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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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44 lines
1.5 KiB
ArmAsm
44 lines
1.5 KiB
ArmAsm
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/*
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* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/cp15.h>
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ENTRY(uniphier_smp_trampoline)
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ARM_BE8(setend be) @ ensure we are in BE8 mode
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mrc p15, 0, r0, c0, c0, 5 @ MPIDR (Multiprocessor Affinity Reg)
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and r2, r0, #0x3 @ CPU ID
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ldr r1, uniphier_smp_trampoline_jump
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ldr r3, uniphier_smp_trampoline_poll_addr
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mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register)
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orr r0, r0, #CR_I @ Enable ICache
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bic r0, r0, #(CR_C | CR_M) @ Disable MMU and Dcache
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mcr p15, 0, r0, c1, c0, 0
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b 1f @ cache the following 5 instructions
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0: wfe
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1: ldr r0, [r3]
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cmp r0, r2
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bxeq r1 @ branch to secondary_startup
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b 0b
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.globl uniphier_smp_trampoline_jump
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uniphier_smp_trampoline_jump:
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.word 0 @ set virt_to_phys(secondary_startup)
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.globl uniphier_smp_trampoline_poll_addr
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uniphier_smp_trampoline_poll_addr:
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.word 0 @ set CPU ID to be kicked to this reg
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.globl uniphier_smp_trampoline_end
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uniphier_smp_trampoline_end:
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ENDPROC(uniphier_smp_trampoline)
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