48 строки
1.1 KiB
ArmAsm
48 строки
1.1 KiB
ArmAsm
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/*
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* arch/arm/mach-spear13XX/headsmp.S
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*
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* Picked from realview
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* Copyright (c) 2012 ST Microelectronics Limited
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* Shiraz Hashim <shiraz.hashim@st.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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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__INIT
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/*
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* spear13xx specific entry point for secondary CPUs. This provides
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* a "holding pen" into which all secondary cores are held until we're
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* ready for them to initialise.
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*/
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ENTRY(spear13xx_secondary_startup)
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mrc p15, 0, r0, c0, c0, 5
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and r0, r0, #15
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adr r4, 1f
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ldmia r4, {r5, r6}
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sub r4, r4, r5
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add r6, r6, r4
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pen: ldr r7, [r6]
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cmp r7, r0
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bne pen
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/* re-enable coherency */
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mrc p15, 0, r0, c1, c0, 1
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orr r0, r0, #(1 << 6) | (1 << 0)
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mcr p15, 0, r0, c1, c0, 1
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/*
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* we've been released from the holding pen: secondary_stack
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* should now contain the SVC stack for this core
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*/
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b secondary_startup
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.align
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1: .long .
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.long pen_release
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ENDPROC(spear13xx_secondary_startup)
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