monitor.c - qemu - Git at Google

 /*
  * QEMU monitor
  *
  * Copyright (c) 2003-2004 Fabrice Bellard
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <string.h>
 #include <getopt.h>
 #include <inttypes.h>
 #include <unistd.h>
 #include <sys/mman.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <time.h>
 #include <sys/time.h>
 #include <malloc.h>
 #include <termios.h>
 #include <sys/poll.h>
 #include <errno.h>
 #include <ctype.h>

 #include "cpu.h"
 #include "vl.h"

 //#define DEBUG

 #define TERM_CMD_BUF_SIZE 4095
 #define MAX_ARGS 64

 #define IS_NORM 0
 #define IS_ESC  1
 #define IS_CSI  2

 #define printf do_not_use_printf

 static char term_cmd_buf[TERM_CMD_BUF_SIZE + 1];
 static int term_cmd_buf_index;
 static int term_cmd_buf_size;
 static int term_esc_state;
 static int term_esc_param;

 typedef struct term_cmd_t {
     const char *name;
     void (*handler)(int argc, const char **argv);
     const char *params;
     const char *help;
 } term_cmd_t;

 static term_cmd_t term_cmds[];
 static term_cmd_t info_cmds[];

 void term_printf(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
     vprintf(fmt, ap);
     va_end(ap);
 }

 void term_flush(void)
 {
     fflush(stdout);
 }

 static int compare_cmd(const char *name, const char *list)
 {
     const char *p, *pstart;
     int len;
     len = strlen(name);
     p = list;
     for(;;) {
         pstart = p;
         p = strchr(p, '|');
         if (!p)
             p = pstart + strlen(pstart);
         if ((p - pstart) == len && !memcmp(pstart, name, len))
             return 1;
         if (*p == '\0')
             break;
         p++;
     }
     return 0;
 }

 static void help_cmd1(term_cmd_t *cmds, const char *prefix, const char *name)
 {
     term_cmd_t *cmd;

     for(cmd = cmds; cmd->name != NULL; cmd++) {
         if (!name || !strcmp(name, cmd->name))
             term_printf("%s%s %s -- %s\n", prefix, cmd->name, cmd->params, cmd->help);
     }
 }

 static void help_cmd(const char *name)
 {
     if (name && !strcmp(name, "info")) {
         help_cmd1(info_cmds, "info ", NULL);
     } else {
         help_cmd1(term_cmds, "", name);
     }
 }

 static void do_help(int argc, const char **argv)
 {
     help_cmd(argv[1]);
 }

 static void do_commit(int argc, const char **argv)
 {
     int i;

     for (i = 0; i < MAX_DISKS; i++) {
         if (bs_table[i])
             bdrv_commit(bs_table[i]);
     }
 }

 static void do_info(int argc, const char **argv)
 {
     term_cmd_t *cmd;
     const char *item;

     if (argc < 2)
         goto help;
     item = argv[1];
     for(cmd = info_cmds; cmd->name != NULL; cmd++) {
         if (compare_cmd(argv[1], cmd->name))
             goto found;
     }
  help:
     help_cmd(argv[0]);
     return;
  found:
     cmd->handler(argc, argv);
 }

 static void do_info_network(int argc, const char **argv)
 {
     int i, j;
     NetDriverState *nd;

     for(i = 0; i < nb_nics; i++) {
         nd = &nd_table[i];
         term_printf("%d: ifname=%s macaddr=", i, nd->ifname);
         for(j = 0; j < 6; j++) {
             if (j > 0)
                 term_printf(":");
             term_printf("%02x", nd->macaddr[j]);
         }
         term_printf("\n");
     }
 }

 static void do_info_block(int argc, const char **argv)
 {
     bdrv_info();
 }

 static void do_quit(int argc, const char **argv)
 {
     exit(0);
 }

 static int eject_device(BlockDriverState *bs, int force)
 {
     if (bdrv_is_inserted(bs)) {
         if (!force) {
             if (!bdrv_is_removable(bs)) {
                 term_printf("device is not removable\n");
                 return -1;
             }
             if (bdrv_is_locked(bs)) {
                 term_printf("device is locked\n");
                 return -1;
             }
         }
         bdrv_close(bs);
     }
     return 0;
 }

 static void do_eject(int argc, const char **argv)
 {
     BlockDriverState *bs;
     const char **parg;
     int force;

