#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME ("utmath")
-/*
- * 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
-
/* Structures used only for 64-bit divide */
typedef struct uint64_struct
} 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: AcpiUtShortMultiply
+ *
+ * PARAMETERS: Multiplicand - 64-bit multiplicand
+ * Multiplier - 32-bit multiplier
+ * OutProduct - Pointer to where the product is returned
+ *
+ * DESCRIPTION: Perform a short multiply.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiUtShortMultiply (
+ UINT64 Multiplicand,
+ UINT32 Multiplier,
+ UINT64 *OutProduct)
+{
+ UINT64_OVERLAY MultiplicandOvl;
+ UINT64_OVERLAY Product;
+ UINT32 Carry32;
+
+
+ ACPI_FUNCTION_TRACE (UtShortMultiply);
+
+
+ MultiplicandOvl.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, MultiplicandOvl.Part.Hi, Multiplier,
+ Product.Part.Hi, Carry32);
+
+ ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Lo, Multiplier,
+ Product.Part.Lo, Carry32);
+
+ Product.Part.Hi += Carry32;
+
+ /* Return only what was requested */
+
+ if (OutProduct)
+ {
+ *OutProduct = Product.Full;
+ }
+
+ return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiUtShortShiftLeft
+ *
+ * PARAMETERS: Operand - 64-bit shift operand
+ * Count - 32-bit shift count
+ * OutResult - Pointer to where the result is returned
+ *
+ * DESCRIPTION: Perform a short left shift.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiUtShortShiftLeft (
+ UINT64 Operand,
+ UINT32 Count,
+ UINT64 *OutResult)
+{
+ UINT64_OVERLAY OperandOvl;
+
+
+ ACPI_FUNCTION_TRACE (UtShortShiftLeft);
+
+
+ OperandOvl.Full = Operand;
+
+ if ((Count & 63) >= 32)
+ {
+ OperandOvl.Part.Hi = OperandOvl.Part.Lo;
+ OperandOvl.Part.Lo ^= OperandOvl.Part.Lo;
+ Count = (Count & 63) - 32;
+ }
+ ACPI_SHIFT_LEFT_64_BY_32 (OperandOvl.Part.Hi,
+ OperandOvl.Part.Lo, Count);
+
+ /* Return only what was requested */
+
+ if (OutResult)
+ {
+ *OutResult = OperandOvl.Full;
+ }
+
+ return_ACPI_STATUS (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiUtShortShiftRight
+ *
+ * PARAMETERS: Operand - 64-bit shift operand
+ * Count - 32-bit shift count
+ * OutResult - Pointer to where the result is returned
+ *
+ * DESCRIPTION: Perform a short right shift.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiUtShortShiftRight (
+ UINT64 Operand,
+ UINT32 Count,
+ UINT64 *OutResult)
+{
+ UINT64_OVERLAY OperandOvl;
+
+
+ ACPI_FUNCTION_TRACE (UtShortShiftRight);
+
+
+ OperandOvl.Full = Operand;
+
+ if ((Count & 63) >= 32)
+ {
+ OperandOvl.Part.Lo = OperandOvl.Part.Hi;
+ OperandOvl.Part.Hi ^= OperandOvl.Part.Hi;
+ Count = (Count & 63) - 32;
+ }
+ ACPI_SHIFT_RIGHT_64_BY_32 (OperandOvl.Part.Hi,
+ OperandOvl.Part.Lo, Count);
+
+ /* Return only what was requested */
+
+ if (OutResult)
+ {
+ *OutResult = OperandOvl.Full;
+ }
+
+ return_ACPI_STATUS (AE_OK);
+}
+#else
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiUtShortMultiply
+ *
+ * PARAMETERS: See function headers above
+ *
+ * DESCRIPTION: Native version of the UtShortMultiply function.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiUtShortMultiply (
+ UINT64 Multiplicand,
+ UINT32 Multiplier,
+ UINT64 *OutProduct)
+{
+
+ ACPI_FUNCTION_TRACE (UtShortMultiply);
+
+
+ /* Return only what was requested */
+
+ if (OutProduct)
+ {
+ *OutProduct = Multiplicand * Multiplier;
+ }
+
+ return_ACPI_STATUS (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiUtShortShiftLeft
+ *
+ * PARAMETERS: See function headers above
+ *
+ * DESCRIPTION: Native version of the UtShortShiftLeft function.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiUtShortShiftLeft (
+ UINT64 Operand,
+ UINT32 Count,
+ UINT64 *OutResult)
+{
+
+ ACPI_FUNCTION_TRACE (UtShortShiftLeft);
+
+
+ /* Return only what was requested */
+
+ if (OutResult)
+ {
+ *OutResult = Operand << Count;
+ }
+
+ return_ACPI_STATUS (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiUtShortShiftRight
+ *
+ * PARAMETERS: See function headers above
+ *
+ * DESCRIPTION: Native version of the UtShortShiftRight function.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiUtShortShiftRight (
+ UINT64 Operand,
+ UINT32 Count,
+ UINT64 *OutResult)
+{
+
+ ACPI_FUNCTION_TRACE (UtShortShiftRight);
+
+
+ /* Return only what was requested */
+
+ if (OutResult)
+ {
+ *OutResult = 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
+
/*******************************************************************************
*
projects / reactos.git / blobdiff