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/*
* (C) Copyright 1992, ..., 2007 the "DOSEMU-Development-Team".
*
* for details see file COPYING.DOSEMU in the DOSEMU distribution
*/
/*
* Extensions by Robert Sanders, 1992-93
*
* DANG_BEGIN_MODULE
*
* REMARK
* Here is where DOSEMU gets booted. From emu.c external calls are made to
* the specific I/O systems (video/keyboard/serial/etc...) to initialize
* them. Memory is cleared/set up and the boot sector is read from the
* boot drive. Many SIGNALS are set so that DOSEMU can exploit things like
* timers, I/O signals, illegal instructions, etc... When every system
* gives the green light, vm86() is called to switch into vm86 mode and
* start executing i86 code.
*
* The vm86() function will return to DOSEMU when certain `exceptions` occur
* as when some interrupt instructions occur (0xcd).
*
* The top level function emulate() is called from dos.c by way of a dll
* entry point.
*
* /REMARK
* DANG_END_MODULE
*
*/
/*
* DANG_BEGIN_REMARK
* DOSEMU must not work within the 1 meg DOS limit, so
* start of code is loaded at a higher address, at some time this could
* conflict with other shared libs. If DOSEMU is compiled statically
* (without shared libs), and org instruction is used to provide the jump
* above 1 meg.
* DANG_END_REMARK
*/
#include "config.h"
#ifndef __ELF__
/*
* DANG_BEGIN_FUNCTION jmp_emulate
*
* description: This function allows the startup program `dos` to know how to
* call the emulate function by way of the dll headers. Always make sure
* that this line is the first of emu.c and link emu.o as the first object
* file to the lib
*
* DANG_END_FUNCTION
*/
__asm__("___START___: jmp _emulate\n");
#endif
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#ifndef EDEADLOCK
#define EDEADLOCK EDEADLK
#endif
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <limits.h>
#include <getopt.h>
#include <assert.h>
#include <locale.h>
#ifdef __linux__
#include <sys/vt.h>
#include <sys/kd.h>
#include "Linux/fd.h"
#include "Linux/hdreg.h"
#include <syscall.h>
#endif
#include "version.h"
#include "memory.h"
#ifdef USE_MHPDBG
#include "mhpdbg.h"
#endif
#include "debug.h"
#include "emu.h"
#include "vm86plus.h"
#include "bios.h"
#include "termio.h"
#include "video.h"
#include "timers.h"
#include "cmos.h"
#include "mouse.h"
#include "disks.h"
#include "xms.h"
#include "ipx.h" /* TRB - add support for ipx */
#include "serial.h"
#include "int.h"
#include "bitops.h"
#include "pic.h"
#include "dpmi.h"
#include "priv.h" /* for priv_init */
#include "port.h" /* for port_init */
#include "pci.h"
#include "speaker.h"
#include "utilities.h"
#include "dos2linux.h"
#include "iodev.h"
#include "mapping.h"
#include "dosemu_config.h"
#include "userhook.h"
#include "pktdrvr.h"
#include "dma.h"
#include "hlt.h"
#include "keyb_server.h"
#include "keyb_clients.h"
#ifdef USE_SBEMU
#include "sound.h"
#endif
#ifdef X86_EMULATOR
#include "cpu-emu.h"
#endif
sigjmp_buf NotJEnv;
void
boot(void)
{
unsigned buffer;
struct disk *dp = NULL;
switch (config.hdiskboot) {
case 0:
if (config.bootdisk)
dp = &bootdisk;
else
dp = &disktab[0];
break;
case 1:
dp = &hdisktab[0];
break;
case 2:
dp = &disktab[1];
break;
default:
error("unexpected value for config.hdiskboot\n");
leavedos(15);
}
disk_close();
disk_open(dp);
buffer = 0x7c00;
if (dp->boot_name) {/* Boot from the specified file */
int bfd;
d_printf ("Booting from bootfile=%s...\n",dp->boot_name);
