ACPICA: Add support for complex _PLD buffers.
_PLD (Physical Location of Device) returns a bit-packed buffer that is difficult to parse. This change adds a new interface, AcpiDecodePldBuffer that parses the buffer into a more usable local struct. Also adds macros to both get and set individual fields within the packed _PLD buffer. Adds a new include file, acbuffer.h - which will be expanded to add structs for other ACPI names that return buffers. ACPICA BZ 954. Emit (in comments) the decoded contents of a static _PLD buffer in order to improve comprehension of this bit-packed buffer. Add multi-endian support to the _PLD decode routine. Deploy the multi-endian macros to extract data from the _PLD buffer. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore
Len Brown
parent
4e2f9c278a
commit
be030a5768
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@ -707,15 +707,18 @@ union acpi_parse_value {
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u8 disasm_opcode; /* Subtype used for disassembly */\
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char aml_op_name[16]) /* Op name (debug only) */
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#define ACPI_DASM_BUFFER 0x00
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#define ACPI_DASM_RESOURCE 0x01
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#define ACPI_DASM_STRING 0x02
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#define ACPI_DASM_UNICODE 0x03
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#define ACPI_DASM_EISAID 0x04
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#define ACPI_DASM_MATCHOP 0x05
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#define ACPI_DASM_LNOT_PREFIX 0x06
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#define ACPI_DASM_LNOT_SUFFIX 0x07
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#define ACPI_DASM_IGNORE 0x08
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/* Flags for disasm_flags field above */
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#define ACPI_DASM_BUFFER 0x00 /* Buffer is a simple data buffer */
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#define ACPI_DASM_RESOURCE 0x01 /* Buffer is a Resource Descriptor */
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#define ACPI_DASM_STRING 0x02 /* Buffer is a ASCII string */
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#define ACPI_DASM_UNICODE 0x03 /* Buffer is a Unicode string */
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#define ACPI_DASM_PLD_METHOD 0x04 /* Buffer is a _PLD method bit-packed buffer */
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#define ACPI_DASM_EISAID 0x05 /* Integer is an EISAID */
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#define ACPI_DASM_MATCHOP 0x06 /* Parent opcode is a Match() operator */
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#define ACPI_DASM_LNOT_PREFIX 0x07 /* Start of a Lnot_equal (etc.) pair of opcodes */
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#define ACPI_DASM_LNOT_SUFFIX 0x08 /* End of a Lnot_equal (etc.) pair of opcodes */
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#define ACPI_DASM_IGNORE 0x09 /* Not used at this time */
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/*
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* Generic operation (for example: If, While, Store)
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@ -1025,6 +1028,7 @@ struct acpi_port_info {
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****************************************************************************/
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struct acpi_db_method_info {
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acpi_handle method;
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acpi_handle main_thread_gate;
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acpi_handle thread_complete_gate;
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acpi_thread_id *threads;
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@ -277,10 +277,33 @@
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/* Bitfields within ACPI registers */
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#define ACPI_REGISTER_PREPARE_BITS(val, pos, mask) ((val << pos) & mask)
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#define ACPI_REGISTER_INSERT_VALUE(reg, pos, mask, val) reg = (reg & (~(mask))) | ACPI_REGISTER_PREPARE_BITS(val, pos, mask)
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#define ACPI_REGISTER_PREPARE_BITS(val, pos, mask) \
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((val << pos) & mask)
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#define ACPI_INSERT_BITS(target, mask, source) target = ((target & (~(mask))) | (source & mask))
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#define ACPI_REGISTER_INSERT_VALUE(reg, pos, mask, val) \
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reg = (reg & (~(mask))) | ACPI_REGISTER_PREPARE_BITS(val, pos, mask)
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#define ACPI_INSERT_BITS(target, mask, source) \
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target = ((target & (~(mask))) | (source & mask))
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/* Generic bitfield macros and masks */
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#define ACPI_GET_BITS(source_ptr, position, mask) \
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((*source_ptr >> position) & mask)
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#define ACPI_SET_BITS(target_ptr, position, mask, value) \
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(*target_ptr |= ((value & mask) << position))
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#define ACPI_1BIT_MASK 0x00000001
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#define ACPI_2BIT_MASK 0x00000003
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#define ACPI_3BIT_MASK 0x00000007
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#define ACPI_4BIT_MASK 0x0000000F
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#define ACPI_5BIT_MASK 0x0000001F
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#define ACPI_6BIT_MASK 0x0000003F
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#define ACPI_7BIT_MASK 0x0000007F
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#define ACPI_8BIT_MASK 0x000000FF
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#define ACPI_16BIT_MASK 0x0000FFFF
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#define ACPI_24BIT_MASK 0x00FFFFFF
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/*
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* An object of type struct acpi_namespace_node can appear in some contexts
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@ -418,3 +418,90 @@ acpi_check_address_range(acpi_adr_space_type space_id,
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ACPI_EXPORT_SYMBOL(acpi_check_address_range)
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#endif /* !ACPI_ASL_COMPILER */
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/*******************************************************************************
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*
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* FUNCTION: acpi_decode_pld_buffer
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*
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* PARAMETERS: in_buffer - Buffer returned by _PLD method
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* length - Length of the in_buffer
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* return_buffer - Where the decode buffer is returned
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*
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* RETURN: Status and the decoded _PLD buffer. User must deallocate
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* the buffer via ACPI_FREE.
