| 1 | /* $Id: io.h 142 2000-04-23 14:55:46Z ktk $ */
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| 2 |
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| 3 | #ifndef _ASM_IO_H
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| 4 | #define _ASM_IO_H
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| 5 |
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| 6 | /*
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| 7 | * This file contains the definitions for the x86 IO instructions
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| 8 | * inb/inw/inl/outb/outw/outl and the "string versions" of the same
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| 9 | * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
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| 10 | * versions of the single-IO instructions (inb_p/inw_p/..).
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| 11 | *
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| 12 | * This file is not meant to be obfuscating: it's just complicated
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| 13 | * to (a) handle it all in a way that makes gcc able to optimize it
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| 14 | * as well as possible and (b) trying to avoid writing the same thing
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| 15 | * over and over again with slight variations and possibly making a
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| 16 | * mistake somewhere.
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| 17 | */
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| 18 |
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| 19 | /*
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| 20 | * Thanks to James van Artsdalen for a better timing-fix than
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| 21 | * the two short jumps: using outb's to a nonexistent port seems
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| 22 | * to guarantee better timings even on fast machines.
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| 23 | *
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| 24 | * On the other hand, I'd like to be sure of a non-existent port:
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| 25 | * I feel a bit unsafe about using 0x80 (should be safe, though)
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| 26 | *
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| 27 | * Linus
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| 28 | */
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| 29 |
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| 30 | /*
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| 31 | * Bit simplified and optimized by Jan Hubicka
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| 32 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
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| 33 | *
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| 34 | * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
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| 35 | * isa_read[wl] and isa_write[wl] fixed
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| 36 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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| 37 | */
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| 38 |
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| 39 | #ifdef SLOW_IO_BY_JUMPING
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| 40 | #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
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| 41 | #else
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| 42 | #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
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| 43 | #endif
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| 44 |
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| 45 | #ifdef REALLY_SLOW_IO
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| 46 | #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
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| 47 | #else
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| 48 | #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
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| 49 | #endif
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| 50 |
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| 51 | /*
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| 52 | * Talk about misusing macros..
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| 53 | */
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| 54 | #define __OUT1(s,x) \
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| 55 | extern inline void out##s(unsigned x value, unsigned short port) {
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| 56 |
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| 57 |
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| 58 | #define __IN1(s) \
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| 59 | extern inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
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| 60 |
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| 61 |
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| 62 | void outb(unsigned char data, int port);
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| 63 | #pragma aux outb = \
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| 64 | "out dx, al" \
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| 65 | parm [al] [dx];
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| 66 |
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| 67 | unsigned char inb(int port);
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| 68 | #pragma aux inb = \
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| 69 | "in al,dx" \
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| 70 | parm [dx] \
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| 71 | value [al];
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| 72 |
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| 73 | void outw(unsigned short data, int port);
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| 74 | #pragma aux outw = \
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| 75 | "out dx, ax" \
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| 76 | parm [ax] [dx];
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| 77 |
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| 78 | unsigned short inw(int port);
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| 79 | #pragma aux inw = \
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| 80 | "in ax,dx" \
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| 81 | parm [dx] \
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| 82 | value [ax];
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| 83 |
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| 84 | void outl(unsigned long data, int port);
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| 85 | #pragma aux outl = \
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| 86 | "out dx, eax" \
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| 87 | parm [eax] [dx];
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| 88 |
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| 89 | unsigned long inl(int port);
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| 90 | #pragma aux inl = \
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| 91 | "in eax,dx" \
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| 92 | parm [dx] \
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| 93 | value [eax];
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| 94 |
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| 95 | #endif
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