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-rw-r--r--src/Kconfig6
-rw-r--r--src/include/nhlt.h284
-rw-r--r--src/lib/Makefile.inc1
-rw-r--r--src/lib/nhlt.c421
4 files changed, 712 insertions, 0 deletions
diff --git a/src/Kconfig b/src/Kconfig
index f6702eadaf..6a0209dad3 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -613,6 +613,12 @@ config COMMON_FADT
bool
default n
+config ACPI_NHLT
+ bool
+ default n
+ help
+ Build support for NHLT (non HD Audio) ACPI table generation.
+
#These Options are here to avoid "undefined" warnings.
#The actual selection and help texts are in the following menu.
diff --git a/src/include/nhlt.h b/src/include/nhlt.h
new file mode 100644
index 0000000000..ca1669381c
--- /dev/null
+++ b/src/include/nhlt.h
@@ -0,0 +1,284 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google, Inc.
+ *
+ * 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.
+ */
+
+#ifndef _NHLT_H_
+#define _NHLT_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+struct nhlt;
+struct nhlt_endpoint;
+struct nhlt_format;
+struct nhlt_format_config;
+
+/*
+ * Non HD Audio ACPI support. This table is typically used for Intel Smart
+ * Sound Technology DSP. It provides a way to encode opaque settings in
+ * the ACPI tables.
+ *
+ * While the structure fields of the NHLT structs are exposed below
+ * the SoC/chipset code should be the only other user manipulating the
+ * fields directly aside from the library itself.
+ *
+ * The NHLT table consists of endpoints which in turn contain different
+ * supporting stream formats. Each endpoint may contain a device specific
+ * configuration payload as well as each stream format.
+ *
+ * Most code should use the SoC variants of the functions because
+ * there is required logic needed to be performed by the SoC. The SoC
+ * code should be abstracting the inner details of these functions that
+ * specically apply to NHLT objects for that SoC.
+ *
+ * An example sequence:
+ *
+ * nhlt = nhlt_init()
+ * ep = nhlt_soc_add_endpoint()
+ * nhlt_endpoint_append_config(ep)
+ * nhlt_endpoint_add_formats(ep)
+ * nhlt_soc_serialize()
+ */
+
+/* Obtain an nhlt object for adding endpoints. Returns NULL on error. */
+struct nhlt *nhlt_init(void);
+
+/* Return the size of the NHLT table including APCI header. */
+size_t nhlt_current_size(struct nhlt *nhlt);
+
+/*
+ * Add endpoint to NHLT object. Returns NULL on error.
+ *
+ * Note that the SoC variant uses SoC-specifc types for the hardware interface
+ * and device types. This is to allow the SoC code to validate its particular
+ * device support for specific hardware interfaces.
+ *
+ * The more generic nhlt_add_endpoint() is called by the SoC code to provide
+ * the specific assumptions/uses for NHLT for that platform. All fields
+ * are the NHLT enumerations found within this header file.
+ */
+struct nhlt_endpoint *nhlt_add_endpoint(struct nhlt *nhlt, int link_type,
+ int device_type, int dir,
+ uint16_t vid, uint16_t did);
+struct nhlt_endpoint *nhlt_soc_add_endpoint(struct nhlt *nhlt, int soc_hwintf,
+ int soc_devtype, int dir);
+
+/*
+ * Append blob of configuration to the endpoint proper. Returns 0 on
+ * success, < 0 on error. A copy of the configuration is made so any
+ * resources pointed to by config can be freed after the call.
+ */
+int nhlt_endpoint_append_config(struct nhlt_endpoint *endpoint,
+ const void *config, size_t config_sz);
+
+/* Add a format type to the provided endpoint. Returns NULL on error. */
+struct nhlt_format *nhlt_add_format(struct nhlt_endpoint *endpoint,
+ int num_channels,
+ int sample_freq_khz,
+ int container_bits_per_sample,
+ int valid_bits_per_sample,
+ uint32_t speaker_mask);
+
+/*
+ * Append blob of configuration to the format proper. Returns 0 on
+ * success, < 0 on error. A copy of the configuration is made so any
+ * resources pointed to by config can be freed after the call.
