1 /*
2 * HVM SeaBIOS support.
3 *
4 * Leendert van Doorn, leendert@watson.ibm.com
5 * Copyright (c) 2005, International Business Machines Corporation.
6 * Copyright (c) 2006, Keir Fraser, XenSource Inc.
7 * Copyright (c) 2011, Citrix Inc.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms and conditions of the GNU General Public License,
11 * version 2, as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "config.h"
23 #include "config-seabios.h"
24
25 #include "util.h"
26
27 #include "smbios_types.h"
28
29 #include <acpi2_0.h>
30 #include <libacpi.h>
31
32 struct seabios_info {
33 char signature[14]; /* XenHVMSeaBIOS\0 */
34 uint8_t length; /* Length of this struct */
35 uint8_t checksum; /* Set such that the sum over bytes 0..length == 0 */
36 /*
37 * Physical address of an array of tables_nr elements.
38 *
39 * Each element is a 32 bit value contianing the physical address
40 * of a BIOS table.
41 */
42 uint32_t tables;
43 uint32_t tables_nr;
44 /*
45 * Physical address of the e820 table, contains e820_nr entries.
46 */
47 uint32_t e820;
48 uint32_t e820_nr;
49 } __attribute__ ((packed));
50
51 #define MAX_TABLES 4
52
seabios_setup_bios_info(void)53 static void seabios_setup_bios_info(void)
54 {
55 struct seabios_info *info = (void *)BIOS_INFO_PHYSICAL_ADDRESS;
56
57 *info = (struct seabios_info) {
58 .signature = "XenHVMSeaBIOS",
59 .length = sizeof(*info)
60 };
61
62 info->tables = (uint32_t)scratch_alloc(MAX_TABLES*sizeof(uint32_t), 0);
63 }
64
seabios_finish_bios_info(void)65 static void seabios_finish_bios_info(void)
66 {
67 struct seabios_info *info = (void *)BIOS_INFO_PHYSICAL_ADDRESS;
68 uint32_t i;
69 uint8_t checksum;
70
71 checksum = 0;
72 for ( i = 0; i < info->length; i++ )
73 checksum += ((uint8_t *)(info))[i];
74
75 info->checksum = -checksum;
76 }
77
add_table(uint32_t t)78 static void add_table(uint32_t t)
79 {
80 struct seabios_info *info = (void *)BIOS_INFO_PHYSICAL_ADDRESS;
81 uint32_t *ts = (uint32_t *)info->tables;
82
83 ASSERT(info->tables_nr < MAX_TABLES);
84
85 ts[info->tables_nr] = t;
86 info->tables_nr++;
87 }
88
seabios_acpi_build_tables(void)89 static void seabios_acpi_build_tables(void)
90 {
91 uint32_t rsdp = (uint32_t)scratch_alloc(sizeof(struct acpi_20_rsdp), 0);
92 struct acpi_config config = {
93 .dsdt_anycpu = dsdt_anycpu_qemu_xen,
94 .dsdt_anycpu_len = dsdt_anycpu_qemu_xen_len,
95 .dsdt_15cpu = NULL,
96 .dsdt_15cpu_len = 0,
97 };
98
99 hvmloader_acpi_build_tables(&config, rsdp);
100 add_table(rsdp);
101 }
102
seabios_create_mp_tables(void)103 static void seabios_create_mp_tables(void)
104 {
105 add_table(create_mp_tables(NULL));
106 }
107
seabios_create_smbios_tables(void)108 static void seabios_create_smbios_tables(void)
109 {
110 uint32_t ep = (uint32_t)scratch_alloc(sizeof(struct smbios_entry_point), 0);
111 hvm_write_smbios_tables(ep, 0UL, 0UL);
112 add_table(ep);
113 }
114
seabios_create_pir_tables(void)115 static void seabios_create_pir_tables(void)
116 {
117 add_table(create_pir_tables());
118 }
119
seabios_setup_e820(void)120 static void seabios_setup_e820(void)
121 {
122 struct seabios_info *info = (void *)BIOS_INFO_PHYSICAL_ADDRESS;
123 struct e820entry *e820 = scratch_alloc(sizeof(struct e820entry)*16, 0);
124 info->e820 = (uint32_t)e820;
125
126 /* Upper boundary already checked by seabios_load(). */
127 BUG_ON(seabios_config.bios_address < 0x000c0000);
128 /* SeaBIOS reserves memory in e820 as necessary so no low reservation. */
129 info->e820_nr = build_e820_table(e820, 0, seabios_config.bios_address);
130 dump_e820_table(e820, info->e820_nr);
131 }
132
seabios_load(const struct bios_config * bios,void * bios_addr,uint32_t bios_length)133 static void seabios_load(const struct bios_config *bios,
134 void *bios_addr, uint32_t bios_length)
135 {
136 unsigned int bios_dest = 0x100000 - bios_length;
137
138 BUG_ON(bios_dest + bios_length > HVMLOADER_PHYSICAL_ADDRESS);
139 memcpy((void *)bios_dest, bios_addr, bios_length);
140 seabios_config.bios_address = bios_dest;
141 seabios_config.image_size = bios_length;
142 }
143
144 struct bios_config seabios_config = {
145 .name = "SeaBIOS",
146
147 .load_roms = NULL,
148
149 .bios_load = seabios_load,
150
151 .bios_info_setup = seabios_setup_bios_info,
152 .bios_info_finish = seabios_finish_bios_info,
153
154 .e820_setup = seabios_setup_e820,
155
156 .acpi_build_tables = seabios_acpi_build_tables,
157 .create_mp_tables = seabios_create_mp_tables,
158 .create_smbios_tables = seabios_create_smbios_tables,
159 .create_pir_tables = seabios_create_pir_tables,
160 };
161
162 /*
163 * Local variables:
164 * mode: C
165 * c-file-style: "BSD"
166 * c-basic-offset: 4
167 * tab-width: 4
168 * indent-tabs-mode: nil
169 * End:
170 */
171