[apple/xnu.git] / osfmk / i386 / pmap_common.c

/*
 * 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,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
#include <vm/pmap.h>
#include <kern/ledger.h>
#include <i386/pmap_internal.h>


/*
 *	Each entry in the pv_head_table is locked by a bit in the
 *	pv_lock_table.  The lock bits are accessed by the physical
 *	address of the page they lock.
 */

char	*pv_lock_table;		/* pointer to array of bits */
char    *pv_hash_lock_table;

pv_rooted_entry_t	pv_head_table;		/* array of entries, one per
						 * page */
uint32_t			pv_hashed_free_count = 0;
uint32_t			pv_hashed_kern_free_count = 0;

pmap_pagetable_corruption_record_t pmap_pagetable_corruption_records[PMAP_PAGETABLE_CORRUPTION_MAX_LOG];
uint32_t pmap_pagetable_corruption_incidents;
uint64_t pmap_pagetable_corruption_last_abstime = (~(0ULL) >> 1);
uint64_t pmap_pagetable_corruption_interval_abstime;
thread_call_t 	pmap_pagetable_corruption_log_call;
static thread_call_data_t 	pmap_pagetable_corruption_log_call_data;
boolean_t pmap_pagetable_corruption_timeout = FALSE;

volatile uint32_t	mappingrecurse = 0;

uint32_t  pv_hashed_low_water_mark, pv_hashed_kern_low_water_mark, pv_hashed_alloc_chunk, pv_hashed_kern_alloc_chunk;

thread_t mapping_replenish_thread;
event_t	mapping_replenish_event, pmap_user_pv_throttle_event;

uint64_t pmap_pv_throttle_stat, pmap_pv_throttled_waiters;

unsigned int pmap_cache_attributes(ppnum_t pn) {
	if (pmap_get_cache_attributes(pn) & INTEL_PTE_NCACHE)
	        return (VM_WIMG_IO);
	else
		return (VM_WIMG_COPYBACK);
}

void	pmap_set_cache_attributes(ppnum_t pn, unsigned int cacheattr) {
	unsigned int current, template = 0;
	int pai;

	if (cacheattr & VM_MEM_NOT_CACHEABLE) {
		if(!(cacheattr & VM_MEM_GUARDED))
			template |= PHYS_PTA;
		template |= PHYS_NCACHE;
	}

	pmap_intr_assert();

	assert((pn != vm_page_fictitious_addr) && (pn != vm_page_guard_addr));

	pai = ppn_to_pai(pn);

	if (!IS_MANAGED_PAGE(pai)) {
		return;
	}

	/* override cache attributes for this phys page
	 * Does not walk through existing mappings to adjust,
	 * assumes page is disconnected
	 */

	LOCK_PVH(pai);

	pmap_update_cache_attributes_locked(pn, template);

	current = pmap_phys_attributes[pai] & PHYS_CACHEABILITY_MASK;
	pmap_phys_attributes[pai] &= ~PHYS_CACHEABILITY_MASK;
	pmap_phys_attributes[pai] |= template;

	UNLOCK_PVH(pai);

	if ((template & PHYS_NCACHE) && !(current & PHYS_NCACHE)) {
		pmap_sync_page_attributes_phys(pn);
	}
}

unsigned	pmap_get_cache_attributes(ppnum_t pn) {
	if (last_managed_page == 0)
		return 0;

	if (!IS_MANAGED_PAGE(ppn_to_pai(pn))) {
	    return INTEL_PTE_NCACHE;
	}

	/*
	 * The cache attributes are read locklessly for efficiency.
	 */
	unsigned int attr = pmap_phys_attributes[ppn_to_pai(pn)];
	unsigned int template = 0;
	
	if (attr & PHYS_PTA)
		template |= INTEL_PTE_PTA;
	if (attr & PHYS_NCACHE)
		template |= INTEL_PTE_NCACHE;
	return template;
}


boolean_t
pmap_is_noencrypt(ppnum_t pn)
{
	int		pai;

	pai = ppn_to_pai(pn);

	if (!IS_MANAGED_PAGE(pai))
		return (FALSE);

	if (pmap_phys_attributes[pai] & PHYS_NOENCRYPT)
		return (TRUE);

	return (FALSE);
}


void
pmap_set_noencrypt(ppnum_t pn)
{
	int		pai;

	pai = ppn_to_pai(pn);

	if (IS_MANAGED_PAGE(pai)) {
		LOCK_PVH(pai);

		pmap_phys_attributes[pai] |= PHYS_NOENCRYPT;

