Merge branch 'linus' into x86/cleanups

1 files changed, 312 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/utmath.c b/drivers/acpi/acpica/utmath.c
new file mode 100644
index 00000000000..c9f682d640e
--- /dev/null
+++ b/drivers/acpi/acpica/utmath.c
@@ -0,0 +1,312 @@
+/*******************************************************************************
+ *
+ * Module Name: utmath - Integer math support routines
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, 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.
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_UTILITIES
+ACPI_MODULE_NAME("utmath")
+
+/*
+ * Support for double-precision integer divide.  This code is included here
+ * in order to support kernel environments where the double-precision math
+ * library is not available.
+ */
+#ifndef ACPI_USE_NATIVE_DIVIDE
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_short_divide
+ *
+ * PARAMETERS:  Dividend            - 64-bit dividend
+ *              Divisor             - 32-bit divisor
+ *              out_quotient        - Pointer to where the quotient is returned
+ *              out_remainder       - Pointer to where the remainder is returned
+ *
+ * RETURN:      Status (Checks for divide-by-zero)
+ *
+ * DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits)
+ *              divide and modulo.  The result is a 64-bit quotient and a
+ *              32-bit remainder.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_ut_short_divide(acpi_integer dividend,
+		     u32 divisor,
+		     acpi_integer * out_quotient, u32 * out_remainder)
+{
+	union uint64_overlay dividend_ovl;
+	union uint64_overlay quotient;
+	u32 remainder32;
+
+	ACPI_FUNCTION_TRACE(ut_short_divide);
+
+	/* Always check for a zero divisor */
+
+	if (divisor == 0) {
+		ACPI_ERROR((AE_INFO, "Divide by zero"));
+		return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO);
+	}
+
+	dividend_ovl.full = dividend;
+
+	/*
+	 * The quotient is 64 bits, the remainder is always 32 bits,
+	 * and is generated by the second divide.
+	 */
+	ACPI_DIV_64_BY_32(0, dividend_ovl.part.hi, divisor,
+			  quotient.part.hi, remainder32);
+	ACPI_DIV_64_BY_32(remainder32, dividend_ovl.part.lo, divisor,
+			  quotient.part.lo, remainder32);
+
+	/* Return only what was requested */
+
+	if (out_quotient) {
+		*out_quotient = quotient.full;
+	}
+	if (out_remainder) {
+		*out_remainder = remainder32;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_divide
+ *
+ * PARAMETERS:  in_dividend         - Dividend
+ *              in_divisor          - Divisor
+ *              out_quotient        - Pointer to where the quotient is returned
+ *              out_remainder       - Pointer to where the remainder is returned
+ *
+ * RETURN:      Status (Checks for divide-by-zero)
+ *
+ * DESCRIPTION: Perform a divide and modulo.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_divide(acpi_integer in_dividend,
+	       acpi_integer in_divisor,
+	       acpi_integer * out_quotient, acpi_integer * out_remainder)
+{
+	union uint64_overlay dividend;
+	union uint64_overlay divisor;
+	union uint64_overlay quotient;
+	union uint64_overlay remainder;
+	union uint64_overlay normalized_dividend;
+	union uint64_overlay normalized_divisor;
+	u32 partial1;
+	union uint64_overlay partial2;
+	union uint64_overlay partial3;
+
+	ACPI_FUNCTION_TRACE(ut_divide);
+
+	/* Always check for a zero divisor */
+
+	if (in_divisor == 0) {
+		ACPI_ERROR((AE_INFO, "Divide by zero"));
+		return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO);
+	}
+
+	divisor.full = in_divisor;
+	dividend.full = in_dividend;
+	if (divisor.part.hi == 0) {
+		/*
+		 * 1) Simplest case is where the divisor is 32 bits, we can
+		 * just do two divides
+		 */
+		remainder.part.hi = 0;
+
+		/*
+		 * The quotient is 64 bits, the remainder is always 32 bits,
+		 * and is generated by the second divide.
