src/module/handoff/coreboot.c - third_party/depthcharge - Git at Google

 /*
  * Copyright (C) 2008 Advanced Micro Devices, Inc.
  * Copyright (C) 2009 coresystems GmbH
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #include <assert.h>
 #include <coreboot_tables.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <sysinfo.h>

 #include "base/fwdb.h"
 #include "base/memory.h"
 #include "base/timestamp.h"
 #include "drivers/framebuffer/framebuffer.h"
 #include "vboot/util/vboot_handoff.h"

 /*
  * The code in this file applies to all coreboot architectures. Some coreboot
  * table tags are architecture specific, they are handled by their respective
  * cb_parse_arch_specific() functions.
  */

 /* === Parsing code === */
 /* This is the generic parsing code. */

 static void cb_parse_memory(void *ptr, struct sysinfo_t *info)
 {
 	struct cb_memory *mem = ptr;
 	int count = MEM_RANGE_COUNT(mem);

 	E820MemRanges *e820_map = get_e820_mem_ranges();
 	if (!e820_map)
 		return;

 	if (count > ARRAY_SIZE(e820_map->ranges))
 		count = ARRAY_SIZE(e820_map->ranges);

 	e820_map->num_ranges = count;
 	for (int i = 0; i < count; i++) {
 		struct cb_memory_range *range = MEM_RANGE_PTR(mem, i);
 		E820MemRange *e820 = &e820_map->ranges[i];
 		e820->base = cb_unpack64(range->start);
 		e820->size = cb_unpack64(range->size);

 		switch (range->type) {
 		case CB_MEM_RAM:
 		case CB_MEM_RESERVED:
 		case CB_MEM_ACPI:
 		case CB_MEM_NVS:
 		case CB_MEM_UNUSABLE:
 			e820->type = range->type;
 			break;
 		case CB_MEM_TABLE:
 			e820->type = E820MemRange_Reserved;
 		default:
 			e820->type = E820MemRange_Unusable;
 		}
 		e820->handoff_tag = range->type;
 	}
 }

 static void cb_parse_vboot_handoff(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct lb_range *vbho = (struct lb_range *)ptr;
 	struct vboot_handoff *vboot_handoff =
 		(struct vboot_handoff *)(uintptr_t)vbho->range_start;

 	if (vbho->range_size != sizeof(struct vboot_handoff))
 		return;

 	FwdbEntry shared_data = {
 		.ptr = &vboot_handoff->shared_data[0],
 		.size = ARRAY_SIZE(vboot_handoff->shared_data),
 	};
 	fwdb_access("vboot.shared_data", NULL, &shared_data);

 	FwdbEntry init_params = {
 		.ptr = &vboot_handoff->init_params,
 		.size = sizeof(vboot_handoff->init_params),
 	};
 	fwdb_access("vboot.handoff.init_params", NULL, &init_params);
 }

 static void cb_parse_vbnv(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct lb_range *vbnv = (struct lb_range *)ptr;

 	info->vbnv_start = vbnv->range_start;
 	info->vbnv_size = vbnv->range_size;
 }

 static void cb_parse_gpios(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct cb_gpios *gpios = (struct cb_gpios *)ptr;

 	const char prefix[] = "gpio.";
 	char name_buf[sizeof(prefix) + sizeof(gpios->gpios[0].name)];
 	memset(name_buf, 0, sizeof(name_buf));
 	memcpy(name_buf, prefix, sizeof(prefix));
 	char *suffix_ptr = &name_buf[sizeof(prefix) - 1];

 	for (int i = 0; i < gpios->count; i++) {
 		struct cb_gpio *gpio = &gpios->gpios[i];

 		uint8_t val = gpio->value;
 		if (gpio->polarity == CB_GPIO_ACTIVE_LOW)
 			val = !val;

