344 lines
8.9 KiB
C
344 lines
8.9 KiB
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 $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
|
|
* $FreeBSD$
|
|
*/
|
|
/*
|
|
* 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 <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/sysctl.h>
|
|
#include <sys/unistd.h>
|
|
|
|
#include <machine/clock.h>
|
|
#include <machine/cpu.h>
|
|
#include <machine/fpu.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>
|
|
|
|
/*
|
|
* quick version of vm_fault
|
|
*/
|
|
int
|
|
vm_fault_quick(v, prot)
|
|
caddr_t v;
|
|
int prot;
|
|
{
|
|
int r;
|
|
if (prot & VM_PROT_WRITE)
|
|
r = subyte(v, fubyte(v));
|
|
else
|
|
r = fubyte(v);
|
|
return(r);
|
|
}
|
|
|
|
/*
|
|
* 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));
|
|
|
|
/* XXX: Set up trap frame? */
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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_wait(td)
|
|
struct proc *td;
|
|
{
|
|
}
|
|
|
|
/* Temporary helper */
|
|
void
|
|
cpu_throw(void)
|
|
{
|
|
|
|
cpu_switch();
|
|
panic("cpu_throw() didn't");
|
|
}
|
|
|
|
/*
|
|
* Dump the machine specific header information at the start of a core dump.
|
|
*/
|
|
int
|
|
cpu_coredump(td, vp, cred)
|
|
struct thread *td;
|
|
struct vnode *vp;
|
|
struct ucred *cred;
|
|
{
|
|
|
|
return (vn_rdwr(UIO_WRITE, vp, (caddr_t)td->td_proc->p_uarea,
|
|
ctob(UAREA_PAGES), (off_t)0, UIO_SYSSPACE, IO_UNIT, cred,
|
|
(int *)NULL, td));
|
|
}
|
|
|
|
/*
|
|
* Map an IO request into kernel virtual address space.
|
|
*
|
|
* All requests are (re)mapped into kernel VA space.
|
|
* Notice that we use b_bufsize for the size of the buffer
|
|
* to be mapped. b_bcount might be modified by the driver.
|
|
*/
|
|
void
|
|
vmapbuf(bp)
|
|
register struct buf *bp;
|
|
{
|
|
register caddr_t addr, v, kva;
|
|
vm_offset_t pa;
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
if ((bp->b_flags & B_PHYS) == 0)
|
|
panic("vmapbuf");
|
|
|
|
for (v = bp->b_saveaddr, addr = (caddr_t)trunc_page(bp->b_data);
|
|
addr < bp->b_data + bp->b_bufsize;
|
|
addr += PAGE_SIZE, v += PAGE_SIZE) {
|
|
/*
|
|
* Do the vm_fault if needed; do the copy-on-write thing
|
|
* when reading stuff off device into memory.
|
|
*/
|
|
vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
|
|
(bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
|
|
pa = trunc_page(pmap_kextract((vm_offset_t) addr));
|
|
if (pa == 0)
|
|
panic("vmapbuf: page not present");
|
|
vm_page_hold(PHYS_TO_VM_PAGE(pa));
|
|
pmap_kenter((vm_offset_t) v, pa);
|
|
}
|
|
|
|
kva = bp->b_saveaddr;
|
|
bp->b_saveaddr = bp->b_data;
|
|
bp->b_data = kva + (((vm_offset_t) bp->b_data) & PAGE_MASK);
|
|
}
|
|
|
|
/*
|
|
* Free the io map PTEs associated with this IO operation.
|
|
* We also invalidate the TLB entries and restore the original b_addr.
|
|
*/
|
|
void
|
|
vunmapbuf(bp)
|
|
register struct buf *bp;
|
|
{
|
|
register caddr_t addr;
|
|
vm_offset_t pa;
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
if ((bp->b_flags & B_PHYS) == 0)
|
|
panic("vunmapbuf");
|
|
|
|
for (addr = (caddr_t)trunc_page(bp->b_data);
|
|
addr < bp->b_data + bp->b_bufsize;
|
|
addr += PAGE_SIZE) {
|
|
pa = trunc_page(pmap_kextract((vm_offset_t) addr));
|
|
pmap_kremove((vm_offset_t) addr);
|
|
vm_page_unhold(PHYS_TO_VM_PAGE(pa));
|
|
}
|
|
|
|
bp->b_data = bp->b_saveaddr;
|
|
}
|
|
|
|
/*
|
|
* Reset back to firmware.
|
|
*/
|
|
void
|
|
cpu_reset()
|
|
{
|
|
OF_exit();
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|