     parg = argv + 1;
     if (!*parg) {
     fail:
         help_cmd(argv[0]);
         return;
     }
     force = 0;
     if (!strcmp(*parg, "-f")) {
         force = 1;
         parg++;
     }
     if (!*parg)
         goto fail;
     bs = bdrv_find(*parg);
     if (!bs) {
         term_printf("device not found\n");
         return;
     }
     eject_device(bs, force);
 }

 static void do_change(int argc, const char **argv)
 {
     BlockDriverState *bs;

     if (argc != 3) {
         help_cmd(argv[0]);
         return;
     }
     bs = bdrv_find(argv[1]);
     if (!bs) {
         term_printf("device not found\n");
         return;
     }
     if (eject_device(bs, 0) < 0)
         return;
     bdrv_open(bs, argv[2], 0);
 }

 static void do_screen_dump(int argc, const char **argv)
 {
     if (argc != 2) {
         help_cmd(argv[0]);
         return;
     }
     vga_screen_dump(argv[1]);
 }

 static term_cmd_t term_cmds[] = {
     { "help|?", do_help,
       "[cmd]", "show the help" },
     { "commit", do_commit,
       "", "commit changes to the disk images (if -snapshot is used)" },
     { "info", do_info,
       "subcommand", "show various information about the system state" },
     { "q|quit", do_quit,
       "", "quit the emulator" },
     { "eject", do_eject,
       "[-f] device", "eject a removable media (use -f to force it)" },
     { "change", do_change,
       "device filename", "change a removable media" },
     { "screendump", do_screen_dump,
       "filename", "save screen into PPM image 'filename'" },
     { NULL, NULL, },
 };

 static term_cmd_t info_cmds[] = {
     { "network", do_info_network,
       "", "show the network state" },
     { "block", do_info_block,
       "", "show the block devices" },
     { NULL, NULL, },
 };

 static void term_handle_command(char *cmdline)
 {
     char *p, *pstart;
     int argc;
     const char *args[MAX_ARGS + 1];
     term_cmd_t *cmd;

 #ifdef DEBUG
     term_printf("command='%s'\n", cmdline);
 #endif

     /* split command in words */
     argc = 0;
     p = cmdline;
     for(;;) {
         while (isspace(*p))
             p++;
         if (*p == '\0')
             break;
         pstart = p;
         while (*p != '\0' && !isspace(*p))
             p++;
         args[argc] = pstart;
         argc++;
         if (argc >= MAX_ARGS)
             break;
         if (*p == '\0')
             break;
         *p++ = '\0';
     }
     args[argc] = NULL;
 #ifdef DEBUG
     for(i=0;i<argc;i++) {
         term_printf(" '%s'", args[i]);
     }
     term_printf("\n");
 #endif
     if (argc <= 0)
         return;
     for(cmd = term_cmds; cmd->name != NULL; cmd++) {
         if (compare_cmd(args[0], cmd->name))
             goto found;
     }
     term_printf("unknown command: '%s'\n", args[0]);
     return;
  found:
     cmd->handler(argc, args);
 }

 static void term_show_prompt(void)
 {
     term_printf("(qemu) ");
     fflush(stdout);
     term_cmd_buf_index = 0;
     term_cmd_buf_size = 0;
     term_esc_state = IS_NORM;
 }

 static void term_insert_char(int ch)
 {
     if (term_cmd_buf_index < TERM_CMD_BUF_SIZE) {
         memmove(term_cmd_buf + term_cmd_buf_index + 1,
                 term_cmd_buf + term_cmd_buf_index,
                 term_cmd_buf_size - term_cmd_buf_index);
         term_cmd_buf[term_cmd_buf_index] = ch;
         term_cmd_buf_size++;
         term_printf("\033[@%c", ch);
         term_cmd_buf_index++;
         term_flush();
     }
 }

 static void term_backward_char(void)
 {
     if (term_cmd_buf_index > 0) {
         term_cmd_buf_index--;
         term_printf("\033[D");
         term_flush();
     }
 }

 static void term_forward_char(void)
 {
     if (term_cmd_buf_index < term_cmd_buf_size) {
         term_cmd_buf_index++;
         term_printf("\033[C");
         term_flush();
     }
 }

 static void term_delete_char(void)
 {
     if (term_cmd_buf_index < term_cmd_buf_size) {
         memmove(term_cmd_buf + term_cmd_buf_index,
                 term_cmd_buf + term_cmd_buf_index + 1,
                 term_cmd_buf_size - term_cmd_buf_index - 1);
         term_printf("\033[P");
         term_cmd_buf_size--;
         term_flush();
     }
 }

 static void term_backspace(void)
 {
     if (term_cmd_buf_index > 0) {
         term_backward_char();
         term_delete_char();
     }
 }

 static void term_bol(void)
 {
     while (term_cmd_buf_index > 0)
         term_backward_char();
 }

 static void term_eol(void)
 {
     while (term_cmd_buf_index < term_cmd_buf_size)
         term_forward_char();
 }

