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  1. /*
  2.  * Copyright (C) 2001-2004 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 generic
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief   Miscellaneous functions.
  36.  */
  37.  
  38. #include <func.h>
  39. #include <print.h>
  40. #include <cpu.h>
  41. #include <arch/asm.h>
  42. #include <arch.h>
  43. #include <typedefs.h>
  44. #include <console/kconsole.h>
  45.  
  46. atomic_t haltstate = {0}; /**< Halt flag */
  47.  
  48.  
  49. /** Halt wrapper
  50.  *
  51.  * Set halt flag and halt the cpu.
  52.  *
  53.  */
  54. void halt()
  55. {
  56. #ifdef CONFIG_DEBUG
  57.     bool rundebugger = false;
  58.  
  59. //      TODO test_and_set not defined on all arches
  60. //  if (!test_and_set(&haltstate))
  61.     if (!atomic_get(&haltstate)) {
  62.         atomic_set(&haltstate, 1);
  63.         rundebugger = true;
  64.     }
  65. #else
  66.     atomic_set(&haltstate, 1);
  67. #endif
  68.  
  69.     interrupts_disable();
  70. #ifdef CONFIG_DEBUG
  71.     if (rundebugger) {
  72.         printf("\n");
  73.         kconsole("panic"); /* Run kconsole as a last resort to user */
  74.     }
  75. #endif      
  76.     if (CPU)
  77.         printf("cpu%d: halted\n", CPU->id);
  78.     else
  79.         printf("cpu: halted\n");
  80.     cpu_halt();
  81. }
  82.  
  83. /** Return number of characters in a string.
  84.  *
  85.  * @param str NULL terminated string.
  86.  *
  87.  * @return Number of characters in str.
  88.  */
  89. size_t strlen(const char *str)
  90. {
  91.     int i;
  92.    
  93.     for (i = 0; str[i]; i++)
  94.         ;
  95.    
  96.     return i;
  97. }
  98.  
  99. /** Compare two NULL terminated strings
  100.  *
  101.  * Do a char-by-char comparison of two NULL terminated strings.
  102.  * The strings are considered equal iff they consist of the same
  103.  * characters on the minimum of their lengths and specified maximal
  104.  * length.
  105.  *
  106.  * @param src First string to compare.
  107.  * @param dst Second string to compare.
  108.  * @param len Maximal length for comparison.
  109.  *
  110.  * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
  111.  *
  112.  */
  113. int strncmp(const char *src, const char *dst, size_t len)
  114. {
  115.     int i;
  116.    
  117.     i = 0;
  118.     for (;*src && *dst && i < len;src++,dst++,i++) {
  119.         if (*src < *dst)
  120.             return -1;
  121.         if (*src > *dst)
  122.             return 1;
  123.     }
  124.     if (i == len || *src == *dst)
  125.         return 0;
  126.     if (!*src)
  127.         return -1;
  128.     return 1;
  129. }
  130.  
  131. /** Copy NULL terminated string.
  132.  *
  133.  * Copy at most 'len' characters from string 'src' to 'dest'.
  134.  * If 'src' is shorter than 'len', '\0' is inserted behind the
  135.  * last copied character.
  136.  *
  137.  * @param src Source string.
  138.  * @param dest Destination buffer.
  139.  * @param len Size of destination buffer.
  140.  */
  141. void strncpy(char *dest, const char *src, size_t len)
  142. {
  143.     int i;
  144.     for (i = 0; i < len; i++) {
  145.         if (!(dest[i] = src[i]))
  146.             return;
  147.     }
  148.     dest[i-1] = '\0';
  149. }
  150.  
  151. /** Convert ascii representation to unative_t
  152.  *
  153.  * Supports 0x for hexa & 0 for octal notation.
  154.  * Does not check for overflows, does not support negative numbers
  155.  *
  156.  * @param text Textual representation of number
  157.  * @return Converted number or 0 if no valid number ofund
  158.  */
  159. unative_t atoi(const char *text)
  160. {
  161.     int base = 10;
  162.     unative_t result = 0;
  163.  
  164.     if (text[0] == '0' && text[1] == 'x') {
  165.         base = 16;
  166.         text += 2;
  167.     } else if (text[0] == '0')
  168.         base = 8;
  169.  
  170.     while (*text) {
  171.         if (base != 16 && \
  172.             ((*text >= 'A' && *text <= 'F' )
  173.              || (*text >='a' && *text <='f')))
  174.             break;
  175.         if (base == 8 && *text >='8')
  176.             break;
  177.  
  178.         if (*text >= '0' && *text <= '9') {
  179.             result *= base;
  180.             result += *text - '0';
  181.         } else if (*text >= 'A' && *text <= 'F') {
  182.             result *= base;
  183.             result += *text - 'A' + 10;
  184.         } else if (*text >= 'a' && *text <= 'f') {
  185.             result *= base;
  186.             result += *text - 'a' + 10;
  187.         } else
  188.             break;
  189.         text++;
  190.     }
  191.  
  192.     return result;
  193. }
  194.  
  195. /** @}
  196.  */
  197.