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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>
533 lines
14 KiB
ArmAsm
533 lines
14 KiB
ArmAsm
/*
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* linux/arch/arm/mm/proc-xsc3.S
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*
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* Original Author: Matthew Gilbert
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* Current Maintainer: Lennert Buytenhek <buytenh@wantstofly.org>
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*
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* Copyright 2004 (C) Intel Corp.
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* Copyright 2005 (C) MontaVista Software, Inc.
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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 the Intel XScale3 Core (XSC3). The XSC3 core is
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* an extension to Intel's original XScale core that adds the following
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* features:
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*
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* - ARMv6 Supersections
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* - Low Locality Reference pages (replaces mini-cache)
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* - 36-bit addressing
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* - L2 cache
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* - Cache coherency if chipset supports it
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*
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* Based on original XScale code by Nicolas Pitre.
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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/hwcap.h>
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#include <asm/pgtable.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include "proc-macros.S"
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/*
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* This is the maximum size of an area which will be flushed. If the
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* area is larger than this, then we flush the whole cache.
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*/
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#define MAX_AREA_SIZE 32768
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/*
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* The cache line size of the L1 I, L1 D and unified L2 cache.
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*/
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#define CACHELINESIZE 32
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/*
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* The size of the L1 D cache.
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*/
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#define CACHESIZE 32768
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/*
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* This macro is used to wait for a CP15 write and is needed when we
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* have to ensure that the last operation to the coprocessor was
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* completed before continuing with operation.
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*/
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.macro cpwait_ret, lr, rd
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mrc p15, 0, \rd, c2, c0, 0 @ arbitrary read of cp15
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sub pc, \lr, \rd, LSR #32 @ wait for completion and
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@ flush instruction pipeline
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.endm
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/*
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* This macro cleans and invalidates the entire L1 D cache.
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*/
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.macro clean_d_cache rd, rs
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mov \rd, #0x1f00
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orr \rd, \rd, #0x00e0
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1: mcr p15, 0, \rd, c7, c14, 2 @ clean/invalidate L1 D line
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adds \rd, \rd, #0x40000000
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bcc 1b
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subs \rd, \rd, #0x20
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bpl 1b
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.endm
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.text
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/*
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* cpu_xsc3_proc_init()
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*
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* Nothing too exciting at the moment
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*/
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ENTRY(cpu_xsc3_proc_init)
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mov pc, lr
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/*
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* cpu_xsc3_proc_fin()
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*/
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ENTRY(cpu_xsc3_proc_fin)
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mrc p15, 0, r0, c1, c0, 0 @ ctrl register
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bic r0, r0, #0x1800 @ ...IZ...........
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bic r0, r0, #0x0006 @ .............CA.
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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_xsc3_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_xsc3_reset)
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mov r1, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
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msr cpsr_c, r1 @ reset CPSR
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mrc p15, 0, r1, c1, c0, 0 @ ctrl register
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bic r1, r1, #0x3900 @ ..VIZ..S........
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bic r1, r1, #0x0086 @ ........B....CA.
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mcr p15, 0, r1, c1, c0, 0 @ ctrl register
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mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
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bic r1, r1, #0x0001 @ ...............M
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mcr p15, 0, r1, c1, c0, 0 @ ctrl register
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@ CAUTION: MMU turned off from this point. We count on the pipeline
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@ already containing those two last instructions to survive.
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
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mov pc, r0
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ENDPROC(cpu_xsc3_reset)
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.popsection
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/*
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* cpu_xsc3_do_idle()
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*
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* Cause the processor to idle
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*
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* For now we do nothing but go to idle mode for every case
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*
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* XScale supports clock switching, but using idle mode support
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* allows external hardware to react to system state changes.
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*/
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.align 5
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ENTRY(cpu_xsc3_do_idle)
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mov r0, #1
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mcr p14, 0, r0, c7, c0, 0 @ go to idle
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mov pc, lr
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/* ================================= CACHE ================================ */
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/*
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* flush_icache_all()
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*
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* Unconditionally clean and invalidate the entire icache.
