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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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
/*
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* SMP support for R-Mobile / SH-Mobile
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*
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2010 Takashi Yoshii
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*
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* Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/threads.h>
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#include <asm/assembler.h>
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#include <asm/memory.h>
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/*
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* Reset vector for secondary CPUs.
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* This will be mapped at address 0 by SBAR register.
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* We need _long_ jump to the physical address.
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*/
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.arm
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.align 12
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ENTRY(shmobile_boot_vector)
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ldr r1, 1f
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bx r1
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ENDPROC(shmobile_boot_vector)
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.align 2
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.globl shmobile_boot_fn
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shmobile_boot_fn:
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1: .space 4
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.globl shmobile_boot_size
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shmobile_boot_size:
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.long . - shmobile_boot_vector
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/*
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* Per-CPU SMP boot function/argument selection code based on MPIDR
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*/
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ENTRY(shmobile_smp_boot)
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mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR
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and r0, r1, #0xffffff @ MPIDR_HWID_BITMASK
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@ r0 = cpu_logical_map() value
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mov r1, #0 @ r1 = CPU index
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adr r2, 1f
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ldmia r2, {r5, r6, r7}
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add r5, r5, r2 @ array of per-cpu mpidr values
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add r6, r6, r2 @ array of per-cpu functions
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add r7, r7, r2 @ array of per-cpu arguments
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shmobile_smp_boot_find_mpidr:
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ldr r8, [r5, r1, lsl #2]
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cmp r8, r0
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bne shmobile_smp_boot_next
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ldr r9, [r6, r1, lsl #2]
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cmp r9, #0
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bne shmobile_smp_boot_found
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shmobile_smp_boot_next:
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add r1, r1, #1
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cmp r1, #NR_CPUS
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blo shmobile_smp_boot_find_mpidr
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b shmobile_smp_sleep
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shmobile_smp_boot_found:
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ldr r0, [r7, r1, lsl #2]
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ret r9
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ENDPROC(shmobile_smp_boot)
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ENTRY(shmobile_smp_sleep)
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wfi
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b shmobile_smp_boot
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ENDPROC(shmobile_smp_sleep)
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.align 2
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1: .long shmobile_smp_mpidr - .
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.long shmobile_smp_fn - 1b
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.long shmobile_smp_arg - 1b
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.bss
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.globl shmobile_smp_mpidr
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shmobile_smp_mpidr:
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.space NR_CPUS * 4
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.globl shmobile_smp_fn
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shmobile_smp_fn:
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.space NR_CPUS * 4
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.globl shmobile_smp_arg
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shmobile_smp_arg:
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.space NR_CPUS * 4
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