[deliverable/linux.git] / arch / mips / kernel / relocate_kernel.S

/*
 * 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
Commit	Line	Data
583bb86f NS	1	/*
	2	* relocate_kernel.S for kexec
	3	* Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006
	4	*
	5	* This source code is licensed under the GNU General Public License,
	6	* Version 2. See the file COPYING for more details.
	7	*/
	8
	9	#include <asm/asm.h>
	10	#include <asm/asmmacro.h>
	11	#include <asm/regdef.h>
	12	#include <asm/page.h>
	13	#include <asm/mipsregs.h>
	14	#include <asm/stackframe.h>
	15	#include <asm/addrspace.h>
	16
00be0f30 RB	17	LEAF(relocate_new_kernel)
	18	PTR_L s0, kexec_indirection_page
	19	PTR_L s1, kexec_start_address
583bb86f NS	20
583bb86f NS	21	process_entry:
00be0f30 RB	22	PTR_L s2, (s0)
00be0f30 RB	23	PTR_ADD s0, s0, SZREG
583bb86f NS	24
583bb86f NS	25	/* destination page */
00be0f30 RB	26	and s3, s2, 0x1
	27	beq s3, zero, 1f
	28	and s4, s2, ~0x1 /* store destination addr in s4 */
	29	move a0, s4
	30	b process_entry
583bb86f NS	31
	32	1:
	33	/* indirection page, update s0 */
00be0f30 RB	34	and s3, s2, 0x2
	35	beq s3, zero, 1f
	36	and s0, s2, ~0x2
	37	b process_entry
583bb86f NS	38
	39	1:
	40	/* done page */
00be0f30 RB	41	and s3, s2, 0x4
	42	beq s3, zero, 1f
	43	b done
583bb86f NS	44	1:
583bb86f NS	45	/* source page */
00be0f30 RB	46	and s3, s2, 0x8
	47	beq s3, zero, process_entry
	48	and s2, s2, ~0x8
	49	li s6, (1 << PAGE_SHIFT) / SZREG
583bb86f NS	50
	51	copy_word:
	52	/* copy page word by word */
00be0f30 RB	53	REG_L s5, (s2)
	54	REG_S s5, (s4)
	55	PTR_ADD s4, s4, SZREG
	56	PTR_ADD s2, s2, SZREG
	57	LONG_SUB s6, s6, 1
	58	beq s6, zero, process_entry
	59	b copy_word
	60	b process_entry
583bb86f NS	61
	62	done:
	63	/* jump to kexec_start_address */
00be0f30 RB	64	j s1
00be0f30 RB	65	END(relocate_new_kernel)
583bb86f	66
583bb86f	67	kexec_start_address:
00be0f30 RB	68	EXPORT(kexec_start_address)
	69	PTR 0x0
	70	.size kexec_start_address, PTRSIZE
583bb86f	71
583bb86f	72	kexec_indirection_page:
00be0f30 RB	73	EXPORT(kexec_indirection_page)
	74	PTR 0
	75	.size kexec_indirection_page, PTRSIZE
583bb86f NS	76
	77	relocate_new_kernel_end:
	78
583bb86f	79	relocate_new_kernel_size:
00be0f30 RB	80	EXPORT(relocate_new_kernel_size)
	81	PTR relocate_new_kernel_end - relocate_new_kernel
	82	.size relocate_new_kernel_size, PTRSIZE