grub-0.97/grub/asmstub.c

5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* asmstub.c - a version of shared_src/asm.S that works under Unix */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/*
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  GRUB  --  GRand Unified Bootloader
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  Copyright (C) 1999,2000,2001,2002,2004  Free Software Foundation, Inc.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  This program is free software; you can redistribute it and/or modify
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  it under the terms of the GNU General Public License as published by
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  the Free Software Foundation; either version 2 of the License, or
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  (at your option) any later version.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  This program is distributed in the hope that it will be useful,
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  but WITHOUT ANY WARRANTY; without even the implied warranty of
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  GNU General Public License for more details.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  You should have received a copy of the GNU General Public License
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  along with this program; if not, write to the Free Software
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/*
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * Copyright 2016 Nexenta Systems, Inc.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* Try to use glibc's transparant LFS support. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#define _LARGEFILE_SOURCE   1
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* lseek becomes synonymous with lseek64.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#define _FILE_OFFSET_BITS   64
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* Simulator entry point. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonint grub_stage2 (void);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <stdlib.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <string.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <ctype.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <assert.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <stdio.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <sys/types.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <sys/stat.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <fcntl.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <time.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <errno.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <string.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <unistd.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <setjmp.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <sys/time.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <termios.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <signal.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#ifdef __linux__
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon# include <sys/ioctl.h>     /* ioctl */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon# if !defined(__GLIBC__) || \
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    ((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1)))
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* Maybe libc doesn't have large file support.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#  include <linux/unistd.h> /* _llseek */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon# endif /* (GLIBC < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR < 1)) */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon# ifndef BLKFLSBUF
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#  define BLKFLSBUF _IO (0x12,97)   /* flush buffer cache */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon# endif /* ! BLKFLSBUF */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#endif /* __linux__ */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* We want to prevent any circularararity in our stubs, as well as
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon   libc name clashes. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#define WITHOUT_LIBC_STUBS 1
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <shared.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <device.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <serial.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#include <term.h>
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* Simulated memory sizes. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#define EXTENDED_MEMSIZE (64 * 1024 * 1024) /* 64MB */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#define CONVENTIONAL_MEMSIZE (640 * 1024)   /* 640kB */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonunsigned long install_partition = 0x20000;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonunsigned long boot_drive = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonint saved_entryno = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonchar version_string[] = VERSION;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonchar config_file[128] = "/boot/grub/menu.lst"; /* FIXME: arbitrary */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonunsigned long linux_text_len = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonchar *linux_data_tmp_addr = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonchar *linux_data_real_addr = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonunsigned short io_map[IO_MAP_SIZE];
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonstruct apm_info apm_bios_info;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* Emulation requirements. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonchar *grub_scratch_mem = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonstruct geometry *disks = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* The map between BIOS drives and UNIX device file names.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonchar **device_map = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* The jump buffer for exiting correctly.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonstatic jmp_buf env_for_exit;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* The current color for console.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonint console_current_color = A_NORMAL;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* The file descriptor for a serial device.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonstatic int serial_fd = -1;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* The file name of a serial device.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonstatic char *serial_device = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#ifdef SIMULATE_SLOWNESS_OF_SERIAL
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* The speed of a serial device.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonstatic unsigned int serial_speed;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#endif /* SIMULATE_SLOWNESS_OF_SERIAL */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* The main entry point into this mess. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonint
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poongrub_stage2 (void)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon{
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* These need to be static, because they survive our stack transitions. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  static int status = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  static char *realstack;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  char *scratch, *simstack;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  int i;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  auto void doit (void);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* We need a nested function so that we get a clean stack frame,
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon     regardless of how the code is optimized. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  void doit ()
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      /* Make sure our stack lives in the simulated memory area. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      asm volatile ("movl %%esp, %0\n\tmovl %1, %%esp\n"
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon            : "=&r" (realstack) : "r" (simstack));
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      /* Do a setjmp here for the stop command.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      if (! setjmp (env_for_exit))
