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/*
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. */
#include "priv.h"
#define EXC_TABLE_SIZE 1024 /* Ack!XXX -- should be dynamically sized! */
/* This is the table of addresses for which we should report faults
back to the faulting thread. */
static struct
{
struct pager *p;
vm_offset_t pager_offset;
void *offset;
long length;
} memory_fault_table[EXC_TABLE_SIZE];
static spin_lock_t memory_fault_lock;
/* Mark the memory at ADDR continuing for LEN bytes as mapped from pager P
at offset OFF. Call when vm_map-ing part of the disk.
CAVEAT: addr must not be zero. */
void
diskfs_register_memory_fault_area (struct pager *p,
vm_address_t off,
void *addr,
long len)
{
int i;
assert (addr);
spin_lock (&memory_fault_lock);
for (i = 0; i < EXC_TABLE_SIZE; i++)
if (!memory_fault_table[i].offset)
{
memory_fault_table[i].p = p;
memory_fault_table[i].pager_offset = off;
memory_fault_table[i].offset = addr;
memory_fault_table[i].length = len;
spin_unlock (&memory_fault_lock);
return;
}
assert (0);
}
/* Mark the memory at ADDR continuing for LEN bytes as no longer
mapped from the disk. Call when vm_unmap-ing part of the disk. */
void
diskfs_unregister_memory_fault_area (void *addr,
long len)
{
int i;
assert (addr);
spin_lock (&memory_fault_lock);
for (i = 0; i < EXC_TABLE_SIZE; i++)
if (memory_fault_table[i].offset == addr
&& memory_fault_table[i].length == len)
{
memory_fault_table[i].offset = 0;
spin_unlock (&memory_fault_lock);
return;
}
assert (0);
}
/* Set up the exception handling system. */
void
init_exceptions ()
{
int i;
for (i = 0; i < EXC_TABLE_SIZE; i++)
memory_fault_table[i].offset = 0;
spin_lock_init (&memory_fault_lock);
#if notdebugging
mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE, &excport);
mach_port_insert_right (mach_task_self (), excport, excport,
MACH_MSG_TYPE_MAKE_SEND);
task_get_special_port (mach_task_self (), TASK_EXCEPTION_PORT, &oldexcport);
task_set_special_port (mach_task_self (), TASK_EXCEPTION_PORT, excport);
mach_port_deallocate (mach_task_self (), excport);
#endif
}
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