bfd = open (dp->boot_name, O_RDONLY);
if (bfd == -1) {/* Abort with error */
error("Boot file %s missing\n",dp->boot_name);
leavedos(16);
}
if (dos_read(bfd, buffer, SECTOR_SIZE) != SECTOR_SIZE) {
error("Failed to read exactly %d bytes from %s\n",
SECTOR_SIZE, dp->boot_name);
leavedos(16);
}
close(bfd);
}
else
if (dp->type == PARTITION) {/* we boot partition boot record, not MBR! */
d_printf("Booting partition boot record from part=%s....\n", dp->dev_name);
if (dos_read(dp->fdesc, buffer, SECTOR_SIZE) != SECTOR_SIZE) {
error("reading partition boot sector using partition %s.\n", dp->dev_name);
leavedos(16);
}
} else if (read_sectors(dp, buffer, 0, 0, 0, 1) != SECTOR_SIZE) {
error("can't boot from %s, using harddisk\n", dp->dev_name);
dp = hdisktab;
if (read_sectors(dp, buffer, 0, 0, 0, 1) != SECTOR_SIZE) {
error("can't boot from hard disk\n");
leavedos(16);
}
}
disk_close();
}
static inline void
vm86plus_init(void)
{
#ifdef __i386__
if (!vm86_plus(VM86_PLUS_INSTALL_CHECK,0)) return;
if (!syscall(SYS_vm86old, (void *)0xffffff01)) {
fprintf(stderr, "your kernel contains an older (interim) vm86plus version\n\r"
"please upgrade to an newer one\n\r");
}
else
#endif
{
#ifdef X86_EMULATOR
warn("WARN: vm86plus service not available in your kernel\n");
warn("WARN: using CPU emulation for vm86()\n");
if (config.cpuemu < 3) {
config.cpuemu = 3;
}
if (config.cpuemu < 3) config.cpuemu = 3;
return;
#else
fprintf(stderr, "vm86plus service not available in your kernel\n\r");
#endif
}
fflush(stdout);
fflush(stderr);
_exit(1);
}
static inline void
module_init(void)
{
vm86plus_init(); /* emumodule support */
memcheck_init(); /* lower 1M memory map support */
}
void do_liability_disclaimer_prompt(int dosboot, int prompt)
{
FILE *f;
char buf[32];
char *disclaimer_file_name;
static char text[] =
"\nWelcome to DOSEMU "VERSTR", a DOS emulator"
#ifdef __linux__
" for Linux"
#endif
".\nCopyright (C) 1992-2006 the 'DOSEMU-Development-Team'.\n"
"This program is distributed in the hope that it will be useful,\n"
"but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the file\n"
"/usr/share/doc/dosemu/copyright for more details.\n"
"Use this program at your own risk!\n\n";
static char text2[] =
"Press ENTER to confirm, and boot DOSEMU, or [Ctrl-C] to abort\n";
disclaimer_file_name = assemble_path(LOCALDIR, "disclaimer", 0);
if (exists_file(disclaimer_file_name)) {
free(disclaimer_file_name);
return;
}
if (dosboot) {
p_dos_str("%s", text);
} else {
fputs(text, stdout);
}
buf[0] = '\0';
if (prompt) {
if (dosboot) {
p_dos_str("%s", text2);
com_biosread(buf, sizeof(buf)-2);
} else {
fputs(text2, stdout);
fgets(buf, sizeof(buf), stdin);
}
if (buf[0] == 3) {
leavedos(1);
}
}
/*
* We now remember this by writing the above text to a
* in LOCALDIR/disclaimer
*/
f = fopen(disclaimer_file_name, "w");
if (!f) {
fprintf(stderr, "cannot create %s\n", disclaimer_file_name);
leavedos(1);
}
fprintf(f, "%s%s\n", text, buf);
fclose(f);
free(disclaimer_file_name);
}
/*
* DANG_BEGIN_FUNCTION emulate
*
* arguments:
* argc - Argument count.
* argv - Arguments.
*
* description:
* Emulate gets called from dos.c. It initializes DOSEMU to
* prepare it for running in vm86 mode. This involves catching signals,
* preparing memory, calling all the initialization functions for the I/O
* subsystems (video/serial/etc...), getting the boot sector instructions
* and calling vm86().