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*
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* DESCRIPTION: Decode the bit-packed buffer returned by the _PLD method into
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* a local struct that is much more useful to an ACPI driver.
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*
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******************************************************************************/
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acpi_status
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acpi_decode_pld_buffer(u8 *in_buffer,
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acpi_size length, struct acpi_pld_info ** return_buffer)
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{
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struct acpi_pld_info *pld_info;
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u32 *buffer = ACPI_CAST_PTR(u32, in_buffer);
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u32 dword;
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/* Parameter validation */
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if (!in_buffer || !return_buffer || (length < 16)) {
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return (AE_BAD_PARAMETER);
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}
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pld_info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pld_info));
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if (!pld_info) {
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return (AE_NO_MEMORY);
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}
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/* First 32-bit DWord */
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ACPI_MOVE_32_TO_32(&dword, &buffer[0]);
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pld_info->revision = ACPI_PLD_GET_REVISION(&dword);
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pld_info->ignore_color = ACPI_PLD_GET_IGNORE_COLOR(&dword);
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pld_info->color = ACPI_PLD_GET_COLOR(&dword);
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/* Second 32-bit DWord */
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ACPI_MOVE_32_TO_32(&dword, &buffer[1]);
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pld_info->width = ACPI_PLD_GET_WIDTH(&dword);
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pld_info->height = ACPI_PLD_GET_HEIGHT(&dword);
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/* Third 32-bit DWord */
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ACPI_MOVE_32_TO_32(&dword, &buffer[2]);
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pld_info->user_visible = ACPI_PLD_GET_USER_VISIBLE(&dword);
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pld_info->dock = ACPI_PLD_GET_DOCK(&dword);
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pld_info->lid = ACPI_PLD_GET_LID(&dword);
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pld_info->panel = ACPI_PLD_GET_PANEL(&dword);
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pld_info->vertical_position = ACPI_PLD_GET_VERTICAL(&dword);
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pld_info->horizontal_position = ACPI_PLD_GET_HORIZONTAL(&dword);
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pld_info->shape = ACPI_PLD_GET_SHAPE(&dword);
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pld_info->group_orientation = ACPI_PLD_GET_ORIENTATION(&dword);
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pld_info->group_token = ACPI_PLD_GET_TOKEN(&dword);
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pld_info->group_position = ACPI_PLD_GET_POSITION(&dword);
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pld_info->bay = ACPI_PLD_GET_BAY(&dword);
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/* Fourth 32-bit DWord */
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ACPI_MOVE_32_TO_32(&dword, &buffer[3]);
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pld_info->ejectable = ACPI_PLD_GET_EJECTABLE(&dword);
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pld_info->ospm_eject_required = ACPI_PLD_GET_OSPM_EJECT(&dword);
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pld_info->cabinet_number = ACPI_PLD_GET_CABINET(&dword);
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pld_info->card_cage_number = ACPI_PLD_GET_CARD_CAGE(&dword);
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pld_info->reference = ACPI_PLD_GET_REFERENCE(&dword);
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pld_info->rotation = ACPI_PLD_GET_ROTATION(&dword);
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pld_info->order = ACPI_PLD_GET_ORDER(&dword);
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if (length >= ACPI_PLD_BUFFER_SIZE) {
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/* Fifth 32-bit DWord (Revision 2 of _PLD) */
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ACPI_MOVE_32_TO_32(&dword, &buffer[4]);
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pld_info->vertical_offset = ACPI_PLD_GET_VERT_OFFSET(&dword);
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pld_info->horizontal_offset = ACPI_PLD_GET_HORIZ_OFFSET(&dword);
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}
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*return_buffer = pld_info;
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return (AE_OK);
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}
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ACPI_EXPORT_SYMBOL(acpi_decode_pld_buffer)
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@ -0,0 +1,192 @@
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/******************************************************************************
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*
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* Name: acbuffer.h - Support for buffers returned by ACPI predefined names
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2012, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#ifndef __ACBUFFER_H__
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#define __ACBUFFER_H__
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/*
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* Note: C bitfields are not used for this reason:
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*
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* "Bitfields are great and easy to read, but unfortunately the C language
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* does not specify the layout of bitfields in memory, which means they are
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* essentially useless for dealing with packed data in on-disk formats or
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* binary wire protocols." (Or ACPI tables and buffers.) "If you ask me,
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* this decision was a design error in C. Ritchie could have picked an order
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* and stuck with it." Norman Ramsey.
