[src/trunk]: src/sys/arch/aarch64/aarch64 Fix the use of the contiguous bit b...

[skrll <skrll%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3c1259611914
branches:  trunk
changeset: 945758:3c1259611914
user:      skrll <skrll%NetBSD.org@localhost>
date:      Sat Nov 07 08:48:11 2020 +0000

description:
Fix the use of the contiguous bit by checking the output address as well.

diffstat:

 sys/arch/aarch64/aarch64/pmapboot.c |  24 +++++++++++++++---------
 1 files changed, 15 insertions(+), 9 deletions(-)

diffs (80 lines):

diff -r fa1af202fbdf -r 3c1259611914 sys/arch/aarch64/aarch64/pmapboot.c
--- a/sys/arch/aarch64/aarch64/pmapboot.c       Sat Nov 07 08:33:50 2020 +0000
+++ b/sys/arch/aarch64/aarch64/pmapboot.c       Sat Nov 07 08:48:11 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmapboot.c,v 1.10 2020/07/17 07:21:44 ryo Exp $        */
+/*     $NetBSD: pmapboot.c,v 1.11 2020/11/07 08:48:11 skrll Exp $      */
 
 /*
  * Copyright (c) 2018 Ryo Shimizu <ryo%nerv.org@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmapboot.c,v 1.10 2020/07/17 07:21:44 ryo Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmapboot.c,v 1.11 2020/11/07 08:48:11 skrll Exp $");
 
 #include "opt_arm_debug.h"
 #include "opt_ddb.h"
@@ -46,7 +46,6 @@
 #include <aarch64/pmap.h>
 #include <aarch64/pte.h>
 
-
 #define OPTIMIZE_TLB_CONTIG
 
 static void
@@ -180,16 +179,23 @@
 
 #ifdef OPTIMIZE_TLB_CONTIG
 static inline bool
-tlb_contiguous_p(vaddr_t addr, vaddr_t start, vaddr_t end, vsize_t blocksize)
+tlb_contiguous_p(vaddr_t va, paddr_t pa, vaddr_t start, vaddr_t end,
+    vsize_t blocksize)
 {
        /*
         * when using 4KB granule, 16 adjacent and aligned entries can be
         * unified to one TLB cache entry.
         * in other size of granule, not supported.
         */
-       if (((addr & ~((blocksize << 4) - 1)) >= start) &&
-           ((addr | ((blocksize << 4) - 1)) <= end))
+       const vaddr_t mask = (blocksize << 4) - 1;
+
+       /* if the output address doesn't align it can't be contiguous */
+       if ((va & mask) != (pa & mask))
+               return false;
+
+       if ((va & ~mask) >= start && (va | mask) <= end)
                return true;
+
        return false;
 }
 #endif /* OPTIMIZE_TLB_CONTIG */
@@ -288,7 +294,7 @@
 #endif
                            attr;
 #ifdef OPTIMIZE_TLB_CONTIG
-                       if (tlb_contiguous_p(va, va_start, va_end, blocksize))
+                       if (tlb_contiguous_p(va, pa, va_start, va_end, blocksize))
                                pte |= LX_BLKPAG_CONTIG;
                        ll = l1;
                        llidx = idx1;
@@ -333,7 +339,7 @@
 #endif
                            attr;
 #ifdef OPTIMIZE_TLB_CONTIG
-                       if (tlb_contiguous_p(va, va_start, va_end, blocksize))
+                       if (tlb_contiguous_p(va, pa, va_start, va_end, blocksize))
                                pte |= LX_BLKPAG_CONTIG;
                        ll = l2;
                        llidx = idx2;
@@ -377,7 +383,7 @@
 #endif
                    attr;
 #ifdef OPTIMIZE_TLB_CONTIG
-               if (tlb_contiguous_p(va, va_start, va_end, blocksize))
+               if (tlb_contiguous_p(va, pa, va_start, va_end, blocksize))
                        pte |= LX_BLKPAG_CONTIG;
                ll = l3;
                llidx = idx3;