+ */
+int nhlt_format_append_config(struct nhlt_format *format, const void *config,
+ size_t config_sz);
+
+/*
+ * Add num_formats described by formats to the endpoint. This function
+ * effectively wraps nhlt_add_format() and nhlt_format_config() using the
+ * data found in each nhlt_format_config object. Returns 0 on success, < 0
+ * on error.
+ */
+int nhlt_endpoint_add_formats(struct nhlt_endpoint *endpoint,
+ const struct nhlt_format_config *formats,
+ size_t num_formats);
+
+/*
+ * Increment the instance id for a given link type. This function is
+ * used for marking a device being completely added to the NHLT object.
+ * Subsequent endpoints added to the nhlt object with the same link type
+ * will use incremented instance id.
+ */
+void nhlt_next_instance(struct nhlt *nhlt, int link_type);
+
+/*
+ * Serialize NHLT object to ACPI table. Take in the beginning address of where
+ * the table will reside and return the address of the next ACPI table. On
+ * error 0 will be returned. The NHLT object is no longer valid after this
+ * function is called.
+ */
+uintptr_t nhlt_serialize(struct nhlt *nhlt, uintptr_t acpi_addr);
+
+/*
+ * While very similar to nhlt_serialize() the SoC specific function allows
+ * the chipset to perform any needed accounting work such as updating ACPI
+ * field references for the serialized structure.
+ */
+uintptr_t nhlt_soc_serialize(struct nhlt *nhlt, uintptr_t acpi_addr);
+
+/* Link and device types. */
+enum {
+ NHLT_LINK_HDA,
+ NHLT_LINK_DSP,
+ NHLT_LINK_PDM,
+ NHLT_LINK_SSP,
+ NHLT_MAX_LINK_TYPES,
+};
+
+enum {
+ NHLT_SSP_DEV_BT, /* Bluetooth */
+ NHLT_SSP_DEV_MODEM,
+ NHLT_SSP_DEV_FM,
+ NHLT_SSP_DEV_RESERVED,
+ NHLT_SSP_DEV_I2S = 4,
+};
+
+enum {
+ NHLT_PDM_DEV,
+};
+
+/* Endpoint direction. */
+enum {
+ NHLT_DIR_RENDER,
+ NHLT_DIR_CAPTURE,
+ NHLT_DIR_BIDIRECTIONAL,
+};
+
+/* Channel Mask for an endpoint. While they are prefixed with 'SPEAKER' the
+ * channel masks are also used for capture devices. */
+enum {
+ SPEAKER_FRONT_LEFT = 1 << 0,
+ SPEAKER_FRONT_RIGHT = 1 << 1,
+ SPEAKER_FRONT_CENTER = 1 << 2,
+ SPEAKER_LOW_FREQUENCY = 1 << 3,
+ SPEAKER_BACK_LEFT = 1 << 4,
+ SPEAKER_BACK_RIGHT = 1 << 5,
+ SPEAKER_FRONT_LEFT_OF_CENTER = 1 << 6,
+ SPEAKER_FRONT_RIGHT_OF_CENTER = 1 << 7,
+ SPEAKER_BACK_CENTER = 1 << 8,
+ SPEAKER_SIDE_LEFT = 1 << 9,
+ SPEAKER_SIDE_RIGHT = 1 << 10,
+ SPEAKER_TOP_CENTER = 1 << 11,
+ SPEAKER_TOP_FRONT_LEFT = 1 << 12,
+ SPEAKER_TOP_FRONT_CENTER = 1 << 13,
+ SPEAKER_TOP_FRONT_RIGHT = 1 << 14,
+ SPEAKER_TOP_BACK_LEFT = 1 << 15,
+ SPEAKER_TOP_BACK_CENTER = 1 << 16,
+ SPEAKER_TOP_BACK_RIGHT = 1 << 17,
+};
+
+
+/* Supporting structures. Only SoC/chipset and the library code directly should
+ * be manipulating these structures. */
+struct sub_format {
+ uint32_t data1;
+ uint16_t data2;
+ uint16_t data3;
+ uint8_t data4[8];
+};
+
+struct nhlt_specific_config {
+ uint32_t size;
+ void *capabilities;
+};
+
+struct nhlt_waveform {
+ uint16_t tag;
+ uint16_t num_channels;
+ uint32_t samples_per_second;
+ uint32_t bytes_per_second;
+ uint16_t block_align;
+ uint16_t bits_per_sample;
+ uint16_t extra_size;
+ uint16_t valid_bits_per_sample;
+ uint32_t channel_mask;
+ struct sub_format sub_format;
+};
+
+struct nhlt_format {
+ struct nhlt_waveform waveform;
+ struct nhlt_specific_config config;
+};
+
+/*
+ * This struct is used by nhlt_endpoint_add_formats() for easily adding
+ * waveform formats with associated settings file.
