pmap.h

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 * describes one mapping).
 */

struct pv_entry;

struct pv_head {
	simple_lock_data_t pvh_lock;	/* locks every pv on this list */
	struct pv_entry *pvh_list;	/* head of list (locked by pvh_lock) */
};

struct pv_entry {			/* locked by its list's pvh_lock */
	struct pv_entry *pv_next;	/* next entry */
	struct pmap *pv_pmap;		/* the pmap */
	vaddr_t pv_va;			/* the virtual address */
	struct vm_page *pv_ptp;		/* the vm_page of the PTP */
};

/*
 * pv_entrys are dynamically allocated in chunks from a single page.
 * we keep track of how many pv_entrys are in use for each page and
 * we can free pv_entry pages if needed.  there is one lock for the
 * entire allocation system.
 */

struct pv_page_info {
	TAILQ_ENTRY(pv_page) pvpi_list;
	struct pv_entry *pvpi_pvfree;
	int pvpi_nfree;
};

/*
 * number of pv_entry's in a pv_page
 * (note: won't work on systems where NPBG isn't a constant)
 */

#define PVE_PER_PVPAGE ((NBPG - sizeof(struct pv_page_info)) / \
			sizeof(struct pv_entry))

/*
 * a pv_page: where pv_entrys are allocated from
 */

struct pv_page {
	struct pv_page_info pvinfo;
	struct pv_entry pvents[PVE_PER_PVPAGE];
};

/*
 * pmap_remove_record: a record of VAs that have been unmapped, used to
 * flush TLB.  if we have more than PMAP_RR_MAX then we stop recording.
 */

#define PMAP_RR_MAX	16	/* max of 16 pages (64K) */

struct pmap_remove_record {
	int prr_npages;
	vaddr_t prr_vas[PMAP_RR_MAX];
};

#if 0
/*
 * pmap_transfer_location: used to pass the current location in the
 * pmap between pmap_transfer and pmap_transfer_ptes [e.g. during
 * a pmap_copy].
 */

struct pmap_transfer_location {
	vaddr_t addr;			/* the address (page-aligned) */
	pt_entry_t *pte;		/* the PTE that maps address */
	struct vm_page *ptp;		/* the PTP that the PTE lives in */
};
#endif

/*
 * global kernel variables
 */

/* PTDpaddr: is the physical address of the kernel's PDP */
extern u_long PTDpaddr;

extern struct pmap kernel_pmap_store;	/* kernel pmap */
extern int nkpde;			/* current # of PDEs for kernel */
extern int pmap_pg_g;			/* do we support PG_G? */

/*
 * macros
 */

#define	pmap_kernel()			(&kernel_pmap_store)
#define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
#define	pmap_wired_count(pmap)		((pmap)->pm_stats.wired_count)
#define	pmap_update()			tlbflush()

#define pmap_clear_modify(pg)		pmap_change_attrs(pg, 0, PG_M)
#define pmap_clear_reference(pg)	pmap_change_attrs(pg, 0, PG_U)
#define pmap_copy(DP,SP,D,L,S)		
#define pmap_is_modified(pg)		pmap_test_attrs(pg, PG_M)
#define pmap_is_referenced(pg)		pmap_test_attrs(pg, PG_U)
#define pmap_move(DP,SP,D,L,S)		
#define pmap_phys_address(ppn)		i386_ptob(ppn)
#define pmap_valid_entry(E) 		((E) & PG_V) /* is PDE or PTE valid? */


/*
 * prototypes
 */

void		pmap_activate __P((struct proc *));
void		pmap_bootstrap __P((vaddr_t));
boolean_t	pmap_change_attrs __P((struct vm_page *, int, int));
void		pmap_deactivate __P((struct proc *));
static void	pmap_page_protect __P((struct vm_page *, vm_prot_t));
void		pmap_page_remove  __P((struct vm_page *));
static void	pmap_protect __P((struct pmap *, vaddr_t,
				vaddr_t, vm_prot_t));
void		pmap_remove __P((struct pmap *, vaddr_t, vaddr_t));
boolean_t	pmap_test_attrs __P((struct vm_page *, int));
void		pmap_transfer __P((struct pmap *, struct pmap *, vaddr_t,
				   vsize_t, vaddr_t, boolean_t));
static void	pmap_update_pg __P((vaddr_t));
static void	pmap_update_2pg __P((vaddr_t,vaddr_t));
void		pmap_write_protect __P((struct pmap *, vaddr_t,
				vaddr_t, vm_prot_t));

