| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2015 - 2017 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; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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. |
| */ |
| |
| #include <cbmem.h> |
| #include <assert.h> |
| #include <device/device.h> |
| #include <device/pci_def.h> |
| #include <device/pci_ops.h> |
| #include <soc/pci_devs.h> |
| #include <soc/systemagent.h> |
| #include <soc/smm.h> |
| #include <lib.h> |
| |
| /* Returns base of requested region encoded in the system agent. */ |
| static inline uintptr_t system_agent_region_base(size_t reg) |
| { |
| #if defined(__SIMPLE_DEVICE__) |
| pci_devfn_t dev = SA_DEV_ROOT; |
| #else |
| struct device *dev = SA_DEV_ROOT; |
| #endif |
| /* All regions concerned for have 1 MiB alignment. */ |
| return ALIGN_DOWN(pci_read_config32(dev, reg), 1 * MiB); |
| } |
| |
| /* Returns min power of 2 >= size */ |
| static inline u32 power_of_2(u32 size) |
| { |
| return size ? 1 << (1 + log2(size - 1)) : 0; |
| } |
| |
| u32 top_of_32bit_ram(void) |
| { |
| u32 iqat_region_size = 0; |
| u32 tseg_region_size = system_agent_region_base(TOLUD) - |
| system_agent_region_base(TSEGMB); |
| |
| /* |
| * Add IQAT region size if enabled. |
| */ |
| #if CONFIG(IQAT_ENABLE) |
| iqat_region_size = CONFIG_IQAT_MEMORY_REGION_SIZE; |
| #endif |
| return system_agent_region_base(TOLUD) - |
| power_of_2(iqat_region_size + tseg_region_size); |
| } |
| |
| void *cbmem_top(void) { return (void *)top_of_32bit_ram(); } |
| |
| static inline uintptr_t smm_region_start(void) |
| { |
| return system_agent_region_base(TSEGMB); |
| } |
| |
| static inline size_t smm_region_size(void) |
| { |
| return system_agent_region_base(TOLUD) - smm_region_start(); |
| } |
| |
| void smm_region(void **start, size_t *size) |
| { |
| *start = (void *)smm_region_start(); |
| *size = smm_region_size(); |
| } |
| |
| int smm_subregion(int sub, void **start, size_t *size) |
| { |
| uintptr_t sub_base; |
| size_t sub_size; |
| const size_t cache_size = CONFIG_SMM_RESERVED_SIZE; |
| |
| sub_base = smm_region_start(); |
| sub_size = smm_region_size(); |
| |
| assert(sub_size > CONFIG_SMM_RESERVED_SIZE); |
| |
| switch (sub) { |
| case SMM_SUBREGION_HANDLER: |
| /* Handler starts at the base of TSEG. */ |
| sub_size -= cache_size; |
| break; |
| case SMM_SUBREGION_CACHE: |
| /* External cache is in the middle of TSEG. */ |
| sub_base += sub_size - cache_size; |
| sub_size = cache_size; |
| break; |
| default: |
| return -1; |
| } |
| |
| *start = (void *)sub_base; |
| *size = sub_size; |
| |
| return 0; |
| } |