From 0079179f054ea9c5e2c091311e5220ab10816989 Mon Sep 17 00:00:00 2001
From: Alexander Boettcher <alexander.boettcher@genode-labs.com>
Date: Wed, 10 Jul 2013 14:34:20 +0200
Subject: [PATCH] base: store initial ax and di registers in crt0.s

The values are used by a follow up commit by nova to get the boot CPU number.

Issue #814
---
 base/src/platform/x86_32/crt0.s |  8 +++++++-
 base/src/platform/x86_64/crt0.s | 12 +++++++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/base/src/platform/x86_32/crt0.s b/base/src/platform/x86_32/crt0.s
index 2952f173e..47afb98b0 100644
--- a/base/src/platform/x86_32/crt0.s
+++ b/base/src/platform/x86_32/crt0.s
@@ -17,6 +17,8 @@
 
 _start:
 	mov %esp, __initial_sp
+	mov %eax, __initial_ax
+	mov %edi, __initial_di
 
 	/* XXX Switch to our own stack.  */
 	leal _stack_high, %esp
@@ -52,6 +54,10 @@ _stack_low:
 	.global	_stack_high
 _stack_high:
 
-	/* initial value of the ESP register */
+	/* initial value of the ESP, EAX and EDI register */
 	.globl	__initial_sp
+	.globl	__initial_ax
+	.globl	__initial_di
 __initial_sp: .space 4
+__initial_ax: .space 4
+__initial_di: .space 4
diff --git a/base/src/platform/x86_64/crt0.s b/base/src/platform/x86_64/crt0.s
index 4d1edc74a..898faa6c9 100644
--- a/base/src/platform/x86_64/crt0.s
+++ b/base/src/platform/x86_64/crt0.s
@@ -17,6 +17,12 @@
 
 _start:
 
+	movq __initial_ax@GOTPCREL(%rip), %rbx
+	movq %rax, (%rbx)
+
+	movq __initial_di@GOTPCREL(%rip), %rbx
+	movq %rdi, (%rbx)
+
 	movq __initial_sp@GOTPCREL(%rip), %rax
 	movq %rsp, (%rax)
 
@@ -55,6 +61,10 @@ _stack_low:
 	.global	_stack_high
 _stack_high:
 
-	/* initial value of the RSP register */
+	/* initial value of the RSP, RAX and RDI register */
 	.globl	__initial_sp
+	.globl	__initial_ax
+	.globl	__initial_di
 __initial_sp: .space 8
+__initial_ax: .space 8
+__initial_di: .space 8