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 1.8 2007/01/08 03:33:43 dillon Exp $
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/sysproto.h>
42 #include <sys/kern_syscall.h>
45 #include <sys/malloc.h>
46 #include <sys/sysctl.h>
47 #include <sys/vkernel.h>
48 #include <sys/vmspace.h>
49 #include <sys/spinlock2.h>
51 #include <vm/vm_extern.h>
55 #include <machine/vmparam.h>
57 static struct vmspace_entry *vkernel_find_vmspace(struct vkernel_common *vc,
59 static void vmspace_entry_delete(struct vmspace_entry *ve,
60 struct vkernel_common *vc);
62 static MALLOC_DEFINE(M_VKERNEL, "vkernel", "VKernel structures");
65 * vmspace_create (void *id, int type, void *data)
67 * Create a VMSPACE under the control of the caller with the specified id.
68 * An id of NULL cannot be used. The type and data fields must currently
71 * The vmspace starts out completely empty. Memory may be mapped into the
72 * VMSPACE with vmspace_mmap() and MAP_VPAGETABLE section(s) controlled
73 * with vmspace_mcontrol().
76 sys_vmspace_create(struct vmspace_create_args *uap)
78 struct vkernel_common *vc;
79 struct vmspace_entry *ve;
82 if (vkernel_enable == 0)
86 * Create a virtual kernel side-structure for the process if one
89 if ((vk = curproc->p_vkernel) == NULL) {
90 vk = kmalloc(sizeof(*vk), M_VKERNEL, M_WAITOK|M_ZERO);
91 vc = kmalloc(sizeof(*vc), M_VKERNEL, M_WAITOK|M_ZERO);
93 spin_init(&vc->vc_spin);
94 RB_INIT(&vc->vc_root);
96 curproc->p_vkernel = vk;
101 * Create a new VMSPACE
103 if (vkernel_find_vmspace(vc, uap->id))
105 ve = kmalloc(sizeof(struct vmspace_entry), M_VKERNEL, M_WAITOK|M_ZERO);
106 ve->vmspace = vmspace_alloc(VM_MIN_USER_ADDRESS, VM_MAX_USER_ADDRESS);
108 pmap_pinit2(vmspace_pmap(ve->vmspace));
109 RB_INSERT(vmspace_rb_tree, &vc->vc_root, ve);
114 * vmspace_destroy (void *id)
119 sys_vmspace_destroy(struct vmspace_destroy_args *uap)
121 struct vkernel_common *vc;
122 struct vmspace_entry *ve;
125 if ((vk = curproc->p_vkernel) == NULL)
128 if ((ve = vkernel_find_vmspace(vc, uap->id)) == NULL)
132 vmspace_entry_delete(ve, vc);
137 * vmspace_ctl (void *id, int cmd, struct trapframe *tframe,
138 * struct vextframe *vframe);
140 * Transfer control to a VMSPACE. Control is returned after the specified
141 * number of microseconds or if a page fault, signal, trap, or system call
142 * occurs. The context is updated as appropriate.
145 sys_vmspace_ctl(struct vmspace_ctl_args *uap)
147 struct vkernel_common *vc;
148 struct vmspace_entry *ve;
154 if ((vk = curproc->p_vkernel) == NULL)
157 if ((ve = vkernel_find_vmspace(vc, uap->id)) == NULL)
161 case VMSPACE_CTL_RUN:
163 * Save the caller's register context, swap VM spaces, and
164 * install the passed register context. Return with
165 * EJUSTRETURN so the syscall code doesn't adjust the context.
169 framesz = sizeof(struct trapframe);
171 vk->vk_save_vmspace = p->p_vmspace;
172 vk->vk_user_trapframe = uap->tframe;
173 vk->vk_user_vextframe = uap->vframe;
174 bcopy(uap->sysmsg_frame, &vk->vk_save_trapframe, framesz);
175 bcopy(&curthread->td_tls, &vk->vk_save_vextframe.vx_tls,
176 sizeof(vk->vk_save_vextframe.vx_tls));
177 error = copyin(uap->tframe, uap->sysmsg_frame, framesz);
179 error = copyin(&uap->vframe->vx_tls, &curthread->td_tls, sizeof(struct savetls));
181 error = cpu_sanitize_frame(uap->sysmsg_frame);
183 error = cpu_sanitize_tls(&curthread->td_tls);
185 bcopy(&vk->vk_save_trapframe, uap->sysmsg_frame, framesz);
186 bcopy(&vk->vk_save_vextframe.vx_tls, &curthread->td_tls,
187 sizeof(vk->vk_save_vextframe.vx_tls));
189 vk->vk_current = NULL;
190 vk->vk_save_vmspace = NULL;
194 p->p_vmspace = ve->vmspace;
208 * vmspace_mmap(id, addr, len, prot, flags, fd, offset)
210 * map memory within a VMSPACE. This function is just like a normal mmap()
211 * but operates on the vmspace's memory map. Most callers use this to create
212 * a MAP_VPAGETABLE mapping.
