Author: kib
Date: Sat Sep 22 12:36:31 2012
New Revision: 240818
URL: http://svn.freebsd.org/changeset/base/240818
Log:
MFC r237477:
Move the code dealing with shared page into a dedicated
kern_sharedpage.c source file from kern_exec.c.
Added:
stable/9/sys/kern/kern_sharedpage.c
- copied unchanged from r237477, head/sys/kern/kern_sharedpage.c
Modified:
stable/9/sys/conf/files
stable/9/sys/kern/kern_exec.c
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/conf/ (props changed)
Modified: stable/9/sys/conf/files
==============================================================================
--- stable/9/sys/conf/files Sat Sep 22 12:35:22 2012 (r240817)
+++ stable/9/sys/conf/files Sat Sep 22 12:36:31 2012 (r240818)
@@ -2388,6 +2388,7 @@ kern/kern_rmlock.c standard
kern/kern_rwlock.c standard
kern/kern_sdt.c optional kdtrace_hooks
kern/kern_sema.c standard
+kern/kern_sharedpage.c standard
kern/kern_shutdown.c standard
kern/kern_sig.c standard
kern/kern_switch.c standard
Modified: stable/9/sys/kern/kern_exec.c
==============================================================================
--- stable/9/sys/kern/kern_exec.c Sat Sep 22 12:35:22 2012
(r240817)
+++ stable/9/sys/kern/kern_exec.c Sat Sep 22 12:36:31 2012
(r240818)
@@ -28,7 +28,6 @@
__FBSDID("$FreeBSD$");
#include "opt_capsicum.h"
-#include "opt_compat.h"
#include "opt_hwpmc_hooks.h"
#include "opt_kdtrace.h"
#include "opt_ktrace.h"
@@ -65,7 +64,6 @@ __FBSDID("$FreeBSD$");
#include <sys/sysent.h>
#include <sys/shm.h>
#include <sys/sysctl.h>
-#include <sys/vdso.h>
#include <sys/vnode.h>
#include <sys/stat.h>
#ifdef KTRACE
@@ -1515,193 +1513,3 @@ exec_unregister(execsw_arg)
execsw = newexecsw;
return (0);
}
-
-static struct sx shared_page_alloc_sx;
-static vm_object_t shared_page_obj;
-static int shared_page_free;
-char *shared_page_mapping;
-
-void
-shared_page_write(int base, int size, const void *data)
-{
-
- bcopy(data, shared_page_mapping + base, size);
-}
-
-static int
-shared_page_alloc_locked(int size, int align)
-{
- int res;
-
- res = roundup(shared_page_free, align);
- if (res + size >= IDX_TO_OFF(shared_page_obj->size))
- res = -1;
- else
- shared_page_free = res + size;
- return (res);
-}
-
-int
-shared_page_alloc(int size, int align)
-{
- int res;
-
- sx_xlock(&shared_page_alloc_sx);
- res = shared_page_alloc_locked(size, align);
- sx_xunlock(&shared_page_alloc_sx);
- return (res);
-}
-
-int
-shared_page_fill(int size, int align, const void *data)
-{
- int res;
-
- sx_xlock(&shared_page_alloc_sx);
- res = shared_page_alloc_locked(size, align);
- if (res != -1)
- shared_page_write(res, size, data);
- sx_xunlock(&shared_page_alloc_sx);
- return (res);
-}
-
-static void
-shared_page_init(void *dummy __unused)
-{
- vm_page_t m;
- vm_offset_t addr;
-
- sx_init(&shared_page_alloc_sx, "shpsx");
- shared_page_obj = vm_pager_allocate(OBJT_PHYS, 0, PAGE_SIZE,
- VM_PROT_DEFAULT, 0, NULL);
- VM_OBJECT_LOCK(shared_page_obj);
- m = vm_page_grab(shared_page_obj, 0, VM_ALLOC_RETRY | VM_ALLOC_NOBUSY |
- VM_ALLOC_ZERO);
- m->valid = VM_PAGE_BITS_ALL;
- VM_OBJECT_UNLOCK(shared_page_obj);
