1 // Paravirtualization support.
3 // Copyright (C) 2009 Red Hat Inc.
6 // Gleb Natapov <gnatapov@redhat.com>
8 // This file may be distributed under the terms of the GNU LGPLv3 license.
10 #include "config.h" // CONFIG_COREBOOT
11 #include "util.h" // ntoh[ls]
12 #include "ioport.h" // outw
13 #include "paravirt.h" // qemu_cfg_port_probe
14 #include "smbios.h" // struct smbios_structure_header
19 qemu_cfg_select(u16 f)
21 outw(f, PORT_QEMU_CFG_CTL);
25 qemu_cfg_read(u8 *buf, int len)
28 *(buf++) = inb(PORT_QEMU_CFG_DATA);
32 qemu_cfg_skip(int len)
35 inb(PORT_QEMU_CFG_DATA);
39 qemu_cfg_read_entry(void *buf, int e, int len)
42 qemu_cfg_read(buf, len);
45 void qemu_cfg_port_probe(void)
55 qemu_cfg_select(QEMU_CFG_SIGNATURE);
57 for (i = 0; i < 4; i++)
58 if (inb(PORT_QEMU_CFG_DATA) != sig[i]) {
62 dprintf(4, "qemu_cfg_present=%d\n", qemu_cfg_present);
65 void qemu_cfg_get_uuid(u8 *uuid)
67 if (!qemu_cfg_present)
70 qemu_cfg_read_entry(uuid, QEMU_CFG_UUID, 16);
73 int qemu_cfg_show_boot_menu(void)
76 if (!qemu_cfg_present)
79 qemu_cfg_read_entry(&v, QEMU_CFG_BOOT_MENU, sizeof(v));
84 int qemu_cfg_irq0_override(void)
88 if (!qemu_cfg_present)
91 qemu_cfg_read_entry(&v, QEMU_CFG_IRQ0_OVERRIDE, sizeof(v));
96 u16 qemu_cfg_acpi_additional_tables(void)
100 if (!qemu_cfg_present)
103 qemu_cfg_read_entry(&cnt, QEMU_CFG_ACPI_TABLES, sizeof(cnt));
108 u16 qemu_cfg_next_acpi_table_len(void)
112 qemu_cfg_read((u8*)&len, sizeof(len));
117 void* qemu_cfg_next_acpi_table_load(void *addr, u16 len)
119 qemu_cfg_read(addr, len);
123 u16 qemu_cfg_smbios_entries(void)
127 if (!qemu_cfg_present)
130 qemu_cfg_read_entry(&cnt, QEMU_CFG_SMBIOS_ENTRIES, sizeof(cnt));
135 u32 qemu_cfg_e820_entries(void)
139 if (!qemu_cfg_present)
142 qemu_cfg_read_entry(&cnt, QEMU_CFG_E820_TABLE, sizeof(cnt));
146 void* qemu_cfg_e820_load_next(void *addr)
148 qemu_cfg_read(addr, sizeof(struct e820_reservation));
152 struct smbios_header {
157 struct smbios_field {
158 struct smbios_header header;
164 struct smbios_table {
165 struct smbios_header header;
169 #define SMBIOS_FIELD_ENTRY 0
170 #define SMBIOS_TABLE_ENTRY 1
172 size_t qemu_cfg_smbios_load_field(int type, size_t offset, void *addr)
176 for (i = qemu_cfg_smbios_entries(); i > 0; i--) {
177 struct smbios_field field;
179 qemu_cfg_read((u8 *)&field, sizeof(struct smbios_header));
180 field.header.length -= sizeof(struct smbios_header);
182 if (field.header.type != SMBIOS_FIELD_ENTRY) {
183 qemu_cfg_skip(field.header.length);
187 qemu_cfg_read((u8 *)&field.type,
188 sizeof(field) - sizeof(struct smbios_header));
189 field.header.length -= sizeof(field) - sizeof(struct smbios_header);
191 if (field.type != type || field.offset != offset) {
192 qemu_cfg_skip(field.header.length);
196 qemu_cfg_read(addr, field.header.length);
197 return (size_t)field.header.length;
202 int qemu_cfg_smbios_load_external(int type, char **p, unsigned *nr_structs,
