2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/vm/vm_vmspace.c,v 1.14 2007/08/15 03:15:07 dillon Exp $
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/systm.h>
40 #include <sys/sysproto.h>
41 #include <sys/kern_syscall.h>
44 #include <sys/malloc.h>
45 #include <sys/sysctl.h>
46 #include <sys/vkernel.h>
47 #include <sys/vmspace.h>
49 #include <vm/vm_extern.h>
52 #include <machine/vmparam.h>
54 #include <sys/spinlock2.h>
55 #include <sys/sysref2.h>
56 #include <sys/mplock2.h>
58 static struct vmspace_entry *vkernel_find_vmspace(struct vkernel_proc *vkp,
60 static void vmspace_entry_delete(struct vmspace_entry *ve,
61 struct vkernel_proc *vkp);
63 static MALLOC_DEFINE(M_VKERNEL, "vkernel", "VKernel structures");
66 * vmspace_create (void *id, int type, void *data)
68 * Create a VMSPACE under the control of the caller with the specified id.
69 * An id of NULL cannot be used. The type and data fields must currently
72 * The vmspace starts out completely empty. Memory may be mapped into the
73 * VMSPACE with vmspace_mmap() and MAP_VPAGETABLE section(s) controlled
74 * with vmspace_mcontrol().
79 sys_vmspace_create(struct vmspace_create_args *uap)
81 struct vmspace_entry *ve;
82 struct vkernel_proc *vkp;
85 if (vkernel_enable == 0)
89 * Create a virtual kernel side-structure for the process if one
93 if ((vkp = curproc->p_vkernel) == NULL) {
94 vkp = kmalloc(sizeof(*vkp), M_VKERNEL, M_WAITOK|M_ZERO);
96 spin_init(&vkp->spin);
98 curproc->p_vkernel = vkp;
102 * Create a new VMSPACE
104 * XXX race if kmalloc blocks
106 if (vkernel_find_vmspace(vkp, uap->id)) {
110 ve = kmalloc(sizeof(struct vmspace_entry), M_VKERNEL, M_WAITOK|M_ZERO);
111 ve->vmspace = vmspace_alloc(VM_MIN_USER_ADDRESS, VM_MAX_USER_ADDRESS);
113 pmap_pinit2(vmspace_pmap(ve->vmspace));
114 RB_INSERT(vmspace_rb_tree, &vkp->root, ve);
122 * vmspace_destroy (void *id)
129 sys_vmspace_destroy(struct vmspace_destroy_args *uap)
131 struct vkernel_proc *vkp;
132 struct vmspace_entry *ve;
136 if ((vkp = curproc->p_vkernel) == NULL) {
140 if ((ve = vkernel_find_vmspace(vkp, uap->id)) == NULL) {
148 vmspace_entry_delete(ve, vkp);
156 * vmspace_ctl (void *id, int cmd, struct trapframe *tframe,
157 * struct vextframe *vframe);
159 * Transfer control to a VMSPACE. Control is returned after the specified
160 * number of microseconds or if a page fault, signal, trap, or system call
161 * occurs. The context is updated as appropriate.
166 sys_vmspace_ctl(struct vmspace_ctl_args *uap)
168 struct vkernel_proc *vkp;
169 struct vkernel_lwp *vklp;
170 struct vmspace_entry *ve;
176 lp = curthread->td_lwp;
180 if ((vkp = p->p_vkernel) == NULL) {
184 if ((ve = vkernel_find_vmspace(vkp, uap->id)) == NULL) {
190 * Signal mailbox interlock
192 if (p->p_flag & P_MAILBOX) {
193 p->p_flag &= ~P_MAILBOX;
199 case VMSPACE_CTL_RUN:
201 * Save the caller's register context, swap VM spaces, and
202 * install the passed register context. Return with
203 * EJUSTRETURN so the syscall code doesn't adjust the context.
205 atomic_add_int(&ve->refs, 1);
206 framesz = sizeof(struct trapframe);
207 if ((vklp = lp->lwp_vkernel) == NULL) {
208 vklp = kmalloc(sizeof(*vklp), M_VKERNEL,
210 lp->lwp_vkernel = vklp;
212 vklp->user_trapframe = uap->tframe;
213 vklp->user_vextframe = uap->vframe;
214 bcopy(uap->sysmsg_frame, &vklp->save_trapframe, framesz);
215 bcopy(&curthread->td_tls, &vklp->save_vextframe.vx_tls,
216 sizeof(vklp->save_vextframe.vx_tls));
217 error = copyin(uap->tframe, uap->sysmsg_frame, framesz);
219 error = copyin(&uap->vframe->vx_tls, &curthread->td_tls, sizeof(struct savetls));
221 error = cpu_sanitize_frame(uap->sysmsg_frame);
223 error = cpu_sanitize_tls(&curthread->td_tls);
225 bcopy(&vklp->save_trapframe, uap->sysmsg_frame, framesz);
226 bcopy(&vklp->save_vextframe.vx_tls, &curthread->td_tls,
227 sizeof(vklp->save_vextframe.vx_tls));
229 atomic_subtract_int(&ve->refs, 1);
232 pmap_setlwpvm(lp, ve->vmspace);
234 set_vkernel_fp(uap->sysmsg_frame);
248 * vmspace_mmap(id, addr, len, prot, flags, fd, offset)
250 * map memory within a VMSPACE. This function is just like a normal mmap()
251 * but operates on the vmspace's memory map. Most callers use this to create
252 * a MAP_VPAGETABLE mapping.
