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Kevin O'Connor59a23bb2008-06-08 23:09:42 -04001// Coreboot interface support.
2//
3// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4//
Kevin O'Connorb1b7c2a2009-01-15 20:52:58 -05005// This file may be distributed under the terms of the GNU LGPLv3 license.
Kevin O'Connor59a23bb2008-06-08 23:09:42 -04006
7#include "memmap.h" // add_e820
8#include "util.h" // dprintf
Kevin O'Connor93479e42008-06-12 22:22:43 -04009#include "pci.h" // struct pir_header
10#include "acpi.h" // struct rsdp_descriptor
Kevin O'Connor9521e262008-07-04 13:04:29 -040011#include "biosvar.h" // GET_EBDA
Kevin O'Connor59a23bb2008-06-08 23:09:42 -040012
13
14/****************************************************************
Kevin O'Connor93479e42008-06-12 22:22:43 -040015 * BIOS table copying
16 ****************************************************************/
17
18static void
19copy_pir(void *pos)
20{
21 struct pir_header *p = pos;
22 if (p->signature != PIR_SIGNATURE)
23 return;
Kevin O'Connor51358db2008-12-28 21:50:29 -050024 if (PirOffset)
Kevin O'Connor93479e42008-06-12 22:22:43 -040025 return;
26 if (p->size < sizeof(*p))
27 return;
28 if (checksum(pos, p->size) != 0)
29 return;
30 bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
31 if (bios_table_cur_addr + p->size > bios_table_end_addr) {
32 dprintf(1, "No room to copy PIR table!\n");
33 return;
34 }
35 dprintf(1, "Copying PIR from %p to %x\n", pos, bios_table_cur_addr);
36 memcpy((void*)bios_table_cur_addr, pos, p->size);
Kevin O'Connor51358db2008-12-28 21:50:29 -050037 PirOffset = bios_table_cur_addr - BUILD_BIOS_ADDR;
Kevin O'Connor93479e42008-06-12 22:22:43 -040038 bios_table_cur_addr += p->size;
39}
40
Kevin O'Connore10e6f82008-06-21 19:46:43 -040041static void
42copy_mptable(void *pos)
43{
44 struct mptable_floating_s *p = pos;
45 if (p->signature != MPTABLE_SIGNAURE)
46 return;
47 if (!p->physaddr)
48 return;
49 if (checksum(pos, sizeof(*p)) != 0)
50 return;
51 u32 length = p->length * 16;
52 bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
53 if (bios_table_cur_addr + length > bios_table_end_addr) {
54 dprintf(1, "No room to copy MPTABLE!\n");
55 return;
56 }
57 dprintf(1, "Copying MPTABLE from %p to %x\n", pos, bios_table_cur_addr);
58 memcpy((void*)bios_table_cur_addr, pos, length);
Kevin O'Connore10e6f82008-06-21 19:46:43 -040059 bios_table_cur_addr += length;
60}
Kevin O'Connor93479e42008-06-12 22:22:43 -040061
62static void
63copy_acpi_rsdp(void *pos)
64{
Kevin O'Connor9967ab72008-12-18 21:57:33 -050065 if (RsdpAddr)
Kevin O'Connor93479e42008-06-12 22:22:43 -040066 return;
67 struct rsdp_descriptor *p = pos;
Kevin O'Connor9967ab72008-12-18 21:57:33 -050068 if (p->signature != RSDP_SIGNATURE)
69 return;
Kevin O'Connor93479e42008-06-12 22:22:43 -040070 u32 length = 20;
71 if (checksum(pos, length) != 0)
72 return;
73 if (p->revision > 1) {
74 length = p->length;
75 if (checksum(pos, length) != 0)
76 return;
77 }
78 bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
79 if (bios_table_cur_addr + length > bios_table_end_addr) {
80 dprintf(1, "No room to copy ACPI RSDP table!\n");
81 return;
82 }
83 dprintf(1, "Copying ACPI RSDP from %p to %x\n", pos, bios_table_cur_addr);
Kevin O'Connor9967ab72008-12-18 21:57:33 -050084 RsdpAddr = (void*)bios_table_cur_addr;
85 memcpy(RsdpAddr, pos, length);
Kevin O'Connor93479e42008-06-12 22:22:43 -040086 bios_table_cur_addr += length;
87}
88
89// Attempt to find (and relocate) any standard bios tables found in a
90// given address range.
