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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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65082bfcb4
ACPICA commit 01b8f5a2350b9cc329cd8402ac8faec36fc501f5 In order to build ACPICA EFI tools with EDK-II on Windows, 64-bit multiply/shift supports are also required to be implemented. Otherwise, MSVC complains: acpidump.lib(utstrtoul64.obj) : error LNK2001: unresolved external symbol __allmul acpidump.lib(uthex.obj) : error LNK2001: unresolved external symbol __aullshr Note: 1. This patch also splits _EDK2_EFI from _GNU_EFI as they might have different math64 supports. 2. Support of gcc math64 is not included in this patch. 3. Support of EDK2 arch independent math64 is done via linking to base_lib. This patch fixes this issue. Reported by Shao Ming, fixed by Lv Zheng. For Linux kernel, this patch is a functional no-op. Link: https://github.com/acpica/acpica/commit/01b8f5a2 Tested-by: "Shao, Ming" <smbest163@163.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
530 lines
14 KiB
C
530 lines
14 KiB
C
/*******************************************************************************
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*
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* Module Name: utmath - Integer math support routines
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2017, 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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#include <acpi/acpi.h>
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#include "accommon.h"
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME("utmath")
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/* Structures used only for 64-bit divide */
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typedef struct uint64_struct {
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u32 lo;
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u32 hi;
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} uint64_struct;
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typedef union uint64_overlay {
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u64 full;
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struct uint64_struct part;
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} uint64_overlay;
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/*
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* Optional support for 64-bit double-precision integer multiply and shift.
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* This code is configurable and is implemented in order to support 32-bit
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* kernel environments where a 64-bit double-precision math library is not
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* available.
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*/
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#ifndef ACPI_USE_NATIVE_MATH64
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_short_multiply
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*
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* PARAMETERS: multiplicand - 64-bit multiplicand
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* multiplier - 32-bit multiplier
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* out_product - Pointer to where the product is returned
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*
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* DESCRIPTION: Perform a short multiply.
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*
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******************************************************************************/
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acpi_status
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acpi_ut_short_multiply(u64 multiplicand, u32 multiplier, u64 *out_product)
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{
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union uint64_overlay multiplicand_ovl;
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union uint64_overlay product;
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u32 carry32;
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ACPI_FUNCTION_TRACE(ut_short_multiply);
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multiplicand_ovl.full = multiplicand;
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/*
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* The Product is 64 bits, the carry is always 32 bits,
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* and is generated by the second multiply.
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*/
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ACPI_MUL_64_BY_32(0, multiplicand_ovl.part.hi, multiplier,
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product.part.hi, carry32);
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ACPI_MUL_64_BY_32(0, multiplicand_ovl.part.lo, multiplier,
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product.part.lo, carry32);
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product.part.hi += carry32;
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/* Return only what was requested */
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if (out_product) {
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*out_product = product.full;
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_short_shift_left
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*
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* PARAMETERS: operand - 64-bit shift operand
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* count - 32-bit shift count
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* out_result - Pointer to where the result is returned
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*
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* DESCRIPTION: Perform a short left shift.
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*
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******************************************************************************/
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acpi_status acpi_ut_short_shift_left(u64 operand, u32 count, u64 *out_result)
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{
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union uint64_overlay operand_ovl;
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ACPI_FUNCTION_TRACE(ut_short_shift_left);
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operand_ovl.full = operand;
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if ((count & 63) >= 32) {
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operand_ovl.part.hi = operand_ovl.part.lo;
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operand_ovl.part.lo ^= operand_ovl.part.lo;
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count = (count & 63) - 32;
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}
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ACPI_SHIFT_LEFT_64_BY_32(operand_ovl.part.hi,
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operand_ovl.part.lo, count);
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/* Return only what was requested */
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if (out_result) {
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*out_result = operand_ovl.full;
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_short_shift_right
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*
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* PARAMETERS: operand - 64-bit shift operand
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* count - 32-bit shift count
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* out_result - Pointer to where the result is returned
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*
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* DESCRIPTION: Perform a short right shift.
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*
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******************************************************************************/
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acpi_status acpi_ut_short_shift_right(u64 operand, u32 count, u64 *out_result)
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{
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union uint64_overlay operand_ovl;
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ACPI_FUNCTION_TRACE(ut_short_shift_right);
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operand_ovl.full = operand;
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if ((count & 63) >= 32) {
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operand_ovl.part.lo = operand_ovl.part.hi;
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operand_ovl.part.hi ^= operand_ovl.part.hi;
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count = (count & 63) - 32;
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}
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ACPI_SHIFT_RIGHT_64_BY_32(operand_ovl.part.hi,
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operand_ovl.part.lo, count);
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/* Return only what was requested */
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if (out_result) {
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*out_result = operand_ovl.full;
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}
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return_ACPI_STATUS(AE_OK);
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}
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#else
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_short_multiply
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*
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* PARAMETERS: See function headers above
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*
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* DESCRIPTION: Native version of the ut_short_multiply function.
