338 lines
8.5 KiB
C
338 lines
8.5 KiB
C
/* $NetBSD: armfpe_init.c,v 1.8 1996/06/12 19:37:03 mark 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 Brini.
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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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/*#define DEBUG*/
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#include <sys/param.h>
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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/device.h>
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#include <sys/acct.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_param.h>
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#include <machine/cpu.h>
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#include <machine/cpus.h>
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#include <machine/katelib.h>
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#include <machine/frame.h>
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#include "armfpe.h" /* Prototypes for things */
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extern int want_resched;
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extern u_int fpe_nexthandler;
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void undefinedinstruction_bounce __P(());
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void arm_fpe_exception_glue __P((int exception));
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void arm_fpe_panic __P(());
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void undefined_entry __P(());
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void arm_fpe_post_proc_glue __P(());
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/*
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* A module header, pointing into the module
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*/
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extern u_int arm_fpe_mod[];
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extern u_int undefined_handler_address;
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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 char *exception_errors[] = {
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"Floating point invalid operation",
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"Floating point division by zero (0)",
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"Floating point overflow",
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"Floating point underflow",
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"Floating point operation inexact",
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"Floating point major faliure... core fault trapped... not good!"
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};
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/*
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* Relocate the FPE.
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*/
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void
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arm_fpe_mod_reloc(void)
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{
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int cnt;
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/* Go through the module header, and convert all offsets into absolute
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* addresses. Careful here - the last two fields of the header do _NOT_
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* want to be relocated!
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*/
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for (cnt = 0; cnt < (sizeof(arm_fpe_mod_hdr_t) >> 2) - 2; cnt ++) {
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#ifdef DEBUG
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printf("FPE: entry %02x = %08x ", cnt, arm_fpe_mod[cnt]);
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#endif
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arm_fpe_mod[cnt] += (u_int) arm_fpe_mod;
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#ifdef DEBUG
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printf(" reloc=%08x\n", arm_fpe_mod[cnt]);
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#endif
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}
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/* Print a startup message, and a couple of variables needed, these may need
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* checking to make *sure* they are OK!
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*/
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#ifdef DEBUG
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printf("FPE: global workspace size = %d bytes, context size = %d bytes\n",
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arm_fpe_mod_hdr->WorkspaceLength, arm_fpe_mod_hdr->ContextLength);
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printf("FPE: base=%08x\n", (u_int)arm_fpe_mod);
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#endif
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}
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/*
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* Initialisation point. The kernel calls this during the configuration of the cpu
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* 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(cpu)
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cpu_t *cpu;
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{
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int error;
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cpu->fpu_class = FPU_CLASS_FPE;
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cpu->fpu_type = FPU_TYPE_ARMLTD_FPE;
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strcpy(cpu->fpu_model, "Advanced RISC Machines floating point emulator");
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error = arm_fpe_boot(cpu);
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if (error != 0) {
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strcat(cpu->fpu_model, " - boot failed");
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return(1);
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}
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/* Return with start failure so the old FPE is installed */
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/* strcat(cpu->fpu_model, " - boot aborted");*/
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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(cpu)
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cpu_t *cpu;
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{
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u_int workspace;
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int id;
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arm_fpe_mod_hdr_t *arm_fpe_mod_hdr = (arm_fpe_mod_hdr_t *)arm_fpe_mod;
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/* First things first ... Relocate the FPE pointers */
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arm_fpe_mod_reloc();
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/* Now we must do some memory allocation */
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workspace = (u_int)malloc(arm_fpe_mod_hdr->WorkspaceLength, M_DEVBUF, M_NOWAIT);
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#ifdef DEBUG
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printf("Gloabl workspace at 0x%08x\n", workspace);
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#endif
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if (!workspace)
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return(ENOMEM);
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*arm_fpe_mod_hdr->main_ws_ptr_addr = workspace;
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*arm_fpe_mod_hdr->local_handler_ptr_addr = (u_int)&undefined_handler_address;
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*arm_fpe_mod_hdr->old_handler_ptr_addr = undefined_handler_address;
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/* Initialise out gloable workspace */
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#ifdef DEBUG
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printf("Initing workspace ");
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#endif
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id = arm_fpe_core_initws(workspace, (u_int)&fpe_nexthandler, (u_int)&fpe_nexthandler);
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if (id == FPU_TYPE_FPA11) {
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cpu->fpu_class = FPU_CLASS_FPA;
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cpu->fpu_type = FPU_TYPE_FPA11;
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}
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#ifdef DEBUG
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printf("id=%08x\n", id);
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#endif
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/* Set up an exception handler */
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*arm_fpe_mod_hdr->exc_handler_ptr_addr = (u_int)arm_fpe_exception_glue;
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/* Set up post instruction handler */
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#if defined(CPU_ARM6) || defined(CPU_ARM7)
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*arm_fpe_mod_hdr->fp_post_proc_addr = (((((u_int)arm_fpe_post_proc_glue -
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(u_int)arm_fpe_mod_hdr->fp_post_proc_addr - 8)>>2) & 0x00ffffff) | 0xea000000);
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#ifdef DEBUG
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printf("arm_fpe_mod_hdr->fp_post_proc_addr = %08x (%08x)",
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arm_fpe_mod_hdr->fp_post_proc_addr,
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*arm_fpe_mod_hdr->fp_post_proc_addr);
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#endif
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#else
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#error ARMFPE currently only supports ARM6 and ARM7
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#endif
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#ifdef DEBUG
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printf("Initialising proc0 FPE context\n");
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#endif
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/* Initialise proc0's FPE context */
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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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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 u_int s;
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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_md.md_regs = 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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* Since we are curproc, a clock interrupt could
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* change our priority without changing run queues
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* (the running process is not kept on a run queue).
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* If this happened after we setrunqueue ourselves but
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* before we switch()'ed, we might not be on the queue
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* indicated by our priority
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*/
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s = splstatclock();
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setrunqueue(p);
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p->p_stats->p_ru.ru_nivcsw++;
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mi_switch();
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(void)splx(s);
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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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if (pc <0x1000 || pc > 0xefc00000)
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printf("armfpe_postproc: pc=%08x\n", pc);
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/* addupc_task(p, pc, (int)(p->p_sticks - sticks) * psratio);*/
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addupc_task(p, pc, (int)(p->p_sticks - p->p_sticks) * psratio);
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}
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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, pc, fpframe)
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int exception;
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u_int pc;
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u_int fpframe;
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{
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if (exception >= 0 && exception < 6)
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printf("fpe exception: %d - %s\n", exception, exception_errors[exception]);
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else
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printf("fpe exception: %d - unknown\n", exception);
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trapsignal(curproc, SIGFPE, exception);
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printf("PC=%08x\n", ReadWord(fpframe + 60));
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userret(curproc, pc, curproc->p_sticks);
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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, (int *)&fpcontext, 0);
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arm_fpe_core_loadcontext(c2, (int *)&fpcontext);
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}
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/* End of armfpe_init.c */
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