Initial revision

6 files changed, 371 insertions, 0 deletions

diff --git a/libpager/inhibit-term.c b/libpager/inhibit-term.c
new file mode 100644
index 00000000..9eb5f47c
--- /dev/null
+++ b/libpager/inhibit-term.c
@@ -0,0 +1,34 @@
+/* Locks to inhibit termination races for pager library
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/* Prevent this memory object from being terminated. */
+/* Must be called with interlock held. */
+void
+_pager_block_termination (struct pager *p)
+{
+  p->noterm++;
+}
+
+/* Allow termination again. */
+/* Must be called with interlock held. */
+void
+_pagerallow_termination (struct pager *p)
+{
+  if (!--p->noterm && p->termwaiting)
+    condition_broadcast (&p->wakeup);
+}
diff --git a/libpager/mark-error.c b/libpager/mark-error.c
new file mode 100644
index 00000000..1463035c
--- /dev/null
+++ b/libpager/mark-error.c
@@ -0,0 +1,96 @@
+/* Recording errors for pager library
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/* Some error has happened indicating that the page cannot be written. 
+   (Usually this is ENOSPC or EDQOUT.)  On the next pagein which
+   requests write access, return the error to the kernel.  (This is 
+   screwy because of the rules associated with m_o_lock_request.) */
+void
+mark_next_request_error(struct pager *p,
+			int offset,
+			int length,
+			error_t error)
+{
+  int page_error;
+  char *p;
+
+  offset /= __vm_page_size;
+  length /= __vm_page_size;
+  
+  switch (error)
+    {
+    case 0:
+      page_error = PAGE_NOERR;
+      break;
+    case ENOSPC:
+      page_error = PAGE_ENOSPC;
+      break;
+    case EIO:
+      page_error = PAGE_EIO;
+      break;
+    case EDQUOT:
+      page_error = PAGE_EDQUOT;
+      break;
+    default:
+      panic ("mark_object_error");
+      break;
+    }
+  
+  for (p = p->pagemap; p < p->pagemap + length; p++)
+    *p = SET_PM_NEXTERROR (*p, page_error);
+}
+
+/* We are returning a pager error to the kernel.  Write down
+   in the pager what that error was so that the exception handling
+   routines can find out.  (This is only necessary because the
+   XP interface is not completely implemented in the kernel.) */
+void
+mark_object_error(struct pager *p,
+		  int offset,
+		  int length,
+		  error_t error)
+{
+  int page_error = 0;
+  char *p;
+
+  offset /= __vm_page_size;
+  length /= __vm_page_size;
+  
+  switch (error)
+    {
+    case 0:
+      page_error = PAGE_NOERR;
+      break;
+    case ENOSPC:
+      page_error = PAGE_ENOSPC;
+      break;
+    case EIO:
+      page_error = PAGE_EIO;
+      break;
+    case EDQUOT:
+      page_error = PAGE_EDQUOT;
+      break;
+    default:
+      panic ("mark_object_error");
+      break;
+    }
+  
+  for (p = p->pagemap; p < p->pagemap + length; p++)
+    *p = SET_PM_ERROR (*p, page_error);
+}
+
diff --git a/libpager/object-terminate.c b/libpager/object-terminate.c
new file mode 100644
index 00000000..251fc6db
--- /dev/null
+++ b/libpager/object-terminate.c
@@ -0,0 +1,94 @@
+/* Implementation of memory_object_terminate for pager library
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/* Called by the kernel when a shutdown has finished. */
+/* This is a dual of seqnos_memory_object_init. */
+kern_return_t
+seqnos_memory_object_terminate (mach_port_t object, 
+				mach_port_seqno_t seqno,
+				mach_port_t control,
+				mach_port_t name)
+{
+  struct pager *p;
+  struct lock_request *lr;
+  int wakeup;
+  
+  if (!(p = check_port_type (object, pager_port_type)))
+    return EOPNOTSUPP;
+  
+  if (control != p->memobjcntl)
+    {
+      printf ("incg terminate: wrong control port");
+      goto out;
+    }
+  if (name != p->memobjname)
+    {
+      printf ("incg terminate: wrong name port");
+      goto out;
+    }
+
+  if (p->pager_type != FILE_DATA && p->pager_type != SINDIR)
+    {
+      printf ("unexpected m_o_terminate\n");
+      goto out;
+    }      