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      /* Actually enter the generic stage2 code.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      status = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      init_bios_info ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    }
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      else
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      /* If ERRNUM is non-zero, then set STATUS to non-zero.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      if (errnum)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon        status = 1;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    }
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      /* Replace our stack before we use any local variables. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      asm volatile ("movl %0, %%esp\n" : : "r" (realstack));
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    }
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert (grub_scratch_mem == 0);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  scratch = malloc (0x100000 + EXTENDED_MEMSIZE + 15);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert (scratch);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  grub_scratch_mem = (char *) ((((int) scratch) >> 4) << 4);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* FIXME: simulate the memory holes using mprot, if available. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert (disks == 0);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  disks = malloc (NUM_DISKS * sizeof (*disks));
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert (disks);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Initialize DISKS.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  for (i = 0; i < NUM_DISKS; i++)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    disks[i].flags = -1;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (! init_device_map (&device_map, device_map_file, floppy_disks))
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    return 1;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Check some invariants. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert ((SCRATCHSEG << 4) == SCRATCHADDR);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert ((BUFFERSEG << 4) == BUFFERADDR);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert (BUFFERADDR + BUFFERLEN == SCRATCHADDR);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert (FSYS_BUF % 16 == 0);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  assert (FSYS_BUF + FSYS_BUFLEN == BUFFERADDR);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#ifdef HAVE_LIBCURSES
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Get into char-at-a-time mode. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (use_curses)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      initscr ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      cbreak ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      noecho ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      nonl ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      scrollok (stdscr, TRUE);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      keypad (stdscr, TRUE);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      wtimeout (stdscr, 100);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      signal (SIGWINCH, SIG_IGN);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    }
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#endif
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Make sure that actual writing is done.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  sync ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Set our stack, and go for it. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  simstack = (char *) PROTSTACKINIT;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  doit ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* I don't know if this is necessary really.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  sync ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#ifdef HAVE_LIBCURSES
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (use_curses)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    endwin ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#endif
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Close off the file descriptors we used. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  for (i = 0; i < NUM_DISKS; i ++)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    if (disks[i].flags != -1)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#ifdef __linux__
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    /* In Linux, invalidate the buffer cache. In other OSes, reboot
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon       is one of the solutions...  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    ioctl (disks[i].flags, BLKFLSBUF, 0);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#elif defined(__sun)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    /* FIXME */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#else
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon# warning "In your operating system, the buffer cache will not be flushed."
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#endif
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    close (disks[i].flags);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      }
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (serial_fd >= 0)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    close (serial_fd);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Release memory. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  restore_device_map (device_map);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  device_map = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  free (disks);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  disks = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  free (scratch);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  grub_scratch_mem = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (serial_device)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    free (serial_device);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  serial_device = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Ahh... at last we're ready to return to caller. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  return status;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon}
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* Assign DRIVE to a device name DEVICE.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonvoid
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonassign_device_name (int drive, const char *device)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon{
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* If DRIVE is already assigned, free it.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (device_map[drive])
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    free (device_map[drive]);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* If the old one is already opened, close it.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (disks[drive].flags != -1)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      close (disks[drive].flags);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon      disks[drive].flags = -1;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    }
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Assign DRIVE to DEVICE.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (! device)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    device_map[drive] = 0;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  else
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    device_map[drive] = strdup (device);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon}
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonvoid
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonstop (void)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon{
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#ifdef HAVE_LIBCURSES
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  if (use_curses)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon    endwin ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon#endif
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  /* Jump to doit.  */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  longjmp (env_for_exit, 1);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon}
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonvoid
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poongrub_reboot (void)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon{
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon  stop ();
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon}
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonvoid
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poongrub_halt (int no_apm)
{
  stop ();
}