+		 */
+		ACPI_DIV_64_BY_32(0, dividend.part.hi, divisor.part.lo,
+				  quotient.part.hi, partial1);
+		ACPI_DIV_64_BY_32(partial1, dividend.part.lo, divisor.part.lo,
+				  quotient.part.lo, remainder.part.lo);
+	}
+
+	else {
+		/*
+		 * 2) The general case where the divisor is a full 64 bits
+		 * is more difficult
+		 */
+		quotient.part.hi = 0;
+		normalized_dividend = dividend;
+		normalized_divisor = divisor;
+
+		/* Normalize the operands (shift until the divisor is < 32 bits) */
+
+		do {
+			ACPI_SHIFT_RIGHT_64(normalized_divisor.part.hi,
+					    normalized_divisor.part.lo);
+			ACPI_SHIFT_RIGHT_64(normalized_dividend.part.hi,
+					    normalized_dividend.part.lo);
+
+		} while (normalized_divisor.part.hi != 0);
+
+		/* Partial divide */
+
+		ACPI_DIV_64_BY_32(normalized_dividend.part.hi,
+				  normalized_dividend.part.lo,
+				  normalized_divisor.part.lo,
+				  quotient.part.lo, partial1);
+
+		/*
+		 * The quotient is always 32 bits, and simply requires adjustment.
+		 * The 64-bit remainder must be generated.
+		 */
+		partial1 = quotient.part.lo * divisor.part.hi;
+		partial2.full =
+		    (acpi_integer) quotient.part.lo * divisor.part.lo;
+		partial3.full = (acpi_integer) partial2.part.hi + partial1;
+
+		remainder.part.hi = partial3.part.lo;
+		remainder.part.lo = partial2.part.lo;
+
+		if (partial3.part.hi == 0) {
+			if (partial3.part.lo >= dividend.part.hi) {
+				if (partial3.part.lo == dividend.part.hi) {
+					if (partial2.part.lo > dividend.part.lo) {
+						quotient.part.lo--;
+						remainder.full -= divisor.full;
+					}
+				} else {
+					quotient.part.lo--;
+					remainder.full -= divisor.full;
+				}
+			}
+
+			remainder.full = remainder.full - dividend.full;
+			remainder.part.hi = (u32) - ((s32) remainder.part.hi);
+			remainder.part.lo = (u32) - ((s32) remainder.part.lo);
+
+			if (remainder.part.lo) {
+				remainder.part.hi--;
+			}
+		}
+	}
+
+	/* Return only what was requested */
+
+	if (out_quotient) {
+		*out_quotient = quotient.full;
+	}
+	if (out_remainder) {
+		*out_remainder = remainder.full;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+#else
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_short_divide, acpi_ut_divide
+ *
+ * PARAMETERS:  See function headers above
+ *
+ * DESCRIPTION: Native versions of the ut_divide functions. Use these if either
+ *              1) The target is a 64-bit platform and therefore 64-bit
+ *                 integer math is supported directly by the machine.
+ *              2) The target is a 32-bit or 16-bit platform, and the
+ *                 double-precision integer math library is available to
+ *                 perform the divide.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_ut_short_divide(acpi_integer in_dividend,
+		     u32 divisor,
+		     acpi_integer * out_quotient, u32 * out_remainder)
+{
+
+	ACPI_FUNCTION_TRACE(ut_short_divide);
+
+	/* Always check for a zero divisor */
+
+	if (divisor == 0) {
+		ACPI_ERROR((AE_INFO, "Divide by zero"));
+		return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO);
+	}
+
+	/* Return only what was requested */
+
+	if (out_quotient) {
+		*out_quotient = in_dividend / divisor;
+	}
+	if (out_remainder) {
+		*out_remainder = (u32) (in_dividend % divisor);
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+acpi_status
+acpi_ut_divide(acpi_integer in_dividend,
+	       acpi_integer in_divisor,
+	       acpi_integer * out_quotient, acpi_integer * out_remainder)
+{
+	ACPI_FUNCTION_TRACE(ut_divide);
+
+	/* Always check for a zero divisor */
+
+	if (in_divisor == 0) {
+		ACPI_ERROR((AE_INFO, "Divide by zero"));
+		return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO);
+	}
+
+	/* Return only what was requested */
+
+	if (out_quotient) {
+		*out_quotient = in_dividend / in_divisor;
+	}
+	if (out_remainder) {
+		*out_remainder = in_dividend % in_divisor;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+#endif