*
* DANG_END_FUNCTION
*
*/
#ifdef __ELF__
int
main(int argc, char **argv)
#else
int
emulate(int argc, char **argv)
#endif
{
char *signalstack[16384];
int e;
srand(time(NULL));
memset(&config, 0, sizeof(config));
cstack = &signalstack;
/* zero signal stack to check for %cs x86-64 kernel <= 2.6.14 problem */
memset(signalstack, 0, sizeof(signalstack));
if ((e=sigsetjmp(NotJEnv, 1))) {
flush_log();
fprintf(stderr,"EMERGENCY JUMP %x!!!\n",e);
/* there's no other way to stop a signal 11 from hanging dosemu
* but politely ask the kernel to terminate ourselves */
kill(0, SIGKILL);
_exit(1); /* just in case */
}
setlocale(LC_ALL,"");
/* NOW! it is safe to touch the priv code. */
priv_init(); /* This must come first! */
/* Before we even try to give options to the parser,
* we pre-filter some dangerous options and delete them
* from the arguments list
*/
secure_option_preparse(&argc, argv);
/* This has to come next:
* Parse dosemu.users _before_ any argument usage to catch
* a not allowed user playing with overruns and kick him out
* Additionally, we check a non-suid root condition, if dosemu.user
* says so and exit if needed.
*/
parse_dosemu_users();
/* the transposal of (config_|stdio_)init allows the addition of -o */
/* to specify a debug out filename, if you're wondering */
get_time_init(); /* debug can use CPUtime */
io_select_init();
port_init(); /* setup port structures, before config! */
version_init(); /* Check the OS version */
config_init(argc, argv); /* parse the commands & config file(s) */
#ifdef X86_EMULATOR
#ifdef DONT_DEBUG_BOOT /* cpuemu only */
memcpy(&debug_save, &debug, sizeof(debug));
set_debug_level('e', 0);
#ifdef TRACE_DPMI
set_debug_level('t', 0);
#endif
#endif
#endif
get_time_init();
stdio_init(); /* initialize stdio & open debug file */
print_version(); /* log version information */
module_init();
time_setting_init(); /* get the startup time */
cpu_setup(); /* setup the CPU */
pci_setup();
device_init(); /* priv initialization of video etc. */
extra_port_init(); /* setup ports dependent on config */
SIG_init(); /* priv part of the signal init */
pkt_priv_init();
/* here we include the hooks to possible plug-ins */
#include "plugin_init.h"
if (config.exitearly) {
dbug_printf("Leaving DOS before booting\n");
leavedos(0);
}
mapping_init(); /* initialize mapping drivers */
low_mem_init(); /* initialize the lower 1Meg */
if (can_do_root_stuff && !under_root_login) {
g_printf("dropping root privileges\n");
open_kmem();
}
priv_drop();
map_hardware_ram(); /* map the direct hardware ram */
map_video_bios(); /* map (really: copy) the video bios */
close_kmem();
/*
* Do the 'liability disclaimer' stuff we need to avoid problems
* with laws in some countries.
*
* show it at the beginning only for terminals and direct console
* else the banner code in int.c does it.
*/
if (!config.X)
install_dos(0);
hlt_init();
HMA_init(); /* HMA can only be done now after mapping
is initialized*/
memory_init(); /* initialize the memory contents */
/* iodev_init() can load plugins, like SDL, that can spawn a thread.
* This must be done before initializing signals, or problems ensue.