 		FwdbEntry gpio_entry = {
 			.ptr = &val,
 			.size = sizeof(val),
 		};
 		memcpy(suffix_ptr, gpio->name, sizeof(gpio->name));
 		fwdb_access(name_buf, NULL, &gpio_entry);
 	}
 }

 static void cb_parse_vdat(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct lb_range *vdat = (struct lb_range *) ptr;

 	info->vdat_addr = (void *)(uintptr_t)vdat->range_start;
 	info->vdat_size = vdat->range_size;
 }

 static void cb_parse_tstamp(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct cb_cbmem_tab *const cbmem = (struct cb_cbmem_tab *)ptr;
 	info->tstamp_table = (void *)(uintptr_t)cbmem->cbmem_tab;

 	TimestampTable *table = (void *)(uintptr_t)cbmem->cbmem_tab;
 	FwdbEntry timestamp_table_entry = {
 		.ptr = table,
 		.size = offsetof(TimestampTable, entries) +
 			table->max_entries * sizeof(TimestampEntry),
 	};
 	fwdb_access("timestamp table", NULL, &timestamp_table_entry);
 }

 static void cb_parse_cbmem_cons(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct cb_cbmem_tab *const cbmem = (struct cb_cbmem_tab *)ptr;
 	info->cbmem_cons = (void *)(uintptr_t)cbmem->cbmem_tab;
 }

 static void cb_parse_acpi_gnvs(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct cb_cbmem_tab *const cbmem = (struct cb_cbmem_tab *)ptr;
 	info->acpi_gnvs = (void *)(uintptr_t)cbmem->cbmem_tab;
 }

 static void cb_parse_board_id(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct cb_board_id *const cbbid = (struct cb_board_id *)ptr;
 	info->board_id = cbbid->board_id;
 }

 static void cb_parse_ram_code(unsigned char *ptr, struct sysinfo_t *info)
 {
 	struct cb_ram_code *const ram_code = (struct cb_ram_code *)ptr;

 	FwdbEntry ram_code_entry = {
 		.ptr = &ram_code->ram_code,
 		.size = sizeof(ram_code->ram_code),
 	};
 	fwdb_access("coreboot.ram_code", NULL, &ram_code_entry);
 }

 static void cb_parse_framebuffer(void *ptr, struct sysinfo_t *info)
 {
 	struct cb_framebuffer *cbfb = ptr;
 	FrameBuffer fb = {
 		.header = {
 			.version = FrameBufferCurrentVersion,
 		},
 		.buffer = (void *)(uintptr_t)cbfb->physical_address,
 		.resolution = {
 			.x = cbfb->x_resolution,
 			.y = cbfb->y_resolution,
 		},
 		.bytes_per_line = cbfb->bytes_per_line,
 		.bits_per_pixel = cbfb->bits_per_pixel,
 		.red = {
 			.pos = cbfb->red_mask_pos,
 			.size = cbfb->red_mask_size & 0x7,
 		},
 		.green = {
 			.pos = cbfb->green_mask_pos,
 			.size = cbfb->green_mask_size & 0x7,
 		},
 		.blue = {
 			.pos = cbfb->blue_mask_pos,
 			.size = cbfb->blue_mask_size & 0x7,
 		},
 	};

 	framebuffer_write_to_fwdb(&fb);
 }

 static void cb_parse_ramoops(void *ptr, struct sysinfo_t *info)
 {
 	struct lb_range *ramoops = (struct lb_range *)ptr;

 	info->ramoops_buffer = ramoops->range_start;
 	info->ramoops_buffer_size = ramoops->range_size;
 }

 static void cb_parse_mtc(void *ptr, struct sysinfo_t *info)
 {
 	struct lb_range *mtc = (struct lb_range *)ptr;

 	info->mtc_start = mtc->range_start;
 	info->mtc_size = mtc->range_size;
 }

 static void cb_parse_spi_flash(void *ptr, struct sysinfo_t *info)
 {
 	struct cb_spi_flash *flash = (struct cb_spi_flash *)ptr;

