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8bd26e3a7e
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>
274 lines
6.8 KiB
ArmAsm
274 lines
6.8 KiB
ArmAsm
/*
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* linux/arch/arm/mm/proc-sa1100.S
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*
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* Copyright (C) 1997-2002 Russell King
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* hacked for non-paged-MM by Hyok S. Choi, 2003.
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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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* MMU functions for SA110
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*
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* These are the low level assembler for performing cache and TLB
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* functions on the StrongARM-1100 and StrongARM-1110.
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*
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* Note that SA1100 and SA1110 share everything but their name and CPU ID.
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*
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* 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
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* Flush the read buffer at context switches
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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 <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/hwcap.h>
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#include <mach/hardware.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/pgtable.h>
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#include "proc-macros.S"
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/*
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* the cache line size of the I and D cache
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*/
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#define DCACHELINESIZE 32
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.section .text
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/*
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* cpu_sa1100_proc_init()
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*/
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ENTRY(cpu_sa1100_proc_init)
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mov r0, #0
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mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
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mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland
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mov pc, lr
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/*
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* cpu_sa1100_proc_fin()
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*
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* Prepare the CPU for reset:
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* - Disable interrupts
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* - Clean and turn off caches.
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*/
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ENTRY(cpu_sa1100_proc_fin)
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mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching
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mrc p15, 0, r0, c1, c0, 0 @ ctrl register
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bic r0, r0, #0x1000 @ ...i............
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bic r0, r0, #0x000e @ ............wca.
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mcr p15, 0, r0, c1, c0, 0 @ disable caches
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mov pc, lr
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/*
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* cpu_sa1100_reset(loc)
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*
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* Perform a soft reset of the system. Put the CPU into the
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* same state as it would be if it had been reset, and branch
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* to what would be the reset vector.
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*
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* loc: location to jump to for soft reset
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*/
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.align 5
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.pushsection .idmap.text, "ax"
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ENTRY(cpu_sa1100_reset)
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mov ip, #0
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mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
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mcr p15, 0, ip, c7, c10, 4 @ drain WB
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#ifdef CONFIG_MMU
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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#endif
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mrc p15, 0, ip, c1, c0, 0 @ ctrl register
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bic ip, ip, #0x000f @ ............wcam
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bic ip, ip, #0x1100 @ ...i...s........
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mcr p15, 0, ip, c1, c0, 0 @ ctrl register
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mov pc, r0
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ENDPROC(cpu_sa1100_reset)
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.popsection
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/*
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* cpu_sa1100_do_idle(type)
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*
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* Cause the processor to idle
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*
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* type: call type:
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* 0 = slow idle
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* 1 = fast idle
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* 2 = switch to slow processor clock
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* 3 = switch to fast processor clock
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*/
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.align 5
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ENTRY(cpu_sa1100_do_idle)
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mov r0, r0 @ 4 nop padding
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mov r0, r0
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mov r0, r0
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mov r0, r0 @ 4 nop padding
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mov r0, r0
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mov r0, r0
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mov r0, #0
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ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address
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@ --- aligned to a cache line
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mcr p15, 0, r0, c15, c2, 2 @ disable clock switching
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ldr r1, [r1, #0] @ force switch to MCLK
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mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt
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mov r0, r0 @ safety
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mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
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mov pc, lr
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/* ================================= CACHE ================================ */
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/*
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* cpu_sa1100_dcache_clean_area(addr,sz)
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*
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* Clean the specified entry of any caches such that the MMU
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* translation fetches will obtain correct data.
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*
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* addr: cache-unaligned virtual address
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*/
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.align 5
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ENTRY(cpu_sa1100_dcache_clean_area)
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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add r0, r0, #DCACHELINESIZE
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subs r1, r1, #DCACHELINESIZE
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bhi 1b
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mov pc, lr
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/* =============================== PageTable ============================== */
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/*
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* cpu_sa1100_switch_mm(pgd)
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*
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* Set the translation base pointer to be as described by pgd.
