linux-kernel - [PATCH 4/4] x86/xen: remove 32-bit awareness from startup

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Date:   Thu, 28 Oct 2021 10:12:21 +0200
From:   Juergen Gross <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 4/4] x86/xen: remove 32-bit awareness from startup_xen

startup_xen is still 32-bit aware, even if no longer needed.

Replace the register macros by the 64-bit register names for making
it more readable.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/xen/xen-head.S | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index cb6538ae2fe0..38b0a3226c95 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -28,13 +28,13 @@ SYM_CODE_START(startup_xen)
 
 	/* Clear .bss */
 	xor %eax,%eax
-	mov $__bss_start, %_ASM_DI
-	mov $__bss_stop, %_ASM_CX
-	sub %_ASM_DI, %_ASM_CX
-	shr $__ASM_SEL(2, 3), %_ASM_CX
-	rep __ASM_SIZE(stos)
+	mov $__bss_start, %rdi
+	mov $__bss_stop, %rcx
+	sub %rdi, %rcx
+	shr $3, %rcx
+	rep stosq
 
-	mov %_ASM_SI, xen_start_info
+	mov %rsi, xen_start_info
 	mov initial_stack(%rip), %rsp
 
 	/* Set up %gs.
-- 
2.26.2