 	info->spi_flash.size = flash->flash_size;
 	info->spi_flash.sector_size = flash->sector_size;
 	info->spi_flash.erase_cmd = flash->erase_cmd;
 }

 static void cb_parse_boot_media_params(unsigned char *ptr,
 				       struct sysinfo_t *info)
 {
 	struct cb_boot_media_params *const bmp =
 			(struct cb_boot_media_params *)ptr;
 	info->cbfs_offset = bmp->cbfs_offset;
 	info->cbfs_size = bmp->cbfs_size;
 }

 int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
 {
 	struct cb_header *header;
 	unsigned char *ptr = addr;
 	void *forward;
 	int i;

 	for (i = 0; i < len; i += 16, ptr += 16) {
 		header = (struct cb_header *)ptr;
 		if (!strncmp((const char *)header->signature, "LBIO", 4))
 			break;
 	}

 	/* We walked the entire space and didn't find anything. */
 	if (i >= len)
 		return -1;

 	/* Make sure the checksums match. */
 	if (ipchecksum((uint16_t *)header, sizeof(*header)) != 0)
 		return -1;

 	if (!header->table_bytes)
 		return 0;

 	if (ipchecksum((uint16_t *)(ptr + sizeof(*header)),
 		       header->table_bytes) != header->table_checksum)
 		return -1;

 	info->header = header;

 	/*
 	 * Board straps represented by numerical values are small numbers.
 	 * Preset them to an invalid value in case the firmware does not
 	 * supply the info.
 	 */
 	info->board_id = ~0;

 	/* Now, walk the tables. */
 	ptr += header->header_bytes;

 	for (i = 0; i < header->table_entries; i++) {
 		struct cb_record *rec = (struct cb_record *)ptr;

 		/* We only care about a few tags here (maybe more later). */
 		switch (rec->tag) {
 		case CB_TAG_FORWARD:
 			forward = (void *)(uintptr_t)
 				((struct cb_forward *)rec)->forward;
 			return cb_parse_header(forward, len, info);
 			continue;
 		case CB_TAG_MEMORY:
 			cb_parse_memory(ptr, info);
 			break;
 		case CB_TAG_FRAMEBUFFER:
 			cb_parse_framebuffer(ptr, info);
 			break;
 		case CB_TAG_GPIO:
 			cb_parse_gpios(ptr, info);
 			break;
 		case CB_TAG_VDAT:
 			cb_parse_vdat(ptr, info);
 			break;
 		case CB_TAG_VBNV:
 			cb_parse_vbnv(ptr, info);
 			break;
 		case CB_TAG_VBOOT_HANDOFF:
 			cb_parse_vboot_handoff(ptr, info);
 			break;
 		case CB_TAG_TIMESTAMPS:
 			cb_parse_tstamp(ptr, info);
 			break;
 		case CB_TAG_CBMEM_CONSOLE:
 			cb_parse_cbmem_cons(ptr, info);
 			break;
 		case CB_TAG_ACPI_GNVS:
 			cb_parse_acpi_gnvs(ptr, info);
 			break;
 		case CB_TAG_BOARD_ID:
 			cb_parse_board_id(ptr, info);
 			break;
 		case CB_TAG_RAM_CODE:
 			cb_parse_ram_code(ptr, info);
 			break;
 		case CB_TAG_RAM_OOPS:
 			cb_parse_ramoops(ptr, info);
 			break;
 		case CB_TAG_SPI_FLASH:
 			cb_parse_spi_flash(ptr, info);
 			break;
 		case CB_TAG_MTC:
 			cb_parse_mtc(ptr, info);
 			break;
 		case CB_TAG_BOOT_MEDIA_PARAMS:
 			cb_parse_boot_media_params(ptr, info);
 			break;
 		default:
 			cb_parse_arch_specific(rec, info);
 			break;
 		}

 		ptr += rec->size;
 	}

 	return 0;
 }
	/*
	* Copyright (C) 2008 Advanced Micro Devices, Inc.
	* Copyright (C) 2009 coresystems GmbH
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include <assert.h>
	#include <coreboot_tables.h>
	#include <stdint.h>
	#include <stdlib.h>
	#include <sysinfo.h>

