src/arch/x86/boot/coreboot_table.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2003-2004 Eric Biederman
 * Copyright (C) 2005-2010 coresystems GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; version 2 of
 * the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */

#include <console/console.h>
#include <ip_checksum.h>
#include <boot/tables.h>
#include <boot/coreboot_tables.h>
#include <arch/coreboot_tables.h>
#include <string.h>
#include <version.h>
#include <device/device.h>
#include <stdlib.h>
#include <cbfs.h>
#include <cbmem.h>
#if CONFIG_USE_OPTION_TABLE
#include <option_table.h>
#endif
#if CONFIG_CHROMEOS
#include <arch/acpi.h>
#endif
#if CONFIG_ADD_FDT
#include <fdt/fdt.h>
#include <fdt/libfdt.h>
#include <fdt/libfdt_env.h>
#if CONFIG_CHROMEOS
#include <vendorcode/google/chromeos/gnvs.h>
#endif
#endif

static struct lb_header *lb_table_init(unsigned long addr)
{
	struct lb_header *header;

	/* 16 byte align the address */
	addr += 15;
	addr &= ~15;

	header = (void *)addr;
	header->signature[0] = 'L';
	header->signature[1] = 'B';
	header->signature[2] = 'I';
	header->signature[3] = 'O';
	header->header_bytes = sizeof(*header);
	header->header_checksum = 0;
	header->table_bytes = 0;
	header->table_checksum = 0;
	header->table_entries = 0;
	return header;
}

static struct lb_record *lb_first_record(struct lb_header *header)
{
	struct lb_record *rec;
	rec = (void *)(((char *)header) + sizeof(*header));
	return rec;
}

static struct lb_record *lb_last_record(struct lb_header *header)
{
	struct lb_record *rec;
	rec = (void *)(((char *)header) + sizeof(*header) + header->table_bytes);
	return rec;
}

#if 0
static struct lb_record *lb_next_record(struct lb_record *rec)
{
	rec = (void *)(((char *)rec) + rec->size);
	return rec;
}
#endif

static struct lb_record *lb_new_record(struct lb_header *header)
{
	struct lb_record *rec;
	rec = lb_last_record(header);
	if (header->table_entries) {
		header->table_bytes += rec->size;
	}
	rec = lb_last_record(header);
	header->table_entries++;
	rec->tag = LB_TAG_UNUSED;
	rec->size = sizeof(*rec);
	return rec;
}

static struct lb_memory *lb_memory(struct lb_header *header)
{
	struct lb_record *rec;
	struct lb_memory *mem;
	rec = lb_new_record(header);
	mem = (struct lb_memory *)rec;
	mem->tag = LB_TAG_MEMORY;
	mem->size = sizeof(*mem);
	return mem;
}

static struct lb_serial *lb_serial(struct lb_header *header)
{
#if CONFIG_CONSOLE_SERIAL8250
	struct lb_record *rec;
	struct lb_serial *serial;
	rec = lb_new_record(header);
	serial = (struct lb_serial *)rec;
	serial->tag = LB_TAG_SERIAL;
	serial->size = sizeof(*serial);
	serial->type = LB_SERIAL_TYPE_IO_MAPPED;
	serial->baseaddr = CONFIG_TTYS0_BASE;
	serial->baud = CONFIG_TTYS0_BAUD;
	return serial;
#elif CONFIG_CONSOLE_SERIAL8250MEM
	if (uartmem_getbaseaddr()) {
		struct lb_record *rec;
		struct lb_serial *serial;
		rec = lb_new_record(header);
		serial = (struct lb_serial *)rec;
		serial->tag = LB_TAG_SERIAL;
		serial->size = sizeof(*serial);
		serial->type = LB_SERIAL_TYPE_MEMORY_MAPPED;
		serial->baseaddr = uartmem_getbaseaddr();
		serial->baud = CONFIG_TTYS0_BAUD;
		return serial;
	} else {
		return NULL;
	}
#else
	return NULL;
#endif
}

