/* $OpenBSD: locore_c.c,v 1.15 2025/05/21 09:06:58 mpi Exp $ */ /* $NetBSD: locore_c.c,v 1.13 2006/03/04 01:13:35 uwe Exp $ */ /*- * Copyright (c) 1996, 1997, 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION 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. */ /*- * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * 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. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS 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. * * @(#)Locore.c */ /*- * Copyright (c) 1993, 1994, 1995, 1996, 1997 * Charles M. Hannum. All rights reserved. * Copyright (c) 1992 Terrence R. Lambert. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * 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 the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS 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. * * @(#)Locore.c */ #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/sched.h> #include <uvm/uvm_extern.h> #include <sh/locore.h> #include <sh/cpu.h> #include <sh/pcb.h> #include <sh/pmap.h> #include <sh/mmu_sh3.h> #include <sh/mmu_sh4.h> #include <sh/ubcreg.h> void (*__sh_switch_resume)(struct proc *); void cpu_switch_prepare(struct proc *, struct proc *); /* * Prepare context switch from oproc to nproc. * This code is used by cpu_switchto. */ void cpu_switch_prepare(struct proc *oproc, struct proc *nproc) { nproc->p_stat = SONPROC; if (oproc && (oproc->p_md.md_flags & MDP_STEP)) _reg_write_2(SH_(BBRB), 0); curpcb = nproc->p_md.md_pcb; pmap_activate(nproc); if (nproc->p_md.md_flags & MDP_STEP) { int pm_asid = nproc->p_vmspace->vm_map.pmap->pm_asid; _reg_write_2(SH_(BBRB), 0); _reg_write_4(SH_(BARB), nproc->p_md.md_regs->tf_spc); _reg_write_1(SH_(BASRB), pm_asid); _reg_write_1(SH_(BAMRB), 0); _reg_write_2(SH_(BRCR), 0x0040); _reg_write_2(SH_(BBRB), 0x0014); } curproc = nproc; } void cpu_exit(struct proc *p) { if (p->p_md.md_flags & MDP_STEP) _reg_write_2(SH_(BBRB), 0); } #ifndef P1_STACK #ifdef SH3 /* * void sh3_switch_setup(struct proc *p): * prepare kernel stack PTE table. TLB miss handler check these. */ void sh3_switch_setup(struct proc *p) { pt_entry_t *pte; struct md_upte *md_upte = p->p_md.md_upte; uint32_t vpn; int i; vpn = (uint32_t)p->p_addr; vpn &= ~PGOFSET; for (i = 0; i < UPAGES; i++, vpn += PAGE_SIZE, md_upte++) { pte = __pmap_kpte_lookup(vpn); KDASSERT(pte && *pte != 0); md_upte->addr = vpn; md_upte->data = (*pte & PG_HW_BITS) | PG_D | PG_V; } } #endif /* SH3 */ #ifdef SH4 /* * void sh4_switch_setup(struct proc *p): * prepare kernel stack PTE table. sh4_switch_resume wired this PTE. */ void sh4_switch_setup(struct proc *p) { pt_entry_t *pte; struct md_upte *md_upte = p->p_md.md_upte; uint32_t vpn; int i, e; vpn = (uint32_t)p->p_addr; vpn &= ~PGOFSET; e = SH4_UTLB_ENTRY - UPAGES; for (i = 0; i < UPAGES; i++, e++, vpn += PAGE_SIZE) { pte = __pmap_kpte_lookup(vpn); KDASSERT(pte && *pte != 0); /* Address array */ md_upte->addr = SH4_UTLB_AA | (e << SH4_UTLB_E_SHIFT); md_upte->data = vpn | SH4_UTLB_AA_D | SH4_UTLB_AA_V; md_upte++; /* Data array */ md_upte->addr = SH4_UTLB_DA1 | (e << SH4_UTLB_E_SHIFT); md_upte->data = (*pte & PG_HW_BITS) | SH4_UTLB_DA1_D | SH4_UTLB_DA1_V; md_upte++; } } #endif /* SH4 */ #endif /* !P1_STACK */
