This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / sh / kernel / relocate_kernel.S

diff --git a/arch/sh/kernel/relocate_kernel.S b/arch/sh/kernel/relocate_kernel.S
new file mode 100644 (file)
index 0000000..b0695cf
--- /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