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/******************************************************************************
* domain_page.h
*
* Allow temporary mapping of domain pages. Based on ideas from the
* Linux PKMAP code -- the copyrights and credits are retained below.
*/
/*
* (C) 1999 Andrea Arcangeli, SuSE GmbH, andrea@suse.de
* Gerhard Wichert, Siemens AG, Gerhard.Wichert@pdb.siemens.de *
* Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
*/
#include <xen/config.h>
#include <xen/sched.h>
#include <xen/mm.h>
#include <xen/perfc.h>
#include <asm/domain_page.h>
#include <asm/flushtlb.h>
#include <asm/hardirq.h>
unsigned long *mapcache;
static unsigned int map_idx, epoch, shadow_epoch[NR_CPUS];
static spinlock_t map_lock = SPIN_LOCK_UNLOCKED;
/* Use a spare PTE bit to mark entries ready for recycling. */
#define READY_FOR_TLB_FLUSH (1<<10)
static void flush_all_ready_maps(void)
{
unsigned long *cache = mapcache;
/* A bit skanky -- depends on having an aligned PAGE_SIZE set of PTEs. */
do {
if ( (*cache & READY_FOR_TLB_FLUSH) )
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