src/mainboard/asrock/e350m1/acpi_tables.c - chromiumos/third_party/coreboot - Git at Google

 /*
  * This file is part of the coreboot project.
  *
  * Copyright (C) 2011 Advanced Micro Devices, 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.
  *
  * 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 <string.h>
 #include <arch/acpi.h>
 #include <arch/acpigen.h>
 #include <arch/ioapic.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>
 #include <cpu/x86/msr.h>
 #include "agesawrapper.h"
 #include <cpu/amd/mtrr.h>
 #include <cpu/amd/amdfam14.h>

 #define DUMP_ACPI_TABLES 0

 #if DUMP_ACPI_TABLES == 1

 static void dump_mem(u32 start, u32 end)
 {

 	u32 i;
 	print_debug("dump_mem:");
 	for (i = start; i < end; i++) {
 		if ((i & 0xf) == 0) {
 			printk(BIOS_DEBUG, "\n%08x:", i);
 		}
 		printk(BIOS_DEBUG, " %02x", (u8)*((u8 *)i));
 	}
 	print_debug("\n");
 }
 #endif

 extern const unsigned char AmlCode[];

 unsigned long acpi_fill_ssdt_generator(unsigned long current, const char *oem_table_id)
 {
 	int lens;
 	msr_t msr;
 	char pscope[] = "\\_SB.PCI0";

 	lens = acpigen_write_scope(pscope);
 	msr = rdmsr(TOP_MEM);
 	lens += acpigen_write_name_dword("TOM1", msr.lo);
 	msr = rdmsr(TOP_MEM2);
 	/*
 	 * Since XP only implements parts of ACPI 2.0, we can't use a qword
 	 * here.
 	 * See http://www.acpi.info/presentations/S01USMOBS169_OS%2520new.ppt
 	 * slide 22ff.
 	 * Shift value right by 20 bit to make it fit into 32bit,
 	 * giving us 1MB granularity and a limit of almost 4Exabyte of memory.
 	 */
 	lens += acpigen_write_name_dword("TOM2", (msr.hi << 12) | msr.lo >> 20);
 	acpigen_patch_len(lens - 1);
 	return (unsigned long) (acpigen_get_current());
 }

 unsigned long acpi_fill_mcfg(unsigned long current)
 {
 	/* Just a dummy */
 	return current;
 }

 unsigned long acpi_fill_madt(unsigned long current)
 {
 	/* create all subtables for processors */
 	current = acpi_create_madt_lapics(current);

 	/* Write SB800 IOAPIC, only one */
 	current += acpi_create_madt_ioapic((acpi_madt_ioapic_t *) current,
 			CONFIG_MAX_CPUS, IO_APIC_ADDR, 0);

 	current += acpi_create_madt_irqoverride((acpi_madt_irqoverride_t *)
 			current, 0, 0, 2, 0);
 	current += acpi_create_madt_irqoverride((acpi_madt_irqoverride_t *)
 			current, 0, 9, 9, 0xF);

 	/* 0: mean bus 0--->ISA */
 	/* 0: PIC 0 */
 	/* 2: APIC 2 */
 	/* 5 mean: 0101 --> Edige-triggered, Active high */

 	/* create all subtables for processors */
 	/* current = acpi_create_madt_lapic_nmis(current, 5, 1); */
 	/* 1: LINT1 connect to NMI */

 	return current;
 }

 unsigned long acpi_fill_hest(acpi_hest_t *hest)
 {
 	void *addr, *current;

