[src/trunk]: src/sys/arch/aarch64/aarch64 Bss clearing is now done at the beg...

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

details:   https://anonhg.NetBSD.org/src/rev/3d7f2a6a5631
branches:  trunk
changeset: 369602:3d7f2a6a5631
user:      ryo <ryo%NetBSD.org@localhost>
date:      Tue Aug 23 05:31:12 2022 +0000

description:
Bss clearing is now done at the beginning of start.S.

Some `__attribute__((__section__(".data")))' hack will no longer be needed.

diffstat:

 sys/arch/aarch64/aarch64/locore.S |  18 ++----------------
 sys/arch/aarch64/aarch64/start.S  |  17 +++++++++++++++--
 2 files changed, 17 insertions(+), 18 deletions(-)

diffs (84 lines):

diff -r 0e2885746a60 -r 3d7f2a6a5631 sys/arch/aarch64/aarch64/locore.S
--- a/sys/arch/aarch64/aarch64/locore.S Tue Aug 23 05:29:44 2022 +0000
+++ b/sys/arch/aarch64/aarch64/locore.S Tue Aug 23 05:31:12 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.S,v 1.86 2022/05/06 06:09:50 ryo Exp $  */
+/*     $NetBSD: locore.S,v 1.87 2022/08/23 05:31:12 ryo Exp $  */
 
 /*
  * Copyright (c) 2017 Ryo Shimizu <ryo%nerv.org@localhost>
@@ -38,7 +38,7 @@
 #include <aarch64/hypervisor.h>
 #include "assym.h"
 
-RCSID("$NetBSD: locore.S,v 1.86 2022/05/06 06:09:50 ryo Exp $")
+RCSID("$NetBSD: locore.S,v 1.87 2022/08/23 05:31:12 ryo Exp $")
 
 #ifdef AARCH64_DEVICE_MEM_STRONGLY_ORDERED
 #define        MAIR_DEVICE_MEM         MAIR_DEVICE_nGnRnE
@@ -93,8 +93,6 @@
        adrl    x0, bootstk
        mov     sp, x0
 
-       bl      clear_bss
-
        PRINT("boot NetBSD/aarch64\n")
 
        bl      1f
@@ -238,18 +236,6 @@
        .align 2
 
 
-ASENTRY_NP(clear_bss)
-       /* Zero the BSS. The size must be aligned 16, usually it should be. */
-       adrl    x14, __bss_start__
-       adrl    x15, __bss_end__
-       b       2f
-1:     stp     xzr, xzr, [x14], #16
-2:     cmp     x14, x15
-       b.lo    1b
-       ret
-ASEND(clear_bss)
-
-
 init_sysregs:
        stp     x0, lr, [sp, #-16]!
 
diff -r 0e2885746a60 -r 3d7f2a6a5631 sys/arch/aarch64/aarch64/start.S
--- a/sys/arch/aarch64/aarch64/start.S  Tue Aug 23 05:29:44 2022 +0000
+++ b/sys/arch/aarch64/aarch64/start.S  Tue Aug 23 05:31:12 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: start.S,v 1.12 2022/08/23 05:29:44 ryo Exp $   */
+/*     $NetBSD: start.S,v 1.13 2022/08/23 05:31:12 ryo Exp $   */
 
 /*
  * Copyright (c) 2017 Ryo Shimizu <ryo%nerv.org@localhost>
@@ -33,7 +33,7 @@
 #include <aarch64/asm.h>
 #include "assym.h"
 
-RCSID("$NetBSD: start.S,v 1.12 2022/08/23 05:29:44 ryo Exp $")
+RCSID("$NetBSD: start.S,v 1.13 2022/08/23 05:31:12 ryo Exp $")
 
 /*
  * Padding at start of kernel image to make room for 64-byte header
@@ -81,6 +81,19 @@
        br      x9
 9:
 
+
+       /*
+        * Zero the BSS
+        */
+       adrl    x8, __bss_start__
+       adrl    x9, __bss_end__
+       /* while (x8 < x9) *(uint128_t *)x8++ = 0; */
+       b       2f
+1:     stp     xzr, xzr, [x8], #16
+2:     cmp     x8, x9
+       b.lo    1b
+
+
        mrs     x8, CurrentEL
        lsr     x8, x8, #2
        cmp     x8, #0x2