257 sys_vmspace_mmap(struct vmspace_mmap_args *uap)
259 struct vkernel_proc *vkp;
260 struct vmspace_entry *ve;
264 if ((vkp = curproc->p_vkernel) == NULL) {
268 if ((ve = vkernel_find_vmspace(vkp, uap->id)) == NULL) {
272 error = kern_mmap(ve->vmspace, uap->addr, uap->len,
273 uap->prot, uap->flags,
274 uap->fd, uap->offset, &uap->sysmsg_resultp);
281 * vmspace_munmap(id, addr, len)
283 * unmap memory within a VMSPACE.
288 sys_vmspace_munmap(struct vmspace_munmap_args *uap)
290 struct vkernel_proc *vkp;
291 struct vmspace_entry *ve;
294 vm_size_t size, pageoff;
299 if ((vkp = curproc->p_vkernel) == NULL) {
303 if ((ve = vkernel_find_vmspace(vkp, uap->id)) == NULL) {
309 * Copied from sys_munmap()
311 addr = (vm_offset_t)uap->addr;
314 pageoff = (addr & PAGE_MASK);
317 size = (vm_size_t)round_page(size);
318 if (size < uap->len) { /* wrap */
322 tmpaddr = addr + size; /* workaround gcc4 opt */
323 if (tmpaddr < addr) { /* wrap */
332 if (VM_MAX_USER_ADDRESS > 0 && tmpaddr > VM_MAX_USER_ADDRESS) {
336 if (VM_MIN_USER_ADDRESS > 0 && addr < VM_MIN_USER_ADDRESS) {
340 map = &ve->vmspace->vm_map;
341 if (!vm_map_check_protection(map, addr, tmpaddr, VM_PROT_NONE)) {
345 vm_map_remove(map, addr, addr + size);
353 * vmspace_pread(id, buf, nbyte, flags, offset)
355 * Read data from a vmspace. The number of bytes read is returned or
356 * -1 if an unrecoverable error occured. If the number of bytes read is
357 * less then the request size, a page fault occured in the VMSPACE which
358 * the caller must resolve in order to proceed.
360 * (not implemented yet)
365 sys_vmspace_pread(struct vmspace_pread_args *uap)
367 struct vkernel_proc *vkp;
368 struct vmspace_entry *ve;
372 if ((vkp = curproc->p_vkernel) == NULL) {
376 if ((ve = vkernel_find_vmspace(vkp, uap->id)) == NULL) {
387 * vmspace_pwrite(id, buf, nbyte, flags, offset)
389 * Write data to a vmspace. The number of bytes written is returned or
390 * -1 if an unrecoverable error occured. If the number of bytes written is
391 * less then the request size, a page fault occured in the VMSPACE which
392 * the caller must resolve in order to proceed.
394 * (not implemented yet)
399 sys_vmspace_pwrite(struct vmspace_pwrite_args *uap)
401 struct vkernel_proc *vkp;
402 struct vmspace_entry *ve;
406 if ((vkp = curproc->p_vkernel) == NULL) {
410 if ((ve = vkernel_find_vmspace(vkp, uap->id)) == NULL) {
421 * vmspace_mcontrol(id, addr, len, behav, value)
423 * madvise/mcontrol support for a vmspace.
428 sys_vmspace_mcontrol(struct vmspace_mcontrol_args *uap)
430 struct vkernel_proc *vkp;
431 struct vmspace_entry *ve;
432 vm_offset_t start, end;
433 vm_offset_t tmpaddr = (vm_offset_t)uap->addr + uap->len;
437 if ((vkp = curproc->p_vkernel) == NULL) {
441 if ((ve = vkernel_find_vmspace(vkp, uap->id)) == NULL) {
447 * This code is basically copied from sys_mcontrol()
449 if (uap->behav < 0 || uap->behav > MADV_CONTROL_END) {
454 if (tmpaddr < (vm_offset_t)uap->addr) {
458 if (VM_MAX_USER_ADDRESS > 0 && tmpaddr > VM_MAX_USER_ADDRESS) {
462 if (VM_MIN_USER_ADDRESS > 0 && uap->addr < VM_MIN_USER_ADDRESS) {
467 start = trunc_page((vm_offset_t) uap->addr);
468 end = round_page(tmpaddr);
470 error = vm_map_madvise(&ve->vmspace->vm_map, start, end,
471 uap->behav, uap->value);
478 * Red black tree functions
480 static int rb_vmspace_compare(struct vmspace_entry *, struct vmspace_entry *);
481 RB_GENERATE(vmspace_rb_tree, vmspace_entry, rb_entry, rb_vmspace_compare);
483 /* a->start is address, and the only field has to be initialized */
485 rb_vmspace_compare(struct vmspace_entry *a, struct vmspace_entry *b)
487 if ((char *)a->id < (char *)b->id)
489 else if ((char *)a->id > (char *)b->id)
496 rb_vmspace_delete(struct vmspace_entry *ve, void *data)
498 struct vkernel_proc *vkp = data;
500 KKASSERT(ve->refs == 0);
501 vmspace_entry_delete(ve, vkp);
506 * Remove a vmspace_entry from the RB tree and destroy it. We have to clean
507 * up the pmap, the vm_map, then destroy the vmspace.