+ */
+struct nhlt_format_config {
+ int num_channels;
+ int sample_freq_khz;
+ int container_bits_per_sample;
+ int valid_bits_per_sample;
+ uint32_t speaker_mask;
+ const char *settings_file;
+};
+
+/* Arbitrary max number of formats per endpoint. */
+#define MAX_FORMATS 2
+struct nhlt_endpoint {
+ uint32_t length;
+ uint8_t link_type;
+ uint8_t instance_id;
+ uint16_t vendor_id;
+ uint16_t device_id;
+ uint16_t revision_id;
+ uint32_t subsystem_id;
+ uint8_t device_type;
+ uint8_t direction;
+ uint8_t virtual_bus_id;
+ struct nhlt_specific_config config;
+ uint8_t num_formats;
+ struct nhlt_format formats[MAX_FORMATS];
+};
+
+#define MAX_ENDPOINTS 8
+struct nhlt {
+ uint8_t num_endpoints;
+ struct nhlt_endpoint endpoints[MAX_ENDPOINTS];
+ uint8_t current_instance_id[NHLT_MAX_LINK_TYPES];
+};
+
+struct nhlt_tdm_config {
+ uint8_t virtual_slot;
+ uint8_t config_type;
+};
+
+enum {
+ NHLT_TDM_BASIC,
+ NHLT_TDM_MIC_ARRAY,
+};
+
+struct nhlt_dmic_array_config {
+ struct nhlt_tdm_config tdm_config;
+ uint8_t array_type;
+};
+
+/*
+ * Microphone array definitions may be found here:
+ * https://msdn.microsoft.com/en-us/library/windows/hardware/dn613960%28v=vs.85%29.aspx
+ */
+enum {
+ NHLT_MIC_ARRAY_2CH_SMALL = 0xa,
+ NHLT_MIC_ARRAY_2CH_BIG = 0xb,
+ NHLT_MIC_ARRAY_4CH_1ST_GEOM = 0xc,
+ NHLT_MIC_ARRAY_4CH_L_SHAPED = 0xd,
+ NHLT_MIC_ARRAY_4CH_2ND_GEOM = 0xe,
+ NHLT_MIC_ARRAY_VENDOR_DEFINED = 0xf,
+};
+
+#endif
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index 724391fb21..11db6550ea 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -125,6 +125,7 @@ ramstage-$(CONFIG_TIMER_QUEUE) += timer_queue.c
ramstage-$(CONFIG_GENERIC_GPIO_LIB) += gpio.c
ramstage-$(CONFIG_GENERIC_UDELAY) += timer.c
ramstage-y += b64_decode.c
+ramstage-$(CONFIG_ACPI_NHLT) += nhlt.c
romstage-y += cbmem_common.c
romstage-y += imd_cbmem.c
diff --git a/src/lib/nhlt.c b/src/lib/nhlt.c
new file mode 100644
index 0000000000..4fa4a0c2c1
--- /dev/null
+++ b/src/lib/nhlt.c
@@ -0,0 +1,421 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google, Inc.
+ *
+ * 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.