	#include "base/fwdb.h"
	#include "base/memory.h"
	#include "base/timestamp.h"
	#include "drivers/framebuffer/framebuffer.h"
	#include "vboot/util/vboot_handoff.h"

	/*
	* The code in this file applies to all coreboot architectures. Some coreboot
	* table tags are architecture specific, they are handled by their respective
	* cb_parse_arch_specific() functions.
	*/

	/* === Parsing code === */
	/* This is the generic parsing code. */

	static void cb_parse_memory(void ptr, struct sysinfo_t info)
	{
	struct cb_memory *mem = ptr;
	int count = MEM_RANGE_COUNT(mem);

	E820MemRanges *e820_map = get_e820_mem_ranges();
	if (!e820_map)
	return;

	if (count > ARRAY_SIZE(e820_map->ranges))
	count = ARRAY_SIZE(e820_map->ranges);

	e820_map->num_ranges = count;
	for (int i = 0; i < count; i++) {
	struct cb_memory_range *range = MEM_RANGE_PTR(mem, i);
	E820MemRange *e820 = &e820_map->ranges[i];
	e820->base = cb_unpack64(range->start);
	e820->size = cb_unpack64(range->size);

	switch (range->type) {
	case CB_MEM_RAM:
	case CB_MEM_RESERVED:
	case CB_MEM_ACPI:
	case CB_MEM_NVS:
	case CB_MEM_UNUSABLE:
	e820->type = range->type;
	break;
	case CB_MEM_TABLE:
	e820->type = E820MemRange_Reserved;
	default:
	e820->type = E820MemRange_Unusable;
	}
	e820->handoff_tag = range->type;
	}
	}

	static void cb_parse_vboot_handoff(unsigned char ptr, struct sysinfo_t info)
	{
	struct lb_range vbho = (struct lb_range )ptr;
	struct vboot_handoff *vboot_handoff =
	(struct vboot_handoff *)(uintptr_t)vbho->range_start;

	if (vbho->range_size != sizeof(struct vboot_handoff))
	return;

	FwdbEntry shared_data = {
	.ptr = &vboot_handoff->shared_data[0],
	.size = ARRAY_SIZE(vboot_handoff->shared_data),
	};
	fwdb_access("vboot.shared_data", NULL, &shared_data);

	FwdbEntry init_params = {
	.ptr = &vboot_handoff->init_params,
	.size = sizeof(vboot_handoff->init_params),
	};
	fwdb_access("vboot.handoff.init_params", NULL, &init_params);
	}

	static void cb_parse_vbnv(unsigned char ptr, struct sysinfo_t info)
	{
	struct lb_range vbnv = (struct lb_range )ptr;

	info->vbnv_start = vbnv->range_start;
	info->vbnv_size = vbnv->range_size;
	}

	static void cb_parse_gpios(unsigned char ptr, struct sysinfo_t info)
	{
	struct cb_gpios gpios = (struct cb_gpios )ptr;

	const char prefix[] = "gpio.";
	char name_buf[sizeof(prefix) + sizeof(gpios->gpios[0].name)];
	memset(name_buf, 0, sizeof(name_buf));
	memcpy(name_buf, prefix, sizeof(prefix));
	char *suffix_ptr = &name_buf[sizeof(prefix) - 1];

	for (int i = 0; i < gpios->count; i++) {
	struct cb_gpio *gpio = &gpios->gpios[i];

	uint8_t val = gpio->value;
	if (gpio->polarity == CB_GPIO_ACTIVE_LOW)
	val = !val;

