483 lines
13 KiB
ArmAsm
483 lines
13 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/mm/cache-v7.S
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*
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* Copyright (C) 2001 Deep Blue Solutions Ltd.
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* Copyright (C) 2005 ARM Ltd.
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*
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* This is the "shell" of the ARMv7 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/errno.h>
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#include <asm/unwind.h>
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#include <asm/hardware/cache-b15-rac.h>
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#include "proc-macros.S"
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.arch armv7-a
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#ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
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.globl icache_size
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.data
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.align 2
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icache_size:
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.long 64
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.text
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#endif
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/*
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* The secondary kernel init calls v7_flush_dcache_all before it enables
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* the L1; however, the L1 comes out of reset in an undefined state, so
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* the clean + invalidate performed by v7_flush_dcache_all causes a bunch
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* of cache lines with uninitialized data and uninitialized tags to get
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* written out to memory, which does really unpleasant things to the main
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* processor. We fix this by performing an invalidate, rather than a
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* clean + invalidate, before jumping into the kernel.
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*
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* This function needs to be called for both secondary cores startup and
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* primary core resume procedures.
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*/
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ENTRY(v7_invalidate_l1)
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mov r0, #0
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mcr p15, 2, r0, c0, c0, 0 @ select L1 data cache in CSSELR
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isb
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mrc p15, 1, r0, c0, c0, 0 @ read cache geometry from CCSIDR
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movw r3, #0x3ff
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and r3, r3, r0, lsr #3 @ 'Associativity' in CCSIDR[12:3]
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clz r1, r3 @ WayShift
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mov r2, #1
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mov r3, r3, lsl r1 @ NumWays-1 shifted into bits [31:...]
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movs r1, r2, lsl r1 @ #1 shifted left by same amount
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moveq r1, #1 @ r1 needs value > 0 even if only 1 way
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and r2, r0, #0x7
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add r2, r2, #4 @ SetShift
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1: movw ip, #0x7fff
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and r0, ip, r0, lsr #13 @ 'NumSets' in CCSIDR[27:13]
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2: mov ip, r0, lsl r2 @ NumSet << SetShift
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orr ip, ip, r3 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
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mcr p15, 0, ip, c7, c6, 2
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subs r0, r0, #1 @ Set--
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bpl 2b
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subs r3, r3, r1 @ Way--
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bcc 3f
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mrc p15, 1, r0, c0, c0, 0 @ re-read cache geometry from CCSIDR
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b 1b
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3: dsb st
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isb
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ret lr
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ENDPROC(v7_invalidate_l1)
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/*
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* v7_flush_icache_all()
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*
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* Flush the whole I-cache.
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*
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* Registers:
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* r0 - set to 0
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*/
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ENTRY(v7_flush_icache_all)
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mov r0, #0
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ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
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ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
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ret lr
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ENDPROC(v7_flush_icache_all)
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/*
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* v7_flush_dcache_louis()
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*
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* Flush the D-cache up to the Level of Unification Inner Shareable
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*
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* Corrupted registers: r0-r6, r9-r10
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*/
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ENTRY(v7_flush_dcache_louis)
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dmb @ ensure ordering with previous memory accesses
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mrc p15, 1, r0, c0, c0, 1 @ read clidr, r0 = clidr
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ALT_SMP(mov r3, r0, lsr #20) @ move LoUIS into position
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ALT_UP( mov r3, r0, lsr #26) @ move LoUU into position
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ands r3, r3, #7 << 1 @ extract LoU*2 field from clidr
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bne start_flush_levels @ LoU != 0, start flushing
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#ifdef CONFIG_ARM_ERRATA_643719
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ALT_SMP(mrc p15, 0, r2, c0, c0, 0) @ read main ID register
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ALT_UP( ret lr) @ LoUU is zero, so nothing to do
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movw r1, #:lower16:(0x410fc090 >> 4) @ ID of ARM Cortex A9 r0p?
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movt r1, #:upper16:(0x410fc090 >> 4)
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teq r1, r2, lsr #4 @ test for errata affected core and if so...
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moveq r3, #1 << 1 @ fix LoUIS value
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beq start_flush_levels @ start flushing cache levels
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#endif
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ret lr
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ENDPROC(v7_flush_dcache_louis)
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/*
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* v7_flush_dcache_all()
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*
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* Flush the whole D-cache.
