[PATCH v6 13/27] x86: use rsi/rdi to pass realmode_data pointer

[Yinghai Lu]

When 64bit bootloader put real mode data above 4g, pointer will be
64bit instead of 32bit

use rsi/rdi instead of esi/edi for real_data pointer passing
between asm code and c code.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
 arch/x86/kernel/head_64.S |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 7d13874..4630d20 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -409,9 +409,9 @@ ENTRY(secondary_startup_64)
 	movl	initial_gs+4(%rip),%edx
 	wrmsr	
 
-	/* esi is pointer to real mode structure with interesting info.
+	/* rsi is pointer to real mode structure with interesting info.
 	   pass it to C */
-	movl	%esi, %edi
+	movq	%rsi, %rdi
 	
 	/* Finally jump to run C code and to be on real kernel address
 	 * Since we are running on identity-mapped space we have to jump
-- 
1.7.10.4

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