 /* return true if command handled */
 static void term_handle_byte(int ch)
 {
     switch(term_esc_state) {
     case IS_NORM:
         switch(ch) {
         case 1:
             term_bol();
             break;
         case 5:
             term_eol();
             break;
         case 10:
         case 13:
             term_cmd_buf[term_cmd_buf_size] = '\0';
             term_printf("\n");
             term_handle_command(term_cmd_buf);
             term_show_prompt();
             break;
         case 27:
             term_esc_state = IS_ESC;
             break;
         case 127:
         case 8:
             term_backspace();
             break;
         default:
             if (ch >= 32) {
                 term_insert_char(ch);
             }
             break;
         }
         break;
     case IS_ESC:
         if (ch == '[') {
             term_esc_state = IS_CSI;
             term_esc_param = 0;
         } else {
             term_esc_state = IS_NORM;
         }
         break;
     case IS_CSI:
         switch(ch) {
         case 'D':
             term_backward_char();
             break;
         case 'C':
             term_forward_char();
             break;
         case '0' ... '9':
             term_esc_param = term_esc_param * 10 + (ch - '0');
             goto the_end;
         case '~':
             switch(term_esc_param) {
             case 1:
                 term_bol();
                 break;
             case 3:
                 term_delete_char();
                 break;
             case 4:
                 term_eol();
                 break;
             }
             break;
         default:
             break;
         }
         term_esc_state = IS_NORM;
     the_end:
         break;
     }
 }

 /*************************************************************/
 /* serial console support */

 #define TERM_ESCAPE 0x01 /* ctrl-a is used for escape */

 static int term_got_escape, term_command;

 void term_print_help(void)
 {
     term_printf("\n"
                 "C-a h    print this help\n"
                 "C-a x    exit emulatior\n"
                 "C-a d    switch on/off debug log\n"
                 "C-a s    save disk data back to file (if -snapshot)\n"
                 "C-a b    send break (magic sysrq)\n"
                 "C-a c    switch between console and monitor\n"
                 "C-a C-a  send C-a\n"
                 );
 }

 /* called when a char is received */
 static void term_received_byte(int ch)
 {
     if (!serial_console) {
         /* if no serial console, handle every command */
         term_handle_byte(ch);
     } else {
         if (term_got_escape) {
             term_got_escape = 0;
             switch(ch) {
             case 'h':
                 term_print_help();
                 break;
             case 'x':
                 exit(0);
                 break;
             case 's':
                 {
                     int i;
                     for (i = 0; i < MAX_DISKS; i++) {
                         if (bs_table[i])
                             bdrv_commit(bs_table[i]);
                     }
                 }
                 break;
             case 'b':
                 if (serial_console)
                     serial_receive_break(serial_console);
                 break;
             case 'c':
                 if (!term_command) {
                     term_show_prompt();
                     term_command = 1;
                 } else {
                     term_command = 0;
                 }
                 break;
             case 'd':
                 cpu_set_log(CPU_LOG_ALL);
                 break;
             case TERM_ESCAPE:
                 goto send_char;
             }
         } else if (ch == TERM_ESCAPE) {
             term_got_escape = 1;
         } else {
         send_char:
             if (term_command) {
                 term_handle_byte(ch);
             } else {
                 if (serial_console)
                     serial_receive_byte(serial_console, ch);
             }
         }
     }
 }

 static int term_can_read(void *opaque)
 {
     if (serial_console) {
         return serial_can_receive(serial_console);
     } else {
         return 1;
     }
 }

 static void term_read(void *opaque, const uint8_t *buf, int size)
 {
     int i;
     for(i = 0; i < size; i++)
         term_received_byte(buf[i]);
 }

 void monitor_init(void)
 {
     if (!serial_console) {
         term_printf("QEMU %s monitor - type 'help' for more information\n",
                     QEMU_VERSION);
         term_show_prompt();
     }
     add_fd_read_handler(0, term_can_read, term_read, NULL);
 }
	/*
	* QEMU monitor
	*
	* Copyright (c) 2003-2004 Fabrice Bellard
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/
	#include <stdlib.h>
	#include <stdio.h>
	#include <stdarg.h>
	#include <string.h>
	#include <getopt.h>
	#include <inttypes.h>
	#include <unistd.h>
	#include <sys/mman.h>
	#include <fcntl.h>
	#include <signal.h>
	#include <time.h>
	#include <sys/time.h>
	#include <malloc.h>
	#include <termios.h>
	#include <sys/poll.h>
	#include <errno.h>
	#include <ctype.h>

