Move powerpc to vm_page_md, 'throw it in' kettenis@

4 files changed, 129 insertions, 174 deletions

diff --git a/sys/arch/macppc/include/vmparam.h b/sys/arch/macppc/include/vmparam.h
index 485b6877706..9ace5e9b546 100644
--- a/sys/arch/macppc/include/vmparam.h
+++ b/sys/arch/macppc/include/vmparam.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vmparam.h,v 1.17 2006/09/18 16:57:23 marco Exp $	*/
+/*	$OpenBSD: vmparam.h,v 1.18 2007/05/27 15:46:02 drahn Exp $	*/
 /*	$NetBSD: vmparam.h,v 1.1 1996/09/30 16:34:38 ws Exp $	*/
 
 /*-
@@ -89,13 +89,6 @@ extern vaddr_t ppc_kvm_stolen;
 
 #define	VM_PHYS_SIZE		(USRIOSIZE * PAGE_SIZE)
 
-#define __HAVE_PMAP_PHYSSEG
-struct pmap_physseg {
-	struct pted_pv_head *pvent;
-	char *attrs;
-	/* NULL ??? */
-};
-
 #define	VM_PHYSSEG_MAX	32	/* actually we could have this many segments */
 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
 #define	VM_PHYSSEG_NOADD	/* can't add RAM after vm_mem_init */
@@ -103,4 +96,15 @@ struct pmap_physseg {
 #define VM_NFREELIST		1
 #define VM_FREELIST_DEFAULT	0
 
+#define __HAVE_VM_PAGE_MD
+struct pv_entry;
+struct vm_page_md {
+	LIST_HEAD(,pte_desc) pv_list;
+};
+
+#define VM_MDPAGE_INIT(pg) do {                 \
+	LIST_INIT(&((pg)->mdpage.pv_list)); 	\
+} while (0)
+
+
 #endif
diff --git a/sys/arch/macppc/macppc/dma.c b/sys/arch/macppc/macppc/dma.c
index 7803b0804dd..c66dee85b48 100644
--- a/sys/arch/macppc/macppc/dma.c
+++ b/sys/arch/macppc/macppc/dma.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dma.c,v 1.24 2005/12/17 07:31:26 miod Exp $	*/
+/*	$OpenBSD: dma.c,v 1.25 2007/05/27 15:46:02 drahn Exp $	*/
 /*	$NetBSD: machdep.c,v 1.214 1996/11/10 03:16:17 thorpej Exp $	*/
 
 /*-
@@ -387,8 +387,36 @@ void
 _dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset,
 bus_size_t len, int op)
 {
+	int i;
+	bus_size_t minlen, wlen;
+	bus_addr_t pa, addr;
+	struct vm_page *pg;
+
+	for (i = 0; i < map->dm_nsegs && len != 0; i++) {
+		/* Find the beginning segment. */
+		if (offset >= map->dm_segs[i].ds_len) {
+			offset -= map->dm_segs[i].ds_len;
+			continue;
+		}
+
+		minlen = len < map->dm_segs[i].ds_len - offset ?
+		    len : map->dm_segs[i].ds_len - offset;
 
-	/* Nothing to do here. */
+		addr = map->dm_segs[i].ds_addr + offset;
+
+		switch (op) {
+		case BUS_DMASYNC_POSTWRITE:
+			for (pa = trunc_page(addr), wlen = 0;
+			    pa < round_page(addr + minlen);
+			    pa += PAGE_SIZE) {
+				pg = PHYS_TO_VM_PAGE(pa);
+				if (pg != NULL)
+					atomic_clearbits_int(&pg->pg_flags,
+					    PG_PMAP_EXE);
+			}
+		}
+		
+	}
 }
 
 /*
diff --git a/sys/arch/powerpc/include/pmap.h b/sys/arch/powerpc/include/pmap.h
index 1fad03dd0df..51dbf28f286 100644
--- a/sys/arch/powerpc/include/pmap.h
+++ b/sys/arch/powerpc/include/pmap.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.h,v 1.43 2007/05/03 18:40:19 miod Exp $	*/
+/*	$OpenBSD: pmap.h,v 1.44 2007/05/27 15:46:02 drahn Exp $	*/
 /*	$NetBSD: pmap.h,v 1.1 1996/09/30 16:34:29 ws Exp $	*/
 