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*/
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ENTRY(xsc3_flush_icache_all)
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
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mov pc, lr
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ENDPROC(xsc3_flush_icache_all)
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/*
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* flush_user_cache_all()
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*
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* Invalidate all cache entries in a particular address
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* space.
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*/
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ENTRY(xsc3_flush_user_cache_all)
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/* FALLTHROUGH */
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/*
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* flush_kern_cache_all()
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*
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* Clean and invalidate the entire cache.
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*/
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ENTRY(xsc3_flush_kern_cache_all)
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mov r2, #VM_EXEC
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mov ip, #0
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__flush_whole_cache:
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clean_d_cache r0, r1
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tst r2, #VM_EXEC
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mcrne p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
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mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
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mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
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mov pc, lr
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/*
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* flush_user_cache_range(start, end, vm_flags)
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*
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* Invalidate a range of cache entries in the specified
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* address space.
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*
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* - start - start address (may not be aligned)
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* - end - end address (exclusive, may not be aligned)
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* - vma - vma_area_struct describing address space
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*/
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.align 5
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ENTRY(xsc3_flush_user_cache_range)
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mov ip, #0
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sub r3, r1, r0 @ calculate total size
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cmp r3, #MAX_AREA_SIZE
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bhs __flush_whole_cache
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1: tst r2, #VM_EXEC
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate L1 I line
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mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
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add r0, r0, #CACHELINESIZE
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cmp r0, r1
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blo 1b
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tst r2, #VM_EXEC
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mcrne p15, 0, ip, c7, c5, 6 @ invalidate BTB
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mcrne p15, 0, ip, c7, c10, 4 @ data write barrier
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mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush
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mov pc, lr
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/*
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* coherent_kern_range(start, end)
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*
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* Ensure coherency between the I cache and the D cache in the
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* region described by start. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*
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* Note: single I-cache line invalidation isn't used here since
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* it also trashes the mini I-cache used by JTAG debuggers.
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*/
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ENTRY(xsc3_coherent_kern_range)
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/* FALLTHROUGH */
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ENTRY(xsc3_coherent_user_range)
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bic r0, r0, #CACHELINESIZE - 1
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1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
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add r0, r0, #CACHELINESIZE
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cmp r0, r1
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
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mcr p15, 0, r0, c7, c10, 4 @ data write barrier
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mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
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mov pc, lr
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/*
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* flush_kern_dcache_area(void *addr, size_t size)
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*
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* Ensure no D cache aliasing occurs, either with itself or
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* the I cache.
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*
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* - addr - kernel address
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* - size - region size
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*/
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ENTRY(xsc3_flush_kern_dcache_area)
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add r1, r0, r1
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1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
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add r0, r0, #CACHELINESIZE
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cmp r0, r1
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate L1 I cache and BTB
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mcr p15, 0, r0, c7, c10, 4 @ data write barrier
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mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
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mov pc, lr
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/*
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* dma_inv_range(start, end)
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*
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* Invalidate (discard) the specified virtual address range.
