| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/cache.h> |
| #include <cpu/x86/post_code.h> |
| |
| #define NoEvictMod_MSR 0x2e0 |
| |
| .code32 |
| .global chipset_teardown_car |
| |
| chipset_teardown_car: |
| pop %esp |
| |
| post_code(0x30) |
| |
| /* Disable cache. */ |
| movl %cr0, %eax |
| orl $CR0_CacheDisable, %eax |
| movl %eax, %cr0 |
| |
| post_code(0x31) |
| |
| /* Disable MTRR. */ |
| movl $MTRR_DEF_TYPE_MSR, %ecx |
| rdmsr |
| andl $(~MTRR_DEF_TYPE_EN), %eax |
| wrmsr |
| |
| /* Disable the no eviction run state */ |
| movl $NoEvictMod_MSR, %ecx |
| rdmsr |
| andl $~2, %eax |
| wrmsr |
| andl $~1, %eax |
| wrmsr |
| |
| post_code(0x32) |
| |
| /* Return to caller. */ |
| jmp *%esp |