 	/* Skip the HEST header. */
 	current = (void *)(hest + 1);

 	addr = agesawrapper_getlateinitptr(PICK_WHEA_MCE);
 	if (addr != NULL)
 		current += acpi_create_hest_error_source(hest, current, 0, (void *)((u32)addr + 2), *(UINT16 *)addr - 2);

 	addr = agesawrapper_getlateinitptr(PICK_WHEA_CMC);
 	if (addr != NULL)
 		current += acpi_create_hest_error_source(hest, current, 1, (void *)((u32)addr + 2), *(UINT16 *)addr - 2);

 	return (unsigned long)current;
 }

 unsigned long acpi_fill_slit(unsigned long current)
 {
 	// Not implemented
 	return current;
 }

 unsigned long acpi_fill_srat(unsigned long current)
 {
 	/* No NUMA, no SRAT */
 	return current;
 }

 unsigned long write_acpi_tables(unsigned long start)
 {
 	unsigned long current;
 	acpi_rsdp_t *rsdp;
 	acpi_rsdt_t *rsdt;
 	acpi_hpet_t *hpet;
 	acpi_madt_t *madt;
 	acpi_srat_t *srat;
 	acpi_slit_t *slit;
 	acpi_fadt_t *fadt;
 	acpi_facs_t *facs;
 	acpi_header_t *dsdt;
 	acpi_header_t *ssdt;
 	acpi_header_t *ssdt2;
 	acpi_header_t *alib;
 	acpi_hest_t *hest;

 	get_bus_conf(); /* it will get sblk, pci1234, hcdn, and sbdn */

 	/* Align ACPI tables to 16 bytes */
 	start = ALIGN(start, 16);
 	current = start;

 	printk(BIOS_INFO, "ACPI: Writing ACPI tables at %lx...\n", start);

 	/* We need at least an RSDP and an RSDT Table */
 	rsdp = (acpi_rsdp_t *) current;
 	current += sizeof(acpi_rsdp_t);
 	rsdt = (acpi_rsdt_t *) current;
 	current += sizeof(acpi_rsdt_t);

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

 	acpi_write_rsdp(rsdp, rsdt, NULL);
 	acpi_write_rsdt(rsdt);

 	/* DSDT */
 	current = ALIGN(current, 8);
 	printk(BIOS_DEBUG, "ACPI:  * DSDT at %lx\n", current);
 	dsdt = (acpi_header_t *)current;
 	memcpy(dsdt, &AmlCode, sizeof(acpi_header_t));
 	current += dsdt->length;
 	memcpy(dsdt, &AmlCode, dsdt->length);
 	printk(BIOS_DEBUG, "ACPI:  * DSDT @ %p Length %x\n",dsdt,dsdt->length);

 	/* FACS */ // it needs 64 bit alignment
 	current = ALIGN(current, 8);
 	printk(BIOS_DEBUG, "ACPI:  * FACS at %lx\n", current);
 	facs = (acpi_facs_t *) current;
 	current += sizeof(acpi_facs_t);
 	acpi_create_facs(facs);

 	/* FADT */
 	current = ALIGN(current, 8);
 	printk(BIOS_DEBUG, "ACPI:  * FADT at %lx\n", current);
 	fadt = (acpi_fadt_t *) current;
 	current += sizeof(acpi_fadt_t);

 	acpi_create_fadt(fadt, facs, dsdt);
 	acpi_add_table(rsdp, fadt);

 	/*
 	 * We explicitly add these tables later on:
 	 */
 	current = ALIGN(current, 8);
 	printk(BIOS_DEBUG, "ACPI:  * HPET at %lx\n", current);
 	hpet = (acpi_hpet_t *) current;
 	current += sizeof(acpi_hpet_t);
 	acpi_create_hpet(hpet);
 	acpi_add_table(rsdp, hpet);

 	/* If we want to use HPET Timers Linux wants an MADT */
 	current = ALIGN(current, 8);
 	printk(BIOS_DEBUG, "ACPI:  * MADT at %lx\n",current);
 	madt = (acpi_madt_t *) current;
 	acpi_create_madt(madt);
 	current += madt->header.length;
 	acpi_add_table(rsdp, madt);

 	/* HEST */
 	current = ALIGN(current, 8);
 	hest = (acpi_hest_t *)current;
 	acpi_write_hest((void *)current);
 	acpi_add_table(rsdp, (void *)current);
 	current += ((acpi_header_t *)current)->length;

