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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 amd64
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <cpu.h>
  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 <fpu_context.h>
  44.  
  45. /*
  46.  * Identification of CPUs.
  47.  * Contains only non-MP-Specification specific SMP code.
  48.  */
  49. #define AMD_CPUID_EBX   0x68747541
  50. #define AMD_CPUID_ECX   0x444d4163
  51. #define AMD_CPUID_EDX   0x69746e65
  52.  
  53. #define INTEL_CPUID_EBX 0x756e6547
  54. #define INTEL_CPUID_ECX 0x6c65746e
  55. #define INTEL_CPUID_EDX 0x49656e69
  56.  
  57.  
  58. enum vendor {
  59.     VendorUnknown = 0,
  60.     VendorAMD,
  61.     VendorIntel
  62. };
  63.  
  64. static char *vendor_str[] = {
  65.     "Unknown Vendor",
  66.     "AuthenticAMD",
  67.     "GenuineIntel"
  68. };
  69.  
  70.  
  71. /** Setup flags on processor so that we can use the FPU
  72.  *
  73.  * cr0.osfxsr = 1 -> we do support fxstor/fxrestor
  74.  * cr0.em = 0 -> we do not emulate coprocessor
  75.  * cr0.mp = 1 -> we do want lazy context switch
  76.  */
  77. void cpu_setup_fpu(void)
  78. {
  79.     asm volatile (
  80.         "movq %%cr0, %%rax\n"
  81.         "btsq $1, %%rax\n"  /* cr0.mp */
  82.         "btrq $2, %%rax\n"  /* cr0.em */
  83.         "movq %%rax, %%cr0\n"
  84.        
  85.         "movq %%cr4, %%rax\n"
  86.         "bts $9, %%rax\n"   /* cr4.osfxsr */
  87.         "movq %%rax, %%cr4\n"
  88.         ::: "%rax"
  89.     );
  90. }
  91.  
  92. /** Set the TS flag to 1.
  93.  *
  94.  * If a thread accesses coprocessor, exception is run, which
  95.  * does a lazy fpu context switch.
  96.  *
  97.  */
  98. void fpu_disable(void)
  99. {
  100.     asm volatile (
  101.         "mov %%cr0, %%rax\n"
  102.         "bts $3, %%rax\n"
  103.         "mov %%rax, %%cr0\n"
  104.         ::: "%rax"
  105.     );
  106. }
  107.  
  108. void fpu_enable(void)
  109. {
  110.     asm volatile (
  111.         "mov %%cr0, %%rax\n"
  112.         "btr $3, %%rax\n"
  113.         "mov %%rax, %%cr0\n"
  114.         ::: "%rax"
  115.     );
  116. }
  117.  
  118. void cpu_arch_init(void)
  119. {
  120.     CPU->arch.tss = tss_p;
  121.     CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] -
  122.         ((uint8_t *) CPU->arch.tss);
  123.     CPU->fpu_owner = NULL;
  124. }
  125.  
  126. void cpu_identify(void)
  127. {
  128.     cpu_info_t info;
  129.  
  130.     CPU->arch.vendor = VendorUnknown;
  131.     if (has_cpuid()) {
  132.         cpuid(0, &info);
  133.  
  134.         /*
  135.          * Check for AMD processor.
  136.          */
  137.         if (info.cpuid_ebx == AMD_CPUID_EBX &&
  138.             info.cpuid_ecx == AMD_CPUID_ECX &&
  139.             info.cpuid_edx == AMD_CPUID_EDX) {
  140.             CPU->arch.vendor = VendorAMD;
  141.         }
  142.  
  143.         /*
  144.          * Check for Intel processor.
  145.          */    
  146.         if (info.cpuid_ebx == INTEL_CPUID_EBX &&
  147.             info.cpuid_ecx == INTEL_CPUID_ECX &&
  148.             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,
  163.         m->arch.stepping, m->frequency_mhz);
  164. }
  165.  
  166. /** @}
  167.  */
  168.