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* May not write back any entries. If 'start' or 'end'
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* are not cache line aligned, those lines must be written
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* back.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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xsc3_dma_inv_range:
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tst r0, #CACHELINESIZE - 1
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bic r0, r0, #CACHELINESIZE - 1
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mcrne p15, 0, r0, c7, c10, 1 @ clean L1 D line
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tst r1, #CACHELINESIZE - 1
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mcrne p15, 0, r1, c7, c10, 1 @ clean L1 D line
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1: mcr p15, 0, r0, c7, c6, 1 @ invalidate L1 D line
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add r0, r0, #CACHELINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ data write barrier
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mov pc, lr
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/*
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* dma_clean_range(start, end)
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*
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* Clean the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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xsc3_dma_clean_range:
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bic r0, r0, #CACHELINESIZE - 1
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1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
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add r0, r0, #CACHELINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ data write barrier
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mov pc, lr
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/*
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* dma_flush_range(start, end)
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*
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* Clean and invalidate the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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ENTRY(xsc3_dma_flush_range)
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bic r0, r0, #CACHELINESIZE - 1
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1: mcr p15, 0, r0, c7, c14, 1 @ clean/invalidate L1 D line
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add r0, r0, #CACHELINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ data write barrier
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mov pc, lr
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/*
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* dma_map_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(xsc3_dma_map_area)
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add r1, r1, r0
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cmp r2, #DMA_TO_DEVICE
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beq xsc3_dma_clean_range
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bcs xsc3_dma_inv_range
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b xsc3_dma_flush_range
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ENDPROC(xsc3_dma_map_area)
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/*
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* dma_unmap_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(xsc3_dma_unmap_area)
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mov pc, lr
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ENDPROC(xsc3_dma_unmap_area)
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.globl xsc3_flush_kern_cache_louis
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.equ xsc3_flush_kern_cache_louis, xsc3_flush_kern_cache_all
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
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define_cache_functions xsc3
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ENTRY(cpu_xsc3_dcache_clean_area)
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1: mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
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add r0, r0, #CACHELINESIZE
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subs r1, r1, #CACHELINESIZE
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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_xsc3_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_xsc3_switch_mm)
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clean_d_cache r1, r2
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mcr p15, 0, ip, c7, c5, 0 @ invalidate L1 I cache and BTB
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mcr p15, 0, ip, c7, c10, 4 @ data write barrier
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mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
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orr r0, r0, #0x18 @ cache the page table in L2
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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 and D TLBs
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cpwait_ret lr, ip
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/*
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* cpu_xsc3_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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cpu_xsc3_mt_table:
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.long 0x00 @ L_PTE_MT_UNCACHED
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.long PTE_EXT_TEX(1) @ L_PTE_MT_BUFFERABLE
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.long PTE_EXT_TEX(5) | PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
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.long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
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.long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
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.long 0x00 @ unused
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.long 0x00 @ L_PTE_MT_MINICACHE (not present)
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.long PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC (not present?)
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.long 0x00 @ unused
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.long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC
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.long 0x00 @ unused
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.long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
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.long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED
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.long 0x00 @ unused
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.long 0x00 @ unused
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.long 0x00 @ unused
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.align 5
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ENTRY(cpu_xsc3_set_pte_ext)
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xscale_set_pte_ext_prologue
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tst r1, #L_PTE_SHARED @ shared?
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and r1, r1, #L_PTE_MT_MASK
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adr ip, cpu_xsc3_mt_table
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ldr ip, [ip, r1]
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orrne r2, r2, #PTE_EXT_COHERENT @ interlock: mask in coherent bit
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bic r2, r2, #0x0c @ clear old C,B bits
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orr r2, r2, ip
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xscale_set_pte_ext_epilogue
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mov pc, lr
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.ltorg
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.align
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.globl cpu_xsc3_suspend_size
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.equ cpu_xsc3_suspend_size, 4 * 6
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#ifdef CONFIG_ARM_CPU_SUSPEND
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ENTRY(cpu_xsc3_do_suspend)
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stmfd sp!, {r4 - r9, lr}
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mrc p14, 0, r4, c6, c0, 0 @ clock configuration, for turbo mode
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mrc p15, 0, r5, c15, c1, 0 @ CP access reg
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mrc p15, 0, r6, c13, c0, 0 @ PID
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mrc p15, 0, r7, c3, c0, 0 @ domain ID
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mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg
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mrc p15, 0, r9, c1, c0, 0 @ control reg
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bic r4, r4, #2 @ clear frequency change bit
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stmia r0, {r4 - r9} @ store cp regs
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ldmia sp!, {r4 - r9, pc}
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ENDPROC(cpu_xsc3_do_suspend)
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ENTRY(cpu_xsc3_do_resume)
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ldmia r0, {r4 - r9} @ load cp regs
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mov ip, #0
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mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB
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mcr p15, 0, ip, c7, c10, 4 @ drain write (&fill) buffer
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mcr p15, 0, ip, c7, c5, 4 @ flush prefetch buffer
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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mcr p14, 0, r4, c6, c0, 0 @ clock configuration, turbo mode.
