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