		UNLOCK_PVH(pai);
	}
}


void
pmap_clear_noencrypt(ppnum_t pn)
{
	int		pai;

	pai = ppn_to_pai(pn);

	if (IS_MANAGED_PAGE(pai)) {
		/*
		 * synchronization at VM layer prevents PHYS_NOENCRYPT
		 * from changing state, so we don't need the lock to inspect
		 */
		if (pmap_phys_attributes[pai] & PHYS_NOENCRYPT) {
			LOCK_PVH(pai);

			pmap_phys_attributes[pai] &= ~PHYS_NOENCRYPT;

			UNLOCK_PVH(pai);
		}
	}
}

void
compute_pmap_gc_throttle(void *arg __unused)
{
	
}


void
pmap_lock_phys_page(ppnum_t pn)
{
	int		pai;

	pai = ppn_to_pai(pn);

	if (IS_MANAGED_PAGE(pai)) {
		LOCK_PVH(pai);
	} else
		simple_lock(&phys_backup_lock);
}


void
pmap_unlock_phys_page(ppnum_t pn)
{
	int		pai;

	pai = ppn_to_pai(pn);

	if (IS_MANAGED_PAGE(pai)) {
		UNLOCK_PVH(pai);
	} else
		simple_unlock(&phys_backup_lock);
}


__private_extern__ void
pmap_pagetable_corruption_msg_log(int (*log_func)(const char * fmt, ...)__printflike(1,2)) {
	if (pmap_pagetable_corruption_incidents > 0) {
		int i, e = MIN(pmap_pagetable_corruption_incidents, PMAP_PAGETABLE_CORRUPTION_MAX_LOG);
		(*log_func)("%u pagetable corruption incident(s) detected, timeout: %u\n", pmap_pagetable_corruption_incidents, pmap_pagetable_corruption_timeout);
		for (i = 0; i < e; i++) {
			(*log_func)("Incident 0x%x, reason: 0x%x, action: 0x%x, time: 0x%llx\n", pmap_pagetable_corruption_records[i].incident,  pmap_pagetable_corruption_records[i].reason, pmap_pagetable_corruption_records[i].action, pmap_pagetable_corruption_records[i].abstime);
		}
	}
}

static inline void
pmap_pagetable_corruption_log_setup(void) {
	if (pmap_pagetable_corruption_log_call == NULL) {
		nanotime_to_absolutetime(PMAP_PAGETABLE_CORRUPTION_INTERVAL, 0, &pmap_pagetable_corruption_interval_abstime);
		thread_call_setup(&pmap_pagetable_corruption_log_call_data,
		    (thread_call_func_t) pmap_pagetable_corruption_msg_log,
		    (thread_call_param_t) &printf);
		pmap_pagetable_corruption_log_call = &pmap_pagetable_corruption_log_call_data;
	}
}

void
mapping_free_prime(void)
{
	unsigned		i;
	pv_hashed_entry_t	pvh_e;
	pv_hashed_entry_t	pvh_eh;
	pv_hashed_entry_t	pvh_et;
	int			pv_cnt;

	/* Scale based on DRAM size */
	pv_hashed_low_water_mark = MAX(PV_HASHED_LOW_WATER_MARK_DEFAULT, ((uint32_t)(sane_size >> 30)) * 2000);
	pv_hashed_low_water_mark = MIN(pv_hashed_low_water_mark, 16000);
	/* Alterable via sysctl */
	pv_hashed_kern_low_water_mark = MAX(PV_HASHED_KERN_LOW_WATER_MARK_DEFAULT, ((uint32_t)(sane_size >> 30)) * 1000);
	pv_hashed_kern_low_water_mark = MIN(pv_hashed_kern_low_water_mark, 16000);
	pv_hashed_kern_alloc_chunk = PV_HASHED_KERN_ALLOC_CHUNK_INITIAL;
	pv_hashed_alloc_chunk = PV_HASHED_ALLOC_CHUNK_INITIAL;

	pv_cnt = 0;
	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;

	for (i = 0; i < (5 * PV_HASHED_ALLOC_CHUNK_INITIAL); i++) {
		pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);

		pvh_e->qlink.next = (queue_entry_t)pvh_eh;
		pvh_eh = pvh_e;

		if (pvh_et == PV_HASHED_ENTRY_NULL)
		        pvh_et = pvh_e;
		pv_cnt++;
	}
	PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt);

	pv_cnt = 0;
	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
	for (i = 0; i < PV_HASHED_KERN_ALLOC_CHUNK_INITIAL; i++) {
		pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);

		pvh_e->qlink.next = (queue_entry_t)pvh_eh;
		pvh_eh = pvh_e;

