From 83602303ba4e4c368d9b3e333a25a36047fe7828 Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Sat, 20 Aug 2016 21:04:18 +0000
Subject: [PATCH] Fix indentation.

---
 sys/arch/arm/arm/pmap7.c | 121 +++++++++++++++++++++++++++++----------
 1 file changed, 91 insertions(+), 30 deletions(-)

diff --git a/sys/arch/arm/arm/pmap7.c b/sys/arch/arm/arm/pmap7.c
index b1b35c068ed..066e17fc751 100644
--- a/sys/arch/arm/arm/pmap7.c
+++ b/sys/arch/arm/arm/pmap7.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap7.c,v 1.43 2016/08/20 12:36:59 kettenis Exp $	*/
+/*	$OpenBSD: pmap7.c,v 1.44 2016/08/20 21:04:18 kettenis Exp $	*/
 /*	$NetBSD: pmap.c,v 1.147 2004/01/18 13:03:50 scw Exp $	*/
 
 /*
@@ -1166,7 +1166,7 @@ pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
 			npte |= L2_V7_AF;
 
 			if ((flags & PROT_WRITE) ||
-			     (pg->mdpage.pvh_attrs & PVF_MOD)) {
+			    (pg->mdpage.pvh_attrs & PVF_MOD)) {
 				/*
 				 * This is a writable mapping, and the
 				 * page's mod state indicates it has
@@ -1702,6 +1702,7 @@ pmap_clear_reference(struct vm_page *pg)
 int
 pmap_fault_fixup(pmap_t pm, vaddr_t va, vm_prot_t ftype, int user)
 {
+#if 0
 	struct l2_dtable *l2;
 	struct l2_bucket *l2b;
 	pd_entry_t *pl1pd, l1pd;
@@ -1794,36 +1795,10 @@ pmap_fault_fixup(pmap_t pm, vaddr_t va, vm_prot_t ftype, int user)
 		*ptep = (pte & ~L2_V7_AP(0x4));
 		PTE_SYNC(ptep);
 		rv = 1;
-	} else if ((pte & L2_V7_AF) == 0) {
-		/*
-		 * This looks like a good candidate for "page referenced"
-		 * emulation.
-		 */
-		struct pv_entry *pv;
-		struct vm_page *pg;
-
-		/* Extract the physical address of the page */
-		if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL)
-			goto out;
-
-		/* Get the current flags for this page. */
-		pv = pmap_find_pv(pg, pm, va);
-		if (pv == NULL)
-			goto out;
-
-		pg->mdpage.pvh_attrs |= PVF_REF;
-		pv->pv_flags |= PVF_REF;
-		pte |= L2_V7_AF;
-
-		NPDEBUG(PDB_FOLLOW,
-		    printf("pmap_fault_fixup: ref emul. pm %p, va 0x%08lx, pa 0x%08lx\n",
-		    pm, va, pg->phys_addr));
-
-		*ptep = pte;
-		PTE_SYNC(ptep);
-		rv = 1;
 	} else {
+extern int last_fault_code;
 printf("%s: va %08lx ftype %x %c pte %08x\n", __func__, va, ftype, user ? 'u' : 's', pte);
+printf("fsr 0x%08x\n", last_fault_code);
 		goto out;
 	}
 
@@ -1846,6 +1821,92 @@ printf("%s: va %08lx ftype %x %c pte %08x\n", __func__, va, ftype, user ? 'u' :
 
 out:
 	return (rv);
+#else
+	return 0;
+#endif
+}
+
+/*
+ * dab_access() handles the following data aborts:
+ *
+ *  Access flag fault -- Level 1
+ *  Access flag fault -- Level 2
+ *
+ * Set the Access Flag and mark the page as referenced.
+ */
+int
+dab_access(trapframe_t *tf, u_int fsr, u_int far, struct proc *p)
+{
+	struct pmap *pm = p->p_vmspace->vm_map.pmap;
+	vaddr_t va = trunc_page(far);
+	struct l2_dtable *l2;
+	struct l2_bucket *l2b;
+	pt_entry_t *ptep, pte;
+	struct pv_entry *pv;
+	struct vm_page *pg;
+	paddr_t pa;
+	u_int l1idx;
+
+	l1idx = L1_IDX(va);
+
+	/*
+	 * If there is no l2_dtable for this address, then the process
+	 * has no business accessing it.
+	 */
+	l2 = pm->pm_l2[L2_IDX(l1idx)];
+	if (l2 == NULL) {
+		printf("l2\n");
+		return 1;
+	}
+
+	/*
+	 * Likewise if there is no L2 descriptor table
+	 */
+	l2b = &l2->l2_bucket[L2_BUCKET(l1idx)];
+	if (l2b->l2b_kva == NULL) {
+		printf("l2b\n");
+		return 1;
+	}
+
+	/*
+	 * Check the PTE itself.
+	 */
+	ptep = &l2b->l2b_kva[l2pte_index(va)];
+	pte = *ptep;
+	if (pte == L2_TYPE_INV) {
+		printf("pte\n");
+		return 1;
+	}
+
+	pa = l2pte_pa(pte);
+
+	/*
+	 * Perform page referenced emulation.
+	 */
+	KASSERT((pte & L2_V7_AF) == 0);
+
+	/* Extract the physical address of the page */
+	if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) {
+		printf("pg va 0x%08lx pa 0x%08lx pte 0x%08x\n", va, pa, pte);
+		printf("fsr 0x%08x far 0x%08x\n", fsr, far);
+		Debugger();
+		return 1;
+	}
+
+	/* Get the current flags for this page. */
+	pv = pmap_find_pv(pg, pm, va);
+	if (pv == NULL) {
+		printf("pv\n");
+		return 1;
+	}
+
+	pg->mdpage.pvh_attrs |= PVF_REF;
+	pv->pv_flags |= PVF_REF;
+	pte |= L2_V7_AF;
+
+	*ptep = pte;
+	PTE_SYNC(ptep);
+	return 0;
 }
 
 /*
-- 
2.20.1