/* calls for direct boot-loader chaining */
void
chain_stage1 (unsigned long segment, unsigned long offset,
          unsigned long part_table_addr)
{
  stop ();
}


void
chain_stage2 (unsigned long segment, unsigned long offset, int second_sector)
{
  stop ();
}


/* do some funky stuff, then boot linux */
void
linux_boot (void)
{
  stop ();
}


/* For bzImage kernels. */
void
big_linux_boot (void)
{
  stop ();
}


/* booting a multiboot executable */
void
multi_boot (int start, int mb_info)
{
  stop ();
}

/* sets it to linear or wired A20 operation */
void
gateA20 (int linear)
{
  /* Nothing to do in the simulator. */
}

/* Set up the int15 handler.  */
void
set_int15_handler (void)
{
  /* Nothing to do in the simulator.  */
}

/* Restore the original int15 handler.  */
void
unset_int15_handler (void)
{
  /* Nothing to do in the simulator.  */
}

/* The key map.  */
unsigned short bios_key_map[KEY_MAP_SIZE + 1];
unsigned short ascii_key_map[KEY_MAP_SIZE + 1];

/* Copy MAP to the drive map and set up the int13 handler.  */
void
set_int13_handler (unsigned short *map)
{
  /* Nothing to do in the simulator.  */
}

int
get_code_end (void)
{
  /* Just return a little area for simulation. */
  return BOOTSEC_LOCATION + (60 * 1024);
}


/* memory probe routines */
int
get_memsize (int type)
{
  if (! type)
    return CONVENTIONAL_MEMSIZE >> 10;
  else
    return EXTENDED_MEMSIZE >> 10;
}


/* get_eisamemsize() :  return packed EISA memory map, lower 16 bits is
 *      memory between 1M and 16M in 1K parts, upper 16 bits is
 *      memory above 16M in 64K parts.  If error, return -1.
 */
int
get_eisamemsize (void)
{
  return (EXTENDED_MEMSIZE >> 10);
}


#define MMAR_DESC_TYPE_AVAILABLE 1 /* available to OS */
#define MMAR_DESC_TYPE_RESERVED 2 /* not available */
#define MMAR_DESC_TYPE_ACPI_RECLAIM 3 /* usable by OS after reading ACPI */
#define MMAR_DESC_TYPE_ACPI_NVS 4 /* required to save between NVS sessions */

#define MMAR_DESC_LENGTH    20

/* Fetch the next entry in the memory map and return the continuation
   value.  DESC is a pointer to the descriptor buffer, and CONT is the
   previous continuation value (0 to get the first entry in the
   map).  */
int
get_mmap_entry (struct mmar_desc *desc, int cont)
{
  /* Record the memory map statically.  */
  static struct mmar_desc desc_table[] =
  {
    /* The conventional memory.  */
    {
      MMAR_DESC_LENGTH,
      0,
      CONVENTIONAL_MEMSIZE,
      MMAR_DESC_TYPE_AVAILABLE
    },
    /* BIOS RAM and ROM (such as video memory).  */
    {
      MMAR_DESC_LENGTH,
      CONVENTIONAL_MEMSIZE,
      0x100000 - CONVENTIONAL_MEMSIZE,
      MMAR_DESC_TYPE_RESERVED
    },
    /* The extended memory.  */
    {
      MMAR_DESC_LENGTH,
      0x100000,
      EXTENDED_MEMSIZE,
      MMAR_DESC_TYPE_AVAILABLE
    }
  };

  int num = sizeof (desc_table) / sizeof (*desc_table);

  if (cont < 0 || cont >= num)
    {
      /* Should not happen.  */
      desc->desc_len = 0;
    }
  else
    {
      /* Copy the entry.  */
      *desc = desc_table[cont++];

      /* If the next entry exists, return the index.  */
      if (cont < num)
    return cont;
    }

  return 0;
}

/* Track the int13 handler.  */
void
track_int13 (int drive)
{
  /* Nothing to do in the simulator.  */
}

