627249c7b1
for our use. Use the same search order for BIOS memory size functions as the kernel will later use. Allow the loader to use all of the detected physical memory (this will greatly help people trying to load enormous memory disk images). More correctly handle running out of memory when loading an object. Use the end of base memory for the top of the heap, rather than blindly hoping that there is 384k left. Add copyrights to a couple of files I forgot.
234 lines
6.8 KiB
C
234 lines
6.8 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* MD bootstrap main() and assorted miscellaneous
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* commands.
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*/
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#include <stand.h>
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#include <string.h>
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#include <machine/bootinfo.h>
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#include <sys/reboot.h>
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#include "bootstrap.h"
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#include "libi386/libi386.h"
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#include "btxv86.h"
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/* Arguments passed in from the boot1/boot2 loader */
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static struct
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{
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u_int32_t howto;
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u_int32_t bootdev;
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u_int32_t res0;
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u_int32_t res1;
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u_int32_t res2;
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u_int32_t bootinfo;
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} *kargs;
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static u_int32_t initial_howto;
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static u_int32_t initial_bootdev;
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static struct bootinfo *initial_bootinfo;
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struct arch_switch archsw; /* MI/MD interface boundary */
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static void extract_currdev(void);
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static int isa_inb(int port);
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static void isa_outb(int port, int value);
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/* from vers.c */
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extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
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/* XXX debugging */
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extern char end[];
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void
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main(void)
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{
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int i;
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/* Pick up arguments */
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kargs = (void *)__args;
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initial_howto = kargs->howto;
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initial_bootdev = kargs->bootdev;
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initial_bootinfo = (struct bootinfo *)PTOV(kargs->bootinfo);
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/*
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* Initialise the heap as early as possible. Once this is done, malloc() is usable.
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*/
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bios_getmem();
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setheap((void *)end, (void *)bios_basemem);
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/*
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* XXX Chicken-and-egg problem; we want to have console output early, but some
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* console attributes may depend on reading from eg. the boot device, which we
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* can't do yet.
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*
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* We can use printf() etc. once this is done.
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* If the previous boot stage has requested a serial console, prefer that.
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*/
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if (initial_howto & RB_SERIAL)
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setenv("console", "comconsole", 1);
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cons_probe();
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/*
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* Initialise the block cache
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*/
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bcache_init(32, 512); /* 16k cache XXX tune this */
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/*
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* March through the device switch probing for things.
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*/
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for (i = 0; devsw[i] != NULL; i++)
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if (devsw[i]->dv_init != NULL)
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(devsw[i]->dv_init)();
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printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
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printf("\n");
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printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
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printf("(%s, %s)\n", bootprog_maker, bootprog_date);
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extract_currdev(); /* set $currdev and $loaddev */
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setenv("LINES", "24", 1); /* optional */
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archsw.arch_autoload = i386_autoload;
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archsw.arch_getdev = i386_getdev;
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archsw.arch_copyin = i386_copyin;
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archsw.arch_copyout = i386_copyout;
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archsw.arch_readin = i386_readin;
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archsw.arch_isainb = isa_inb;
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archsw.arch_isaoutb = isa_outb;
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interact(); /* doesn't return */
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}
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/*
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* Set the 'current device' by (if possible) recovering the boot device as
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* supplied by the initial bootstrap.
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*
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* XXX should be extended for netbooting.
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*/
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static void
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extract_currdev(void)
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{
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struct i386_devdesc currdev;
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int major, biosdev;
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/* We're booting from a BIOS disk, try to spiff this */
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currdev.d_dev = devsw[0]; /* XXX presumes that biosdisk is first in devsw */
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currdev.d_type = currdev.d_dev->dv_type;
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if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
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/* The passed-in boot device is bad */
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currdev.d_kind.biosdisk.slice = -1;
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currdev.d_kind.biosdisk.partition = 0;
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biosdev = -1;
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} else {
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currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + B_CONTROLLER(initial_bootdev) - 1;
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currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
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biosdev = initial_bootinfo->bi_bios_dev;
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major = B_TYPE(initial_bootdev);
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/*
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* If we are booted by an old bootstrap, we have to guess at the BIOS
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* unit number. We will loose if there is more than one disk type
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* and we are not booting from the lowest-numbered disk type
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* (ie. SCSI when IDE also exists).
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*/
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if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
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biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
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}
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if ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1) {
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printf("Can't work out which disk we are booting from.\n"
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"Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
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currdev.d_kind.biosdisk.unit = 0;
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}
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env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset);
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env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset);
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}
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COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
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static int
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command_reboot(int argc, char *argv[])
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{
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printf("Rebooting...\n");
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delay(1000000);
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__exit(0);
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}
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/* provide this for panic, as it's not in the startup code */
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void
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exit(int code)
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{
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__exit(code);
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}
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COMMAND_SET(heap, "heap", "show heap usage", command_heap);
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static int
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command_heap(int argc, char *argv[])
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{
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mallocstats();
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printf("heap base at %p, top at %p\n", end, sbrk(0));
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return(CMD_OK);
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}
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/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
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static int
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isa_inb(int port)
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{
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u_char data;
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if (__builtin_constant_p(port) &&
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(((port) & 0xffff) < 0x100) &&
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((port) < 0x10000)) {
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__asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
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} else {
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__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
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}
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return(data);
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}
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static void
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isa_outb(int port, int value)
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{
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u_char al = value;
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if (__builtin_constant_p(port) &&
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(((port) & 0xffff) < 0x100) &&
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((port) < 0x10000)) {
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__asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
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} else {
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__asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
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}
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}
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