[src/trunk]: src/sys/arch/mips/mips Move exc_step definition under MIPS64_OCT...

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

details:   https://anonhg.NetBSD.org/src/rev/a81e6588def3
branches:  trunk
changeset: 936157:a81e6588def3
user:      skrll <skrll%NetBSD.org@localhost>
date:      Mon Jul 20 10:53:47 2020 +0000

description:
Move exc_step definition under MIPS64_OCTEON and use it in the zeroising
memset as length for correctness.

diffstat:

 sys/arch/mips/mips/cpu_subr.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (38 lines):

diff -r 8476405a65e0 -r a81e6588def3 sys/arch/mips/mips/cpu_subr.c
--- a/sys/arch/mips/mips/cpu_subr.c     Mon Jul 20 06:47:02 2020 +0000
+++ b/sys/arch/mips/mips/cpu_subr.c     Mon Jul 20 10:53:47 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cpu_subr.c,v 1.51 2020/07/20 03:26:07 simonb Exp $     */
+/*     $NetBSD: cpu_subr.c,v 1.52 2020/07/20 10:53:47 skrll Exp $      */
 
 /*-
  * Copyright (c) 2010, 2019 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpu_subr.c,v 1.51 2020/07/20 03:26:07 simonb Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpu_subr.c,v 1.52 2020/07/20 10:53:47 skrll Exp $");
 
 #include "opt_cputype.h"
 #include "opt_ddb.h"
@@ -122,17 +122,17 @@
 cpu_info_alloc(struct pmap_tlb_info *ti, cpuid_t cpu_id, cpuid_t cpu_package_id,
        cpuid_t cpu_core_id, cpuid_t cpu_smt_id)
 {
-       const int exc_step = 1 << MIPS_EBASE_EXC_BASE_SHIFT;
 
        KASSERT(cpu_id < MAXCPUS);
 
 #ifdef MIPS64_OCTEON
+       const int exc_step = 1 << MIPS_EBASE_EXC_BASE_SHIFT;
        vaddr_t exc_page = MIPS_UTLB_MISS_EXC_VEC + exc_step * cpu_id;
        __CTASSERT(sizeof(struct cpu_info) + sizeof(struct pmap_tlb_info)
            <= exc_step - 0x280);
 
        struct cpu_info * const ci = ((struct cpu_info *)(exc_page + exc_step)) - 1;
-       memset((void *)exc_page, 0, PAGE_SIZE);
+       memset((void *)exc_page, 0, exc_step);
 
        if (ti == NULL) {
                ti = ((struct pmap_tlb_info *)ci) - 1;