	#include "cpu.h"
	#include "vl.h"

	//#define DEBUG

	#define TERM_CMD_BUF_SIZE 4095
	#define MAX_ARGS 64

	#define IS_NORM 0
	#define IS_ESC 1
	#define IS_CSI 2

	#define printf do_not_use_printf

	static char term_cmd_buf[TERM_CMD_BUF_SIZE + 1];
	static int term_cmd_buf_index;
	static int term_cmd_buf_size;
	static int term_esc_state;
	static int term_esc_param;

	typedef struct term_cmd_t {
	const char *name;
	void (handler)(int argc, const char *argv);
	const char *params;
	const char *help;
	} term_cmd_t;

	static term_cmd_t term_cmds[];
	static term_cmd_t info_cmds[];

	void term_printf(const char *fmt, ...)
	{
	va_list ap;
	va_start(ap, fmt);
	vprintf(fmt, ap);
	va_end(ap);
	}

	void term_flush(void)
	{
	fflush(stdout);
	}

	static int compare_cmd(const char name, const char list)
	{
	const char p, pstart;
	int len;
	len = strlen(name);
	p = list;
	for(;;) {
	pstart = p;
	p = strchr(p, '\|');
	if (!p)
	p = pstart + strlen(pstart);
	if ((p - pstart) == len && !memcmp(pstart, name, len))
	return 1;
	if (*p == '\0')
	break;
	p++;
	}
	return 0;
	}

	static void help_cmd1(term_cmd_t cmds, const char prefix, const char *name)
	{
	term_cmd_t *cmd;

	for(cmd = cmds; cmd->name != NULL; cmd++) {
	if (!name \|\| !strcmp(name, cmd->name))
	term_printf("%s%s %s -- %s\n", prefix, cmd->name, cmd->params, cmd->help);
	}
	}

	static void help_cmd(const char *name)
	{
	if (name && !strcmp(name, "info")) {
	help_cmd1(info_cmds, "info ", NULL);
	} else {
	help_cmd1(term_cmds, "", name);
	}
	}

	static void do_help(int argc, const char **argv)
	{
	help_cmd(argv[1]);
	}

	static void do_commit(int argc, const char **argv)
	{
	int i;

	for (i = 0; i < MAX_DISKS; i++) {
	if (bs_table[i])
	bdrv_commit(bs_table[i]);
	}
	}

	static void do_info(int argc, const char **argv)
	{
	term_cmd_t *cmd;
	const char *item;

	if (argc < 2)
	goto help;
	item = argv[1];
	for(cmd = info_cmds; cmd->name != NULL; cmd++) {
	if (compare_cmd(argv[1], cmd->name))
	goto found;
	}
	help:
	help_cmd(argv[0]);
	return;
	found:
	cmd->handler(argc, argv);
	}

	static void do_info_network(int argc, const char **argv)
	{
	int i, j;
	NetDriverState *nd;

	for(i = 0; i < nb_nics; i++) {
	nd = &nd_table[i];
	term_printf("%d: ifname=%s macaddr=", i, nd->ifname);
	for(j = 0; j < 6; j++) {
	if (j > 0)
	term_printf(":");
	term_printf("%02x", nd->macaddr[j]);
	}
	term_printf("\n");
	}
	}

	static void do_info_block(int argc, const char **argv)
	{
	bdrv_info();
	}

	static void do_quit(int argc, const char **argv)
	{
	exit(0);
	}

	static int eject_device(BlockDriverState *bs, int force)
	{
	if (bdrv_is_inserted(bs)) {
	if (!force) {
	if (!bdrv_is_removable(bs)) {
	term_printf("device is not removable\n");
	return -1;
	}
	if (bdrv_is_locked(bs)) {
	term_printf("device is locked\n");
	return -1;
	}
	}
	bdrv_close(bs);
	}
	return 0;
	}

