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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 ia32cpu ia32
  30.  * @ingroup cpu
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <arch/cpu.h>
  37. #include <arch/cpuid.h>
  38. #include <arch/pm.h>
  39.  
  40. #include <arch.h>
  41. #include <arch/types.h>
  42. #include <print.h>
  43. #include <typedefs.h>
  44. #include <fpu_context.h>
  45.  
  46. #include <arch/smp/apic.h>
  47.  
  48. /*
  49.  * Identification of CPUs.
  50.  * Contains only non-MP-Specification specific SMP code.
  51.  */
  52. #define AMD_CPUID_EBX   0x68747541
  53. #define AMD_CPUID_ECX   0x444d4163
  54. #define AMD_CPUID_EDX   0x69746e65
  55.  
  56. #define INTEL_CPUID_EBX 0x756e6547
  57. #define INTEL_CPUID_ECX 0x6c65746e
  58. #define INTEL_CPUID_EDX 0x49656e69
  59.  
  60.  
  61. enum vendor {
  62.     VendorUnknown=0,
  63.     VendorAMD,
  64.     VendorIntel
  65. };
  66.  
  67. static char *vendor_str[] = {
  68.     "Unknown Vendor",
  69.     "AuthenticAMD",
  70.     "GenuineIntel"
  71. };
  72.  
  73. void fpu_disable(void)
  74. {
  75.     __asm__ volatile (
  76.         "mov %%cr0,%%eax;"
  77.         "or $8,%%eax;"
  78.         "mov %%eax,%%cr0;"
  79.         :
  80.         :
  81.         :"%eax"
  82.     );
  83. }
  84.  
  85. void fpu_enable(void)
  86. {
  87.     __asm__ volatile (
  88.         "mov %%cr0,%%eax;"
  89.         "and $0xffFFffF7,%%eax;"
  90.         "mov %%eax,%%cr0;"
  91.         :
  92.         :
  93.         :"%eax"
  94.     ); 
  95. }
  96.  
  97. void cpu_arch_init(void)
  98. {
  99.     cpuid_feature_info fi;
  100.     cpuid_extended_feature_info efi;
  101.     cpu_info_t info;
  102.     __u32 help = 0;
  103.    
  104.     CPU->arch.tss = tss_p;
  105.     CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] - ((__u8 *) CPU->arch.tss);
  106.  
  107.     CPU->fpu_owner = NULL;
  108.  
  109.     cpuid(1, &info);
  110.  
  111.     fi.word = info.cpuid_edx;
  112.     efi.word = info.cpuid_ecx;
  113.    
  114.     if (fi.bits.fxsr)
  115.         fpu_fxsr();
  116.     else
  117.         fpu_fsr(); 
  118.    
  119.     if (fi.bits.sse) {
  120.         asm volatile (
  121.             "mov %%cr4,%0\n"
  122.             "or %1,%0\n"
  123.             "mov %0,%%cr4\n"
  124.             : "+r" (help)
  125.             : "i" (CR4_OSFXSR_MASK|(1<<10))
  126.         );
  127.     }
  128. }
  129.  
  130. void cpu_identify(void)
  131. {
  132.     cpu_info_t info;
  133.  
  134.     CPU->arch.vendor = VendorUnknown;
  135.     if (has_cpuid()) {
  136.         cpuid(0, &info);
  137.  
  138.         /*
  139.          * Check for AMD processor.
  140.          */
  141.         if (info.cpuid_ebx==AMD_CPUID_EBX && info.cpuid_ecx==AMD_CPUID_ECX && info.cpuid_edx==AMD_CPUID_EDX) {
  142.             CPU->arch.vendor = VendorAMD;
  143.         }
  144.  
  145.         /*
  146.          * Check for Intel processor.
  147.          */    
  148.         if (info.cpuid_ebx==INTEL_CPUID_EBX && info.cpuid_ecx==INTEL_CPUID_ECX && info.cpuid_edx==INTEL_CPUID_EDX) {
  149.             CPU->arch.vendor = VendorIntel;
  150.         }
  151.                
  152.         cpuid(1, &info);
  153.         CPU->arch.family = (info.cpuid_eax>>8)&0xf;
  154.         CPU->arch.model = (info.cpuid_eax>>4)&0xf;
  155.         CPU->arch.stepping = (info.cpuid_eax>>0)&0xf;                      
  156.     }
  157. }
  158.  
  159. void cpu_print_report(cpu_t* m)
  160. {
  161.     printf("cpu%d: (%s family=%d model=%d stepping=%d) %dMHz\n",
  162.         m->id, vendor_str[m->arch.vendor], m->arch.family, m->arch.model, m->arch.stepping,
  163.         m->frequency_mhz);
  164. }
  165.  
  166.  /** @}
  167.  */
  168.  
  169.