 /*-
@@ -98,17 +98,17 @@ typedef	struct pmap *pmap_t;
 
 extern struct pmap kernel_pmap_;
 #define	pmap_kernel()	(&kernel_pmap_)
-boolean_t pteclrbits(paddr_t pa, u_int mask, u_int clear);
+boolean_t pteclrbits(struct vm_page *pg, u_int mask, u_int clear);
 
 
 #define pmap_clear_modify(page) \
-	(pteclrbits(VM_PAGE_TO_PHYS(page), PTE_CHG_32, TRUE))
+	(pteclrbits((page), PG_PMAP_MOD, TRUE))
 #define	pmap_clear_reference(page) \
-	(pteclrbits(VM_PAGE_TO_PHYS(page), PTE_REF_32, TRUE))
+	(pteclrbits((page), PG_PMAP_REF, TRUE))
 #define	pmap_is_modified(page) \
-	(pteclrbits(VM_PAGE_TO_PHYS(page), PTE_CHG_32, FALSE))
+	(pteclrbits((page), PG_PMAP_MOD, FALSE))
 #define	pmap_is_referenced(page) \
-	(pteclrbits(VM_PAGE_TO_PHYS(page), PTE_REF_32, FALSE))
+	(pteclrbits((page), PG_PMAP_REF, FALSE))
 
 #define	pmap_unwire(pm, va)
 #define	pmap_phys_address(x)		(x)
@@ -142,6 +142,10 @@ void pmap_proc_iflush(struct proc *proc, vaddr_t va, vsize_t len);
 
 #define	PMAP_STEAL_MEMORY
 
+#define PG_PMAP_MOD     PG_PMAP0
+#define PG_PMAP_REF     PG_PMAP1
+#define PG_PMAP_EXE     PG_PMAP2
+
 #endif	/* _KERNEL */
 #endif	/* _LOCORE */
 #endif	/* _POWERPC_PMAP_H_ */
diff --git a/sys/arch/powerpc/powerpc/pmap.c b/sys/arch/powerpc/powerpc/pmap.c
index fa803856560..dbfd7ab5c75 100644
--- a/sys/arch/powerpc/powerpc/pmap.c
+++ b/sys/arch/powerpc/powerpc/pmap.c
@@ -1,7 +1,7 @@
-/*	$OpenBSD: pmap.c,v 1.100 2007/05/13 03:45:59 drahn Exp $ */
+/*	$OpenBSD: pmap.c,v 1.101 2007/05/27 15:46:02 drahn Exp $ */
 
 /*
- * Copyright (c) 2001, 2002 Dale Rahn.
+ * Copyright (c) 2001, 2002, 2007 Dale Rahn.
  * All rights reserved.
  *
  *   
@@ -33,6 +33,7 @@
 #include <sys/param.h>
 #include <sys/malloc.h>
 #include <sys/proc.h>
+#include <sys/queue.h>
 #include <sys/user.h>
 #include <sys/systm.h>
 #include <sys/pool.h>
@@ -48,15 +49,11 @@
 #include <ddb/db_output.h>
 
 struct pmap kernel_pmap_;
-static int npgs;
 static struct mem_region *pmap_mem, *pmap_avail;
 struct mem_region pmap_allocated[10];
 int pmap_cnt_avail;
 int pmap_cnt_allocated;
 
-
-void * pmap_pvh;
-void * pmap_attrib;
 struct pte_64  *pmap_ptable64;
 struct pte_32  *pmap_ptable32;
 int	pmap_ptab_cnt;
@@ -71,9 +68,6 @@ paddr_t zero_page;
 paddr_t copy_src_page;
 paddr_t copy_dst_page;
 
-/* P->V table */
-LIST_HEAD(pted_pv_head, pte_desc);
-
 struct pte_desc {
 	/* Linked list of phys -> virt entries */
 	LIST_ENTRY(pte_desc) pted_pv_list;
@@ -112,7 +106,7 @@ void pmap_vp_destroy(pmap_t pm);
 struct pte_desc *pmap_vp_lookup(pmap_t pm, vaddr_t va);
 
 /* PV routines */
-int pmap_enter_pv(struct pte_desc *pted, struct pted_pv_head *);
+void pmap_enter_pv(struct pte_desc *pted, struct vm_page *);
 void pmap_remove_pv(struct pte_desc *pted);
 
