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.
17 qemu_cfg_select(u16 f)
19 outw(f, PORT_QEMU_CFG_CTL);
23 qemu_cfg_read(u8 *buf, int len)
26 *(buf++) = inb(PORT_QEMU_CFG_DATA);
30 qemu_cfg_skip(int len)
33 inb(PORT_QEMU_CFG_DATA);
37 qemu_cfg_read_entry(void *buf, int e, int len)
40 qemu_cfg_read(buf, len);
43 void qemu_cfg_port_probe(void)
53 qemu_cfg_select(QEMU_CFG_SIGNATURE);
55 for (i = 0; i < 4; i++)
56 if (inb(PORT_QEMU_CFG_DATA) != sig[i]) {
60 dprintf(4, "qemu_cfg_present=%d\n", qemu_cfg_present);
63 void qemu_cfg_get_uuid(u8 *uuid)
65 if (!qemu_cfg_present)
68 qemu_cfg_read_entry(uuid, QEMU_CFG_UUID, 16);
71 int qemu_cfg_show_boot_menu(void)
74 if (!qemu_cfg_present)
77 qemu_cfg_read_entry(&v, QEMU_CFG_BOOT_MENU, sizeof(v));
82 u16 qemu_cfg_acpi_additional_tables(void)
86 if (!qemu_cfg_present)
89 qemu_cfg_read_entry(&cnt, QEMU_CFG_ACPI_TABLES, sizeof(cnt));
94 u16 qemu_cfg_next_acpi_table_len(void)
98 qemu_cfg_read((u8*)&len, sizeof(len));
103 void* qemu_cfg_next_acpi_table_load(void *addr, u16 len)
105 qemu_cfg_read(addr, len);
109 u16 qemu_cfg_smbios_entries(void)
113 if (!qemu_cfg_present)
116 qemu_cfg_read_entry(&cnt, QEMU_CFG_SMBIOS_ENTRIES, sizeof(cnt));
121 struct smbios_header {
126 struct smbios_field {
127 struct smbios_header header;
133 struct smbios_table {
134 struct smbios_header header;
138 #define SMBIOS_FIELD_ENTRY 0
139 #define SMBIOS_TABLE_ENTRY 1
141 size_t qemu_cfg_smbios_load_field(int type, size_t offset, void *addr)
145 for (i = qemu_cfg_smbios_entries(); i > 0; i--) {
146 struct smbios_field field;
148 qemu_cfg_read((u8 *)&field, sizeof(struct smbios_header));
149 field.header.length -= sizeof(struct smbios_header);
151 if (field.header.type != SMBIOS_FIELD_ENTRY) {
152 qemu_cfg_skip(field.header.length);
156 qemu_cfg_read((u8 *)&field.type,
157 sizeof(field) - sizeof(struct smbios_header));
158 field.header.length -= sizeof(field) - sizeof(struct smbios_header);
160 if (field.type != type || field.offset != offset) {
161 qemu_cfg_skip(field.header.length);
165 qemu_cfg_read(addr, field.header.length);
166 return (size_t)field.header.length;
171 /* This goes at the beginning of every SMBIOS structure. */
172 struct smbios_structure_header {
178 int qemu_cfg_smbios_load_external(int type, char **p, unsigned *nr_structs,
179 unsigned *max_struct_size, char *end)
181 static u64 used_bitmap[4] = { 0 };
185 /* Check if we've already reported these tables */
186 if (used_bitmap[(type >> 6) & 0x3] & (1ULL << (type & 0x3f)))
189 /* Don't introduce spurious end markers */
193 for (i = qemu_cfg_smbios_entries(); i > 0; i--) {
194 struct smbios_table table;
195 struct smbios_structure_header *header = (void *)*p;
198 qemu_cfg_read((u8 *)&table, sizeof(struct smbios_header));
199 table.header.length -= sizeof(struct smbios_header);
201 if (table.header.type != SMBIOS_TABLE_ENTRY) {
202 qemu_cfg_skip(table.header.length);
206 if (end - *p < sizeof(struct smbios_structure_header)) {
207 dprintf(1, "No more memory for additional smbios tables\n");
211 qemu_cfg_read((u8 *)*p, sizeof(struct smbios_structure_header));
212 table.header.length -= sizeof(struct smbios_structure_header);
214 if (header->type != type) {
215 qemu_cfg_skip(table.header.length);
219 *p += sizeof(struct smbios_structure_header);
221 /* Entries end with a double NULL char, if there's a string at
222 * the end (length is greater than formatted length), the string
223 * terminator provides the first NULL. */
224 string = header->length < table.header.length +
225 sizeof(struct smbios_structure_header);
227 /* Read the rest and terminate the entry */
228 if (end - *p < table.header.length) {
229 dprintf(1, "No memory for smbios table %d\n", header->type);
230 *p -= sizeof(struct smbios_structure_header);
233 qemu_cfg_read((u8 *)*p, table.header.length);
234 *p += table.header.length;
243 if (*p - (char *)header > *max_struct_size)
244 *max_struct_size = *p - (char *)header;
248 /* Mark that we've reported on this type */
249 used_bitmap[(type >> 6) & 0x3] |= (1ULL << (type & 0x3f));