- addr = kmem_alloc_nofault(kernel_map, PAGE_SIZE);
- pmap_qenter(addr, &m, 1);
- shared_page_mapping = (char *)addr;
-}
-
-SYSINIT(shp, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t)shared_page_init,
- NULL);
-
-static void
-timehands_update(struct sysentvec *sv)
-{
- struct vdso_timehands th;
- struct vdso_timekeep *tk;
- uint32_t enabled, idx;
-
- enabled = tc_fill_vdso_timehands(&th);
- tk = (struct vdso_timekeep *)(shared_page_mapping +
- sv->sv_timekeep_off);
- idx = sv->sv_timekeep_curr;
- atomic_store_rel_32(&tk->tk_th[idx].th_gen, 0);
- if (++idx >= VDSO_TH_NUM)
- idx = 0;
- sv->sv_timekeep_curr = idx;
- if (++sv->sv_timekeep_gen == 0)
- sv->sv_timekeep_gen = 1;
- th.th_gen = 0;
- if (enabled)
- tk->tk_th[idx] = th;
- tk->tk_enabled = enabled;
- atomic_store_rel_32(&tk->tk_th[idx].th_gen, sv->sv_timekeep_gen);
- tk->tk_current = idx;
-}
-
-#ifdef COMPAT_FREEBSD32
-static void
-timehands_update32(struct sysentvec *sv)
-{
- struct vdso_timekeep32 *tk;
- struct vdso_timehands32 th;
- uint32_t enabled, idx;
-
- enabled = tc_fill_vdso_timehands32(&th);
- tk = (struct vdso_timekeep32 *)(shared_page_mapping +
- sv->sv_timekeep_off);
- idx = sv->sv_timekeep_curr;
- atomic_store_rel_32(&tk->tk_th[idx].th_gen, 0);
- if (++idx >= VDSO_TH_NUM)
- idx = 0;
- sv->sv_timekeep_curr = idx;
- if (++sv->sv_timekeep_gen == 0)
- sv->sv_timekeep_gen = 1;
- th.th_gen = 0;
- if (enabled)
- tk->tk_th[idx] = th;
- tk->tk_enabled = enabled;
- atomic_store_rel_32(&tk->tk_th[idx].th_gen, sv->sv_timekeep_gen);
- tk->tk_current = idx;
-}
-#endif
-
-/*
- * This is hackish, but easiest way to avoid creating list structures
- * that needs to be iterated over from the hardclock interrupt
- * context.
- */
-static struct sysentvec *host_sysentvec;
-#ifdef COMPAT_FREEBSD32
-static struct sysentvec *compat32_sysentvec;
-#endif
-
-void
-timekeep_push_vdso(void)
-{
-
- if (host_sysentvec != NULL && host_sysentvec->sv_timekeep_base != 0)
- timehands_update(host_sysentvec);
-#ifdef COMPAT_FREEBSD32
- if (compat32_sysentvec != NULL &&
- compat32_sysentvec->sv_timekeep_base != 0)
- timehands_update32(compat32_sysentvec);
-#endif
-}
-
-void
-exec_sysvec_init(void *param)
-{
- struct sysentvec *sv;
- int tk_base;
- uint32_t tk_ver;
-
- sv = (struct sysentvec *)param;
-
- if ((sv->sv_flags & SV_SHP) == 0)
- return;
- sv->sv_shared_page_obj = shared_page_obj;
- sv->sv_sigcode_base = sv->sv_shared_page_base +
- shared_page_fill(*(sv->sv_szsigcode), 16, sv->sv_sigcode);
- if ((sv->sv_flags & SV_ABI_MASK) != SV_ABI_FREEBSD)
- return;
- tk_ver = VDSO_TK_VER_CURR;
-#ifdef COMPAT_FREEBSD32
- if ((sv->sv_flags & SV_ILP32) != 0) {
- tk_base = shared_page_alloc(sizeof(struct vdso_timekeep32) +
- sizeof(struct vdso_timehands32) * VDSO_TH_NUM, 16);
- KASSERT(tk_base != -1, ("tk_base -1 for 32bit"));
- shared_page_write(tk_base + offsetof(struct vdso_timekeep32,
- tk_ver), sizeof(uint32_t), &tk_ver);
- KASSERT(compat32_sysentvec == 0,
- ("Native compat32 already registered"));
- compat32_sysentvec = sv;
- } else {
-#endif
- tk_base = shared_page_alloc(sizeof(struct vdso_timekeep) +
