mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 10:39:23 +07:00
901c5ffaae
CPU boot configuration writes to shmobile_boot_arg, which is located in
the .text section, and thus should not be written to.
As of commit 1d33a354bb ("ARM: shmobile: Per-CPU SMP boot / sleep
code for SCU SoCs"), and ignoring accidental remainings,
shmobile_boot_arg is always set to MPIDR_HWID_BITMASK by C code.
Hence we can just hardcode this in the assembler code, and remove the
variable, and thus also remove the need to write to this variable.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
96 lines
2.0 KiB
ArmAsm
96 lines
2.0 KiB
ArmAsm
/*
|
|
* SMP support for R-Mobile / SH-Mobile
|
|
*
|
|
* Copyright (C) 2010 Magnus Damm
|
|
* Copyright (C) 2010 Takashi Yoshii
|
|
*
|
|
* Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/threads.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/memory.h>
|
|
|
|
/*
|
|
* Reset vector for secondary CPUs.
|
|
* This will be mapped at address 0 by SBAR register.
|
|
* We need _long_ jump to the physical address.
|
|
*/
|
|
.arm
|
|
.align 12
|
|
ENTRY(shmobile_boot_vector)
|
|
ldr r1, 1f
|
|
bx r1
|
|
|
|
ENDPROC(shmobile_boot_vector)
|
|
|
|
.align 2
|
|
.globl shmobile_boot_fn
|
|
shmobile_boot_fn:
|
|
1: .space 4
|
|
.globl shmobile_boot_size
|
|
shmobile_boot_size:
|
|
.long . - shmobile_boot_vector
|
|
|
|
/*
|
|
* Per-CPU SMP boot function/argument selection code based on MPIDR
|
|
*/
|
|
|
|
ENTRY(shmobile_smp_boot)
|
|
mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR
|
|
and r0, r1, #0xffffff @ MPIDR_HWID_BITMASK
|
|
@ r0 = cpu_logical_map() value
|
|
mov r1, #0 @ r1 = CPU index
|
|
adr r2, 1f
|
|
ldmia r2, {r5, r6, r7}
|
|
add r5, r5, r2 @ array of per-cpu mpidr values
|
|
add r6, r6, r2 @ array of per-cpu functions
|
|
add r7, r7, r2 @ array of per-cpu arguments
|
|
|
|
shmobile_smp_boot_find_mpidr:
|
|
ldr r8, [r5, r1, lsl #2]
|
|
cmp r8, r0
|
|
bne shmobile_smp_boot_next
|
|
|
|
ldr r9, [r6, r1, lsl #2]
|
|
cmp r9, #0
|
|
bne shmobile_smp_boot_found
|
|
|
|
shmobile_smp_boot_next:
|
|
add r1, r1, #1
|
|
cmp r1, #NR_CPUS
|
|
blo shmobile_smp_boot_find_mpidr
|
|
|
|
b shmobile_smp_sleep
|
|
|
|
shmobile_smp_boot_found:
|
|
ldr r0, [r7, r1, lsl #2]
|
|
ret r9
|
|
ENDPROC(shmobile_smp_boot)
|
|
|
|
ENTRY(shmobile_smp_sleep)
|
|
wfi
|
|
b shmobile_smp_boot
|
|
ENDPROC(shmobile_smp_sleep)
|
|
|
|
.align 2
|
|
1: .long shmobile_smp_mpidr - .
|
|
.long shmobile_smp_fn - 1b
|
|
.long shmobile_smp_arg - 1b
|
|
|
|
.bss
|
|
.globl shmobile_smp_mpidr
|
|
shmobile_smp_mpidr:
|
|
.space NR_CPUS * 4
|
|
.globl shmobile_smp_fn
|
|
shmobile_smp_fn:
|
|
.space NR_CPUS * 4
|
|
.globl shmobile_smp_arg
|
|
shmobile_smp_arg:
|
|
.space NR_CPUS * 4
|