215 sys_vmspace_mmap(struct vmspace_mmap_args *uap)
217 struct vkernel_common *vc;
218 struct vmspace_entry *ve;
222 if ((vk = curproc->p_vkernel) == NULL)
225 if ((ve = vkernel_find_vmspace(vc, uap->id)) == NULL)
227 error = kern_mmap(ve->vmspace, uap->addr, uap->len,
228 uap->prot, uap->flags,
229 uap->fd, uap->offset, &uap->sysmsg_resultp);
234 * vmspace_munmap(id, addr, len)
236 * unmap memory within a VMSPACE.
239 sys_vmspace_munmap(struct vmspace_munmap_args *uap)
241 struct vkernel_common *vc;
242 struct vmspace_entry *ve;
245 vm_size_t size, pageoff;
248 if ((vk = curproc->p_vkernel) == NULL)
251 if ((ve = vkernel_find_vmspace(vc, uap->id)) == NULL)
255 * Copied from sys_munmap()
257 addr = (vm_offset_t)uap->addr;
260 pageoff = (addr & PAGE_MASK);
263 size = (vm_size_t)round_page(size);
264 if (addr + size < addr)
269 if (VM_MAX_USER_ADDRESS > 0 && addr + size > VM_MAX_USER_ADDRESS)
271 if (VM_MIN_USER_ADDRESS > 0 && addr < VM_MIN_USER_ADDRESS)
273 map = &ve->vmspace->vm_map;
274 if (!vm_map_check_protection(map, addr, addr + size, VM_PROT_NONE))
276 vm_map_remove(map, addr, addr + size);
281 * vmspace_pread(id, buf, nbyte, flags, offset)
283 * Read data from a vmspace. The number of bytes read is returned or
284 * -1 if an unrecoverable error occured. If the number of bytes read is
285 * less then the request size, a page fault occured in the VMSPACE which
286 * the caller must resolve in order to proceed.
289 sys_vmspace_pread(struct vmspace_pread_args *uap)
291 struct vkernel_common *vc;
292 struct vmspace_entry *ve;
295 if ((vk = curproc->p_vkernel) == NULL)
298 if ((ve = vkernel_find_vmspace(vc, uap->id)) == NULL)
304 * vmspace_pwrite(id, buf, nbyte, flags, offset)
306 * Write data to a vmspace. The number of bytes written is returned or
307 * -1 if an unrecoverable error occured. If the number of bytes written is
308 * less then the request size, a page fault occured in the VMSPACE which
309 * the caller must resolve in order to proceed.
312 sys_vmspace_pwrite(struct vmspace_pwrite_args *uap)
314 struct vkernel_common *vc;
315 struct vmspace_entry *ve;
318 if ((vk = curproc->p_vkernel) == NULL)
321 if ((ve = vkernel_find_vmspace(vc, uap->id)) == NULL)
327 * vmspace_mcontrol(id, addr, len, behav, value)
329 * madvise/mcontrol support for a vmspace.
332 sys_vmspace_mcontrol(struct vmspace_mcontrol_args *uap)
334 struct vkernel_common *vc;
335 struct vmspace_entry *ve;
337 vm_offset_t start, end;
339 if ((vk = curproc->p_vkernel) == NULL)
342 if ((ve = vkernel_find_vmspace(vc, uap->id)) == NULL)
346 * This code is basically copied from sys_mcontrol()
348 if (uap->behav < 0 || uap->behav > MADV_CONTROL_END)
351 if (VM_MAX_USER_ADDRESS > 0 &&
352 ((vm_offset_t) uap->addr + uap->len) > VM_MAX_USER_ADDRESS)
354 if (VM_MIN_USER_ADDRESS > 0 && uap->addr < VM_MIN_USER_ADDRESS)
356 if (((vm_offset_t) uap->addr + uap->len) < (vm_offset_t) uap->addr)
359 start = trunc_page((vm_offset_t) uap->addr);
360 end = round_page((vm_offset_t) uap->addr + uap->len);
362 return (vm_map_madvise(&ve->vmspace->vm_map, start, end,
363 uap->behav, uap->value));
367 * Red black tree functions
369 static int rb_vmspace_compare(struct vmspace_entry *, struct vmspace_entry *);
370 RB_GENERATE(vmspace_rb_tree, vmspace_entry, rb_entry, rb_vmspace_compare);
372 /* a->start is address, and the only field has to be initialized */
374 rb_vmspace_compare(struct vmspace_entry *a, struct vmspace_entry *b)
376 if ((char *)a->id < (char *)b->id)
378 else if ((char *)a->id > (char *)b->id)
385 rb_vmspace_delete(struct vmspace_entry *ve, void *data)
387 struct vkernel_common *vc = data;
389 KKASSERT(ve->refs == 0);
390 vmspace_entry_delete(ve, vc);
395 * Remove a vmspace_entry from the RB tree and destroy it. We have to clean
396 * up the pmap, the vm_map, then destroy the vmspace.