- sizeof(struct vdso_timehands) * VDSO_TH_NUM, 16);
- KASSERT(tk_base != -1, ("tk_base -1 for native"));
- shared_page_write(tk_base + offsetof(struct vdso_timekeep,
- tk_ver), sizeof(uint32_t), &tk_ver);
- KASSERT(host_sysentvec == 0, ("Native already registered"));
- host_sysentvec = sv;
-#ifdef COMPAT_FREEBSD32
- }
-#endif
- sv->sv_timekeep_base = sv->sv_shared_page_base + tk_base;
- sv->sv_timekeep_off = tk_base;
- timekeep_push_vdso();
-}
Copied: stable/9/sys/kern/kern_sharedpage.c (from r237477,
head/sys/kern/kern_sharedpage.c)
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ stable/9/sys/kern/kern_sharedpage.c Sat Sep 22 12:36:31 2012
(r240818, copy of r237477, head/sys/kern/kern_sharedpage.c)
@@ -0,0 +1,240 @@
+/*-
+ * Copyright (c) 2010, 2012 Konstantin Belousov <[email protected]>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_compat.h"
+#include "opt_vm.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/sysent.h>
+#include <sys/sysctl.h>
+#include <sys/vdso.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+#include <vm/vm_extern.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_map.h>
+#include <vm/vm_object.h>
+#include <vm/vm_page.h>
+#include <vm/vm_pager.h>
+
+static struct sx shared_page_alloc_sx;
+static vm_object_t shared_page_obj;
+static int shared_page_free;
+char *shared_page_mapping;
+
+void
+shared_page_write(int base, int size, const void *data)
+{
+
+ bcopy(data, shared_page_mapping + base, size);
+}
+
+static int
+shared_page_alloc_locked(int size, int align)
+{
+ int res;
+
+ res = roundup(shared_page_free, align);
+ if (res + size >= IDX_TO_OFF(shared_page_obj->size))
+ res = -1;
+ else
+ shared_page_free = res + size;
+ return (res);
+}
+
+int
+shared_page_alloc(int size, int align)
+{
+ int res;
+
+ sx_xlock(&shared_page_alloc_sx);
+ res = shared_page_alloc_locked(size, align);
+ sx_xunlock(&shared_page_alloc_sx);
+ return (res);
+}
+
+int
+shared_page_fill(int size, int align, const void *data)
+{
+ int res;
+
+ sx_xlock(&shared_page_alloc_sx);
+ res = shared_page_alloc_locked(size, align);
+ if (res != -1)
+ shared_page_write(res, size, data);
+ sx_xunlock(&shared_page_alloc_sx);
+ return (res);
+}
+
+static void
+shared_page_init(void *dummy __unused)
+{
+ vm_page_t m;
+ vm_offset_t addr;
+
+ sx_init(&shared_page_alloc_sx, "shpsx");
+ shared_page_obj = vm_pager_allocate(OBJT_PHYS, 0, PAGE_SIZE,
+ VM_PROT_DEFAULT, 0, NULL);
+ VM_OBJECT_LOCK(shared_page_obj);
+ m = vm_page_grab(shared_page_obj, 0, VM_ALLOC_RETRY | VM_ALLOC_NOBUSY |
+ VM_ALLOC_ZERO);
+ m->valid = VM_PAGE_BITS_ALL;
+ VM_OBJECT_UNLOCK(shared_page_obj);
+ addr = kmem_alloc_nofault(kernel_map, PAGE_SIZE);
+ pmap_qenter(addr, &m, 1);
+ shared_page_mapping = (char *)addr;
+}
+
+SYSINIT(shp, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t)shared_page_init,
+ NULL);
+
+static void
+timehands_update(struct sysentvec *sv)
+{
+ struct vdso_timehands th;
+ struct vdso_timekeep *tk;
+ uint32_t enabled, idx;
+
+ enabled = tc_fill_vdso_timehands(&th);
+ tk = (struct vdso_timekeep *)(shared_page_mapping +
+ sv->sv_timekeep_off);
+ idx = sv->sv_timekeep_curr;
