More FPU-state-saving infrastructure. Not useful yet.
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bjh21
parent
f68d9de78d
commit
6189064e69
@ -1,7 +1,7 @@
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/* $NetBSD: fpu.c,v 1.1 2000/12/23 13:37:03 bjh21 Exp $ */
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/* $NetBSD: fpu.c,v 1.2 2001/01/12 13:23:49 bjh21 Exp $ */
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/*-
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* Copyright (c) 2000 Ben Harris
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* Copyright (c) 2000, 2001 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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@ -33,7 +33,7 @@
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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 $");
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__KERNEL_RCSID(0, "$NetBSD: fpu.c,v 1.2 2001/01/12 13:23:49 bjh21 Exp $");
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#include <sys/device.h>
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#include <sys/proc.h>
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@ -41,6 +41,7 @@ __KERNEL_RCSID(0, "$NetBSD: fpu.c,v 1.1 2000/12/23 13:37:03 bjh21 Exp $");
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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 <arch/arm26/arm26/fpuvar.h>
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#include "opt_fputypes.h"
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@ -48,53 +49,54 @@ 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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struct fpu_softc *the_fpu;
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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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return the_fpu == NULL && 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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struct fpu_softc *sc = (void *)self;
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the_fpu = sc;
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printf(": ");
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fpu_type = fpu_identify();
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sc->sc_fputype = fpu_identify();
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supported = 0;
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switch (fpu_type) {
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switch (sc->sc_fputype) {
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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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supported = 1;
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sc->sc_ctxload = fpctx_load_fppc;
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sc->sc_ctxsave = fpctx_save_fppc;
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sc->sc_enable = fpu_enable_fppc;
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sc->sc_disable = fpu_disable_fppc;
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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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supported = 1;
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sc->sc_ctxload = fpctx_load_fpa;
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sc->sc_ctxsave = fpctx_save_fpa;
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sc->sc_enable = fpu_enable_fpa;
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sc->sc_disable = fpu_disable_fpa;
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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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printf("Unknown type, ID=0x%02x", sc->sc_fputype >> 24);
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break;
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}
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printf("\n");
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@ -117,3 +119,17 @@ fpu_identify()
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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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void
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fpu_swapout(struct proc *p)
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{
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struct pcb *pcb;
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pcb = &p->p_addr->u_pcb;
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if (pcb->pcb_flags & PCB_OWNFPU) {
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the_fpu->sc_ctxsave(&pcb->pcb_ff);
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the_fpu->sc_disable();
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the_fpu->sc_owner = NULL;
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pcb->pcb_flags &= ~PCB_OWNFPU;
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}
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}
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162
sys/arch/arm26/arm26/fpu_asm.S
Normal file
162
sys/arch/arm26/arm26/fpu_asm.S
Normal file
@ -0,0 +1,162 @@
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/* $NetBSD: fpu_asm.S,v 1.1 2001/01/12 13:23:49 bjh21 Exp $ */
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/*-
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* Copyright (c) 2001 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_asm.S - Floating point unit support
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*/
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#include <machine/asm.h>
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RCSID("$NetBSD: fpu_asm.S,v 1.1 2001/01/12 13:23:49 bjh21 Exp $")
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#include <machine/fpureg.h>
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#include "opt_fputypes.h"
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#ifdef FPU_FPA
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/*
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* void fpctx_save_fpa(struct fpframe *);
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*/
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ENTRY(fpctx_save_fpa)
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rfs r1
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str r1, [r0]
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sfm f0, 4, [r0, #(4 + 12 * 0)]
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sfm f4, 4, [r0, #(4 + 12 * 4)]
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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/*
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* void fpctx_load_fpa(struct fpframe *);
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*/
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ENTRY(fpctx_load_fpa)
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lfm f0, 4, [r0, #(4 + 12 * 0)]
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lfm f4, 4, [r0, #(4 + 12 * 4)]
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ldr r1, [r0]
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wfs r1
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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/*
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* void fpu_enable_fpa(void);
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*/
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ENTRY(fpu_enable_fpa)
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mov r0, #FPA_FPCR_EN
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wfc r0
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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#endif
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/*
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* void fpu_disable_fpa(void);
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*/
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ENTRY(fpu_disable_fpa)
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mov r0, #0
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wfc r0
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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#ifdef FPU_FPPC
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/*
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* void fpctx_save_fppc(struct fpframe *);
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*/
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ENTRY(fpctx_save_fppc)
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rfs r1
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str r1, [r0]
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stfe f0, [r0, #(4 + 12 * 0)]
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stfe f1, [r0, #(4 + 12 * 1)]
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stfe f2, [r0, #(4 + 12 * 2)]
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stfe f3, [r0, #(4 + 12 * 3)]
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stfe f4, [r0, #(4 + 12 * 4)]
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stfe f5, [r0, #(4 + 12 * 5)]
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stfe f6, [r0, #(4 + 12 * 6)]
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stfe f7, [r0, #(4 + 12 * 7)]
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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/*
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* void fpctx_load_fppc(struct fpframe *);
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*/
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ENTRY(fpctx_load_fppc)
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ldfe f0, [r0, #(4 + 12 * 0)]
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ldfe f1, [r0, #(4 + 12 * 1)]
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ldfe f2, [r0, #(4 + 12 * 2)]
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ldfe f3, [r0, #(4 + 12 * 3)]
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ldfe f4, [r0, #(4 + 12 * 4)]
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ldfe f5, [r0, #(4 + 12 * 5)]
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ldfe f6, [r0, #(4 + 12 * 6)]
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ldfe f7, [r0, #(4 + 12 * 7)]
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ldr r1, [r0]
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wfs r1
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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/*
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* void fpu_enable_fppc(void);
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*/
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ENTRY(fpu_enable_fppc)
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rfc r0
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orr r0, r0, #FPPC_FPCR_DA
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wfc r0
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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#endif
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/*
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* void fpu_disable_fppc(void);
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*/
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ENTRY(fpu_disable_fppc)
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rfc r0
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bic r0, r0, #FPPC_FPCR_DA
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wfc r0
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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