277 lines
6.9 KiB
C
277 lines
6.9 KiB
C
/* $NetBSD: armfpe_init.c,v 1.6 2003/01/17 22:28:50 thorpej Exp $ */
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/*
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* Copyright (C) 1996 Mark Brinicombe
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* Copyright (C) 1995 Neil A Carson.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Mark Brinicombe.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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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* RiscBSD kernel project
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*
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* arm_fpe.c
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*
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* Stuff needed to interface the ARM floating point emulator module to RiscBSD.
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*
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* Created : 22/10/95
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*/
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#include <sys/param.h>
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__KERNEL_RCSID(0, "$NetBSD: armfpe_init.c,v 1.6 2003/01/17 22:28:50 thorpej Exp $");
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/malloc.h>
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#include <sys/acct.h>
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#include <uvm/uvm_extern.h>
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#include <machine/cpu.h>
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#include <arm/arm32/katelib.h>
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#include <machine/frame.h>
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#include <arm/fpe-arm/armfpe.h>
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extern int want_resched;
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extern u_int fpe_nexthandler;
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extern u_int fpe_arm_start[];
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extern arm_fpe_mod_hdr_t fpe_arm_header;
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extern u_int undefined_handler_address;
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u_int arm_fpe_old_handler_address;
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u_int arm_fpe_core_workspace;
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/*
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* Error messages for the various exceptions, numbered 0-5
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*/
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static const char *exception_errors[] = {
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"invalid operation",
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"division by zero (0)",
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"overflow",
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"underflow",
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"operation inexact",
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"major faliure... core fault trapped... not good!"
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};
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/*
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* Initialisation point. The kernel calls this during the configuration of
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* the cpu in order to install the FPE.
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* The FPE specification needs to be filled in the specified cpu_t structure
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* and the FPE needs to be installed on the CPU undefined instruction vector.
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*/
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int
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initialise_arm_fpe()
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{
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int error;
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printf("%s: FPE: %s\n",
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curcpu()->ci_dev->dv_xname, fpe_arm_header.core_identity_addr);
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error = arm_fpe_boot();
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if (error != 0) {
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printf("%s: FPE boot failed\n", curcpu()->ci_dev->dv_xname);
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return(1);
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}
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return(0);
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}
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/*
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* The actual FPE boot routine.
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* This has to do a number of things :
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* 1. Relocate the FPE - Note this requires write access to the kernel text area
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* 2. Allocated memory for the FPE
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* 3. Initialise the FPE
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*/
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int
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arm_fpe_boot()
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{
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u_int workspace;
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int id;
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#ifdef DEBUG
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/* Print a bit of debugging info */
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printf("FPE: base=%08x\n", (u_int)fpe_arm_start);
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printf("FPE: global workspace size = %d bytes, context size = %d bytes\n",
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fpe_arm_header.workspacelength, fpe_arm_header.contextlength);
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#endif
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/* Now we must do some memory allocation */
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workspace = (u_int)malloc(fpe_arm_header.workspacelength, M_DEVBUF, M_NOWAIT);
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if (!workspace)
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return(ENOMEM);
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arm_fpe_core_workspace = workspace;
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arm_fpe_old_handler_address = undefined_handler_address;
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/* Initialise out gloable workspace */
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id = arm_fpe_core_initws(workspace, (u_int)&fpe_nexthandler,
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(u_int)&fpe_nexthandler);
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if (id == 0x81)
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printf("%s: FPA11 found\n", curcpu()->ci_dev->dv_xname);
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else
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printf("%s: no FP hardware found\n",
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curcpu()->ci_dev->dv_xname);
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#ifdef DEBUG
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printf("fpe id=%08x\n", id);
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#endif
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/* Initialise proc0's FPE context and select it */
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arm_fpe_core_initcontext(FP_CONTEXT(&proc0));
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arm_fpe_core_changecontext(FP_CONTEXT(&proc0));
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/*
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* Set the default excpection mask. This will be inherited on
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* a fork when the context is copied.
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*
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* XXX - The is done with FP instructions - the only ones in
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* the kernel
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*/
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arm_fpe_set_exception_mask(FP_X_DZ | FP_X_OFL);
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return(0);
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}
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/*
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* Callback routine from the FPE when instruction emulation completes
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*/
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void
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arm_fpe_postproc(fpframe, frame)
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u_int fpframe;
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struct trapframe *frame;
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{
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register int sig;
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register struct proc *p;
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p = curproc;
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p->p_addr->u_pcb.pcb_tf = frame;
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/* take pending signals */
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while ((sig = (CURSIG(p))) != 0) {
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postsig(sig);
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}
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p->p_priority = p->p_usrpri;
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if (want_resched) {
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/*
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* We are being preempted.
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*/
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preempt(0);
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while ((sig = (CURSIG(p))) != 0) {
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postsig(sig);
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}
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}
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/* Profiling. */
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if (p->p_flag & P_PROFIL) {
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extern int psratio;
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u_int pc;
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pc = ReadWord(fpframe + 15*4);
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#ifdef DIAGNOSTIC
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if (pc < 0x1000 || pc > 0xefc00000)
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panic("armfpe_postproc: pc=%08x", pc);
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#endif
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addupc_task(p, pc, (int)(p->p_sticks - p->p_sticks) * psratio);
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}
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curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
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}
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/*
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* Callback routine from the FPE when an exception occurs.
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*/
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void
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arm_fpe_exception(exception, fpframe, frame)
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int exception;
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u_int fpframe;
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struct trapframe *frame;
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{
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if (exception >= 0 && exception < 6)
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printf("fpe exception: %s (%d)\n",
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exception_errors[exception], exception);
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else
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printf("fpe exception: unknown (%d)\n", exception);
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trapsignal(curproc, SIGFPE, exception << 8);
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userret(curproc);
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}
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void
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arm_fpe_copycontext(c1, c2)
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u_int c1;
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u_int c2;
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{
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fp_context_frame_t fpcontext;
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arm_fpe_core_savecontext(c1, &fpcontext, 0);
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arm_fpe_core_loadcontext(c2, &fpcontext);
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}
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/*
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* Warning the arm_fpe_getcontext() and arm_fpe_setcontext() functions
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* rely on the fact that the fp_context_frame_t type is structurally the
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* same as struct fpreg and thus can just cast the pointer.
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* If a change is made to either then a tempoary buffer will be needed
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* and the structure members copied indiviually.
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*/
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void arm_fpe_getcontext(p, fpregs)
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struct proc *p;
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struct fpreg *fpregs;
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{
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arm_fpe_core_savecontext(FP_CONTEXT(p), (fp_context_frame_t *)fpregs, 0);
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}
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void arm_fpe_setcontext(p, fpregs)
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struct proc *p;
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struct fpreg *fpregs;
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{
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arm_fpe_core_loadcontext(FP_CONTEXT(p), (fp_context_frame_t *)fpregs);
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}
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/* End of armfpe_init.c */
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