/* $NetBSD: armfpe_init.c,v 1.6 1996/03/18 19:55:01 mark 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 Brini. * 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 */ /*#define DEBUG*/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "armfpe.h" /* Prototypes for things */ extern int want_resched; extern u_int fpe_nexthandler; void undefinedinstruction_bounce __P(()); void arm_fpe_exception_glue __P((int exception)); void arm_fpe_panic __P(()); void undefined_entry __P(()); void arm_fpe_post_proc_glue __P(()); /* * A module header, pointing into the module */ extern u_int arm_fpe_mod[]; extern u_int undefined_handler_address; /* * Error messages for the various exceptions, numbered 0-5 */ static char *exception_errors[] = { "Floating point invalid operation", "Floating point division by zero (0)", "Floating point overflow", "Floating point underflow", "Floating point operation inexact", "Floating point major faliure... core fault trapped... not good!" }; /* * Relocate the FPE. */ void arm_fpe_mod_reloc(void) { int cnt; arm_fpe_mod_hdr_t *arm_fpe_mod_hdr = (arm_fpe_mod_hdr_t *)arm_fpe_mod; /* Go through the module header, and convert all offsets into absolute * addresses. Careful here - the last two fields of the header do _NOT_ * want to be relocated! */ for (cnt = 0; cnt < (sizeof(arm_fpe_mod_hdr_t) >> 2) - 2; cnt ++) { #ifdef DEBUG printf("FPE: entry %02x = %08x ", cnt, arm_fpe_mod[cnt]); #endif arm_fpe_mod[cnt] += (u_int) arm_fpe_mod; #ifdef DEBUG printf(" reloc=%08x\n", arm_fpe_mod[cnt]); #endif } /* Print a startup message, and a couple of variables needed, these may need * checking to make *sure* they are OK! */ #ifdef DEBUG printf("FPE: global workspace size = %d bytes, context size = %d bytes\n", arm_fpe_mod_hdr->WorkspaceLength, arm_fpe_mod_hdr->ContextLength); printf("FPE: base=%08x\n", (u_int)arm_fpe_mod); #endif } /* * 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(cpu) cpu_t *cpu; { int error; cpu->fpu_class = FPU_CLASS_FPE; cpu->fpu_type = FPU_TYPE_ARMLTD_FPE; strcpy(cpu->fpu_model, "Advanced RISC Machines floating point emulator"); error = arm_fpe_boot(); if (error != 0) { strcat(cpu->fpu_model, " - boot failed"); return(1); } /* Return with start failure so the old FPE is installed */ /* strcat(cpu->fpu_model, " - boot aborted");*/ 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(void) { u_int workspace; int id; arm_fpe_mod_hdr_t *arm_fpe_mod_hdr = (arm_fpe_mod_hdr_t *)arm_fpe_mod; /* First things first ... Relocate the FPE pointers */ arm_fpe_mod_reloc(); /* Now we must do some memory allocation */ workspace = (u_int)malloc(arm_fpe_mod_hdr->WorkspaceLength, M_DEVBUF, M_NOWAIT); #ifdef DEBUG printf("Gloabl workspace at 0x%08x\n", workspace); #endif if (!workspace) return(ENOMEM); *arm_fpe_mod_hdr->main_ws_ptr_addr = workspace; *arm_fpe_mod_hdr->local_handler_ptr_addr = (u_int)&undefined_handler_address; *arm_fpe_mod_hdr->old_handler_ptr_addr = undefined_handler_address; /* Initialise out gloable workspace */ #ifdef DEBUG printf("Initing workspace "); #endif id = arm_fpe_core_initws(workspace, (u_int)&fpe_nexthandler, (u_int)&fpe_nexthandler); #ifdef DEBUG printf("id=%08x\n", id); #endif /* Set up an exception handler */ *arm_fpe_mod_hdr->exc_handler_ptr_addr = (u_int)arm_fpe_exception_glue; /* Set up post instruction handler */ #if defined(CPU_ARM6) || defined(CPU_ARM7) *arm_fpe_mod_hdr->fp_post_proc_addr = (((((u_int)arm_fpe_post_proc_glue - (u_int)arm_fpe_mod_hdr->fp_post_proc_addr - 8)>>2) & 0x00ffffff) | 0xea000000); #ifdef DEBUG printf("arm_fpe_mod_hdr->fp_post_proc_addr = %08x (%08x)", arm_fpe_mod_hdr->fp_post_proc_addr, *arm_fpe_mod_hdr->fp_post_proc_addr); #endif #else #error ARMFPE currently only supports ARM6 and ARM7 #endif #ifdef DEBUG printf("Initialising proc0 FPE context\n"); #endif /* Initialise proc0's FPE context */ arm_fpe_core_initcontext(FP_CONTEXT(&proc0)); arm_fpe_core_changecontext(FP_CONTEXT(&proc0)); return(0); } /* * Callback routine from the FPE when instruction emulation completes */ void arm_fpe_postproc(fpframe, frame) u_int fpframe; struct trapframe *frame; { register u_int s; register int sig; register struct proc *p; p = curproc; p->p_md.md_regs = frame; /* take pending signals */ while ((sig = (CURSIG(p))) != 0) { postsig(sig); } p->p_priority = p->p_usrpri; if (want_resched) { /* * Since we are curproc, a clock interrupt could * change our priority without changing run queues * (the running process is not kept on a run queue). * If this happened after we setrunqueue ourselves but * before we switch()'ed, we might not be on the queue * indicated by our priority */ s = splstatclock(); setrunqueue(p); p->p_stats->p_ru.ru_nivcsw++; mi_switch(); (void)splx(s); 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); if (pc <0x1000 || pc > 0xefc00000) printf("armfpe_postproc: pc=%08x\n", pc); /* addupc_task(p, pc, (int)(p->p_sticks - sticks) * psratio);*/ addupc_task(p, pc, (int)(p->p_sticks - p->p_sticks) * psratio); } curpriority = p->p_priority; } /* * Callback routine from the FPE when an exception occurs. */ void arm_fpe_exception(exception, pc, fpframe) int exception; u_int pc; u_int fpframe; { if (exception >= 0 && exception < 6) printf("fpe exception: %d - %s\n", exception, exception_errors[exception]); else printf("fpe exception: %d - unknown\n", exception); trapsignal(curproc, SIGFPE, exception); printf("PC=%08x\n", ReadWord(fpframe + 60)); userret(curproc, pc, curproc->p_sticks); } void arm_fpe_copycontext(c1, c2) u_int c1; u_int c2; { fp_context_frame_t fpcontext; arm_fpe_core_savecontext(c1, (int *)&fpcontext, 0); arm_fpe_core_loadcontext(c2, (int *)&fpcontext); } /* End of armfpe_init.c */