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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* relocate_kernel.S for kexec
* Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006
*/
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/stackframe.h>
#include <asm/addrspace.h>
#include <kernel-entry-init.h>
LEAF(relocate_new_kernel)
PTR_L a0, arg0
PTR_L a1, arg1
PTR_L a2, arg2
PTR_L a3, arg3
PTR_L s0, kexec_indirection_page
PTR_L s1, kexec_start_address
process_entry:
PTR_L s2, (s0)
PTR_ADDIU s0, s0, SZREG
/*
* In case of a kdump/crash kernel, the indirection page is not
* populated as the kernel is directly copied to a reserved location
*/
beqz s2, done
/* destination page */
and s3, s2, 0x1
beq s3, zero, 1f
and s4, s2, ~0x1 /* store destination addr in s4 */
b process_entry
1:
/* indirection page, update s0 */
and s3, s2, 0x2
beq s3, zero, 1f
and s0, s2, ~0x2
b process_entry
1:
/* done page */
and s3, s2, 0x4
beq s3, zero, 1f
b done
1:
/* source page */
and s3, s2, 0x8
beq s3, zero, process_entry
and s2, s2, ~0x8
li s6, (1 << _PAGE_SHIFT) / SZREG
copy_word:
/* copy page word by word */
REG_L s5, (s2)
REG_S s5, (s4)
PTR_ADDIU s4, s4, SZREG
PTR_ADDIU s2, s2, SZREG
LONG_ADDIU s6, s6, -1
beq s6, zero, process_entry
b copy_word
done:
#ifdef CONFIG_SMP
/* kexec_flag reset is signal to other CPUs what kernel
was moved to it's location. Note - we need relocated address
of kexec_flag. */
bal 1f
1: move t1,ra;
PTR_LA t2,1b
PTR_LA t0,kexec_flag
PTR_SUB t0,t0,t2;
PTR_ADD t0,t1,t0;
LONG_S zero,(t0)
#endif
#ifdef CONFIG_CPU_CAVIUM_OCTEON
/* We need to flush I-cache before jumping to new kernel.
* Unfortunately, this code is cpu-specific.
*/
.set push
.set noreorder
syncw
syncw
synci 0($0)
.set pop
#else
sync
#endif
/* jump to kexec_start_address */
j s1
END(relocate_new_kernel)
#ifdef CONFIG_SMP
/*
* Other CPUs should wait until code is relocated and
* then start at entry (?) point.
*/
LEAF(kexec_smp_wait)
PTR_L a0, s_arg0
PTR_L a1, s_arg1
PTR_L a2, s_arg2
PTR_L a3, s_arg3
PTR_L s1, kexec_start_address
/* Non-relocated address works for args and kexec_start_address ( old
* kernel is not overwritten). But we need relocated address of
* kexec_flag.
*/
bal 1f
1: move t1,ra;
PTR_LA t2,1b
PTR_LA t0,kexec_flag
PTR_SUB t0,t0,t2;
PTR_ADD t0,t1,t0;
1: LONG_L s0, (t0)
bne s0, zero,1b
#ifdef USE_KEXEC_SMP_WAIT_FINAL
kexec_smp_wait_final
#else
sync
#endif
j s1
END(kexec_smp_wait)
#endif
#ifdef __mips64
/* all PTR's must be aligned to 8 byte in 64-bit mode */
.align 3
#endif
/* All parameters to new kernel are passed in registers a0-a3.
* kexec_args[0..3] are used to prepare register values.
*/
EXPORT(kexec_args)
arg0: PTR_WD 0x0
arg1: PTR_WD 0x0
arg2: PTR_WD 0x0
arg3: PTR_WD 0x0
.size kexec_args,PTRSIZE*4
#ifdef CONFIG_SMP
/*
* Secondary CPUs may have different kernel parameters in
* their registers a0-a3. secondary_kexec_args[0..3] are used
* to prepare register values.
*/
EXPORT(secondary_kexec_args)
s_arg0: PTR_WD 0x0
s_arg1: PTR_WD 0x0
s_arg2: PTR_WD 0x0
s_arg3: PTR_WD 0x0
.size secondary_kexec_args,PTRSIZE*4
kexec_flag:
LONG 0x1
#endif
EXPORT(kexec_start_address)
PTR_WD 0x0
.size kexec_start_address, PTRSIZE
EXPORT(kexec_indirection_page)
PTR_WD 0
.size kexec_indirection_page, PTRSIZE
relocate_new_kernel_end:
EXPORT(relocate_new_kernel_size)
PTR_WD relocate_new_kernel_end - relocate_new_kernel
.size relocate_new_kernel_size, PTRSIZE
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