[J-u-boot.git] / lib / acpi / acpi_table.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Generic code used to generate ACPI tables
 *
 * Copyright 2019 Google LLC
 */

#include <common.h>
#include <dm.h>
#include <cpu.h>
#include <log.h>
#include <mapmem.h>
#include <tables_csum.h>
#include <timestamp.h>
#include <version.h>
#include <acpi/acpi_table.h>
#include <asm/global_data.h>
#include <dm/acpi.h>

/*
 * OEM_REVISION is 32-bit unsigned number. It should be increased only when
 * changing software version. Therefore it should not depend on build time.
 * U-Boot calculates it from U-Boot version and represent it in hexadecimal
 * notation. As U-Boot version is in form year.month set low 8 bits to 0x01
 * to have valid date. So for U-Boot version 2021.04 OEM_REVISION is set to
 * value 0x20210401.
 */
#define OEM_REVISION ((((U_BOOT_VERSION_NUM / 1000) % 10) << 28) | \
		      (((U_BOOT_VERSION_NUM / 100) % 10) << 24) | \
		      (((U_BOOT_VERSION_NUM / 10) % 10) << 20) | \
		      ((U_BOOT_VERSION_NUM % 10) << 16) | \
		      (((U_BOOT_VERSION_NUM_PATCH / 10) % 10) << 12) | \
		      ((U_BOOT_VERSION_NUM_PATCH % 10) << 8) | \
		      0x01)

int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags)
{
	struct acpi_table_header *header = &dmar->header;
	struct cpu_info info;
	struct udevice *cpu;
	int ret;

	ret = uclass_first_device(UCLASS_CPU, &cpu);
	if (ret)
		return log_msg_ret("cpu", ret);
	ret = cpu_get_info(cpu, &info);
	if (ret)
		return log_msg_ret("info", ret);
	memset((void *)dmar, 0, sizeof(struct acpi_dmar));

	/* Fill out header fields. */
	acpi_fill_header(&dmar->header, "DMAR");
	header->length = sizeof(struct acpi_dmar);
	header->revision = acpi_get_table_revision(ACPITAB_DMAR);

	dmar->host_address_width = info.address_width - 1;
	dmar->flags = flags;

	return 0;
}

int acpi_get_table_revision(enum acpi_tables table)
{
	switch (table) {
	case ACPITAB_FADT:
		return ACPI_FADT_REV_ACPI_3_0;
	case ACPITAB_MADT:
		return ACPI_MADT_REV_ACPI_3_0;
	case ACPITAB_MCFG:
		return ACPI_MCFG_REV_ACPI_3_0;
	case ACPITAB_TCPA:
		/* This version and the rest are open-coded */
		return 2;
	case ACPITAB_TPM2:
		return 4;
	case ACPITAB_SSDT: /* ACPI 3.0 upto 6.3: 2 */
		return 2;
	case ACPITAB_SRAT: /* ACPI 2.0: 1, ACPI 3.0: 2, ACPI 4.0 to 6.3: 3 */
		return 1; /* TODO Should probably be upgraded to 2 */
	case ACPITAB_DMAR:
		return 1;
	case ACPITAB_SLIT: /* ACPI 2.0 upto 6.3: 1 */
		return 1;
	case ACPITAB_SPMI: /* IMPI 2.0 */
		return 5;
	case ACPITAB_HPET: /* Currently 1. Table added in ACPI 2.0 */
		return 1;
	case ACPITAB_VFCT: /* ACPI 2.0/3.0/4.0: 1 */
		return 1;
	case ACPITAB_IVRS:
		return IVRS_FORMAT_FIXED;
	case ACPITAB_DBG2:
		return 0;
	case ACPITAB_FACS: /* ACPI 2.0/3.0: 1, ACPI 4.0 to 6.3: 2 */
		return 1;
	case ACPITAB_RSDT: /* ACPI 1.0 upto 6.3: 1 */
		return 1;
	case ACPITAB_XSDT: /* ACPI 2.0 upto 6.3: 1 */
		return 1;
	case ACPITAB_RSDP: /* ACPI 2.0 upto 6.3: 2 */
		return 2;
	case ACPITAB_HEST:
		return 1;
	case ACPITAB_NHLT:
		return 5;
	case ACPITAB_BERT:
		return 1;
	case ACPITAB_SPCR:
		return 2;
	default:
		return -EINVAL;
	}
}