 	/* SRAT */
 	current = ALIGN(current, 8);
 	printk(BIOS_DEBUG, "ACPI:  * SRAT at %lx\n", current);
 	srat = (acpi_srat_t *) agesawrapper_getlateinitptr (PICK_SRAT);
 	if (srat != NULL) {
 		memcpy((void *)current, srat, srat->header.length);
 		srat = (acpi_srat_t *) current;
 		current += srat->header.length;
 		acpi_add_table(rsdp, srat);
 	}
 	else {
 		printk(BIOS_DEBUG, "  AGESA SRAT table NULL. Skipping.\n");
 	}

 	/* SLIT */
 	current = ALIGN(current, 8);
 	printk(BIOS_DEBUG, "ACPI:  * SLIT at %lx\n", current);
 	slit = (acpi_slit_t *) agesawrapper_getlateinitptr (PICK_SLIT);
 	if (slit != NULL) {
 		memcpy((void *)current, slit, slit->header.length);
 		slit = (acpi_slit_t *) current;
 		current += slit->header.length;
 		acpi_add_table(rsdp, slit);
 	}
 	else {
 		printk(BIOS_DEBUG, "  AGESA SLIT table NULL. Skipping.\n");
 	}

 	/* SSDT */
 	current = ALIGN(current, 16);
 	printk(BIOS_DEBUG, "ACPI:  * AGESA ALIB SSDT at %lx\n", current);
 	alib = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_ALIB);
 	if (alib != NULL) {
 		memcpy((void *)current, alib, alib->length);
 		alib = (acpi_header_t *) current;
 		current += alib->length;
 		acpi_add_table(rsdp, (void *)alib);
 	} else {
 		printk(BIOS_DEBUG, "	AGESA ALIB SSDT table NULL. Skipping.\n");
 	}

 	/* The DSDT needs additional work for the AGESA SSDT Pstate table */
 	/* Keep the comment for a while. */
 	current = ALIGN(current, 16);
 	printk(BIOS_DEBUG, "ACPI:  * AGESA SSDT Pstate at %lx\n", current);
 	ssdt = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_PSTATE);
 	if (ssdt != NULL) {
 		memcpy((void *)current, ssdt, ssdt->length);
 		ssdt = (acpi_header_t *) current;
 		current += ssdt->length;
 		acpi_add_table(rsdp,ssdt);
 	} else {
 		printk(BIOS_DEBUG, "  AGESA SSDT Pstate table NULL. Skipping.\n");
 	}

 	current = ALIGN(current, 16);
 	printk(BIOS_DEBUG, "ACPI:  * coreboot TOM SSDT2 at %lx\n", current);
 	ssdt2 = (acpi_header_t *) current;
 	acpi_create_ssdt_generator(ssdt2, ACPI_TABLE_CREATOR);
 	current += ssdt2->length;
 	acpi_add_table(rsdp,ssdt2);

 #if DUMP_ACPI_TABLES == 1
 	printk(BIOS_DEBUG, "rsdp\n");
 	dump_mem(rsdp, ((void *)rsdp) + sizeof(acpi_rsdp_t));

 	printk(BIOS_DEBUG, "rsdt\n");
 	dump_mem(rsdt, ((void *)rsdt) + sizeof(acpi_rsdt_t));

 	printk(BIOS_DEBUG, "madt\n");
 	dump_mem(madt, ((void *)madt) + madt->header.length);

 	printk(BIOS_DEBUG, "srat\n");
 	dump_mem(srat, ((void *)srat) + srat->header.length);

 	printk(BIOS_DEBUG, "slit\n");
 	dump_mem(slit, ((void *)slit) + slit->header.length);

 	printk(BIOS_DEBUG, "alib\n");
 	dump_mem(ssdt, ((void *)alib) + alib->length);

 	printk(BIOS_DEBUG, "ssdt\n");
 	dump_mem(ssdt, ((void *)ssdt) + ssdt->length);

 	printk(BIOS_DEBUG, "ssdt2\n");
 	dump_mem(ssdt2, ((void *)ssdt2) + ssdt2->length);

