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  1. /*
  2.  * Copyright (c) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup genericconsole
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file    kconsole.c
  35.  * @brief   Kernel console.
  36.  *
  37.  * This file contains kernel thread managing the kernel console.
  38.  */
  39.  
  40. #include <console/kconsole.h>
  41. #include <console/console.h>
  42. #include <console/chardev.h>
  43. #include <console/cmd.h>
  44. #include <print.h>
  45. #include <panic.h>
  46. #include <arch/types.h>
  47. #include <adt/list.h>
  48. #include <arch.h>
  49. #include <macros.h>
  50. #include <debug.h>
  51. #include <func.h>
  52. #include <string.h>
  53. #include <macros.h>
  54. #include <sysinfo/sysinfo.h>
  55. #include <ddi/device.h>
  56. #include <symtab.h>
  57. #include <errno.h>
  58.  
  59. /** Simple kernel console.
  60.  *
  61.  * The console is realized by kernel thread kconsole.
  62.  * It doesn't understand any useful command on its own,
  63.  * but makes it possible for other kernel subsystems to
  64.  * register their own commands.
  65.  */
  66.  
  67. /** Locking.
  68.  *
  69.  * There is a list of cmd_info_t structures. This list
  70.  * is protected by cmd_lock spinlock. Note that specially
  71.  * the link elements of cmd_info_t are protected by
  72.  * this lock.
  73.  *
  74.  * Each cmd_info_t also has its own lock, which protects
  75.  * all elements thereof except the link element.
  76.  *
  77.  * cmd_lock must be acquired before any cmd_info lock.
  78.  * When locking two cmd info structures, structure with
  79.  * lower address must be locked first.
  80.  */
  81.  
  82. SPINLOCK_INITIALIZE(cmd_lock);  /**< Lock protecting command list. */
  83. LIST_INITIALIZE(cmd_head);  /**< Command list. */
  84.  
  85. static cmd_info_t *parse_cmdline(char *cmdline, size_t len);
  86. static bool parse_argument(char *cmdline, size_t len, index_t *start,
  87.     index_t *end);
  88. static char history[KCONSOLE_HISTORY][MAX_CMDLINE] = {};
  89.  
  90. /** Initialize kconsole data structures
  91.  *
  92.  * This is the most basic initialization, almost no
  93.  * other kernel subsystem is ready yet.
  94.  *
  95.  */
  96. void kconsole_init(void)
  97. {
  98.     unsigned int i;
  99.  
  100.     cmd_init();
  101.     for (i = 0; i < KCONSOLE_HISTORY; i++)
  102.         history[i][0] = '\0';
  103. }
  104.  
  105. /** Register kconsole command.
  106.  *
  107.  * @param cmd Structure describing the command.
  108.  *
  109.  * @return 0 on failure, 1 on success.
  110.  */
  111. int cmd_register(cmd_info_t *cmd)
  112. {
  113.     link_t *cur;
  114.    
  115.     spinlock_lock(&cmd_lock);
  116.    
  117.     /*
  118.      * Make sure the command is not already listed.
  119.      */
  120.     for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
  121.         cmd_info_t *hlp;
  122.        
  123.         hlp = list_get_instance(cur, cmd_info_t, link);
  124.  
  125.         if (hlp == cmd) {
  126.             /* The command is already there. */
  127.             spinlock_unlock(&cmd_lock);
  128.             return 0;
  129.         }
  130.  
  131.         /* Avoid deadlock. */
  132.         if (hlp < cmd) {
  133.             spinlock_lock(&hlp->lock);
  134.             spinlock_lock(&cmd->lock);
  135.         } else {
  136.             spinlock_lock(&cmd->lock);
  137.             spinlock_lock(&hlp->lock);
  138.         }
  139.         if ((strncmp(hlp->name, cmd->name, max(strlen(cmd->name),
  140.             strlen(hlp->name))) == 0)) {
  141.             /* The command is already there. */
  142.             spinlock_unlock(&hlp->lock);
  143.             spinlock_unlock(&cmd->lock);
  144.             spinlock_unlock(&cmd_lock);
  145.             return 0;
  146.         }
  147.        
  148.         spinlock_unlock(&hlp->lock);
  149.         spinlock_unlock(&cmd->lock);
  150.     }
  151.    
  152.     /*
  153.      * Now the command can be added.
  154.      */
  155.     list_append(&cmd->link, &cmd_head);
  156.    
  157.     spinlock_unlock(&cmd_lock);
  158.     return 1;
  159. }
  160.  
