2 * Copyright (c) 1982, 1986 The Regents of the University of California.
3 * Copyright (c) 1989, 1990 William Jolitz
4 * Copyright (c) 1994 John Dyson
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department, and William Jolitz.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
40 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
44 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
45 * All rights reserved.
47 * Author: Chris G. Demetriou
49 * Permission to use, copy, modify and distribute this software and
50 * its documentation is hereby granted, provided that both the copyright
51 * notice and this permission notice appear in all copies of the
52 * software, derivative works or modified versions, and any portions
53 * thereof, and that both notices appear in supporting documentation.
55 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
56 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
57 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
59 * Carnegie Mellon requests users of this software to return to
61 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
62 * School of Computer Science
63 * Carnegie Mellon University
64 * Pittsburgh PA 15213-3890
66 * any improvements or extensions that they make and grant Carnegie the
67 * rights to redistribute these changes.
70 #include <sys/param.h>
71 #include <sys/systm.h>
73 #include <sys/malloc.h>
78 #include <sys/mutex.h>
79 #include <sys/vnode.h>
80 #include <sys/vmmeter.h>
81 #include <sys/kernel.h>
82 #include <sys/sysctl.h>
83 #include <sys/unistd.h>
85 #include <machine/clock.h>
86 #include <machine/cpu.h>
87 #include <machine/fpu.h>
88 #include <machine/frame.h>
89 #include <machine/md_var.h>
91 #include <dev/ofw/openfirm.h>
94 #include <vm/vm_param.h>
95 #include <vm/vm_kern.h>
96 #include <vm/vm_page.h>
97 #include <vm/vm_map.h>
98 #include <vm/vm_extern.h>
100 #include <sys/user.h>
103 * quick version of vm_fault
106 vm_fault_quick(v, prot)
111 if (prot & VM_PROT_WRITE)
112 r = subyte(v, fubyte(v));
119 * Finish a fork operation, with process p2 nearly set up.
120 * Copy and update the pcb, set up the stack so that the child
121 * ready to run and return to user mode.
124 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
127 struct trapframe *tf;
128 struct callframe *cf;
131 KASSERT(td1 == curthread || td1 == &thread0,
132 ("cpu_fork: p1 not curproc and not proc0"));
133 CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags);
135 if ((flags & RFPROC) == 0)
140 pcb = (struct pcb *)((td2->td_kstack + KSTACK_PAGES * PAGE_SIZE -
141 sizeof(struct pcb)) & ~0x2fU);
145 bcopy(td1->td_pcb, pcb, sizeof(struct pcb));
148 * Create a fresh stack for the new process.
149 * Copy the trap frame for the return to user mode as if from a
150 * syscall. This copies most of the user mode register values.
152 tf = (struct trapframe *)pcb - 1;
153 bcopy(td1->td_frame, tf, sizeof(*tf));
155 /* Set up trap frame. */
156 tf->fixreg[FIRSTARG] = 0;
157 tf->fixreg[FIRSTARG + 1] = 0;
158 tf->cr &= ~0x10000000;
162 cf = (struct callframe *)tf - 1;
163 cf->cf_func = (register_t)fork_return;
164 cf->cf_arg0 = (register_t)td2;
165 cf->cf_arg1 = (register_t)tf;
167 pcb->pcb_sp = (register_t)cf;
168 pcb->pcb_lr = (register_t)fork_trampoline;
171 * Now cpu_switch() can schedule the new process.
176 * Intercept the return address from a freshly forked process that has NOT
177 * been scheduled yet.
179 * This is needed to make kernel threads stay in kernel mode.
182 cpu_set_fork_handler(td, func, arg)
184 void (*func)(void *);
187 struct callframe *cf;
189 CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x",
190 (u_int)td, (u_int)func, (u_int)arg);
192 cf = (struct callframe *)td->td_pcb->pcb_sp;
194 cf->cf_func = (register_t)func;
195 cf->cf_arg0 = (register_t)arg;
199 * cpu_exit is called as the last action during exit.
200 * We release the address space of the process, block interrupts,
201 * and call switch_exit. switch_exit switches to proc0's PCB and stack,
202 * then jumps into the middle of cpu_switch, as if it were switching
207 register struct thread *td;
213 register struct thread *td;
223 /* Temporary helper */
229 panic("cpu_throw() didn't");
233 * Map an IO request into kernel virtual address space.
235 * All requests are (re)mapped into kernel VA space.
236 * Notice that we use b_bufsize for the size of the buffer
237 * to be mapped. b_bcount might be modified by the driver.
241 register struct buf *bp;
243 register caddr_t addr, v, kva;
248 if ((bp->b_flags & B_PHYS) == 0)
251 for (v = bp->b_saveaddr, addr = (caddr_t)trunc_page(bp->b_data);
252 addr < bp->b_data + bp->b_bufsize;
253 addr += PAGE_SIZE, v += PAGE_SIZE) {
255 * Do the vm_fault if needed; do the copy-on-write thing
256 * when reading stuff off device into memory.
258 vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
259 (bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
260 pa = trunc_page(pmap_kextract((vm_offset_t) addr));
262 panic("vmapbuf: page not present");
263 vm_page_hold(PHYS_TO_VM_PAGE(pa));
264 pmap_kenter((vm_offset_t) v, pa);
267 kva = bp->b_saveaddr;
268 bp->b_saveaddr = bp->b_data;
269 bp->b_data = kva + (((vm_offset_t) bp->b_data) & PAGE_MASK);
273 * Free the io map PTEs associated with this IO operation.
274 * We also invalidate the TLB entries and restore the original b_addr.
278 register struct buf *bp;
280 register caddr_t addr;
285 if ((bp->b_flags & B_PHYS) == 0)
288 for (addr = (caddr_t)trunc_page(bp->b_data);
289 addr < bp->b_data + bp->b_bufsize;
291 pa = trunc_page(pmap_kextract((vm_offset_t) addr));
292 pmap_kremove((vm_offset_t) addr);
293 vm_page_unhold(PHYS_TO_VM_PAGE(pa));
296 bp->b_data = bp->b_saveaddr;
300 * Reset back to firmware.
309 * Software interrupt handler for queued VM system processing.
314 #if 0 /* XXX: Don't have busdma stuff yet */
315 if (busdma_swi_pending != 0)
321 * Tell whether this address is in some physical memory region.
322 * Currently used by the kernel coredump code in order to avoid
323 * dumping the ``ISA memory hole'' which could cause indefinite hangs,
324 * or other unpredictable behaviour.
329 is_physical_memory(addr)
333 * stuff other tests for known memory-mapped devices (PCI?)
344 cpu_thread_exit(struct thread *td)
351 cpu_thread_setup(struct thread *td)
358 cpu_save_upcall(struct thread *td, struct kse *newkse)
365 cpu_set_upcall(struct thread *td, void *pcb)
372 cpu_set_args(struct thread *td, struct kse *ke)
379 cpu_free_kse_mdstorage(struct kse *ke)
386 cpu_export_context(struct thread *td)