void acpi_fill_header(struct acpi_table_header *header, char *signature)
{
	memcpy(header->signature, signature, 4);
	memcpy(header->oem_id, OEM_ID, 6);
	memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
	header->oem_revision = OEM_REVISION;
	memcpy(header->aslc_id, ASLC_ID, 4);
}

void acpi_align(struct acpi_ctx *ctx)
{
	ctx->current = (void *)ALIGN((ulong)ctx->current, 16);
}

void acpi_align64(struct acpi_ctx *ctx)
{
	ctx->current = (void *)ALIGN((ulong)ctx->current, 64);
}

void acpi_inc(struct acpi_ctx *ctx, uint amount)
{
	ctx->current += amount;
}

void acpi_inc_align(struct acpi_ctx *ctx, uint amount)
{
	ctx->current += amount;
	acpi_align(ctx);
}

/**
 * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
 * and checksum.
 */
int acpi_add_table(struct acpi_ctx *ctx, void *table)
{
	int i, entries_num;
	struct acpi_rsdt *rsdt;
	struct acpi_xsdt *xsdt;

	/* The RSDT is mandatory while the XSDT is not */
	rsdt = ctx->rsdt;

	/* This should always be MAX_ACPI_TABLES */
	entries_num = ARRAY_SIZE(rsdt->entry);

	for (i = 0; i < entries_num; i++) {
		if (rsdt->entry[i] == 0)
			break;
	}

	if (i >= entries_num) {
		log_err("ACPI: Error: too many tables\n");
		return -E2BIG;
	}

	/* Add table to the RSDT */
	rsdt->entry[i] = map_to_sysmem(table);

	/* Fix RSDT length or the kernel will assume invalid entries */
	rsdt->header.length = sizeof(struct acpi_table_header) +
				(sizeof(u32) * (i + 1));

	/* Re-calculate checksum */
	rsdt->header.checksum = 0;
	rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
						       rsdt->header.length);

	/*
	 * And now the same thing for the XSDT. We use the same index as for
	 * now we want the XSDT and RSDT to always be in sync in U-Boot
	 */
	xsdt = ctx->xsdt;

	/* Add table to the XSDT */
	xsdt->entry[i] = map_to_sysmem(table);

	/* Fix XSDT length */
	xsdt->header.length = sizeof(struct acpi_table_header) +
				(sizeof(u64) * (i + 1));

	/* Re-calculate checksum */
	xsdt->header.checksum = 0;
	xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
						       xsdt->header.length);

	return 0;
}

void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
		     struct acpi_xsdt *xsdt)
{
	memset(rsdp, 0, sizeof(struct acpi_rsdp));

	memcpy(rsdp->signature, RSDP_SIG, 8);
	memcpy(rsdp->oem_id, OEM_ID, 6);

	rsdp->length = sizeof(struct acpi_rsdp);
	rsdp->rsdt_address = map_to_sysmem(rsdt);

	rsdp->xsdt_address = map_to_sysmem(xsdt);
	rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;

	/* Calculate checksums */
	rsdp->checksum = table_compute_checksum(rsdp, 20);
	rsdp->ext_checksum = table_compute_checksum(rsdp,
						    sizeof(struct acpi_rsdp));
}

static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
{
	struct acpi_table_header *header = &rsdt->header;

	/* Fill out header fields */
	acpi_fill_header(header, "RSDT");
	header->length = sizeof(struct acpi_rsdt);
	header->revision = 1;

	/* Entries are filled in later, we come with an empty set */

	/* Fix checksum */
	header->checksum = table_compute_checksum(rsdt,
						  sizeof(struct acpi_rsdt));
}

static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
{
	struct acpi_table_header *header = &xsdt->header;

	/* Fill out header fields */
	acpi_fill_header(header, "XSDT");
	header->length = sizeof(struct acpi_xsdt);
	header->revision = 1;

	/* Entries are filled in later, we come with an empty set */

	/* Fix checksum */
	header->checksum = table_compute_checksum(xsdt,
						  sizeof(struct acpi_xsdt));
}

void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start)
{
	ctx->base = start;
	ctx->current = start;

	/* Align ACPI tables to 16 byte */
	acpi_align(ctx);
	gd->arch.acpi_start = map_to_sysmem(ctx->current);

