2 * Copyright (c) 2010, 2012 Konstantin Belousov <kib@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "opt_compat.h"
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/mutex.h>
38 #include <sys/sysent.h>
39 #include <sys/sysctl.h>
43 #include <vm/vm_param.h>
45 #include <vm/vm_extern.h>
46 #include <vm/vm_kern.h>
47 #include <vm/vm_map.h>
48 #include <vm/vm_object.h>
49 #include <vm/vm_page.h>
50 #include <vm/vm_pager.h>
52 static struct sx shared_page_alloc_sx;
53 static vm_object_t shared_page_obj;
54 static int shared_page_free;
55 char *shared_page_mapping;
58 shared_page_write(int base, int size, const void *data)
61 bcopy(data, shared_page_mapping + base, size);
65 shared_page_alloc_locked(int size, int align)
69 res = roundup(shared_page_free, align);
70 if (res + size >= IDX_TO_OFF(shared_page_obj->size))
73 shared_page_free = res + size;
78 shared_page_alloc(int size, int align)
82 sx_xlock(&shared_page_alloc_sx);
83 res = shared_page_alloc_locked(size, align);
84 sx_xunlock(&shared_page_alloc_sx);
89 shared_page_fill(int size, int align, const void *data)
93 sx_xlock(&shared_page_alloc_sx);
94 res = shared_page_alloc_locked(size, align);
96 shared_page_write(res, size, data);
97 sx_xunlock(&shared_page_alloc_sx);
102 shared_page_init(void *dummy __unused)
107 sx_init(&shared_page_alloc_sx, "shpsx");
108 shared_page_obj = vm_pager_allocate(OBJT_PHYS, 0, PAGE_SIZE,
109 VM_PROT_DEFAULT, 0, NULL);
110 VM_OBJECT_LOCK(shared_page_obj);
111 m = vm_page_grab(shared_page_obj, 0, VM_ALLOC_RETRY | VM_ALLOC_NOBUSY |
113 m->valid = VM_PAGE_BITS_ALL;
114 VM_OBJECT_UNLOCK(shared_page_obj);
115 addr = kmem_alloc_nofault(kernel_map, PAGE_SIZE);
116 pmap_qenter(addr, &m, 1);
117 shared_page_mapping = (char *)addr;
120 SYSINIT(shp, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t)shared_page_init,
124 timehands_update(struct sysentvec *sv)
126 struct vdso_timehands th;
127 struct vdso_timekeep *tk;
128 uint32_t enabled, idx;
130 enabled = tc_fill_vdso_timehands(&th);
131 tk = (struct vdso_timekeep *)(shared_page_mapping +
132 sv->sv_timekeep_off);
133 idx = sv->sv_timekeep_curr;
134 atomic_store_rel_32(&tk->tk_th[idx].th_gen, 0);
135 if (++idx >= VDSO_TH_NUM)
137 sv->sv_timekeep_curr = idx;
138 if (++sv->sv_timekeep_gen == 0)
139 sv->sv_timekeep_gen = 1;
143 tk->tk_enabled = enabled;
144 atomic_store_rel_32(&tk->tk_th[idx].th_gen, sv->sv_timekeep_gen);
145 tk->tk_current = idx;
148 #ifdef COMPAT_FREEBSD32
150 timehands_update32(struct sysentvec *sv)
152 struct vdso_timekeep32 *tk;
153 struct vdso_timehands32 th;
154 uint32_t enabled, idx;
156 enabled = tc_fill_vdso_timehands32(&th);
157 tk = (struct vdso_timekeep32 *)(shared_page_mapping +
158 sv->sv_timekeep_off);
159 idx = sv->sv_timekeep_curr;
160 atomic_store_rel_32(&tk->tk_th[idx].th_gen, 0);
161 if (++idx >= VDSO_TH_NUM)
163 sv->sv_timekeep_curr = idx;
164 if (++sv->sv_timekeep_gen == 0)
165 sv->sv_timekeep_gen = 1;
169 tk->tk_enabled = enabled;
170 atomic_store_rel_32(&tk->tk_th[idx].th_gen, sv->sv_timekeep_gen);
171 tk->tk_current = idx;
176 * This is hackish, but easiest way to avoid creating list structures
177 * that needs to be iterated over from the hardclock interrupt
180 static struct sysentvec *host_sysentvec;
181 #ifdef COMPAT_FREEBSD32
182 static struct sysentvec *compat32_sysentvec;
186 timekeep_push_vdso(void)
189 if (host_sysentvec != NULL && host_sysentvec->sv_timekeep_base != 0)
190 timehands_update(host_sysentvec);
191 #ifdef COMPAT_FREEBSD32
192 if (compat32_sysentvec != NULL &&
193 compat32_sysentvec->sv_timekeep_base != 0)
194 timehands_update32(compat32_sysentvec);
199 exec_sysvec_init(void *param)
201 struct sysentvec *sv;
205 sv = (struct sysentvec *)param;
207 if ((sv->sv_flags & SV_SHP) == 0)
209 sv->sv_shared_page_obj = shared_page_obj;
210 sv->sv_sigcode_base = sv->sv_shared_page_base +
211 shared_page_fill(*(sv->sv_szsigcode), 16, sv->sv_sigcode);
212 if ((sv->sv_flags & SV_ABI_MASK) != SV_ABI_FREEBSD)
214 tk_ver = VDSO_TK_VER_CURR;
215 #ifdef COMPAT_FREEBSD32
216 if ((sv->sv_flags & SV_ILP32) != 0) {
217 tk_base = shared_page_alloc(sizeof(struct vdso_timekeep32) +
218 sizeof(struct vdso_timehands32) * VDSO_TH_NUM, 16);
219 KASSERT(tk_base != -1, ("tk_base -1 for 32bit"));
220 shared_page_write(tk_base + offsetof(struct vdso_timekeep32,
221 tk_ver), sizeof(uint32_t), &tk_ver);
222 KASSERT(compat32_sysentvec == 0,
223 ("Native compat32 already registered"));
224 compat32_sysentvec = sv;
227 tk_base = shared_page_alloc(sizeof(struct vdso_timekeep) +
228 sizeof(struct vdso_timehands) * VDSO_TH_NUM, 16);
229 KASSERT(tk_base != -1, ("tk_base -1 for native"));
230 shared_page_write(tk_base + offsetof(struct vdso_timekeep,
231 tk_ver), sizeof(uint32_t), &tk_ver);
232 KASSERT(host_sysentvec == 0, ("Native already registered"));
234 #ifdef COMPAT_FREEBSD32
237 sv->sv_timekeep_base = sv->sv_shared_page_base + tk_base;
238 sv->sv_timekeep_off = tk_base;
239 timekeep_push_vdso();