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/*
* Copyright (C) 2005 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup genericconsole
* @{
*/
/**
* @file kconsole.c
* @brief Kernel console.
*
* This file contains kernel thread managing the kernel console.
*/
#include <console/kconsole.h>
#include <console/console.h>
#include <console/chardev.h>
#include <console/cmd.h>
#include <print.h>
#include <panic.h>
#include <typedefs.h>
#include <arch/types.h>
#include <adt/list.h>
#include <arch.h>
#include <macros.h>
#include <debug.h>
#include <func.h>
#include <symtab.h>
#include <macros.h>
/** Simple kernel console.
*
* The console is realized by kernel thread kconsole.
* It doesn't understand any useful command on its own,
* but makes it possible for other kernel subsystems to
* register their own commands.
*/
/** Locking.
*
* There is a list of cmd_info_t structures. This list
* is protected by cmd_lock spinlock. Note that specially
* the link elements of cmd_info_t are protected by
* this lock.
*
* Each cmd_info_t also has its own lock, which protects
* all elements thereof except the link element.
*
* cmd_lock must be acquired before any cmd_info lock.
* When locking two cmd info structures, structure with
* lower address must be locked first.
*/
SPINLOCK_INITIALIZE(cmd_lock); /**< Lock protecting command list. */
LIST_INITIALIZE(cmd_head); /**< Command list. */
static cmd_info_t *parse_cmdline(char *cmdline, size_t len);
static bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end);
static char history[KCONSOLE_HISTORY][MAX_CMDLINE] = {};
/** Initialize kconsole data structures. */
void kconsole_init(void)
{
int i;
cmd_init();
for (i=0; i<KCONSOLE_HISTORY; i++)
history[i][0] = '\0';
}
/** Register kconsole command.
*
* @param cmd Structure describing the command.
*
* @return 0 on failure, 1 on success.
*/
int cmd_register(cmd_info_t *cmd)
{
link_t *cur;
spinlock_lock(&cmd_lock);
/*
* Make sure the command is not already listed.
*/
for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
cmd_info_t *hlp;
hlp = list_get_instance(cur, cmd_info_t, link);
if (hlp == cmd) {
/* The command is already there. */
spinlock_unlock(&cmd_lock);
return 0;
}
/* Avoid deadlock. */
if (hlp < cmd) {
spinlock_lock(&hlp->lock);
spinlock_lock(&cmd->lock);
} else {
spinlock_lock(&cmd->lock);
spinlock_lock(&hlp->lock);
}
if ((strncmp(hlp->name,
cmd->name, max(strlen(cmd->name),
strlen(hlp->name))) == 0)) {
/* The command is already there. */
spinlock_unlock(&hlp->lock);
spinlock_unlock(&cmd->lock);
spinlock_unlock(&cmd_lock);
return 0;
}
spinlock_unlock(&hlp->lock);
spinlock_unlock(&cmd->lock);
}
/*
* Now the command can be added.
*/
list_append(&cmd->link, &cmd_head);
spinlock_unlock(&cmd_lock);
return 1;
}
/** Print count times a character */
static void rdln_print_c(char ch, int count)
{
int i;
for (i=0;i<count;i++)
putchar(ch);
}
/** Insert character to string */
static void insert_char(char *str, char ch, int pos)
{
int i;
for (i=strlen(str);i > pos; i--)
str[i] = str[i-1];
str[pos] = ch;
}
/** Try to find a command beginning with prefix */
static const char * cmdtab_search_one(const char *name,link_t **startpos)
{
int namelen = strlen(name);
const char *curname;
spinlock_lock(&cmd_lock);
if (!*startpos)
*startpos = cmd_head.next;
for (;*startpos != &cmd_head;*startpos = (*startpos)->next) {
cmd_info_t *hlp;
hlp = list_get_instance(*startpos, cmd_info_t, link);
curname = hlp->name;
if (strlen(curname) < namelen)
continue;
if (strncmp(curname, name, namelen) == 0) {
spinlock_unlock(&cmd_lock);
return curname+namelen;
}
}
spinlock_unlock(&cmd_lock);
return NULL;
}
/** Command completion of the commands
*
* @param name - string to match, changed to hint on exit
* @return number of found matches
*/
static int cmdtab_compl(char *name)
{
char output[MAX_SYMBOL_NAME+1];
link_t *startpos = NULL;
const char *foundtxt;
int found = 0;
int i;
output[0] = '\0';