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* See http://stackoverflow.com/a/1053662/41661
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*/
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/*
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* Formatted _PLD return value. The minimum size is a package containing
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* one buffer.
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* Revision 1: Buffer is 16 bytes (128 bits)
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* Revision 2: Buffer is 20 bytes (160 bits)
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*
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* Note: This structure is returned from the acpi_decode_pld_buffer
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* interface.
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*/
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struct acpi_pld_info {
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u8 revision;
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u8 ignore_color;
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u32 color;
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u16 width;
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u16 height;
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u8 user_visible;
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u8 dock;
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u8 lid;
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u8 panel;
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u8 vertical_position;
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u8 horizontal_position;
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u8 shape;
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u8 group_orientation;
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u8 group_token;
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u8 group_position;
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u8 bay;
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u8 ejectable;
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u8 ospm_eject_required;
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u8 cabinet_number;
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u8 card_cage_number;
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u8 reference;
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u8 rotation;
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u8 order;
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u8 reserved;
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u16 vertical_offset;
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u16 horizontal_offset;
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};
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/*
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* Macros to:
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* 1) Convert a _PLD buffer to internal struct acpi_pld_info format - ACPI_PLD_GET*
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* (Used by acpi_decode_pld_buffer)
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* 2) Construct a _PLD buffer - ACPI_PLD_SET*
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* (Intended for BIOS use only)
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*/
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#define ACPI_PLD_REV1_BUFFER_SIZE 16 /* For Revision 1 of the buffer (From ACPI spec) */
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#define ACPI_PLD_BUFFER_SIZE 20 /* For Revision 2 of the buffer (From ACPI spec) */
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/* First 32-bit dword, bits 0:32 */
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#define ACPI_PLD_GET_REVISION(dword) ACPI_GET_BITS (dword, 0, ACPI_7BIT_MASK)
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#define ACPI_PLD_SET_REVISION(dword,value) ACPI_SET_BITS (dword, 0, ACPI_7BIT_MASK, value) /* Offset 0, Len 7 */
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#define ACPI_PLD_GET_IGNORE_COLOR(dword) ACPI_GET_BITS (dword, 7, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_IGNORE_COLOR(dword,value) ACPI_SET_BITS (dword, 7, ACPI_1BIT_MASK, value) /* Offset 7, Len 1 */
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#define ACPI_PLD_GET_COLOR(dword) ACPI_GET_BITS (dword, 8, ACPI_24BIT_MASK)
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#define ACPI_PLD_SET_COLOR(dword,value) ACPI_SET_BITS (dword, 8, ACPI_24BIT_MASK, value) /* Offset 8, Len 24 */
