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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm/boot/bootp/init.S
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm/boot/bootp/init.S')
-rw-r--r--kernel/arch/arm/boot/bootp/init.S88
1 files changed, 88 insertions, 0 deletions
diff --git a/kernel/arch/arm/boot/bootp/init.S b/kernel/arch/arm/boot/bootp/init.S
new file mode 100644
index 000000000..78b508075
--- /dev/null
+++ b/kernel/arch/arm/boot/bootp/init.S
@@ -0,0 +1,88 @@
+/*
+ * linux/arch/arm/boot/bootp/init.S
+ *
+ * Copyright (C) 2000-2003 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * "Header" file for splitting kernel + initrd. Note that we pass
+ * r0 through to r3 straight through.
+ *
+ * This demonstrates how to append code to the start of the kernel
+ * zImage, and boot the kernel without copying it around. This
+ * example would be simpler; if we didn't have an object of unknown
+ * size immediately following the kernel, we could build this into
+ * a binary blob, and concatenate the zImage using the cat command.
+ */
+ .section .start,#alloc,#execinstr
+ .type _start, #function
+ .globl _start
+
+_start: add lr, pc, #-0x8 @ lr = current load addr
+ adr r13, data
+ ldmia r13!, {r4-r6} @ r5 = dest, r6 = length
+ add r4, r4, lr @ r4 = initrd_start + load addr
+ bl move @ move the initrd
+
+/*
+ * Setup the initrd parameters to pass to the kernel. This can only be
+ * passed in via the tagged list.
+ */
+ ldmia r13, {r5-r9} @ get size and addr of initrd
+ @ r5 = ATAG_CORE
+ @ r6 = ATAG_INITRD2
+ @ r7 = initrd start
+ @ r8 = initrd end
+ @ r9 = param_struct address
+
+ ldr r10, [r9, #4] @ get first tag
+ teq r10, r5 @ is it ATAG_CORE?
+/*
+ * If we didn't find a valid tag list, create a dummy ATAG_CORE entry.
+ */
+ movne r10, #0 @ terminator
+ movne r4, #2 @ Size of this entry (2 words)
+ stmneia r9, {r4, r5, r10} @ Size, ATAG_CORE, terminator
+
+/*
+ * find the end of the tag list, and then add an INITRD tag on the end.
+ * If there is already an INITRD tag, then we ignore it; the last INITRD
+ * tag takes precedence.
+ */
+taglist: ldr r10, [r9, #0] @ tag length
+ teq r10, #0 @ last tag (zero length)?
+ addne r9, r9, r10, lsl #2
+ bne taglist
+
+ mov r5, #4 @ Size of initrd tag (4 words)
+ stmia r9, {r5, r6, r7, r8, r10}
+ b kernel_start @ call kernel
+
+/*
+ * Move the block of memory length r6 from address r4 to address r5
+ */
+move: ldmia r4!, {r7 - r10} @ move 32-bytes at a time
+ stmia r5!, {r7 - r10}
+ ldmia r4!, {r7 - r10}
+ stmia r5!, {r7 - r10}
+ subs r6, r6, #8 * 4
+ bcs move
+ mov pc, lr
+
+ .size _start, . - _start
+
+ .align
+
+ .type data,#object
+data: .word initrd_start @ source initrd address
+ .word initrd_phys @ destination initrd address
+ .word initrd_size @ initrd size
+
+ .word 0x54410001 @ r5 = ATAG_CORE
+ .word 0x54420005 @ r6 = ATAG_INITRD2
+ .word initrd_phys @ r7
+ .word initrd_size @ r8
+ .word params_phys @ r9
+ .size data, . - data