+ atomic_store_rel_32(&tk->tk_th[idx].th_gen, 0);
+ if (++idx >= VDSO_TH_NUM)
+ idx = 0;
+ sv->sv_timekeep_curr = idx;
+ if (++sv->sv_timekeep_gen == 0)
+ sv->sv_timekeep_gen = 1;
+ th.th_gen = 0;
+ if (enabled)
+ tk->tk_th[idx] = th;
+ tk->tk_enabled = enabled;
+ atomic_store_rel_32(&tk->tk_th[idx].th_gen, sv->sv_timekeep_gen);
+ tk->tk_current = idx;
+}
+
+#ifdef COMPAT_FREEBSD32
+static void
+timehands_update32(struct sysentvec *sv)
+{
+ struct vdso_timekeep32 *tk;
+ struct vdso_timehands32 th;
+ uint32_t enabled, idx;
+
+ enabled = tc_fill_vdso_timehands32(&th);
+ tk = (struct vdso_timekeep32 *)(shared_page_mapping +
+ sv->sv_timekeep_off);
+ idx = sv->sv_timekeep_curr;
+ atomic_store_rel_32(&tk->tk_th[idx].th_gen, 0);
+ if (++idx >= VDSO_TH_NUM)
+ idx = 0;
+ sv->sv_timekeep_curr = idx;
+ if (++sv->sv_timekeep_gen == 0)
+ sv->sv_timekeep_gen = 1;
+ th.th_gen = 0;
+ if (enabled)
+ tk->tk_th[idx] = th;
+ tk->tk_enabled = enabled;
+ atomic_store_rel_32(&tk->tk_th[idx].th_gen, sv->sv_timekeep_gen);
+ tk->tk_current = idx;
+}
+#endif
+
+/*
+ * This is hackish, but easiest way to avoid creating list structures
+ * that needs to be iterated over from the hardclock interrupt
+ * context.
+ */
+static struct sysentvec *host_sysentvec;
+#ifdef COMPAT_FREEBSD32
+static struct sysentvec *compat32_sysentvec;
+#endif
+
+void
+timekeep_push_vdso(void)
+{
+
+ if (host_sysentvec != NULL && host_sysentvec->sv_timekeep_base != 0)
+ timehands_update(host_sysentvec);
+#ifdef COMPAT_FREEBSD32
+ if (compat32_sysentvec != NULL &&
+ compat32_sysentvec->sv_timekeep_base != 0)
+ timehands_update32(compat32_sysentvec);
+#endif
+}
+
+void
+exec_sysvec_init(void *param)
+{
+ struct sysentvec *sv;
+ int tk_base;
+ uint32_t tk_ver;
+
+ sv = (struct sysentvec *)param;
+
+ if ((sv->sv_flags & SV_SHP) == 0)
+ return;
+ sv->sv_shared_page_obj = shared_page_obj;
+ sv->sv_sigcode_base = sv->sv_shared_page_base +
+ shared_page_fill(*(sv->sv_szsigcode), 16, sv->sv_sigcode);
+ if ((sv->sv_flags & SV_ABI_MASK) != SV_ABI_FREEBSD)
+ return;
+ tk_ver = VDSO_TK_VER_CURR;
+#ifdef COMPAT_FREEBSD32
+ if ((sv->sv_flags & SV_ILP32) != 0) {
+ tk_base = shared_page_alloc(sizeof(struct vdso_timekeep32) +
+ sizeof(struct vdso_timehands32) * VDSO_TH_NUM, 16);
+ KASSERT(tk_base != -1, ("tk_base -1 for 32bit"));
+ shared_page_write(tk_base + offsetof(struct vdso_timekeep32,
+ tk_ver), sizeof(uint32_t), &tk_ver);
+ KASSERT(compat32_sysentvec == 0,
+ ("Native compat32 already registered"));
+ compat32_sysentvec = sv;
+ } else {
+#endif
+ tk_base = shared_page_alloc(sizeof(struct vdso_timekeep) +
+ sizeof(struct vdso_timehands) * VDSO_TH_NUM, 16);
+ KASSERT(tk_base != -1, ("tk_base -1 for native"));
+ shared_page_write(tk_base + offsetof(struct vdso_timekeep,
+ tk_ver), sizeof(uint32_t), &tk_ver);
+ KASSERT(host_sysentvec == 0, ("Native already registered"));
+ host_sysentvec = sv;
+#ifdef COMPAT_FREEBSD32
+ }
+#endif
+ sv->sv_timekeep_base = sv->sv_shared_page_base + tk_base;
+ sv->sv_timekeep_off = tk_base;
+ timekeep_push_vdso();
+}
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