		if (pvh_et == PV_HASHED_ENTRY_NULL)
		        pvh_et = pvh_e;
		pv_cnt++;
	}
	PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
}

void mapping_replenish(void);

void mapping_adjust(void) {
	kern_return_t mres;

	pmap_pagetable_corruption_log_setup();

	mres = kernel_thread_start_priority((thread_continue_t)mapping_replenish, NULL, MAXPRI_KERNEL, &mapping_replenish_thread);
	if (mres != KERN_SUCCESS) {
		panic("pmap: mapping_replenish_thread creation failed");
	}
	thread_deallocate(mapping_replenish_thread);
}

unsigned pmap_mapping_thread_wakeups;	
unsigned pmap_kernel_reserve_replenish_stat;
unsigned pmap_user_reserve_replenish_stat;
unsigned pmap_kern_reserve_alloc_stat;

void mapping_replenish(void)
{
	pv_hashed_entry_t	pvh_e;
	pv_hashed_entry_t	pvh_eh;
	pv_hashed_entry_t	pvh_et;
	int			pv_cnt;
	unsigned             	i;

	/* We qualify for VM privileges...*/
	current_thread()->options |= TH_OPT_VMPRIV;

	for (;;) {

		while (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark) {
			pv_cnt = 0;
			pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;

			for (i = 0; i < pv_hashed_kern_alloc_chunk; i++) {
				pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
				pvh_e->qlink.next = (queue_entry_t)pvh_eh;
				pvh_eh = pvh_e;

				if (pvh_et == PV_HASHED_ENTRY_NULL)
					pvh_et = pvh_e;
				pv_cnt++;
			}
			pmap_kernel_reserve_replenish_stat += pv_cnt;
			PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
		}

		pv_cnt = 0;
		pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;

		if (pv_hashed_free_count < pv_hashed_low_water_mark) {
			for (i = 0; i < pv_hashed_alloc_chunk; i++) {
				pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);

				pvh_e->qlink.next = (queue_entry_t)pvh_eh;
				pvh_eh = pvh_e;

				if (pvh_et == PV_HASHED_ENTRY_NULL)
					pvh_et = pvh_e;
				pv_cnt++;
			}
			pmap_user_reserve_replenish_stat += pv_cnt;
			PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
		}
/* Wake threads throttled while the kernel reserve was being replenished.
 */
		if (pmap_pv_throttled_waiters) {
			pmap_pv_throttled_waiters = 0;
			thread_wakeup(&pmap_user_pv_throttle_event);
		}
		/* Check if the kernel pool has been depleted since the
		 * first pass, to reduce refill latency.
		 */
		if (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark)
			continue;
		/* Block sans continuation to avoid yielding kernel stack */
		assert_wait(&mapping_replenish_event, THREAD_UNINT);
		mappingrecurse = 0;
		thread_block(THREAD_CONTINUE_NULL);
		pmap_mapping_thread_wakeups++;
	}
}

/*
 *	Set specified attribute bits.
 */

void
phys_attribute_set(
	ppnum_t		pn,
	int		bits)
{
	int		pai;

	pmap_intr_assert();
	assert(pn != vm_page_fictitious_addr);
	if (pn == vm_page_guard_addr)
		return;

	pai = ppn_to_pai(pn);

	if (!IS_MANAGED_PAGE(pai)) {
		/* Not a managed page.  */
		return;
	}

	LOCK_PVH(pai);
	pmap_phys_attributes[pai] |= bits;
	UNLOCK_PVH(pai);
}

/*
 *	Set the modify bit on the specified physical page.
 */

void
pmap_set_modify(ppnum_t pn)
{
	phys_attribute_set(pn, PHYS_MODIFIED);
}

/*
 *	Clear the modify bits on the specified physical page.
 */

void
pmap_clear_modify(ppnum_t pn)
{
	phys_attribute_clear(pn, PHYS_MODIFIED, 0, NULL);
}

/*
 *	pmap_is_modified:
 *
 *	Return whether or not the specified physical page is modified
 *	by any physical maps.
 */

boolean_t
pmap_is_modified(ppnum_t pn)
{
	if (phys_attribute_test(pn, PHYS_MODIFIED))
		return TRUE;
	return FALSE;
}


/*
 *	pmap_clear_reference:
 *
 *	Clear the reference bit on the specified physical page.
 */

void
pmap_clear_reference(ppnum_t pn)
{
	phys_attribute_clear(pn, PHYS_REFERENCED, 0, NULL);
}

void
pmap_set_reference(ppnum_t pn)
{
	phys_attribute_set(pn, PHYS_REFERENCED);
}

