100 lines
1.7 KiB
ArmAsm
100 lines
1.7 KiB
ArmAsm
/*
|
|
* 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/linkage.h>
|
|
#include <asm/addrspace.h>
|
|
#include <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 /* PAGE_SIZE */
|
|
mov.l 11f,r9 /* P2SEG */
|
|
|
|
/* 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 | P2SEG) & 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 P2SEG
|
|
|
|
relocate_new_kernel_end:
|
|
|
|
.globl relocate_new_kernel_size
|
|
relocate_new_kernel_size:
|
|
.long relocate_new_kernel_end - relocate_new_kernel
|