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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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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>
233 lines
4.1 KiB
ArmAsm
233 lines
4.1 KiB
ArmAsm
/*
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* relocate_kernel.S - put the kernel image in place to boot
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* 2005.9.17 kogiidena@eggplant.ddo.jp
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*
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* LANDISK/sh4 is supported. Maybe, SH archtecture works well.
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*
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* 2009-03-18 Magnus Damm - Added Kexec Jump support
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/linkage.h>
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#include <asm/addrspace.h>
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#include <asm/page.h>
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.globl relocate_new_kernel
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relocate_new_kernel:
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/* r4 = indirection_page */
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/* r5 = reboot_code_buffer */
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/* r6 = start_address */
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mov.l 10f, r0 /* PAGE_SIZE */
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add r5, r0 /* setup new stack at end of control page */
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/* save r15->r8 to new stack */
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mov.l r15, @-r0
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mov r0, r15
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mov.l r14, @-r15
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mov.l r13, @-r15
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mov.l r12, @-r15
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mov.l r11, @-r15
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mov.l r10, @-r15
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mov.l r9, @-r15
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mov.l r8, @-r15
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/* save other random registers */
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sts.l macl, @-r15
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sts.l mach, @-r15
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stc.l gbr, @-r15
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stc.l ssr, @-r15
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stc.l sr, @-r15
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sts.l pr, @-r15
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stc.l spc, @-r15
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/* switch to bank1 and save r7->r0 */
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mov.l 12f, r9
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stc sr, r8
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or r9, r8
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ldc r8, sr
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mov.l r7, @-r15
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mov.l r6, @-r15
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mov.l r5, @-r15
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mov.l r4, @-r15
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mov.l r3, @-r15
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mov.l r2, @-r15
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mov.l r1, @-r15
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mov.l r0, @-r15
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/* switch to bank0 and save r7->r0 */
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mov.l 12f, r9
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not r9, r9
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stc sr, r8
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and r9, r8
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ldc r8, sr
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mov.l r7, @-r15
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mov.l r6, @-r15
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mov.l r5, @-r15
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mov.l r4, @-r15
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mov.l r3, @-r15
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mov.l r2, @-r15
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mov.l r1, @-r15
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mov.l r0, @-r15
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mov.l r4, @-r15 /* save indirection page again */
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bsr swap_pages /* swap pages before jumping to new kernel */
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nop
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mova 11f, r0
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mov.l r15, @r0 /* save pointer to stack */
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jsr @r6 /* hand over control to new kernel */
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nop
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mov.l 11f, r15 /* get pointer to stack */
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mov.l @r15+, r4 /* restore r4 to get indirection page */
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bsr swap_pages /* swap pages back to previous state */
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nop
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/* make sure bank0 is active and restore r0->r7 */
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mov.l 12f, r9
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not r9, r9
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stc sr, r8
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and r9, r8
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ldc r8, sr
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mov.l @r15+, r0
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mov.l @r15+, r1
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mov.l @r15+, r2
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mov.l @r15+, r3
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mov.l @r15+, r4
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mov.l @r15+, r5
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mov.l @r15+, r6
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mov.l @r15+, r7
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/* switch to bank1 and restore r0->r7 */
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mov.l 12f, r9
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stc sr, r8
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or r9, r8
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ldc r8, sr
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mov.l @r15+, r0
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mov.l @r15+, r1
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mov.l @r15+, r2
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mov.l @r15+, r3
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mov.l @r15+, r4
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mov.l @r15+, r5
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mov.l @r15+, r6
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mov.l @r15+, r7
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/* switch back to bank0 */
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mov.l 12f, r9
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not r9, r9
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stc sr, r8
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and r9, r8
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ldc r8, sr
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/* restore other random registers */
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ldc.l @r15+, spc
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lds.l @r15+, pr
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ldc.l @r15+, sr
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ldc.l @r15+, ssr
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ldc.l @r15+, gbr
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lds.l @r15+, mach
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lds.l @r15+, macl
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/* restore r8->r15 */
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mov.l @r15+, r8
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mov.l @r15+, r9
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mov.l @r15+, r10
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mov.l @r15+, r11
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mov.l @r15+, r12
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mov.l @r15+, r13
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mov.l @r15+, r14
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mov.l @r15+, r15
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rts
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nop
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swap_pages:
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bra 1f
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mov r4,r0 /* cmd = indirection_page */
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0:
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mov.l @r4+,r0 /* cmd = *ind++ */
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1: /* addr = cmd & 0xfffffff0 */
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mov r0,r2
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mov #-16,r1
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and r1,r2
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/* if(cmd & IND_DESTINATION) dst = addr */
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tst #1,r0
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bt 2f
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bra 0b
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mov r2,r5
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2: /* else if(cmd & IND_INDIRECTION) ind = addr */
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tst #2,r0
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bt 3f
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bra 0b
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mov r2,r4
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3: /* else if(cmd & IND_DONE) return */
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tst #4,r0
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bt 4f
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rts
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nop
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4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */
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tst #8,r0
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bt 0b
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mov.l 10f,r3 /* PAGE_SIZE */
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shlr2 r3
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shlr2 r3
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5:
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dt r3
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/* regular kexec just overwrites the destination page
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* with the contents of the source page.
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* for the kexec jump case we need to swap the contents
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* of the pages.
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* to keep it simple swap the contents for both cases.
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*/
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mov.l @(0, r2), r8
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mov.l @(0, r5), r1
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mov.l r8, @(0, r5)
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mov.l r1, @(0, r2)
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mov.l @(4, r2), r8
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mov.l @(4, r5), r1
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mov.l r8, @(4, r5)
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mov.l r1, @(4, r2)
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mov.l @(8, r2), r8
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mov.l @(8, r5), r1
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mov.l r8, @(8, r5)
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mov.l r1, @(8, r2)
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mov.l @(12, r2), r8
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mov.l @(12, r5), r1
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mov.l r8, @(12, r5)
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mov.l r1, @(12, r2)
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add #16,r5
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add #16,r2
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bf 5b
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bra 0b
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nop
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.align 2
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10:
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.long PAGE_SIZE
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11:
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.long 0
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12:
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.long 0x20000000 ! RB=1
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relocate_new_kernel_end:
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.globl relocate_new_kernel_size
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relocate_new_kernel_size:
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.long relocate_new_kernel_end - relocate_new_kernel
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