relocate_kernel.S
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/*
* relocate_kernel.S for kexec
* Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/regdef.h>
#include <asm/page.h>
#include <asm/mipsregs.h>
#include <asm/stackframe.h>
#include <asm/addrspace.h>
LEAF(relocate_new_kernel)
PTR_L s0, kexec_indirection_page
PTR_L s1, kexec_start_address
process_entry:
PTR_L s2, (s0)
PTR_ADD s0, s0, SZREG
/* destination page */
and s3, s2, 0x1
beq s3, zero, 1f
and s4, s2, ~0x1 /* store destination addr in s4 */
move a0, s4
b process_entry
1:
/* indirection page, update s0 */
and s3, s2, 0x2
beq s3, zero, 1f
and s0, s2, ~0x2
b process_entry
1:
/* done page */
and s3, s2, 0x4
beq s3, zero, 1f
b done
1:
/* source page */
and s3, s2, 0x8
beq s3, zero, process_entry
and s2, s2, ~0x8
li s6, (1 << PAGE_SHIFT) / SZREG
copy_word:
/* copy page word by word */
REG_L s5, (s2)
REG_S s5, (s4)
PTR_ADD s4, s4, SZREG
PTR_ADD s2, s2, SZREG
LONG_SUB s6, s6, 1
beq s6, zero, process_entry
b copy_word
b process_entry
done:
/* jump to kexec_start_address */
j s1
END(relocate_new_kernel)
kexec_start_address:
EXPORT(kexec_start_address)
PTR 0x0
.size kexec_start_address, PTRSIZE
kexec_indirection_page:
EXPORT(kexec_indirection_page)
PTR 0
.size kexec_indirection_page, PTRSIZE
relocate_new_kernel_end:
relocate_new_kernel_size:
EXPORT(relocate_new_kernel_size)
PTR relocate_new_kernel_end - relocate_new_kernel
.size relocate_new_kernel_size, PTRSIZE