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File: [local] / sys / arch / hppa / spmath / divsim.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:05:45 2008 UTC (16 years, 6 months ago) by nbrk
Import of OpenBSD 4.2 release kernel tree with initial code to support Jornada 720/728, StrongARM 1110-based handheld PC. At this point kernel roots on NFS and boots into vfs_mountroot() and traps. What is supported: - glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode (needs some palette tweaks for non black/white/blue colors, i think) - saic, SA11x0 interrupt controller (needs cleanup) - sacom, SA11x0 UART (supported only as boot console for now) - SA11x0 GPIO controller fully supported (but can't handle multiple interrupt handlers on one gpio pin) - sassp, SSP port on SA11x0 that attaches spibus - Jornada microcontroller (jmcu) to control kbd, battery, etc throught the SPI bus (wskbd attaches on jmcu, but not tested) - tod functions seem work - initial code for SA-1111 (chip companion) : this is TODO Next important steps, i think: - gpio and intc on sa1111 - pcmcia support for sa11x0 (and sa1111 help logic) - REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs) - root on wd0! (using already supported PCMCIA-ATA) |
/* $OpenBSD: divsim.c,v 1.5 2002/05/07 22:19:30 mickey Exp $ */ /* (c) Copyright 1986 HEWLETT-PACKARD COMPANY To anyone who acknowledges that this file is provided "AS IS" without any express or implied warranty: permission to use, copy, modify, and distribute this file for any purpose is hereby granted without fee, provided that the above copyright notice and this notice appears in all copies, and that the name of Hewlett-Packard Company not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. Hewlett-Packard Company makes no representations about the suitability of this software for any purpose. */ /* @(#)divsim.c: Revision: 1.6.88.1 Date: 93/12/07 15:05:56 */ #include "md.h" void divsim(opnd1,opnd2,result) int opnd1, opnd2; struct mdsfu_register *result; { int sign, op1_sign; /* check divisor for zero */ if (opnd2 == 0) { overflow = TRUE; return; } /* get sign of result */ sign = opnd1 ^ opnd2; /* get absolute value of operands */ if (opnd1 < 0) { opnd1 = -opnd1; op1_sign = TRUE; } else op1_sign = FALSE; if (opnd2 < 0) opnd2 = -opnd2; /* check for opnd2 == -2**31 */ if (opnd2 < 0) { if (opnd1 == opnd2) { result_hi = 0; /* remainder = 0 */ result_lo = 1; } else { result_hi = opnd1; /* remainder = opnd1 */ result_lo = 0; } } else { /* do the divide */ divu(0,opnd1,opnd2,result); /* * check for overflow * * at this point, the only way we can get overflow * is with opnd1 = -2**31 and opnd2 = -1 */ if (sign>0 && result_lo<0) { overflow = TRUE; return; } } overflow = FALSE; /* return positive residue */ if (op1_sign && result_hi) { result_hi = opnd2 - result_hi; if (++result_lo < 0) { overflow = TRUE; return; } } /* return appropriately signed result */ if (sign<0) result_lo = -result_lo; return; }