| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2013 Google, Inc. |
| * Copyright (C) 2015 Intel Corp. |
| * |
| * 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 wacbmem_entryanty 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. |
| */ |
| |
| #include <arch/io.h> |
| #include <cbmem.h> |
| #include <console/console.h> |
| #include <soc/intel/common/memmap.h> |
| #include <soc/iosf.h> |
| #include <soc/smm.h> |
| |
| static size_t smm_region_size(void) |
| { |
| u32 smm_size; |
| smm_size = iosf_bunit_read(BUNIT_SMRRH) & 0xFFFF; |
| smm_size -= iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF; |
| smm_size = (smm_size + 1) << 20; |
| return smm_size; |
| } |
| |
| void smm_region(void **start, size_t *size) |
| { |
| *start = (void *)((iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF) << 20); |
| *size = smm_region_size(); |
| } |
| |
| size_t mmap_region_granluarity(void) |
| { |
| /* Align to TSEG size when SMM is in use, and 8MiB by default */ |
| return IS_ENABLED(CONFIG_HAVE_SMI_HANDLER) ? smm_region_size() |
| : 8 << 20; |
| } |
| |
| void *cbmem_top(void) |
| { |
| char *smm_base; |
| size_t smm_size; |
| |
| /* |
| * +-------------------------+ Top of RAM (aligned) |
| * | System Management Mode | |
| * | code and data | Length: CONFIG_TSEG_SIZE |
| * | (TSEG) | |
| * +-------------------------+ SMM base (aligned) |
| * | | |
| * | Chipset Reserved Memory | Length: Multiple of CONFIG_TSEG_SIZE |
| * | | |
| * +-------------------------+ top_of_ram (aligned) |
| * | | |
| * | CBMEM Root | |
| * | | |
| * +-------------------------+ |
| * | | |
| * | FSP Reserved Memory | |
| * | | |
| * +-------------------------+ |
| * | | |
| * | Various CBMEM Entries | |
| * | | |
| * +-------------------------+ top_of_stack (8 byte aligned) |
| * | | |
| * | stack (CBMEM Entry) | |
| * | | |
| * +-------------------------+ |
| */ |
| |
| smm_region((void **)&smm_base, &smm_size); |
| return (void *)(smm_base - CONFIG_CHIPSET_RESERVED_MEM_BYTES); |
| } |