[hurd] 04/28: wire console display pages

[Samuel Thibault]

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sthibault pushed a commit to branch upstream
in repository hurd.

commit 81fb68fee81769d81c373e3af5a508d706b7e3d6
Author: Samuel Thibault <address@hidden>
Date:   Sun Oct 30 20:58:55 2016 +0100

    wire console display pages
    
    to work around improper handling of getting paged out.
    
    * console/display.c (user_create): Call vm_wire() on the created user data.
---
 console/display.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/console/display.c b/console/display.c
index 98c70f5..ed5571e 100644
--- a/console/display.c
+++ b/console/display.c
@@ -814,6 +814,21 @@ user_create (display_t display, uint32_t width, uint32_t 
height,
   user->cursor.status = CONS_CURSOR_NORMAL;
   conchar_memset (user->_matrix, chr, attr,
                  user->screen.width * user->screen.lines);
+
+  /* FIXME: it seems we don't properly handle getting paged out.
+   * For now, just wire the pages to work around the issue.  */
+  {
+    mach_port_t host;
+
+    error_t err = get_privileged_ports (&host, NULL);
+    if (err)
+      host = mach_host_self ();
+
+    vm_wire (host, mach_task_self (), (vm_offset_t) user,
+            (vm_size_t) npages * vm_page_size, VM_PROT_READ);
+    if (host != mach_host_self ())
+       mach_port_deallocate (mach_task_self (), host);
+  }
   return 0;
 }
 

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