 	printk(BIOS_DEBUG, "fadt\n");
 	dump_mem(fadt, ((void *)fadt) + fadt->header.length);

 	printk(BIOS_DEBUG, "hest\n");
 	dump_mem(hest, ((void *)hest) + hest->header.length);
 #endif

 	printk(BIOS_INFO, "ACPI: done.\n");
 	return current;
 }
	/*
	* This file is part of the coreboot project.
	*
	* Copyright (C) 2011 Advanced Micro Devices, 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.
	*
	* 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 <string.h>
	#include <arch/acpi.h>
	#include <arch/acpigen.h>
	#include <arch/ioapic.h>
	#include <device/pci.h>
	#include <device/pci_ids.h>
	#include <cpu/x86/msr.h>
	#include "agesawrapper.h"
	#include <cpu/amd/mtrr.h>
	#include <cpu/amd/amdfam14.h>

	#define DUMP_ACPI_TABLES 0

	#if DUMP_ACPI_TABLES == 1

	static void dump_mem(u32 start, u32 end)
	{

	u32 i;
	print_debug("dump_mem:");
	for (i = start; i < end; i++) {
	if ((i & 0xf) == 0) {
	printk(BIOS_DEBUG, "\n%08x:", i);
	}
	printk(BIOS_DEBUG, " %02x", (u8)((u8 )i));
	}
	print_debug("\n");
	}
	#endif

	extern const unsigned char AmlCode[];

	unsigned long acpi_fill_ssdt_generator(unsigned long current, const char *oem_table_id)
	{
	int lens;
	msr_t msr;
	char pscope[] = "\\_SB.PCI0";

	lens = acpigen_write_scope(pscope);
	msr = rdmsr(TOP_MEM);
	lens += acpigen_write_name_dword("TOM1", msr.lo);
	msr = rdmsr(TOP_MEM2);
	/*
	* Since XP only implements parts of ACPI 2.0, we can't use a qword
	* here.
	* See http://www.acpi.info/presentations/S01USMOBS169_OS%2520new.ppt
	* slide 22ff.
	* Shift value right by 20 bit to make it fit into 32bit,
	* giving us 1MB granularity and a limit of almost 4Exabyte of memory.
	*/
	lens += acpigen_write_name_dword("TOM2", (msr.hi << 12) \| msr.lo >> 20);
	acpigen_patch_len(lens - 1);
	return (unsigned long) (acpigen_get_current());
	}

	unsigned long acpi_fill_mcfg(unsigned long current)
	{
	/* Just a dummy */
	return current;
	}

	unsigned long acpi_fill_madt(unsigned long current)
	{
	/* create all subtables for processors */
	current = acpi_create_madt_lapics(current);

	/* Write SB800 IOAPIC, only one */
	current += acpi_create_madt_ioapic((acpi_madt_ioapic_t *) current,
	CONFIG_MAX_CPUS, IO_APIC_ADDR, 0);

	current += acpi_create_madt_irqoverride((acpi_madt_irqoverride_t *)
	current, 0, 0, 2, 0);
	current += acpi_create_madt_irqoverride((acpi_madt_irqoverride_t *)
	current, 0, 9, 9, 0xF);

	/* 0: mean bus 0--->ISA */
	/* 0: PIC 0 */
	/* 2: APIC 2 */
	/* 5 mean: 0101 --> Edige-triggered, Active high */

	/* create all subtables for processors */
	/* current = acpi_create_madt_lapic_nmis(current, 5, 1); */
	/* 1: LINT1 connect to NMI */

	return current;
	}

	unsigned long acpi_fill_hest(acpi_hest_t *hest)
	{
	void addr, current;

