201 строка
4.4 KiB
ArmAsm
201 строка
4.4 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/errno.h>
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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/cpufeature.h>
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#include <asm/alternative.h>
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#include "proc-macros.S"
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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 ish
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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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dsb ish
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isb
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mov x0, #0
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ret
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9:
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mov x0, #-EFAULT
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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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tst x1, x3 // end cache line aligned?
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bic x1, x1, x3
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b.eq 1f
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dc civac, x1 // clean & invalidate D / U line
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1: tst x0, x3 // start cache line aligned?
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bic x0, x0, x3
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b.eq 2f
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dc civac, x0 // clean & invalidate D / U line
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b 3f
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2: dc ivac, x0 // invalidate D / U line
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3: add x0, x0, x2
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cmp x0, x1
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b.lo 2b
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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:
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alternative_if_not ARM64_WORKAROUND_CLEAN_CACHE
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dc cvac, x0
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alternative_else
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dc civac, x0
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alternative_endif
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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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