  161. /** Print count times a character */
  162. static void rdln_print_c(char ch, int count)
  163. {
  164.     int i;
  165.     for (i = 0; i < count; i++)
  166.         putchar(ch);
  167. }
  168.  
  169. /** Insert character to string */
  170. static void insert_char(char *str, char ch, int pos)
  171. {
  172.     int i;
  173.    
  174.     for (i = strlen(str); i > pos; i--)
  175.         str[i] = str[i - 1];
  176.     str[pos] = ch;
  177. }
  178.  
  179. /** Try to find a command beginning with prefix */
  180. static const char *cmdtab_search_one(const char *name,link_t **startpos)
  181. {
  182.     size_t namelen = strlen(name);
  183.     const char *curname;
  184.  
  185.     spinlock_lock(&cmd_lock);
  186.  
  187.     if (!*startpos)
  188.         *startpos = cmd_head.next;
  189.  
  190.     for (; *startpos != &cmd_head; *startpos = (*startpos)->next) {
  191.         cmd_info_t *hlp;
  192.         hlp = list_get_instance(*startpos, cmd_info_t, link);
  193.  
  194.         curname = hlp->name;
  195.         if (strlen(curname) < namelen)
  196.             continue;
  197.         if (strncmp(curname, name, namelen) == 0) {
  198.             spinlock_unlock(&cmd_lock);
  199.             return curname+namelen;
  200.         }
  201.     }
  202.     spinlock_unlock(&cmd_lock);
  203.     return NULL;
  204. }
  205.  
  206.  
  207. /** Command completion of the commands
  208.  *
  209.  * @param name - string to match, changed to hint on exit
  210.  * @return number of found matches
  211.  */
  212. static int cmdtab_compl(char *name)
  213. {
  214.     static char output[/*MAX_SYMBOL_NAME*/128 + 1];
  215.     link_t *startpos = NULL;
  216.     const char *foundtxt;
  217.     int found = 0;
  218.     int i;
  219.  
  220.     output[0] = '\0';
  221.     while ((foundtxt = cmdtab_search_one(name, &startpos))) {
  222.         startpos = startpos->next;
  223.         if (!found)
  224.             strncpy(output, foundtxt, strlen(foundtxt) + 1);
  225.         else {
  226.             for (i = 0; output[i] && foundtxt[i] &&
  227.                 output[i] == foundtxt[i]; i++)
  228.                 ;
  229.             output[i] = '\0';
  230.         }
  231.         found++;
  232.     }
  233.     if (!found)
  234.         return 0;
  235.  
  236.     if (found > 1 && !strlen(output)) {
  237.         printf("\n");
  238.         startpos = NULL;
  239.         while ((foundtxt = cmdtab_search_one(name, &startpos))) {
  240.             cmd_info_t *hlp;
  241.             hlp = list_get_instance(startpos, cmd_info_t, link);
  242.             printf("%s - %s\n", hlp->name, hlp->description);
  243.             startpos = startpos->next;
  244.         }
  245.     }
  246.     strncpy(name, output, 128/*MAX_SYMBOL_NAME*/);
  247.     return found;
  248. }
  249.  
  250. static char *clever_readline(const char *prompt, indev_t *input)
  251. {
  252.     static int histposition = 0;
  253.  
  254.     static char tmp[MAX_CMDLINE + 1];
  255.     int curlen = 0, position = 0;
  256.     char *current = history[histposition];
  257.     int i;
  258.     char mod; /* Command Modifier */
  259.     char c;
  260.  
  261.     printf("%s> ", prompt);
  262.     while (1) {
  263.         c = _getc(input);
  264.         if (c == '\n') {
  265.             putchar(c);
  266.             break;
  267.         }
  268.         if (c == '\b') { /* Backspace */
  269.             if (position == 0)
  270.                 continue;
  271.             for (i = position; i < curlen; i++)
  272.                 current[i - 1] = current[i];
  273.             curlen--;
  274.             position--;
  275.             putchar('\b');
  276.             for (i = position; i < curlen; i++)
  277.                 putchar(current[i]);
  278.             putchar(' ');
  279.             rdln_print_c('\b', curlen - position + 1);
  280.             continue;
  281.         }
  282.         if (c == '\t') { /* Tabulator */
  283.             int found;
  284.  