	/* Skip the HEST header. */
	current = (void *)(hest + 1);

	addr = agesawrapper_getlateinitptr(PICK_WHEA_MCE);
	if (addr != NULL)
	current += acpi_create_hest_error_source(hest, current, 0, (void )((u32)addr + 2), (UINT16 *)addr - 2);

	addr = agesawrapper_getlateinitptr(PICK_WHEA_CMC);
	if (addr != NULL)
	current += acpi_create_hest_error_source(hest, current, 1, (void )((u32)addr + 2), (UINT16 *)addr - 2);

	return (unsigned long)current;
	}

	unsigned long acpi_fill_slit(unsigned long current)
	{
	// Not implemented
	return current;
	}

	unsigned long acpi_fill_srat(unsigned long current)
	{
	/* No NUMA, no SRAT */
	return current;
	}

	unsigned long write_acpi_tables(unsigned long start)
	{
	unsigned long current;
	acpi_rsdp_t *rsdp;
	acpi_rsdt_t *rsdt;
	acpi_hpet_t *hpet;
	acpi_madt_t *madt;
	acpi_srat_t *srat;
	acpi_slit_t *slit;
	acpi_fadt_t *fadt;
	acpi_facs_t *facs;
	acpi_header_t *dsdt;
	acpi_header_t *ssdt;
	acpi_header_t *ssdt2;
	acpi_header_t *alib;
	acpi_hest_t *hest;

	get_bus_conf(); /* it will get sblk, pci1234, hcdn, and sbdn */

	/* Align ACPI tables to 16 bytes */
	start = ALIGN(start, 16);
	current = start;

	printk(BIOS_INFO, "ACPI: Writing ACPI tables at %lx...\n", start);

	/* We need at least an RSDP and an RSDT Table */
	rsdp = (acpi_rsdp_t *) current;
	current += sizeof(acpi_rsdp_t);
	rsdt = (acpi_rsdt_t *) current;
	current += sizeof(acpi_rsdt_t);

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

	acpi_write_rsdp(rsdp, rsdt, NULL);
	acpi_write_rsdt(rsdt);

	/* DSDT */
	current = ALIGN(current, 8);
	printk(BIOS_DEBUG, "ACPI: * DSDT at %lx\n", current);
	dsdt = (acpi_header_t *)current;
	memcpy(dsdt, &AmlCode, sizeof(acpi_header_t));
	current += dsdt->length;
	memcpy(dsdt, &AmlCode, dsdt->length);
	printk(BIOS_DEBUG, "ACPI: * DSDT @ %p Length %x\n",dsdt,dsdt->length);

	/* FACS */ // it needs 64 bit alignment
	current = ALIGN(current, 8);
	printk(BIOS_DEBUG, "ACPI: * FACS at %lx\n", current);
	facs = (acpi_facs_t *) current;
	current += sizeof(acpi_facs_t);
	acpi_create_facs(facs);

	/* FADT */
	current = ALIGN(current, 8);
	printk(BIOS_DEBUG, "ACPI: * FADT at %lx\n", current);
	fadt = (acpi_fadt_t *) current;
	current += sizeof(acpi_fadt_t);

	acpi_create_fadt(fadt, facs, dsdt);
	acpi_add_table(rsdp, fadt);

	/*
	* We explicitly add these tables later on:
	*/
	current = ALIGN(current, 8);
	printk(BIOS_DEBUG, "ACPI: * HPET at %lx\n", current);
	hpet = (acpi_hpet_t *) current;
	current += sizeof(acpi_hpet_t);
	acpi_create_hpet(hpet);
	acpi_add_table(rsdp, hpet);

	/* If we want to use HPET Timers Linux wants an MADT */
	current = ALIGN(current, 8);
	printk(BIOS_DEBUG, "ACPI: * MADT at %lx\n",current);
	madt = (acpi_madt_t *) current;
	acpi_create_madt(madt);
	current += madt->header.length;
	acpi_add_table(rsdp, madt);

	/* HEST */
	current = ALIGN(current, 8);
	hest = (acpi_hest_t *)current;
	acpi_write_hest((void *)current);
	acpi_add_table(rsdp, (void *)current);
	current += ((acpi_header_t *)current)->length;

