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>
26 #define debug(x...) printk_debug(x)
31 // The CBMEM TOC reserves 512 bytes to keep
32 // the other entries somewhat aligned.
33 // Increase if MAX_CBMEM_ENTRIES exceeds 21
34 #define CBMEM_TOC_RESERVED 512
35 #define MAX_CBMEM_ENTRIES 16
36 #define CBMEM_MAGIC 0x434f5245
38 static void *cbmem_base;
39 static int cbmem_size;
46 } __attribute__((packed));
49 struct cbmem_entry *bss_cbmem_toc;
53 * cbmem is a simple mechanism to do some kind of book keeping of the coreboot
54 * high tables memory. This is a small amount of memory which is "stolen" from
55 * the system memory for coreboot purposes. Usually this memory is used for
56 * - the coreboot table
57 * - legacy tables (PIRQ, MP table)
59 * - suspend/resume backup memory
62 void cbmem_init(u64 baseaddr, u64 size)
64 struct cbmem_entry *cbmem_toc;
65 cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr;
68 bss_cbmem_toc = cbmem_toc;
71 debug("Initializing CBMEM area to 0x%llx (%lld bytes)\n", baseaddr, size);
73 if (size < (64 * 1024)) {
74 debug("Increase CBMEM size!!\n");
78 memset(cbmem_toc, 0, CBMEM_TOC_RESERVED);
80 cbmem_toc[0] = (struct cbmem_entry) {
82 .id = CBMEM_ID_FREESPACE,
83 .base = baseaddr + CBMEM_TOC_RESERVED,
84 .size = size - CBMEM_TOC_RESERVED
88 int cbmem_reinit(u64 baseaddr)
90 struct cbmem_entry *cbmem_toc;
91 cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr;
93 debug("Re-Initializing CBMEM area to 0x%lx\n", baseaddr);
95 bss_cbmem_toc = cbmem_toc;
98 return (cbmem_toc[0].magic == CBMEM_MAGIC);
101 void *cbmem_add(u32 id, u64 size)
103 struct cbmem_entry *cbmem_toc;
106 cbmem_toc = (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE);
108 cbmem_toc = bss_cbmem_toc;
111 if (cbmem_toc == NULL) {
115 if (cbmem_toc[0].magic != CBMEM_MAGIC) {
116 printk_err("ERROR: CBMEM was not initialized yet.\n");
120 /* Will the entry fit at all? */
121 if (size > cbmem_toc[0].size) {
122 printk_err("ERROR: Not enough memory for table %x\n", id);
126 /* Align size to 512 byte blocks */
128 size = ALIGN(size, 512) < cbmem_toc[0].size ?
129 ALIGN(size, 512) : cbmem_toc[0].size;
131 /* Now look for the first free/usable TOC entry */
132 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
133 if (cbmem_toc[i].id == CBMEM_ID_NONE)
137 if (i >= MAX_CBMEM_ENTRIES) {
138 printk_err("ERROR: No more CBMEM entries available.\n");
142 debug("Adding CBMEM entry as no. %d\n", i);
144 cbmem_toc[i] = (struct cbmem_entry) {
145 .magic = CBMEM_MAGIC,
147 .base = cbmem_toc[0].base,
151 cbmem_toc[0].base += size;
152 cbmem_toc[0].size -= size;
154 return (void *)cbmem_toc[i].base;
157 void *cbmem_find(u32 id)
159 struct cbmem_entry *cbmem_toc;
162 cbmem_toc = (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE);
164 cbmem_toc = bss_cbmem_toc;
167 if (cbmem_toc == NULL)
170 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
171 if (cbmem_toc[i].id == id)
172 return (void *)(unsigned long)cbmem_toc[i].base;
179 void cbmem_arch_init(void);
180 #if CONFIG_HAVE_ACPI_RESUME
181 extern u8 acpi_slp_type;
183 extern uint64_t high_tables_base, high_tables_size;
185 void cbmem_initialize(void)
187 #if CONFIG_HAVE_ACPI_RESUME
188 if (acpi_slp_type == 3) {
189 if (!cbmem_reinit(high_tables_base)) {
190 /* Something went wrong, our high memory area got wiped */
192 cbmem_init(high_tables_base, high_tables_size);
195 cbmem_init(high_tables_base, high_tables_size);
198 cbmem_init(high_tables_base, high_tables_size);
204 void cbmem_list(void)
206 struct cbmem_entry *cbmem_toc;
209 cbmem_toc = (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE);
211 cbmem_toc = bss_cbmem_toc;
214 if (cbmem_toc == NULL)
217 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
219 if (cbmem_toc[i].magic != CBMEM_MAGIC)
221 printk_debug("%2d. ", i);
222 switch (cbmem_toc[i].id) {
223 case CBMEM_ID_FREESPACE: printk_debug("FREE SPACE "); break;
224 case CBMEM_ID_GDT: printk_debug("GDT "); break;
225 case CBMEM_ID_ACPI: printk_debug("ACPI "); break;
226 case CBMEM_ID_CBTABLE: printk_debug("COREBOOT "); break;
227 case CBMEM_ID_PIRQ: printk_debug("IRQ TABLE "); break;
228 case CBMEM_ID_MPTABLE: printk_debug("SMP TABLE "); break;
229 case CBMEM_ID_RESUME: printk_debug("ACPI RESUME"); break;
230 default: printk_debug("%08x ", cbmem_toc[i].id);
232 printk_debug("%08llx ", cbmem_toc[i].base);
233 printk_debug("%08llx\n", cbmem_toc[i].size);