	static void do_eject(int argc, const char **argv)
	{
	BlockDriverState *bs;
	const char **parg;
	int force;

	parg = argv + 1;
	if (!*parg) {
	fail:
	help_cmd(argv[0]);
	return;
	}
	force = 0;
	if (!strcmp(*parg, "-f")) {
	force = 1;
	parg++;
	}
	if (!*parg)
	goto fail;
	bs = bdrv_find(*parg);
	if (!bs) {
	term_printf("device not found\n");
	return;
	}
	eject_device(bs, force);
	}

	static void do_change(int argc, const char **argv)
	{
	BlockDriverState *bs;

	if (argc != 3) {
	help_cmd(argv[0]);
	return;
	}
	bs = bdrv_find(argv[1]);
	if (!bs) {
	term_printf("device not found\n");
	return;
	}
	if (eject_device(bs, 0) < 0)
	return;
	bdrv_open(bs, argv[2], 0);
	}

	static void do_screen_dump(int argc, const char **argv)
	{
	if (argc != 2) {
	help_cmd(argv[0]);
	return;
	}
	vga_screen_dump(argv[1]);
	}

	static term_cmd_t term_cmds[] = {
	{ "help\|?", do_help,
	"[cmd]", "show the help" },
	{ "commit", do_commit,
	"", "commit changes to the disk images (if -snapshot is used)" },
	{ "info", do_info,
	"subcommand", "show various information about the system state" },
	{ "q\|quit", do_quit,
	"", "quit the emulator" },
	{ "eject", do_eject,
	"[-f] device", "eject a removable media (use -f to force it)" },
	{ "change", do_change,
	"device filename", "change a removable media" },
	{ "screendump", do_screen_dump,
	"filename", "save screen into PPM image 'filename'" },
	{ NULL, NULL, },
	};

	static term_cmd_t info_cmds[] = {
	{ "network", do_info_network,
	"", "show the network state" },
	{ "block", do_info_block,
	"", "show the block devices" },
	{ NULL, NULL, },
	};

	static void term_handle_command(char *cmdline)
	{
	char p, pstart;
	int argc;
	const char *args[MAX_ARGS + 1];
	term_cmd_t *cmd;

	#ifdef DEBUG
	term_printf("command='%s'\n", cmdline);
	#endif

	/* split command in words */
	argc = 0;
	p = cmdline;
	for(;;) {
	while (isspace(*p))
	p++;
	if (*p == '\0')
	break;
	pstart = p;
	while (p != '\0' && !isspace(p))
	p++;
	args[argc] = pstart;
	argc++;
	if (argc >= MAX_ARGS)
	break;
	if (*p == '\0')
	break;
	*p++ = '\0';
	}
	args[argc] = NULL;
	#ifdef DEBUG
	for(i=0;i<argc;i++) {
	term_printf(" '%s'", args[i]);
	}
	term_printf("\n");
	#endif
	if (argc <= 0)
	return;
	for(cmd = term_cmds; cmd->name != NULL; cmd++) {
	if (compare_cmd(args[0], cmd->name))
	goto found;
	}
	term_printf("unknown command: '%s'\n", args[0]);
	return;
	found:
	cmd->handler(argc, args);
	}

	static void term_show_prompt(void)
	{
	term_printf("(qemu) ");
	fflush(stdout);
	term_cmd_buf_index = 0;
	term_cmd_buf_size = 0;
	term_esc_state = IS_NORM;
	}

	static void term_insert_char(int ch)
	{
	if (term_cmd_buf_index < TERM_CMD_BUF_SIZE) {
	memmove(term_cmd_buf + term_cmd_buf_index + 1,
	term_cmd_buf + term_cmd_buf_index,
	term_cmd_buf_size - term_cmd_buf_index);
	term_cmd_buf[term_cmd_buf_index] = ch;
	term_cmd_buf_size++;
	term_printf("\033[@%c", ch);
	term_cmd_buf_index++;
	term_flush();
	}
	}

	static void term_backward_char(void)
	{
	if (term_cmd_buf_index > 0) {
	term_cmd_buf_index--;
	term_printf("\033[D");
	term_flush();
	}
	}

	static void term_forward_char(void)
	{
	if (term_cmd_buf_index < term_cmd_buf_size) {
	term_cmd_buf_index++;
	term_printf("\033[C");
	term_flush();
	}
	}

	static void term_delete_char(void)
	{
	if (term_cmd_buf_index < term_cmd_buf_size) {
	memmove(term_cmd_buf + term_cmd_buf_index,
	term_cmd_buf + term_cmd_buf_index + 1,
	term_cmd_buf_size - term_cmd_buf_index - 1);
	term_printf("\033[P");
	term_cmd_buf_size--;
	term_flush();
	}
	}

	static void term_backspace(void)
	{
	if (term_cmd_buf_index > 0) {
	term_backward_char();
	term_delete_char();
	}
	}

	static void term_bol(void)
	{
	while (term_cmd_buf_index > 0)
	term_backward_char();
	}

	static void term_eol(void)
	{
	while (term_cmd_buf_index < term_cmd_buf_size)
	term_forward_char();
	}