/*
 *	pmap_is_referenced:
 *
 *	Return whether or not the specified physical page is referenced
 *	by any physical maps.
 */

boolean_t
pmap_is_referenced(ppnum_t pn)
{
        if (phys_attribute_test(pn, PHYS_REFERENCED))
		return TRUE;
	return FALSE;
}


/*
 * pmap_get_refmod(phys)
 *  returns the referenced and modified bits of the specified
 *  physical page.
 */
unsigned int
pmap_get_refmod(ppnum_t pn)
{
        int		refmod;
	unsigned int	retval = 0;

	refmod = phys_attribute_test(pn, PHYS_MODIFIED | PHYS_REFERENCED);

	if (refmod & PHYS_MODIFIED)
	        retval |= VM_MEM_MODIFIED;
	if (refmod & PHYS_REFERENCED)
	        retval |= VM_MEM_REFERENCED;

	return (retval);
}


void
pmap_clear_refmod_options(ppnum_t pn, unsigned int mask, unsigned int options, void *arg)
{
        unsigned int  x86Mask;

        x86Mask = (   ((mask &   VM_MEM_MODIFIED)?   PHYS_MODIFIED : 0)
		      | ((mask & VM_MEM_REFERENCED)? PHYS_REFERENCED : 0));

        phys_attribute_clear(pn, x86Mask, options, arg);
}

/*
 * pmap_clear_refmod(phys, mask)
 *  clears the referenced and modified bits as specified by the mask
 *  of the specified physical page.
 */
void
pmap_clear_refmod(ppnum_t pn, unsigned int mask)
{
	unsigned int  x86Mask;

	x86Mask = (   ((mask &   VM_MEM_MODIFIED)?   PHYS_MODIFIED : 0)
	            | ((mask & VM_MEM_REFERENCED)? PHYS_REFERENCED : 0));

	phys_attribute_clear(pn, x86Mask, 0, NULL);
}

unsigned int
pmap_disconnect(ppnum_t pa)
{
	return (pmap_disconnect_options(pa, 0, NULL));
}

/*
 *	Routine:
 *		pmap_disconnect_options
 *
 *	Function:
 *		Disconnect all mappings for this page and return reference and change status
 *		in generic format.
 *
 */
unsigned int
pmap_disconnect_options(ppnum_t pa, unsigned int options, void *arg)
{
	unsigned refmod, vmrefmod = 0;

	pmap_page_protect_options(pa, 0, options, arg);		/* disconnect the page */

	pmap_assert(pa != vm_page_fictitious_addr);
	if ((pa == vm_page_guard_addr) || !IS_MANAGED_PAGE(pa) || (options & PMAP_OPTIONS_NOREFMOD))
		return 0;
	refmod = pmap_phys_attributes[pa] & (PHYS_MODIFIED | PHYS_REFERENCED);
	
	if (refmod & PHYS_MODIFIED)
	        vmrefmod |= VM_MEM_MODIFIED;
	if (refmod & PHYS_REFERENCED)
	        vmrefmod |= VM_MEM_REFERENCED;