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*
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* Corrupted registers: r0-r6, r9-r10
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*
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* - mm - mm_struct describing address space
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*/
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ENTRY(v7_flush_dcache_all)
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dmb @ ensure ordering with previous memory accesses
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mrc p15, 1, r0, c0, c0, 1 @ read clidr
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mov r3, r0, lsr #23 @ move LoC into position
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ands r3, r3, #7 << 1 @ extract LoC*2 from clidr
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beq finished @ if loc is 0, then no need to clean
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start_flush_levels:
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mov r10, #0 @ start clean at cache level 0
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flush_levels:
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add r2, r10, r10, lsr #1 @ work out 3x current cache level
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mov r1, r0, lsr r2 @ extract cache type bits from clidr
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and r1, r1, #7 @ mask of the bits for current cache only
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cmp r1, #2 @ see what cache we have at this level
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blt skip @ skip if no cache, or just i-cache
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#ifdef CONFIG_PREEMPTION
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save_and_disable_irqs_notrace r9 @ make cssr&csidr read atomic
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#endif
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mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
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isb @ isb to sych the new cssr&csidr
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mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
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#ifdef CONFIG_PREEMPTION
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restore_irqs_notrace r9
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#endif
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and r2, r1, #7 @ extract the length of the cache lines
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add r2, r2, #4 @ add 4 (line length offset)
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movw r4, #0x3ff
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ands r4, r4, r1, lsr #3 @ find maximum number on the way size
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clz r5, r4 @ find bit position of way size increment
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movw r6, #0x7fff
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and r1, r6, r1, lsr #13 @ extract max number of the index size
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mov r6, #1
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movne r4, r4, lsl r5 @ # of ways shifted into bits [31:...]
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movne r6, r6, lsl r5 @ 1 shifted left by same amount
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loop1:
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mov r9, r1 @ create working copy of max index
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loop2:
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mov r5, r9, lsl r2 @ factor set number into r5
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orr r5, r5, r4 @ factor way number into r5
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orr r5, r5, r10 @ factor cache level into r5
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mcr p15, 0, r5, c7, c14, 2 @ clean & invalidate by set/way
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subs r9, r9, #1 @ decrement the index
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bge loop2
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subs r4, r4, r6 @ decrement the way
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bcs loop1
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skip:
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add r10, r10, #2 @ increment cache number
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cmp r3, r10
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#ifdef CONFIG_ARM_ERRATA_814220
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dsb
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#endif
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bgt flush_levels
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finished:
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mov r10, #0 @ switch back to cache level 0
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mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
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dsb st
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isb
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ret lr
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ENDPROC(v7_flush_dcache_all)
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/*
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* v7_flush_cache_all()
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*
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* Flush the entire cache system.
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* The data cache flush is now achieved using atomic clean / invalidates
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* working outwards from L1 cache. This is done using Set/Way based cache
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* maintenance instructions.
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* The instruction cache can still be invalidated back to the point of
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* unification in a single instruction.
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*
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*/
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ENTRY(v7_flush_kern_cache_all)
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stmfd sp!, {r4-r6, r9-r10, lr}
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bl v7_flush_dcache_all
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mov r0, #0
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ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
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ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
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ldmfd sp!, {r4-r6, r9-r10, lr}
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ret lr
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ENDPROC(v7_flush_kern_cache_all)
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/*
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* v7_flush_kern_cache_louis(void)
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*
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* Flush the data cache up to Level of Unification Inner Shareable.
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* Invalidate the I-cache to the point of unification.
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*/
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ENTRY(v7_flush_kern_cache_louis)
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stmfd sp!, {r4-r6, r9-r10, lr}
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bl v7_flush_dcache_louis
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mov r0, #0
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ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
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ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
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ldmfd sp!, {r4-r6, r9-r10, lr}
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ret lr
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ENDPROC(v7_flush_kern_cache_louis)
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/*
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* v7_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(v7_flush_user_cache_all)
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/*FALLTHROUGH*/
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/*
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* v7_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(v7_flush_user_cache_range)
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ret lr
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ENDPROC(v7_flush_user_cache_all)
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ENDPROC(v7_flush_user_cache_range)
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/*
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* v7_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(v7_coherent_kern_range)
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/* FALLTHROUGH */
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/*
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* v7_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(v7_coherent_user_range)
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UNWIND(.fnstart )
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dcache_line_size r2, r3
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sub r3, r2, #1
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bic r12, r0, r3
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#ifdef CONFIG_ARM_ERRATA_764369
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ALT_SMP(W(dsb))
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ALT_UP(W(nop))
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#endif
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1:
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USER( mcr p15, 0, r12, c7, c11, 1 ) @ clean D line to the point of unification
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add r12, r12, r2
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cmp r12, r1
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blo 1b
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dsb ishst
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#ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
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ldr r3, =icache_size
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ldr r2, [r3, #0]
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#else
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icache_line_size r2, r3
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#endif
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sub r3, r2, #1
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bic r12, r0, r3
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2:
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USER( mcr p15, 0, r12, c7, c5, 1 ) @ invalidate I line
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add r12, r12, r2
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cmp r12, r1
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blo 2b
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mov r0, #0
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ALT_SMP(mcr p15, 0, r0, c7, c1, 6) @ invalidate BTB Inner Shareable
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ALT_UP(mcr p15, 0, r0, c7, c5, 6) @ invalidate BTB
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dsb ishst
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isb
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ret 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, fail with -EFAULT.