/* Get the ROM configuration table.  */
unsigned long
get_rom_config_table (void)
{
  return 0;
}

/* Get APM BIOS information.  */
void
get_apm_info (void)
{
  /* Nothing to do in the simulator.  */
}

/* Get VBE controller information.  */
int
get_vbe_controller_info (struct vbe_controller *controller)
{
  /* Always fails.  */
  return 0;
}

/* Get VBE mode information.  */
int
get_vbe_mode_info (int mode_number, struct vbe_mode *mode)
{
  /* Always fails.  */
  return 0;
}

/* Set VBE mode.  */
int
set_vbe_mode (int mode_number)
{
  /* Always fails.  */
  return 0;
}

/* low-level timing info */
int
getrtsecs (void)
{
  /* FIXME: exact value is not important, so just return time_t for now. */
  return time (0);
}

int
currticks (void)
{
  struct timeval tv;
  long csecs;
  int ticks_per_csec, ticks_per_usec;

  /* Note: 18.2 ticks/sec.  */

  /* Get current time.  */
  gettimeofday (&tv, 0);

  /* Compute centiseconds.  */
  csecs = tv.tv_sec / 10;

  /* Ticks per centisecond.  */
  ticks_per_csec = csecs * 182;

  /* Ticks per microsecond.  */
  ticks_per_usec = (((tv.tv_sec - csecs * 10) * 1000000 + tv.tv_usec)
            * 182 / 10000000);

  /* Sum them.  */
  return ticks_per_csec + ticks_per_usec;
}

/* displays an ASCII character.  IBM displays will translate some
   characters to special graphical ones */
void
console_putchar (int c)
{
  /* Curses doesn't have VGA fonts.  */
  switch (c)
    {
    case DISP_UL:
      c = ACS_ULCORNER;
      break;
    case DISP_UR:
      c = ACS_URCORNER;
      break;
    case DISP_LL:
      c = ACS_LLCORNER;
      break;
    case DISP_LR:
      c = ACS_LRCORNER;
      break;
    case DISP_HORIZ:
      c = ACS_HLINE;
      break;
    case DISP_VERT:
      c = ACS_VLINE;
      break;
    case DISP_LEFT:
      c = ACS_LARROW;
      break;
    case DISP_RIGHT:
      c = ACS_RARROW;
      break;
    case DISP_UP:
      c = ACS_UARROW;
      break;
    case DISP_DOWN:
      c = ACS_DARROW;
      break;
    default:
      break;
    }

#ifdef HAVE_LIBCURSES
  if (use_curses)
    {
      /* In ncurses, a newline is treated badly, so we emulate it in our
     own way.  */
      if (c == '\n')
    {
      int x, y;

      getyx (stdscr, y, x);
      if (y + 1 == LINES)
        scroll (stdscr);
      else
        move (y + 1, x);
    }
      else if (isprint (c))
    {
      int x, y;

      getyx (stdscr, y, x);
      if (x + 1 == COLS)
        {
          console_putchar ('\r');
          console_putchar ('\n');
        }
      addch (c | console_current_color);
    }
      else
    {
      addch (c);
    }

#ifdef REFRESH_IMMEDIATELY
      refresh ();
#endif
    }
  else
#endif
    {
      /* CR is not used in Unix.  */
      if (c != '\r')
    putchar (c);
    }
}

/* The store for ungetch simulation. This is necessary, because
   ncurses-1.9.9g is still used in the world and its ungetch is
   completely broken.  */
#ifdef HAVE_LIBCURSES
static int save_char = ERR;
#endif

static int
console_translate_key (int c)
{
  switch (c)
    {
    case KEY_LEFT:
      return 2;
    case KEY_RIGHT:
      return 6;
    case KEY_UP:
      return 16;
    case KEY_DOWN:
      return 14;
    case KEY_DC:
      return 4;
    case KEY_BACKSPACE:
      return 8;
    case KEY_HOME:
      return 1;
    case KEY_END:
      return 5;
    case KEY_PPAGE:
      return 7;
    case KEY_NPAGE:
      return 3;
    default:
      break;
    }

  return c;
}

/* like 'getkey', but doesn't wait, returns -1 if nothing available */
int
console_checkkey (void)
{
#ifdef HAVE_LIBCURSES
  if (use_curses)
    {
      int c;