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/* Second 32-bit dword, bits 33:63 */
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#define ACPI_PLD_GET_WIDTH(dword) ACPI_GET_BITS (dword, 0, ACPI_16BIT_MASK)
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#define ACPI_PLD_SET_WIDTH(dword,value) ACPI_SET_BITS (dword, 0, ACPI_16BIT_MASK, value) /* Offset 32+0=32, Len 16 */
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#define ACPI_PLD_GET_HEIGHT(dword) ACPI_GET_BITS (dword, 16, ACPI_16BIT_MASK)
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#define ACPI_PLD_SET_HEIGHT(dword,value) ACPI_SET_BITS (dword, 16, ACPI_16BIT_MASK, value) /* Offset 32+16=48, Len 16 */
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/* Third 32-bit dword, bits 64:95 */
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#define ACPI_PLD_GET_USER_VISIBLE(dword) ACPI_GET_BITS (dword, 0, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_USER_VISIBLE(dword,value) ACPI_SET_BITS (dword, 0, ACPI_1BIT_MASK, value) /* Offset 64+0=64, Len 1 */
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#define ACPI_PLD_GET_DOCK(dword) ACPI_GET_BITS (dword, 1, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_DOCK(dword,value) ACPI_SET_BITS (dword, 1, ACPI_1BIT_MASK, value) /* Offset 64+1=65, Len 1 */
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#define ACPI_PLD_GET_LID(dword) ACPI_GET_BITS (dword, 2, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_LID(dword,value) ACPI_SET_BITS (dword, 2, ACPI_1BIT_MASK, value) /* Offset 64+2=66, Len 1 */
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#define ACPI_PLD_GET_PANEL(dword) ACPI_GET_BITS (dword, 3, ACPI_3BIT_MASK)
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#define ACPI_PLD_SET_PANEL(dword,value) ACPI_SET_BITS (dword, 3, ACPI_3BIT_MASK, value) /* Offset 64+3=67, Len 3 */
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#define ACPI_PLD_GET_VERTICAL(dword) ACPI_GET_BITS (dword, 6, ACPI_2BIT_MASK)
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#define ACPI_PLD_SET_VERTICAL(dword,value) ACPI_SET_BITS (dword, 6, ACPI_2BIT_MASK, value) /* Offset 64+6=70, Len 2 */
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#define ACPI_PLD_GET_HORIZONTAL(dword) ACPI_GET_BITS (dword, 8, ACPI_2BIT_MASK)
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#define ACPI_PLD_SET_HORIZONTAL(dword,value) ACPI_SET_BITS (dword, 8, ACPI_2BIT_MASK, value) /* Offset 64+8=72, Len 2 */
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#define ACPI_PLD_GET_SHAPE(dword) ACPI_GET_BITS (dword, 10, ACPI_4BIT_MASK)
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#define ACPI_PLD_SET_SHAPE(dword,value) ACPI_SET_BITS (dword, 10, ACPI_4BIT_MASK, value) /* Offset 64+10=74, Len 4 */
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#define ACPI_PLD_GET_ORIENTATION(dword) ACPI_GET_BITS (dword, 14, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_ORIENTATION(dword,value) ACPI_SET_BITS (dword, 14, ACPI_1BIT_MASK, value) /* Offset 64+14=78, Len 1 */
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#define ACPI_PLD_GET_TOKEN(dword) ACPI_GET_BITS (dword, 15, ACPI_8BIT_MASK)
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#define ACPI_PLD_SET_TOKEN(dword,value) ACPI_SET_BITS (dword, 15, ACPI_8BIT_MASK, value) /* Offset 64+15=79, Len 8 */
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#define ACPI_PLD_GET_POSITION(dword) ACPI_GET_BITS (dword, 23, ACPI_8BIT_MASK)
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#define ACPI_PLD_SET_POSITION(dword,value) ACPI_SET_BITS (dword, 23, ACPI_8BIT_MASK, value) /* Offset 64+23=87, Len 8 */
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#define ACPI_PLD_GET_BAY(dword) ACPI_GET_BITS (dword, 31, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_BAY(dword,value) ACPI_SET_BITS (dword, 31, ACPI_1BIT_MASK, value) /* Offset 64+31=95, Len 1 */
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/* Fourth 32-bit dword, bits 96:127 */
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#define ACPI_PLD_GET_EJECTABLE(dword) ACPI_GET_BITS (dword, 0, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_EJECTABLE(dword,value) ACPI_SET_BITS (dword, 0, ACPI_1BIT_MASK, value) /* Offset 96+0=96, Len 1 */
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#define ACPI_PLD_GET_OSPM_EJECT(dword) ACPI_GET_BITS (dword, 1, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_OSPM_EJECT(dword,value) ACPI_SET_BITS (dword, 1, ACPI_1BIT_MASK, value) /* Offset 96+1=97, Len 1 */
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#define ACPI_PLD_GET_CABINET(dword) ACPI_GET_BITS (dword, 2, ACPI_8BIT_MASK)
