fs/no-block.c


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/* no-block.c: implementation of routines required for non-BLOCK configuration
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/fs.h>

static int no_blkdev_open(struct inode * inode, struct file * filp)
{
	return -ENODEV;
}

const struct file_operations def_blk_fops = {
	.open		= no_blkdev_open,
	.llseek		= noop_llseek,
};
/******************************************************************************
 *
 * Name: actbl.h - Basic ACPI Table Definitions
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2016, Intel Corp.
 * All rights reserved.
 *
 * 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,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 */

#ifndef __ACTBL_H__
#define __ACTBL_H__

/*******************************************************************************
 *
 * Fundamental ACPI tables
 *
 * This file contains definitions for the ACPI tables that are directly consumed
 * by ACPICA. All other tables are consumed by the OS-dependent ACPI-related
 * device drivers and other OS support code.
 *
 * The RSDP and FACS do not use the common ACPI table header. All other ACPI
 * tables use the header.
 *
 ******************************************************************************/

/*
 * Values for description table header signatures for tables defined in this
 * file. Useful because they make it more difficult to inadvertently type in
 * the wrong signature.
 */
#define ACPI_SIG_DSDT           "DSDT"	/* Differentiated System Description Table */
#define ACPI_SIG_FADT           "FACP"	/* Fixed ACPI Description Table */
#define ACPI_SIG_FACS           "FACS"	/* Firmware ACPI Control Structure */
#define ACPI_SIG_OSDT           "OSDT"	/* Override System Description Table */
#define ACPI_SIG_PSDT           "PSDT"	/* Persistent System Description Table */
#define ACPI_SIG_RSDP           "RSD PTR "	/* Root System Description Pointer */
#define ACPI_SIG_RSDT           "RSDT"	/* Root System Description Table */
#define ACPI_SIG_XSDT           "XSDT"	/* Extended  System Description Table */
#define ACPI_SIG_SSDT           "SSDT"	/* Secondary System Description Table */
#define ACPI_RSDP_NAME          "RSDP"	/* Short name for RSDP, not signature */

/*
 * All tables and structures must be byte-packed to match the ACPI
 * specification, since the tables are provided by the system BIOS
 */
#pragma pack(1)

/*
 * Note: C bitfields are not used for this reason:
 *
 * "Bitfields are great and easy to read, but unfortunately the C language
 * does not specify the layout of bitfields in memory, which means they are
 * essentially useless for dealing with packed data in on-disk formats or
 * binary wire protocols." (Or ACPI tables and buffers.) "If you ask me,
 * this decision was a design error in C. Ritchie could have picked an order
 * and stuck with it." Norman Ramsey.
 * See http://stackoverflow.com/a/1053662/41661
 */

/*******************************************************************************
 *
 * Master ACPI Table Header. This common header is used by all ACPI tables
 * except the RSDP and FACS.
 *
 ******************************************************************************/

struct acpi_table_header {
	char signature[ACPI_NAME_SIZE];	/* ASCII table signature */
	u32 length;		/* Length of table in bytes, including this header */
	u8 revision;		/* ACPI Specification minor version number */
	u8 checksum;		/* To make sum of entire table == 0 */
	char oem_id[ACPI_OEM_ID_SIZE];	/* ASCII OEM identification */
	char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];	/* ASCII OEM table identification */
	u32 oem_revision;	/* OEM revision number */
	char asl_compiler_id[ACPI_NAME_SIZE];	/* ASCII ASL compiler vendor ID */
	u32 asl_compiler_revision;	/* ASL compiler version */
};

/*******************************************************************************
 *
 * GAS - Generic Address Structure (ACPI 2.0+)
 *
 * Note: Since this structure is used in the ACPI tables, it is byte aligned.
 * If misaligned access is not supported by the hardware, accesses to the
 * 64-bit Address field must be performed with care.
 *
 ******************************************************************************/

struct acpi_generic_address {
	u8 space_id;		/* Address space where struct or register exists */
	u8 bit_width;		/* Size in bits of given register */
	u8 bit_offset;		/* Bit offset within the register */
	u8 access_width;	/* Minimum Access size (ACPI 3.0) */
	u64 address;		/* 64-bit address of struct or register */
};

/*******************************************************************************
 *
 * RSDP - Root System Description Pointer (Signature is "RSD PTR ")
 *        Version 2
 *
 ******************************************************************************/

struct acpi_table_rsdp {
	char signature[8];	/* ACPI signature, contains "RSD PTR " */
	u8 checksum;		/* ACPI 1.0 checksum */
	char oem_id[ACPI_OEM_ID_SIZE];	/* OEM identification */
	u8 revision;		/* Must be (0) for ACPI 1.0 or (2) for ACPI 2.0+ */
	u32 rsdt_physical_address;	/* 32-bit physical address of the RSDT */
	u32 length;		/* Table length in bytes, including header (ACPI 2.0+) */
	u64 xsdt_physical_address;	/* 64-bit physical address of the XSDT (ACPI 2.0+) */
	u8 extended_checksum;	/* Checksum of entire table (ACPI 2.0+) */
	u8 reserved[3];		/* Reserved, must be zero */
};