while ((foundtxt = cmdtab_search_one(name, &startpos))) {
startpos = startpos->next;
if (!found)
strncpy(output, foundtxt, strlen(foundtxt)+1);
else {
for (i=0; output[i] && foundtxt[i] && output[i]==foundtxt[i]; i++)
;
output[i] = '\0';
}
found++;
}
if (!found)
return 0;
if (found > 1 && !strlen(output)) {
printf("\n");
startpos = NULL;
while ((foundtxt = cmdtab_search_one(name, &startpos))) {
cmd_info_t *hlp;
hlp = list_get_instance(startpos, cmd_info_t, link);
printf("%s - %s\n", hlp->name, hlp->description);
startpos = startpos->next;
}
}
strncpy(name, output, MAX_SYMBOL_NAME);
return found;
}
static char * clever_readline(const char *prompt, chardev_t *input)
{
static int histposition = 0;
char tmp[MAX_CMDLINE+1];
int curlen = 0, position = 0;
char *current = history[histposition];
int i;
char mod; /* Command Modifier */
char c;
printf("%s> ", prompt);
while (1) {
c = _getc(input);
if (c == '\n') {
putchar(c);
break;
} if (c == '\b') { /* Backspace */
if (position == 0)
continue;
for (i=position; i<curlen;i++)
current[i-1] = current[i];
curlen--;
position--;
putchar('\b');
for (i=position;i<curlen;i++)
putchar(current[i]);
putchar(' ');
rdln_print_c('\b',curlen-position+1);
continue;
}
if (c == '\t') { /* Tabulator */
int found;
/* Move to the end of the word */
for (;position<curlen && current[position]!=' ';position++)
putchar(current[position]);
/* Copy to tmp last word */
for (i=position-1;i >= 0 && current[i]!=' ' ;i--)
;
/* If word begins with * or &, skip it */
if (tmp[0] == '*' || tmp[0] == '&')
for (i=1;tmp[i];i++)
tmp[i-1] = tmp[i];
i++; /* I is at the start of the word */
strncpy(tmp, current+i, position-i+1);
if (i==0) { /* Command completion */
found = cmdtab_compl(tmp);
} else { /* Symtab completion */
found = symtab_compl(tmp);
}
if (found == 0)
continue;
for (i=0;tmp[i] && curlen < MAX_CMDLINE;i++,curlen++)
insert_char(current, tmp[i], i+position);
if (strlen(tmp) || found==1) { /* If we have a hint */
for (i=position;i<curlen;i++)
putchar(current[i]);
position += strlen(tmp);
/* Add space to end */
if (found == 1 && position == curlen && \
curlen < MAX_CMDLINE) {
current[position] = ' ';
curlen++;
position++;
putchar(' ');
}
} else { /* No hint, table was printed */
printf("%s> ", prompt);
for (i=0; i<curlen;i++)
putchar(current[i]);
position += strlen(tmp);
}
rdln_print_c('\b', curlen-position);
continue;
}
if (c == 0x1b) { /* Special command */
mod = _getc(input);
c = _getc(input);
if (mod != 0x5b && mod != 0x4f)
continue;
if (c == 0x33 && _getc(input) == 0x7e) {
/* Delete */
if (position == curlen)
continue;
for (i=position+1; i<curlen;i++) {
putchar(current[i]);
current[i-1] = current[i];
}
putchar(' ');
rdln_print_c('\b',curlen-position);
curlen--;
}
else if (c == 0x48) { /* Home */
rdln_print_c('\b',position);
position = 0;
}
else if (c == 0x46) { /* End */
for (i=position;i<curlen;i++)
putchar(current[i]);
position = curlen;
}
else if (c == 0x44) { /* Left */
if (position > 0) {
putchar('\b');
position--;
}
continue;
}
else if (c == 0x43) { /* Right */
if (position < curlen) {
putchar(current[position]);
position++;
}
continue;
}
else if (c == 0x41 || c == 0x42) {
/* Up,down */
rdln_print_c('\b',position);
rdln_print_c(' ',curlen);
rdln_print_c('\b',curlen);
if (c == 0x41) /* Up */
histposition--;
else
histposition++;
if (histposition < 0)
histposition = KCONSOLE_HISTORY -1 ;
else
histposition = histposition % KCONSOLE_HISTORY;
current = history[histposition];
printf("%s", current);
curlen = strlen(current);
position = curlen;
continue;
}
continue;
}
if (curlen >= MAX_CMDLINE)
continue;
insert_char(current, c, position);
curlen++;
for (i=position;i<curlen;i++)
putchar(current[i]);
position++;
rdln_print_c('\b',curlen-position);
}
if (curlen) {
histposition++;
histposition = histposition % KCONSOLE_HISTORY;
}
current[curlen] = '\0';
return current;
}
/** Kernel console managing thread.
*
* @param prompt Kernel console prompt (e.g kconsole/panic).