203 unsigned *max_struct_size, char *end)
205 static u64 used_bitmap[4] = { 0 };
209 /* Check if we've already reported these tables */
210 if (used_bitmap[(type >> 6) & 0x3] & (1ULL << (type & 0x3f)))
213 /* Don't introduce spurious end markers */
217 for (i = qemu_cfg_smbios_entries(); i > 0; i--) {
218 struct smbios_table table;
219 struct smbios_structure_header *header = (void *)*p;
222 qemu_cfg_read((u8 *)&table, sizeof(struct smbios_header));
223 table.header.length -= sizeof(struct smbios_header);
225 if (table.header.type != SMBIOS_TABLE_ENTRY) {
226 qemu_cfg_skip(table.header.length);
230 if (end - *p < sizeof(struct smbios_structure_header)) {
235 qemu_cfg_read((u8 *)*p, sizeof(struct smbios_structure_header));
236 table.header.length -= sizeof(struct smbios_structure_header);
238 if (header->type != type) {
239 qemu_cfg_skip(table.header.length);
243 *p += sizeof(struct smbios_structure_header);
245 /* Entries end with a double NULL char, if there's a string at
246 * the end (length is greater than formatted length), the string
247 * terminator provides the first NULL. */
248 string = header->length < table.header.length +
249 sizeof(struct smbios_structure_header);
251 /* Read the rest and terminate the entry */
252 if (end - *p < table.header.length) {
254 *p -= sizeof(struct smbios_structure_header);
257 qemu_cfg_read((u8 *)*p, table.header.length);
258 *p += table.header.length;
267 if (*p - (char *)header > *max_struct_size)
268 *max_struct_size = *p - (char *)header;
272 /* Mark that we've reported on this type */
273 used_bitmap[(type >> 6) & 0x3] |= (1ULL << (type & 0x3f));
280 int qemu_cfg_get_numa_nodes(void)
284 qemu_cfg_read_entry(&cnt, QEMU_CFG_NUMA, sizeof(cnt));
289 void qemu_cfg_get_numa_data(u64 *data, int n)
293 for (i = 0; i < n; i++)
294 qemu_cfg_read((u8*)(data + i), sizeof(u64));
297 u16 qemu_cfg_get_max_cpus(void)
301 if (!qemu_cfg_present)
304 qemu_cfg_read_entry(&cnt, QEMU_CFG_MAX_CPUS, sizeof(cnt));
309 static QemuCfgFile LastFile;
312 __cfg_next_prefix_file(const char *prefix, int prefixlen, u32 prevselect)
314 if (!qemu_cfg_present)
318 qemu_cfg_read_entry(&count, QEMU_CFG_FILE_DIR, sizeof(count));
319 count = ntohl(count);
321 for (e = 0; e < count; e++) {
322 qemu_cfg_read((void*)&LastFile, sizeof(LastFile));
323 u32 select = ntohs(LastFile.select);
324 if (select <= prevselect)
326 if (memcmp(prefix, LastFile.name, prefixlen) == 0)
332 u32 qemu_cfg_next_prefix_file(const char *prefix, u32 prevselect)
334 return __cfg_next_prefix_file(prefix, strlen(prefix), prevselect);
337 u32 qemu_cfg_find_file(const char *name)
339 return __cfg_next_prefix_file(name, strlen(name) + 1, 0);
342 int qemu_cfg_read_file(u32 select, void *dst, u32 maxlen)
344 if (!qemu_cfg_present)
346 if (!select || select != ntohs(LastFile.select))
348 int len = ntohl(LastFile.size);
351 qemu_cfg_read_entry(dst, select, len);