+ */
+
+#include <arch/acpi.h>
+#include <cbfs.h>
+#include <commonlib/endian.h>
+#include <console/console.h>
+#include <nhlt.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define NHLT_RID 1
+#define NHLT_SSID 1
+#define WAVEFORMAT_TAG 0xfffe
+
+static const struct sub_format pcm_subformat = {
+ .data1 = 0x00000001,
+ .data2 = 0x0000,
+ .data3 = 0x0010,
+ .data4 = { 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 },
+};
+
+struct nhlt *nhlt_init(void)
+{
+ struct nhlt *nhlt;
+
+ nhlt = malloc(sizeof(*nhlt));
+
+ if (nhlt == NULL)
+ return NULL;
+
+ memset(nhlt, 0, sizeof(*nhlt));
+
+ return nhlt;
+}
+
+struct nhlt_endpoint *nhlt_add_endpoint(struct nhlt *nhlt, int link_type,
+ int device_type, int dir,
+ uint16_t vid, uint16_t did)
+{
+ struct nhlt_endpoint *endp;
+
+ if (link_type < NHLT_LINK_HDA || link_type >= NHLT_MAX_LINK_TYPES)
+ return NULL;
+
+ if (nhlt->num_endpoints >= MAX_ENDPOINTS)
+ return NULL;
+
+ endp = &nhlt->endpoints[nhlt->num_endpoints];
+
+ endp->link_type = link_type;
+ endp->instance_id = nhlt->current_instance_id[link_type];
+ endp->vendor_id = vid;
+ endp->device_id = did;
+ endp->revision_id = NHLT_RID;
+ endp->subsystem_id = NHLT_SSID;
+ endp->device_type = device_type;
+ endp->direction = dir;
+ endp->virtual_bus_id = 0;
+
+ nhlt->num_endpoints++;
+
+ return endp;
+}
+
+static int append_specific_config(struct nhlt_specific_config *spec_cfg,
+ const void *config, size_t config_sz)
+{
+ size_t new_sz;
+ void *new_cfg;
+
+ if (config == NULL || config_sz == 0)
+ return 0;
+
+ new_sz = spec_cfg->size + config_sz;
+
+ new_cfg = malloc(new_sz);
+
+ if (new_cfg == NULL)
+ return -1;
+
+ /* Append new config. */
+ memcpy(new_cfg, spec_cfg->capabilities, spec_cfg->size);
+ memcpy(new_cfg + spec_cfg->size, config, config_sz);
+
+ free(spec_cfg->capabilities);
+
+ /* Update with new config data. */
+ spec_cfg->size = new_sz;
+ spec_cfg->capabilities = new_cfg;
+
+ return 0;
+}
+
+int nhlt_endpoint_append_config(struct nhlt_endpoint *endp, const void *config,
+ size_t config_sz)
+{
+ return append_specific_config(&endp->config, config, config_sz);
+}
+
+struct nhlt_format *nhlt_add_format(struct nhlt_endpoint *endp,
+ int num_channels,
+ int sample_freq_khz,
+ int container_bits_per_sample,
+ int valid_bits_per_sample,
+ uint32_t speaker_mask)
+{
+ struct nhlt_format *fmt;
+ struct nhlt_waveform *wave;
+
+ if (endp->num_formats >= MAX_FORMATS)
+ return NULL;
+
+ fmt = &endp->formats[endp->num_formats];
+ wave = &fmt->waveform;
+
+ wave->tag = WAVEFORMAT_TAG;
+ wave->num_channels = num_channels;
+ wave->samples_per_second = sample_freq_khz * KHz;
+ wave->bits_per_sample = container_bits_per_sample;
+ wave->extra_size = sizeof(wave->valid_bits_per_sample);
+ wave->extra_size += sizeof(wave->channel_mask);
+ wave->extra_size += sizeof(wave->sub_format);
+ wave->valid_bits_per_sample = valid_bits_per_sample;
+ wave->channel_mask = speaker_mask;
+ memcpy(&wave->sub_format, &pcm_subformat, sizeof(wave->sub_format));
+
+ /* Calculate the dervied fields. */
+ wave->block_align = wave->num_channels * wave->bits_per_sample / 8;
+ wave->bytes_per_second = wave->block_align * wave->samples_per_second;
+
+ endp->num_formats++;
+
+ return fmt;
+}
+
+int nhlt_format_append_config(struct nhlt_format *fmt, const void *config,
+ size_t config_sz)
+{