vaddr_t reserve_dumppages __P((vaddr_t)); /* XXX: not a pmap fn */

#define PMAP_GROWKERNEL		/* turn on pmap_growkernel interface */

/*
 * Do idle page zero'ing uncached to avoid polluting the cache.
 */
boolean_t	pmap_zero_page_uncached __P((paddr_t));
#define	PMAP_PAGEIDLEZERO(pa)	pmap_zero_page_uncached((pa))

/*
 * inline functions
 */

/*
 * pmap_update_pg: flush one page from the TLB (or flush the whole thing
 *	if hardware doesn't support one-page flushing)
 */

__inline static void
pmap_update_pg(va)
	vaddr_t va;
{
#if defined(I386_CPU)
	if (cpu_class == CPUCLASS_386)
		pmap_update();
	else
#endif
		invlpg((u_int) va);
}

/*
 * pmap_update_2pg: flush two pages from the TLB
 */

__inline static void
pmap_update_2pg(va, vb)
	vaddr_t va, vb;
{
#if defined(I386_CPU)
	if (cpu_class == CPUCLASS_386)
		pmap_update();
	else
#endif
	{
		invlpg((u_int) va);
		invlpg((u_int) vb);
	}
}

/*
 * pmap_page_protect: change the protection of all recorded mappings
 *	of a managed page
 *
 * => this function is a frontend for pmap_page_remove/pmap_change_attrs
 * => we only have to worry about making the page more protected.
 *	unprotecting a page is done on-demand at fault time.
 */

__inline static void
pmap_page_protect(pg, prot)
	struct vm_page *pg;
	vm_prot_t prot;
{
	if ((prot & VM_PROT_WRITE) == 0) {
		if (prot & (VM_PROT_READ|VM_PROT_EXECUTE)) {
			(void) pmap_change_attrs(pg, PG_RO, PG_RW);
		} else {
			pmap_page_remove(pg);
		}
	}
}

/*
 * pmap_protect: change the protection of pages in a pmap
 *
 * => this function is a frontend for pmap_remove/pmap_write_protect
 * => we only have to worry about making the page more protected.
 *	unprotecting a page is done on-demand at fault time.
 */

__inline static void
pmap_protect(pmap, sva, eva, prot)
	struct pmap *pmap;
	vaddr_t sva, eva;
	vm_prot_t prot;
{
	if ((prot & VM_PROT_WRITE) == 0) {
		if (prot & (VM_PROT_READ|VM_PROT_EXECUTE)) {
			pmap_write_protect(pmap, sva, eva, prot);
		} else {
			pmap_remove(pmap, sva, eva);
		}
	}
}

/*
 * various address inlines
 *
 *  vtopte: return a pointer to the PTE mapping a VA, works only for
 *  user and PT addresses
 *
 *  kvtopte: return a pointer to the PTE mapping a kernel VA
 */

#include <lib/libkern/libkern.h>

static __inline pt_entry_t *
vtopte(vaddr_t va)
{

	KASSERT(va < (PDSLOT_KERN << PDSHIFT));

	return (PTE_BASE + i386_btop(va));
}

static __inline pt_entry_t *
kvtopte(vaddr_t va)
{

	KASSERT(va >= (PDSLOT_KERN << PDSHIFT));

#ifdef LARGEPAGES
	{
		pd_entry_t *pde;

		pde = PDP_BASE + pdei(va);
		if (*pde & PG_PS)
			return ((pt_entry_t *)pde);
	}
#endif

	return (PTE_BASE + i386_btop(va));
}

paddr_t vtophys __P((vaddr_t));
vaddr_t	pmap_map __P((vaddr_t, paddr_t, paddr_t, vm_prot_t));

#if defined(USER_LDT)
void	pmap_ldt_cleanup __P((struct proc *));
#define	PMAP_FORK
#endif /* USER_LDT */

#endif /* _KERNEL */
#endif	/* _I386_PMAP_H_ */