a248b13b21
The v6 and v7 implementations of flush_kern_dcache_area do not align the passed MVA to the size of a cacheline in the data cache. If a misaligned address is used, only a subset of the requested area will be flushed. This has been observed to cause failures in SMP boot where the secondary_data initialised by the primary CPU is not cacheline aligned, causing the secondary CPUs to read incorrect values for their pgd and stack pointers. This patch ensures that the base address is cacheline aligned before flushing the d-cache. Cc: <stable@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
346 lines
8.1 KiB
ArmAsm
346 lines
8.1 KiB
ArmAsm
/*
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* linux/arch/arm/mm/cache-v6.S
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*
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* Copyright (C) 2001 Deep Blue Solutions Ltd.
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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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* This is the "shell" of the ARMv6 processor support.
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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/unwind.h>
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#include "proc-macros.S"
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#define HARVARD_CACHE
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#define CACHE_LINE_SIZE 32
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#define D_CACHE_LINE_SIZE 32
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#define BTB_FLUSH_SIZE 8
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/*
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* v6_flush_icache_all()
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*
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* Flush the whole I-cache.
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*
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* ARM1136 erratum 411920 - Invalidate Instruction Cache operation can fail.
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* This erratum is present in 1136, 1156 and 1176. It does not affect the
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* MPCore.
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*
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* Registers:
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* r0 - set to 0
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* r1 - corrupted
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*/
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ENTRY(v6_flush_icache_all)
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mov r0, #0
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#ifdef CONFIG_ARM_ERRATA_411920
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mrs r1, cpsr
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cpsid ifa @ disable interrupts
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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msr cpsr_cx, r1 @ restore interrupts
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.rept 11 @ ARM Ltd recommends at least
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nop @ 11 NOPs
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.endr
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#else
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I-cache
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#endif
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mov pc, lr
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ENDPROC(v6_flush_icache_all)
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/*
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* v6_flush_cache_all()
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*
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* Flush the entire cache.
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*
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* It is assumed that:
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*/
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ENTRY(v6_flush_kern_cache_all)
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mov r0, #0
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 0 @ D cache clean+invalidate
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#ifndef CONFIG_ARM_ERRATA_411920
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mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
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#else
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b v6_flush_icache_all
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#endif
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#else
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mcr p15, 0, r0, c7, c15, 0 @ Cache clean+invalidate
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#endif
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mov pc, lr
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/*
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* v6_flush_cache_all()
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*
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* Flush all TLB entries in a particular address space
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*
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* - mm - mm_struct describing address space
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*/
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ENTRY(v6_flush_user_cache_all)
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/*FALLTHROUGH*/
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/*
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* v6_flush_cache_range(start, end, flags)
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*
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* Flush a range of TLB entries in the specified 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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* - flags - vm_area_struct flags describing address space
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*
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* It is assumed that:
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* - we have a VIPT cache.
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*/
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ENTRY(v6_flush_user_cache_range)
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mov pc, lr
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/*
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* v6_coherent_kern_range(start,end)
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*
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* Ensure that the I and D caches are coherent within specified
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* region. This is typically used when code has been written to
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* a memory region, and will be executed.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*
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* It is assumed that:
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* - the Icache does not read data from the write buffer
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*/
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ENTRY(v6_coherent_kern_range)
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/* FALLTHROUGH */
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/*
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* v6_coherent_user_range(start,end)
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*
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* Ensure that the I and D caches are coherent within specified
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* region. This is typically used when code has been written to
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* a memory region, and will be executed.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*
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* It is assumed that:
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* - the Icache does not read data from the write buffer
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*/
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ENTRY(v6_coherent_user_range)
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UNWIND(.fnstart )
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#ifdef HARVARD_CACHE
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bic r0, r0, #CACHE_LINE_SIZE - 1
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1:
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USER( mcr p15, 0, r0, c7, c10, 1 ) @ clean D line
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add r0, r0, #CACHE_LINE_SIZE
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2:
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cmp r0, r1
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blo 1b
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#endif
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mov r0, #0
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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#ifndef CONFIG_ARM_ERRATA_411920
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mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
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#else
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b v6_flush_icache_all
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#endif
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#else
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mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB
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#endif
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mov pc, lr
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/*
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* Fault handling for the cache operation above. If the virtual address in r0
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* isn't mapped, just try the next page.
