diff options
Diffstat (limited to 'src/soc/intel/common/block/cpu')
| -rw-r--r-- | src/soc/intel/common/block/cpu/car/exit_car.S | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/cpu/car/exit_car.S b/src/soc/intel/common/block/cpu/car/exit_car.S index 15e7f17358..86feddca43 100644 --- a/src/soc/intel/common/block/cpu/car/exit_car.S +++ b/src/soc/intel/common/block/cpu/car/exit_car.S @@ -22,6 +22,21 @@ .global chipset_teardown_car chipset_teardown_car: +#if IS_ENABLED(CONFIG_PAGING_IN_CACHE_AS_RAM) + /* + * Since Page table is located in CAR, disable paging before CAR + * teardown. Also clear CR3 and CR4.PAE. + */ + mov %cr0, %eax + and $(~(CR0_PG)), %eax + mov %eax, %cr0 + xor %eax, %eax + mov %eax, %cr3 + mov %cr4, %eax + and $(~(CR4_PAE)), %eax + mov %eax, %cr4 +#endif + /* * Retrieve return address from stack as it will get trashed below if * execution is utilizing the cache-as-ram stack. |