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authorkogiidena <kogiidena@eggplant.ddo.jp>2006-01-16 22:14:10 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-16 23:15:27 -0800
commit9d44190eae97ad4c9ce30f1084e1b0dabd646df5 (patch)
treed4801a1f62ea7493b34c306a4ee685e0c4fa5f53 /arch/sh/kernel/relocate_kernel.S
parent0d831770b154a057562236e8cf50905c8f1ae1b0 (diff)
[PATCH] sh: kexec() support
This adds kexec() support for SH. Signed-off-by: kogiidena <kogiidena@eggplant.ddo.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org> Cc: <fastboot@lists.osdl.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/sh/kernel/relocate_kernel.S')
-rw-r--r--arch/sh/kernel/relocate_kernel.S102
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/sh/kernel/relocate_kernel.S b/arch/sh/kernel/relocate_kernel.S
new file mode 100644
index 00000000000..b0695cffec6
--- /dev/null
+++ b/arch/sh/kernel/relocate_kernel.S
@@ -0,0 +1,102 @@
+/*
+ * relocate_kernel.S - put the kernel image in place to boot
+ * 2005.9.17 kogiidena@eggplant.ddo.jp
+ *
+ * LANDISK/sh4 is supported. Maybe, SH archtecture works well.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+
+#define PAGE_SIZE 4096 /* must be same value as in <asm/page.h> */
+
+
+ .globl relocate_new_kernel
+relocate_new_kernel:
+ /* r4 = indirection_page */
+ /* r5 = reboot_code_buffer */
+ /* r6 = start_address */
+ /* r7 = vbr_reg */
+
+ mov.l 10f,r8 /* 4096 */
+ mov.l 11f,r9 /* 0xa0000000 */
+
+ /* stack setting */
+ add r8,r5
+ mov r5,r15
+
+ bra 1f
+ mov r4,r0 /* cmd = indirection_page */
+0:
+ mov.l @r4+,r0 /* cmd = *ind++ */
+
+1: /* addr = (cmd | 0xa0000000) & 0xfffffff0 */
+ mov r0,r2
+ or r9,r2
+ mov #-16,r1
+ and r1,r2
+
+ /* if(cmd & IND_DESTINATION) dst = addr */
+ tst #1,r0
+ bt 2f
+ bra 0b
+ mov r2,r5
+
+2: /* else if(cmd & IND_INDIRECTION) ind = addr */
+ tst #2,r0
+ bt 3f
+ bra 0b
+ mov r2,r4
+
+3: /* else if(cmd & IND_DONE) goto 6 */
+ tst #4,r0
+ bt 4f
+ bra 6f
+ nop
+
+4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */
+ tst #8,r0
+ bt 0b
+
+ mov r8,r3
+ shlr2 r3
+ shlr2 r3
+5:
+ dt r3
+ mov.l @r2+,r1 /* 16n+0 */
+ mov.l r1,@r5
+ add #4,r5
+ mov.l @r2+,r1 /* 16n+4 */
+ mov.l r1,@r5
+ add #4,r5
+ mov.l @r2+,r1 /* 16n+8 */
+ mov.l r1,@r5
+ add #4,r5
+ mov.l @r2+,r1 /* 16n+12 */
+ mov.l r1,@r5
+ add #4,r5
+ bf 5b
+
+ bra 0b
+ nop
+6:
+#ifdef CONFIG_SH_STANDARD_BIOS
+ ldc r7, vbr
+#endif
+ jmp @r6
+ nop
+
+ .align 2
+10:
+ .long PAGE_SIZE
+11:
+ .long 0xa0000000
+
+relocate_new_kernel_end:
+
+ .globl relocate_new_kernel_size
+relocate_new_kernel_size:
+ .long relocate_new_kernel_end - relocate_new_kernel