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*/
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9001:
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mov r0, r0, lsr #12
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mov r0, r0, lsl #12
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add r0, r0, #4096
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b 2b
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UNWIND(.fnend )
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ENDPROC(v6_coherent_user_range)
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ENDPROC(v6_coherent_kern_range)
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/*
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* v6_flush_kern_dcache_area(void *addr, size_t size)
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*
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* Ensure that the data held in the page kaddr is written back
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* to the page in question.
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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(v6_flush_kern_dcache_area)
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add r1, r0, r1
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
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#else
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mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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blo 1b
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#ifdef HARVARD_CACHE
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4
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#endif
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mov pc, lr
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/*
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* v6_dma_inv_range(start,end)
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*
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* Invalidate the data cache within the specified region; we will
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* be performing a DMA operation in this region and we want to
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* purge old data in the cache.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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v6_dma_inv_range:
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrb r2, [r0] @ read for ownership
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strb r2, [r0] @ write for ownership
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#endif
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tst r0, #D_CACHE_LINE_SIZE - 1
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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#ifdef HARVARD_CACHE
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mcrne p15, 0, r0, c7, c10, 1 @ clean D line
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#else
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mcrne p15, 0, r0, c7, c11, 1 @ clean unified line
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#endif
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tst r1, #D_CACHE_LINE_SIZE - 1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrneb r2, [r1, #-1] @ read for ownership
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strneb r2, [r1, #-1] @ write for ownership
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#endif
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bic r1, r1, #D_CACHE_LINE_SIZE - 1
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#ifdef HARVARD_CACHE
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mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D line
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#else
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mcrne p15, 0, r1, c7, c15, 1 @ clean & invalidate unified line
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#endif
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c6, 1 @ invalidate D line
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#else
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mcr p15, 0, r0, c7, c7, 1 @ invalidate unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrlo r2, [r0] @ read for ownership
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strlo r2, [r0] @ write for ownership
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#endif
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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mov pc, lr
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/*
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* v6_dma_clean_range(start,end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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v6_dma_clean_range:
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldr r2, [r0] @ read for ownership
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#endif
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c10, 1 @ clean D line
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#else
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mcr p15, 0, r0, c7, c11, 1 @ clean unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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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, c10, 4 @ drain write buffer
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mov pc, lr
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/*
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* v6_dma_flush_range(start,end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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ENTRY(v6_dma_flush_range)
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrb r2, [r0] @ read for ownership
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strb r2, [r0] @ write for ownership
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#endif
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
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#else
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mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrlob r2, [r0] @ read for ownership
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strlob r2, [r0] @ write for ownership
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#endif
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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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(v6_dma_map_area)
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add r1, r1, r0
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teq r2, #DMA_FROM_DEVICE
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beq v6_dma_inv_range
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#ifndef CONFIG_DMA_CACHE_RWFO
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b v6_dma_clean_range
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#else
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teq r2, #DMA_TO_DEVICE
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beq v6_dma_clean_range
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b v6_dma_flush_range
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#endif
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ENDPROC(v6_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(v6_dma_unmap_area)
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#ifndef CONFIG_DMA_CACHE_RWFO
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add r1, r1, r0
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teq r2, #DMA_TO_DEVICE
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bne v6_dma_inv_range
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#endif
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mov pc, lr
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ENDPROC(v6_dma_unmap_area)
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__INITDATA
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.type v6_cache_fns, #object
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ENTRY(v6_cache_fns)
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.long v6_flush_icache_all
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.long v6_flush_kern_cache_all
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.long v6_flush_user_cache_all
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.long v6_flush_user_cache_range
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.long v6_coherent_kern_range
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.long v6_coherent_user_range
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.long v6_flush_kern_dcache_area
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.long v6_dma_map_area
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.long v6_dma_unmap_area
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.long v6_dma_flush_range
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.size v6_cache_fns, . - v6_cache_fns
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