+
+  mutex_lock (&p->interlock);
+
+  _pager_wait_for_seqno (p, seqno);
+
+  while (p->noterm)
+    {
+      p->termwaiting = 1;
+      condition_wait (&p->wakeup, &p->interlock);
+    }
+
+  wakeup = 0;
+  for (lr = p->lock_requests; lr; lr = lr->next)
+    {
+      lr->locks_pending = 0;
+      if (!lr->pending_writes)
+	wakeup = 1;
+    }
+  if (wakeup)
+    condition_broadcast (&p->wakeup);
+
+  mach_port_deallocate (mach_task_self (), control);
+  mach_port_deallocate (mach_task_self (), name);
+
+  /* Free the pagemap */
+  if (p->pagemapsize)
+    {
+      vm_deallocate (mach_task_self (), (u_int)p->pagemap, p->pagemapsize);
+      p->pagemapsize = 0;
+      p->pagemap = 0;
+    }
+  
+  p->pager_state = NOTINIT;
+  _pager_release_seqno (p);
+
+  mutex_unlock (&p->interlock);
+
+  if (shutting_down)
+    /* Drop the user reference rather than waiting for the user to do it. */
+    done_with_port (p);
+
+ out:
+  done_with_port (p);
+  return 0;
+}
diff --git a/libpager/pagemap.c b/libpager/pagemap.c
new file mode 100644
index 00000000..c09a4d04
--- /dev/null
+++ b/libpager/pagemap.c
@@ -0,0 +1,40 @@
+/* Pagemap manipulation for pager library
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+  
+/* Grow the pagemap as necessary to deal with address OFF */
+void
+pagemap_resize (struct pager *p,
+		int off)
+{
+  void *newaddr;
+  int newsize;
+  
+  if (p->pagemapsize && !p->pagemap)
+    panic ("pagemap failure");
+
+  off /= __vm_page_size;
+  if (p->pagemapsize >= off)
+    return;
+  
+  newsize = round_page (off);
+  vm_allocate (mach_task_self (), (u_int *)&newaddr, newsize, 1);
+  bcopy (p->pagemap, newaddr, p->pagemapsize);
+  vm_deallocate (mach_task_self (), (u_int)p->pagemap, p->pagemapsize);
+  p->pagemap = newaddr;
+  p->pagemapsize = newsize;
+}
diff --git a/libpager/seqnos.c b/libpager/seqnos.c
new file mode 100644
index 00000000..c1a5ba3d
--- /dev/null
+++ b/libpager/seqnos.c
@@ -0,0 +1,41 @@
+/* Sequence number synchronization routines for pager library
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* Wait until all preceding messages on this port have
+   had a chance to be honored. */
+void
+_pager_wait_for_seqno (struct pager *p,
+		int seqno)
+{
+  while (seqno != p->seqno + 1)
+    {
+      p->waitingforseqno = 1;
+      condition_wait (&p->wakeup, &p->interlock);
+    }
+  p->seqno = seqno;
+}
+
+/* Allow the next message in. */
+void
+release_seqno (struct pager *p)
+{
+  if (p->waitingforseqno)
+    {
+      p->waitingforseqno = 0;
+      condition_broadcast (&p->wakeup);
+    }
+}
diff --git a/libpager/stubs.c b/libpager/stubs.c
new file mode 100644
index 00000000..a8830d70
--- /dev/null
+++ b/libpager/stubs.c
@@ -0,0 +1,66 @@
+/* Unused memory object interface stubs
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+error_t
+seqnos_memory_object_copy (mach_port_t old,
+			   mach_port_seqno_t seq,
+			   memory_object_control_t old_ctl,
+			   vm_offset_t off,
+			   vm_size_t len,
+			   mach_port_t new)
+{
+  printf ("m_o_copy called\n");
+  return EOPNOTSUPP;
+}
+
+error_t
+seqnos_memory_object_data_write (mach_port_t old,
+				 mach_port_seqno_t seq,
+				 mach_port_t ctl,
+				 vm_offset_t off,
+				 pointer_t data,
+				 vm_size_t data_cnt)
+{
+  printf ("m_o_data_write called\n");
+  return EOPNOTSUPP;
+}
+
+error_t
+seqnos_memory_object_supply_completed (mach_port_t obj,
+				       mach_port_seqno_t seq,
+				       mach_port_t ctl,
+				       vm_offset_t off,
+				       vm_size_t len,
+				       error_t result,
+				       vm_offset_t err_off)
+{
+  printf ("m_o_supply_completed called\n");
+  return EOPNOTSUPP;
+}
+
+error_t
+seqnos_memory_object_change_completed (mach_port_t obj,
+				       mach_port_seqno_t seq,
+				       boolean_t maycache,
+				       memory_object_copy_strategy_t strat)
+{
+  printf ("m_o_change_completed called\n");
+  return EOPNOTSUPP;
+}
+
+