| Patrick Georgi | 40a3e32 | 2015-06-22 19:41:29 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2014 Google Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc. |
| 18 | */ |
| 19 | |
| 20 | #include <cbmem.h> |
| 21 | #include <soc/addressmap.h> |
| 22 | |
| 23 | void *cbmem_top(void) |
| 24 | { |
| 25 | static uintptr_t addr; |
| 26 | |
| 27 | if (addr == 0) { |
| 28 | uintptr_t begin_mib; |
| 29 | uintptr_t end_mib; |
| 30 | |
| 31 | memory_in_range_below_4gb(&begin_mib, &end_mib); |
| 32 | /* Make sure we consume everything up to 4GIB. */ |
| 33 | if (end_mib == 4096) |
| 34 | addr = ~(uint32_t)0; |
| 35 | else |
| 36 | addr = end_mib << 20; |
| 37 | } |
| 38 | |
| 39 | return (void *)addr; |
| 40 | } |