c73ba67e32
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
/*-
|
|
* Copyright (c) 1998 Doug Rabson
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_FPU_H_
|
|
#define _MACHINE_FPU_H_
|
|
|
|
/*
|
|
* Floating point control register bits.
|
|
*
|
|
* From Alpha AXP Architecture Reference Manual, Instruction
|
|
* Descriptions (I) PP 4-69.
|
|
*/
|
|
|
|
#define FPCR_INVD (1LL << 49) /* Invalid Operation DIsable */
|
|
#define FPCR_DZED (1LL << 50) /* Division by Zero Disable */
|
|
#define FPCR_OVFD (1LL << 51) /* Overflow Disable */
|
|
#define FPCR_INV (1LL << 52) /* Invalid Operation */
|
|
#define FPCR_DZE (1LL << 53) /* Division by Zero */
|
|
#define FPCR_OVF (1LL << 54) /* Overflow */
|
|
#define FPCR_UNF (1LL << 55) /* Underflow */
|
|
#define FPCR_INE (1LL << 56) /* Inexact Result */
|
|
#define FPCR_IOV (1LL << 57) /* Integer Overflow */
|
|
#define FPCR_DYN_CHOPPED (0LL << 58) /* Chopped rounding mode */
|
|
#define FPCR_DYN_MINUS (1LL << 58) /* Minus infinity */
|
|
#define FPCR_DYN_NORMAL (2LL << 58) /* Normal rounding */
|
|
#define FPCR_DYN_PLUS (3LL << 58) /* Plus infinity */
|
|
#define FPCR_DYN_MASK (3LL << 58) /* Rounding mode mask */
|
|
#define FPCR_DYN_SHIFT 58
|
|
#define FPCR_UNDZ (1LL << 60) /* Underflow to Zero */
|
|
#define FPCR_UNFD (1LL << 61) /* Underflow Disable */
|
|
#define FPCR_INED (1LL << 62) /* Inexact Disable */
|
|
#define FPCR_SUM (1LL << 63) /* Summary Bit */
|
|
#define FPCR_MASK (~0LL << 49)
|
|
#define FPCR_STATUS_MASK (FPCR_INV | FPCR_DZE | FPCR_OVF | \
|
|
FPCR_UNF | FPCR_INE | FPCR_IOV)
|
|
|
|
/*
|
|
* Exception summary bits.
|
|
*
|
|
* From Alpha AXP Architecture Reference Manual, DEC OSF/1 Exceptions
|
|
* and Interrupts (II-B) PP 5-5.
|
|
*/
|
|
|
|
#define EXCSUM_SWC (1LL << 0) /* Software completion */
|
|
#define EXCSUM_INV (1LL << 1) /* Invalid operation */
|
|
#define EXCSUM_DZE (1LL << 2) /* Division by zero */
|
|
#define EXCSUM_OVF (1LL << 3) /* Overflow */
|
|
#define EXCSUM_UNF (1LL << 4) /* Underflow */
|
|
#define EXCSUM_INE (1LL << 5) /* Inexact result */
|
|
#define EXCSUM_IOV (1LL << 6) /* Integer overflow */
|
|
|
|
/*
|
|
* Definitions for IEEE trap enables. These are implemented in
|
|
* software and should be compatible with OSF/1 and Linux.
|
|
*/
|
|
|
|
/* read/write flags */
|
|
#define IEEE_TRAP_ENABLE_INV (1LL << 1) /* Invalid operation */
|
|
#define IEEE_TRAP_ENABLE_DZE (1LL << 2) /* Division by zero */
|
|
#define IEEE_TRAP_ENABLE_OVF (1LL << 3) /* Overflow */
|
|
#define IEEE_TRAP_ENABLE_UNF (1LL << 4) /* Underflow */
|
|
#define IEEE_TRAP_ENABLE_INE (1LL << 5) /* Inexact result */
|
|
#define IEEE_TRAP_ENABLE_MASK (IEEE_TRAP_ENABLE_INV \
|
|
| IEEE_TRAP_ENABLE_DZE \
|
|
| IEEE_TRAP_ENABLE_OVF \
|
|
| IEEE_TRAP_ENABLE_UNF \
|
|
| IEEE_TRAP_ENABLE_INE)
|
|
|
|
/* read only flags */
|
|
#define IEEE_STATUS_INV (1LL << 17) /* Invalid operation */
|
|
#define IEEE_STATUS_DZE (1LL << 18) /* Division by zero */
|
|
#define IEEE_STATUS_OVF (1LL << 19) /* Overflow */
|
|
#define IEEE_STATUS_UNF (1LL << 20) /* Underflow */
|
|
#define IEEE_STATUS_INE (1LL << 21) /* Inexact result */
|
|
#define IEEE_STATUS_MASK (IEEE_STATUS_INV \
|
|
| IEEE_STATUS_DZE \
|
|
| IEEE_STATUS_OVF \
|
|
| IEEE_STATUS_UNF \
|
|
| IEEE_STATUS_INE)
|
|
#define IEEE_STATUS_TO_EXCSUM_SHIFT 16 /* convert to excsum */
|
|
#define IEEE_STATUS_TO_FPCR_SHIFT 35 /* convert to fpcr */
|
|
|
|
#define IEEE_INHERIT (1LL << 63) /* inherit on fork */
|
|
|
|
/* read and write floating point control register */
|
|
#define GET_FPCR(x) \
|
|
__asm__("trapb"); \
|
|
__asm__("mf_fpcr %0" : "=f" (x)); \
|
|
__asm__("trapb")
|
|
#define SET_FPCR(x) \
|
|
__asm__("trapb"); \
|
|
__asm__("mt_fpcr %0" : : "f" (x)); \
|
|
__asm__("trapb")
|
|
|
|
#ifdef _KERNEL
|
|
extern int fp_software_completion(u_int64_t regmask, struct thread *td);
|
|
#endif
|
|
|
|
#endif /* ! _MACHINE_FPU_H_ */
|