/*
 * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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 * Please see the License for the specific language governing rights and
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 */

#ifndef	_PMAP_PCID_
#define _PMAP_PCID_	1
#if defined(__x86_64__)
void pmap_pcid_initialize(pmap_t);
void pmap_pcid_initialize_kernel(pmap_t);
pcid_t	pmap_pcid_allocate_pcid(int);
void	pmap_pcid_deallocate_pcid(int, pmap_t);
void	pmap_destroy_pcid_sync_action(void *);
void	pmap_destroy_pcid_sync(pmap_t);
void	pmap_pcid_lazy_flush(pmap_t);
void	pmap_pcid_activate(pmap_t, int);
pcid_t	pcid_for_pmap_cpu_tuple(pmap_t, int);

#define PMAP_INVALID ((pmap_t)0xDEAD7347)
#define PMAP_PCID_INVALID_PCID	(0xDEAD)
#define	PMAP_PCID_MAX_REFCOUNT (0xF0)
#define	PMAP_PCID_MIN_PCID (1)

extern uint32_t pmap_pcid_ncpus;

static inline void
tlb_flush_global(void) {
	uintptr_t cr4 = get_cr4();
	pmap_assert(ml_get_interrupts_enabled() == FALSE || get_preemption_level() !=0);
	pmap_assert2(((cr4 & CR4_PGE) || ml_at_interrupt_context()), "CR4: 0x%lx", cr4);
	/*
	 * We are, unfortunately, forced to rely on this expensive
	 * read-modify-write-write scheme due to the inadequate
	 * TLB invalidation ISA. The read is necessary as
	 * the kernel does not "own" the contents of CR4, the VMX
	 * feature in particular. It may be possible to
	 * avoid a global flush and instead track a generation
	 * count of kernel invalidations, but that scheme
	 * has its disadvantages as well.
	 */
	set_cr4(cr4 & ~CR4_PGE);
	set_cr4(cr4 | CR4_PGE); 
	return;
}

static inline void pmap_pcid_invalidate_all_cpus(pmap_t tpmap) {
	unsigned i;

	pmap_assert((sizeof(tpmap->pmap_pcid_coherency_vector) >= real_ncpus) && (!(sizeof(tpmap->pmap_pcid_coherency_vector) & 7)));

	for (i = 0; i < real_ncpus; i+=8) {
          *(uint64_t *)(uintptr_t)&tpmap->pmap_pcid_coherency_vector[i] = (~0ULL);
        }
}

static inline void pmap_pcid_validate_current(void) {
	int	ccpu = cpu_number();
	volatile uint8_t *cptr = cpu_datap(ccpu)->cpu_pmap_pcid_coherentp;
#ifdef	PMAP_MODULE
	pmap_assert(cptr == &(current_thread()->map->pmap->pmap_pcid_coherency_vector[ccpu]));
#endif
	if (cptr) {
		*cptr = 0;
	}

}

static inline void pmap_pcid_invalidate_cpu(pmap_t tpmap, int ccpu) {
	tpmap->pmap_pcid_coherency_vector[ccpu] = 0xFF;
}

static inline void pmap_pcid_validate_cpu(pmap_t tpmap, int ccpu) {
	tpmap->pmap_pcid_coherency_vector[ccpu] = 0;
}
#endif /* x86_64 */
#endif