b7cf6ddc13
Add kexec jump support to the SuperH architecture. Similar to the x86 implementation, with the following exceptions: - Instead of separating the assembly code flow into two parts for regular kexec and kexec jump we use a single code path. In the assembly snippet regular kexec is just kexec jump that never comes back. - Instead of using a swap page when moving data between pages the page copy assembly routine has been modified to exchange the data between the pages using registers. - We walk the page list twice in machine_kexec() to do and undo physical to virtual address conversion. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
232 lines
4.1 KiB
ArmAsm
232 lines
4.1 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.
|
|
*
|
|
* 2009-03-18 Magnus Damm - Added Kexec Jump support
|
|
*
|
|
* 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 */
|
|
|
|
mov.l 10f, r0 /* PAGE_SIZE */
|
|
add r5, r0 /* setup new stack at end of control page */
|
|
|
|
/* save r15->r8 to new stack */
|
|
mov.l r15, @-r0
|
|
mov r0, r15
|
|
mov.l r14, @-r15
|
|
mov.l r13, @-r15
|
|
mov.l r12, @-r15
|
|
mov.l r11, @-r15
|
|
mov.l r10, @-r15
|
|
mov.l r9, @-r15
|
|
mov.l r8, @-r15
|
|
|
|
/* save other random registers */
|
|
sts.l macl, @-r15
|
|
sts.l mach, @-r15
|
|
stc.l gbr, @-r15
|
|
stc.l ssr, @-r15
|
|
stc.l sr, @-r15
|
|
sts.l pr, @-r15
|
|
stc.l spc, @-r15
|
|
|
|
/* switch to bank1 and save r7->r0 */
|
|
mov.l 12f, r9
|
|
stc sr, r8
|
|
or r9, r8
|
|
ldc r8, sr
|
|
mov.l r7, @-r15
|
|
mov.l r6, @-r15
|
|
mov.l r5, @-r15
|
|
mov.l r4, @-r15
|
|
mov.l r3, @-r15
|
|
mov.l r2, @-r15
|
|
mov.l r1, @-r15
|
|
mov.l r0, @-r15
|
|
|
|
/* switch to bank0 and save r7->r0 */
|
|
mov.l 12f, r9
|
|
not r9, r9
|
|
stc sr, r8
|
|
and r9, r8
|
|
ldc r8, sr
|
|
mov.l r7, @-r15
|
|
mov.l r6, @-r15
|
|
mov.l r5, @-r15
|
|
mov.l r4, @-r15
|
|
mov.l r3, @-r15
|
|
mov.l r2, @-r15
|
|
mov.l r1, @-r15
|
|
mov.l r0, @-r15
|
|
|
|
mov.l r4, @-r15 /* save indirection page again */
|
|
|
|
bsr swap_pages /* swap pages before jumping to new kernel */
|
|
nop
|
|
|
|
mova 11f, r0
|
|
mov.l r15, @r0 /* save pointer to stack */
|
|
|
|
jsr @r6 /* hand over control to new kernel */
|
|
nop
|
|
|
|
mov.l 11f, r15 /* get pointer to stack */
|
|
mov.l @r15+, r4 /* restore r4 to get indirection page */
|
|
|
|
bsr swap_pages /* swap pages back to previous state */
|
|
nop
|
|
|
|
/* make sure bank0 is active and restore r0->r7 */
|
|
mov.l 12f, r9
|
|
not r9, r9
|
|
stc sr, r8
|
|
and r9, r8
|
|
ldc r8, sr
|
|
mov.l @r15+, r0
|
|
mov.l @r15+, r1
|
|
mov.l @r15+, r2
|
|
mov.l @r15+, r3
|
|
mov.l @r15+, r4
|
|
mov.l @r15+, r5
|
|
mov.l @r15+, r6
|
|
mov.l @r15+, r7
|
|
|
|
/* switch to bank1 and restore r0->r7 */
|
|
mov.l 12f, r9
|
|
stc sr, r8
|
|
or r9, r8
|
|
ldc r8, sr
|
|
mov.l @r15+, r0
|
|
mov.l @r15+, r1
|
|
mov.l @r15+, r2
|
|
mov.l @r15+, r3
|
|
mov.l @r15+, r4
|
|
mov.l @r15+, r5
|
|
mov.l @r15+, r6
|
|
mov.l @r15+, r7
|
|
|
|
/* switch back to bank0 */
|
|
mov.l 12f, r9
|
|
not r9, r9
|
|
stc sr, r8
|
|
and r9, r8
|
|
ldc r8, sr
|
|
|
|
/* restore other random registers */
|
|
ldc.l @r15+, spc
|
|
lds.l @r15+, pr
|
|
ldc.l @r15+, sr
|
|
ldc.l @r15+, ssr
|
|
ldc.l @r15+, gbr
|
|
lds.l @r15+, mach
|
|
lds.l @r15+, macl
|
|
|
|
/* restore r8->r15 */
|
|
mov.l @r15+, r8
|
|
mov.l @r15+, r9
|
|
mov.l @r15+, r10
|
|
mov.l @r15+, r11
|
|
mov.l @r15+, r12
|
|
mov.l @r15+, r13
|
|
mov.l @r15+, r14
|
|
mov.l @r15+, r15
|
|
rts
|
|
nop
|
|
|
|
swap_pages:
|
|
bra 1f
|
|
mov r4,r0 /* cmd = indirection_page */
|
|
0:
|
|
mov.l @r4+,r0 /* cmd = *ind++ */
|
|
|
|
1: /* addr = cmd & 0xfffffff0 */
|
|
mov r0,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) return */
|
|
tst #4,r0
|
|
bt 4f
|
|
rts
|
|
nop
|
|
|
|
4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */
|
|
tst #8,r0
|
|
bt 0b
|
|
|
|
mov.l 10f,r3 /* PAGE_SIZE */
|
|
shlr2 r3
|
|
shlr2 r3
|
|
5:
|
|
dt r3
|
|
|
|
/* regular kexec just overwrites the destination page
|
|
* with the contents of the source page.
|
|
* for the kexec jump case we need to swap the contents
|
|
* of the pages.
|
|
* to keep it simple swap the contents for both cases.
|
|
*/
|
|
mov.l @(0, r2), r8
|
|
mov.l @(0, r5), r1
|
|
mov.l r8, @(0, r5)
|
|
mov.l r1, @(0, r2)
|
|
|
|
mov.l @(4, r2), r8
|
|
mov.l @(4, r5), r1
|
|
mov.l r8, @(4, r5)
|
|
mov.l r1, @(4, r2)
|
|
|
|
mov.l @(8, r2), r8
|
|
mov.l @(8, r5), r1
|
|
mov.l r8, @(8, r5)
|
|
mov.l r1, @(8, r2)
|
|
|
|
mov.l @(12, r2), r8
|
|
mov.l @(12, r5), r1
|
|
mov.l r8, @(12, r5)
|
|
mov.l r1, @(12, r2)
|
|
|
|
add #16,r5
|
|
add #16,r2
|
|
bf 5b
|
|
|
|
bra 0b
|
|
nop
|
|
|
|
.align 2
|
|
10:
|
|
.long PAGE_SIZE
|
|
11:
|
|
.long 0
|
|
12:
|
|
.long 0x20000000 ! RB=1
|
|
|
|
relocate_new_kernel_end:
|
|
|
|
.globl relocate_new_kernel_size
|
|
relocate_new_kernel_size:
|
|
.long relocate_new_kernel_end - relocate_new_kernel
|