[Xen-devel] [PATCH v2 03/23] x86: zero BSS using stosl instead of stosb

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

Additionally, align relevant comment to coding style.

Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
---
 xen/arch/x86/boot/head.S |    5 +++--
 xen/arch/x86/xen.lds.S   |    2 ++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S
index f63b349..ed42782 100644
--- a/xen/arch/x86/boot/head.S
+++ b/xen/arch/x86/boot/head.S
@@ -123,12 +123,13 @@ __start:
         call    reloc
         mov     %eax,sym_phys(multiboot_ptr)
 
-        /* Initialize BSS (no nasty surprises!) */
+        /* Initialize BSS (no nasty surprises!). */
         mov     $sym_phys(__bss_start),%edi
         mov     $sym_phys(__bss_end),%ecx
         sub     %edi,%ecx
+        shr     $2,%ecx
         xor     %eax,%eax
-        rep     stosb
+        rep     stosl
 
         /* Interrogate CPU extended features via CPUID. */
         mov     $0x80000000,%eax
diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 6553cff..3e1f2af 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -162,6 +162,7 @@ SECTIONS
   . = ALIGN(STACK_SIZE);
   __init_end = .;
 
+  . = ALIGN(4);
   .bss : {                     /* BSS */
        __bss_start = .;
        *(.bss.stack_aligned)
@@ -175,6 +176,7 @@ SECTIONS
        *(.bss.percpu.read_mostly)
        . = ALIGN(SMP_CACHE_BYTES);
        __per_cpu_data_end = .;
+       . = ALIGN(4);
        __bss_end = .;
   } :text
   _end = . ;
-- 
1.7.10.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel