88ddd9e832
floating-point instruction in the kernel. The flags are supposed to be cumulative. Thanks to marcel for helping me test this.
125 lines
4.7 KiB
C
125 lines
4.7 KiB
C
/*-
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* Copyright (c) 1998 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_FPU_H_
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#define _MACHINE_FPU_H_
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/*
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* Floating point control register bits.
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*
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* From Alpha AXP Architecture Reference Manual, Instruction
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* Descriptions (I) PP 4-69.
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*/
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#define FPCR_INVD (1LL << 49) /* Invalid Operation DIsable */
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#define FPCR_DZED (1LL << 50) /* Division by Zero Disable */
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#define FPCR_OVFD (1LL << 51) /* Overflow Disable */
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#define FPCR_INV (1LL << 52) /* Invalid Operation */
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#define FPCR_DZE (1LL << 53) /* Division by Zero */
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#define FPCR_OVF (1LL << 54) /* Overflow */
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#define FPCR_UNF (1LL << 55) /* Underflow */
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#define FPCR_INE (1LL << 56) /* Inexact Result */
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#define FPCR_IOV (1LL << 57) /* Integer Overflow */
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#define FPCR_DYN_CHOPPED (0LL << 58) /* Chopped rounding mode */
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#define FPCR_DYN_MINUS (1LL << 58) /* Minus infinity */
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#define FPCR_DYN_NORMAL (2LL << 58) /* Normal rounding */
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#define FPCR_DYN_PLUS (3LL << 58) /* Plus infinity */
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#define FPCR_DYN_MASK (3LL << 58) /* Rounding mode mask */
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#define FPCR_DYN_SHIFT 58
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#define FPCR_UNDZ (1LL << 60) /* Underflow to Zero */
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#define FPCR_UNFD (1LL << 61) /* Underflow Disable */
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#define FPCR_INED (1LL << 62) /* Inexact Disable */
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#define FPCR_SUM (1LL << 63) /* Summary Bit */
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#define FPCR_MASK (~0LL << 49)
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#define FPCR_STATUS_MASK (FPCR_INV | FPCR_DZE | FPCR_OVF | \
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FPCR_UNF | FPCR_INE | FPCR_IOV)
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/*
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* Exception summary bits.
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*
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* From Alpha AXP Architecture Reference Manual, DEC OSF/1 Exceptions
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* and Interrupts (II-B) PP 5-5.
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*/
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#define EXCSUM_SWC (1LL << 0) /* Software completion */
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#define EXCSUM_INV (1LL << 1) /* Invalid operation */
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#define EXCSUM_DZE (1LL << 2) /* Division by zero */
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#define EXCSUM_OVF (1LL << 3) /* Overflow */
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#define EXCSUM_UNF (1LL << 4) /* Underflow */
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#define EXCSUM_INE (1LL << 5) /* Inexact result */
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#define EXCSUM_IOV (1LL << 6) /* Integer overflow */
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/*
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* Definitions for IEEE trap enables. These are implemented in
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* software and should be compatible with OSF/1 and Linux.
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*/
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/* read/write flags */
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#define IEEE_TRAP_ENABLE_INV (1LL << 1) /* Invalid operation */
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#define IEEE_TRAP_ENABLE_DZE (1LL << 2) /* Division by zero */
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#define IEEE_TRAP_ENABLE_OVF (1LL << 3) /* Overflow */
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#define IEEE_TRAP_ENABLE_UNF (1LL << 4) /* Underflow */
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#define IEEE_TRAP_ENABLE_INE (1LL << 5) /* Inexact result */
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#define IEEE_TRAP_ENABLE_MASK (IEEE_TRAP_ENABLE_INV \
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| IEEE_TRAP_ENABLE_DZE \
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| IEEE_TRAP_ENABLE_OVF \
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| IEEE_TRAP_ENABLE_UNF \
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| IEEE_TRAP_ENABLE_INE)
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/* read only flags */
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#define IEEE_STATUS_INV (1LL << 17) /* Invalid operation */
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#define IEEE_STATUS_DZE (1LL << 18) /* Division by zero */
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#define IEEE_STATUS_OVF (1LL << 19) /* Overflow */
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#define IEEE_STATUS_UNF (1LL << 20) /* Underflow */
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#define IEEE_STATUS_INE (1LL << 21) /* Inexact result */
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#define IEEE_STATUS_MASK (IEEE_STATUS_INV \
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| IEEE_STATUS_DZE \
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| IEEE_STATUS_OVF \
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| IEEE_STATUS_UNF \
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| IEEE_STATUS_INE)
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#define IEEE_STATUS_TO_EXCSUM_SHIFT 16 /* convert to excsum */
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#define IEEE_STATUS_TO_FPCR_SHIFT 35 /* convert to fpcr */
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#define IEEE_INHERIT (1LL << 63) /* inherit on fork */
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/* read and write floating point control register */
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#define GET_FPCR(x) \
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__asm__("trapb"); \
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__asm__("mf_fpcr %0" : "=f" (x)); \
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__asm__("trapb")
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#define SET_FPCR(x) \
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__asm__("trapb"); \
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__asm__("mt_fpcr %0" : : "f" (x)); \
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__asm__("trapb")
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#ifdef _KERNEL
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extern int fp_software_completion(u_int64_t regmask, struct thread *td);
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#endif
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#endif /* ! _MACHINE_FPU_H_ */
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