#if CONFIG_CONSOLE_SERIAL8250 || CONFIG_CONSOLE_SERIAL8250MEM || \
    CONFIG_CONSOLE_LOGBUF || CONFIG_USBDEBUG
static void add_console(struct lb_header *header, u16 consoletype)
{
	struct lb_console *console;

	console = (struct lb_console *)lb_new_record(header);
	console->tag = LB_TAG_CONSOLE;
	console->size = sizeof(*console);
	console->type = consoletype;
}
#endif

static void lb_console(struct lb_header *header)
{
#if CONFIG_CONSOLE_SERIAL8250
	add_console(header, LB_TAG_CONSOLE_SERIAL8250);
#endif
#if CONFIG_CONSOLE_SERIAL8250MEM
	add_console(header, LB_TAG_CONSOLE_SERIAL8250MEM);
#endif
#if CONFIG_CONSOLE_LOGBUF
	add_console(header, LB_TAG_CONSOLE_LOGBUF);
#endif
#if CONFIG_USBDEBUG
	add_console(header, LB_TAG_CONSOLE_EHCI);
#endif
}

static void lb_framebuffer(struct lb_header *header)
{
#if CONFIG_FRAMEBUFFER_KEEP_VESA_MODE
	void fill_lb_framebuffer(struct lb_framebuffer *framebuffer);

	struct lb_framebuffer *framebuffer;
	framebuffer = (struct lb_framebuffer *)lb_new_record(header);
	framebuffer->tag = LB_TAG_FRAMEBUFFER;
	framebuffer->size = sizeof(*framebuffer);
	fill_lb_framebuffer(framebuffer);
#endif
}

#if CONFIG_CHROMEOS
static void lb_gpios(struct lb_header *header)
{
	struct lb_gpios *gpios;
	gpios = (struct lb_gpios *)lb_new_record(header);
	gpios->tag = LB_TAG_GPIO;
	gpios->size = sizeof(*gpios);
	gpios->count = 0;
	fill_lb_gpios(gpios);
}

static void lb_vdat(struct lb_header *header)
{
	struct lb_vdat* vdat;

	vdat = (struct lb_vdat *)lb_new_record(header);
	vdat->tag = LB_TAG_VDAT;
	vdat->size = sizeof(*vdat);
	acpi_get_vdat_info(&vdat->vdat_addr, &vdat->vdat_size);
}

static void lb_vbnv(struct lb_header *header)
{
	struct lb_vbnv* vbnv;

	vbnv = (struct lb_vbnv *)lb_new_record(header);
	vbnv->tag = LB_TAG_VBNV;
	vbnv->size = sizeof(*vbnv);
	vbnv->vbnv_start = CONFIG_VBNV_OFFSET + 14;
	vbnv->vbnv_size = CONFIG_VBNV_SIZE;

}
#endif

#if CONFIG_ADD_FDT
static void lb_map_lb_serial_to_fdt(struct fdt_header *fdt_header, struct lb_serial *serial)
{
	char serial_node_name[64];
	const int name_len = ARRAY_SIZE(serial_node_name) - 1;
	serial_node_name[name_len] = 0;
	int root_offset = fdt_path_offset(fdt_header, "/");

	/* Pick a name for the serial node. */
	if (serial) {
		sprintf(serial_node_name, "serial@%x", serial->baseaddr);
	} else {
		strncpy(serial_node_name, "null-serial@0", name_len);
	}

	/* Find or create the /aliases node. */
	int alias_offset = fdt_path_offset(fdt_header, "/aliases");
	if (alias_offset < 0) {
		/* It wasn't found, so try to create it. */
		alias_offset = fdt_add_subnode(fdt_header, root_offset,
			"/aliases");
	}
	if (alias_offset < 0)
		printk(BIOS_ERR, "Couldn't find/make fdt \"aliases\" node.\n");

	/* Add a "console" property, and point it at the serial node. */
	if (alias_offset >= 0) {
		char alias[name_len + 2];
		sprintf(alias, "/%s", serial_node_name);
		fdt_setprop_string(fdt_header, alias_offset, "console", alias);
	}

	/* Add the serial node itself. */
	int serial_offset =
		fdt_add_subnode(fdt_header, root_offset, serial_node_name);
	if (serial_offset < 0) {
		printk(BIOS_ERR, "Couldn't create serial node \"%s\"\n",
			serial_node_name);
	}

	/* If there's a serial node and device, populate the node. */
	if (serial_offset >= 0 && serial) {
		fdt_setprop_string(fdt_header, serial_offset,
			"compatible", "ns16550");
		uint32_t reg[2] = {
			cpu_to_fdt32(serial->baseaddr),
			cpu_to_fdt32(0x8)
		};
		fdt_setprop(fdt_header, serial_offset,
			"reg", reg, sizeof(reg));
		fdt_setprop_cell(fdt_header, serial_offset,
			"id", 1);
		fdt_setprop_cell(fdt_header, serial_offset,
			"reg-shift", 1);
		fdt_setprop_cell(fdt_header, serial_offset,
			"baudrate", serial->baud);
#if CONFIG_DRIVERS_OXFORD_OXPCIE
		fdt_setprop_cell(fdt_header, serial_offset,
			"clock-frequency", 4000000);
#else
		fdt_setprop_cell(fdt_header, serial_offset,
			"clock-frequency", 115200);
#endif
		fdt_setprop_cell(fdt_header, serial_offset,
			"multiplier", 1);
		if (serial->type == LB_SERIAL_TYPE_IO_MAPPED) {
			fdt_setprop_cell(fdt_header, serial_offset,
				"io-mapped", 1);
		}
		fdt_setprop_string(fdt_header, serial_offset,
			"status", "ok");
	}
}

static void lb_fdt(struct lb_header *header, struct lb_serial *serial)
{
	struct lb_fdt *fdt_record;
	struct fdt_header *fdt_header;
	u32 magic, fdt_size;

	fdt_header = cbfs_find_file(CONFIG_FDT_FILE_NAME, CBFS_TYPE_FDT);
	if (!fdt_header) {
		printk(BIOS_ERR, "Can't find FDT (%s)\n", CONFIG_FDT_FILE_NAME);
		return;
	}

	magic = fdt32_to_cpu(fdt_header->magic);
	if (magic != FDT_MAGIC) {
		printk(BIOS_ERR, "FDT header corrupted (0x%x)\n", magic);
		return;
	}

	fdt_size = fdt32_to_cpu(fdt_header->totalsize);
	fdt_record = (struct lb_fdt *) lb_new_record(header);
	fdt_record->tag = LB_TAG_FDT;
	fdt_record->size = sizeof(*fdt_record) + fdt_size;
	memcpy(fdt_record + 1, fdt_header, fdt_size);
	fdt_header = (struct fdt_header *)(fdt_record + 1);

#if CONFIG_CHROMEOS
	chromeos_set_vboot_data_ptr(fdt_header);
#endif

	lb_map_lb_serial_to_fdt(fdt_header, serial);

	fdt_size = fdt32_to_cpu(fdt_header->totalsize);
	fdt_record->size = sizeof(*fdt_record) + fdt_size;

	printk(BIOS_SPEW, "FDT of %d bytes added\n", fdt_size);
}
#endif

static void add_cbmem_pointers(struct lb_header *header)
{
	/*
	 * These CBMEM sections' addresses are included in the coreboot table
	 * with the appropriate tags.
	 */
	const struct section_id {
		int cbmem_id;
		int table_tag;
	} section_ids[] = {
		{CBMEM_ID_TIMESTAMP, LB_TAG_TIMESTAMPS},
		{CBMEM_ID_MRCDATA, LB_TAG_MRC_CACHE},
		{CBMEM_ID_CONSOLE, LB_TAG_CBMEM_CONSOLE}
	};
	int i;

	for (i = 0; i < ARRAY_SIZE(section_ids); i++) {
		const struct section_id *sid = section_ids + i;
		struct lb_cbmem_ref *cbmem_ref;
		void *cbmem_addr = cbmem_find(sid->cbmem_id);

		if (!cbmem_addr)
			continue;  /* This section is not present */

		cbmem_ref = (struct lb_cbmem_ref *)lb_new_record(header);
		if (!cbmem_ref) {
			printk(BIOS_ERR, "No more room in coreboot table!\n");
			break;
		}
		cbmem_ref->tag = sid->table_tag;
		cbmem_ref->size = sizeof(*cbmem_ref);
		cbmem_ref->cbmem_addr = cbmem_addr;
	}
}

static struct lb_mainboard *lb_mainboard(struct lb_header *header)
{
	struct lb_record *rec;
	struct lb_mainboard *mainboard;
	rec = lb_new_record(header);
	mainboard = (struct lb_mainboard *)rec;
	mainboard->tag = LB_TAG_MAINBOARD;

