41 lines
1 KiB
C
41 lines
1 KiB
C
|
/*
|
||
|
|
* 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;
|
||
|
|
}
|