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*
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******************************************************************************/
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acpi_status
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acpi_ut_short_multiply(u64 multiplicand, u32 multiplier, u64 *out_product)
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{
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ACPI_FUNCTION_TRACE(ut_short_multiply);
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/* Return only what was requested */
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if (out_product) {
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*out_product = multiplicand * multiplier;
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_short_shift_left
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*
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* PARAMETERS: See function headers above
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*
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* DESCRIPTION: Native version of the ut_short_shift_left function.
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*
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******************************************************************************/
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acpi_status acpi_ut_short_shift_left(u64 operand, u32 count, u64 *out_result)
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{
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ACPI_FUNCTION_TRACE(ut_short_shift_left);
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/* Return only what was requested */
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if (out_result) {
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*out_result = operand << count;
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_short_shift_right
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*
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* PARAMETERS: See function headers above
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*
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* DESCRIPTION: Native version of the ut_short_shift_right function.
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*
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******************************************************************************/
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acpi_status acpi_ut_short_shift_right(u64 operand, u32 count, u64 *out_result)
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{
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ACPI_FUNCTION_TRACE(ut_short_shift_right);
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/* Return only what was requested */
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if (out_result) {
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*out_result = operand >> count;
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}
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return_ACPI_STATUS(AE_OK);
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}
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#endif
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/*
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* Optional support for 64-bit double-precision integer divide. This code
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* is configurable and is implemented in order to support 32-bit kernel
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* environments where a 64-bit double-precision math library is not available.
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*
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* Support for a more normal 64-bit divide/modulo (with check for a divide-
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* by-zero) appears after this optional section of code.
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*/
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#ifndef ACPI_USE_NATIVE_DIVIDE
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_short_divide
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*
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* PARAMETERS: dividend - 64-bit dividend
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* divisor - 32-bit divisor
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* out_quotient - Pointer to where the quotient is returned
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* out_remainder - Pointer to where the remainder is returned
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*
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* RETURN: Status (Checks for divide-by-zero)
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*
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* DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits)
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* divide and modulo. The result is a 64-bit quotient and a
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* 32-bit remainder.
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*
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******************************************************************************/
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acpi_status
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acpi_ut_short_divide(u64 dividend,
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u32 divisor, u64 *out_quotient, u32 *out_remainder)
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{
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union uint64_overlay dividend_ovl;
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union uint64_overlay quotient;
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u32 remainder32;
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ACPI_FUNCTION_TRACE(ut_short_divide);
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/* Always check for a zero divisor */
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if (divisor == 0) {
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ACPI_ERROR((AE_INFO, "Divide by zero"));
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return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO);
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}
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dividend_ovl.full = dividend;
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/*
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* The quotient is 64 bits, the remainder is always 32 bits,
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* and is generated by the second divide.
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*/
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ACPI_DIV_64_BY_32(0, dividend_ovl.part.hi, divisor,
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quotient.part.hi, remainder32);
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ACPI_DIV_64_BY_32(remainder32, dividend_ovl.part.lo, divisor,
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quotient.part.lo, remainder32);
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/* Return only what was requested */
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if (out_quotient) {
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*out_quotient = quotient.full;
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}
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if (out_remainder) {
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*out_remainder = remainder32;
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_divide
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*
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* PARAMETERS: in_dividend - Dividend
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* in_divisor - Divisor
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* out_quotient - Pointer to where the quotient is returned
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* out_remainder - Pointer to where the remainder is returned
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*
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* RETURN: Status (Checks for divide-by-zero)
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*
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* DESCRIPTION: Perform a divide and modulo.
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*
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******************************************************************************/
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acpi_status
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acpi_ut_divide(u64 in_dividend,
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u64 in_divisor, u64 *out_quotient, u64 *out_remainder)
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{
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union uint64_overlay dividend;
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union uint64_overlay divisor;
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union uint64_overlay quotient;
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union uint64_overlay remainder;
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union uint64_overlay normalized_dividend;
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union uint64_overlay normalized_divisor;
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u32 partial1;
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union uint64_overlay partial2;
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union uint64_overlay partial3;
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ACPI_FUNCTION_TRACE(ut_divide);
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/* Always check for a zero divisor */
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if (in_divisor == 0) {
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ACPI_ERROR((AE_INFO, "Divide by zero"));
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return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO);
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}
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divisor.full = in_divisor;
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dividend.full = in_dividend;
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if (divisor.part.hi == 0) {
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/*
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* 1) Simplest case is where the divisor is 32 bits, we can
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* just do two divides
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*/
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remainder.part.hi = 0;
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/*
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* The quotient is 64 bits, the remainder is always 32 bits,
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* and is generated by the second divide.