	return vmrefmod;
}
Commit	Line	Data
6d2010ae A	1	/*
	2	* Copyright (c) 2000-2010 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	#include <vm/pmap.h>
316670eb	29	#include <kern/ledger.h>
6d2010ae A	30	#include <i386/pmap_internal.h>
6d2010ae A	31
316670eb	32
6d2010ae A	33	/*
	34	* Each entry in the pv_head_table is locked by a bit in the
	35	* pv_lock_table. The lock bits are accessed by the physical
	36	* address of the page they lock.
	37	*/
	38
	39	char pv_lock_table; / pointer to array of bits */
	40	char *pv_hash_lock_table;
	41
	42	pv_rooted_entry_t pv_head_table; /* array of entries, one per
	43	* page */
	44	uint32_t pv_hashed_free_count = 0;
	45	uint32_t pv_hashed_kern_free_count = 0;
	46
	47	pmap_pagetable_corruption_record_t pmap_pagetable_corruption_records[PMAP_PAGETABLE_CORRUPTION_MAX_LOG];
	48	uint32_t pmap_pagetable_corruption_incidents;
	49	uint64_t pmap_pagetable_corruption_last_abstime = (~(0ULL) >> 1);
	50	uint64_t pmap_pagetable_corruption_interval_abstime;
	51	thread_call_t pmap_pagetable_corruption_log_call;
	52	static thread_call_data_t pmap_pagetable_corruption_log_call_data;
	53	boolean_t pmap_pagetable_corruption_timeout = FALSE;
	54
	55	volatile uint32_t mappingrecurse = 0;
	56
	57	uint32_t pv_hashed_low_water_mark, pv_hashed_kern_low_water_mark, pv_hashed_alloc_chunk, pv_hashed_kern_alloc_chunk;
	58
	59	thread_t mapping_replenish_thread;
	60	event_t mapping_replenish_event, pmap_user_pv_throttle_event;
	61
	62	uint64_t pmap_pv_throttle_stat, pmap_pv_throttled_waiters;
	63
	64	unsigned int pmap_cache_attributes(ppnum_t pn) {
	65	if (pmap_get_cache_attributes(pn) & INTEL_PTE_NCACHE)
	66	return (VM_WIMG_IO);
	67	else
	68	return (VM_WIMG_COPYBACK);
	69	}
	70
	71	void pmap_set_cache_attributes(ppnum_t pn, unsigned int cacheattr) {
	72	unsigned int current, template = 0;
	73	int pai;
	74
	75	if (cacheattr & VM_MEM_NOT_CACHEABLE) {
	76	if(!(cacheattr & VM_MEM_GUARDED))
	77	template \|= PHYS_PTA;
	78	template \|= PHYS_NCACHE;
	79	}
	80
	81	pmap_intr_assert();
	82
	83	assert((pn != vm_page_fictitious_addr) && (pn != vm_page_guard_addr));
	84
	85	pai = ppn_to_pai(pn);
	86
	87	if (!IS_MANAGED_PAGE(pai)) {
	88	return;
	89	}
	90
	91	/* override cache attributes for this phys page
	92	* Does not walk through existing mappings to adjust,
	93	* assumes page is disconnected
	94	*/
	95
	96	LOCK_PVH(pai);
97
98	pmap_update_cache_attributes_locked(pn, template);
99
100	current = pmap_phys_attributes[pai] & PHYS_CACHEABILITY_MASK;
101	pmap_phys_attributes[pai] &= ~PHYS_CACHEABILITY_MASK;
102	pmap_phys_attributes[pai] \|= template;
103
104	UNLOCK_PVH(pai);
105
106	if ((template & PHYS_NCACHE) && !(current & PHYS_NCACHE)) {
107	pmap_sync_page_attributes_phys(pn);
108	}
109	}
110
111	unsigned pmap_get_cache_attributes(ppnum_t pn) {
112	if (last_managed_page == 0)
113	return 0;
114
115	if (!IS_MANAGED_PAGE(ppn_to_pai(pn))) {
116	return INTEL_PTE_NCACHE;
117	}
118
119	/*
120	* The cache attributes are read locklessly for efficiency.
121	*/
122	unsigned int attr = pmap_phys_attributes[ppn_to_pai(pn)];
123	unsigned int template = 0;
124
125	if (attr & PHYS_PTA)
126	template \|= INTEL_PTE_PTA;
127	if (attr & PHYS_NCACHE)
128	template \|= INTEL_PTE_NCACHE;
129	return template;
130	}
131
132
133
134	boolean_t
135	pmap_is_noencrypt(ppnum_t pn)
136	{
137	int pai;
138
139	pai = ppn_to_pai(pn);
140
141	if (!IS_MANAGED_PAGE(pai))
7ddcb079	142	return (FALSE);
6d2010ae A	143
	144	if (pmap_phys_attributes[pai] & PHYS_NOENCRYPT)
	145	return (TRUE);
	146
	147	return (FALSE);
	148	}
	149
	150
	151	void
	152	pmap_set_noencrypt(ppnum_t pn)
	153	{
	154	int pai;
	155
	156	pai = ppn_to_pai(pn);
