diff options
Diffstat (limited to 'src/soc/nvidia/tegra210/cbmem.c')
-rw-r--r-- | src/soc/nvidia/tegra210/cbmem.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra210/cbmem.c b/src/soc/nvidia/tegra210/cbmem.c new file mode 100644 index 0000000000..c161a36d3b --- /dev/null +++ b/src/soc/nvidia/tegra210/cbmem.c @@ -0,0 +1,40 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2014 Google Inc. + * + * 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. + */ + +#include <cbmem.h> +#include <soc/addressmap.h> + +void *cbmem_top(void) +{ + static uintptr_t addr; + + if (addr == 0) { + uintptr_t begin_mib; + uintptr_t end_mib; + + memory_in_range_below_4gb(&begin_mib, &end_mib); + /* Make sure we consume everything up to 4GIB. */ + if (end_mib == 4096) + addr = ~(uint32_t)0; + else + addr = end_mib << 20; + } + + return (void *)addr; +} |