* This also must be done when the signals are blocked, so after
* the io_select_init(), which right now blocks the signals. */
iodev_init(); /* initialize devices */
signal_init(); /* initialize sig's & sig handlers */
ems_init(); /* initialize ems */
xms_init(); /* initialize xms */
dpmi_setup();
if (not_use_sigio)
k_printf("Atleast 1 NON-SIGIO file handle in use.\n");
else
k_printf("No NON-SIGIO file handles in use.\n");
g_printf("EMULATE\n");
fflush(stdout);
#ifdef USE_MHPDBG
mhp_debug(DBG_INIT, 0, 0);
#endif
timer_interrupt_init(); /* start sending int 8h int signals */
/* unprotect conventional memory just before booting */
mprotect_mapping(MAPPING_LOWMEM, mem_base, config.mem_size * 1024,
PROT_READ | PROT_WRITE | PROT_EXEC);
/* check DOSDRIVE_D (used to be done in the script) */
if (getenv("HOME"))
setenv("DOSDRIVE_D", getenv("HOME"), 0);
while (!fatalerr && !config.exitearly) {
loopstep_run_vm86();
}
if (fatalerr) {
sync();
fprintf(stderr, "Not a good day to die!!!!!\n");
}
leavedos(99);
return 0; /* just to make gcc happy */
}
void
dos_ctrl_alt_del(void)
{
dbug_printf("DOS ctrl-alt-del requested. Rebooting!\n");
while (in_dpmi) {
in_dpmi_dos_int = 1;
dpmi_cleanup();
}
cpu_reset();
}
/* "graceful" shutdown */
void __leavedos(int sig, const char *s, int num)
{
struct itimerval itv;
if (in_leavedos)
{
error("leavedos called recursively, forgetting the graceful exit!\n");
_exit(1);
}
in_leavedos++;
dbug_printf("leavedos(%s|%i) called - shutting down\n", s, num);
#if 1 /* BUG CATCHER */
if (in_vm86) {
g_printf("\nkilled while in vm86(), trying to dump DOS-registers:\n");
show_regs(__FILE__, __LINE__);
}
#endif
in_vm86 = 0;
/* try to notify dosdebug */
#ifdef USE_MHPDBG
if (fault_cnt > 0)
dbug_printf("leavedos() called from within a signal context!\n");
else
mhp_exit_intercept(sig);
g_printf("closing debugger pipes\n");
mhp_close();
#endif
itv.it_interval.tv_sec = itv.it_interval.tv_usec = 0;
itv.it_value = itv.it_interval;
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
g_printf("can't turn off timer at shutdown: %s\n", strerror(errno));
}
registersig(SIGALRM, NULL);
/* here we include the hooks to possible plug-ins */
#include "plugin_close.h"
if (config.speaker == SPKR_EMULATED) {
g_printf("SPEAKER: sound off\n");
speaker_off(); /* turn off any sound */
}
else if (config.speaker==SPKR_NATIVE) {
g_printf("SPEAKER: sound off\n");
/* Since the speaker is native hardware use port manipulation,
* we don't know what is actually implementing the kernel's
* ioctls.
* My port logic is actually stolen from kd_nosound in the kernel.
* --EB 21 September 1997
*/
if (portserver_pid)
port_safe_outb(0x61, port_safe_inb(0x61)&0xFC); /* turn off any sound */
}
#ifdef SIG
g_printf("calling SIG_close\n");
#endif
SIG_close();
/* try to regain control of keyboard and video first */
g_printf("calling keyboard_close\n");
iodev_term();
#if defined(X86_EMULATOR)
/* if we are here with config.cpuemu>1 something went wrong... */
if (config.cpuemu>1) {
leave_cpu_emu();
}
#endif
show_ints(0, 0x33);
g_printf("calling disk_close_all\n");
disk_close_all();
if (config.emuretrace) {
do_r3da_pending ();
set_ioperm (0x3da, 1, 1);
set_ioperm (0x3c0, 1, 1);
config.emuretrace = 0;
}
/* terminate port server */
port_exit();
g_printf("releasing ports and blocked devices\n");
release_ports();
g_printf("calling shared memory exit\n");
g_printf("calling HMA exit\n");
hma_exit();
close_uhook();
g_printf("calling mapping_close()\n");
mapping_close();
if (config.detach) {
restore_vt(config.detach);
disallocate_vt();
}
#ifdef IPX
ipx_close();
#endif
g_printf("calling close_all_printers\n");
close_all_printers();
flush_log();
/* We don't need to use _exit() here; this is the graceful exit path. */
exit(sig);
}
#if 0
/* check the fd for data ready for reading */
int
d_ready(int fd)
{
int selrtn;
struct timeval w_time;
fd_set checkset;
w_time.tv_sec = 0;
w_time.tv_usec = 200000;
FD_ZERO(&checkset);
FD_SET(fd, &checkset);
do {
selrtn = select(fd + 1, &checkset, NULL, NULL, &w_time);
} while(selrtn == -1 && errno == EINTR);
if (selrtn == 1) {
if (FD_ISSET(fd, &checkset))
return (1);
else
return (0);
} else
return (0);
}
void activate(int con_num)
{
ioctl(kbd_fd, VT_ACTIVATE, con_num);
}
#endif
void hardware_run(void)
{
dma_run ();
#ifdef USE_SBEMU
run_sb(); /* Beat Karcher to this one .. 8-) - AM */
#endif
keyb_server_run();
rtc_run();
}
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