+ return append_specific_config(&fmt->config, config, config_sz);
+}
+
+int nhlt_endpoint_add_formats(struct nhlt_endpoint *endp,
+ const struct nhlt_format_config *formats,
+ size_t num_formats)
+{
+ size_t i;
+
+ for (i = 0; i < num_formats; i++) {
+ struct nhlt_format *fmt;
+ struct cbfsf file;
+ struct region_device settings;
+ void *settings_data;
+ const struct nhlt_format_config *cfg = &formats[i];
+
+ fmt = nhlt_add_format(endp, cfg->num_channels,
+ cfg->sample_freq_khz,
+ cfg->container_bits_per_sample,
+ cfg->valid_bits_per_sample,
+ cfg->speaker_mask);
+
+ if (fmt == NULL)
+ return -1;
+
+ if (cfg->settings_file == NULL)
+ continue;
+
+ /* Find the settings file in CBFS and place it in format. */
+ if (cbfs_boot_locate(&file, cfg->settings_file, NULL))
+ return -1;
+
+ cbfs_file_data(&settings, &file);
+
+ settings_data = rdev_mmap_full(&settings);
+
+ if (settings_data == NULL)
+ return -1;
+
+ if (nhlt_format_append_config(fmt, settings_data,
+ region_device_sz(&settings))) {
+ rdev_munmap(&settings, settings_data);
+ return -1;
+ }
+
+ rdev_munmap(&settings, settings_data);
+ }
+
+ return 0;
+}
+
+void nhlt_next_instance(struct nhlt *nhlt, int link_type)
+{
+ if (link_type < NHLT_LINK_HDA || link_type >= NHLT_MAX_LINK_TYPES)
+ return;
+
+ nhlt->current_instance_id[link_type]++;
+}
+
+static size_t calc_specific_config_size(struct nhlt_specific_config *cfg)
+{
+ return sizeof(cfg->size) + cfg->size;
+}
+
+static size_t calc_format_size(struct nhlt_format *fmt)
+{
+ size_t sz = 0;
+
+ /* Wave format first. */
+ sz += sizeof(fmt->waveform.tag);
+ sz += sizeof(fmt->waveform.num_channels);
+ sz += sizeof(fmt->waveform.samples_per_second);
+ sz += sizeof(fmt->waveform.bytes_per_second);
+ sz += sizeof(fmt->waveform.block_align);
+ sz += sizeof(fmt->waveform.bits_per_sample);
+ sz += sizeof(fmt->waveform.extra_size);
+ sz += sizeof(fmt->waveform.valid_bits_per_sample);
+ sz += sizeof(fmt->waveform.channel_mask);
+ sz += sizeof(fmt->waveform.sub_format);
+
+ sz += calc_specific_config_size(&fmt->config);
+
+ return sz;
+}
+
+static size_t calc_endpoint_size(struct nhlt_endpoint *endp)
+{
+ int i;
+ size_t sz = 0;
+
+ sz += sizeof(endp->length) + sizeof(endp->link_type);
+ sz += sizeof(endp->instance_id) + sizeof(endp->vendor_id);
+ sz += sizeof(endp->device_id) + sizeof(endp->revision_id);
+ sz += sizeof(endp->subsystem_id) + sizeof(endp->device_type);
+ sz += sizeof(endp->direction) + sizeof(endp->virtual_bus_id);
+ sz += calc_specific_config_size(&endp->config);
+ sz += sizeof(endp->num_formats);
+
+ for (i = 0; i < endp->num_formats; i++)
+ sz += calc_format_size(&endp->formats[i]);
+
+ /* Adjust endpoint length to reflect current configuration. */
+ endp->length = sz;
+
+ return sz;
+}
+
+static size_t calc_endpoints_size(struct nhlt *nhlt)
+{
+ int i;
+ size_t sz = 0;
+
+ for (i = 0; i < nhlt->num_endpoints; i++)
+ sz += calc_endpoint_size(&nhlt->endpoints[i]);
+
+ return sz;
+}
+
+static size_t calc_size(struct nhlt *nhlt)
+{
+ return sizeof(nhlt->num_endpoints) + calc_endpoints_size(nhlt);
+}
+
+size_t nhlt_current_size(struct nhlt *nhlt)
+{
+ return calc_size(nhlt) + sizeof(acpi_header_t);
+}
+
+static void nhlt_free_resources(struct nhlt *nhlt)
+{
+ int i;
+ int j;
+
+ /* Free all specific configs. */
+ for (i = 0; i < nhlt->num_endpoints; i++) {
+ struct nhlt_endpoint *endp = &nhlt->endpoints[i];