	157
	158	if (IS_MANAGED_PAGE(pai)) {
	159	LOCK_PVH(pai);
	160
	161	pmap_phys_attributes[pai] \|= PHYS_NOENCRYPT;
	162
	163	UNLOCK_PVH(pai);
	164	}
	165	}
	166
	167
	168	void
	169	pmap_clear_noencrypt(ppnum_t pn)
	170	{
	171	int pai;
	172
	173	pai = ppn_to_pai(pn);
	174
	175	if (IS_MANAGED_PAGE(pai)) {
7ddcb079 A	176	/*
	177	* synchronization at VM layer prevents PHYS_NOENCRYPT
	178	* from changing state, so we don't need the lock to inspect
	179	*/
	180	if (pmap_phys_attributes[pai] & PHYS_NOENCRYPT) {
	181	LOCK_PVH(pai);
6d2010ae	182
7ddcb079	183	pmap_phys_attributes[pai] &= ~PHYS_NOENCRYPT;
6d2010ae	184
7ddcb079 A	185	UNLOCK_PVH(pai);
7ddcb079 A	186	}
6d2010ae A	187	}
	188	}
	189
	190	void
	191	compute_pmap_gc_throttle(void *arg __unused)
	192	{
	193
	194	}
	195
	196
fe8ab488 A	197	void
	198	pmap_lock_phys_page(ppnum_t pn)
	199	{
	200	int pai;
	201
	202	pai = ppn_to_pai(pn);
	203
	204	if (IS_MANAGED_PAGE(pai)) {
	205	LOCK_PVH(pai);
	206	} else
	207	simple_lock(&phys_backup_lock);
	208	}
	209
	210
	211	void
	212	pmap_unlock_phys_page(ppnum_t pn)
	213	{
	214	int pai;
	215
	216	pai = ppn_to_pai(pn);
	217
	218	if (IS_MANAGED_PAGE(pai)) {
	219	UNLOCK_PVH(pai);
	220	} else
	221	simple_unlock(&phys_backup_lock);
	222	}
	223
	224
	225
6d2010ae A	226	__private_extern__ void
	227	pmap_pagetable_corruption_msg_log(int (log_func)(const char fmt, ...)__printflike(1,2)) {
	228	if (pmap_pagetable_corruption_incidents > 0) {
	229	int i, e = MIN(pmap_pagetable_corruption_incidents, PMAP_PAGETABLE_CORRUPTION_MAX_LOG);
	230	(*log_func)("%u pagetable corruption incident(s) detected, timeout: %u\n", pmap_pagetable_corruption_incidents, pmap_pagetable_corruption_timeout);
	231	for (i = 0; i < e; i++) {
	232	(*log_func)("Incident 0x%x, reason: 0x%x, action: 0x%x, time: 0x%llx\n", pmap_pagetable_corruption_records[i].incident, pmap_pagetable_corruption_records[i].reason, pmap_pagetable_corruption_records[i].action, pmap_pagetable_corruption_records[i].abstime);
	233	}
	234	}
	235	}
	236
	237	static inline void
	238	pmap_pagetable_corruption_log_setup(void) {
	239	if (pmap_pagetable_corruption_log_call == NULL) {
	240	nanotime_to_absolutetime(PMAP_PAGETABLE_CORRUPTION_INTERVAL, 0, &pmap_pagetable_corruption_interval_abstime);
	241	thread_call_setup(&pmap_pagetable_corruption_log_call_data,
	242	(thread_call_func_t) pmap_pagetable_corruption_msg_log,
	243	(thread_call_param_t) &printf);
	244	pmap_pagetable_corruption_log_call = &pmap_pagetable_corruption_log_call_data;
	245	}
	246	}
	247
	248	void
	249	mapping_free_prime(void)
	250	{
	251	unsigned i;
	252	pv_hashed_entry_t pvh_e;
	253	pv_hashed_entry_t pvh_eh;
	254	pv_hashed_entry_t pvh_et;
	255	int pv_cnt;
	256
	257	/* Scale based on DRAM size */
	258	pv_hashed_low_water_mark = MAX(PV_HASHED_LOW_WATER_MARK_DEFAULT, ((uint32_t)(sane_size >> 30)) * 2000);
	259	pv_hashed_low_water_mark = MIN(pv_hashed_low_water_mark, 16000);
	260	/* Alterable via sysctl */
	261	pv_hashed_kern_low_water_mark = MAX(PV_HASHED_KERN_LOW_WATER_MARK_DEFAULT, ((uint32_t)(sane_size >> 30)) * 1000);
	262	pv_hashed_kern_low_water_mark = MIN(pv_hashed_kern_low_water_mark, 16000);
	263	pv_hashed_kern_alloc_chunk = PV_HASHED_KERN_ALLOC_CHUNK_INITIAL;
	264	pv_hashed_alloc_chunk = PV_HASHED_ALLOC_CHUNK_INITIAL;
	265
	266	pv_cnt = 0;
	267	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
	268
	269	for (i = 0; i < (5 * PV_HASHED_ALLOC_CHUNK_INITIAL); i++) {
	270	pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
	271
	272	pvh_e->qlink.next = (queue_entry_t)pvh_eh;
	273	pvh_eh = pvh_e;
	274
	275	if (pvh_et == PV_HASHED_ENTRY_NULL)
	276	pvh_et = pvh_e;
	277	pv_cnt++;
	278	}
