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));
42 /* note this should be done as weak function but we do #include
43 of C files in the romstage breaking this (in same compile
44 unit is weak and non weak function
45 struct cbmem_entry *__attribute__((weak)) get_cbmem_toc(void)
48 #define get_cbmem_toc() (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE)
53 static struct cbmem_entry *bss_cbmem_toc;
55 struct cbmem_entry *__attribute__((weak)) get_cbmem_toc(void)
60 void __attribute__((weak)) set_cbmem_toc(struct cbmem_entry * x)
62 /* do nothing, this should be called by chipset to save TOC in NVRAM */
68 * cbmem is a simple mechanism to do some kind of book keeping of the coreboot
69 * high tables memory. This is a small amount of memory which is "stolen" from
70 * the system memory for coreboot purposes. Usually this memory is used for
71 * - the coreboot table
72 * - legacy tables (PIRQ, MP table)
74 * - suspend/resume backup memory
77 void cbmem_init(u64 baseaddr, u64 size)
79 struct cbmem_entry *cbmem_toc;
80 cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr;
83 bss_cbmem_toc = cbmem_toc;
86 printk(BIOS_DEBUG, "Initializing CBMEM area to 0x%llx (%lld bytes)\n",
89 if (size < (64 * 1024)) {
90 printk(BIOS_DEBUG, "Increase CBMEM size!\n");
94 /* we don't need to call this in romstage, usefull only from ramstage */
96 set_cbmem_toc((struct cbmem_entry *)(unsigned long)baseaddr);
98 memset(cbmem_toc, 0, CBMEM_TOC_RESERVED);
100 cbmem_toc[0] = (struct cbmem_entry) {
101 .magic = CBMEM_MAGIC,
102 .id = CBMEM_ID_FREESPACE,
103 .base = baseaddr + CBMEM_TOC_RESERVED,
104 .size = size - CBMEM_TOC_RESERVED
108 int cbmem_reinit(u64 baseaddr)
110 struct cbmem_entry *cbmem_toc;
111 cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr;
113 printk(BIOS_DEBUG, "Re-Initializing CBMEM area to 0x%lx\n",
114 (unsigned long)baseaddr);
117 bss_cbmem_toc = cbmem_toc;
120 return (cbmem_toc[0].magic == CBMEM_MAGIC);
123 void *cbmem_add(u32 id, u64 size)
125 struct cbmem_entry *cbmem_toc;
127 cbmem_toc = get_cbmem_toc();
129 if (cbmem_toc == NULL) {
133 if (cbmem_toc[0].magic != CBMEM_MAGIC) {
134 printk(BIOS_ERR, "ERROR: CBMEM was not initialized yet.\n");
138 /* Will the entry fit at all? */
139 if (size > cbmem_toc[0].size) {
140 printk(BIOS_ERR, "ERROR: Not enough memory for table %x\n", id);
144 /* Align size to 512 byte blocks */
146 size = ALIGN(size, 512) < cbmem_toc[0].size ?
147 ALIGN(size, 512) : cbmem_toc[0].size;
149 /* Now look for the first free/usable TOC entry */
150 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
151 if (cbmem_toc[i].id == CBMEM_ID_NONE)
155 if (i >= MAX_CBMEM_ENTRIES) {
156 printk(BIOS_ERR, "ERROR: No more CBMEM entries available.\n");
160 printk(BIOS_DEBUG, "Adding CBMEM entry as no. %d\n", i);
162 cbmem_toc[i] = (struct cbmem_entry) {
163 .magic = CBMEM_MAGIC,
165 .base = cbmem_toc[0].base,
169 cbmem_toc[0].base += size;
170 cbmem_toc[0].size -= size;
172 return (void *)(u32)cbmem_toc[i].base;
175 void *cbmem_find(u32 id)
177 struct cbmem_entry *cbmem_toc;
179 cbmem_toc = get_cbmem_toc();
181 if (cbmem_toc == NULL)
184 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
185 if (cbmem_toc[i].id == id)
186 return (void *)(unsigned long)cbmem_toc[i].base;
193 #if CONFIG_HAVE_ACPI_RESUME
194 extern u8 acpi_slp_type;
196 extern uint64_t high_tables_base, high_tables_size;
198 void cbmem_initialize(void)
200 #if CONFIG_HAVE_ACPI_RESUME
201 if (acpi_slp_type == 3) {
202 if (!cbmem_reinit(high_tables_base)) {
203 /* Something went wrong, our high memory area got wiped */
205 cbmem_init(high_tables_base, high_tables_size);
208 cbmem_init(high_tables_base, high_tables_size);
211 cbmem_init(high_tables_base, high_tables_size);
217 void cbmem_list(void)
219 struct cbmem_entry *cbmem_toc;
221 cbmem_toc = get_cbmem_toc();
223 if (cbmem_toc == NULL)
226 for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
228 if (cbmem_toc[i].magic != CBMEM_MAGIC)
230 printk(BIOS_DEBUG, "%2d. ", i);
231 switch (cbmem_toc[i].id) {
232 case CBMEM_ID_FREESPACE: printk(BIOS_DEBUG, "FREE SPACE "); break;
233 case CBMEM_ID_GDT: printk(BIOS_DEBUG, "GDT "); break;
234 case CBMEM_ID_ACPI: printk(BIOS_DEBUG, "ACPI "); break;
235 case CBMEM_ID_CBTABLE: printk(BIOS_DEBUG, "COREBOOT "); break;
236 case CBMEM_ID_PIRQ: printk(BIOS_DEBUG, "IRQ TABLE "); break;
237 case CBMEM_ID_MPTABLE: printk(BIOS_DEBUG, "SMP TABLE "); break;
238 case CBMEM_ID_RESUME: printk(BIOS_DEBUG, "ACPI RESUME"); break;
239 default: printk(BIOS_DEBUG, "%08x ", cbmem_toc[i].id);
241 printk(BIOS_DEBUG, "%08llx ", cbmem_toc[i].base);
242 printk(BIOS_DEBUG, "%08llx\n", cbmem_toc[i].size);