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(BIOS_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
43 } __attribute__((packed));
46 struct cbmem_entry *bss_cbmem_toc;
47 #define get_cbmem_toc() bss_cbmem_toc
49 #define get_cbmem_toc() (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE)
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", (unsigned long)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;
105 cbmem_toc = get_cbmem_toc();
107 if (cbmem_toc == NULL) {
111 if (cbmem_toc[0].magic != CBMEM_MAGIC) {
112 printk(BIOS_ERR, "ERROR: CBMEM was not initialized yet.\n");
116 /* Will the entry fit at all? */
117 if (size > cbmem_toc[0].size) {
118 printk(BIOS_ERR, "ERROR: Not enough memory for table %x\n", id);
122 /* Align size to 512 byte blocks */
124 size = ALIGN(size, 512) < cbmem_toc[0].size ?
125 ALIGN(size, 512) : cbmem_toc[0].size;
127 /* Now look for the first free/usable TOC entry */
128 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
129 if (cbmem_toc[i].id == CBMEM_ID_NONE)
133 if (i >= MAX_CBMEM_ENTRIES) {
134 printk(BIOS_ERR, "ERROR: No more CBMEM entries available.\n");
138 debug("Adding CBMEM entry as no. %d\n", i);
140 cbmem_toc[i] = (struct cbmem_entry) {
141 .magic = CBMEM_MAGIC,
143 .base = cbmem_toc[0].base,
147 cbmem_toc[0].base += size;
148 cbmem_toc[0].size -= size;
150 return (void *)(u32)cbmem_toc[i].base;
153 void *cbmem_find(u32 id)
155 struct cbmem_entry *cbmem_toc;
157 cbmem_toc = get_cbmem_toc();
159 if (cbmem_toc == NULL)
162 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
163 if (cbmem_toc[i].id == id)
164 return (void *)(unsigned long)cbmem_toc[i].base;
171 #if CONFIG_HAVE_ACPI_RESUME
172 extern u8 acpi_slp_type;
174 extern uint64_t high_tables_base, high_tables_size;
176 void cbmem_initialize(void)
178 #if CONFIG_HAVE_ACPI_RESUME
179 if (acpi_slp_type == 3) {
180 if (!cbmem_reinit(high_tables_base)) {
181 /* Something went wrong, our high memory area got wiped */
183 cbmem_init(high_tables_base, high_tables_size);
186 cbmem_init(high_tables_base, high_tables_size);
189 cbmem_init(high_tables_base, high_tables_size);
195 void cbmem_list(void)
197 struct cbmem_entry *cbmem_toc;
199 cbmem_toc = get_cbmem_toc();
201 if (cbmem_toc == NULL)
204 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
206 if (cbmem_toc[i].magic != CBMEM_MAGIC)
208 printk(BIOS_DEBUG, "%2d. ", i);
209 switch (cbmem_toc[i].id) {
210 case CBMEM_ID_FREESPACE: printk(BIOS_DEBUG, "FREE SPACE "); break;
211 case CBMEM_ID_GDT: printk(BIOS_DEBUG, "GDT "); break;
212 case CBMEM_ID_ACPI: printk(BIOS_DEBUG, "ACPI "); break;
213 case CBMEM_ID_CBTABLE: printk(BIOS_DEBUG, "COREBOOT "); break;
214 case CBMEM_ID_PIRQ: printk(BIOS_DEBUG, "IRQ TABLE "); break;
215 case CBMEM_ID_MPTABLE: printk(BIOS_DEBUG, "SMP TABLE "); break;
216 case CBMEM_ID_RESUME: printk(BIOS_DEBUG, "ACPI RESUME"); break;
217 default: printk(BIOS_DEBUG, "%08x ", cbmem_toc[i].id);
219 printk(BIOS_DEBUG, "%08llx ", cbmem_toc[i].base);
220 printk(BIOS_DEBUG, "%08llx\n", cbmem_toc[i].size);