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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* kexec for arm64
*
* Copyright (C) Linaro.
* Copyright (C) Huawei Futurewei Technologies.
*/
#include <linux/kexec.h>
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/kexec.h>
#include <asm/page.h>
#include <asm/sysreg.h>
/*
* arm64_relocate_new_kernel - Put a 2nd stage image in place and boot it.
*
* The memory that the old kernel occupies may be overwritten when copying the
* new image to its final location. To assure that the
* arm64_relocate_new_kernel routine which does that copy is not overwritten,
* all code and data needed by arm64_relocate_new_kernel must be between the
* symbols arm64_relocate_new_kernel and arm64_relocate_new_kernel_end. The
* machine_kexec() routine will copy arm64_relocate_new_kernel to the kexec
* safe memory that has been set up to be preserved during the copy operation.
*/
SYM_CODE_START(arm64_relocate_new_kernel)
/* Setup the list loop variables. */
mov x18, x2 /* x18 = dtb address */
mov x17, x1 /* x17 = kimage_start */
mov x16, x0 /* x16 = kimage_head */
mov x14, xzr /* x14 = entry ptr */
mov x13, xzr /* x13 = copy dest */
/* Check if the new image needs relocation. */
tbnz x16, IND_DONE_BIT, .Ldone
raw_dcache_line_size x15, x1 /* x15 = dcache line size */
.Lloop:
and x12, x16, PAGE_MASK /* x12 = addr */
/* Test the entry flags. */
.Ltest_source:
tbz x16, IND_SOURCE_BIT, .Ltest_indirection
/* Invalidate dest page to PoC. */
mov x2, x13
add x20, x2, #PAGE_SIZE
sub x1, x15, #1
bic x2, x2, x1
2: dc ivac, x2
add x2, x2, x15
cmp x2, x20
b.lo 2b
dsb sy
copy_page x13, x12, x1, x2, x3, x4, x5, x6, x7, x8
b .Lnext
.Ltest_indirection:
tbz x16, IND_INDIRECTION_BIT, .Ltest_destination
mov x14, x12 /* ptr = addr */
b .Lnext
.Ltest_destination:
tbz x16, IND_DESTINATION_BIT, .Lnext
mov x13, x12 /* dest = addr */
.Lnext:
ldr x16, [x14], #8 /* entry = *ptr++ */
tbz x16, IND_DONE_BIT, .Lloop /* while (!(entry & DONE)) */
.Ldone:
/* wait for writes from copy_page to finish */
dsb nsh
ic iallu
dsb nsh
isb
/* Start new image. */
mov x0, x18
mov x1, xzr
mov x2, xzr
mov x3, xzr
br x17
SYM_CODE_END(arm64_relocate_new_kernel)
.align 3 /* To keep the 64-bit values below naturally aligned. */
.Lcopy_end:
.org KEXEC_CONTROL_PAGE_SIZE
/*
* arm64_relocate_new_kernel_size - Number of bytes to copy to the
* control_code_page.
*/
.globl arm64_relocate_new_kernel_size
arm64_relocate_new_kernel_size:
.quad .Lcopy_end - arm64_relocate_new_kernel
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