	/* We need at least an RSDP and an RSDT Table */
	ctx->rsdp = ctx->current;
	acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
	ctx->rsdt = ctx->current;
	acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
	ctx->xsdt = ctx->current;
	acpi_inc_align(ctx, sizeof(struct acpi_xsdt));

	/* clear all table memory */
	memset((void *)start, '\0', ctx->current - start);

	acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
	acpi_write_rsdt(ctx->rsdt);
	acpi_write_xsdt(ctx->xsdt);
	/*
	 * Per ACPI spec, the FACS table address must be aligned to a 64 byte
	 * boundary (Windows checks this, but Linux does not).
	 */
	acpi_align64(ctx);
}

void acpi_create_dbg2(struct acpi_dbg2_header *dbg2,
		      int port_type, int port_subtype,
		      struct acpi_gen_regaddr *address, u32 address_size,
		      const char *device_path)
{
	uintptr_t current;
	struct acpi_dbg2_device *device;
	u32 *dbg2_addr_size;
	struct acpi_table_header *header;
	size_t path_len;
	const char *path;
	char *namespace;

	/* Fill out header fields. */
	current = (uintptr_t)dbg2;
	memset(dbg2, '\0', sizeof(struct acpi_dbg2_header));
	header = &dbg2->header;

	header->revision = acpi_get_table_revision(ACPITAB_DBG2);
	acpi_fill_header(header, "DBG2");
	header->aslc_revision = ASL_REVISION;

	/* One debug device defined */
	dbg2->devices_offset = sizeof(struct acpi_dbg2_header);
	dbg2->devices_count = 1;
	current += sizeof(struct acpi_dbg2_header);

	/* Device comes after the header */
	device = (struct acpi_dbg2_device *)current;
	memset(device, 0, sizeof(struct acpi_dbg2_device));
	current += sizeof(struct acpi_dbg2_device);

	device->revision = 0;
	device->address_count = 1;
	device->port_type = port_type;
	device->port_subtype = port_subtype;

	/* Base Address comes after device structure */
	memcpy((void *)current, address, sizeof(struct acpi_gen_regaddr));
	device->base_address_offset = current - (uintptr_t)device;
	current += sizeof(struct acpi_gen_regaddr);

	/* Address Size comes after address structure */
	dbg2_addr_size = (uint32_t *)current;
	device->address_size_offset = current - (uintptr_t)device;
	*dbg2_addr_size = address_size;
	current += sizeof(uint32_t);

	/* Namespace string comes last, use '.' if not provided */
	path = device_path ? : ".";
	/* Namespace string length includes NULL terminator */
	path_len = strlen(path) + 1;
	namespace = (char *)current;
	device->namespace_string_length = path_len;
	device->namespace_string_offset = current - (uintptr_t)device;
	strncpy(namespace, path, path_len);
	current += path_len;

