******************************************************************************/
/*
- * Copyright (C) 2000 - 2004, R. Byron Moore
+ * Copyright (C) 2000 - 2006, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* POSSIBILITY OF SUCH DAMAGES.
*/
-
#include <acpi/acpi.h>
-
#define _COMPONENT ACPI_UTILITIES
- ACPI_MODULE_NAME ("utmath")
+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: in_dividend - Pointer to the dividend
+ * 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
* 32-bit remainder.
*
******************************************************************************/
-
acpi_status
-acpi_ut_short_divide (
- acpi_integer *in_dividend,
- u32 divisor,
- acpi_integer *out_quotient,
- u32 *out_remainder)
+acpi_ut_short_divide(acpi_integer dividend,
+ u32 divisor,
+ acpi_integer * out_quotient, u32 * out_remainder)
{
- union uint64_overlay dividend;
- union uint64_overlay quotient;
- u32 remainder32;
-
+ union uint64_overlay dividend_ovl;
+ union uint64_overlay quotient;
+ u32 remainder32;
- ACPI_FUNCTION_TRACE ("ut_short_divide");
-
- dividend.full = *in_dividend;
+ ACPI_FUNCTION_TRACE(ut_short_divide);
/* Always check for a zero divisor */
if (divisor == 0) {
- ACPI_REPORT_ERROR (("acpi_ut_short_divide: Divide by zero\n"));
- return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
+ 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.part.hi, divisor,
+ ACPI_DIV_64_BY_32(0, dividend_ovl.part.hi, divisor,
quotient.part.hi, remainder32);
- ACPI_DIV_64_BY_32 (remainder32, dividend.part.lo, divisor,
+ ACPI_DIV_64_BY_32(remainder32, dividend_ovl.part.lo, divisor,
quotient.part.lo, remainder32);
/* Return only what was requested */
*out_remainder = remainder32;
}
- return_ACPI_STATUS (AE_OK);
+ return_ACPI_STATUS(AE_OK);
}
-
/*******************************************************************************
*
* FUNCTION: acpi_ut_divide
*
- * PARAMETERS: in_dividend - Pointer to the dividend
- * in_divisor - Pointer to the divisor
+ * 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
*
******************************************************************************/
acpi_status
-acpi_ut_divide (
- acpi_integer *in_dividend,
- acpi_integer *in_divisor,
- acpi_integer *out_quotient,
- acpi_integer *out_remainder)
+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");
-
+ 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_REPORT_ERROR (("acpi_ut_divide: Divide by zero\n"));
- return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
+ 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;
+ 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
* 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,
+ 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,
+ ACPI_DIV_64_BY_32(partial1, dividend.part.lo, divisor.part.lo,
quotient.part.lo, remainder.part.lo);
}
* 2) The general case where the divisor is a full 64 bits
* is more difficult
*/
- quotient.part.hi = 0;
+ 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);
+ 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,
+ 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;
+ 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;
quotient.part.lo--;
remainder.full -= divisor.full;
}
- }
- else {
+ } 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);
+ 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--;
*out_remainder = remainder.full;
}
- return_ACPI_STATUS (AE_OK);
+ 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.
* perform the divide.
*
******************************************************************************/
-
acpi_status
-acpi_ut_short_divide (
- acpi_integer *in_dividend,
- u32 divisor,
- acpi_integer *out_quotient,
- u32 *out_remainder)
+acpi_ut_short_divide(acpi_integer in_dividend,
+ u32 divisor,
+ acpi_integer * out_quotient, u32 * out_remainder)
{
- ACPI_FUNCTION_TRACE ("ut_short_divide");
-
+ ACPI_FUNCTION_TRACE(ut_short_divide);
/* Always check for a zero divisor */
if (divisor == 0) {
- ACPI_REPORT_ERROR (("acpi_ut_short_divide: Divide by zero\n"));
- return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
+ 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;
+ *out_quotient = in_dividend / divisor;
}
if (out_remainder) {
- *out_remainder = (u32) *in_dividend % divisor;
+ *out_remainder = (u32) in_dividend % divisor;
}
- return_ACPI_STATUS (AE_OK);
+ 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_ut_divide(acpi_integer in_dividend,
+ acpi_integer in_divisor,
+ acpi_integer * out_quotient, acpi_integer * out_remainder)
{
- ACPI_FUNCTION_TRACE ("ut_divide");
-
+ ACPI_FUNCTION_TRACE(ut_divide);
/* Always check for a zero divisor */
- if (*in_divisor == 0) {
- ACPI_REPORT_ERROR (("acpi_ut_divide: Divide by zero\n"));
- return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
+ 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;
+ *out_quotient = in_dividend / in_divisor;
}
if (out_remainder) {
- *out_remainder = *in_dividend % *in_divisor;
+ *out_remainder = in_dividend % in_divisor;
}
- return_ACPI_STATUS (AE_OK);
+ return_ACPI_STATUS(AE_OK);
}
#endif
-
-
git://git.onelab.eu / linux-2.6.git / blobdiff