xref: /freebsd-10-stable/sys/powerpc/powerpc/vm_machdep.c

/*-
 * Copyright (c) 1982, 1986 The Regents of the University of California.
 * Copyright (c) 1989, 1990 William Jolitz
 * Copyright (c) 1994 John Dyson
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department, and 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.
 *
 *	from: @(#)vm_machdep.c	7.3 (Berkeley) 5/13/91
 *	Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
 * $FreeBSD: head/sys/powerpc/aim/vm_machdep.c 119563 2003-08-29 20:04:10Z alc $
 */
/*
 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include "opt_kstack_pages.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/vnode.h>
#include <sys/vmmeter.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>

#include <machine/clock.h>
#include <machine/cpu.h>
#include <machine/fpu.h>
#include <machine/frame.h>
#include <machine/md_var.h>

#include <dev/ofw/openfirm.h>

#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_map.h>
#include <vm/vm_extern.h>

#include <sys/user.h>

static void	sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)

/*
 * Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
 * sf_freelist head with the sf_lock mutex.
 */
static struct {
	SLIST_HEAD(, sf_buf) sf_head;
	struct mtx sf_lock;
} sf_freelist;

static u_int	sf_buf_alloc_want;

/*
 * Finish a fork operation, with process p2 nearly set up.
 * Copy and update the pcb, set up the stack so that the child
 * ready to run and return to user mode.
 */
void
cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
{
	struct	proc *p1;
	struct	trapframe *tf;
	struct	callframe *cf;
	struct	pcb *pcb;

	KASSERT(td1 == curthread || td1 == &thread0,
	    ("cpu_fork: p1 not curproc and not proc0"));
	CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags);

	if ((flags & RFPROC) == 0)
		return;

	p1 = td1->td_proc;

	pcb = (struct pcb *)((td2->td_kstack + KSTACK_PAGES * PAGE_SIZE -
	    sizeof(struct pcb)) & ~0x2fU);
	td2->td_pcb = pcb;

	/* Copy the pcb */
	bcopy(td1->td_pcb, pcb, sizeof(struct pcb));

	/*
	 * Create a fresh stack for the new process.
	 * Copy the trap frame for the return to user mode as if from a
	 * syscall.  This copies most of the user mode register values.
	 */
	tf = (struct trapframe *)pcb - 1;
	bcopy(td1->td_frame, tf, sizeof(*tf));

	/* Set up trap frame. */
	tf->fixreg[FIRSTARG] = 0;
	tf->fixreg[FIRSTARG + 1] = 0;
	tf->cr &= ~0x10000000;

	td2->td_frame = tf;

	cf = (struct callframe *)tf - 1;
	cf->cf_func = (register_t)fork_return;
	cf->cf_arg0 = (register_t)td2;
	cf->cf_arg1 = (register_t)tf;

	pcb->pcb_sp = (register_t)cf;
	pcb->pcb_lr = (register_t)fork_trampoline;
	pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR];

	/*
 	 * Now cpu_switch() can schedule the new process.
	 */
}

/*
 * Intercept the return address from a freshly forked process that has NOT
 * been scheduled yet.
 *
 * This is needed to make kernel threads stay in kernel mode.
 */
void
cpu_set_fork_handler(td, func, arg)
	struct thread *td;
	void (*func)(void *);
	void *arg;
{
	struct	callframe *cf;

	CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x",
	    (u_int)td, (u_int)func, (u_int)arg);

	cf = (struct callframe *)td->td_pcb->pcb_sp;

	cf->cf_func = (register_t)func;
	cf->cf_arg0 = (register_t)arg;
}

/*
 * cpu_exit is called as the last action during exit.
 * We release the address space of the process, block interrupts,
 * and call switch_exit.  switch_exit switches to proc0's PCB and stack,
 * then jumps into the middle of cpu_switch, as if it were switching
 * from proc0.
 */
void
cpu_exit(td)
	register struct thread *td;
{
}

void
cpu_sched_exit(td)
	register struct thread *td;
{
}

/* Temporary helper */
void
cpu_throw(struct thread *old, struct thread *new)
{

	cpu_switch(old, new);
	panic("cpu_throw() didn't");
}

/*
 * Reset back to firmware.
 */
void
cpu_reset()
{
	OF_exit();
}

/*
 * Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
 */
static void
sf_buf_init(void *arg)
{
	struct sf_buf *sf_bufs;
	vm_offset_t sf_base;
	int i;

	mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
	mtx_lock(&sf_freelist.sf_lock);
	SLIST_INIT(&sf_freelist.sf_head);
	sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
	sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
	    M_NOWAIT | M_ZERO);
	for (i = 0; i < nsfbufs; i++) {
		sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
		SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
	}
	sf_buf_alloc_want = 0;
	mtx_unlock(&sf_freelist.sf_lock);
}

/*
 * Get an sf_buf from the freelist. Will block if none are available.
 */
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
	struct sf_buf *sf;
	int error;

	mtx_lock(&sf_freelist.sf_lock);
	while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
		sf_buf_alloc_want++;
		error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
		    "sfbufa", 0);
		sf_buf_alloc_want--;

		/*
		 * If we got a signal, don't risk going back to sleep.
		 */
		if (error)
			break;
	}
	if (sf != NULL) {
		SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
		sf->m = m;
		pmap_qenter(sf->kva, &sf->m, 1);
	}
	mtx_unlock(&sf_freelist.sf_lock);
	return (sf);
}

/*
 * Detatch mapped page and release resources back to the system.
 */
void
sf_buf_free(void *addr, void *args)
{
	struct sf_buf *sf;
	struct vm_page *m;

	sf = args;
	pmap_qremove((vm_offset_t)addr, 1);
	m = sf->m;
	vm_page_lock_queues();
	vm_page_unwire(m, 0);
	/*
	 * Check for the object going away on us. This can
	 * happen since we don't hold a reference to it.
	 * If so, we're responsible for freeing the page.
	 */
	if (m->wire_count == 0 && m->object == NULL)
		vm_page_free(m);
	vm_page_unlock_queues();
	sf->m = NULL;
	mtx_lock(&sf_freelist.sf_lock);
	SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
	if (sf_buf_alloc_want > 0)
		wakeup_one(&sf_freelist);
	mtx_unlock(&sf_freelist.sf_lock);
}

/*
 * Software interrupt handler for queued VM system processing.
 */
void
swi_vm(void *dummy)
{
#if 0 /* XXX: Don't have busdma stuff yet */
	if (busdma_swi_pending != 0)
		busdma_swi();
#endif
}

/*
 * Tell whether this address is in some physical memory region.
 * Currently used by the kernel coredump code in order to avoid
 * dumping the ``ISA memory hole'' which could cause indefinite hangs,
 * or other unpredictable behaviour.
 */


int
is_physical_memory(addr)
	vm_offset_t addr;
{
	/*
	 * stuff other tests for known memory-mapped devices (PCI?)
	 * here
	 */

	return 1;
}

/*
 * KSE functions
 */
void
cpu_thread_exit(struct thread *td)
{
}

void
cpu_thread_clean(struct thread *td)
{
}

void
cpu_thread_setup(struct thread *td)
{
}

void
cpu_thread_swapin(struct thread *td)
{
}

void
cpu_thread_swapout(struct thread *td)
{
}

void
cpu_set_upcall(struct thread *td, struct thread *td0)
{
}

void
cpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku)
{
}