/* $NetBSD: fpu.h,v 1.9 2025/02/24 21:32:26 andvar Exp $ */ /*- * Copyright (c) 2001 Ross Harvey * All rights reserved. * * This software was written for NetBSD. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ #ifndef _ALPHA_FPU_H_ #define _ALPHA_FPU_H_ /* * Most of these next definitions were moved from <ieeefp.h>. Apparently the * names happen to match those exported by Compaq and Linux from their fpu.h * files. */ /* * Bits in the Alpha Floating Point Control register. This is the hardware * register, and should not be directly manipulated by application software. */ #define FPCR_SUM __BIT(63) /* Summary (OR of all exception bits) */ #define FPCR_INED __BIT(62) /* Inexact trap Disable */ #define FPCR_UNFD __BIT(61) /* Underflow trap Disable */ #define FPCR_UNDZ __BIT(60) /* Underflow to Zero */ #define FPCR_DYN_RM __BITS(58,59) /* Dynamic Rounding Mode */ /* 00 Chopped */ /* 01 Minus Infinity */ /* 10 Normal (round nearest) */ /* 11 Plus Infinity */ #define FPCR_IOV __BIT(57) /* Integer Overflow */ #define FPCR_INE __BIT(56) /* Inexact Result */ #define FPCR_UNF __BIT(55) /* Underflow */ #define FPCR_OVF __BIT(54) /* Overflow */ #define FPCR_DZE __BIT(53) /* Division By Zero */ #define FPCR_INV __BIT(52) /* Invalid Operation */ #define FPCR_OVFD __BIT(51) /* Overflow trap Disable */ #define FPCR_DZED __BIT(50) /* Division By Zero trap Disable */ #define FPCR_INVD __BIT(49) /* Invalid Operation trap Disable */ #define FPCR_DNZ __BIT(48) /* Denormal Operands to Zero */ #define FPCR_DNOD __BIT(47) /* Denormal Operation tap Disable */ #define FPCR_MIRRORED (FPCR_INE | FPCR_UNF | FPCR_OVF | FPCR_DZE | FPCR_INV) #define FPCR_MIR_START 52 /* NetBSD default - no traps enabled, round-to-nearest */ #define FPCR_DEFAULT (__SHIFTIN(FP_RN, FPCR_DYN_RM) | \ FPCR_INED | FPCR_UNFD | FPCR_OVFD | \ FPCR_DZED | FPCR_INVD | FPCR_DNOD) /* * IEEE Floating Point Control (FP_C) Quadword. This is a software * virtual register that abstracts the FPCR and software complation * performed by the kernel. * * The AARM specifies the bit positions of the software word used for * user mode interface to the control and status of the kernel completion * routines. Although it largely just redefines the FPCR, it shuffles * the bit order. The names of the bits are defined in the AARM, and * the definition prefix can easily be determined from public domain * programs written to either the Compaq or Linux interfaces, which * appear to be identical. * * Bits 63-48 are reserved for implementation software. * Bits 47-23 are reserved for future architecture definition. * Bits 16-12 are reserved for implementation software. * Bits 11-7 are reserved for future architecture definition. * Bit 0 is reserved for implementation software. */ #define IEEE_STATUS_DNO __BIT(22) /* Denormal Operand */ #define IEEE_STATUS_INE __BIT(21) /* Inexact Result */ #define IEEE_STATUS_UNF __BIT(20) /* Underflow */ #define IEEE_STATUS_OVF __BIT(19) /* Overflow */ #define IEEE_STATUS_DZE __BIT(18) /* Division By Zero */ #define IEEE_STATUS_INV __BIT(17) /* Invalid Operation */ #define IEEE_TRAP_ENABLE_DNO __BIT(6) /* Denormal Operation trap */ #define IEEE_TRAP_ENABLE_INE __BIT(5) /* Inexact Result trap */ #define IEEE_TRAP_ENABLE_UNF __BIT(4) /* Underflow trap */ #define IEEE_TRAP_ENABLE_OVF __BIT(3) /* Overflow trap */ #define IEEE_TRAP_ENABLE_DZE __BIT(2) /* Division By Zero trap */ #define IEEE_TRAP_ENABLE_INV __BIT(1) /* Invalid Operation trap */ #define IEEE_INHERIT __BIT(14) #define IEEE_MAP_UMZ __BIT(13) /* Map underflowed outputs to zero */ #define IEEE_MAP_DMZ __BIT(12) /* Map denormal inputs to zero */ #define FP_C_ALLBITS __BITS(1,22) #define FP_C_MIRRORED (IEEE_STATUS_INE | IEEE_STATUS_UNF | IEEE_STATUS_OVF \ | IEEE_STATUS_DZE | IEEE_STATUS_INV) #define FP_C_MIR_START 17 /* NetBSD default - no traps enabled (see FPCR default) */ #define FP_C_DEFAULT 0 #ifdef _KERNEL #define FLD_MASK(len) ((1UL << (len)) - 1) #define FLD_CLEAR(obj, origin, len) \ ((obj) & ~(FLD_MASK(len) << (origin))) #define FLD_INSERT(obj, origin, len, value) \ (FLD_CLEAR(obj, origin, len) | (value) << origin) #define FP_C_TO_NETBSD_MASK(fp_c) ((fp_c) >> 1 & 0x3f) #define FP_C_TO_NETBSD_FLAG(fp_c) ((fp_c) >> 17 & 0x3f) #define NETBSD_MASK_TO_FP_C(m) (((m) & 0x3f) << 1) #define NETBSD_FLAG_TO_FP_C(s) (((s) & 0x3f) << 17) #define CLEAR_FP_C_MASK(fp_c) ((fp_c) & ~(0x3f << 1)) #define CLEAR_FP_C_FLAG(fp_c) ((fp_c) & ~(0x3f << 17)) #define SET_FP_C_MASK(fp_c, m) (CLEAR_FP_C_MASK(fp_c) | NETBSD_MASK_TO_FP_C(m)) #define SET_FP_C_FLAG(fp_c, m) (CLEAR_FP_C_FLAG(fp_c) | NETBSD_FLAG_TO_FP_C(m)) #endif /* _KERNEL */ #endif /* _ALPHA_FPU_H_ */
