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  1. /*
  2.  * Copyright (c) 2007 Michal Kebrt
  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 arm32
  30.  * @{
  31.  */
  32. /** @file
  33.  *  @brief CPU identification.
  34.  */
  35.  
  36. #include <arch/cpu.h>
  37. #include <cpu.h>
  38. #include <arch.h>
  39. #include <print.h> 
  40.  
  41.  
  42. /** Number of indexes left out in the #imp_data array */
  43. #define IMP_DATA_START_OFFSET 0x40
  44.  
  45. /** Implementators (vendor) names */
  46. static char * imp_data[] = {
  47.     "?",                                 /* IMP_DATA_START_OFFSET */
  48.     "ARM Ltd",                           /* 0x41 */
  49.     "",                                  /* 0x42 */
  50.     "",                                  /* 0x43 */
  51.     "Digital Equipment Corporation",     /* 0x44 */
  52.     "", "", "", "", "", "", "", "", "", "", "",                     /* 0x4f */
  53.     "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", /* 0x5f */
  54.     "", "", "", "", "", "", "", "", "",  /* 0x68 */
  55.     "Intel Corporation"                  /* 0x69 */
  56. };
  57.  
  58. /** Length of the #imp_data array */
  59. static int imp_data_length = sizeof(imp_data)/sizeof(char *);
  60.  
  61. /** Architecture names */
  62. static char * arch_data[] = {
  63.     "?",       /* 0x0 */
  64.     "4",       /* 0x1 */
  65.     "4T",      /* 0x2 */
  66.     "5",       /* 0x3 */
  67.     "5T",      /* 0x4 */
  68.     "5TE",     /* 0x5 */
  69.     "5TEJ",    /* 0x6 */
  70.     "6"        /* 0x7 */
  71. };
  72.  
  73. /** Length of the #arch_data array */
  74. static int arch_data_length = sizeof(arch_data)/sizeof(char *);
  75.  
  76.  
  77. /** Retrieves processor identification from CP15 register 0.
  78.  *
  79.  * @param cpu Structure for storing CPU identification.
  80.  */
  81. static void arch_cpu_identify(cpu_arch_t * cpu)
  82. {
  83.     uint32_t ident;
  84.     asm volatile (
  85.         "mrc p15, 0, %0, c0, c0, 0  \n"
  86.         : "=r" (ident)
  87.     );
  88.  
  89.     cpu->imp_num = ident >> 24;
  90.     cpu->variant_num = (ident << 8) >> 28;
  91.     cpu->arch_num = (ident << 12) >> 28;
  92.     cpu->prim_part_num = (ident << 16) >> 20;
  93.     cpu->rev_num = (ident << 28) >> 28;
  94. }
  95.  
  96.  
  97. /** Does nothing on ARM. */
  98. void cpu_arch_init(void)
  99. {
  100. }
  101.  
  102.  
  103. /** Retrieves processor identification and stores it to #CPU.arch */
  104. void cpu_identify(void)
  105. {
  106.     arch_cpu_identify(&CPU->arch);
  107. }
  108.  
  109.  
  110. /** Prints CPU identification. */
  111. void cpu_print_report(cpu_t *m)
  112. {
  113.     char * vendor = imp_data[0];
  114.     char * architecture = arch_data[0];
  115.     cpu_arch_t * cpu_arch = &m->arch;
  116.  
  117.     if ( (cpu_arch->imp_num) > 0 && (cpu_arch->imp_num < (imp_data_length + IMP_DATA_START_OFFSET)) ) {
  118.         vendor = imp_data[cpu_arch->imp_num - IMP_DATA_START_OFFSET];
  119.     }
  120.  
  121.     if ( (cpu_arch->arch_num) > 0 && (cpu_arch->arch_num < arch_data_length) ) {
  122.         architecture = arch_data[cpu_arch->arch_num];
  123.     }
  124.  
  125.     printf("cpu%d: vendor=%s, architecture=ARM %s, part number=%x, variant=%x, revision=%x\n",
  126.         m->id, vendor, architecture, cpu_arch->prim_part_num, cpu_arch->variant_num, cpu_arch->rev_num);
  127. }
  128.  
  129. /** @}
  130.  */
  131.