 
@@ -160,8 +154,6 @@ int pmap_initialized = 0;
 int physmem;
 int physmaxaddr;
 
-#define ATTRSHIFT	4
-
 /* virtual to physical helpers */
 static inline int
 VP_SR(vaddr_t va)
@@ -289,31 +281,6 @@ pmap_vp_enter(pmap_t pm, vaddr_t va, struct pte_desc *pted)
 	pmap_simpleunlock_pm(pm);
 }
 
-/* 
- * HELPER FUNCTIONS 
- */
-static inline struct pted_pv_head *
-pmap_find_pvh(paddr_t pa)
-{
-	int bank, off;
-	bank = vm_physseg_find(atop(pa), &off);
-	if (bank != -1) {
-		return &vm_physmem[bank].pmseg.pvent[off];
-	}
-	return NULL;
-}
-
-static inline char *
-pmap_find_attr(paddr_t pa)
-{
-	int bank, off;
-	bank = vm_physseg_find(atop(pa), &off);
-	if (bank != -1) {
-		return &vm_physmem[bank].pmseg.attrs[off];
-	}
-	return NULL;
-}
-
 /* PTE manipulation/calculations */
 static inline void
 tlbie(vaddr_t va)
@@ -419,22 +386,15 @@ PTED_VALID(struct pte_desc *pted)
  * have too noticable unnecessary ram consumption.
  */
 
-int
-pmap_enter_pv(struct pte_desc *pted, struct pted_pv_head *pvh)
+void
+pmap_enter_pv(struct pte_desc *pted, struct vm_page *pg)
 {
-	int first;
-
 	if (__predict_false(!pmap_initialized)) {
-		return 0;
-	}
-	if (pvh == NULL) {
-		return 0;
+		return;
 	}
 
-	first = LIST_EMPTY(pvh);
-	LIST_INSERT_HEAD(pvh, pted, pted_pv_list);
+	LIST_INSERT_HEAD(&(pg->mdpage.pv_list), pted, pted_pv_list);
 	pted->pted_va |= PTED_VA_MANAGED_M;
-	return first;
 }
 
 void
@@ -443,29 +403,43 @@ pmap_remove_pv(struct pte_desc *pted)
 	LIST_REMOVE(pted, pted_pv_list);
 }
 
+
+/* PTE_CHG_32 == PTE_CHG_64 */
+/* PTE_REF_32 == PTE_REF_64 */
+static __inline u_int
+pmap_pte2flags(u_int32_t pte)
+{
+	return (((pte & PTE_REF_32) ? PG_PMAP_REF : 0) |
+	    ((pte & PTE_CHG_32) ? PG_PMAP_MOD : 0));
+}
+
+static __inline u_int
+pmap_flags2pte(u_int32_t flags)
+{
+	return (((flags & PG_PMAP_REF) ? PTE_REF_32 : 0) |
+	    ((flags & PG_PMAP_MOD) ? PTE_CHG_32 : 0));
+}
+
 void
 pmap_attr_save(paddr_t pa, u_int32_t bits)
 {
-	int bank, pg;
-	u_int8_t *attr;
+	struct vm_page *pg;
 
-	bank = vm_physseg_find(atop(pa), &pg);
-	if (bank == -1)
+	pg = PHYS_TO_VM_PAGE(pa);
+	if (pg == NULL)
 		return;
-	attr = &vm_physmem[bank].pmseg.attrs[pg];
-	*attr |= (u_int8_t)(bits >> ATTRSHIFT);
+
+	atomic_setbits_int(&pg->pg_flags,  pmap_pte2flags(bits));
 }
 
 int
 pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
 {
 	struct pte_desc *pted;
-	struct pted_pv_head *pvh;
+	struct vm_page *pg;
 	int s;
 	int need_sync = 0;
 	int cache;
-	u_int8_t *pattr = NULL;
-	int first_map = 0;
 
 	/* MP - Acquire lock for this pmap */
 
@@ -488,8 +462,8 @@ pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
 	}
 
 	/* Calculate PTE */
-	pvh = pmap_find_pvh(pa);
-	if (pvh != NULL)
+	pg = PHYS_TO_VM_PAGE(pa);
+	if (pg != NULL)
 		cache = PMAP_CACHE_WB; /* managed memory is cacheable */
 	else
 		cache = PMAP_CACHE_CI;
@@ -499,26 +473,8 @@ pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
 	else
 		pmap_fill_pte32(pm, va, pa, pted, prot, flags, cache);
 