	/* Update structure lengths and checksum */
	device->length = current - (uintptr_t)device;
	header->length = current - (uintptr_t)dbg2;
	header->checksum = table_compute_checksum(dbg2, header->length);
}
Commit	Line	Data
91fe8b79 SG	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Generic code used to generate ACPI tables
	4	*
	5	* Copyright 2019 Google LLC
	6	*/
	7
	8	#include <common.h>
bfeb5d46 SG	9	#include <dm.h>
bfeb5d46 SG	10	#include <cpu.h>
f7ae49fc	11	#include <log.h>
29b35112 SG	12	#include <mapmem.h>
29b35112 SG	13	#include <tables_csum.h>
121a165c	14	#include <timestamp.h>
93f7f827	15	#include <version.h>
86e1778d	16	#include <acpi/acpi_table.h>
401d1c4f	17	#include <asm/global_data.h>
86e1778d	18	#include <dm/acpi.h>
bfeb5d46	19
a3423b3f T	20	/*
	21	* OEM_REVISION is 32-bit unsigned number. It should be increased only when
	22	* changing software version. Therefore it should not depend on build time.
	23	* U-Boot calculates it from U-Boot version and represent it in hexadecimal
	24	* notation. As U-Boot version is in form year.month set low 8 bits to 0x01
	25	* to have valid date. So for U-Boot version 2021.04 OEM_REVISION is set to
	26	* value 0x20210401.
	27	*/
	28	#define OEM_REVISION ((((U_BOOT_VERSION_NUM / 1000) % 10) << 28) \| \
	29	(((U_BOOT_VERSION_NUM / 100) % 10) << 24) \| \
	30	(((U_BOOT_VERSION_NUM / 10) % 10) << 20) \| \
	31	((U_BOOT_VERSION_NUM % 10) << 16) \| \
	32	(((U_BOOT_VERSION_NUM_PATCH / 10) % 10) << 12) \| \
	33	((U_BOOT_VERSION_NUM_PATCH % 10) << 8) \| \
	34	0x01)
	35
bfeb5d46 SG	36	int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags)
	37	{
	38	struct acpi_table_header *header = &dmar->header;
	39	struct cpu_info info;
	40	struct udevice *cpu;
	41	int ret;
	42
	43	ret = uclass_first_device(UCLASS_CPU, &cpu);
	44	if (ret)
	45	return log_msg_ret("cpu", ret);
	46	ret = cpu_get_info(cpu, &info);
	47	if (ret)
	48	return log_msg_ret("info", ret);
	49	memset((void *)dmar, 0, sizeof(struct acpi_dmar));
	50
	51	/* Fill out header fields. */
	52	acpi_fill_header(&dmar->header, "DMAR");
	53	header->length = sizeof(struct acpi_dmar);
	54	header->revision = acpi_get_table_revision(ACPITAB_DMAR);
	55
	56	dmar->host_address_width = info.address_width - 1;
	57	dmar->flags = flags;
	58
	59	return 0;
	60	}
91fe8b79 SG	61
	62	int acpi_get_table_revision(enum acpi_tables table)
	63	{
	64	switch (table) {
	65	case ACPITAB_FADT:
	66	return ACPI_FADT_REV_ACPI_3_0;
	67	case ACPITAB_MADT:
	68	return ACPI_MADT_REV_ACPI_3_0;
	69	case ACPITAB_MCFG:
	70	return ACPI_MCFG_REV_ACPI_3_0;
	71	case ACPITAB_TCPA:
	72	/* This version and the rest are open-coded */
	73	return 2;
	74	case ACPITAB_TPM2:
	75	return 4;
	76	case ACPITAB_SSDT: /* ACPI 3.0 upto 6.3: 2 */
	77	return 2;
	78	case ACPITAB_SRAT: /* ACPI 2.0: 1, ACPI 3.0: 2, ACPI 4.0 to 6.3: 3 */
	79	return 1; /* TODO Should probably be upgraded to 2 */
	80	case ACPITAB_DMAR:
	81	return 1;
	82	case ACPITAB_SLIT: /* ACPI 2.0 upto 6.3: 1 */
	83	return 1;
	84	case ACPITAB_SPMI: /* IMPI 2.0 */
	85	return 5;
	86	case ACPITAB_HPET: /* Currently 1. Table added in ACPI 2.0 */
	87	return 1;
	88	case ACPITAB_VFCT: /* ACPI 2.0/3.0/4.0: 1 */
	89	return 1;
	90	case ACPITAB_IVRS:
	91	return IVRS_FORMAT_FIXED;
	92	case ACPITAB_DBG2:
	93	return 0;
	94	case ACPITAB_FACS: /* ACPI 2.0/3.0: 1, ACPI 4.0 to 6.3: 2 */
	95	return 1;
	96	case ACPITAB_RSDT: /* ACPI 1.0 upto 6.3: 1 */
	97	return 1;
	98	case ACPITAB_XSDT: /* ACPI 2.0 upto 6.3: 1 */
	99	return 1;
	100	case ACPITAB_RSDP: /* ACPI 2.0 upto 6.3: 2 */
	101	return 2;
	102	case ACPITAB_HEST:
	103	return 1;
	104	case ACPITAB_NHLT:
	105	return 5;
	106	case ACPITAB_BERT:
	107	return 1;
	108	case ACPITAB_SPCR:
	109	return 2;
	110	default:
	111	return -EINVAL;
	112	}
	113	}
93f7f827 SG	114
