| [354] | 1 | /* $Id: io.h,v 1.1 2000/04/23 14:55:28 ktk Exp $ */
|
|---|
| 2 |
|
|---|
| 3 | #ifndef _ASM_IO_H
|
|---|
| 4 | #define _ASM_IO_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 | #ifdef SLOW_IO_BY_JUMPING
|
|---|
| 40 | #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
|
|---|
| 41 | #else
|
|---|
| 42 | #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
|
|---|
| 43 | #endif
|
|---|
| 44 |
|
|---|
| 45 | #ifdef REALLY_SLOW_IO
|
|---|
| 46 | #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
|
|---|
| 47 | #else
|
|---|
| 48 | #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
|
|---|
| 49 | #endif
|
|---|
| 50 |
|
|---|
| 51 | /*
|
|---|
| 52 | * Talk about misusing macros..
|
|---|
| 53 | */
|
|---|
| 54 | #define __OUT1(s,x) \
|
|---|
| 55 | extern inline void out##s(unsigned x value, unsigned short port) {
|
|---|
| 56 |
|
|---|
| 57 |
|
|---|
| 58 | #define __IN1(s) \
|
|---|
| 59 | extern inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
|
|---|
| 60 |
|
|---|
| 61 |
|
|---|
| 62 | void outb(unsigned char data, int port);
|
|---|
| 63 | #pragma aux outb = \
|
|---|
| 64 | "out dx, al" \
|
|---|
| 65 | parm [al] [dx];
|
|---|
| 66 |
|
|---|
| 67 | unsigned char inb(int port);
|
|---|
| 68 | #pragma aux inb = \
|
|---|
| 69 | "in al,dx" \
|
|---|
| 70 | parm [dx] \
|
|---|
| 71 | value [al];
|
|---|
| 72 |
|
|---|
| 73 | void outw(unsigned short data, int port);
|
|---|
| 74 | #pragma aux outw = \
|
|---|
| 75 | "out dx, ax" \
|
|---|
| 76 | parm [ax] [dx];
|
|---|
| 77 |
|
|---|
| 78 | unsigned short inw(int port);
|
|---|
| 79 | #pragma aux inw = \
|
|---|
| 80 | "in ax,dx" \
|
|---|
| 81 | parm [dx] \
|
|---|
| 82 | value [ax];
|
|---|
| 83 |
|
|---|
| 84 | void outl(unsigned long data, int port);
|
|---|
| 85 | #pragma aux outl = \
|
|---|
| 86 | "out dx, eax" \
|
|---|
| 87 | parm [eax] [dx];
|
|---|
| 88 |
|
|---|
| 89 | unsigned long inl(int port);
|
|---|
| 90 | #pragma aux inl = \
|
|---|
| 91 | "in eax,dx" \
|
|---|
| 92 | parm [dx] \
|
|---|
| 93 | value [eax];
|
|---|
| 94 |
|
|---|
| 95 | #endif
|
|---|
