243 lines
6.3 KiB
C
243 lines
6.3 KiB
C
// Coreboot interface support.
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//
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// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "memmap.h" // add_e820
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#include "util.h" // dprintf
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#include "pci.h" // struct pir_header
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#include "acpi.h" // struct rsdp_descriptor
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#include "biosvar.h" // GET_EBDA
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/****************************************************************
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* BIOS table copying
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****************************************************************/
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static void
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copy_pir(void *pos)
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{
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struct pir_header *p = pos;
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if (p->signature != PIR_SIGNATURE)
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return;
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if (PirOffset)
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return;
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if (p->size < sizeof(*p))
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return;
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if (checksum(pos, p->size) != 0)
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return;
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bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
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if (bios_table_cur_addr + p->size > bios_table_end_addr) {
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dprintf(1, "No room to copy PIR table!\n");
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return;
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}
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dprintf(1, "Copying PIR from %p to %x\n", pos, bios_table_cur_addr);
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memcpy((void*)bios_table_cur_addr, pos, p->size);
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PirOffset = bios_table_cur_addr - BUILD_BIOS_ADDR;
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bios_table_cur_addr += p->size;
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}
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static void
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copy_mptable(void *pos)
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{
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struct mptable_floating_s *p = pos;
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if (p->signature != MPTABLE_SIGNAURE)
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return;
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if (!p->physaddr)
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return;
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if (checksum(pos, sizeof(*p)) != 0)
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return;
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u32 length = p->length * 16;
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bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
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if (bios_table_cur_addr + length > bios_table_end_addr) {
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dprintf(1, "No room to copy MPTABLE!\n");
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return;
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}
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dprintf(1, "Copying MPTABLE from %p to %x\n", pos, bios_table_cur_addr);
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memcpy((void*)bios_table_cur_addr, pos, length);
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bios_table_cur_addr += length;
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}
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static void
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copy_acpi_rsdp(void *pos)
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{
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if (RsdpAddr)
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return;
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struct rsdp_descriptor *p = pos;
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if (p->signature != RSDP_SIGNATURE)
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return;
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u32 length = 20;
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if (checksum(pos, length) != 0)
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return;
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if (p->revision > 1) {
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length = p->length;
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if (checksum(pos, length) != 0)
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return;
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}
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bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16);
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if (bios_table_cur_addr + length > bios_table_end_addr) {
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dprintf(1, "No room to copy ACPI RSDP table!\n");
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return;
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}
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dprintf(1, "Copying ACPI RSDP from %p to %x\n", pos, bios_table_cur_addr);
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RsdpAddr = (void*)bios_table_cur_addr;
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memcpy(RsdpAddr, pos, length);
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bios_table_cur_addr += length;
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}
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// Attempt to find (and relocate) any standard bios tables found in a
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// given address range.
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static void
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scan_tables(u32 start, u32 size)
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{
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void *p = (void*)ALIGN(start, 16);
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void *end = (void*)start + size;
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for (; p<end; p += 16) {
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copy_pir(p);
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copy_mptable(p);
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copy_acpi_rsdp(p);
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}
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}
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/****************************************************************
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* Memory map
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****************************************************************/
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struct cb_header {
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u32 signature;
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u32 header_bytes;
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u32 header_checksum;
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u32 table_bytes;
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u32 table_checksum;
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u32 table_entries;
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};
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#define CB_SIGNATURE 0x4f49424C // "LBIO"
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struct cb_memory_range {
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u64 start;
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u64 size;
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u32 type;
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};
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#define CB_MEM_TABLE 16
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struct cb_memory {
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u32 tag;
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u32 size;
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struct cb_memory_range map[0];
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};
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#define CB_TAG_MEMORY 0x01
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#define MEM_RANGE_COUNT(_rec) \
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(((_rec)->size - sizeof(*(_rec))) / sizeof((_rec)->map[0]))
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static u16
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ipchksum(char *buf, int count)
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{
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u16 *p = (u16*)buf;
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u32 sum = 0;
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while (count > 1) {
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sum += *p++;
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count -= 2;
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}
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if (count)
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sum += *(u8*)p;
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16);
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return ~sum;
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}
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// Try to locate the coreboot header in a given address range.
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static struct cb_header *
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find_cb_header(char *addr, int len)
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{
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char *end = addr + len;
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for (; addr < end; addr += 16) {
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struct cb_header *cbh = (struct cb_header *)addr;
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if (cbh->signature != CB_SIGNATURE)
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continue;
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if (! cbh->table_bytes)
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continue;
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if (ipchksum(addr, sizeof(*cbh)) != 0)
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continue;
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if (ipchksum(addr + sizeof(*cbh), cbh->table_bytes)
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!= cbh->table_checksum)
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continue;
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return cbh;
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}
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return NULL;
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}
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// Try to find the coreboot memory table in the given coreboot table.
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static void *
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find_cb_subtable(struct cb_header *cbh, u32 tag)
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{
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char *tbl = (char *)cbh + sizeof(*cbh);
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int i;
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for (i=0; i<cbh->table_entries; i++) {
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struct cb_memory *cbm = (struct cb_memory *)tbl;
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tbl += cbm->size;
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if (cbm->tag == tag)
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return cbm;
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}
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return NULL;
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}
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// Populate max ram and e820 map info by scanning for a coreboot table.
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void
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coreboot_fill_map()
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{
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dprintf(3, "Attempting to find coreboot table\n");
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struct cb_header *cbh = find_cb_header(0, 0x1000);
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if (!cbh)
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goto fail;
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struct cb_memory *cbm = find_cb_subtable(cbh, CB_TAG_MEMORY);
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if (!cbm)
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goto fail;
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u64 maxram = 0, maxram_over4G = 0;
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int i, count = MEM_RANGE_COUNT(cbm);
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for (i=0; i<count; i++) {
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struct cb_memory_range *m = &cbm->map[i];
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u32 type = m->type;
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if (type == CB_MEM_TABLE) {
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type = E820_RESERVED;
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scan_tables(m->start, m->size);
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} else if (type == E820_ACPI || type == E820_RAM) {
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u64 end = m->start + m->size;
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if (end > 0x100000000ull) {
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end -= 0x100000000ull;
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if (end > maxram_over4G)
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maxram_over4G = end;
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} else if (end > maxram)
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maxram = end;
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}
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add_e820(m->start, m->size, type);
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}
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RamSize = maxram;
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RamSizeOver4G = maxram_over4G;
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// Ughh - coreboot likes to set a map at 0x0000-0x1000, but this
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// confuses grub. So, override it.
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add_e820(0, 16*1024, E820_RAM);
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// XXX - just create dummy smbios table for now - should detect if
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// smbios/dmi table is found from coreboot and use that instead.
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smbios_init();
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return;
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fail:
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// No table found.. Use 16Megs as a dummy value.
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dprintf(1, "Unable to find coreboot table!\n");
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RamSize = 16*1024*1024;
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RamSizeOver4G = 0;
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add_e820(0, 16*1024*1024, E820_RAM);
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return;
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}
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