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*
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* pgd: new page tables
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*/
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.align 5
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ENTRY(cpu_sa1100_switch_mm)
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#ifdef CONFIG_MMU
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str lr, [sp, #-4]!
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bl v4wb_flush_kern_cache_all @ clears IP
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mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
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mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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ldr pc, [sp], #4
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#else
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mov pc, lr
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#endif
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/*
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* cpu_sa1100_set_pte_ext(ptep, pte, ext)
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*
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* Set a PTE and flush it out
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*/
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.align 5
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ENTRY(cpu_sa1100_set_pte_ext)
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#ifdef CONFIG_MMU
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armv3_set_pte_ext wc_disable=0
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mov r0, r0
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mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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#endif
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mov pc, lr
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.globl cpu_sa1100_suspend_size
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.equ cpu_sa1100_suspend_size, 4 * 3
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#ifdef CONFIG_ARM_CPU_SUSPEND
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ENTRY(cpu_sa1100_do_suspend)
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stmfd sp!, {r4 - r6, lr}
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mrc p15, 0, r4, c3, c0, 0 @ domain ID
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mrc p15, 0, r5, c13, c0, 0 @ PID
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mrc p15, 0, r6, c1, c0, 0 @ control reg
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stmia r0, {r4 - r6} @ store cp regs
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ldmfd sp!, {r4 - r6, pc}
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ENDPROC(cpu_sa1100_do_suspend)
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ENTRY(cpu_sa1100_do_resume)
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ldmia r0, {r4 - r6} @ load cp regs
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mov ip, #0
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mcr p15, 0, ip, c8, c7, 0 @ flush I+D TLBs
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mcr p15, 0, ip, c7, c7, 0 @ flush I&D cache
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mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
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mcr p15, 0, ip, c9, c0, 5 @ allow user space to use RB
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mcr p15, 0, r4, c3, c0, 0 @ domain ID
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mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
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mcr p15, 0, r5, c13, c0, 0 @ PID
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mov r0, r6 @ control register
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b cpu_resume_mmu
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ENDPROC(cpu_sa1100_do_resume)
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#endif
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.type __sa1100_setup, #function
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__sa1100_setup:
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mov r0, #0
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mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
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#ifdef CONFIG_MMU
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mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
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#endif
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adr r5, sa1100_crval
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ldmia r5, {r5, r6}
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mrc p15, 0, r0, c1, c0 @ get control register v4
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bic r0, r0, r5
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orr r0, r0, r6
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mov pc, lr
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.size __sa1100_setup, . - __sa1100_setup
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/*
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* R
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* .RVI ZFRS BLDP WCAM
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* ..11 0001 ..11 1101
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*
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*/
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.type sa1100_crval, #object
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sa1100_crval:
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crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
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__INITDATA
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/*
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* SA1100 and SA1110 share the same function calls
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*/
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@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
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define_processor_functions sa1100, dabort=v4_early_abort, pabort=legacy_pabort, suspend=1
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.section ".rodata"
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string cpu_arch_name, "armv4"
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string cpu_elf_name, "v4"
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string cpu_sa1100_name, "StrongARM-1100"
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string cpu_sa1110_name, "StrongARM-1110"
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.align
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.section ".proc.info.init", #alloc, #execinstr
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.macro sa1100_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req
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.type __\name\()_proc_info,#object
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__\name\()_proc_info:
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.long \cpu_val
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.long \cpu_mask
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.long PMD_TYPE_SECT | \
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PMD_SECT_BUFFERABLE | \
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PMD_SECT_CACHEABLE | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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.long PMD_TYPE_SECT | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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b __sa1100_setup
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.long cpu_arch_name
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.long cpu_elf_name
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.long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
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.long \cpu_name
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.long sa1100_processor_functions
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.long v4wb_tlb_fns
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.long v4_mc_user_fns
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.long v4wb_cache_fns
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.size __\name\()_proc_info, . - __\name\()_proc_info
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.endm
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sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
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sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name
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