src/cpu/intel/car/p4-netburst/exit_car.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <cpu/intel/post_codes.h>
   4 #include <cpu/x86/mtrr.h>
   5 #include <cpu/x86/cache.h>
   6 #include <cpu/x86/post_code.h>
   7
   8 .code32
   9 .global chipset_teardown_car
  10
  11 chipset_teardown_car:
  12         pop %esp
  13
  14         post_code(POSTCODE_POSTCAR_DISABLE_CACHE)
  15
  16         /* Disable cache. */
  17         movl    %cr0, %eax
  18         orl     $CR0_CacheDisable, %eax
  19         movl    %eax, %cr0
  20
  21         post_code(POSTCODE_POSTCAR_DISABLE_DEF_MTRR)
  22
  23         /* Disable MTRR. */
  24         movl    $MTRR_DEF_TYPE_MSR, %ecx
  25         rdmsr
  26         andl    $(~MTRR_DEF_TYPE_EN), %eax
  27         wrmsr
  28
  29         post_code(POSTCODE_POSTCAR_TEARDOWN_DONE)
  30
  31         /* Return to caller. */
  32         jmp     *%esp