  285.             /* Move to the end of the word */
  286.             for (; position < curlen && current[position] != ' ';
  287.                 position++)
  288.                 putchar(current[position]);
  289.             /* Copy to tmp last word */
  290.             for (i = position - 1; i >= 0 && current[i] != ' '; i--)
  291.                 ;
  292.             /* If word begins with * or &, skip it */
  293.             if (tmp[0] == '*' || tmp[0] == '&')
  294.                 for (i = 1; tmp[i]; i++)
  295.                     tmp[i - 1] = tmp[i];
  296.             i++; /* I is at the start of the word */
  297.             strncpy(tmp, current + i, position - i + 1);
  298.  
  299.             if (i == 0) { /* Command completion */
  300.                 found = cmdtab_compl(tmp);
  301.             } else { /* Symtab completion */
  302.                 found = symtab_compl(tmp);
  303.             }
  304.  
  305.             if (found == 0)
  306.                 continue;
  307.             for (i = 0; tmp[i] && curlen < MAX_CMDLINE;
  308.                 i++, curlen++)
  309.                 insert_char(current, tmp[i], i + position);
  310.  
  311.             if (strlen(tmp) || found == 1) { /* If we have a hint */
  312.                 for (i = position; i < curlen; i++)
  313.                     putchar(current[i]);
  314.                 position += strlen(tmp);
  315.                 /* Add space to end */
  316.                 if (found == 1 && position == curlen &&
  317.                     curlen < MAX_CMDLINE) {
  318.                     current[position] = ' ';
  319.                     curlen++;
  320.                     position++;
  321.                     putchar(' ');
  322.                 }
  323.             } else { /* No hint, table was printed */
  324.                 printf("%s> ", prompt);
  325.                 for (i = 0; i < curlen; i++)
  326.                     putchar(current[i]);
  327.                 position += strlen(tmp);
  328.             }
  329.             rdln_print_c('\b', curlen - position);
  330.             continue;
  331.         }
  332.         if (c == 0x1b) { /* Special command */
  333.             mod = _getc(input);
  334.             c = _getc(input);
  335.  
  336.             if (mod != 0x5b && mod != 0x4f)
  337.                 continue;
  338.  
  339.             if (c == 0x33 && _getc(input) == 0x7e) {
  340.                 /* Delete */
  341.                 if (position == curlen)
  342.                     continue;
  343.                 for (i = position + 1; i < curlen; i++) {
  344.                     putchar(current[i]);
  345.                     current[i - 1] = current[i];
  346.                 }
  347.                 putchar(' ');
  348.                 rdln_print_c('\b', curlen - position);
  349.                 curlen--;
  350.             } else if (c == 0x48) { /* Home */
  351.                 rdln_print_c('\b', position);
  352.                 position = 0;
  353.             } else if (c == 0x46) {  /* End */
  354.                 for (i = position; i < curlen; i++)
  355.                     putchar(current[i]);
  356.                 position = curlen;
  357.             } else if (c == 0x44) { /* Left */
  358.                 if (position > 0) {
  359.                     putchar('\b');
  360.                     position--;
  361.                 }
  362.                 continue;
  363.             } else if (c == 0x43) { /* Right */
  364.                 if (position < curlen) {
  365.                     putchar(current[position]);
  366.                     position++;
  367.                 }
  368.                 continue;
  369.             } else if (c == 0x41 || c == 0x42) {
  370.                                 /* Up, down */
  371.                 rdln_print_c('\b', position);
  372.                 rdln_print_c(' ', curlen);
  373.                 rdln_print_c('\b', curlen);
  374.                 if (c == 0x41) /* Up */
  375.                     histposition--;
  376.                 else
  377.                     histposition++;
  378.                 if (histposition < 0) {
  379.                     histposition = KCONSOLE_HISTORY - 1;
  380.                 } else {
  381.                     histposition =
  382.                         histposition % KCONSOLE_HISTORY;
  383.                 }
  384.                 current = history[histposition];
  385.                 printf("%s", current);
  386.                 curlen = strlen(current);
  387.                 position = curlen;
  388.                 continue;
  389.             }
  390.             continue;
  391.         }
  392.         if (curlen >= MAX_CMDLINE)
  393.             continue;
  394.  
  395.         insert_char(current, c, position);
  396.  
  397.         curlen++;
  398.         for (i = position; i < curlen; i++)
  399.             putchar(current[i]);
  400.         position++;
  401.         rdln_print_c('\b',curlen - position);
  402.     }
  403.     if (curlen) {
  404.         histposition++;
  405.         histposition = histposition % KCONSOLE_HISTORY;
  406.     }
  407.     current[curlen] = '\0';
  408.     return current;
  409. }
  410.  
  411. bool kconsole_check_poll(void)
  412. {
  413.     return check_poll(stdin);
  414. }
  415.  
