2 * This file is part of the coreboot project.
4 * Copyright (C) 2009 coresystems GmbH
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.
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.
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., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
23 #include <console/console.h>
25 // The CBMEM TOC reserves 512 bytes to keep
26 // the other entries somewhat aligned.
27 // Increase if MAX_CBMEM_ENTRIES exceeds 21
28 #define CBMEM_TOC_RESERVED 512
29 #define MAX_CBMEM_ENTRIES 16
30 #define CBMEM_MAGIC 0x434f5245
37 } __attribute__((packed));
40 struct cbmem_entry *bss_cbmem_toc;
41 #define get_cbmem_toc() bss_cbmem_toc
43 #define get_cbmem_toc() (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE)
47 * cbmem is a simple mechanism to do some kind of book keeping of the coreboot
48 * high tables memory. This is a small amount of memory which is "stolen" from
49 * the system memory for coreboot purposes. Usually this memory is used for
50 * - the coreboot table
51 * - legacy tables (PIRQ, MP table)
53 * - suspend/resume backup memory
56 void cbmem_init(u64 baseaddr, u64 size)
58 struct cbmem_entry *cbmem_toc;
59 cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr;
62 bss_cbmem_toc = cbmem_toc;
65 printk(BIOS_DEBUG, "Initializing CBMEM area to 0x%llx (%lld bytes)\n",
68 if (size < (64 * 1024)) {
69 printk(BIOS_DEBUG, "Increase CBMEM size!\n");
73 memset(cbmem_toc, 0, CBMEM_TOC_RESERVED);
75 cbmem_toc[0] = (struct cbmem_entry) {
77 .id = CBMEM_ID_FREESPACE,
78 .base = baseaddr + CBMEM_TOC_RESERVED,
79 .size = size - CBMEM_TOC_RESERVED
83 int cbmem_reinit(u64 baseaddr)
85 struct cbmem_entry *cbmem_toc;
86 cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr;
88 printk(BIOS_DEBUG, "Re-Initializing CBMEM area to 0x%lx\n",
89 (unsigned long)baseaddr);
92 bss_cbmem_toc = cbmem_toc;
95 return (cbmem_toc[0].magic == CBMEM_MAGIC);
98 void *cbmem_add(u32 id, u64 size)
100 struct cbmem_entry *cbmem_toc;
102 cbmem_toc = get_cbmem_toc();
104 if (cbmem_toc == NULL) {
108 if (cbmem_toc[0].magic != CBMEM_MAGIC) {
109 printk(BIOS_ERR, "ERROR: CBMEM was not initialized yet.\n");
113 /* Will the entry fit at all? */
114 if (size > cbmem_toc[0].size) {
115 printk(BIOS_ERR, "ERROR: Not enough memory for table %x\n", id);
119 /* Align size to 512 byte blocks */
121 size = ALIGN(size, 512) < cbmem_toc[0].size ?
122 ALIGN(size, 512) : cbmem_toc[0].size;
124 /* Now look for the first free/usable TOC entry */
125 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
126 if (cbmem_toc[i].id == CBMEM_ID_NONE)
130 if (i >= MAX_CBMEM_ENTRIES) {
131 printk(BIOS_ERR, "ERROR: No more CBMEM entries available.\n");
135 printk(BIOS_DEBUG, "Adding CBMEM entry as no. %d\n", i);
137 cbmem_toc[i] = (struct cbmem_entry) {
138 .magic = CBMEM_MAGIC,
140 .base = cbmem_toc[0].base,
144 cbmem_toc[0].base += size;
145 cbmem_toc[0].size -= size;
147 return (void *)(u32)cbmem_toc[i].base;
150 void *cbmem_find(u32 id)
152 struct cbmem_entry *cbmem_toc;
154 cbmem_toc = get_cbmem_toc();
156 if (cbmem_toc == NULL)
159 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
160 if (cbmem_toc[i].id == id)
161 return (void *)(unsigned long)cbmem_toc[i].base;
168 #if CONFIG_HAVE_ACPI_RESUME
169 extern u8 acpi_slp_type;
171 extern uint64_t high_tables_base, high_tables_size;
173 void cbmem_initialize(void)
175 #if CONFIG_HAVE_ACPI_RESUME
176 if (acpi_slp_type == 3) {
177 if (!cbmem_reinit(high_tables_base)) {
178 /* Something went wrong, our high memory area got wiped */
180 cbmem_init(high_tables_base, high_tables_size);
183 cbmem_init(high_tables_base, high_tables_size);
186 cbmem_init(high_tables_base, high_tables_size);
192 void cbmem_list(void)
194 struct cbmem_entry *cbmem_toc;
196 cbmem_toc = get_cbmem_toc();
198 if (cbmem_toc == NULL)
201 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
203 if (cbmem_toc[i].magic != CBMEM_MAGIC)
205 printk(BIOS_DEBUG, "%2d. ", i);
206 switch (cbmem_toc[i].id) {
207 case CBMEM_ID_FREESPACE: printk(BIOS_DEBUG, "FREE SPACE "); break;
208 case CBMEM_ID_GDT: printk(BIOS_DEBUG, "GDT "); break;
209 case CBMEM_ID_ACPI: printk(BIOS_DEBUG, "ACPI "); break;
210 case CBMEM_ID_CBTABLE: printk(BIOS_DEBUG, "COREBOOT "); break;
211 case CBMEM_ID_PIRQ: printk(BIOS_DEBUG, "IRQ TABLE "); break;
212 case CBMEM_ID_MPTABLE: printk(BIOS_DEBUG, "SMP TABLE "); break;
213 case CBMEM_ID_RESUME: printk(BIOS_DEBUG, "ACPI RESUME"); break;
214 default: printk(BIOS_DEBUG, "%08x ", cbmem_toc[i].id);
216 printk(BIOS_DEBUG, "%08llx ", cbmem_toc[i].base);
217 printk(BIOS_DEBUG, "%08llx\n", cbmem_toc[i].size);