	FwdbEntry gpio_entry = {
	.ptr = &val,
	.size = sizeof(val),
	};
	memcpy(suffix_ptr, gpio->name, sizeof(gpio->name));
	fwdb_access(name_buf, NULL, &gpio_entry);
	}
	}

	static void cb_parse_vdat(unsigned char ptr, struct sysinfo_t info)
	{
	struct lb_range vdat = (struct lb_range ) ptr;

	info->vdat_addr = (void *)(uintptr_t)vdat->range_start;
	info->vdat_size = vdat->range_size;
	}

	static void cb_parse_tstamp(unsigned char ptr, struct sysinfo_t info)
	{
	struct cb_cbmem_tab const cbmem = (struct cb_cbmem_tab )ptr;
	info->tstamp_table = (void *)(uintptr_t)cbmem->cbmem_tab;

	TimestampTable table = (void )(uintptr_t)cbmem->cbmem_tab;
	FwdbEntry timestamp_table_entry = {
	.ptr = table,
	.size = offsetof(TimestampTable, entries) +
	table->max_entries * sizeof(TimestampEntry),
	};
	fwdb_access("timestamp table", NULL, &timestamp_table_entry);
	}

	static void cb_parse_cbmem_cons(unsigned char ptr, struct sysinfo_t info)
	{
	struct cb_cbmem_tab const cbmem = (struct cb_cbmem_tab )ptr;
	info->cbmem_cons = (void *)(uintptr_t)cbmem->cbmem_tab;
	}

	static void cb_parse_acpi_gnvs(unsigned char ptr, struct sysinfo_t info)
	{
	struct cb_cbmem_tab const cbmem = (struct cb_cbmem_tab )ptr;
	info->acpi_gnvs = (void *)(uintptr_t)cbmem->cbmem_tab;
	}

	static void cb_parse_board_id(unsigned char ptr, struct sysinfo_t info)
	{
	struct cb_board_id const cbbid = (struct cb_board_id )ptr;
	info->board_id = cbbid->board_id;
	}

	static void cb_parse_ram_code(unsigned char ptr, struct sysinfo_t info)
	{
	struct cb_ram_code const ram_code = (struct cb_ram_code )ptr;

	FwdbEntry ram_code_entry = {
	.ptr = &ram_code->ram_code,
	.size = sizeof(ram_code->ram_code),
	};
	fwdb_access("coreboot.ram_code", NULL, &ram_code_entry);
	}

	static void cb_parse_framebuffer(void ptr, struct sysinfo_t info)
	{
	struct cb_framebuffer *cbfb = ptr;
	FrameBuffer fb = {
	.header = {
	.version = FrameBufferCurrentVersion,
	},
	.buffer = (void *)(uintptr_t)cbfb->physical_address,
	.resolution = {
	.x = cbfb->x_resolution,
	.y = cbfb->y_resolution,
	},
	.bytes_per_line = cbfb->bytes_per_line,
	.bits_per_pixel = cbfb->bits_per_pixel,
	.red = {
	.pos = cbfb->red_mask_pos,
	.size = cbfb->red_mask_size & 0x7,
	},
	.green = {
	.pos = cbfb->green_mask_pos,
	.size = cbfb->green_mask_size & 0x7,
	},
	.blue = {
	.pos = cbfb->blue_mask_pos,
	.size = cbfb->blue_mask_size & 0x7,
	},
	};

	framebuffer_write_to_fwdb(&fb);
	}

	static void cb_parse_ramoops(void ptr, struct sysinfo_t info)
	{
	struct lb_range ramoops = (struct lb_range )ptr;

	info->ramoops_buffer = ramoops->range_start;
	info->ramoops_buffer_size = ramoops->range_size;
	}

	static void cb_parse_mtc(void ptr, struct sysinfo_t info)
	{
	struct lb_range mtc = (struct lb_range )ptr;