	115	void acpi_fill_header(struct acpi_table_header header, char signature)
	116	{
	117	memcpy(header->signature, signature, 4);
	118	memcpy(header->oem_id, OEM_ID, 6);
	119	memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
a3423b3f	120	header->oem_revision = OEM_REVISION;
93f7f827 SG	121	memcpy(header->aslc_id, ASLC_ID, 4);
93f7f827 SG	122	}
86e1778d SG	123
	124	void acpi_align(struct acpi_ctx *ctx)
	125	{
	126	ctx->current = (void *)ALIGN((ulong)ctx->current, 16);
	127	}
	128
	129	void acpi_align64(struct acpi_ctx *ctx)
	130	{
	131	ctx->current = (void *)ALIGN((ulong)ctx->current, 64);
	132	}
	133
	134	void acpi_inc(struct acpi_ctx *ctx, uint amount)
	135	{
	136	ctx->current += amount;
	137	}
	138
	139	void acpi_inc_align(struct acpi_ctx *ctx, uint amount)
	140	{
	141	ctx->current += amount;
	142	acpi_align(ctx);
	143	}
29b35112 SG	144
	145	/**
	146	* Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
	147	* and checksum.
	148	*/
	149	int acpi_add_table(struct acpi_ctx ctx, void table)
	150	{
	151	int i, entries_num;
	152	struct acpi_rsdt *rsdt;
	153	struct acpi_xsdt *xsdt;
	154
	155	/* The RSDT is mandatory while the XSDT is not */
	156	rsdt = ctx->rsdt;
	157
	158	/* This should always be MAX_ACPI_TABLES */
	159	entries_num = ARRAY_SIZE(rsdt->entry);
	160
	161	for (i = 0; i < entries_num; i++) {
	162	if (rsdt->entry[i] == 0)
	163	break;
	164	}
	165
	166	if (i >= entries_num) {
	167	log_err("ACPI: Error: too many tables\n");
	168	return -E2BIG;
	169	}
	170
	171	/* Add table to the RSDT */
	172	rsdt->entry[i] = map_to_sysmem(table);
	173
	174	/* Fix RSDT length or the kernel will assume invalid entries */
	175	rsdt->header.length = sizeof(struct acpi_table_header) +
	176	(sizeof(u32) * (i + 1));
	177
	178	/* Re-calculate checksum */
	179	rsdt->header.checksum = 0;
	180	rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
	181	rsdt->header.length);
	182
	183	/*
	184	* And now the same thing for the XSDT. We use the same index as for
	185	* now we want the XSDT and RSDT to always be in sync in U-Boot
	186	*/
b38309b7	187	xsdt = ctx->xsdt;
29b35112 SG	188
	189	/* Add table to the XSDT */
	190	xsdt->entry[i] = map_to_sysmem(table);
	191
	192	/* Fix XSDT length */
	193	xsdt->header.length = sizeof(struct acpi_table_header) +
	194	(sizeof(u64) * (i + 1));
	195
	196	/* Re-calculate checksum */
	197	xsdt->header.checksum = 0;
	198	xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
	199	xsdt->header.length);
	200
	201	return 0;
	202	}
7e586f69	203
d2cb7a22 SG	204	void acpi_write_rsdp(struct acpi_rsdp rsdp, struct acpi_rsdt rsdt,
d2cb7a22 SG	205	struct acpi_xsdt *xsdt)
7e586f69 SG	206	{
	207	memset(rsdp, 0, sizeof(struct acpi_rsdp));
	208
	209	memcpy(rsdp->signature, RSDP_SIG, 8);
	210	memcpy(rsdp->oem_id, OEM_ID, 6);
	211
	212	rsdp->length = sizeof(struct acpi_rsdp);
	213	rsdp->rsdt_address = map_to_sysmem(rsdt);
	214
	215	rsdp->xsdt_address = map_to_sysmem(xsdt);
	216	rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
	217
	218	/* Calculate checksums */
	219	rsdp->checksum = table_compute_checksum(rsdp, 20);
	220	rsdp->ext_checksum = table_compute_checksum(rsdp,
	221	sizeof(struct acpi_rsdp));
	222	}
	223
	224	static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
	225	{
	226	struct acpi_table_header *header = &rsdt->header;
	227
	228	/* Fill out header fields */
	229	acpi_fill_header(header, "RSDT");
	230	header->length = sizeof(struct acpi_rsdt);
	231	header->revision = 1;
	232
	233	/* Entries are filled in later, we come with an empty set */
	234
	235	/* Fix checksum */
	236	header->checksum = table_compute_checksum(rsdt,
	237	sizeof(struct acpi_rsdt));
	238	}
	239
	240	static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
	241	{
	242	struct acpi_table_header *header = &xsdt->header;
	243
