upload android base code part4

android/hardware/intel/bootstub/head.S

@@ -0,0 +1,87 @@
+/*
+ * head.S for bootstub to load protected mode kernel
+ *
+ * Copyright (C) 2008-2010 Intel Corporation.
+ * Author: Alek Du <alek.du@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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., 
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+/*
+ *
+ * Note. When FW hand-off control to bootstub, the CPU is already in protected
+ * Mode with 1. GDT(8)=4G GDT(10)=4G
+ *           2. CS=8, DS=ES=FS=GS=10
+ *           3. Paging mode disabled
+ *           4. Interrupt ENABLED
+ *
+ * When bootstub get control, the memory map in DRAM is like:
+ *		~			~
+ * 0x1102000	|	initrd		| initrd will move to highest memory otherwise 
+ *+bzImage size +-----------------------+ bzImage uncompressing will destory it
+ *		|	bzImage		|
+ * 0x1102000	+-----------------------+
+ *		|	boot stub	|
+ * 0x1101000	+-----------------------+
+ *		|	free space	|
+ *		|	used as stack	|
+ * 0x1100110	+-----------------------+
+ *		|	SPI0 or SPI1	| MIC need to fill it:
+ *		|			| 0x0: SPI0, 0x1: SPI1
+ * 0x110010c	+-----------------------+
+ *		|   boot stub spi uart	| MIC need to fill it:
+ *		|   suppression flag	| 0x1 suppression, 0x0 default
+ * 0x1100108	+-----------------------+
+ *		|	initrd size	| MIC need to fill it: initrd file size
+ * 0x1100104	+-----------------------+
+ *		|	bzImage size	| MIC need to fill it: bzImage file size
+ * 0x1100100	+-----------------------+
+ *		|	kernel cmdline	| MIC need to fill it
+ * 0x1100000	+-----------------------+
+*/
+
+#include "bootstub.h"
+
+.text
+
+.section ".text.head","ax",@progbits
+	.globl _start
+
+_start:
+	cld
+	cli
+	/* setup stack, because we are heading off to "C" */
+	movl $STACK_OFFSET, %esp
+	calll bootstub
+	/* after call bootstub, GDT is set, IDT is clear
+	* eax contains 32-bit entry of bzImage
+	*/
+	movl $__BOOT_DS, %ebx	
+	movl %ebx, %ds
+	movl %ebx, %es
+	movl %ebx, %fs
+	movl %ebx, %gs
+	movl %ebx, %ss
+	ljmp $__BOOT_CS,$1f
+1:
+	/* tell kernel where is boot_param */
+	movl $(BOOT_PARAMS_OFFSET), %esi
+	xor %ebp, %ebp
+	xor %edi, %edi
+	mov %eax, %ecx
+	mov mb_magic, %eax
+	mov mb_info, %ebx
+
+	jmpl *%ecx    # Jump to the 32-bit entrypoint