source: trunk/payloads/libpayload/arch/i386/coreboot.c

Last change on this file was 5295, checked in by stepan, 5 years ago

Add coreboot framebuffer support to libpayload

Signed-off-by: Stefan Reinauer <stepan@…>
Acked-by: Patrick Georgi <patrick.georgi@…>

File size: 5.4 KB
Line 
1/*
2 * This file is part of the libpayload project.
3 *
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
5 * Copyright (C) 2009 coresystems GmbH
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <libpayload-config.h>
32#include <libpayload.h>
33#include <coreboot_tables.h>
34
35/*
36 * Some of this is x86 specific, and the rest of it is generic. Right now,
37 * since we only support x86, we'll avoid trying to make lots of infrastructure
38 * we don't need. If in the future, we want to use coreboot on some other
39 * architecture, then take out the generic parsing code and move it elsewhere.
40 */
41
42/* === Parsing code === */
43/* This is the generic parsing code. */
44
45static void cb_parse_memory(unsigned char *ptr, struct sysinfo_t *info)
46{
47        struct cb_memory *mem = (struct cb_memory *)ptr;
48        int count = MEM_RANGE_COUNT(mem);
49        int i;
50
51        if (count > SYSINFO_MAX_MEM_RANGES)
52                count = SYSINFO_MAX_MEM_RANGES;
53
54        info->n_memranges = 0;
55
56        for (i = 0; i < count; i++) {
57                struct cb_memory_range *range =
58                    (struct cb_memory_range *)MEM_RANGE_PTR(mem, i);
59
60#if MEMMAP_RAM_ONLY
61                if (range->type != CB_MEM_RAM)
62                        continue;
63#endif
64
65                info->memrange[info->n_memranges].base =
66                    UNPACK_CB64(range->start);
67
68                info->memrange[info->n_memranges].size =
69                    UNPACK_CB64(range->size);
70
71                info->memrange[info->n_memranges].type = range->type;
72
73                info->n_memranges++;
74        }
75}
76
77static void cb_parse_serial(unsigned char *ptr, struct sysinfo_t *info)
78{
79        struct cb_serial *ser = (struct cb_serial *)ptr;
80        info->ser_ioport = ser->ioport;
81}
82
83#ifdef CONFIG_NVRAM
84static void cb_parse_optiontable(unsigned char *ptr, struct sysinfo_t *info)
85{
86        info->option_table = (struct cb_cmos_option_table *)ptr;
87}
88
89static void cb_parse_checksum(unsigned char *ptr, struct sysinfo_t *info)
90{
91        struct cb_cmos_checksum *cmos_cksum = (struct cb_cmos_checksum *)ptr;
92        info->cmos_range_start = cmos_cksum->range_start;
93        info->cmos_range_end = cmos_cksum->range_end;
94        info->cmos_checksum_location = cmos_cksum->location;
95}
96#endif
97
98#ifdef CONFIG_COREBOOT_VIDEO_CONSOLE
99static void cb_parse_framebuffer(unsigned char *ptr, struct sysinfo_t *info)
100{
101        info->framebuffer = (struct cb_framebuffer *)ptr;
102}
103#endif
104
105static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
106{
107        struct cb_header *header;
108        unsigned char *ptr = (unsigned char *)addr;
109        int i;
110
111        for (i = 0; i < len; i += 16, ptr += 16) {
112                header = (struct cb_header *)ptr;
113                if (!strncmp((const char *)header->signature, "LBIO", 4))
114                        break;
115        }
116
117        /* We walked the entire space and didn't find anything. */
118        if (i >= len)
119                return -1;
120
121        if (!header->table_bytes)
122                return 0;
123
124        /* Make sure the checksums match. */
125        if (ipchksum((u16 *) header, sizeof(*header)) != 0)
126                return -1;
127
128        if (ipchksum((u16 *) (ptr + sizeof(*header)),
129                     header->table_bytes) != header->table_checksum)
130                return -1;
131
132        /* Now, walk the tables. */
133        ptr += header->header_bytes;
134
135        for (i = 0; i < header->table_entries; i++) {
136                struct cb_record *rec = (struct cb_record *)ptr;
137
138                /* We only care about a few tags here (maybe more later). */
139                switch (rec->tag) {
140                case CB_TAG_FORWARD:
141                        return cb_parse_header((void *)(unsigned long)((struct cb_forward *)rec)->forward, len, info);
142                        continue;
143                case CB_TAG_MEMORY:
144                        cb_parse_memory(ptr, info);
145                        break;
146                case CB_TAG_SERIAL:
147                        cb_parse_serial(ptr, info);
148                        break;
149#ifdef CONFIG_NVRAM
150                case CB_TAG_CMOS_OPTION_TABLE:
151                        cb_parse_optiontable(ptr, info);
152                        break;
153                case CB_TAG_OPTION_CHECKSUM:
154                        cb_parse_checksum(ptr, info);
155                        break;
156#endif
157#ifdef CONFIG_COREBOOT_VIDEO_CONSOLE
158                // FIXME we should warn on serial if coreboot set up a
159                // framebuffer buf the payload does not know about it.
160                case CB_TAG_FRAMEBUFFER:
161                        cb_parse_framebuffer(ptr, info);
162                        break;
163#endif
164                }
165
166                ptr += rec->size;
167        }
168
169        return 1;
170}
171
172/* == Architecture specific == */
173/* This is the x86 specific stuff. */
174
175int get_coreboot_info(struct sysinfo_t *info)
176{
177        int ret = cb_parse_header(phys_to_virt(0x00000000), 0x1000, info);
178
179        if (ret != 1)
180                ret = cb_parse_header(phys_to_virt(0x000f0000), 0x1000, info);
181
182        return (ret == 1) ? 0 : -1;
183}
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