  416. /** Kernel console prompt.
  417.  *
  418.  * @param prompt Kernel console prompt (e.g kconsole/panic).
  419.  * @param msg    Message to display in the beginning.
  420.  * @param kcon   Wait for keypress to show the prompt
  421.  *               and never exit.
  422.  *
  423.  */
  424. void kconsole(char *prompt, char *msg, bool kcon)
  425. {
  426.     cmd_info_t *cmd_info;
  427.     count_t len;
  428.     char *cmdline;
  429.    
  430.     if (!stdin) {
  431.         LOG("No stdin for kernel console");
  432.         return;
  433.     }
  434.    
  435.     if (msg)
  436.         printf("%s", msg);
  437.    
  438.     if (kcon)
  439.         _getc(stdin);
  440.     else
  441.         printf("Type \"exit\" to leave the console.\n");
  442.    
  443.     while (true) {
  444.         cmdline = clever_readline((char *) prompt, stdin);
  445.         len = strlen(cmdline);
  446.         if (!len)
  447.             continue;
  448.        
  449.         if ((!kcon) && (len == 4) && (strncmp(cmdline, "exit", 4) == 0))
  450.             break;
  451.        
  452.         cmd_info = parse_cmdline(cmdline, len);
  453.         if (!cmd_info)
  454.             continue;
  455.        
  456.         (void) cmd_info->func(cmd_info->argv);
  457.     }
  458. }
  459.  
  460. /** Kernel console managing thread.
  461.  *
  462.  */
  463. void kconsole_thread(void *data)
  464. {
  465.     kconsole("kconsole", "Kernel console ready (press any key to activate)\n", true);
  466. }
  467.  
  468. static int parse_int_arg(char *text, size_t len, unative_t *result)
  469. {
  470.     uintptr_t symaddr;
  471.     bool isaddr = false;
  472.     bool isptr = false;
  473.     int rc;
  474.  
  475.     static char symname[MAX_SYMBOL_NAME];
  476.    
  477.     /* If we get a name, try to find it in symbol table */
  478.     if (text[0] == '&') {
  479.         isaddr = true;
  480.         text++;
  481.         len--;
  482.     } else if (text[0] == '*') {
  483.         isptr = true;
  484.         text++;
  485.         len--;
  486.     }
  487.     if (text[0] < '0' || text[0] > '9') {
  488.         strncpy(symname, text, min(len + 1, MAX_SYMBOL_NAME));
  489.         rc = symtab_addr_lookup(symname, &symaddr);
  490.         switch (rc) {
  491.         case ENOENT:
  492.             printf("Symbol %s not found.\n", symname);
  493.             return -1;
  494.         case EOVERFLOW:
  495.             printf("Duplicate symbol %s.\n", symname);
  496.             symtab_print_search(symname);
  497.             return -1;
  498.         default:
  499.             printf("No symbol information available.\n");
  500.             return -1;
  501.         }
  502.  
  503.         if (isaddr)
  504.             *result = (unative_t)symaddr;
  505.         else if (isptr)
  506.             *result = **((unative_t **)symaddr);
  507.         else
  508.             *result = *((unative_t *)symaddr);
  509.     } else { /* It's a number - convert it */
  510.         *result = atoi(text);
  511.         if (isptr)
  512.             *result = *((unative_t *)*result);
  513.     }
  514.  
  515.     return 0;
  516. }
  517.  
  518. /** Parse command line.
  519.  *
  520.  * @param cmdline Command line as read from input device.
  521.  * @param len Command line length.
  522.  *
  523.  * @return Structure describing the command.
  524.  */
  525. cmd_info_t *parse_cmdline(char *cmdline, size_t len)
  526. {
  527.     index_t start = 0, end = 0;
  528.     cmd_info_t *cmd = NULL;
  529.     link_t *cur;
  530.     count_t i;
  531.     int error = 0;
  532.    
  533.     if (!parse_argument(cmdline, len, &start, &end)) {
  534.         /* Command line did not contain alphanumeric word. */
  535.         return NULL;
  536.     }
  537.  
  538.     spinlock_lock(&cmd_lock);
  539.    
  540.     for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
  541.         cmd_info_t *hlp;
  542.        
  543.         hlp = list_get_instance(cur, cmd_info_t, link);
  544.         spinlock_lock(&hlp->lock);
  545.        
  546.         if (strncmp(hlp->name, &cmdline[start], max(strlen(hlp->name),
  547.             end - start + 1)) == 0) {
  548.             cmd = hlp;
  549.             break;
  550.         }
  551.        
