Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 494 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/utmath.c b/drivers/acpi/acpica/utmath.c
new file mode 100644
index 0000000000..2c2c6bc1ff
--- /dev/null
+++ b/drivers/acpi/acpica/utmath.c
@@ -0,0 +1,494 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/*******************************************************************************
+ *
+ * Module Name: utmath - Integer math support routines
+ *
+ ******************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_UTILITIES
+ACPI_MODULE_NAME("utmath")
+
+/* Structures used only for 64-bit divide */
+typedef struct uint64_struct {
+	u32 lo;
+	u32 hi;
+
+} uint64_struct;
+
+typedef union uint64_overlay {
+	u64 full;
+	struct uint64_struct part;
+
+} uint64_overlay;
+
+/*
+ * Optional support for 64-bit double-precision integer multiply and shift.
+ * This code is configurable and is implemented in order to support 32-bit
+ * kernel environments where a 64-bit double-precision math library is not
+ * available.
+ */
+#ifndef ACPI_USE_NATIVE_MATH64
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_short_multiply
+ *
+ * PARAMETERS:  multiplicand        - 64-bit multiplicand
+ *              multiplier          - 32-bit multiplier
+ *              out_product         - Pointer to where the product is returned
+ *
+ * DESCRIPTION: Perform a short multiply.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_short_multiply(u64 multiplicand, u32 multiplier, u64 *out_product)
+{
+	union uint64_overlay multiplicand_ovl;
+	union uint64_overlay product;
+	u32 carry32;
+
+	ACPI_FUNCTION_TRACE(ut_short_multiply);
+
+	multiplicand_ovl.full = multiplicand;
+
+	/*
+	 * The Product is 64 bits, the carry is always 32 bits,
+	 * and is generated by the second multiply.
+	 */
+	ACPI_MUL_64_BY_32(0, multiplicand_ovl.part.hi, multiplier,
+			  product.part.hi, carry32);
+
+	ACPI_MUL_64_BY_32(0, multiplicand_ovl.part.lo, multiplier,
+			  product.part.lo, carry32);
+
+	product.part.hi += carry32;
+
+	/* Return only what was requested */
+
+	if (out_product) {
+		*out_product = product.full;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_short_shift_left
+ *
+ * PARAMETERS:  operand             - 64-bit shift operand
+ *              count               - 32-bit shift count
+ *              out_result          - Pointer to where the result is returned
+ *
+ * DESCRIPTION: Perform a short left shift.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_short_shift_left(u64 operand, u32 count, u64 *out_result)
+{
+	union uint64_overlay operand_ovl;
+
+	ACPI_FUNCTION_TRACE(ut_short_shift_left);
+
+	operand_ovl.full = operand;
+
+	if ((count & 63) >= 32) {
+		operand_ovl.part.hi = operand_ovl.part.lo;
+		operand_ovl.part.lo = 0;
+		count = (count & 63) - 32;
+	}
+	ACPI_SHIFT_LEFT_64_BY_32(operand_ovl.part.hi,
+				 operand_ovl.part.lo, count);
+
+	/* Return only what was requested */
+
+	if (out_result) {
+		*out_result = operand_ovl.full;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_short_shift_right
+ *
+ * PARAMETERS:  operand             - 64-bit shift operand
+ *              count               - 32-bit shift count
+ *              out_result          - Pointer to where the result is returned
+ *
+ * DESCRIPTION: Perform a short right shift.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_short_shift_right(u64 operand, u32 count, u64 *out_result)
+{
+	union uint64_overlay operand_ovl;
+
+	ACPI_FUNCTION_TRACE(ut_short_shift_right);
+
+	operand_ovl.full = operand;
+
+	if ((count & 63) >= 32) {
+		operand_ovl.part.lo = operand_ovl.part.hi;
+		operand_ovl.part.hi = 0;
+		count = (count & 63) - 32;
+	}
+	ACPI_SHIFT_RIGHT_64_BY_32(operand_ovl.part.hi,
+				  operand_ovl.part.lo, count);
+
+	/* Return only what was requested */
+
+	if (out_result) {
+		*out_result = operand_ovl.full;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+#else
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_short_multiply
+ *
+ * PARAMETERS:  See function headers above
+ *
+ * DESCRIPTION: Native version of the ut_short_multiply function.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_short_multiply(u64 multiplicand, u32 multiplier, u64 *out_product)
+{
+
+	ACPI_FUNCTION_TRACE(ut_short_multiply);
+
+	/* Return only what was requested */
+
+	if (out_product) {
+		*out_product = multiplicand * multiplier;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_short_shift_left
+ *
+ * PARAMETERS:  See function headers above
+ *
+ * DESCRIPTION: Native version of the ut_short_shift_left function.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_short_shift_left(u64 operand, u32 count, u64 *out_result)
+{
+
+	ACPI_FUNCTION_TRACE(ut_short_shift_left);
+
+	/* Return only what was requested */
+
+	if (out_result) {
+		*out_result = operand << count;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_short_shift_right
+ *
+ * PARAMETERS:  See function headers above
+ *
+ * DESCRIPTION: Native version of the ut_short_shift_right function.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_short_shift_right(u64 operand, u32 count, u64 *out_result)
+{
+
+	ACPI_FUNCTION_TRACE(ut_short_shift_right);
+
+	/* Return only what was requested */
+
+	if (out_result) {
+		*out_result = operand >> count;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+#endif
+
+/*
+ * Optional support for 64-bit double-precision integer divide. This code
+ * is configurable and is implemented in order to support 32-bit kernel
+ * environments where a 64-bit double-precision math library is not available.
+ *
+ * Support for a more normal 64-bit divide/modulo (with check for a divide-
+ * by-zero) appears after this optional section of code.
+ */
+#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(u64 dividend,
+		     u32 divisor, u64 *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(u64 in_dividend,
+	       u64 in_divisor, u64 *out_quotient, u64 *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 = (u64) quotient.part.lo * divisor.part.lo;
+		partial3.full = (u64) 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(u64 in_dividend,
+		     u32 divisor, u64 *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(u64 in_dividend,
+	       u64 in_divisor, u64 *out_quotient, u64 *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