1 // Coreboot interface support.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
5 // This file may be distributed under the terms of the GNU LGPLv3 license.
7 #include "memmap.h" // add_e820
8 #include "util.h" // dprintf
9 #include "pci.h" // struct pir_header
10 #include "acpi.h" // struct rsdp_descriptor
11 #include "mptable.h" // MPTABLE_SIGNATURE
12 #include "biosvar.h" // GET_EBDA
15 /****************************************************************
17 ****************************************************************/
22 struct pir_header *p = pos;
23 if (p->signature != PIR_SIGNATURE)
27 if (p->size < sizeof(*p))
29 if (checksum(pos, p->size) != 0)
31 bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
32 if (bios_table_cur_addr + p->size > bios_table_end_addr) {
33 dprintf(1, "No room to copy PIR table!\n");
36 dprintf(1, "Copying PIR from %p to %x\n", pos, bios_table_cur_addr);
37 memcpy((void*)bios_table_cur_addr, pos, p->size);
38 PirOffset = bios_table_cur_addr - BUILD_BIOS_ADDR;
39 bios_table_cur_addr += p->size;
43 copy_mptable(void *pos)
45 struct mptable_floating_s *p = pos;
46 if (p->signature != MPTABLE_SIGNATURE)
50 if (checksum(pos, sizeof(*p)) != 0)
52 u32 length = p->length * 16;
53 bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
54 u16 mpclength = ((struct mptable_config_s *)p->physaddr)->length;
55 if (bios_table_cur_addr + length + mpclength > bios_table_end_addr) {
56 dprintf(1, "No room to copy MPTABLE!\n");
59 dprintf(1, "Copying MPTABLE from %p/%x to %x\n"
60 , pos, p->physaddr, bios_table_cur_addr);
61 memcpy((void*)bios_table_cur_addr, pos, length);
62 struct mptable_floating_s *newp = (void*)bios_table_cur_addr;
63 newp->physaddr = bios_table_cur_addr + length;
65 newp->checksum = -checksum(newp, sizeof(*newp));
66 memcpy((void*)bios_table_cur_addr + length, (void*)p->physaddr, mpclength);
67 bios_table_cur_addr += length + mpclength;
71 copy_acpi_rsdp(void *pos)
75 struct rsdp_descriptor *p = pos;
76 if (p->signature != RSDP_SIGNATURE)
79 if (checksum(pos, length) != 0)
81 if (p->revision > 1) {
83 if (checksum(pos, length) != 0)
86 bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
87 if (bios_table_cur_addr + length > bios_table_end_addr) {
88 dprintf(1, "No room to copy ACPI RSDP table!\n");
91 dprintf(1, "Copying ACPI RSDP from %p to %x\n", pos, bios_table_cur_addr);
92 RsdpAddr = (void*)bios_table_cur_addr;
93 memcpy(RsdpAddr, pos, length);
94 bios_table_cur_addr += length;
97 // Attempt to find (and relocate) any standard bios tables found in a
98 // given address range.
100 scan_tables(u32 start, u32 size)
102 void *p = (void*)ALIGN(start, 16);
103 void *end = (void*)start + size;
104 for (; p<end; p += 16) {
112 /****************************************************************
114 ****************************************************************/
125 #define CB_SIGNATURE 0x4f49424C // "LBIO"
127 struct cb_memory_range {
133 #define CB_MEM_TABLE 16
138 struct cb_memory_range map[0];
141 #define CB_TAG_MEMORY 0x01
143 #define MEM_RANGE_COUNT(_rec) \
144 (((_rec)->size - sizeof(*(_rec))) / sizeof((_rec)->map[0]))
147 ipchksum(char *buf, int count)
157 sum = (sum >> 16) + (sum & 0xffff);
162 // Try to locate the coreboot header in a given address range.
163 static struct cb_header *
164 find_cb_header(char *addr, int len)
166 char *end = addr + len;
167 for (; addr < end; addr += 16) {
168 struct cb_header *cbh = (struct cb_header *)addr;
169 if (cbh->signature != CB_SIGNATURE)
171 if (! cbh->table_bytes)
173 if (ipchksum(addr, sizeof(*cbh)) != 0)
175 if (ipchksum(addr + sizeof(*cbh), cbh->table_bytes)
176 != cbh->table_checksum)
183 // Try to find the coreboot memory table in the given coreboot table.
185 find_cb_subtable(struct cb_header *cbh, u32 tag)
187 char *tbl = (char *)cbh + sizeof(*cbh);
189 for (i=0; i<cbh->table_entries; i++) {
190 struct cb_memory *cbm = (struct cb_memory *)tbl;
198 // Populate max ram and e820 map info by scanning for a coreboot table.
202 dprintf(3, "Attempting to find coreboot table\n");
204 // Init variables set in coreboot table memory scan.
208 // Find coreboot table.
209 struct cb_header *cbh = find_cb_header(0, 0x1000);
212 struct cb_memory *cbm = find_cb_subtable(cbh, CB_TAG_MEMORY);
216 u64 maxram = 0, maxram_over4G = 0;
217 int i, count = MEM_RANGE_COUNT(cbm);
218 for (i=0; i<count; i++) {
219 struct cb_memory_range *m = &cbm->map[i];
221 if (type == CB_MEM_TABLE) {
222 type = E820_RESERVED;
223 scan_tables(m->start, m->size);
224 } else if (type == E820_ACPI || type == E820_RAM) {
225 u64 end = m->start + m->size;
226 if (end > 0x100000000ull) {
227 end -= 0x100000000ull;
228 if (end > maxram_over4G)
230 } else if (end > maxram)
233 add_e820(m->start, m->size, type);
237 RamSizeOver4G = maxram_over4G;
239 // Ughh - coreboot likes to set a map at 0x0000-0x1000, but this
240 // confuses grub. So, override it.
241 add_e820(0, 16*1024, E820_RAM);
243 // XXX - just create dummy smbios table for now - should detect if
244 // smbios/dmi table is found from coreboot and use that instead.
250 // No table found.. Use 16Megs as a dummy value.
251 dprintf(1, "Unable to find coreboot table!\n");
252 RamSize = 16*1024*1024;
254 add_e820(0, 16*1024*1024, E820_RAM);