  552.         spinlock_unlock(&hlp->lock);
  553.     }
  554.    
  555.     spinlock_unlock(&cmd_lock);
  556.    
  557.     if (!cmd) {
  558.         /* Unknown command. */
  559.         printf("Unknown command.\n");
  560.         return NULL;
  561.     }
  562.  
  563.     /* cmd == hlp is locked */
  564.    
  565.     /*
  566.      * The command line must be further analyzed and
  567.      * the parameters therefrom must be matched and
  568.      * converted to those specified in the cmd info
  569.      * structure.
  570.      */
  571.  
  572.     for (i = 0; i < cmd->argc; i++) {
  573.         char *buf;
  574.         start = end + 1;
  575.         if (!parse_argument(cmdline, len, &start, &end)) {
  576.             printf("Too few arguments.\n");
  577.             spinlock_unlock(&cmd->lock);
  578.             return NULL;
  579.         }
  580.        
  581.         error = 0;
  582.         switch (cmd->argv[i].type) {
  583.         case ARG_TYPE_STRING:
  584.             buf = (char *) cmd->argv[i].buffer;
  585.             strncpy(buf, (const char *) &cmdline[start],
  586.                 min((end - start) + 2, cmd->argv[i].len));
  587.             buf[min((end - start) + 1, cmd->argv[i].len - 1)] =
  588.                 '\0';
  589.             break;
  590.         case ARG_TYPE_INT:
  591.             if (parse_int_arg(cmdline + start, end - start + 1,
  592.                 &cmd->argv[i].intval))
  593.                 error = 1;
  594.             break;
  595.         case ARG_TYPE_VAR:
  596.             if (start != end && cmdline[start] == '"' &&
  597.                 cmdline[end] == '"') {
  598.                 buf = (char *) cmd->argv[i].buffer;
  599.                 strncpy(buf, (const char *) &cmdline[start + 1],
  600.                     min((end-start), cmd->argv[i].len));
  601.                 buf[min((end - start), cmd->argv[i].len - 1)] =
  602.                     '\0';
  603.                 cmd->argv[i].intval = (unative_t) buf;
  604.                 cmd->argv[i].vartype = ARG_TYPE_STRING;
  605.             } else if (!parse_int_arg(cmdline + start,
  606.                 end - start + 1, &cmd->argv[i].intval)) {
  607.                 cmd->argv[i].vartype = ARG_TYPE_INT;
  608.             } else {
  609.                 printf("Unrecognized variable argument.\n");
  610.                 error = 1;
  611.             }
  612.             break;
  613.         case ARG_TYPE_INVALID:
  614.         default:
  615.             printf("invalid argument type\n");
  616.             error = 1;
  617.             break;
  618.         }
  619.     }
  620.    
  621.     if (error) {
  622.         spinlock_unlock(&cmd->lock);
  623.         return NULL;
  624.     }
  625.    
  626.     start = end + 1;
  627.     if (parse_argument(cmdline, len, &start, &end)) {
  628.         printf("Too many arguments.\n");
  629.         spinlock_unlock(&cmd->lock);
  630.         return NULL;
  631.     }
  632.    
  633.     spinlock_unlock(&cmd->lock);
  634.     return cmd;
  635. }
  636.  
  637. /** Parse argument.
  638.  *
  639.  * Find start and end positions of command line argument.
  640.  *
  641.  * @param cmdline Command line as read from the input device.
  642.  * @param len Number of characters in cmdline.
  643.  * @param start On entry, 'start' contains pointer to the index
  644.  *        of first unprocessed character of cmdline.
  645.  *        On successful exit, it marks beginning of the next argument.
  646.  * @param end Undefined on entry. On exit, 'end' points to the last character
  647.  *        of the next argument.
  648.  *
  649.  * @return false on failure, true on success.
  650.  */
  651. bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end)
  652. {
  653.     index_t i;
  654.     bool found_start = false;
  655.    
  656.     ASSERT(start != NULL);
  657.     ASSERT(end != NULL);
  658.    
  659.     for (i = *start; i < len; i++) {
  660.         if (!found_start) {
  661.             if (isspace(cmdline[i]))
  662.                 (*start)++;
  663.             else
  664.                 found_start = true;
  665.         } else {
  666.             if (isspace(cmdline[i]))
  667.                 break;
  668.         }
  669.     }
  670.     *end = i - 1;
  671.  
  672.     return found_start;
  673. }
  674.  
  675. /** @}
  676.  */
  677.