	mainboard->size = (sizeof(*mainboard) +
		strlen(mainboard_vendor) + 1 +
		strlen(mainboard_part_number) + 1 +
		3) & ~3;

	mainboard->vendor_idx = 0;
	mainboard->part_number_idx = strlen(mainboard_vendor) + 1;

	memcpy(mainboard->strings + mainboard->vendor_idx,
		mainboard_vendor,      strlen(mainboard_vendor) + 1);
	memcpy(mainboard->strings + mainboard->part_number_idx,
		mainboard_part_number, strlen(mainboard_part_number) + 1);

	return mainboard;
}

#if CONFIG_USE_OPTION_TABLE
static struct cmos_checksum *lb_cmos_checksum(struct lb_header *header)
{
	struct lb_record *rec;
	struct cmos_checksum *cmos_checksum;
	rec = lb_new_record(header);
	cmos_checksum = (struct cmos_checksum *)rec;
	cmos_checksum->tag = LB_TAG_OPTION_CHECKSUM;

	cmos_checksum->size = (sizeof(*cmos_checksum));

	cmos_checksum->range_start = LB_CKS_RANGE_START * 8;
	cmos_checksum->range_end = ( LB_CKS_RANGE_END * 8 ) + 7;
	cmos_checksum->location = LB_CKS_LOC * 8;
	cmos_checksum->type = CHECKSUM_PCBIOS;

	return cmos_checksum;
}
#endif

static void lb_strings(struct lb_header *header)
{
	static const struct {
		uint32_t tag;
		const char *string;
	} strings[] = {
		{ LB_TAG_VERSION,        coreboot_version,        },
		{ LB_TAG_EXTRA_VERSION,  coreboot_extra_version,  },
		{ LB_TAG_BUILD,          coreboot_build,          },
		{ LB_TAG_COMPILE_TIME,   coreboot_compile_time,   },
		{ LB_TAG_COMPILE_BY,     coreboot_compile_by,     },
		{ LB_TAG_COMPILE_HOST,   coreboot_compile_host,   },
		{ LB_TAG_COMPILE_DOMAIN, coreboot_compile_domain, },
		{ LB_TAG_COMPILER,       coreboot_compiler,       },
		{ LB_TAG_LINKER,         coreboot_linker,         },
		{ LB_TAG_ASSEMBLER,      coreboot_assembler,      },
	};
	unsigned int i;
	for(i = 0; i < ARRAY_SIZE(strings); i++) {
		struct lb_string *rec;
		size_t len;
		rec = (struct lb_string *)lb_new_record(header);
		len = strlen(strings[i].string);
		rec->tag = strings[i].tag;
		rec->size = (sizeof(*rec) + len + 1 + 3) & ~3;
		memcpy(rec->string, strings[i].string, len+1);
	}

}

#if CONFIG_WRITE_HIGH_TABLES == 1
static struct lb_forward *lb_forward(struct lb_header *header, struct lb_header *next_header)
{
	struct lb_record *rec;
	struct lb_forward *forward;
	rec = lb_new_record(header);
	forward = (struct lb_forward *)rec;
	forward->tag = LB_TAG_FORWARD;
	forward->size = sizeof(*forward);
	forward->forward = (uint64_t)(unsigned long)next_header;
	return forward;
}
#endif

void lb_memory_range(struct lb_memory *mem,
	uint32_t type, uint64_t start, uint64_t size)
{
	int entries;
	entries = (mem->size - sizeof(*mem))/sizeof(mem->map[0]);
	mem->map[entries].start = pack_lb64(start);
	mem->map[entries].size = pack_lb64(size);
	mem->map[entries].type = type;
	mem->size += sizeof(mem->map[0]);
}

static void lb_reserve_table_memory(struct lb_header *head)
{
	struct lb_record *last_rec;
	struct lb_memory *mem;
	uint64_t start;
	uint64_t end;
	int i, entries;

