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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. /** Number of indexes left out in the #imp_data array */
  42. #define IMP_DATA_START_OFFSET 0x40
  43.  
  44. /** Implementators (vendor) names */
  45. static char *imp_data[] = {
  46.     "?",                    /* IMP_DATA_START_OFFSET */
  47.     "ARM Ltd",              /* 0x41 */
  48.     "",                 /* 0x42 */
  49.     "",                                 /* 0x43 */
  50.     "Digital Equipment Corporation",    /* 0x44 */
  51.     "", "", "", "", "", "", "", "", "", "", /* 0x45 - 0x4e */
  52.     "", "", "", "", "", "", "", "", "", "", /* 0x4f - 0x58 */
  53.     "", "", "", "", "", "", "", "", "", "", /* 0x59 - 0x62 */
  54.     "", "", "", "", "", "",         /* 0x63 - 0x68 */
  55.     "Intel Corporation"         /* 0x69 */
  56. };
  57.  
  58. /** Length of the #imp_data array */
  59. static unsigned 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 unsigned 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. /** Does nothing on ARM. */
  97. void cpu_arch_init(void)
  98. {
  99. }
  100.  
  101. /** Retrieves processor identification and stores it to #CPU.arch */
  102. void cpu_identify(void)
  103. {
  104.     arch_cpu_identify(&CPU->arch);
  105. }
  106.  
  107. /** Prints CPU identification. */
  108. void cpu_print_report(cpu_t *m)
  109. {
  110.     char * vendor = imp_data[0];
  111.     char * architecture = arch_data[0];
  112.     cpu_arch_t * cpu_arch = &m->arch;
  113.  
  114.     if ((cpu_arch->imp_num) > 0 &&
  115.         (cpu_arch->imp_num < (imp_data_length + IMP_DATA_START_OFFSET))) {
  116.         vendor = imp_data[cpu_arch->imp_num - IMP_DATA_START_OFFSET];
  117.     }
  118.  
  119.     if ((cpu_arch->arch_num) > 0 &&
  120.         (cpu_arch->arch_num < arch_data_length)) {
  121.         architecture = arch_data[cpu_arch->arch_num];
  122.     }
  123.  
  124.     printf("cpu%d: vendor=%s, architecture=ARM%s, part number=%x, "
  125.         "variant=%x, revision=%x\n",
  126.         m->id, vendor, architecture, cpu_arch->prim_part_num,
  127.         cpu_arch->variant_num, cpu_arch->rev_num);
  128. }
  129.  
  130. /** @}
  131.  */
  132.