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*/
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ACPI_DIV_64_BY_32(0, dividend.part.hi, divisor.part.lo,
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quotient.part.hi, partial1);
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ACPI_DIV_64_BY_32(partial1, dividend.part.lo, divisor.part.lo,
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quotient.part.lo, remainder.part.lo);
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}
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else {
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/*
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* 2) The general case where the divisor is a full 64 bits
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* is more difficult
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*/
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quotient.part.hi = 0;
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normalized_dividend = dividend;
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normalized_divisor = divisor;
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/* Normalize the operands (shift until the divisor is < 32 bits) */
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do {
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ACPI_SHIFT_RIGHT_64(normalized_divisor.part.hi,
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normalized_divisor.part.lo);
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ACPI_SHIFT_RIGHT_64(normalized_dividend.part.hi,
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normalized_dividend.part.lo);
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} while (normalized_divisor.part.hi != 0);
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/* Partial divide */
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ACPI_DIV_64_BY_32(normalized_dividend.part.hi,
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normalized_dividend.part.lo,
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normalized_divisor.part.lo, quotient.part.lo,
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partial1);
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/*
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* The quotient is always 32 bits, and simply requires
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* adjustment. The 64-bit remainder must be generated.
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*/
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partial1 = quotient.part.lo * divisor.part.hi;
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partial2.full = (u64) quotient.part.lo * divisor.part.lo;
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partial3.full = (u64) partial2.part.hi + partial1;
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remainder.part.hi = partial3.part.lo;
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remainder.part.lo = partial2.part.lo;
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if (partial3.part.hi == 0) {
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if (partial3.part.lo >= dividend.part.hi) {
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if (partial3.part.lo == dividend.part.hi) {
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if (partial2.part.lo > dividend.part.lo) {
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quotient.part.lo--;
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remainder.full -= divisor.full;
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}
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} else {
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quotient.part.lo--;
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remainder.full -= divisor.full;
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}
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}
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remainder.full = remainder.full - dividend.full;
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remainder.part.hi = (u32)-((s32)remainder.part.hi);
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remainder.part.lo = (u32)-((s32)remainder.part.lo);
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if (remainder.part.lo) {
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remainder.part.hi--;
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}
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}
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}
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/* Return only what was requested */
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if (out_quotient) {
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*out_quotient = quotient.full;
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}
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if (out_remainder) {
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*out_remainder = remainder.full;
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}
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return_ACPI_STATUS(AE_OK);
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}
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#else
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_short_divide, acpi_ut_divide
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*
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* PARAMETERS: See function headers above
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*
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* DESCRIPTION: Native versions of the ut_divide functions. Use these if either
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* 1) The target is a 64-bit platform and therefore 64-bit
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* integer math is supported directly by the machine.
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* 2) The target is a 32-bit or 16-bit platform, and the
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* double-precision integer math library is available to
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* perform the divide.
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*
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******************************************************************************/
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acpi_status
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acpi_ut_short_divide(u64 in_dividend,
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u32 divisor, u64 *out_quotient, u32 *out_remainder)
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{
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ACPI_FUNCTION_TRACE(ut_short_divide);
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/* Always check for a zero divisor */
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if (divisor == 0) {
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ACPI_ERROR((AE_INFO, "Divide by zero"));
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return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO);
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}
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/* Return only what was requested */
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if (out_quotient) {
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*out_quotient = in_dividend / divisor;
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}
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if (out_remainder) {
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*out_remainder = (u32) (in_dividend % divisor);
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}
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return_ACPI_STATUS(AE_OK);
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}
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acpi_status
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acpi_ut_divide(u64 in_dividend,
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u64 in_divisor, u64 *out_quotient, u64 *out_remainder)
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{
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ACPI_FUNCTION_TRACE(ut_divide);
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/* Always check for a zero divisor */
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if (in_divisor == 0) {
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ACPI_ERROR((AE_INFO, "Divide by zero"));
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return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO);
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}
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/* Return only what was requested */
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if (out_quotient) {
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*out_quotient = in_dividend / in_divisor;
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}
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if (out_remainder) {
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*out_remainder = in_dividend % in_divisor;
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}
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return_ACPI_STATUS(AE_OK);
|
|
}
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#endif
|