350 lines
8.6 KiB
ArmAsm
350 lines
8.6 KiB
ArmAsm
/*
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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 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 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/unwind.h>
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#include "proc-macros.S"
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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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mov pc, lr
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ENDPROC(v7_flush_icache_all)
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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-r7, r9-r11 (r6 only in Thumb mode)
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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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ands r3, r0, #0x7000000 @ extract loc from clidr
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mov r3, r3, lsr #23 @ left align loc bit field
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beq finished @ if loc is 0, then no need to clean
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mov r10, #0 @ start clean at cache level 0
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loop1:
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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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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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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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ldr 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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ldr r7, =0x7fff
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ands r7, r7, r1, lsr #13 @ extract max number of the index size
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loop2:
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mov r9, r4 @ create working copy of max way size
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loop3:
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ARM( orr r11, r10, r9, lsl r5 ) @ factor way and cache number into r11
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THUMB( lsl r6, r9, r5 )
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THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
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ARM( orr r11, r11, r7, lsl r2 ) @ factor index number into r11
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THUMB( lsl r6, r7, r2 )
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THUMB( orr r11, r11, r6 ) @ factor index number into r11
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mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
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subs r9, r9, #1 @ decrement the way
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bge loop3
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subs r7, r7, #1 @ decrement the index
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bge loop2
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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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bgt loop1
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finished:
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mov r10, #0 @ swith 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
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isb
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mov pc, 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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ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} )
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THUMB( stmfd sp!, {r4-r7, r9-r11, 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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ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} )
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THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} )
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mov pc, lr
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ENDPROC(v7_flush_kern_cache_all)
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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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mov pc, 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
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icache_line_size r2, r3
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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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3:
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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
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isb
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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 r12, r12, lsr #12
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mov r12, r12, lsl #12
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add r12, r12, #4096
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b 3b
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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
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mov pc, 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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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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1:
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mcr p15, 0, r0, c7, c6, 1 @ 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
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mov pc, 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
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mov pc, 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
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mov pc, 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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mov pc, 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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