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@suse.com>
Link: https://lore.kernel.org/r/20211028081221.2475-5-jgross@suse.com
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 9e27b86..6a64496 100644 (file)
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -45,13 +45,13 @@ 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.