121 lines
2.7 KiB
ArmAsm
121 lines
2.7 KiB
ArmAsm
/*
|
|
* kexec trampoline
|
|
*
|
|
* Based on code taken from kexec-tools and kexec-lite.
|
|
*
|
|
* Copyright (C) 2004 - 2005, Milton D Miller II, IBM Corporation
|
|
* Copyright (C) 2006, Mohan Kumar M, IBM Corporation
|
|
* Copyright (C) 2013, Anton Blanchard, IBM Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it under
|
|
* the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation (version 2 of the License).
|
|
*/
|
|
|
|
#include <asm/asm-compat.h>
|
|
|
|
.machine ppc64
|
|
.balign 256
|
|
.globl purgatory_start
|
|
purgatory_start:
|
|
b master
|
|
|
|
/* ABI: possible run_at_load flag at 0x5c */
|
|
.org purgatory_start + 0x5c
|
|
.globl run_at_load
|
|
run_at_load:
|
|
.long 0
|
|
.size run_at_load, . - run_at_load
|
|
|
|
/* ABI: slaves start at 60 with r3=phys */
|
|
.org purgatory_start + 0x60
|
|
slave:
|
|
b .
|
|
/* ABI: end of copied region */
|
|
.org purgatory_start + 0x100
|
|
.size purgatory_start, . - purgatory_start
|
|
|
|
/*
|
|
* The above 0x100 bytes at purgatory_start are replaced with the
|
|
* code from the kernel (or next stage) by setup_purgatory().
|
|
*/
|
|
|
|
master:
|
|
or %r1,%r1,%r1 /* low priority to let other threads catchup */
|
|
isync
|
|
mr %r17,%r3 /* save cpu id to r17 */
|
|
mr %r15,%r4 /* save physical address in reg15 */
|
|
|
|
or %r3,%r3,%r3 /* ok now to high priority, lets boot */
|
|
lis %r6,0x1
|
|
mtctr %r6 /* delay a bit for slaves to catch up */
|
|
bdnz . /* before we overwrite 0-100 again */
|
|
|
|
bl 0f /* Work out where we're running */
|
|
0: mflr %r18
|
|
|
|
/* load device-tree address */
|
|
ld %r3, (dt_offset - 0b)(%r18)
|
|
mr %r16,%r3 /* save dt address in reg16 */
|
|
li %r4,20
|
|
LWZX_BE %r6,%r3,%r4 /* fetch __be32 version number at byte 20 */
|
|
cmpwi %cr0,%r6,2 /* v2 or later? */
|
|
blt 1f
|
|
li %r4,28
|
|
STWX_BE %r17,%r3,%r4 /* Store my cpu as __be32 at byte 28 */
|
|
1:
|
|
/* load the kernel address */
|
|
ld %r4,(kernel - 0b)(%r18)
|
|
|
|
/* load the run_at_load flag */
|
|
/* possibly patched by kexec */
|
|
ld %r6,(run_at_load - 0b)(%r18)
|
|
/* and patch it into the kernel */
|
|
stw %r6,(0x5c)(%r4)
|
|
|
|
mr %r3,%r16 /* restore dt address */
|
|
|
|
li %r5,0 /* r5 will be 0 for kernel */
|
|
|
|
mfmsr %r11
|
|
andi. %r10,%r11,1 /* test MSR_LE */
|
|
bne .Little_endian
|
|
|
|
mtctr %r4 /* prepare branch to */
|
|
bctr /* start kernel */
|
|
|
|
.Little_endian:
|
|
mtsrr0 %r4 /* prepare branch to */
|
|
|
|
clrrdi %r11,%r11,1 /* clear MSR_LE */
|
|
mtsrr1 %r11
|
|
|
|
rfid /* update MSR and start kernel */
|
|
|
|
|
|
.balign 8
|
|
.globl kernel
|
|
kernel:
|
|
.8byte 0x0
|
|
.size kernel, . - kernel
|
|
|
|
.balign 8
|
|
.globl dt_offset
|
|
dt_offset:
|
|
.8byte 0x0
|
|
.size dt_offset, . - dt_offset
|
|
|
|
|
|
.data
|
|
.balign 8
|
|
.globl purgatory_sha256_digest
|
|
purgatory_sha256_digest:
|
|
.skip 32
|
|
.size purgatory_sha256_digest, . - purgatory_sha256_digest
|
|
|
|
.balign 8
|
|
.globl purgatory_sha_regions
|
|
purgatory_sha_regions:
|
|
.skip 8 * 2 * 16
|
|
.size purgatory_sha_regions, . - purgatory_sha_regions
|