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*/
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9001:
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#ifdef CONFIG_ARM_ERRATA_775420
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dsb
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#endif
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mov r0, #-EFAULT
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ret lr
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UNWIND(.fnend )
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ENDPROC(v7_coherent_kern_range)
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ENDPROC(v7_coherent_user_range)
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/*
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* v7_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(v7_flush_kern_dcache_area)
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dcache_line_size r2, r3
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add r1, r0, r1
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sub r3, r2, #1
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bic r0, r0, r3
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#ifdef CONFIG_ARM_ERRATA_764369
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ALT_SMP(W(dsb))
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ALT_UP(W(nop))
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#endif
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1:
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mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line / unified line
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add r0, r0, r2
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cmp r0, r1
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blo 1b
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dsb st
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ret lr
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ENDPROC(v7_flush_kern_dcache_area)
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/*
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* v7_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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v7_dma_inv_range:
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dcache_line_size r2, r3
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sub r3, r2, #1
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tst r0, r3
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bic r0, r0, r3
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#ifdef CONFIG_ARM_ERRATA_764369
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ALT_SMP(W(dsb))
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ALT_UP(W(nop))
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#endif
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mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
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addne r0, r0, r2
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tst r1, r3
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bic r1, r1, r3
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mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D / U line
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cmp r0, r1
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1:
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mcrlo p15, 0, r0, c7, c6, 1 @ invalidate D / U line
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addlo r0, r0, r2
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cmplo r0, r1
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blo 1b
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dsb st
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ret lr
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ENDPROC(v7_dma_inv_range)
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/*
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* v7_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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v7_dma_clean_range:
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dcache_line_size r2, r3
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sub r3, r2, #1
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bic r0, r0, r3
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#ifdef CONFIG_ARM_ERRATA_764369
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ALT_SMP(W(dsb))
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ALT_UP(W(nop))
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#endif
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1:
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mcr p15, 0, r0, c7, c10, 1 @ clean D / U line
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add r0, r0, r2
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cmp r0, r1
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blo 1b
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dsb st
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ret lr
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ENDPROC(v7_dma_clean_range)
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/*
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* v7_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(v7_dma_flush_range)
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dcache_line_size r2, r3
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sub r3, r2, #1
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bic r0, r0, r3
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#ifdef CONFIG_ARM_ERRATA_764369
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ALT_SMP(W(dsb))
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ALT_UP(W(nop))
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#endif
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1:
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mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
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add r0, r0, r2
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cmp r0, r1
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blo 1b
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dsb st
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ret lr
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ENDPROC(v7_dma_flush_range)
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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(v7_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 v7_dma_inv_range
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b v7_dma_clean_range
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ENDPROC(v7_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(v7_dma_unmap_area)
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add r1, r1, r0
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teq r2, #DMA_TO_DEVICE
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bne v7_dma_inv_range
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ret lr
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ENDPROC(v7_dma_unmap_area)
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__INITDATA
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
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define_cache_functions v7
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/* The Broadcom Brahma-B15 read-ahead cache requires some modifications
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* to the v7_cache_fns, we only override the ones we need
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*/
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#ifndef CONFIG_CACHE_B15_RAC
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globl_equ b15_flush_kern_cache_all, v7_flush_kern_cache_all
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#endif
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globl_equ b15_flush_icache_all, v7_flush_icache_all
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globl_equ b15_flush_kern_cache_louis, v7_flush_kern_cache_louis
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globl_equ b15_flush_user_cache_all, v7_flush_user_cache_all
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globl_equ b15_flush_user_cache_range, v7_flush_user_cache_range
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globl_equ b15_coherent_kern_range, v7_coherent_kern_range
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globl_equ b15_coherent_user_range, v7_coherent_user_range
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globl_equ b15_flush_kern_dcache_area, v7_flush_kern_dcache_area
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globl_equ b15_dma_map_area, v7_dma_map_area
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globl_equ b15_dma_unmap_area, v7_dma_unmap_area
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globl_equ b15_dma_flush_range, v7_dma_flush_range
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define_cache_functions b15
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