-	if (pvh != NULL) {
-		pattr = pmap_find_attr(pa); /* pattr only for managed mem */
-		first_map = pmap_enter_pv(pted, pvh); /* only managed mem */
-	}
-
-	/* 
-	 * We want to flush for executable pages which are not managed???
-	 * Always flush for the first mapping if it is executable.
-	 * If previous mappings exist, but this is the first EXE, sync.
-	 */
-
-	if (prot & VM_PROT_EXECUTE) {
-		need_sync = 1;
-		if (pvh != NULL) {
-			if (!first_map)
-				need_sync =
-				    (*pattr & (PTE_EXE_32 >> ATTRSHIFT)) == 0;
-			else if (pattr != NULL)
-				*pattr = 0;
-		}
+	if (pg != NULL) {
+		pmap_enter_pv(pted, pg); /* only managed mem */
 	}
 
 	/*
@@ -538,15 +494,18 @@ pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
 		if (pm->pm_sr[sn] & SR_NOEXEC)
 			pm->pm_sr[sn] &= ~SR_NOEXEC;
 
-		if (pattr != NULL)
-			*pattr |= (PTE_EXE_32 >> ATTRSHIFT);
+		if (pg != NULL) {
+			need_sync = ((pg->pg_flags & PG_PMAP_EXE) == 0);
+			atomic_setbits_int(&pg->pg_flags, PG_PMAP_EXE);
+		} else
+			need_sync = 1;
 	} else {
 		/*
 		 * Should we be paranoid about writeable non-exec 
 		 * mappings ? if so, clear the exec tag
 		 */
-		if ((prot & VM_PROT_WRITE) && (pattr != NULL))
-			*pattr &= ~(PTE_EXE_32 >> ATTRSHIFT);
+		if ((prot & VM_PROT_WRITE) && (pg != NULL))
+			atomic_clearbits_int(&pg->pg_flags, PG_PMAP_EXE);
 	}
 
 	splx(s);
@@ -712,7 +671,7 @@ _pmap_kenter_pa(vaddr_t va, paddr_t pa, vm_prot_t prot, int flags, int cache)
 	}
 
 	if (cache == PMAP_CACHE_DEFAULT) {
-		if (pmap_find_pvh(pa) != NULL)
+		if (PHYS_TO_VM_PAGE(pa) != NULL)
 			cache = PMAP_CACHE_WB; /* managed memory is cacheable */
 		else
 			cache = PMAP_CACHE_CI;
@@ -980,30 +939,21 @@ pmap_fill_pte32(pmap_t pm, vaddr_t va, paddr_t pa, struct pte_desc *pted,
  * ack, copied code in the pte flush code....
  */
 int
-pteclrbits(paddr_t pa, u_int bit, u_int clear)
+pteclrbits(struct vm_page *pg, u_int flagbit, u_int clear)
 {
-	char *pattr;
 	u_int bits;
 	int s;
 	struct pte_desc *pted;
-	struct pted_pv_head *pvh;
+	u_int ptebit = pmap_flags2pte(flagbit);
 
 	/* PTE_CHG_32 == PTE_CHG_64 */
-	/* PTE_REG_32 == PTE_REG_64 */
-
-	pattr = pmap_find_attr(pa);
-
-	/* check if managed memory */
-	if (pattr == NULL)
-		return 0;
-
-	pvh = pmap_find_pvh(pa);
+	/* PTE_REF_32 == PTE_REF_64 */
 
 	/*
 	 *  First try the attribute cache
 	 */
-	bits = (*pattr << ATTRSHIFT) & bit;
-	if ((bits == bit) && (clear == 0))
+	bits = pg->pg_flags & flagbit;
+	if ((bits == flagbit) && (clear == 0))
 		return bits;
 
 	/* cache did not contain all necessary bits,
@@ -1014,7 +964,7 @@ pteclrbits(paddr_t pa, u_int bit, u_int clear)
 	/* need lock for this pv */
 	s = splvm();
 