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mcr p15, 0, r5, c15, c1, 0 @ CP access reg
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mcr p15, 0, r6, c13, c0, 0 @ PID
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mcr p15, 0, r7, c3, c0, 0 @ domain ID
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orr r1, r1, #0x18 @ cache the page table in L2
|
|
mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
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mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg
|
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mov r0, r9 @ control register
|
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b cpu_resume_mmu
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ENDPROC(cpu_xsc3_do_resume)
|
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#endif
|
|
|
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.type __xsc3_setup, #function
|
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__xsc3_setup:
|
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mov r0, #PSR_F_BIT|PSR_I_BIT|SVC_MODE
|
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msr cpsr_c, r0
|
|
mcr p15, 0, ip, c7, c7, 0 @ invalidate L1 caches and BTB
|
|
mcr p15, 0, ip, c7, c10, 4 @ data write barrier
|
|
mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I and D TLBs
|
|
orr r4, r4, #0x18 @ cache the page table in L2
|
|
mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
|
|
|
|
mov r0, #1 << 6 @ cp6 access for early sched_clock
|
|
mcr p15, 0, r0, c15, c1, 0 @ write CP access register
|
|
|
|
mrc p15, 0, r0, c1, c0, 1 @ get auxiliary control reg
|
|
and r0, r0, #2 @ preserve bit P bit setting
|
|
orr r0, r0, #(1 << 10) @ enable L2 for LLR cache
|
|
mcr p15, 0, r0, c1, c0, 1 @ set auxiliary control reg
|
|
|
|
adr r5, xsc3_crval
|
|
ldmia r5, {r5, r6}
|
|
|
|
#ifdef CONFIG_CACHE_XSC3L2
|
|
mrc p15, 1, r0, c0, c0, 1 @ get L2 present information
|
|
ands r0, r0, #0xf8
|
|
orrne r6, r6, #(1 << 26) @ enable L2 if present
|
|
#endif
|
|
|
|
mrc p15, 0, r0, c1, c0, 0 @ get control register
|
|
bic r0, r0, r5 @ ..V. ..R. .... ..A.
|
|
orr r0, r0, r6 @ ..VI Z..S .... .C.M (mmu)
|
|
@ ...I Z..S .... .... (uc)
|
|
mov pc, lr
|
|
|
|
.size __xsc3_setup, . - __xsc3_setup
|
|
|
|
.type xsc3_crval, #object
|
|
xsc3_crval:
|
|
crval clear=0x04002202, mmuset=0x00003905, ucset=0x00001900
|
|
|
|
__INITDATA
|
|
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
|
define_processor_functions xsc3, dabort=v5t_early_abort, pabort=legacy_pabort, suspend=1
|
|
|
|
.section ".rodata"
|
|
|
|
string cpu_arch_name, "armv5te"
|
|
string cpu_elf_name, "v5"
|
|
string cpu_xsc3_name, "XScale-V3 based processor"
|
|
|
|
.align
|
|
|
|
.section ".proc.info.init", #alloc, #execinstr
|
|
|
|
.macro xsc3_proc_info name:req, cpu_val:req, cpu_mask:req
|
|
.type __\name\()_proc_info,#object
|
|
__\name\()_proc_info:
|
|
.long \cpu_val
|
|
.long \cpu_mask
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_BUFFERABLE | \
|
|
PMD_SECT_CACHEABLE | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
b __xsc3_setup
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
|
|
.long cpu_xsc3_name
|
|
.long xsc3_processor_functions
|
|
.long v4wbi_tlb_fns
|
|
.long xsc3_mc_user_fns
|
|
.long xsc3_cache_fns
|
|
.size __\name\()_proc_info, . - __\name\()_proc_info
|
|
.endm
|
|
|
|
xsc3_proc_info xsc3, 0x69056000, 0xffffe000
|
|
|
|
/* Note: PXA935 changed its implementor ID from Intel to Marvell */
|
|
xsc3_proc_info xsc3_pxa935, 0x56056000, 0xffffe000
|