/* Standalone struct for the ACPI 1.0 RSDP */

struct acpi_rsdp_common {
	char signature[8];
	u8 checksum;
	char oem_id[ACPI_OEM_ID_SIZE];
	u8 revision;
	u32 rsdt_physical_address;
};

/* Standalone struct for the extended part of the RSDP (ACPI 2.0+) */

struct acpi_rsdp_extension {
	u32 length;
	u64 xsdt_physical_address;
	u8 extended_checksum;
	u8 reserved[3];
};

/*******************************************************************************
 *
 * RSDT/XSDT - Root System Description Tables
 *             Version 1 (both)
 *
 ******************************************************************************/

struct acpi_table_rsdt {
	struct acpi_table_header header;	/* Common ACPI table header */
	u32 table_offset_entry[1];	/* Array of pointers to ACPI tables */
};

struct acpi_table_xsdt {
	struct acpi_table_header header;	/* Common ACPI table header */
	u64 table_offset_entry[1];	/* Array of pointers to ACPI tables */
};

#define ACPI_RSDT_ENTRY_SIZE        (sizeof (u32))
#define ACPI_XSDT_ENTRY_SIZE        (sizeof (u64))

/*******************************************************************************
 *
 * FACS - Firmware ACPI Control Structure (FACS)
 *
 ******************************************************************************/

struct acpi_table_facs {
	char signature[4];	/* ASCII table signature */
	u32 length;		/* Length of structure, in bytes */
	u32 hardware_signature;	/* Hardware configuration signature */
	u32 firmware_waking_vector;	/* 32-bit physical address of the Firmware Waking Vector */
	u32 global_lock;	/* Global Lock for shared hardware resources */
	u32 flags;
	u64 xfirmware_waking_vector;	/* 64-bit version of the Firmware Waking Vector (ACPI 2.0+) */
	u8 version;		/* Version of this table (ACPI 2.0+) */
	u8 reserved[3];		/* Reserved, must be zero */
	u32 ospm_flags;		/* Flags to be set by OSPM (ACPI 4.0) */
	u8 reserved1[24];	/* Reserved, must be zero */
};

/* Masks for global_lock flag field above */

#define ACPI_GLOCK_PENDING          (1)	/* 00: Pending global lock ownership */
#define ACPI_GLOCK_OWNED            (1<<1)	/* 01: Global lock is owned */

/* Masks for Flags field above  */

#define ACPI_FACS_S4_BIOS_PRESENT   (1)	/* 00: S4BIOS support is present */
#define ACPI_FACS_64BIT_WAKE        (1<<1)	/* 01: 64-bit wake vector supported (ACPI 4.0) */

/* Masks for ospm_flags field above */

#define ACPI_FACS_64BIT_ENVIRONMENT (1)	/* 00: 64-bit wake environment is required (ACPI 4.0) */

/*******************************************************************************
 *
 * FADT - Fixed ACPI Description Table (Signature "FACP")
 *        Version 6
 *
 ******************************************************************************/

/* Fields common to all versions of the FADT */

struct acpi_table_fadt {
	struct acpi_table_header header;	/* Common ACPI table header */
	u32 facs;		/* 32-bit physical address of FACS */
	u32 dsdt;		/* 32-bit physical address of DSDT */
	u8 model;		/* System Interrupt Model (ACPI 1.0) - not used in ACPI 2.0+ */
	u8 preferred_profile;	/* Conveys preferred power management profile to OSPM. */
	u16 sci_interrupt;	/* System vector of SCI interrupt */
	u32 smi_command;	/* 32-bit Port address of SMI command port */
	u8 acpi_enable;		/* Value to write to SMI_CMD to enable ACPI */
	u8 acpi_disable;	/* Value to write to SMI_CMD to disable ACPI */
	u8 s4_bios_request;	/* Value to write to SMI_CMD to enter S4BIOS state */
	u8 pstate_control;	/* Processor performance state control */
	u32 pm1a_event_block;	/* 32-bit port address of Power Mgt 1a Event Reg Blk */
	u32 pm1b_event_block;	/* 32-bit port address of Power Mgt 1b Event Reg Blk */
	u32 pm1a_control_block;	/* 32-bit port address of Power Mgt 1a Control Reg Blk */