2 * Copyright (c) 2011 The Chromium OS Authors.
3 * (C) Copyright 2010,2011
4 * Graeme Russ, <graeme.russ@gmail.com>
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but without any warranty; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/u-boot-x86.h>
29 #include <asm/global_data.h>
30 #include <asm/processor.h>
31 #include <asm/arch/sysinfo.h>
32 #include <asm/arch/tables.h>
34 DECLARE_GLOBAL_DATA_PTR;
36 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
40 unsigned num_entries = min(lib_sysinfo.n_memranges, max_entries);
41 if (num_entries < lib_sysinfo.n_memranges) {
42 printf("Warning: Limiting e820 map to %d entries.\n",
45 for (i = 0; i < num_entries; i++) {
46 struct memrange *memrange = &lib_sysinfo.memrange[i];
48 entries[i].addr = memrange->base;
49 entries[i].size = memrange->size;
50 entries[i].type = memrange->type;
56 * This function looks for the highest region of memory lower than 4GB which
57 * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
58 * overrides the default implementation found elsewhere which simply picks the
59 * end of ram, wherever that may be. The location of the stack, the relocation
60 * address, and how far U-Boot is moved by relocation are set in the global
63 ulong board_get_usable_ram_top(ulong total_size)
65 uintptr_t dest_addr = 0;
68 for (i = 0; i < lib_sysinfo.n_memranges; i++) {
69 struct memrange *memrange = &lib_sysinfo.memrange[i];
70 /* Force U-Boot to relocate to a page aligned address. */
71 uint64_t start = roundup(memrange->base, 1 << 12);
72 uint64_t end = memrange->base + memrange->size;
74 /* Ignore non-memory regions. */
75 if (memrange->type != CB_MEM_RAM)
78 /* Filter memory over 4GB. */
79 if (end > 0xffffffffULL)
81 /* Skip this region if it's too small. */
82 if (end - start < total_size)
85 /* Use this address if it's the largest so far. */
90 /* If no suitable area was found, return an error. */
92 panic("No available memory found for relocation");
94 return (ulong)dest_addr;
100 phys_size_t ram_size = 0;
102 for (i = 0; i < lib_sysinfo.n_memranges; i++) {
103 struct memrange *memrange = &lib_sysinfo.memrange[i];
104 unsigned long long end = memrange->base + memrange->size;
106 if (memrange->type == CB_MEM_RAM && end > ram_size)
109 gd->ram_size = ram_size;
119 if (CONFIG_NR_DRAM_BANKS) {
120 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
121 struct memrange *memrange = &lib_sysinfo.memrange[i];
123 if (memrange->type == CB_MEM_RAM) {
124 gd->bd->bi_dram[j].start = memrange->base;
125 gd->bd->bi_dram[j].size = memrange->size;
127 if (j >= CONFIG_NR_DRAM_BANKS)