*/
void kconsole(void *prompt)
{
cmd_info_t *cmd_info;
count_t len;
char *cmdline;
if (!stdin) {
printf("%s: no stdin\n", __FUNCTION__);
return;
}
while (true) {
cmdline = clever_readline(prompt, stdin);
len = strlen(cmdline);
if (!len)
continue;
cmd_info = parse_cmdline(cmdline, len);
if (!cmd_info)
continue;
if (strncmp(cmd_info->name,"exit", \
min(strlen(cmd_info->name),5)) == 0)
break;
(void) cmd_info->func(cmd_info->argv);
}
}
static int parse_int_arg(char *text, size_t len, __native *result)
{
char symname[MAX_SYMBOL_NAME];
__address symaddr;
bool isaddr = false;
bool isptr = false;
/* If we get a name, try to find it in symbol table */
if (text[0] == '&') {
isaddr = true;
text++;len--;
} else if (text[0] == '*') {
isptr = true;
text++;len--;
}
if (text[0] < '0' || text[0] > '9') {
strncpy(symname, text, min(len+1, MAX_SYMBOL_NAME));
symaddr = get_symbol_addr(symname);
if (!symaddr) {
printf("Symbol %s not found.\n",symname);
return -1;
}
if (symaddr == (__address) -1) {
printf("Duplicate symbol %s.\n",symname);
symtab_print_search(symname);
return -1;
}
if (isaddr)
*result = (__native)symaddr;
else if (isptr)
*result = **((__native **)symaddr);
else
*result = *((__native *)symaddr);
} else { /* It's a number - convert it */
*result = atoi(text);
if (isptr)
*result = *((__native *)*result);
}
return 0;
}
/** Parse command line.
*
* @param cmdline Command line as read from input device.
* @param len Command line length.
*
* @return Structure describing the command.
*/
cmd_info_t *parse_cmdline(char *cmdline, size_t len)
{
index_t start = 0, end = 0;
cmd_info_t *cmd = NULL;
link_t *cur;
int i;
int error = 0;
if (!parse_argument(cmdline, len, &start, &end)) {
/* Command line did not contain alphanumeric word. */
return NULL;
}
spinlock_lock(&cmd_lock);
for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
cmd_info_t *hlp;
hlp = list_get_instance(cur, cmd_info_t, link);
spinlock_lock(&hlp->lock);
if (strncmp(hlp->name, &cmdline[start], max(strlen(hlp->name),
end-start+1)) == 0) {
cmd = hlp;
break;
}
spinlock_unlock(&hlp->lock);
}
spinlock_unlock(&cmd_lock);
if (!cmd) {
/* Unknown command. */
printf("Unknown command.\n");
return NULL;
}
/* cmd == hlp is locked */
/*
* The command line must be further analyzed and
* the parameters therefrom must be matched and
* converted to those specified in the cmd info
* structure.
*/
for (i = 0; i < cmd->argc; i++) {
char *buf;
start = end + 1;
if (!parse_argument(cmdline, len, &start, &end)) {
printf("Too few arguments.\n");
spinlock_unlock(&cmd->lock);
return NULL;
}
error = 0;
switch (cmd->argv[i].type) {
case ARG_TYPE_STRING:
buf = cmd->argv[i].buffer;
strncpy(buf, (const char *) &cmdline[start], min((end - start) + 2, cmd->argv[i].len));
buf[min((end - start) + 1, cmd->argv[i].len - 1)] = '\0';
break;
case ARG_TYPE_INT:
if (parse_int_arg(cmdline+start, end-start+1,
&cmd->argv[i].intval))
error = 1;
break;
case ARG_TYPE_VAR:
if (start != end && cmdline[start] == '"' && cmdline[end] == '"') {
buf = cmd->argv[i].buffer;
strncpy(buf, (const char *) &cmdline[start+1],
min((end-start), cmd->argv[i].len));
buf[min((end - start), cmd->argv[i].len - 1)] = '\0';
cmd->argv[i].intval = (__native) buf;
cmd->argv[i].vartype = ARG_TYPE_STRING;
} else if (!parse_int_arg(cmdline+start, end-start+1,
&cmd->argv[i].intval))
cmd->argv[i].vartype = ARG_TYPE_INT;
else {
printf("Unrecognized variable argument.\n");
error = 1;
}
break;
case ARG_TYPE_INVALID:
default:
printf("invalid argument type\n");
error = 1;
break;
}
}
if (error) {
spinlock_unlock(&cmd->lock);
return NULL;
}
start = end + 1;
if (parse_argument(cmdline, len, &start, &end)) {
printf("Too many arguments.\n");
spinlock_unlock(&cmd->lock);
return NULL;
}
spinlock_unlock(&cmd->lock);
return cmd;
}
/** Parse argument.
*
* Find start and end positions of command line argument.
*
* @param cmdline Command line as read from the input device.
* @param len Number of characters in cmdline.
* @param start On entry, 'start' contains pointer to the index
* of first unprocessed character of cmdline.
* On successful exit, it marks beginning of the next argument.
* @param end Undefined on entry. On exit, 'end' points to the last character
* of the next argument.
*
* @return false on failure, true on success.
*/
bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end)
{
int i;
bool found_start = false;
ASSERT(start != NULL);
ASSERT(end != NULL);
for (i = *start; i < len; i++) {
if (!found_start) {
if (is_white(cmdline[i]))
(*start)++;
else
found_start = true;
} else {
if (is_white(cmdline[i]))
break;
}
}
*end = i - 1;
return found_start;
}
/** @}
*/