	279	PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
	280
	281	pv_cnt = 0;
	282	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
	283	for (i = 0; i < PV_HASHED_KERN_ALLOC_CHUNK_INITIAL; i++) {
	284	pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
	285
	286	pvh_e->qlink.next = (queue_entry_t)pvh_eh;
	287	pvh_eh = pvh_e;
	288
	289	if (pvh_et == PV_HASHED_ENTRY_NULL)
290	pvh_et = pvh_e;
291	pv_cnt++;
292	}
293	PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
294	}
295
296	void mapping_replenish(void);
297
298	void mapping_adjust(void) {
299	kern_return_t mres;
300
301	pmap_pagetable_corruption_log_setup();
302
303	mres = kernel_thread_start_priority((thread_continue_t)mapping_replenish, NULL, MAXPRI_KERNEL, &mapping_replenish_thread);
304	if (mres != KERN_SUCCESS) {
305	panic("pmap: mapping_replenish_thread creation failed");
306	}
307	thread_deallocate(mapping_replenish_thread);
308	}
309
310	unsigned pmap_mapping_thread_wakeups;
311	unsigned pmap_kernel_reserve_replenish_stat;
312	unsigned pmap_user_reserve_replenish_stat;
313	unsigned pmap_kern_reserve_alloc_stat;
314
315	void mapping_replenish(void)
316	{
317	pv_hashed_entry_t pvh_e;
318	pv_hashed_entry_t pvh_eh;
319	pv_hashed_entry_t pvh_et;
320	int pv_cnt;
321	unsigned i;
322
323	/* We qualify for VM privileges...*/
324	current_thread()->options \|= TH_OPT_VMPRIV;
325
326	for (;;) {
327
328	while (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark) {
329	pv_cnt = 0;
330	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
331
332	for (i = 0; i < pv_hashed_kern_alloc_chunk; i++) {
333	pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
334	pvh_e->qlink.next = (queue_entry_t)pvh_eh;
335	pvh_eh = pvh_e;
336
337	if (pvh_et == PV_HASHED_ENTRY_NULL)
338	pvh_et = pvh_e;
339	pv_cnt++;
340	}
341	pmap_kernel_reserve_replenish_stat += pv_cnt;
342	PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
343	}
344
345	pv_cnt = 0;
346	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
347
348	if (pv_hashed_free_count < pv_hashed_low_water_mark) {
349	for (i = 0; i < pv_hashed_alloc_chunk; i++) {
350	pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
351
352	pvh_e->qlink.next = (queue_entry_t)pvh_eh;
353	pvh_eh = pvh_e;
354
355	if (pvh_et == PV_HASHED_ENTRY_NULL)
356	pvh_et = pvh_e;
357	pv_cnt++;
358	}
359	pmap_user_reserve_replenish_stat += pv_cnt;
360	PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
361	}
362	/* Wake threads throttled while the kernel reserve was being replenished.
363	*/
364	if (pmap_pv_throttled_waiters) {
365	pmap_pv_throttled_waiters = 0;
366	thread_wakeup(&pmap_user_pv_throttle_event);
367	}
368	/* Check if the kernel pool has been depleted since the
369	* first pass, to reduce refill latency.
370	*/
371	if (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark)
372	continue;
373	/* Block sans continuation to avoid yielding kernel stack */
374	assert_wait(&mapping_replenish_event, THREAD_UNINT);
375	mappingrecurse = 0;
376	thread_block(THREAD_CONTINUE_NULL);
377	pmap_mapping_thread_wakeups++;
378	}
379	}
380
381	/*
382	* Set specified attribute bits.
383	*/
384
385	void
386	phys_attribute_set(
387	ppnum_t pn,
388	int bits)
389	{
390	int pai;
391
392	pmap_intr_assert();
393	assert(pn != vm_page_fictitious_addr);
394	if (pn == vm_page_guard_addr)
395	return;
396
397	pai = ppn_to_pai(pn);
398
399	if (!IS_MANAGED_PAGE(pai)) {
400	/* Not a managed page. */
401	return;
402	}
403
404	LOCK_PVH(pai);
405	pmap_phys_attributes[pai] \|= bits;
406	UNLOCK_PVH(pai);
407	}
408
409	/*
410	* Set the modify bit on the specified physical page.
411	*/
412
413	void
414	pmap_set_modify(ppnum_t pn)
415	{
