https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 authored by Linus Torvalds on 02 October 2016, 23:24:33 UTC
Linux 4.8
Linux 4.8
Tip revision: c8d2bc9
headsmp.S
/*
* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/cp15.h>
ENTRY(uniphier_smp_trampoline)
ARM_BE8(setend be) @ ensure we are in BE8 mode
mrc p15, 0, r0, c0, c0, 5 @ MPIDR (Multiprocessor Affinity Reg)
and r2, r0, #0x3 @ CPU ID
ldr r1, uniphier_smp_trampoline_jump
ldr r3, uniphier_smp_trampoline_poll_addr
mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register)
orr r0, r0, #CR_I @ Enable ICache
bic r0, r0, #(CR_C | CR_M) @ Disable MMU and Dcache
mcr p15, 0, r0, c1, c0, 0
b 1f @ cache the following 5 instructions
0: wfe
1: ldr r0, [r3]
cmp r0, r2
bxeq r1 @ branch to secondary_startup
b 0b
.globl uniphier_smp_trampoline_jump
uniphier_smp_trampoline_jump:
.word 0 @ set virt_to_phys(secondary_startup)
.globl uniphier_smp_trampoline_poll_addr
uniphier_smp_trampoline_poll_addr:
.word 0 @ set CPU ID to be kicked to this reg
.globl uniphier_smp_trampoline_end
uniphier_smp_trampoline_end:
ENDPROC(uniphier_smp_trampoline)