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The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
This removes all the ARM uses of the __cpuinit macros from C code,
and all __CPUINIT from assembly code. It also had two ".previous"
section statements that were paired off against __CPUINIT
(aka .section ".cpuinit.text") that also get removed here.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
103 lines
2.8 KiB
ArmAsm
103 lines
2.8 KiB
ArmAsm
/*
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* Secondary CPU startup routine source file.
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*
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* Copyright (C) 2009 Texas Instruments, Inc.
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*
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* Author:
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* Santosh Shilimkar <santosh.shilimkar@ti.com>
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*
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* Interface functions needed for the SMP. This file is based on arm
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* realview smp platform.
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* Copyright (c) 2003 ARM Limited.
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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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#include "omap44xx.h"
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/* Physical address needed since MMU not enabled yet on secondary core */
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#define AUX_CORE_BOOT0_PA 0x48281800
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/*
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* OMAP5 specific entry point for secondary CPU to jump from ROM
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* code. This routine also provides a holding flag into which
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* secondary core is held until we're ready for it to initialise.
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* The primary core will update this flag using a hardware
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+ * register AuxCoreBoot0.
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*/
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ENTRY(omap5_secondary_startup)
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wait: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0
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ldr r0, [r2]
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mov r0, r0, lsr #5
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mrc p15, 0, r4, c0, c0, 5
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and r4, r4, #0x0f
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cmp r0, r4
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bne wait
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b secondary_startup
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END(omap5_secondary_startup)
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/*
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* OMAP4 specific entry point for secondary CPU to jump from ROM
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* code. This routine also provides a holding flag into which
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* secondary core is held until we're ready for it to initialise.
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* The primary core will update this flag using a hardware
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* register AuxCoreBoot0.
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*/
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ENTRY(omap4_secondary_startup)
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hold: ldr r12,=0x103
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dsb
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smc #0 @ read from AuxCoreBoot0
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mov r0, r0, lsr #9
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mrc p15, 0, r4, c0, c0, 5
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and r4, r4, #0x0f
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cmp r0, r4
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bne hold
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/*
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* we've been released from the wait loop,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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ENDPROC(omap4_secondary_startup)
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ENTRY(omap4460_secondary_startup)
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hold_2: ldr r12,=0x103
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dsb
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smc #0 @ read from AuxCoreBoot0
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mov r0, r0, lsr #9
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mrc p15, 0, r4, c0, c0, 5
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and r4, r4, #0x0f
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cmp r0, r4
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bne hold_2
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/*
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* GIC distributor control register has changed between
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* CortexA9 r1pX and r2pX. The Control Register secure
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* banked version is now composed of 2 bits:
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* bit 0 == Secure Enable
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* bit 1 == Non-Secure Enable
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* The Non-Secure banked register has not changed
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* Because the ROM Code is based on the r1pX GIC, the CPU1
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* GIC restoration will cause a problem to CPU0 Non-Secure SW.
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* The workaround must be:
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* 1) Before doing the CPU1 wakeup, CPU0 must disable
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* the GIC distributor
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* 2) CPU1 must re-enable the GIC distributor on
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* it's wakeup path.
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*/
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ldr r1, =OMAP44XX_GIC_DIST_BASE
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ldr r0, [r1]
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orr r0, #1
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str r0, [r1]
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/*
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* we've been released from the wait loop,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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ENDPROC(omap4460_secondary_startup)
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