        !            57:  * IO bus memory addresses are also 1:1 with the physical address
        !            58:  */
        !            59: #define virt_to_bus virt_to_phys
        !            60: #define bus_to_virt phys_to_virt
        !            61: 
        !            62: /*
        !            63:  * readX/writeX() are used to access memory mapped devices. On some
        !            64:  * architectures the memory mapped IO stuff needs to be accessed
        !            65:  * differently. On the x86 architecture, we just read/write the
        !            66:  * memory location directly.
        !            67:  */
        !            68: #define readb(addr) (*(volatile unsigned char *) (addr))
        !            69: #define readw(addr) (*(volatile unsigned short *) (addr))
        !            70: #define readl(addr) (*(volatile unsigned int *) (addr))
        !            71: 
        !            72: #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
        !            73: #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
        !            74: #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
        !            75: 
        !            76: #define memset_io(a,b,c)       memset((void *)(a),(b),(c))
        !            77: #define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
        !            78: #define memcpy_toio(a,b,c)     memcpy((void *)(a),(b),(c))
        !            79: 
        !            80: /*
        !            81:  * Again, i386 does not require mem IO specific function.
        !            82:  */
        !            83: 
        !            84: #define eth_io_copy_and_sum(a,b,c,d)   eth_copy_and_sum((a),(void *)(b),(c),(d))
        !            85: 
        !            86: /*
        !            87:  * Talk about misusing macros..
        !            88:  */
        !            89: 
        !            90: #define __OUT1(s,x) \
        !            91: extern inline void __out##s(unsigned x value, unsigned short port) {
        !            92: 
        !            93: #define __OUT2(s,s1,s2) \
        !            94: __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
        !            95: 
        !            96: #define __OUT(s,s1,x) \
        !            97: __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
        !            98: __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
        !            99: __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
        !           100: __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
        !           101: 
        !           102: #define __IN1(s) \
        !           103: extern inline RETURN_TYPE __in##s(unsigned short port) { RETURN_TYPE _v;
        !           104: 
        !           105: #define __IN2(s,s1,s2) \
        !           106: __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
        !           107: 
        !           108: #define __IN(s,s1,i...) \
        !           109: __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
        !           110: __IN1(s##c) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
        !           111: __IN1(s##_p) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
        !           112: __IN1(s##c_p) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
        !           113: 
        !           114: #define __INS(s) \
        !           115: extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
        !           116: { __asm__ __volatile__ ("cld ; rep ; ins" #s \
        !           117: : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
        !           118: 
        !           119: #define __OUTS(s) \
        !           120: extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
        !           121: { __asm__ __volatile__ ("cld ; rep ; outs" #s \
        !           122: : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
        !           123: 
        !           124: #define RETURN_TYPE unsigned char
        !           125: /* __IN(b,"b","0" (0)) */
        !           126: __IN(b,"")
        !           127: #undef RETURN_TYPE
        !           128: #define RETURN_TYPE unsigned short
        !           129: /* __IN(w,"w","0" (0)) */
        !           130: __IN(w,"")
        !           131: #undef RETURN_TYPE
        !           132: #define RETURN_TYPE unsigned int
        !           133: __IN(l,"")
        !           134: #undef RETURN_TYPE
        !           135: 
        !           136: __OUT(b,"b",char)
        !           137: __OUT(w,"w",short)
        !           138: __OUT(l,,int)
        !           139: 
        !           140: __INS(b)
        !           141: __INS(w)
        !           142: __INS(l)
        !           143: 
        !           144: __OUTS(b)
        !           145: __OUTS(w)
        !           146: __OUTS(l)
        !           147: 
        !           148: /*
        !           149:  * Note that due to the way __builtin_constant_p() works, you
        !           150:  *  - can't use it inside a inline function (it will never be true)
        !           151:  *  - you don't have to worry about side effects within the __builtin..
        !           152:  */
        !           153: #define outb(val,port) \
        !           154: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           155:        __outbc((val),(port)) : \
        !           156:        __outb((val),(port)))
        !           157: 
        !           158: #define inb(port) \
        !           159: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           160:        __inbc(port) : \
        !           161:        __inb(port))
        !           162: 
        !           163: #define outb_p(val,port) \
        !           164: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           165:        __outbc_p((val),(port)) : \
        !           166:        __outb_p((val),(port)))
        !           167: 
        !           168: #define inb_p(port) \
        !           169: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           170:        __inbc_p(port) : \
        !           171:        __inb_p(port))
        !           172: 
        !           173: #define outw(val,port) \
        !           174: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           175:        __outwc((val),(port)) : \
        !           176:        __outw((val),(port)))
        !           177: 
        !           178: #define inw(port) \
        !           179: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           180:        __inwc(port) : \
        !           181:        __inw(port))
        !           182: 
        !           183: #define outw_p(val,port) \
        !           184: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           185:        __outwc_p((val),(port)) : \
        !           186:        __outw_p((val),(port)))
        !           187: 
        !           188: #define inw_p(port) \
        !           189: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           190:        __inwc_p(port) : \
        !           191:        __inw_p(port))
        !           192: 
        !           193: #define outl(val,port) \
        !           194: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           195:        __outlc((val),(port)) : \
        !           196:        __outl((val),(port)))
        !           197: 
        !           198: #define inl(port) \
        !           199: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           200:        __inlc(port) : \
        !           201:        __inl(port))
        !           202: 
        !           203: #define outl_p(val,port) \
        !           204: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           205:        __outlc_p((val),(port)) : \
        !           206:        __outl_p((val),(port)))
        !           207: 
        !           208: #define inl_p(port) \
        !           209: ((__builtin_constant_p((port)) && (port) < 256) ? \
        !           210:        __inlc_p(port) : \
        !           211:        __inl_p(port))
        !           212: 
        !           213: #endif

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