      /* Check for SAVE_CHAR. This should not be true, because this
     means checkkey is called twice continuously.  */
      if (save_char != ERR)
    return save_char;

      c = getch ();
      /* If C is not ERR, then put it back in the input queue.  */
      if (c != ERR)
    save_char = c;
      return console_translate_key (c);
    }
#endif

  /* Just pretend they hit the space bar, then read the real key when
     they call getkey. */
  return ' ';
}

/* returns packed BIOS/ASCII code */
int
console_getkey (void)
{
  int c;

#ifdef HAVE_LIBCURSES
  if (use_curses)
    {
      /* If checkkey has already got a character, then return it.  */
      if (save_char != ERR)
    {
      c = save_char;
      save_char = ERR;
      return console_translate_key (c);
    }

      wtimeout (stdscr, -1);
      c = getch ();
      wtimeout (stdscr, 100);
    }
  else
#endif
    c = getchar ();

  /* Quit if we get EOF. */
  if (c == -1)
    stop ();

  return console_translate_key (c);
}

/* returns packed values, LSB+1 is x, LSB is y */
int
console_getxy (void)
{
  int y, x;
#ifdef HAVE_LIBCURSES
  if (use_curses)
    getyx (stdscr, y, x);
  else
#endif
  y = x = 0;
  return (x << 8) | (y & 0xff);
}

void
console_gotoxy (int x, int y)
{
#ifdef HAVE_LIBCURSES
  if (use_curses)
    move (y, x);
#endif
}

/* low-level character I/O */
void
console_cls (void)
{
#ifdef HAVE_LIBCURSES
  if (use_curses)
    clear ();
#endif
}

void
console_setcolorstate (color_state state)
{
  console_current_color =
    (state == COLOR_STATE_HIGHLIGHT) ? A_REVERSE : A_NORMAL;
}

void
console_setcolor (int normal_color, int highlight_color)
{
  /* Nothing to do.  */
}

int
console_setcursor (int on)
{
  return 1;
}

/* Low-level disk I/O.  Our stubbed version just returns a file
   descriptor, not the actual geometry. */
int
get_diskinfo (int drive, struct geometry *geometry)
{
  /* FIXME: this function is truly horrid.  We try opening the device,
     then severely abuse the GEOMETRY->flags field to pass a file
     descriptor to biosdisk.  Thank God nobody's looking at this comment,
     or my reputation would be ruined. --Gord */

  /* See if we have a cached device. */
  if (disks[drive].flags == -1)
    {
      /* The unpartitioned device name: /dev/XdX */
      char *devname = device_map[drive];
      char buf[512];

      if (! devname)
    return -1;

      if (verbose)
    grub_printf ("Attempt to open drive 0x%x (%s)\n",
             drive, devname);

      /* Open read/write, or read-only if that failed. */
      if (! read_only)
    disks[drive].flags = open (devname, O_RDWR);

      if (disks[drive].flags == -1)
    {
      if (read_only || errno == EACCES || errno == EROFS || errno == EPERM)
        {
          disks[drive].flags = open (devname, O_RDONLY);
          if (disks[drive].flags == -1)
        {
          assign_device_name (drive, 0);
          return -1;
        }
        }
      else
        {
          assign_device_name (drive, 0);
          return -1;
        }
    }

