Stub FPU driver -- identifies FPUs and warns they aren't supported. e.g:
cpu0 (root): ARM2 fpu0 at cpu0: FPPC/WE32206 fpu0: WARNING: FPU type not supported by kernel
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bjh21
parent
1da6122f1e
commit
95920110c7
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@ -1,4 +1,4 @@
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/* $NetBSD: cpu.c,v 1.2 2000/12/11 23:46:50 bjh21 Exp $ */
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/* $NetBSD: cpu.c,v 1.3 2000/12/23 13:37:03 bjh21 Exp $ */
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/*-
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* Copyright (c) 2000 Ben Harris
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@ -33,7 +33,7 @@
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#include <sys/param.h>
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__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.2 2000/12/11 23:46:50 bjh21 Exp $");
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__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.3 2000/12/23 13:37:03 bjh21 Exp $");
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#include <sys/device.h>
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#include <sys/proc.h>
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@ -50,6 +50,7 @@ __KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.2 2000/12/11 23:46:50 bjh21 Exp $");
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static int cpu_match(struct device *, struct cfdata *, void *);
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static void cpu_attach(struct device *, struct device *, void *);
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static int cpu_search(struct device *, struct cfdata *, void *);
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static register_t cpu_identify(void);
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#ifdef CPU_ARM3
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static void cpu_arm3_setup(struct device *, int);
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@ -115,8 +116,19 @@ cpu_attach(struct device *parent, struct device *self, void *aux)
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printf("%s: WARNING: CPU type not supported by kernel\n",
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self->dv_xname);
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config_interrupts(self, cpu_delay_calibrate);
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config_search(cpu_search, self, NULL);
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}
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static int
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cpu_search(struct device *parent, struct cfdata *cf, void *aux)
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{
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if ((cf->cf_attach->ca_match)(parent, cf, NULL) > 0)
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config_attach(parent, cf, NULL, NULL);
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return 0;
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}
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static register_t
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cpu_identify()
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{
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@ -0,0 +1,119 @@
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/* $NetBSD: fpu.c,v 1.1 2000/12/23 13:37:03 bjh21 Exp $ */
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/*-
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* Copyright (c) 2000 Ben Harris
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific 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 BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* This file is part of NetBSD/arm26 -- a port of NetBSD to ARM2/3 machines. */
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/*
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* fpu.c - Floating point unit support
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*/
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#include <sys/param.h>
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__KERNEL_RCSID(0, "$NetBSD: fpu.c,v 1.1 2000/12/23 13:37:03 bjh21 Exp $");
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#include <sys/device.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/user.h>
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#include <machine/fpureg.h>
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#include <machine/pcb.h>
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#include "opt_fputypes.h"
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static int fpu_match(struct device *, struct cfdata *, void *);
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static void fpu_attach(struct device *, struct device *, void *);
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static register_t fpu_identify(void);
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register_t fpu_type;
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struct fpu_softc {
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struct device sc_dev;
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};
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struct cfattach fpu_ca = {
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sizeof(struct fpu_softc), fpu_match, fpu_attach
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};
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/* cf_flags bits */
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#define CFF_ENABLE 0x00000001
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static int
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fpu_match(struct device *parent, struct cfdata *cf, void *aux)
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{
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if (cf->cf_unit != 0)
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return 0;
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return fpu_identify() != 0;
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}
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static void
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fpu_attach(struct device *parent, struct device *self, void *aux)
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{
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int supported;
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printf(": ");
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fpu_type = fpu_identify();
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supported = 0;
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switch (fpu_type) {
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case FPSR_SYSID_FPPC:
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printf("FPPC/WE32206");
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#ifdef FPU_FPPC
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/* XXX Uncomment when we have minimal support. */
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/* supported = 1; */
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#endif
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break;
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case FPSR_SYSID_FPA:
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printf("FPA");
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#ifdef FPU_FPA
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/* XXX Uncomment when we have minimal support. */
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/* supported = 1; */
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#endif
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break;
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default:
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printf("Unknown type, ID=0x%02x", fpu_type >> 24);
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break;
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}
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printf("\n");
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if (!supported)
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printf("%s: WARNING: FPU type not supported by kernel\n",
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self->dv_xname);
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}
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static register_t
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fpu_identify()
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{
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label_t here;
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volatile register_t fpsr;
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if (setjmp(&here) == 0) {
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curproc->p_addr->u_pcb.pcb_onundef_lj = &here;
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fpsr = 0;
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asm volatile ("rfs %0" : "=r" (fpsr));
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}
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curproc->p_addr->u_pcb.pcb_onundef_lj = NULL;
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return fpsr & FPSR_SYSID_MASK;
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}
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@ -1,4 +1,4 @@
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# $NetBSD: files.arm26,v 1.9 2000/12/20 10:57:38 bjh21 Exp $
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# $NetBSD: files.arm26,v 1.10 2000/12/23 13:37:02 bjh21 Exp $
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# Copyright (c) 1997, 1998, 2000 Ben Harris
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# All rights reserved.