	/* return true if command handled */
	static void term_handle_byte(int ch)
	{
	switch(term_esc_state) {
	case IS_NORM:
	switch(ch) {
	case 1:
	term_bol();
	break;
	case 5:
	term_eol();
	break;
	case 10:
	case 13:
	term_cmd_buf[term_cmd_buf_size] = '\0';
	term_printf("\n");
	term_handle_command(term_cmd_buf);
	term_show_prompt();
	break;
	case 27:
	term_esc_state = IS_ESC;
	break;
	case 127:
	case 8:
	term_backspace();
	break;
	default:
	if (ch >= 32) {
	term_insert_char(ch);
	}
	break;
	}
	break;
	case IS_ESC:
	if (ch == '[') {
	term_esc_state = IS_CSI;
	term_esc_param = 0;
	} else {
	term_esc_state = IS_NORM;
	}
	break;
	case IS_CSI:
	switch(ch) {
	case 'D':
	term_backward_char();
	break;
	case 'C':
	term_forward_char();
	break;
	case '0' ... '9':
	term_esc_param = term_esc_param * 10 + (ch - '0');
	goto the_end;
	case '~':
	switch(term_esc_param) {
	case 1:
	term_bol();
	break;
	case 3:
	term_delete_char();
	break;
	case 4:
	term_eol();
	break;
	}
	break;
	default:
	break;
	}
	term_esc_state = IS_NORM;
	the_end:
	break;
	}
	}

	/*************************************************************/
	/* serial console support */

	#define TERM_ESCAPE 0x01 /* ctrl-a is used for escape */

	static int term_got_escape, term_command;

	void term_print_help(void)
	{
	term_printf("\n"
	"C-a h print this help\n"
	"C-a x exit emulatior\n"
	"C-a d switch on/off debug log\n"
	"C-a s save disk data back to file (if -snapshot)\n"
	"C-a b send break (magic sysrq)\n"
	"C-a c switch between console and monitor\n"
	"C-a C-a send C-a\n"
	);
	}

	/* called when a char is received */
	static void term_received_byte(int ch)
	{
	if (!serial_console) {
	/* if no serial console, handle every command */
	term_handle_byte(ch);
	} else {
	if (term_got_escape) {
	term_got_escape = 0;
	switch(ch) {
	case 'h':
	term_print_help();
	break;
	case 'x':
	exit(0);
	break;
	case 's':
	{
	int i;
	for (i = 0; i < MAX_DISKS; i++) {
	if (bs_table[i])
	bdrv_commit(bs_table[i]);
	}
	}
	break;
	case 'b':
	if (serial_console)
	serial_receive_break(serial_console);
	break;
	case 'c':
	if (!term_command) {
	term_show_prompt();
	term_command = 1;
	} else {
	term_command = 0;
	}
	break;
	case 'd':
	cpu_set_log(CPU_LOG_ALL);
	break;
	case TERM_ESCAPE:
	goto send_char;
	}
	} else if (ch == TERM_ESCAPE) {
	term_got_escape = 1;
	} else {
	send_char:
	if (term_command) {
	term_handle_byte(ch);
	} else {
	if (serial_console)
	serial_receive_byte(serial_console, ch);
	}
	}
	}
	}

	static int term_can_read(void *opaque)
	{
	if (serial_console) {
	return serial_can_receive(serial_console);
	} else {
	return 1;
	}
	}

	static void term_read(void opaque, const uint8_t buf, int size)
	{
	int i;
	for(i = 0; i < size; i++)
	term_received_byte(buf[i]);
	}

	void monitor_init(void)
	{
	if (!serial_console) {
	term_printf("QEMU %s monitor - type 'help' for more information\n",
	QEMU_VERSION);
	term_show_prompt();
	}
	add_fd_read_handler(0, term_can_read, term_read, NULL);
	}