416	phys_attribute_set(pn, PHYS_MODIFIED);
417	}
418
419	/*
420	* Clear the modify bits on the specified physical page.
421	*/
422
423	void
424	pmap_clear_modify(ppnum_t pn)
425	{
39236c6e	426	phys_attribute_clear(pn, PHYS_MODIFIED, 0, NULL);
6d2010ae A	427	}
	428
	429	/*
	430	* pmap_is_modified:
	431	*
	432	* Return whether or not the specified physical page is modified
	433	* by any physical maps.
	434	*/
	435
	436	boolean_t
	437	pmap_is_modified(ppnum_t pn)
	438	{
	439	if (phys_attribute_test(pn, PHYS_MODIFIED))
	440	return TRUE;
	441	return FALSE;
	442	}
	443
	444
	445	/*
	446	* pmap_clear_reference:
	447	*
	448	* Clear the reference bit on the specified physical page.
	449	*/
	450
	451	void
	452	pmap_clear_reference(ppnum_t pn)
	453	{
39236c6e	454	phys_attribute_clear(pn, PHYS_REFERENCED, 0, NULL);
6d2010ae A	455	}
	456
	457	void
	458	pmap_set_reference(ppnum_t pn)
	459	{
	460	phys_attribute_set(pn, PHYS_REFERENCED);
	461	}
	462
	463	/*
	464	* pmap_is_referenced:
	465	*
	466	* Return whether or not the specified physical page is referenced
	467	* by any physical maps.
	468	*/
	469
	470	boolean_t
	471	pmap_is_referenced(ppnum_t pn)
	472	{
	473	if (phys_attribute_test(pn, PHYS_REFERENCED))
	474	return TRUE;
	475	return FALSE;
	476	}
	477
	478
	479	/*
	480	* pmap_get_refmod(phys)
	481	* returns the referenced and modified bits of the specified
	482	* physical page.
	483	*/
	484	unsigned int
	485	pmap_get_refmod(ppnum_t pn)
	486	{
	487	int refmod;
	488	unsigned int retval = 0;
	489
	490	refmod = phys_attribute_test(pn, PHYS_MODIFIED \| PHYS_REFERENCED);
	491
	492	if (refmod & PHYS_MODIFIED)
	493	retval \|= VM_MEM_MODIFIED;
	494	if (refmod & PHYS_REFERENCED)
	495	retval \|= VM_MEM_REFERENCED;
	496
	497	return (retval);
	498	}
	499
39236c6e A	500
	501	void
	502	pmap_clear_refmod_options(ppnum_t pn, unsigned int mask, unsigned int options, void *arg)
	503	{
	504	unsigned int x86Mask;
	505
	506	x86Mask = ( ((mask & VM_MEM_MODIFIED)? PHYS_MODIFIED : 0)
	507	\| ((mask & VM_MEM_REFERENCED)? PHYS_REFERENCED : 0));
	508
	509	phys_attribute_clear(pn, x86Mask, options, arg);
	510	}
	511
6d2010ae A	512	/*
	513	* pmap_clear_refmod(phys, mask)
	514	* clears the referenced and modified bits as specified by the mask
	515	* of the specified physical page.
	516	*/
	517	void
	518	pmap_clear_refmod(ppnum_t pn, unsigned int mask)
	519	{
	520	unsigned int x86Mask;
	521
	522	x86Mask = ( ((mask & VM_MEM_MODIFIED)? PHYS_MODIFIED : 0)
	523	\| ((mask & VM_MEM_REFERENCED)? PHYS_REFERENCED : 0));
39236c6e A	524
	525	phys_attribute_clear(pn, x86Mask, 0, NULL);
	526	}
	527
	528	unsigned int
	529	pmap_disconnect(ppnum_t pa)
	530	{
	531	return (pmap_disconnect_options(pa, 0, NULL));
6d2010ae A	532	}
	533
	534	/*
	535	* Routine:
39236c6e	536	* pmap_disconnect_options
6d2010ae A	537	*
	538	* Function:
	539	* Disconnect all mappings for this page and return reference and change status
	540	* in generic format.
	541	*
	542	*/
	543	unsigned int
39236c6e	544	pmap_disconnect_options(ppnum_t pa, unsigned int options, void *arg)
6d2010ae A	545	{
	546	unsigned refmod, vmrefmod = 0;
	547
39236c6e	548	pmap_page_protect_options(pa, 0, options, arg); /* disconnect the page */
6d2010ae A	549
6d2010ae A	550	pmap_assert(pa != vm_page_fictitious_addr);
39236c6e	551	if ((pa == vm_page_guard_addr) \|\| !IS_MANAGED_PAGE(pa) \|\| (options & PMAP_OPTIONS_NOREFMOD))
6d2010ae A	552	return 0;
	553	refmod = pmap_phys_attributes[pa] & (PHYS_MODIFIED \| PHYS_REFERENCED);
	554
	555	if (refmod & PHYS_MODIFIED)
	556	vmrefmod \|= VM_MEM_MODIFIED;
	557	if (refmod & PHYS_REFERENCED)
	558	vmrefmod \|= VM_MEM_REFERENCED;
	559
	560	return vmrefmod;
	561	}