/* $NetBSD: armfpe_init.c,v 1.4 2002/03/10 15:29:54 bjh21 Exp $ */ /* * Copyright (C) 1996 Mark Brinicombe * Copyright (C) 1995 Neil A Carson. * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Mark Brinicombe. * 4. The name of the company nor the name of the author may be used to * endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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. * * RiscBSD kernel project * * arm_fpe.c * * Stuff needed to interface the ARM floating point emulator module to RiscBSD. * * Created : 22/10/95 */ #include __KERNEL_RCSID(0, "$NetBSD: armfpe_init.c,v 1.4 2002/03/10 15:29:54 bjh21 Exp $"); #include #include #include #include #include #include #include #include #include #include extern int want_resched; extern u_int fpe_nexthandler; extern u_int fpe_arm_start[]; extern arm_fpe_mod_hdr_t fpe_arm_header; extern u_int undefined_handler_address; u_int arm_fpe_old_handler_address; u_int arm_fpe_core_workspace; /* * Error messages for the various exceptions, numbered 0-5 */ static const char *exception_errors[] = { "invalid operation", "division by zero (0)", "overflow", "underflow", "operation inexact", "major faliure... core fault trapped... not good!" }; /* * Initialisation point. The kernel calls this during the configuration of * the cpu in order to install the FPE. * The FPE specification needs to be filled in the specified cpu_t structure * and the FPE needs to be installed on the CPU undefined instruction vector. */ int initialise_arm_fpe() { int error; printf("%s: FPE: %s\n", curcpu()->ci_dev->dv_xname, fpe_arm_header.core_identity_addr); error = arm_fpe_boot(); if (error != 0) { printf("%s: FPE boot failed\n", curcpu()->ci_dev->dv_xname); return(1); } return(0); } /* * The actual FPE boot routine. * This has to do a number of things : * 1. Relocate the FPE - Note this requires write access to the kernel text area * 2. Allocated memory for the FPE * 3. Initialise the FPE */ int arm_fpe_boot() { u_int workspace; int id; #ifdef DEBUG /* Print a bit of debugging info */ printf("FPE: base=%08x\n", (u_int)fpe_arm_start); printf("FPE: global workspace size = %d bytes, context size = %d bytes\n", fpe_arm_header.workspacelength, fpe_arm_header.contextlength); #endif /* Now we must do some memory allocation */ workspace = (u_int)malloc(fpe_arm_header.workspacelength, M_DEVBUF, M_NOWAIT); if (!workspace) return(ENOMEM); arm_fpe_core_workspace = workspace; arm_fpe_old_handler_address = undefined_handler_address; /* Initialise out gloable workspace */ id = arm_fpe_core_initws(workspace, (u_int)&fpe_nexthandler, (u_int)&fpe_nexthandler); if (id == 0x81) printf("%s: FPA11 found\n", curcpu()->ci_dev->dv_xname); else printf("%s: no FP hardware found\n", curcpu()->ci_dev->dv_xname); #ifdef DEBUG printf("fpe id=%08x\n", id); #endif /* Initialise proc0's FPE context and select it */ arm_fpe_core_initcontext(FP_CONTEXT(&proc0)); arm_fpe_core_changecontext(FP_CONTEXT(&proc0)); /* * Set the default excpection mask. This will be inherited on * a fork when the context is copied. * * XXX - The is done with FP instructions - the only ones in * the kernel */ arm_fpe_set_exception_mask(FP_X_DZ | FP_X_OFL); return(0); } /* * Callback routine from the FPE when instruction emulation completes */ void arm_fpe_postproc(fpframe, frame) u_int fpframe; struct trapframe *frame; { register int sig; register struct proc *p; p = curproc; p->p_addr->u_pcb.pcb_tf = frame; /* take pending signals */ while ((sig = (CURSIG(p))) != 0) { postsig(sig); } p->p_priority = p->p_usrpri; if (want_resched) { /* * We are being preempted. */ preempt(NULL); while ((sig = (CURSIG(p))) != 0) { postsig(sig); } } /* Profiling. */ if (p->p_flag & P_PROFIL) { extern int psratio; u_int pc; pc = ReadWord(fpframe + 15*4); #ifdef DIAGNOSTIC if (pc < 0x1000 || pc > 0xefc00000) panic("armfpe_postproc: pc=%08x\n", pc); #endif addupc_task(p, pc, (int)(p->p_sticks - p->p_sticks) * psratio); } curcpu()->ci_schedstate.spc_curpriority = p->p_priority; } /* * Callback routine from the FPE when an exception occurs. */ void arm_fpe_exception(exception, fpframe, frame) int exception; u_int fpframe; struct trapframe *frame; { if (exception >= 0 && exception < 6) printf("fpe exception: %s (%d)\n", exception_errors[exception], exception); else printf("fpe exception: unknown (%d)\n", exception); trapsignal(curproc, SIGFPE, exception << 8); userret(curproc); } void arm_fpe_copycontext(c1, c2) u_int c1; u_int c2; { fp_context_frame_t fpcontext; arm_fpe_core_savecontext(c1, &fpcontext, 0); arm_fpe_core_loadcontext(c2, &fpcontext); } /* * Warning the arm_fpe_getcontext() and arm_fpe_setcontext() functions * rely on the fact that the fp_context_frame_t type is structurally the * same as struct fpreg and thus can just cast the pointer. * If a change is made to either then a tempoary buffer will be needed * and the structure members copied indiviually. */ void arm_fpe_getcontext(p, fpregs) struct proc *p; struct fpreg *fpregs; { arm_fpe_core_savecontext(FP_CONTEXT(p), (fp_context_frame_t *)fpregs, 0); } void arm_fpe_setcontext(p, fpregs) struct proc *p; struct fpreg *fpregs; { arm_fpe_core_loadcontext(FP_CONTEXT(p), (fp_context_frame_t *)fpregs); } /* End of armfpe_init.c */