	244	/* Fill out header fields */
	245	acpi_fill_header(header, "XSDT");
	246	header->length = sizeof(struct acpi_xsdt);
	247	header->revision = 1;
	248
	249	/* Entries are filled in later, we come with an empty set */
	250
	251	/* Fix checksum */
	252	header->checksum = table_compute_checksum(xsdt,
	253	sizeof(struct acpi_xsdt));
	254	}
	255
	256	void acpi_setup_base_tables(struct acpi_ctx ctx, void start)
	257	{
61cc9339	258	ctx->base = start;
7e586f69 SG	259	ctx->current = start;
	260
	261	/* Align ACPI tables to 16 byte */
	262	acpi_align(ctx);
0b885bcf	263	gd->arch.acpi_start = map_to_sysmem(ctx->current);
7e586f69 SG	264
	265	/* We need at least an RSDP and an RSDT Table */
	266	ctx->rsdp = ctx->current;
	267	acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
	268	ctx->rsdt = ctx->current;
	269	acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
b38309b7	270	ctx->xsdt = ctx->current;
7e586f69 SG	271	acpi_inc_align(ctx, sizeof(struct acpi_xsdt));
	272
	273	/* clear all table memory */
	274	memset((void *)start, '\0', ctx->current - start);
	275
b38309b7	276	acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
7e586f69	277	acpi_write_rsdt(ctx->rsdt);
b38309b7	278	acpi_write_xsdt(ctx->xsdt);
7e586f69 SG	279	/*
	280	* Per ACPI spec, the FACS table address must be aligned to a 64 byte
	281	* boundary (Windows checks this, but Linux does not).
	282	*/
	283	acpi_align64(ctx);
	284	}
f37979e7 SG	285
	286	void acpi_create_dbg2(struct acpi_dbg2_header *dbg2,
	287	int port_type, int port_subtype,
	288	struct acpi_gen_regaddr *address, u32 address_size,
	289	const char *device_path)
	290	{
	291	uintptr_t current;
	292	struct acpi_dbg2_device *device;
	293	u32 *dbg2_addr_size;
	294	struct acpi_table_header *header;
	295	size_t path_len;
	296	const char *path;
	297	char *namespace;
	298
	299	/* Fill out header fields. */
	300	current = (uintptr_t)dbg2;
	301	memset(dbg2, '\0', sizeof(struct acpi_dbg2_header));
	302	header = &dbg2->header;
	303
	304	header->revision = acpi_get_table_revision(ACPITAB_DBG2);
	305	acpi_fill_header(header, "DBG2");
	306	header->aslc_revision = ASL_REVISION;
	307
	308	/* One debug device defined */
	309	dbg2->devices_offset = sizeof(struct acpi_dbg2_header);
	310	dbg2->devices_count = 1;
	311	current += sizeof(struct acpi_dbg2_header);
	312
	313	/* Device comes after the header */
	314	device = (struct acpi_dbg2_device *)current;
	315	memset(device, 0, sizeof(struct acpi_dbg2_device));
	316	current += sizeof(struct acpi_dbg2_device);
	317
	318	device->revision = 0;
	319	device->address_count = 1;
	320	device->port_type = port_type;
	321	device->port_subtype = port_subtype;
	322
	323	/* Base Address comes after device structure */
	324	memcpy((void *)current, address, sizeof(struct acpi_gen_regaddr));
	325	device->base_address_offset = current - (uintptr_t)device;
	326	current += sizeof(struct acpi_gen_regaddr);
	327
	328	/* Address Size comes after address structure */
	329	dbg2_addr_size = (uint32_t *)current;
	330	device->address_size_offset = current - (uintptr_t)device;
	331	*dbg2_addr_size = address_size;
	332	current += sizeof(uint32_t);
	333
	334	/* Namespace string comes last, use '.' if not provided */
	335	path = device_path ? : ".";
	336	/* Namespace string length includes NULL terminator */
	337	path_len = strlen(path) + 1;
	338	namespace = (char *)current;
	339	device->namespace_string_length = path_len;
	340	device->namespace_string_offset = current - (uintptr_t)device;
	341	strncpy(namespace, path, path_len);
	342	current += path_len;
	343
	344	/* Update structure lengths and checksum */
	345	device->length = current - (uintptr_t)device;
	346	header->length = current - (uintptr_t)dbg2;
	347	header->checksum = table_compute_checksum(dbg2, header->length);
	348	}