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 * SPDX-License-Identifier: BSD-3-Clause 8 */ 9 10 #include <common.h> 11 #include <asm/arch-coreboot/ipchecksum.h> 12 #include <asm/arch-coreboot/sysinfo.h> 13 #include <asm/arch-coreboot/tables.h> 14 15 /* 16 * This needs to be in the .data section so that it's copied over during 17 * relocation. By default it's put in the .bss section which is simply filled 18 * with zeroes when transitioning from "ROM", which is really RAM, to other 19 * RAM. 20 */ 21 struct sysinfo_t lib_sysinfo __attribute__((section(".data"))); 22 23 /* 24 * Some of this is x86 specific, and the rest of it is generic. Right now, 25 * since we only support x86, we'll avoid trying to make lots of infrastructure 26 * we don't need. If in the future, we want to use coreboot on some other 27 * architecture, then take out the generic parsing code and move it elsewhere. 28 */ 29 30 /* === Parsing code === */ 31 /* This is the generic parsing code. */ 32 33 static void cb_parse_memory(unsigned char *ptr, struct sysinfo_t *info) 34 { 35 struct cb_memory *mem = (struct cb_memory *)ptr; 36 int count = MEM_RANGE_COUNT(mem); 37 int i; 38 39 if (count > SYSINFO_MAX_MEM_RANGES) 40 count = SYSINFO_MAX_MEM_RANGES; 41 42 info->n_memranges = 0; 43 44 for (i = 0; i < count; i++) { 45 struct cb_memory_range *range = 46 (struct cb_memory_range *)MEM_RANGE_PTR(mem, i); 47 48 info->memrange[info->n_memranges].base = 49 UNPACK_CB64(range->start); 50 51 info->memrange[info->n_memranges].size = 52 UNPACK_CB64(range->size); 53 54 info->memrange[info->n_memranges].type = range->type; 55 56 info->n_memranges++; 57 } 58 } 59 60 static void cb_parse_serial(unsigned char *ptr, struct sysinfo_t *info) 61 { 62 struct cb_serial *ser = (struct cb_serial *)ptr; 63 info->serial = ser; 64 } 65 66 static void cb_parse_vbnv(unsigned char *ptr, struct sysinfo_t *info) 67 { 68 struct cb_vbnv *vbnv = (struct cb_vbnv *)ptr; 69 70 info->vbnv_start = vbnv->vbnv_start; 71 info->vbnv_size = vbnv->vbnv_size; 72 } 73 74 static void cb_parse_gpios(unsigned char *ptr, struct sysinfo_t *info) 75 { 76 int i; 77 struct cb_gpios *gpios = (struct cb_gpios *)ptr; 78 79 info->num_gpios = (gpios->count < SYSINFO_MAX_GPIOS) ? 80 (gpios->count) : SYSINFO_MAX_GPIOS; 81 82 for (i = 0; i < info->num_gpios; i++) 83 info->gpios[i] = gpios->gpios[i]; 84 } 85 86 static void cb_parse_vdat(unsigned char *ptr, struct sysinfo_t *info) 87 { 88 struct cb_vdat *vdat = (struct cb_vdat *) ptr; 89 90 info->vdat_addr = vdat->vdat_addr; 91 info->vdat_size = vdat->vdat_size; 92 } 93 94 static void cb_parse_tstamp(unsigned char *ptr, struct sysinfo_t *info) 95 { 96 info->tstamp_table = ((struct cb_cbmem_tab *)ptr)->cbmem_tab; 97 } 98 99 static void cb_parse_cbmem_cons(unsigned char *ptr, struct sysinfo_t *info) 100 { 101 info->cbmem_cons = ((struct cb_cbmem_tab *)ptr)->cbmem_tab; 102 } 103 104 static void cb_parse_framebuffer(unsigned char *ptr, struct sysinfo_t *info) 105 { 106 info->framebuffer = (struct cb_framebuffer *)ptr; 107 } 108 109 static void cb_parse_string(unsigned char *ptr, char **info) 110 { 111 *info = (char *)((struct cb_string *)ptr)->string; 112 } 113 114 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info) 115 { 116 struct cb_header *header; 117 unsigned char *ptr = (unsigned char *)addr; 118 int i; 119 120 for (i = 0; i < len; i += 16, ptr += 16) { 121 header = (struct cb_header *)ptr; 122 if (!strncmp((const char *)header->signature, "LBIO", 4)) 123 break; 124 } 125 126 /* We walked the entire space and didn't find anything. */ 127 if (i >= len) 128 return -1; 129 130 if (!header->table_bytes) 131 return 0; 132 133 /* Make sure the checksums match. */ 134 if (ipchksum((u16 *) header, sizeof(*header)) != 0) 135 return -1; 136 137 if (ipchksum((u16 *) (ptr + sizeof(*header)), 138 header->table_bytes) != header->table_checksum) 139 return -1; 140 141 /* Now, walk the tables. */ 142 ptr += header->header_bytes; 143 144 /* Inintialize some fields to sentinel values. */ 145 info->vbnv_start = info->vbnv_size = (uint32_t)(-1); 146 147 for (i = 0; i < header->table_entries; i++) { 148 struct cb_record *rec = (struct cb_record *)ptr; 149 150 /* We only care about a few tags here (maybe more later). */ 151 switch (rec->tag) { 152 case CB_TAG_FORWARD: 153 return cb_parse_header( 154 (void *)(unsigned long) 155 ((struct cb_forward *)rec)->forward, 156 len, info); 157 continue; 158 case CB_TAG_MEMORY: 159 cb_parse_memory(ptr, info); 160 break; 161 case CB_TAG_SERIAL: 162 cb_parse_serial(ptr, info); 163 break; 164 case CB_TAG_VERSION: 165 cb_parse_string(ptr, &info->version); 166 break; 167 case CB_TAG_EXTRA_VERSION: 168 cb_parse_string(ptr, &info->extra_version); 169 break; 170 case CB_TAG_BUILD: 171 cb_parse_string(ptr, &info->build); 172 break; 173 case CB_TAG_COMPILE_TIME: 174 cb_parse_string(ptr, &info->compile_time); 175 break; 176 case CB_TAG_COMPILE_BY: 177 cb_parse_string(ptr, &info->compile_by); 178 break; 179 case CB_TAG_COMPILE_HOST: 180 cb_parse_string(ptr, &info->compile_host); 181 break; 182 case CB_TAG_COMPILE_DOMAIN: 183 cb_parse_string(ptr, &info->compile_domain); 184 break; 185 case CB_TAG_COMPILER: 186 cb_parse_string(ptr, &info->compiler); 187 break; 188 case CB_TAG_LINKER: 189 cb_parse_string(ptr, &info->linker); 190 break; 191 case CB_TAG_ASSEMBLER: 192 cb_parse_string(ptr, &info->assembler); 193 break; 194 /* 195 * FIXME we should warn on serial if coreboot set up a 196 * framebuffer buf the payload does not know about it. 197 */ 198 case CB_TAG_FRAMEBUFFER: 199 cb_parse_framebuffer(ptr, info); 200 break; 201 case CB_TAG_GPIO: 202 cb_parse_gpios(ptr, info); 203 break; 204 case CB_TAG_VDAT: 205 cb_parse_vdat(ptr, info); 206 break; 207 case CB_TAG_TIMESTAMPS: 208 cb_parse_tstamp(ptr, info); 209 break; 210 case CB_TAG_CBMEM_CONSOLE: 211 cb_parse_cbmem_cons(ptr, info); 212 break; 213 case CB_TAG_VBNV: 214 cb_parse_vbnv(ptr, info); 215 break; 216 } 217 218 ptr += rec->size; 219 } 220 221 return 1; 222 } 223 224 /* == Architecture specific == */ 225 /* This is the x86 specific stuff. */ 226 227 int get_coreboot_info(struct sysinfo_t *info) 228 { 229 int ret = cb_parse_header((void *)0x00000000, 0x1000, info); 230 231 if (ret != 1) 232 ret = cb_parse_header((void *)0x000f0000, 0x1000, info); 233 234 return (ret == 1) ? 0 : -1; 235 } 236