	last_rec = lb_last_record(head);
	mem = get_lb_mem();
	start = (unsigned long)head;
	end = (unsigned long)last_rec;
	entries = (mem->size - sizeof(*mem))/sizeof(mem->map[0]);
	/* Resize the right two memory areas so this table is in
	 * a reserved area of memory.  Everything has been carefully
	 * setup so that is all we need to do.
	 */
	for(i = 0; i < entries; i++ ) {
		uint64_t map_start = unpack_lb64(mem->map[i].start);
		uint64_t map_end = map_start + unpack_lb64(mem->map[i].size);
		/* Does this area need to be expanded? */
		if (map_end == start) {
			mem->map[i].size = pack_lb64(end - map_start);
		}
		/* Does this area need to be contracted? */
		else if (map_start == start) {
			mem->map[i].start = pack_lb64(end);
			mem->map[i].size = pack_lb64(map_end - end);
		}
	}
}

static unsigned long lb_table_fini(struct lb_header *head, int fixup)
{
	struct lb_record *rec, *first_rec;
	rec = lb_last_record(head);
	if (head->table_entries) {
		head->table_bytes += rec->size;
	}

	if (fixup)
		lb_reserve_table_memory(head);

	first_rec = lb_first_record(head);
	head->table_checksum = compute_ip_checksum(first_rec, head->table_bytes);
	head->header_checksum = 0;
	head->header_checksum = compute_ip_checksum(head, sizeof(*head));
	printk(BIOS_DEBUG,
	       "Wrote coreboot table at: %p, 0x%x bytes, checksum %x\n",
	       head, head->table_bytes, head->table_checksum);
	return (unsigned long)rec + rec->size;
}

static void lb_cleanup_memory_ranges(struct lb_memory *mem)
{
	int entries;
	int i, j;
	entries = (mem->size - sizeof(*mem))/sizeof(mem->map[0]);

	/* Sort the lb memory ranges */
	for(i = 0; i < entries; i++) {
		uint64_t entry_start = unpack_lb64(mem->map[i].start);
		for(j = i; j < entries; j++) {
			uint64_t temp_start = unpack_lb64(mem->map[j].start);
			if (temp_start < entry_start) {
				struct lb_memory_range tmp;
				tmp = mem->map[i];
				mem->map[i] = mem->map[j];
				mem->map[j] = tmp;
			}
		}
	}

	/* Merge adjacent entries */
	for(i = 0; (i + 1) < entries; i++) {
		uint64_t start, end, nstart, nend;
		if (mem->map[i].type != mem->map[i + 1].type) {
			continue;
		}
		start  = unpack_lb64(mem->map[i].start);
		end    = start + unpack_lb64(mem->map[i].size);
		nstart = unpack_lb64(mem->map[i + 1].start);
		nend   = nstart + unpack_lb64(mem->map[i + 1].size);
		if ((start <= nstart) && (end > nstart)) {
			if (start > nstart) {
				start = nstart;
			}
			if (end < nend) {
				end = nend;
			}
			/* Record the new region size */
			mem->map[i].start = pack_lb64(start);
			mem->map[i].size  = pack_lb64(end - start);

			/* Delete the entry I have merged with */
			memmove(&mem->map[i + 1], &mem->map[i + 2],
				((entries - i - 2) * sizeof(mem->map[0])));
			mem->size -= sizeof(mem->map[0]);
			entries -= 1;
			/* See if I can merge with the next entry as well */
			i -= 1;
		}
	}
}

static void lb_remove_memory_range(struct lb_memory *mem,
	uint64_t start, uint64_t size)
{
	uint64_t end;
	int entries;
	int i;

	end = start + size;
	entries = (mem->size - sizeof(*mem))/sizeof(mem->map[0]);

	/* Remove a reserved area from the memory map */
	for(i = 0; i < entries; i++) {
		uint64_t map_start = unpack_lb64(mem->map[i].start);
		uint64_t map_end   = map_start + unpack_lb64(mem->map[i].size);
		if ((start <= map_start) && (end >= map_end)) {
			/* Remove the completely covered range */
			memmove(&mem->map[i], &mem->map[i + 1],
				((entries - i - 1) * sizeof(mem->map[0])));
			mem->size -= sizeof(mem->map[0]);
			entries -= 1;
			/* Since the index will disappear revisit what will appear here */
			i -= 1;
		}
		else if ((start > map_start) && (end < map_end)) {
			/* Split the memory range */
			memmove(&mem->map[i + 1], &mem->map[i],
				((entries - i) * sizeof(mem->map[0])));
			mem->size += sizeof(mem->map[0]);
			entries += 1;
			/* Update the first map entry */
			mem->map[i].size = pack_lb64(start - map_start);
			/* Update the second map entry */
			mem->map[i + 1].start = pack_lb64(end);
			mem->map[i + 1].size  = pack_lb64(map_end - end);
			/* Don't bother with this map entry again */
			i += 1;
		}
		else if ((start <= map_start) && (end > map_start)) {
			/* Shrink the start of the memory range */
			mem->map[i].start = pack_lb64(end);
			mem->map[i].size  = pack_lb64(map_end - end);
		}
		else if ((start < map_end) && (start > map_start)) {
			/* Shrink the end of the memory range */
			mem->map[i].size = pack_lb64(start - map_start);
		}
	}
}