	/* SRAT */
	current = ALIGN(current, 8);
	printk(BIOS_DEBUG, "ACPI: * SRAT at %lx\n", current);
	srat = (acpi_srat_t *) agesawrapper_getlateinitptr (PICK_SRAT);
	if (srat != NULL) {
	memcpy((void *)current, srat, srat->header.length);
	srat = (acpi_srat_t *) current;
	current += srat->header.length;
	acpi_add_table(rsdp, srat);
	}
	else {
	printk(BIOS_DEBUG, " AGESA SRAT table NULL. Skipping.\n");
	}

	/* SLIT */
	current = ALIGN(current, 8);
	printk(BIOS_DEBUG, "ACPI: * SLIT at %lx\n", current);
	slit = (acpi_slit_t *) agesawrapper_getlateinitptr (PICK_SLIT);
	if (slit != NULL) {
	memcpy((void *)current, slit, slit->header.length);
	slit = (acpi_slit_t *) current;
	current += slit->header.length;
	acpi_add_table(rsdp, slit);
	}
	else {
	printk(BIOS_DEBUG, " AGESA SLIT table NULL. Skipping.\n");
	}

	/* SSDT */
	current = ALIGN(current, 16);
	printk(BIOS_DEBUG, "ACPI: * AGESA ALIB SSDT at %lx\n", current);
	alib = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_ALIB);
	if (alib != NULL) {
	memcpy((void *)current, alib, alib->length);
	alib = (acpi_header_t *) current;
	current += alib->length;
	acpi_add_table(rsdp, (void *)alib);
	} else {
	printk(BIOS_DEBUG, " AGESA ALIB SSDT table NULL. Skipping.\n");
	}

	/* The DSDT needs additional work for the AGESA SSDT Pstate table */
	/* Keep the comment for a while. */
	current = ALIGN(current, 16);
	printk(BIOS_DEBUG, "ACPI: * AGESA SSDT Pstate at %lx\n", current);
	ssdt = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_PSTATE);
	if (ssdt != NULL) {
	memcpy((void *)current, ssdt, ssdt->length);
	ssdt = (acpi_header_t *) current;
	current += ssdt->length;
	acpi_add_table(rsdp,ssdt);
	} else {
	printk(BIOS_DEBUG, " AGESA SSDT Pstate table NULL. Skipping.\n");
	}

	current = ALIGN(current, 16);
	printk(BIOS_DEBUG, "ACPI: * coreboot TOM SSDT2 at %lx\n", current);
	ssdt2 = (acpi_header_t *) current;
	acpi_create_ssdt_generator(ssdt2, ACPI_TABLE_CREATOR);
	current += ssdt2->length;
	acpi_add_table(rsdp,ssdt2);

	#if DUMP_ACPI_TABLES == 1
	printk(BIOS_DEBUG, "rsdp\n");
	dump_mem(rsdp, ((void *)rsdp) + sizeof(acpi_rsdp_t));

	printk(BIOS_DEBUG, "rsdt\n");
	dump_mem(rsdt, ((void *)rsdt) + sizeof(acpi_rsdt_t));

	printk(BIOS_DEBUG, "madt\n");
	dump_mem(madt, ((void *)madt) + madt->header.length);

	printk(BIOS_DEBUG, "srat\n");
	dump_mem(srat, ((void *)srat) + srat->header.length);

	printk(BIOS_DEBUG, "slit\n");
	dump_mem(slit, ((void *)slit) + slit->header.length);

	printk(BIOS_DEBUG, "alib\n");
	dump_mem(ssdt, ((void *)alib) + alib->length);

	printk(BIOS_DEBUG, "ssdt\n");
	dump_mem(ssdt, ((void *)ssdt) + ssdt->length);

	printk(BIOS_DEBUG, "ssdt2\n");
	dump_mem(ssdt2, ((void *)ssdt2) + ssdt2->length);

	printk(BIOS_DEBUG, "fadt\n");
	dump_mem(fadt, ((void *)fadt) + fadt->header.length);

	printk(BIOS_DEBUG, "hest\n");
	dump_mem(hest, ((void *)hest) + hest->header.length);
	#endif

	printk(BIOS_INFO, "ACPI: done.\n");
	return current;
	}