| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2010 coresystems GmbH |
| * Copyright (C) 2010 Rudolf Marek |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <console/console.h> |
| #include <arch/io.h> |
| #include <cpu/cpu.h> |
| #include <cpu/x86/lapic.h> |
| #include <cpu/x86/msr.h> |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/amd/mtrr.h> |
| #include <cpu/amd/model_fxx_msr.h> |
| #include <cpu/x86/cache.h> |
| #include <cpu/x86/smm.h> |
| #include <string.h> |
| |
| extern unsigned char _binary_smm_start; |
| extern unsigned char _binary_smm_size; |
| |
| void smm_init(void) |
| { |
| msr_t msr, syscfg_orig, mtrr_aseg_orig; |
| |
| /* Back up MSRs for later restore */ |
| syscfg_orig = rdmsr(SYSCFG_MSR); |
| mtrr_aseg_orig = rdmsr(MTRRfix16K_A0000_MSR); |
| |
| /* MTRR changes don't like an enabled cache */ |
| disable_cache(); |
| |
| msr = syscfg_orig; |
| |
| /* Allow changes to MTRR extended attributes */ |
| msr.lo |= SYSCFG_MSR_MtrrFixDramModEn; |
| /* turn the extended attributes off until we fix |
| * them so A0000 is routed to memory |
| */ |
| msr.lo &= ~SYSCFG_MSR_MtrrFixDramEn; |
| wrmsr(SYSCFG_MSR, msr); |
| |
| /* set DRAM access to 0xa0000 */ |
| msr.lo = 0x18181818; |
| msr.hi = 0x18181818; |
| wrmsr(MTRRfix16K_A0000_MSR, msr); |
| |
| /* enable the extended features */ |
| msr = syscfg_orig; |
| msr.lo |= SYSCFG_MSR_MtrrFixDramModEn; |
| msr.lo |= SYSCFG_MSR_MtrrFixDramEn; |
| wrmsr(SYSCFG_MSR, msr); |
| |
| enable_cache(); |
| /* copy the real SMM handler */ |
| memcpy((void *)SMM_BASE, &_binary_smm_start, (size_t)&_binary_smm_size); |
| wbinvd(); |
| disable_cache(); |
| |
| /* Restore SYSCFG and MTRR */ |
| wrmsr(SYSCFG_MSR, syscfg_orig); |
| wrmsr(MTRRfix16K_A0000_MSR, mtrr_aseg_orig); |
| enable_cache(); |
| |
| /* CPU MSR are set in CPU init */ |
| } |
| |
| void smm_lock(void) |
| { |
| /* We lock SMM in CPU init */ |
| } |