-	LIST_FOREACH(pted, pvh, pted_pv_list) {
+	LIST_FOREACH(pted, &(pg->mdpage.pv_list), pted_pv_list) {
 		vaddr_t va = pted->pted_va & PAGE_MASK;
 		pmap_t pm = pted->pted_pmap;
 		struct pte_64 *ptp64;
@@ -1041,16 +991,16 @@ pteclrbits(paddr_t pa, u_int bit, u_int clear)
 			 */
 			if ((pted->p.pted_pte64.pte_hi |
 			    (PTED_HID(pted) ? PTE_HID_64 : 0)) == ptp64->pte_hi) {
-				bits |=	ptp64->pte_lo & bit;
+				bits |=	pmap_pte2flags(ptp64->pte_lo & ptebit);
 				if (clear) {
 					ptp64->pte_hi &= ~PTE_VALID_64;
 					__asm__ volatile ("sync");
 					tlbie(va);
 					tlbsync();
-					ptp64->pte_lo &= ~bit;
+					ptp64->pte_lo &= ~ptebit;
 					__asm__ volatile ("sync");
 					ptp64->pte_hi |= PTE_VALID_64;
-				} else if (bits == bit)
+				} else if (bits == flagbit)
 					break;
 			}
 		} else {
@@ -1069,25 +1019,30 @@ pteclrbits(paddr_t pa, u_int bit, u_int clear)
 			 */
 			if ((pted->p.pted_pte32.pte_hi |
 			    (PTED_HID(pted) ? PTE_HID_32 : 0)) == ptp32->pte_hi) {
-				bits |=	ptp32->pte_lo & bit;
+				bits |=	pmap_pte2flags(ptp32->pte_lo & ptebit);
 				if (clear) {
 					ptp32->pte_hi &= ~PTE_VALID_32;
 					__asm__ volatile ("sync");
 					tlbie(va);
 					tlbsync();
-					ptp32->pte_lo &= ~bit;
+					ptp32->pte_lo &= ~ptebit;
 					__asm__ volatile ("sync");
 					ptp32->pte_hi |= PTE_VALID_32;
-				} else if (bits == bit)
+				} else if (bits == flagbit)
 					break;
 			}
 		}
 	}
 
-	if (clear)
-		*pattr &= ~(bit >> ATTRSHIFT);
-	else
-		*pattr |= (bits >> ATTRSHIFT);
+	if (clear) {
+		/*
+		 * this is done a second time, because while walking the list
+		 * a bit could have been promoted via pmap_attr_save()
+		 */
+		bits |= pg->pg_flags & flagbit;
+		atomic_clearbits_int(&pg->pg_flags,  flagbit); 
+	} else
+		atomic_setbits_int(&pg->pg_flags,  bits);
 
 	splx(s);
 	return bits;
@@ -1659,15 +1614,6 @@ pmap_bootstrap(u_int kernelstart, u_int kernelend)
 
 	tlbia();
 
-	npgs = 0;
-	for (mp = pmap_avail; mp->size; mp++) {
-		npgs += btoc(mp->size);
-	}
-	/* Ok we lose a few pages from this allocation, but hopefully
-	 * not too many 
-	 */
-	pmap_pvh = pmap_steal_avail(sizeof(struct pted_pv_head *) * npgs, 4);
-	pmap_attrib = pmap_steal_avail(sizeof(char) * npgs, 1);
 	pmap_avail_fixup();
 	for (mp = pmap_avail; mp->size; mp++) {
 		if (mp->start > 0x80000000)
@@ -2067,31 +2013,24 @@ pmap_page_ro32(pmap_t pm, vaddr_t va)
 void
 pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
 {
-	paddr_t pa = VM_PAGE_TO_PHYS(pg);
 	int s;
 	struct pte_desc *pted;
-	struct pted_pv_head *pvh;
 
 	/* need to lock for this pv */
 	s = splvm();
-	pvh = pmap_find_pvh(pa);
-
-	/* nothing to do if not a managed page */
-	if (pvh == NULL) {
-		splx(s);
-		return;
-	}
 
 	if (prot == VM_PROT_NONE) {
-		while (!LIST_EMPTY(pvh)) {
-			pted = LIST_FIRST(pvh);
+		while (!LIST_EMPTY(&(pg->mdpage.pv_list))) {
+			pted = LIST_FIRST(&(pg->mdpage.pv_list));
 			pmap_remove_pg(pted->pted_pmap, pted->pted_va);
 		}
+		/* page is being reclaimed, sync icache next use */
+		atomic_clearbits_int(&pg->pg_flags, PG_PMAP_EXE);
 		splx(s);
 		return;
 	}
 	
