[RFC 1/3] MIPS: introduce C architecture-specific low-level init

[Antony Pavlov <antonynpavlov@gmail.com>]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/mips/boot/Makefile     |    1 +
 arch/mips/boot/main_entry.c |   45 +++++++++++++++++++++++++++++++++++++++++++
 arch/mips/boot/start.S      |   14 ++------------
 3 files changed, 48 insertions(+), 12 deletions(-)
 create mode 100644 arch/mips/boot/main_entry.c

diff --git a/arch/mips/boot/Makefile b/arch/mips/boot/Makefile
index f9151d2..d6d28ce 100644
--- a/arch/mips/boot/Makefile
+++ b/arch/mips/boot/Makefile
@@ -1 +1,2 @@
 obj-y += start.o
+obj-y += main_entry.o
diff --git a/arch/mips/boot/main_entry.c b/arch/mips/boot/main_entry.c
new file mode 100644
index 0000000..fa072de
--- /dev/null
+++ b/arch/mips/boot/main_entry.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2009 Juergen Beisert, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+/**
+ * @file
+ * @brief Start of the 32 bit flat mode
+ */
+
+#include <common.h>
+#include <string.h>
+#include <asm/sections.h>
+
+extern void start_barebox(void);
+
+void main_entry(void);
+
+/**
+ * Called plainly from assembler that switches from real to flat mode
+ *
+ * @note The C environment isn't initialized yet
+ */
+void main_entry(void)
+{
+	/* clear the BSS first */
+	memset(__bss_start, 0x00, __bss_stop - __bss_start);
+
+	start_barebox();
+}
diff --git a/arch/mips/boot/start.S b/arch/mips/boot/start.S
index e8868e1..dd302fc 100644
--- a/arch/mips/boot/start.S
+++ b/arch/mips/boot/start.S
@@ -79,7 +79,7 @@ __start:
 
 	la	a1, _start	/* link (RAM) _start address */
 
-	beq	a0, a1, clear_bss
+	beq	a0, a1, stack_setup
 	 nop
 
 	la	t0, _start
@@ -105,16 +105,6 @@ copy_loop:
 	blez		t3, copy_loop
 	addi		a1, LONGSIZE * 4
 
-clear_bss:
-	la	t0, __bss_start
-	sw	zero, (t0)
-	la	t1, _end - 4
-1:
-	addiu	t0, LONGSIZE
-	sw	zero, (t0)
-	bne	t0, t1, 1b
-	 nop
-
 	/*
 	 * Dominic Sweetman, See MIPS Run, Morgan Kaufmann, 2nd edition, 2006
 	 *
@@ -144,7 +134,7 @@ stack_setup:
 	/* reserve four 32-bit argument slots */
 	addiu	sp, -16
 
-	la	v0, start_barebox
+	la	v0, main_entry
 	jal     v0
 	 nop
 
-- 
1.7.10


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