diff options
Diffstat (limited to 'drivers/acpi/utilities/utmath.c')
| -rw-r--r-- | drivers/acpi/utilities/utmath.c | 144 |
1 files changed, 60 insertions, 84 deletions
diff --git a/drivers/acpi/utilities/utmath.c b/drivers/acpi/utilities/utmath.c index 0d527c91543c..68a0a6f94129 100644 --- a/drivers/acpi/utilities/utmath.c +++ b/drivers/acpi/utilities/utmath.c @@ -41,19 +41,16 @@ * 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 /******************************************************************************* * @@ -71,27 +68,22 @@ * 32-bit remainder. * ******************************************************************************/ - acpi_status -acpi_ut_short_divide ( - acpi_integer 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_ovl; - union uint64_overlay quotient; - u32 remainder32; - - - ACPI_FUNCTION_TRACE ("ut_short_divide"); + 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_REPORT_ERROR (("acpi_ut_short_divide: Divide by zero\n")); - return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); + ACPI_REPORT_ERROR(("acpi_ut_short_divide: Divide by zero\n")); + return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO); } dividend_ovl.full = dividend; @@ -100,9 +92,9 @@ acpi_ut_short_divide ( * 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, + 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, + ACPI_DIV_64_BY_32(remainder32, dividend_ovl.part.lo, divisor, quotient.part.lo, remainder32); /* Return only what was requested */ @@ -114,10 +106,9 @@ acpi_ut_short_divide ( *out_remainder = remainder32; } - return_ACPI_STATUS (AE_OK); + return_ACPI_STATUS(AE_OK); } - /******************************************************************************* * * FUNCTION: acpi_ut_divide @@ -134,34 +125,30 @@ acpi_ut_short_divide ( ******************************************************************************/ 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); + ACPI_REPORT_ERROR(("acpi_ut_divide: Divide by zero\n")); + return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO); } - divisor.full = in_divisor; + divisor.full = in_divisor; dividend.full = in_dividend; if (divisor.part.hi == 0) { /* @@ -174,9 +161,9 @@ acpi_ut_divide ( * 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); } @@ -185,23 +172,23 @@ acpi_ut_divide ( * 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); @@ -210,8 +197,9 @@ acpi_ut_divide ( * 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; @@ -224,16 +212,15 @@ acpi_ut_divide ( 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--; @@ -250,11 +237,10 @@ acpi_ut_divide ( *out_remainder = remainder.full; } - return_ACPI_STATUS (AE_OK); + return_ACPI_STATUS(AE_OK); } #else - /******************************************************************************* * * FUNCTION: acpi_ut_short_divide, acpi_ut_divide @@ -269,23 +255,19 @@ acpi_ut_divide ( * 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_REPORT_ERROR(("acpi_ut_short_divide: Divide by zero\n")); + return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO); } /* Return only what was requested */ @@ -297,27 +279,23 @@ acpi_ut_short_divide ( *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); + ACPI_REPORT_ERROR(("acpi_ut_divide: Divide by zero\n")); + return_ACPI_STATUS(AE_AML_DIVIDE_BY_ZERO); } - /* Return only what was requested */ if (out_quotient) { @@ -327,9 +305,7 @@ acpi_ut_divide ( *out_remainder = in_dividend % in_divisor; } - return_ACPI_STATUS (AE_OK); + return_ACPI_STATUS(AE_OK); } #endif - - |