400 vmspace_entry_delete(struct vmspace_entry *ve, struct vkernel_common *vc)
402 RB_REMOVE(vmspace_rb_tree, &vc->vc_root, ve);
404 pmap_remove_pages(vmspace_pmap(ve->vmspace),
405 VM_MIN_USER_ADDRESS, VM_MAX_USER_ADDRESS);
406 vm_map_remove(&ve->vmspace->vm_map,
407 VM_MIN_USER_ADDRESS, VM_MAX_USER_ADDRESS);
408 vmspace_free(ve->vmspace);
409 kfree(ve, M_VKERNEL);
414 struct vmspace_entry *
415 vkernel_find_vmspace(struct vkernel_common *vc, void *id)
417 struct vmspace_entry *ve;
418 struct vmspace_entry key;
421 ve = RB_FIND(vmspace_rb_tree, &vc->vc_root, &key);
426 * Manage vkernel refs, used by the kernel when fork()ing or exit()ing
430 vkernel_inherit(struct proc *p1, struct proc *p2)
432 struct vkernel_common *vc;
437 KKASSERT(vc->vc_refs > 0);
438 atomic_add_int(&vc->vc_refs, 1);
439 vk = kmalloc(sizeof(*vk), M_VKERNEL, M_WAITOK|M_ZERO);
445 vkernel_exit(struct proc *p)
447 struct vkernel_common *vc;
448 struct vmspace_entry *ve;
455 vk->vk_common = NULL;
458 * Restore the original VM context if we are killed while running
461 * This isn't supposed to happen. What is supposed to happen is
462 * that the process should enter vkernel_trap() before the handling
465 if ((ve = vk->vk_current) != NULL) {
466 kprintf("Killed with active VC, notify kernel list\n");
468 db_print_backtrace();
470 vk->vk_current = NULL;
472 p->p_vmspace = vk->vk_save_vmspace;
474 vk->vk_save_vmspace = NULL;
475 KKASSERT(ve->refs > 0);
480 * Dereference the common area
482 KKASSERT(vc->vc_refs > 0);
483 spin_lock_wr(&vc->vc_spin);
484 if (--vc->vc_refs == 0)
486 spin_unlock_wr(&vc->vc_spin);
489 RB_SCAN(vmspace_rb_tree, &vc->vc_root, NULL,
490 rb_vmspace_delete, vc);
491 kfree(vc, M_VKERNEL);
493 kfree(vk, M_VKERNEL);
497 * A VM space under virtual kernel control trapped out or made a system call
498 * or otherwise needs to return control to the virtual kernel context.
501 vkernel_trap(struct proc *p, struct trapframe *frame)
503 struct vmspace_entry *ve;
508 * Which vmspace entry was running?
512 vk->vk_current = NULL;
513 KKASSERT(ve != NULL);
516 * Switch the process context back to the virtual kernel's VM space.
519 p->p_vmspace = vk->vk_save_vmspace;
521 vk->vk_save_vmspace = NULL;
522 KKASSERT(ve->refs > 0);
526 * Copy the emulated process frame to the virtual kernel process.
527 * The emulated process cannot change TLS descriptors so don't
528 * bother saving them, we already have a copy.
530 * Restore the virtual kernel's saved context so the virtual kernel
531 * process can resume.
533 error = copyout(frame, vk->vk_user_trapframe, sizeof(*frame));
534 bcopy(&vk->vk_save_trapframe, frame, sizeof(*frame));
535 bcopy(&vk->vk_save_vextframe.vx_tls, &curthread->td_tls,
536 sizeof(vk->vk_save_vextframe.vx_tls));