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@ -41,11 +41,17 @@ major {sd = 5}
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major {cd = 6}
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# CPU
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device cpu
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device cpu { }
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attach cpu at root
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defopt opt_cputypes.h CPU_ARM2 CPU_ARM250 CPU_ARM3
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file arch/arm26/arm26/cpu.c cpu
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# Floating-point unit
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device fpu
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attach fpu at cpu
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defopt opt_fputypes.h FPU_FPPC FPU_FPA
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file arch/arm26/arm26/fpu.c fpu needs-flag
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# I/O bus (on the far side of the address and data latches)
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device iobus { base = -1 }
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attach iobus at root
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@ -0,0 +1,61 @@
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/* $NetBSD: fpureg.h,v 1.1 2000/12/23 13:37:03 bjh21 Exp $ */
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/*
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* ARM FPU definitions
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*/
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/* System ID byte */
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#define FPSR_SYSID_MASK 0xff000000
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#define FPSR_SYSID_FPPC 0x80000000
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#define FPSR_SYSID_FPA 0x81000000
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/* Trap enable bits */
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#define FPSR_TE_IVO 0x00010000 /* InValid Operation */
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#define FPSR_TE_DVZ 0x00020000 /* DiVision by Zero */
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#define FPSR_TE_OFL 0x00040000 /* OverFLow */
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#define FPSR_TE_UFL 0x00080000 /* UnderFLow */
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#define FPSR_TE_INX 0x00100000 /* INeXact */
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/* System control byte (FPA only) */
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#define FPSR_CTL_ND 0x00000100 /* No Denormalised numbers */
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#define FPSR_CTL_NE 0x00000200 /* NaN Exception */
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#define FPSR_CTL_SO 0x00000400 /* Synchronous Operation */
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#define FPSR_CTL_EP 0x00000800 /* Expanded Packed decimal */
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#define FPSR_CTL_AC 0x00001000 /* Alternative C flag */
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/* Cumulative exception bits */
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#define FPSR_EX_IVO 0x00000001 /* InValid Operation */
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#define FPSR_EX_DVZ 0x00000002 /* DiVision by Zero */
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#define FPSR_EX_OFL 0x00000004 /* OverFLow */
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#define FPSR_EX_UFL 0x00000008 /* UnderFLow */
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#define FPSR_EX_INX 0x00000010 /* INeXact */
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/*
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* FPPC FPCR
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*/
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#define FPPC_FPCR_DA 0x00000001 /* Disable */
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#define FPPC_FPCR_EX 0x00000002 /* FP exception occurred */
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#define FPPC_FPCR_AS 0x00000004 /* Last exception was async */
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#define FPPC_FPCR_SBM 0x00000010 /* Use supervisor bank 'm' */
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#define FPPC_FPCR_SBN 0x00000020 /* Use supervisor bank 'n' */
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#define FPPC_FPCR_SBD 0x00000040 /* Use supervisor bank 'd' */
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#define FPPC_FPCR_PR 0x00000080 /* Last RMF gave partial remainder */
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/*
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* FPA FPCR
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* This is provisional, from the RISC OS 3 PRM
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*/
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#define FPA_FPCR_S2 0x0000000f /* AU source register 2 */
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#define FPA_FPCR_OP 0x00f08010 /* AU operation code */
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#define FPA_FPCR_RM 0x00000060 /* AU rounding mode */
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#define FPA_FPCR_PR 0x00080080 /* AU precision */
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#define FPA_FPCR_EN 0x00000100 /* Enable FPA */
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#define FPA_FPCR_RE 0x00000200 /* Rounding exception */
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#define FPA_FPCR_AB 0x00000400 /* Asynchronous bounce */
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#define FPA_FPCR_SB 0x00000800 /* Synchronous bounce */
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#define FPA_FPCR_DS 0x00007000 /* AU destination register */
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#define FPA_FPCR_S1 0x00070000 /* AU source register 1 */
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#define FPA_FPCR_EO 0x04000000 /* Exponent overflow */
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#define FPA_FPCR_MO 0x08000000 /* Mantissa overflow */
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#define FPA_FPCR_IE 0x10000000 /* Inexact bit */
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#define FPA_FPCR_RU 0x80000000 /* Rounded up bit */
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