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c218bca74e
With system caches for the host OS or architected caches for guest OS we cannot easily guarantee that there are no dirty or stale cache lines for the areas of memory written by the kernel during boot with the MMU off (therefore non-cacheable accesses). This patch adds the necessary cache maintenance during boot and relaxes the booting requirements. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
256 lines
6.3 KiB
ArmAsm
256 lines
6.3 KiB
ArmAsm
/*
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* Cache maintenance
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*
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* Copyright (C) 2001 Deep Blue Solutions Ltd.
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* Copyright (C) 2012 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 program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 "proc-macros.S"
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/*
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* __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: x0-x7, x9-x11
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*/
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__flush_dcache_all:
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dsb sy // ensure ordering with previous memory accesses
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mrs x0, clidr_el1 // read clidr
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and x3, x0, #0x7000000 // extract loc from clidr
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lsr x3, x3, #23 // left align loc bit field
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cbz x3, finished // if loc is 0, then no need to clean
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mov x10, #0 // start clean at cache level 0
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loop1:
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add x2, x10, x10, lsr #1 // work out 3x current cache level
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lsr x1, x0, x2 // extract cache type bits from clidr
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and x1, x1, #7 // mask of the bits for current cache only
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cmp x1, #2 // see what cache we have at this level
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b.lt skip // skip if no cache, or just i-cache
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save_and_disable_irqs x9 // make CSSELR and CCSIDR access atomic
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msr csselr_el1, x10 // select current cache level in csselr
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isb // isb to sych the new cssr&csidr
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mrs x1, ccsidr_el1 // read the new ccsidr
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restore_irqs x9
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and x2, x1, #7 // extract the length of the cache lines
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add x2, x2, #4 // add 4 (line length offset)
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mov x4, #0x3ff
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and x4, x4, x1, lsr #3 // find maximum number on the way size
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clz w5, w4 // find bit position of way size increment
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mov x7, #0x7fff
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and x7, x7, x1, lsr #13 // extract max number of the index size
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loop2:
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mov x9, x4 // create working copy of max way size
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loop3:
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lsl x6, x9, x5
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orr x11, x10, x6 // factor way and cache number into x11
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lsl x6, x7, x2
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orr x11, x11, x6 // factor index number into x11
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dc cisw, x11 // clean & invalidate by set/way
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subs x9, x9, #1 // decrement the way
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b.ge loop3
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subs x7, x7, #1 // decrement the index
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b.ge loop2
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skip:
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add x10, x10, #2 // increment cache number
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cmp x3, x10
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b.gt loop1
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finished:
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mov x10, #0 // swith back to cache level 0
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msr csselr_el1, x10 // select current cache level in csselr
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dsb sy
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isb
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ret
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ENDPROC(__flush_dcache_all)
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/*
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* flush_cache_all()
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*
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* Flush the entire cache system. The data cache flush is now achieved
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* using atomic clean / invalidates working outwards from L1 cache. This
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* is done using Set/Way based cache maintainance instructions. The
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* 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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ENTRY(flush_cache_all)
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mov x12, lr
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bl __flush_dcache_all
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mov x0, #0
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ic ialluis // I+BTB cache invalidate
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ret x12
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ENDPROC(flush_cache_all)
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/*
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* flush_icache_range(start,end)
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*
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* Ensure that the I and D caches are coherent within specified region.
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* This is typically used when code has been written to a memory region,
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* 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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ENTRY(flush_icache_range)
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/* FALLTHROUGH */
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/*
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* __flush_cache_user_range(start,end)
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*
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* Ensure that the I and D caches are coherent within specified region.
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* This is typically used when code has been written to a memory region,
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* 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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ENTRY(__flush_cache_user_range)
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dcache_line_size x2, x3
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sub x3, x2, #1
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bic x4, x0, x3
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1:
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USER(9f, dc cvau, x4 ) // clean D line to PoU
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add x4, x4, x2
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cmp x4, x1
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b.lo 1b
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dsb sy
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icache_line_size x2, x3
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sub x3, x2, #1
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bic x4, x0, x3
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1:
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USER(9f, ic ivau, x4 ) // invalidate I line PoU
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add x4, x4, x2
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cmp x4, x1
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b.lo 1b
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9: // ignore any faulting cache operation
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dsb sy
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isb
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ret
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ENDPROC(flush_icache_range)
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ENDPROC(__flush_cache_user_range)
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/*
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* __flush_dcache_area(kaddr, size)
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*
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* Ensure that the data held in the page kaddr is written back to the
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* page in question.
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*
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* - kaddr - kernel address
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* - size - size in question
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*/
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ENTRY(__flush_dcache_area)
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dcache_line_size x2, x3
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add x1, x0, x1
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sub x3, x2, #1
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bic x0, x0, x3
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1: dc civac, x0 // clean & invalidate D line / unified line
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add x0, x0, x2
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cmp x0, x1
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b.lo 1b
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dsb sy
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ret
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ENDPROC(__flush_dcache_area)
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/*
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* __inval_cache_range(start, end)
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* - start - start address of region
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* - end - end address of region
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*/
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ENTRY(__inval_cache_range)
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/* FALLTHROUGH */
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/*
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* __dma_inv_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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__dma_inv_range:
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dcache_line_size x2, x3
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sub x3, x2, #1
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bic x0, x0, x3
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bic x1, x1, x3
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1: dc ivac, x0 // invalidate D / U line
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add x0, x0, x2
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cmp x0, x1
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b.lo 1b
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dsb sy
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ret
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ENDPROC(__inval_cache_range)
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ENDPROC(__dma_inv_range)
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/*
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* __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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__dma_clean_range:
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dcache_line_size x2, x3
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sub x3, x2, #1
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bic x0, x0, x3
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1: dc cvac, x0 // clean D / U line
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add x0, x0, x2
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cmp x0, x1
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b.lo 1b
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dsb sy
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ret
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ENDPROC(__dma_clean_range)
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/*
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* __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(__dma_flush_range)
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dcache_line_size x2, x3
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sub x3, x2, #1
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bic x0, x0, x3
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1: dc civac, x0 // clean & invalidate D / U line
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add x0, x0, x2
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cmp x0, x1
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b.lo 1b
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dsb sy
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ret
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ENDPROC(__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(__dma_map_area)
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add x1, x1, x0
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cmp w2, #DMA_FROM_DEVICE
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b.eq __dma_inv_range
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b __dma_clean_range
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ENDPROC(__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(__dma_unmap_area)
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add x1, x1, x0
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cmp w2, #DMA_TO_DEVICE
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b.ne __dma_inv_range
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ret
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ENDPROC(__dma_unmap_area)
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