From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757084AbXGPSBr (ORCPT ); Mon, 16 Jul 2007 14:01:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758193AbXGPSBL (ORCPT ); Mon, 16 Jul 2007 14:01:11 -0400 Received: from smtp-out.google.com ([216.239.45.13]:56680 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758056AbXGPSBH (ORCPT ); Mon, 16 Jul 2007 14:01:07 -0400 DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=received:date:from:to:cc:subject:message-id:mime-version: content-type:content-disposition:user-agent; b=KEgpJuVwW9iRngJQRWD8AwfQVYIgRD1DEQ4EURJrqCe4mF2mTuyzd6zCb1d+wVAu8 /nHCh8hc/SBiSis1rEt/g== Date: Mon, 16 Jul 2007 11:00:19 -0700 From: Aaron Durbin To: linux-kernel@vger.kernel.org Cc: linux-acpi@vger.kernel.org, len.brown@intel.com, ak@suse.de, akpm@osdl.org Subject: [PATCH] ACPI: Add reboot mechanism Message-ID: <20070716180019.GA5112@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Add the ability to reset the machine using the RESET_REG in ACPI's FADT table. Signed-off-by: Aaron Durbin --- diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index d4336f1..c9906a5 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -21,7 +21,7 @@ obj-$(CONFIG_X86) += blacklist.o # # ACPI Core Subsystem (Interpreter) # -obj-y += osl.o utils.o \ +obj-y += osl.o utils.o reboot.o \ dispatcher/ events/ executer/ hardware/ \ namespace/ parser/ resources/ tables/ \ utilities/ diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c new file mode 100644 index 0000000..4bb4d3e --- /dev/null +++ b/drivers/acpi/reboot.c @@ -0,0 +1,45 @@ + +#include +#include + +void acpi_reboot(void) +{ + struct acpi_generic_address *rr; + struct pci_bus *bus0; + u8 reset_value; + unsigned int devfn; + + rr = &acpi_gbl_FADT.reset_register; + + /* Is the reset register supported? */ + if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || + rr->bit_width != 8 || rr->bit_offset != 0) + return; + + reset_value = acpi_gbl_FADT.reset_value; + + /* The reset register can only exist in I/O, Memory or PCI config space + * on a device on bus 0. */ + switch (rr->space_id) { + case ACPI_ADR_SPACE_PCI_CONFIG: + /* The reset register can only live on bus 0. */ + bus0 = pci_find_bus(0, 0); + if (!bus0) + return; + /* Form PCI device/function pair. */ + devfn = PCI_DEVFN((rr->address >> 32) & 0xffff, + (rr->address >> 16) & 0xffff); + printk(KERN_DEBUG "Resetting with ACPI PCI RESET_REG."); + /* Write the value that resets us. */ + pci_bus_write_config_byte(bus0, devfn, + (rr->address & 0xffff), reset_value); + break; + + case ACPI_ADR_SPACE_SYSTEM_MEMORY: + case ACPI_ADR_SPACE_SYSTEM_IO: + printk(KERN_DEBUG "ACPI MEMORY or I/O RESET_REG."); + acpi_hw_low_level_write(8, reset_value, rr); + break; + } +} + diff --git a/include/acpi/reboot.h b/include/acpi/reboot.h new file mode 100644 index 0000000..1d8da79 --- /dev/null +++ b/include/acpi/reboot.h @@ -0,0 +1,10 @@ +#ifndef __ACPI_REBOOT_H +#define __ACPI_REBOOT_H + +#ifdef CONFIG_ACPI +extern void acpi_reboot(void); +#else +#define acpi_reboot() +#endif + +#endif