NetBSD-5.0.2/sys/arch/sh3/sh3/locore_c.c
/* $NetBSD: locore_c.c,v 1.29 2008/04/28 20:23:35 martin Exp $ */
/*-
* Copyright (c) 1996, 1997, 2002, 2007 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: locore_c.c,v 1.29 2008/04/28 20:23:35 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cpu.h>
#include <sys/user.h>
#include <sys/sched.h>
#include <sys/proc.h>
#include <sys/ras.h>
#include <uvm/uvm.h>
#include <uvm/uvm_extern.h>
#include <sh3/locore.h>
#include <sh3/pmap.h>
#include <sh3/mmu_sh3.h>
#include <sh3/mmu_sh4.h>
void cpu_switch_prepare(struct lwp *, struct lwp *);
void (*__sh_switch_resume)(struct lwp *);
/*
* Called from cpu_switchto after olwp's state has been saved.
* Prepare context switch to nlwp.
*/
void
cpu_switch_prepare(struct lwp *olwp, struct lwp *nlwp)
{
struct proc *p = nlwp->l_proc;
/* Check for Restartable Atomic Sequences. */
if (p->p_raslist != NULL) {
void *pc;
pc = ras_lookup(p, (void *)nlwp->l_md.md_regs->tf_spc);
if (pc != (void *) -1)
nlwp->l_md.md_regs->tf_spc = (int) pc;
}
}
/*
* When no processes are on the run queue, wait for something to come
* ready. Separate function for profiling.
*/
void
cpu_idle(void)
{
__asm volatile("sleep");
}
#ifndef P1_STACK
#ifdef SH3
/*
* Nothing to do for sh3.
*/
void
sh3_switch_setup(struct lwp *l)
{
return;
}
#endif /* SH3 */
#ifdef SH4
/*
* Prepare kernel stack PTE table. sh4_switch_resume wires these PTEs.
*/
void
sh4_switch_setup(struct lwp *l)
{
struct md_upte *md_upte;
uint32_t vpn;
pt_entry_t *pte;
int i, e;
md_upte = l->l_md.md_upte;
vpn = sh3_trunc_page(l->l_addr);
e = SH4_UTLB_ENTRY - UPAGES;
for (i = 0; i < UPAGES; ++i) {
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;
vpn += PAGE_SIZE;
++e;
}
}
#endif /* SH4 */
#endif /* !P1_STACK */
/*
* Copy a NUL-terminated string, at most maxlen characters long.
* Return the number of characters copied (including the NUL) in
* *lencopied. If the string is too long, return ENAMETOOLONG,
* else return 0.
*/
int
copystr(const void *kfaddr, void *kdaddr, size_t maxlen, size_t *lencopied)
{
const char *from = kfaddr;
char *to = kdaddr;
int i;
for (i = 0; i < maxlen; i++) {
if ((*to++ = *from++) == '\0') {
if (lencopied)
*lencopied = i + 1;
return (0);
}
}
if (lencopied)
*lencopied = i;
return (ENAMETOOLONG);
}