      /* Attempt to read the first sector.  */
      if (read (disks[drive].flags, buf, 512) != 512)
    {
      close (disks[drive].flags);
      disks[drive].flags = -1;
      assign_device_name (drive, 0);
      return -1;
    }

      if (disks[drive].flags != -1)
    get_drive_geometry (&disks[drive], device_map, drive);
    }

  if (disks[drive].flags == -1)
    return -1;

#ifdef __linux__
  /* In Linux, invalidate the buffer cache, so that left overs
     from other program in the cache are flushed and seen by us */
  ioctl (disks[drive].flags, BLKFLSBUF, 0);
#endif

  *geometry = disks[drive];
  return 0;
}

/* Read LEN bytes from FD in BUF. Return less than or equal to zero if an
   error occurs, otherwise return LEN.  */
static int
nread (int fd, char *buf, size_t len)
{
  int size = len;

  while (len)
    {
      int ret = read (fd, buf, len);

      if (ret <= 0)
    {
      if (errno == EINTR)
        continue;
      else
        return ret;
    }

      len -= ret;
      buf += ret;
    }

  return size;
}

/* Write LEN bytes from BUF to FD. Return less than or equal to zero if an
   error occurs, otherwise return LEN.  */
static int
nwrite (int fd, char *buf, size_t len)
{
  int size = len;

  while (len)
    {
      int ret = write (fd, buf, len);

      if (ret <= 0)
    {
      if (errno == EINTR)
        continue;
      else
        return ret;
    }

      len -= ret;
      buf += ret;
    }

  return size;
}

/* Dump BUF in the format of hexadecimal numbers.  */
static void
hex_dump (void *buf, size_t size)
{
  /* FIXME: How to determine which length is readable?  */
#define MAX_COLUMN  70

  /* use unsigned char for numerical computations */
  unsigned char *ptr = buf;
  /* count the width of the line */
  int column = 0;
  /* how many bytes written */
  int count = 0;

  while (size > 0)
    {
      /* high 4 bits */
      int hi = *ptr >> 4;
      /* low 4 bits */
      int low = *ptr & 0xf;

      /* grub_printf does not handle prefix number, such as %2x, so
     format the number by hand...  */
      grub_printf ("%x%x", hi, low);
      column += 2;
      count++;
      ptr++;
      size--;

      /* Insert space or newline with the interval 4 bytes.  */
      if (size != 0 && (count % 4) == 0)
    {
      if (column < MAX_COLUMN)
        {
          grub_printf (" ");
          column++;
        }
      else
        {
          grub_printf ("\n");
          column = 0;
        }
    }
    }

  /* Add a newline at the end for readability.  */
  grub_printf ("\n");
}

int
biosdisk (int subfunc, int drive, struct geometry *geometry,
      unsigned long long sector, int nsec, int segment)
{
  char *buf;
  int fd = geometry->flags;

  /* Get the file pointer from the geometry, and make sure it matches. */
  if (fd == -1 || fd != disks[drive].flags)
    return BIOSDISK_ERROR_GEOMETRY;

  /* Seek to the specified location. */
#if defined(__linux__) && (!defined(__GLIBC__) || \
    ((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1))))
  /* Maybe libc doesn't have large file support.  */
  {
    loff_t offset, result;
    static int _llseek (uint filedes, ulong hi, ulong lo,
            loff_t *res, uint wh);
    _syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo,
           loff_t *, res, uint, wh);

    offset = (loff_t) sector * (loff_t) SECTOR_SIZE;
    if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET))
      return -1;
  }
#else
  {
    off_t offset = (off_t) sector * (off_t) SECTOR_SIZE;

    if (lseek (fd, offset, SEEK_SET) != offset)
      return -1;
  }
#endif

  buf = (char *) (segment << 4);