/* This function is used in mainboard specific code, too */
void lb_add_memory_range(struct lb_memory *mem,
	uint32_t type, uint64_t start, uint64_t size)
{
	lb_remove_memory_range(mem, start, size);
	lb_memory_range(mem, type, start, size);
	lb_cleanup_memory_ranges(mem);
}

static void lb_dump_memory_ranges(struct lb_memory *mem)
{
	int entries;
	int i;
	entries = (mem->size - sizeof(*mem))/sizeof(mem->map[0]);

	printk(BIOS_DEBUG, "coreboot memory table:\n");
	for(i = 0; i < entries; i++) {
		uint64_t entry_start = unpack_lb64(mem->map[i].start);
		uint64_t entry_size = unpack_lb64(mem->map[i].size);
		const char *entry_type;

		switch (mem->map[i].type) {
		case LB_MEM_RAM: entry_type="RAM"; break;
		case LB_MEM_RESERVED: entry_type="RESERVED"; break;
		case LB_MEM_ACPI: entry_type="ACPI"; break;
		case LB_MEM_NVS: entry_type="NVS"; break;
		case LB_MEM_UNUSABLE: entry_type="UNUSABLE"; break;
		case LB_MEM_VENDOR_RSVD: entry_type="VENDOR RESERVED"; break;
		case LB_MEM_TABLE: entry_type="CONFIGURATION TABLES"; break;
		default: entry_type="UNKNOWN!"; break;
		}

		printk(BIOS_DEBUG, "%2d. %016llx-%016llx: %s\n",
			i, entry_start, entry_start+entry_size-1, entry_type);

	}
}


/* Routines to extract part so the coreboot table or
 * information from the coreboot table after we have written it.
 * Currently get_lb_mem relies on a global we can change the
 * implementaiton.
 */
static struct lb_memory *mem_ranges = 0;
struct lb_memory *get_lb_mem(void)
{
	return mem_ranges;
}

static void build_lb_mem_range(void *gp, struct device *dev, struct resource *res)
{
	struct lb_memory *mem = gp;
	lb_memory_range(mem, LB_MEM_RAM, res->base, res->size);
}

static struct lb_memory *build_lb_mem(struct lb_header *head)
{
	struct lb_memory *mem;

	/* Record where the lb memory ranges will live */
	mem = lb_memory(head);
	mem_ranges = mem;

	/* Build the raw table of memory */
	search_global_resources(
		IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE,
		build_lb_mem_range, mem);
	lb_cleanup_memory_ranges(mem);
	return mem;
}

static void lb_add_rsvd_range(void *gp, struct device *dev, struct resource *res)
{
	struct lb_memory *mem = gp;
	lb_add_memory_range(mem, LB_MEM_RESERVED, res->base, res->size);
}

static void add_lb_reserved(struct lb_memory *mem)
{
	/* Add reserved ranges */
	search_global_resources(
		IORESOURCE_MEM | IORESOURCE_RESERVE, IORESOURCE_MEM | IORESOURCE_RESERVE,
		lb_add_rsvd_range, mem);
}

unsigned long write_coreboot_table(
	unsigned long low_table_start, unsigned long low_table_end,
	unsigned long rom_table_start, unsigned long rom_table_end)
{
	struct lb_header *head;
	struct lb_memory *mem;