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#define ACPI_PLD_SET_CABINET(dword,value) ACPI_SET_BITS (dword, 2, ACPI_8BIT_MASK, value) /* Offset 96+2=98, Len 8 */
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#define ACPI_PLD_GET_CARD_CAGE(dword) ACPI_GET_BITS (dword, 10, ACPI_8BIT_MASK)
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#define ACPI_PLD_SET_CARD_CAGE(dword,value) ACPI_SET_BITS (dword, 10, ACPI_8BIT_MASK, value) /* Offset 96+10=106, Len 8 */
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#define ACPI_PLD_GET_REFERENCE(dword) ACPI_GET_BITS (dword, 18, ACPI_1BIT_MASK)
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#define ACPI_PLD_SET_REFERENCE(dword,value) ACPI_SET_BITS (dword, 18, ACPI_1BIT_MASK, value) /* Offset 96+18=114, Len 1 */
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#define ACPI_PLD_GET_ROTATION(dword) ACPI_GET_BITS (dword, 19, ACPI_4BIT_MASK)
|
||||
#define ACPI_PLD_SET_ROTATION(dword,value) ACPI_SET_BITS (dword, 19, ACPI_4BIT_MASK, value) /* Offset 96+19=115, Len 4 */
|
||||
|
||||
#define ACPI_PLD_GET_ORDER(dword) ACPI_GET_BITS (dword, 23, ACPI_5BIT_MASK)
|
||||
#define ACPI_PLD_SET_ORDER(dword,value) ACPI_SET_BITS (dword, 23, ACPI_5BIT_MASK, value) /* Offset 96+23=119, Len 5 */
|
||||
|
||||
/* Fifth 32-bit dword, bits 128:159 (Revision 2 of _PLD only) */
|
||||
|
||||
#define ACPI_PLD_GET_VERT_OFFSET(dword) ACPI_GET_BITS (dword, 0, ACPI_16BIT_MASK)
|
||||
#define ACPI_PLD_SET_VERT_OFFSET(dword,value) ACPI_SET_BITS (dword, 0, ACPI_16BIT_MASK, value) /* Offset 128+0=128, Len 16 */
|
||||
|
||||
#define ACPI_PLD_GET_HORIZ_OFFSET(dword) ACPI_GET_BITS (dword, 16, ACPI_16BIT_MASK)
|
||||
#define ACPI_PLD_SET_HORIZ_OFFSET(dword,value) ACPI_SET_BITS (dword, 16, ACPI_16BIT_MASK, value) /* Offset 128+16=144, Len 16 */
|
||||
|
||||
#endif /* ACBUFFER_H */
|
||||
|
|
@ -63,6 +63,7 @@
|
|||
#define METHOD_NAME__PRW "_PRW"
|
||||
#define METHOD_NAME__SRS "_SRS"
|
||||
#define METHOD_NAME__CBA "_CBA"
|
||||
#define METHOD_NAME__PLD "_PLD"
|
||||
|
||||
/* Method names - these methods must appear at the namespace root */
|
||||
|
||||
|
|
|
|||
|
|
@ -52,6 +52,7 @@
|
|||
#include "acconfig.h"
|
||||
#include "actypes.h"
|
||||
#include "actbl.h"
|
||||
#include "acbuffer.h"
|
||||
|
||||
extern u8 acpi_gbl_permanent_mmap;
|
||||
|
||||
|
|
@ -144,6 +145,10 @@ acpi_check_address_range(acpi_adr_space_type space_id,
|
|||
acpi_physical_address address,
|
||||
acpi_size length, u8 warn);
|
||||
|
||||
acpi_status
|
||||
acpi_decode_pld_buffer(u8 *in_buffer,
|
||||
acpi_size length, struct acpi_pld_info **return_buffer);
|
||||
|
||||
/*
|
||||
* ACPI Memory management
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -79,9 +79,15 @@
|
|||
#pragma pack(1)
|
||||
|
||||
/*
|
||||
* Note about bitfields: The u8 type is used for bitfields in ACPI tables.
|
||||
* This is the only type that is even remotely portable. Anything else is not
|
||||
* portable, so do not use any other bitfield types.
|
||||
* 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
|
||||
*/
|
||||
|
||||
/*******************************************************************************
|
||||
|
|
|
|||
|
|
@ -79,9 +79,15 @@
|
|||
#pragma pack(1)
|
||||
|
||||
/*
|
||||
* Note about bitfields: The u8 type is used for bitfields in ACPI tables.
|
||||
* This is the only type that is even remotely portable. Anything else is not
|
||||
* portable, so do not use any other bitfield types.
|
||||
* 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
|
||||
*/
|
||||
|
||||
/*******************************************************************************
|
||||
|
|
|
|||
|
|
@ -98,9 +98,15 @@
|
|||
#pragma pack(1)
|
||||
|
||||
/*
|
||||
* Note about bitfields: The u8 type is used for bitfields in ACPI tables.
|
||||
* This is the only type that is even remotely portable. Anything else is not
|
||||
* portable, so do not use any other bitfield types.
|
||||
* 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
|
||||
*/
|
||||
|
||||
/*******************************************************************************
|
||||
|
|
|
|||
|
|
@ -86,9 +86,15 @@
|
|||
#pragma pack(1)
|
||||
|
||||
/*
|
||||
* Note about bitfields: The u8 type is used for bitfields in ACPI tables.
|
||||
* This is the only type that is even remotely portable. Anything else is not
|
||||
* portable, so do not use any other bitfield types.
|
||||
* 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
|
||||
*/
|
||||
|
||||
/*******************************************************************************
|
||||
|
|
|
|||
Loading…
Reference in New Issue