  switch (subfunc)
    {
    case BIOSDISK_READ:
#ifdef __linux__
      if (sector == 0 && nsec > 1)
    {
      /* Work around a bug in linux's ez remapping.  Linux remaps all
         sectors that are read together with the MBR in one read.  It
         should only remap the MBR, so we split the read in two
         parts. -jochen  */
      if (nread (fd, buf, SECTOR_SIZE) != SECTOR_SIZE)
        return -1;
      buf += SECTOR_SIZE;
      nsec--;
    }
#endif
      if (nread (fd, buf, nsec * SECTOR_SIZE) != nsec * SECTOR_SIZE)
    return -1;
      break;

    case BIOSDISK_WRITE:
      if (verbose)
    {
      grub_printf ("Write %d sectors starting from %u sector"
               " to drive 0x%x (%s)\n",
               nsec, sector, drive, device_map[drive]);
      hex_dump (buf, nsec * SECTOR_SIZE);
    }
      if (! read_only)
    if (nwrite (fd, buf, nsec * SECTOR_SIZE) != nsec * SECTOR_SIZE)
      return -1;
      break;

    default:
      grub_printf ("unknown subfunc %d\n", subfunc);
      break;
    }

  return 0;
}


void
stop_floppy (void)
{
  /* NOTUSED */
}

/* Fetch a key from a serial device.  */
int
serial_hw_fetch (void)
{
  fd_set fds;
  struct timeval to;
  char c;

  /* Wait only for the serial device.  */
  FD_ZERO (&fds);
  FD_SET (serial_fd, &fds);

  to.tv_sec = 0;
  to.tv_usec = 0;

  if (select (serial_fd + 1, &fds, 0, 0, &to) > 0)
    {
      if (nread (serial_fd, &c, 1) != 1)
    stop ();

      return c;
    }

  return -1;
}

/* Put a character to a serial device.  */
void
serial_hw_put (int c)
{
  char ch = (char) c;

  if (nwrite (serial_fd, &ch, 1) != 1)
    stop ();
}

void
serial_hw_delay (void)
{
#ifdef SIMULATE_SLOWNESS_OF_SERIAL
  struct timeval otv, tv;

  gettimeofday (&otv, 0);

  while (1)
    {
      long delta;

      gettimeofday (&tv, 0);
      delta = tv.tv_usec - otv.tv_usec;
      if (delta < 0)
    delta += 1000000;

      if (delta >= 1000000 / (serial_speed >> 3))
    break;
    }
#endif /* SIMULATE_SLOWNESS_OF_SERIAL */
}

static speed_t
get_termios_speed (int speed)
{
  switch (speed)
    {
    case 2400: return B2400;
    case 4800: return B4800;
    case 9600: return B9600;
    case 19200: return B19200;
    case 38400: return B38400;
#ifdef B57600
    case 57600: return B57600;
#endif
#ifdef B115200
    case 115200: return B115200;
#endif
    }

  return B0;
}

/* Get the port number of the unit UNIT. In the grub shell, this doesn't
   make sense.  */
unsigned short
serial_hw_get_port (int unit)
{
  return 0;
}

/* Initialize a serial device. In the grub shell, PORT is unused.  */
int
serial_hw_init (unsigned short port, unsigned int speed,
        int word_len, int parity, int stop_bit_len)
{
  struct termios termios;
  speed_t termios_speed;
  int i;

  /* Check if the file name is specified.  */
  if (! serial_device)
    return 0;

  /* If a serial device is already opened, close it first.  */
  if (serial_fd >= 0)
    close (serial_fd);

  /* Open the device file.  */
  serial_fd = open (serial_device,
            O_RDWR | O_NOCTTY
#if defined(O_SYNC)
            /* O_SYNC is used in Linux (and some others?).  */
            | O_SYNC
#elif defined(O_FSYNC)
            /* O_FSYNC is used in FreeBSD.  */
            | O_FSYNC
#endif
            );
  if (serial_fd < 0)
    return 0;

  /* Get the termios parameters.  */
  if (tcgetattr (serial_fd, &termios))
    goto fail;