	info->mtc_start = mtc->range_start;
	info->mtc_size = mtc->range_size;
	}

	static void cb_parse_spi_flash(void ptr, struct sysinfo_t info)
	{
	struct cb_spi_flash flash = (struct cb_spi_flash )ptr;

	info->spi_flash.size = flash->flash_size;
	info->spi_flash.sector_size = flash->sector_size;
	info->spi_flash.erase_cmd = flash->erase_cmd;
	}

	static void cb_parse_boot_media_params(unsigned char *ptr,
	struct sysinfo_t *info)
	{
	struct cb_boot_media_params *const bmp =
	(struct cb_boot_media_params *)ptr;
	info->cbfs_offset = bmp->cbfs_offset;
	info->cbfs_size = bmp->cbfs_size;
	}

	int cb_parse_header(void addr, int len, struct sysinfo_t info)
	{
	struct cb_header *header;
	unsigned char *ptr = addr;
	void *forward;
	int i;

	for (i = 0; i < len; i += 16, ptr += 16) {
	header = (struct cb_header *)ptr;
	if (!strncmp((const char *)header->signature, "LBIO", 4))
	break;
	}

	/* We walked the entire space and didn't find anything. */
	if (i >= len)
	return -1;

	/* Make sure the checksums match. */
	if (ipchecksum((uint16_t )header, sizeof(header)) != 0)
	return -1;

	if (!header->table_bytes)
	return 0;

	if (ipchecksum((uint16_t )(ptr + sizeof(header)),
	header->table_bytes) != header->table_checksum)
	return -1;

	info->header = header;

	/*
	* Board straps represented by numerical values are small numbers.
	* Preset them to an invalid value in case the firmware does not
	* supply the info.
	*/
	info->board_id = ~0;

	/* Now, walk the tables. */
	ptr += header->header_bytes;

	for (i = 0; i < header->table_entries; i++) {
	struct cb_record rec = (struct cb_record )ptr;

	/* We only care about a few tags here (maybe more later). */
	switch (rec->tag) {
	case CB_TAG_FORWARD:
	forward = (void *)(uintptr_t)
	((struct cb_forward *)rec)->forward;
	return cb_parse_header(forward, len, info);
	continue;
	case CB_TAG_MEMORY:
	cb_parse_memory(ptr, info);
	break;
	case CB_TAG_FRAMEBUFFER:
	cb_parse_framebuffer(ptr, info);
	break;
	case CB_TAG_GPIO:
	cb_parse_gpios(ptr, info);
	break;
	case CB_TAG_VDAT:
	cb_parse_vdat(ptr, info);
	break;
	case CB_TAG_VBNV:
	cb_parse_vbnv(ptr, info);
	break;
	case CB_TAG_VBOOT_HANDOFF:
	cb_parse_vboot_handoff(ptr, info);
	break;
	case CB_TAG_TIMESTAMPS:
	cb_parse_tstamp(ptr, info);
	break;
	case CB_TAG_CBMEM_CONSOLE:
	cb_parse_cbmem_cons(ptr, info);
	break;
	case CB_TAG_ACPI_GNVS:
	cb_parse_acpi_gnvs(ptr, info);
	break;
	case CB_TAG_BOARD_ID:
	cb_parse_board_id(ptr, info);
	break;
	case CB_TAG_RAM_CODE:
	cb_parse_ram_code(ptr, info);
	break;
	case CB_TAG_RAM_OOPS:
	cb_parse_ramoops(ptr, info);
	break;
	case CB_TAG_SPI_FLASH:
	cb_parse_spi_flash(ptr, info);
	break;
	case CB_TAG_MTC:
	cb_parse_mtc(ptr, info);
	break;
	case CB_TAG_BOOT_MEDIA_PARAMS:
	cb_parse_boot_media_params(ptr, info);
	break;
	default:
	cb_parse_arch_specific(rec, info);
	break;
	}

	ptr += rec->size;
	}

	return 0;
	}