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| /* SPDX-License-Identifier: GPL-2.0
| *
| * 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
| */
| #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
|
|