#if CONFIG_WRITE_HIGH_TABLES
	printk(BIOS_DEBUG, "Writing high table forward entry at 0x%08lx\n",
			low_table_end);
	head = lb_table_init(low_table_end);
	lb_forward(head, (struct lb_header*)rom_table_end);

	low_table_end = (unsigned long) lb_table_fini(head, 0);
	printk(BIOS_DEBUG, "New low_table_end: 0x%08lx\n", low_table_end);
	printk(BIOS_DEBUG, "Now going to write high coreboot table at 0x%08lx\n",
			rom_table_end);

	head = lb_table_init(rom_table_end);
	rom_table_end = (unsigned long)head;
	printk(BIOS_DEBUG, "rom_table_end = 0x%08lx\n", rom_table_end);
#else
	if(low_table_end > (0x1000 - sizeof(struct lb_header))) { /* after 4K */
		/* We need to put lbtable on  to [0xf0000,0x100000) */
		head = lb_table_init(rom_table_end);
		rom_table_end = (unsigned long)head;
	} else {
		head = lb_table_init(low_table_end);
		low_table_end = (unsigned long)head;
	}
#endif

	printk(BIOS_DEBUG, "Adjust low_table_end from 0x%08lx to ", low_table_end);
	low_table_end += 0xfff; // 4K aligned
	low_table_end &= ~0xfff;
	printk(BIOS_DEBUG, "0x%08lx \n", low_table_end);

	/* The Linux kernel assumes this region is reserved */
	printk(BIOS_DEBUG, "Adjust rom_table_end from 0x%08lx to ", rom_table_end);
	rom_table_end += 0xffff; // 64K align
	rom_table_end &= ~0xffff;
	printk(BIOS_DEBUG, "0x%08lx \n", rom_table_end);

#if CONFIG_USE_OPTION_TABLE
	{
		struct cmos_option_table *option_table = cbfs_find_file("cmos_layout.bin", 0x1aa);
		if (option_table) {
			struct lb_record *rec_dest = lb_new_record(head);
			/* Copy the option config table, it's already a lb_record... */
			memcpy(rec_dest,  option_table, option_table->size);
			/* Create cmos checksum entry in coreboot table */
			lb_cmos_checksum(head);
		} else {
			printk(BIOS_ERR, "cmos_layout.bin could not be found!\n");
		}
	}
#endif
	/* Record where RAM is located */
	mem = build_lb_mem(head);

	/* Record the mptable and the the lb_table (This will be adjusted later) */
	lb_add_memory_range(mem, LB_MEM_TABLE,
		low_table_start, low_table_end - low_table_start);

	/* Record the pirq table, acpi tables, and maybe the mptable */
	lb_add_memory_range(mem, LB_MEM_TABLE,
		rom_table_start, rom_table_end-rom_table_start);

#if CONFIG_WRITE_HIGH_TABLES
	printk(BIOS_DEBUG, "Adding high table area\n");
	// should this be LB_MEM_ACPI?
	lb_add_memory_range(mem, LB_MEM_TABLE,
		high_tables_base, high_tables_size);
#endif

	/* Add reserved regions */
	add_lb_reserved(mem);

#if CONFIG_HAVE_MAINBOARD_RESOURCES
	add_mainboard_resources(mem);
#endif

	lb_dump_memory_ranges(mem);

	/* Note:
	 * I assume that there is always memory at immediately after
	 * the low_table_end.  This means that after I setup the coreboot table.
	 * I can trivially fixup the reserved memory ranges to hold the correct
	 * size of the coreboot table.
	 */

	/* Record our motherboard */
	lb_mainboard(head);
	/* Record the serial port, if present */
	struct lb_serial *serial;
	serial = lb_serial(head);
	/* Record our console setup */
	lb_console(head);
	/* Record our various random string information */
	lb_strings(head);
	/* Record our framebuffer */
	lb_framebuffer(head);

#if CONFIG_CHROMEOS
	/* Record our GPIO settings (ChromeOS specific) */
	lb_gpios(head);

	/* pass along the VDAT buffer adress */
	lb_vdat(head);

	/* pass along VBNV offsets in CMOS */
	lb_vbnv(head);
#endif
#if CONFIG_ADD_FDT
	/*
	 * Copy FDT from CBFS into the coreboot table possibly augmenting it
	 * along the way.
	 */
	lb_fdt(head, serial);
#endif
	add_cbmem_pointers(head);

	/* Remember where my valid memory ranges are */
	return lb_table_fini(head, 1);

}