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* relocate_kernel.S - put the kernel image in place to boot
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* 2005.9.17 kogiidena@eggplant.ddo.jp
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* LANDISK/sh4 is supported. Maybe, SH archtecture works well.
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* 2009-03-18 Magnus Damm - Added Kexec Jump support
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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#include <linux/linkage.h>
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#include <asm/addrspace.h>
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.globl relocate_new_kernel
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/* r4 = indirection_page */
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/* r5 = reboot_code_buffer */
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/* r6 = start_address */
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mov.l 10f, r0 /* PAGE_SIZE */
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add r5, r0 /* setup new stack at end of control page */
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/* save r15->r8 to new stack */
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/* save other random registers */
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/* switch to bank1 and save r7->r0 */
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/* switch to bank0 and save r7->r0 */
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mov.l r4, @-r15 /* save indirection page again */
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bsr swap_pages /* swap pages before jumping to new kernel */
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mov.l r15, @r0 /* save pointer to stack */
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jsr @r6 /* hand over control to new kernel */
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mov.l 11f, r15 /* get pointer to stack */
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mov.l @r15+, r4 /* restore r4 to get indirection page */
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bsr swap_pages /* swap pages back to previous state */
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/* make sure bank0 is active and restore r0->r7 */
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/* switch to bank1 and restore r0->r7 */
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/* switch back to bank0 */
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/* restore other random registers */
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/* restore r8->r15 */
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mov r4,r0 /* cmd = indirection_page */
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mov.l @r4+,r0 /* cmd = *ind++ */
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1: /* addr = cmd & 0xfffffff0 */
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/* if(cmd & IND_DESTINATION) dst = addr */
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2: /* else if(cmd & IND_INDIRECTION) ind = addr */
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3: /* else if(cmd & IND_DONE) return */
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4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */
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mov.l 10f,r3 /* PAGE_SIZE */
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/* regular kexec just overwrites the destination page
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* with the contents of the source page.
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* for the kexec jump case we need to swap the contents
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* to keep it simple swap the contents for both cases.
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.long 0x20000000 ! RB=1
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relocate_new_kernel_end:
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.globl relocate_new_kernel_size
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relocate_new_kernel_size:
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.long relocate_new_kernel_end - relocate_new_kernel