+
+ free(endp->config.capabilities);
+ for (j = 0; j < endp->num_formats; j++) {
+ struct nhlt_format *fmt = &endp->formats[j];
+
+ free(fmt->config.capabilities);
+ }
+ }
+
+ /* Free nhlt object proper. */
+ free(nhlt);
+}
+
+struct cursor {
+ uint8_t *buf;
+};
+
+static void ser8(struct cursor *cur, uint8_t val)
+{
+ write_le8(cur->buf, val);
+ cur->buf += sizeof(val);
+}
+
+static void ser16(struct cursor *cur, uint16_t val)
+{
+ write_le16(cur->buf, val);
+ cur->buf += sizeof(val);
+}
+
+static void ser32(struct cursor *cur, uint32_t val)
+{
+ write_le32(cur->buf, val);
+ cur->buf += sizeof(val);
+}
+
+static void serblob(struct cursor *cur, void *from, size_t sz)
+{
+ memcpy(cur->buf, from, sz);
+ cur->buf += sz;
+}
+
+static void serialize_specific_config(struct nhlt_specific_config *cfg,
+ struct cursor *cur)
+{
+ ser32(cur, cfg->size);
+ serblob(cur, cfg->capabilities, cfg->size);
+}
+
+static void serialize_waveform(struct nhlt_waveform *wave, struct cursor *cur)
+{
+ ser16(cur, wave->tag);
+ ser16(cur, wave->num_channels);
+ ser32(cur, wave->samples_per_second);
+ ser32(cur, wave->bytes_per_second);
+ ser16(cur, wave->block_align);
+ ser16(cur, wave->bits_per_sample);
+ ser16(cur, wave->extra_size);
+ ser16(cur, wave->valid_bits_per_sample);
+ ser32(cur, wave->channel_mask);
+ ser32(cur, wave->sub_format.data1);
+ ser16(cur, wave->sub_format.data2);
+ ser16(cur, wave->sub_format.data3);
+ serblob(cur, wave->sub_format.data4, sizeof(wave->sub_format.data4));
+}
+
+static void serialize_format(struct nhlt_format *fmt, struct cursor *cur)
+{
+ serialize_waveform(&fmt->waveform, cur);
+ serialize_specific_config(&fmt->config, cur);
+}
+
+static void serialize_endpoint(struct nhlt_endpoint *endp, struct cursor *cur)
+{
+ int i;
+
+ ser32(cur, endp->length);
+ ser8(cur, endp->link_type);
+ ser8(cur, endp->instance_id);
+ ser16(cur, endp->vendor_id);
+ ser16(cur, endp->device_id);
+ ser16(cur, endp->revision_id);
+ ser32(cur, endp->subsystem_id);
+ ser8(cur, endp->device_type);
+ ser8(cur, endp->direction);
+ ser8(cur, endp->virtual_bus_id);
+ serialize_specific_config(&endp->config, cur);
+ ser8(cur, endp->num_formats);
+
+ for (i = 0; i < endp->num_formats; i++)
+ serialize_format(&endp->formats[i], cur);
+}
+
+static void nhlt_serialize_endpoints(struct nhlt *nhlt, struct cursor *cur)
+{
+ int i;
+
+ ser8(cur, nhlt->num_endpoints);
+
+ for (i = 0; i < nhlt->num_endpoints; i++)
+ serialize_endpoint(&nhlt->endpoints[i], cur);
+}
+
+uintptr_t nhlt_serialize(struct nhlt *nhlt, uintptr_t acpi_addr)
+{
+ struct cursor cur;
+ acpi_header_t *header;
+ size_t sz;
+
+ printk(BIOS_DEBUG, "ACPI: * NHLT\n");
+
+ sz = nhlt_current_size(nhlt);
+
+ /* Create header */
+ header = (void *)acpi_addr;
+ memset(header, 0, sizeof(acpi_header_t));
+ memcpy(header->signature, "NHLT", 4);
+ write_le32(&header->length, sz);
+ write_le8(&header->revision, 5);
+ memcpy(header->oem_id, OEM_ID, 6);
+ memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
+ memcpy(header->asl_compiler_id, ASLC, 4);
+
+ cur.buf = (void *)(acpi_addr + sizeof(acpi_header_t));
+ nhlt_serialize_endpoints(nhlt, &cur);
+
+ write_le8(&header->checksum, acpi_checksum((void *)header, sz));
+
+ nhlt_free_resources(nhlt);
+
+ acpi_addr += sz;
+ acpi_addr = ALIGN_UP(acpi_addr, 16);
+
+ return acpi_addr;
+}