  /* Raw mode.  */
#if defined(__sun)
  termios.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
  termios.c_oflag &= ~OPOST;
  termios.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
  termios.c_cflag &= ~(CSIZE|PARENB);
  termios.c_cflag |= CS8;
#else
  cfmakeraw (&termios);
#endif

  /* Set the speed.  */
  termios_speed = get_termios_speed (speed);
  if (termios_speed == B0)
    goto fail;

  cfsetispeed (&termios, termios_speed);
  cfsetospeed (&termios, termios_speed);

  /* Set the word length.  */
  termios.c_cflag &= ~CSIZE;
  switch (word_len)
    {
    case UART_5BITS_WORD:
      termios.c_cflag |= CS5;
      break;
    case UART_6BITS_WORD:
      termios.c_cflag |= CS6;
      break;
    case UART_7BITS_WORD:
      termios.c_cflag |= CS7;
      break;
    case UART_8BITS_WORD:
      termios.c_cflag |= CS8;
      break;
    default:
      goto fail;
    }

  /* Set the parity.  */
  switch (parity)
    {
    case UART_NO_PARITY:
      termios.c_cflag &= ~PARENB;
      break;
    case UART_ODD_PARITY:
      termios.c_cflag |= PARENB;
      termios.c_cflag |= PARODD;
      break;
    case UART_EVEN_PARITY:
      termios.c_cflag |= PARENB;
      termios.c_cflag &= ~PARODD;
      break;
    default:
      goto fail;
    }

  /* Set the length of stop bit.  */
  switch (stop_bit_len)
    {
    case UART_1_STOP_BIT:
      termios.c_cflag &= ~CSTOPB;
      break;
    case UART_2_STOP_BITS:
      termios.c_cflag |= CSTOPB;
      break;
    default:
      goto fail;
    }

  /* Set the parameters.  */
  if (tcsetattr (serial_fd, TCSANOW, &termios))
    goto fail;

#ifdef SIMULATE_SLOWNESS_OF_SERIAL
  serial_speed = speed;
#endif /* SIMUATE_SLOWNESS_OF_SERIAL */

  /* Get rid of the flag TERM_NEED_INIT from the serial terminal.  */
  for (i = 0; term_table[i].name; i++)
    {
      if (strcmp (term_table[i].name, "serial") == 0)
    {
      term_table[i].flags &= ~(TERM_NEED_INIT);
      break;
    }
    }

  return 1;

 fail:
  close (serial_fd);
  serial_fd = -1;
  return 0;
}

/* Set the file name of a serial device (or a pty device). This is a
   function specific to the grub shell.  */
void
serial_set_device (const char *device)
{
  if (serial_device)
    free (serial_device);

  serial_device = strdup (device);
}

/* There is no difference between console and hercules in the grub shell.  */
void
hercules_putchar (int c)
{
  console_putchar (c);
}

int
hercules_getxy (void)
{
  return console_getxy ();
}

void
hercules_gotoxy (int x, int y)
{
  console_gotoxy (x, y);
}

void
hercules_cls (void)
{
  console_cls ();
}

void
hercules_setcolorstate (color_state state)
{
  console_setcolorstate (state);
}

void
hercules_setcolor (int normal_color, int highlight_color)
{
  console_setcolor (normal_color, highlight_color);
}

int
hercules_setcursor (int on)
{
  return 1;
}

uint32_t amd64_cpuid_supported(void)
{
  /* Nothing to do in the simulator. */
    return (1);
}

void amd64_cpuid_insn(uint32_t i, void * r)
{
  /* Nothing to do in the simulator. */
}

void amd64_rdmsr(uint32_t i, uint64_t * p)
{
  /* Nothing to do in the simulator. */
}

void amd64_wrmsr(uint32_t i, const uint64_t * p)
{
  /* Nothing to do in the simulator. */
}

int get_target_operating_mode(void)
{
  /* Nothing to do in the simulator. */
    return (1);
}