-	LIST_FOREACH(pted, pvh, pted_pv_list) {
+	LIST_FOREACH(pted, &(pg->mdpage.pv_list), pted_pv_list) {
 		if (ppc_proc_is_64b)
 			pmap_page_ro64(pted->pted_pmap, pted->pted_va, prot);
 		else
@@ -2150,11 +2089,6 @@ pmap_real_memory(paddr_t *start, vsize_t *size)
 void
 pmap_init()
 {
-	vsize_t sz;
-	struct pted_pv_head *pvh;
-	char *attr;
-	int i, bank;
-
 	pool_init(&pmap_pmap_pool, sizeof(struct pmap), 0, 0, 0, "pmap", NULL);
 	pool_setlowat(&pmap_pmap_pool, 2);
 	pool_init(&pmap_vp_pool, sizeof(struct pmapvp), 0, 0, 0, "vp", NULL);
@@ -2163,22 +2097,6 @@ pmap_init()
 	    NULL);
 	pool_setlowat(&pmap_pted_pool, 20);
 
-	/* pmap_pvh and pmap_attr must be allocated 1-1 so that pmap_save_attr
-	 * is callable from pte_spill_r (with vm disabled)
-	 */
-	pvh = (struct pted_pv_head *)pmap_pvh;
-	for (i = npgs; i > 0; i--)
-		LIST_INIT(pvh++);
-	attr = pmap_attrib;
-	bzero(pmap_attrib, npgs);
-	pvh = (struct pted_pv_head *)pmap_pvh;
-	for (bank = 0; bank < vm_nphysseg; bank++) {
-		sz = vm_physmem[bank].end - vm_physmem[bank].start;
-		vm_physmem[bank].pmseg.pvent = pvh;
-		vm_physmem[bank].pmseg.attrs = attr;
-		pvh += sz;
-		attr += sz;
-	}
 	pmap_initialized = 1;
 }
 
@@ -2386,7 +2304,7 @@ pte_insert64(struct pte_desc *pted)
 		__asm volatile ("sync");
 		return;
 	}
-	/* first just try fill of secondary hash */
+	/* try fill of secondary hash */
 	ptp64 = pmap_ptable64 + (idx ^ pmap_ptab_mask) * 8;
 	for (i = 0; i < 8; i++) {
 		if (ptp64[i].pte_hi & PTE_VALID_64)
@@ -2430,7 +2348,7 @@ pte_insert64(struct pte_desc *pted)
 
 		tlbsync();
 		pmap_attr_save(ptp64->pte_lo & PTE_RPGN_64,
-		    ptp64->pte_lo & (PTE_REF_32|PTE_CHG_32));
+		    ptp64->pte_lo & (PTE_REF_64|PTE_CHG_64));
 	}
 
 	if (secondary)
@@ -2493,7 +2411,7 @@ pte_insert32(struct pte_desc *pted)
 		__asm volatile ("sync");
 		return;
 	}
-	/* first just try fill of secondary hash */
+	/* try fill of secondary hash */
 	ptp32 = pmap_ptable32 + (idx ^ pmap_ptab_mask) * 8;
 	for (i = 0; i < 8; i++) {
 		if (ptp32[i].pte_hi & PTE_VALID_32)
@@ -2716,13 +2634,14 @@ int pmap_show_mappings(paddr_t pa);
 int
 pmap_show_mappings(paddr_t pa) 
 {
-	struct pted_pv_head *pvh;
 	struct pte_desc *pted;
-	pvh = pmap_find_pvh(pa);
-	if (pvh == NULL) {
+	struct vm_page *pg;
+
+	pg = PHYS_TO_VM_PAGE(pa);
+	if (pg == NULL) {
 		db_printf("pa %x: unmanaged\n");
 	} else {
-		LIST_FOREACH(pted, pvh, pted_pv_list) {
+		LIST_FOREACH(pted, &(pg->mdpage.pv_list), pted_pv_list) {
 			pmap_print_pted(pted, db_printf);
 		}
 	}