Kevin O'Connor9521e262008-07-04 13:04:29 -040091static void
Kevin O'Connor93479e42008-06-12 22:22:43 -040092scan_tables(u32 start, u32 size)
93{
94 void *p = (void*)ALIGN(start, 16);
95 void *end = (void*)start + size;
96 for (; p<end; p += 16) {
97 copy_pir(p);
Kevin O'Connore10e6f82008-06-21 19:46:43 -040098 copy_mptable(p);
Kevin O'Connor93479e42008-06-12 22:22:43 -040099 copy_acpi_rsdp(p);
100 }
101}
102
103
104/****************************************************************
105 * Memory map
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400106 ****************************************************************/
107
108struct cb_header {
109 u32 signature;
110 u32 header_bytes;
111 u32 header_checksum;
112 u32 table_bytes;
113 u32 table_checksum;
114 u32 table_entries;
115};
116
117#define CB_SIGNATURE 0x4f49424C // "LBIO"
118
119struct cb_memory_range {
120 u64 start;
121 u64 size;
122 u32 type;
123};
124
125#define CB_MEM_TABLE 16
126
127struct cb_memory {
128 u32 tag;
129 u32 size;
130 struct cb_memory_range map[0];
131};
132
133#define CB_TAG_MEMORY 0x01
134
135#define MEM_RANGE_COUNT(_rec) \
136 (((_rec)->size - sizeof(*(_rec))) / sizeof((_rec)->map[0]))
137
138static u16
139ipchksum(char *buf, int count)
140{
141 u16 *p = (u16*)buf;
142 u32 sum = 0;
143 while (count > 1) {
144 sum += *p++;
145 count -= 2;
146 }
147 if (count)
148 sum += *(u8*)p;
149 sum = (sum >> 16) + (sum & 0xffff);
150 sum += (sum >> 16);
151 return ~sum;
152}
153
154// Try to locate the coreboot header in a given address range.
155static struct cb_header *
156find_cb_header(char *addr, int len)
157{
158 char *end = addr + len;
159 for (; addr < end; addr += 16) {
160 struct cb_header *cbh = (struct cb_header *)addr;
161 if (cbh->signature != CB_SIGNATURE)
162 continue;
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400163 if (! cbh->table_bytes)
164 continue;
165 if (ipchksum(addr, sizeof(*cbh)) != 0)
166 continue;
167 if (ipchksum(addr + sizeof(*cbh), cbh->table_bytes)
168 != cbh->table_checksum)
169 continue;
170 return cbh;
171 }
172 return NULL;
173}
174
175// Try to find the coreboot memory table in the given coreboot table.
Kevin O'Connor93479e42008-06-12 22:22:43 -0400176static void *
177find_cb_subtable(struct cb_header *cbh, u32 tag)
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400178{
179 char *tbl = (char *)cbh + sizeof(*cbh);
180 int i;
181 for (i=0; i<cbh->table_entries; i++) {
182 struct cb_memory *cbm = (struct cb_memory *)tbl;
183 tbl += cbm->size;
Kevin O'Connor93479e42008-06-12 22:22:43 -0400184 if (cbm->tag == tag)
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400185 return cbm;
186 }
187 return NULL;
188}
189
190// Populate max ram and e820 map info by scanning for a coreboot table.
191void
192coreboot_fill_map()
193{
194 dprintf(3, "Attempting to find coreboot table\n");
Kevin O'Connoref3d8822009-02-05 19:51:12 -0500195
196 // Init variables set in coreboot table memory scan.
197 PirOffset = 0;
198 RsdpAddr = 0;
199
200 // Find coreboot table.
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400201 struct cb_header *cbh = find_cb_header(0, 0x1000);
202 if (!cbh)
203 goto fail;
Kevin O'Connor93479e42008-06-12 22:22:43 -0400204 struct cb_memory *cbm = find_cb_subtable(cbh, CB_TAG_MEMORY);
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400205 if (!cbm)
206 goto fail;
207
Kevin O'Connor59c35f22008-10-25 23:05:42 -0400208 u64 maxram = 0, maxram_over4G = 0;
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400209 int i, count = MEM_RANGE_COUNT(cbm);
210 for (i=0; i<count; i++) {
211 struct cb_memory_range *m = &cbm->map[i];
212 u32 type = m->type;
Kevin O'Connor93479e42008-06-12 22:22:43 -0400213 if (type == CB_MEM_TABLE) {
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400214 type = E820_RESERVED;
Kevin O'Connor93479e42008-06-12 22:22:43 -0400215 scan_tables(m->start, m->size);
Kevin O'Connor59c35f22008-10-25 23:05:42 -0400216 } else if (type == E820_ACPI || type == E820_RAM) {
217 u64 end = m->start + m->size;
218 if (end > 0x100000000ull) {
219 end -= 0x100000000ull;
220 if (end > maxram_over4G)
221 maxram_over4G = end;
222 } else if (end > maxram)
223 maxram = end;
Kevin O'Connor93479e42008-06-12 22:22:43 -0400224 }
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400225 add_e820(m->start, m->size, type);
226 }
227
Kevin O'Connore7916362008-12-28 22:03:17 -0500228 RamSize = maxram;
229 RamSizeOver4G = maxram_over4G;
Kevin O'Connor59c35f22008-10-25 23:05:42 -0400230
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400231 // Ughh - coreboot likes to set a map at 0x0000-0x1000, but this
232 // confuses grub. So, override it.
233 add_e820(0, 16*1024, E820_RAM);
234
Kevin O'Connor1d247db2008-08-29 21:19:53 -0400235 // XXX - just create dummy smbios table for now - should detect if
236 // smbios/dmi table is found from coreboot and use that instead.
237 smbios_init();
238
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400239 return;
240
241fail:
242 // No table found.. Use 16Megs as a dummy value.
243 dprintf(1, "Unable to find coreboot table!\n");
Kevin O'Connore7916362008-12-28 22:03:17 -0500244 RamSize = 16*1024*1024;
245 RamSizeOver4G = 0;
Kevin O'Connor59a23bb2008-06-08 23:09:42 -0400246 add_e820(0, 16*1024*1024, E820_RAM);
247 return;
248}