511 vmspace_entry_delete(struct vmspace_entry *ve, struct vkernel_proc *vkp)
513 RB_REMOVE(vmspace_rb_tree, &vkp->root, ve);
515 pmap_remove_pages(vmspace_pmap(ve->vmspace),
516 VM_MIN_USER_ADDRESS, VM_MAX_USER_ADDRESS);
517 vm_map_remove(&ve->vmspace->vm_map,
518 VM_MIN_USER_ADDRESS, VM_MAX_USER_ADDRESS);
519 sysref_put(&ve->vmspace->vm_sysref);
520 kfree(ve, M_VKERNEL);
525 struct vmspace_entry *
526 vkernel_find_vmspace(struct vkernel_proc *vkp, void *id)
528 struct vmspace_entry *ve;
529 struct vmspace_entry key;
532 ve = RB_FIND(vmspace_rb_tree, &vkp->root, &key);
537 * Manage vkernel refs, used by the kernel when fork()ing or exit()ing
541 vkernel_inherit(struct proc *p1, struct proc *p2)
543 struct vkernel_proc *vkp;
546 KKASSERT(vkp->refs > 0);
547 atomic_add_int(&vkp->refs, 1);
552 vkernel_exit(struct proc *p)
554 struct vkernel_proc *vkp;
560 * Restore the original VM context if we are killed while running
563 * This isn't supposed to happen. What is supposed to happen is
564 * that the process should enter vkernel_trap() before the handling
567 RB_FOREACH(lp, lwp_rb_tree, &p->p_lwp_tree) {
568 vkernel_lwp_exit(lp);
572 * Dereference the common area
575 KKASSERT(vkp->refs > 0);
576 spin_lock_wr(&vkp->spin);
577 if (--vkp->refs == 0)
579 spin_unlock_wr(&vkp->spin);
582 RB_SCAN(vmspace_rb_tree, &vkp->root, NULL,
583 rb_vmspace_delete, vkp);
584 kfree(vkp, M_VKERNEL);
589 vkernel_lwp_exit(struct lwp *lp)
591 struct vkernel_lwp *vklp;
592 struct vmspace_entry *ve;
594 if ((vklp = lp->lwp_vkernel) != NULL) {
595 if ((ve = vklp->ve) != NULL) {
596 kprintf("Warning, pid %d killed with "
597 "active VC!\n", lp->lwp_proc->p_pid);
599 pmap_setlwpvm(lp, lp->lwp_proc->p_vmspace);
601 KKASSERT(ve->refs > 0);
602 atomic_subtract_int(&ve->refs, 1);
604 lp->lwp_vkernel = NULL;
605 kfree(vklp, M_VKERNEL);
610 * A VM space under virtual kernel control trapped out or made a system call
611 * or otherwise needs to return control to the virtual kernel context.
614 vkernel_trap(struct lwp *lp, struct trapframe *frame)
616 struct proc *p = lp->lwp_proc;
617 struct vmspace_entry *ve;
618 struct vkernel_lwp *vklp;
622 * Which vmspace entry was running?
624 vklp = lp->lwp_vkernel;
627 KKASSERT(ve != NULL);
630 * Switch the LWP vmspace back to the virtual kernel's VM space.
633 pmap_setlwpvm(lp, p->p_vmspace);
634 KKASSERT(ve->refs > 0);
635 atomic_subtract_int(&ve->refs, 1);
638 * Copy the emulated process frame to the virtual kernel process.
639 * The emulated process cannot change TLS descriptors so don't
640 * bother saving them, we already have a copy.
642 * Restore the virtual kernel's saved context so the virtual kernel
643 * process can resume.
645 error = copyout(frame, vklp->user_trapframe, sizeof(*frame));
646 bcopy(&vklp->save_trapframe, frame, sizeof(*frame));
647 bcopy(&vklp->save_vextframe.vx_tls, &curthread->td_tls,
648 sizeof(vklp->save_vextframe.vx_tls));
650 cpu_vkernel_trap(frame, error);