src/cpu/intel/car/non-evict/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 #define NoEvictMod_MSR 0x2e0
   9
  10 .code32
  11 .global chipset_teardown_car
  12
  13 chipset_teardown_car:
  14         pop %esp
  15
  16         post_code(POSTCODE_POSTCAR_DISABLE_CACHE)
  17
  18         /* Disable cache. */
  19         movl    %cr0, %eax
  20         orl     $CR0_CacheDisable, %eax
  21         movl    %eax, %cr0
  22
  23         post_code(POSTCODE_POSTCAR_DISABLE_DEF_MTRR)
  24
  25         /* Disable MTRR. */
  26         movl    $MTRR_DEF_TYPE_MSR, %ecx
  27         rdmsr
  28         andl    $(~MTRR_DEF_TYPE_EN), %eax
  29         wrmsr
  30
  31         /* Disable the no eviction run state */
  32         movl    $NoEvictMod_MSR, %ecx
  33         rdmsr
  34         andl    $~2, %eax
  35         wrmsr
  36         andl    $~1, %eax
  37         wrmsr
  38
  39         post_code(POSTCODE_POSTCAR_TEARDOWN_DONE)
  40
  41         /* Return to caller. */
  42         jmp     *%esp