79 lines
2.2 KiB
ArmAsm
79 lines
2.2 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/alternative.h>
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#include <asm/asm-uaccess.h>
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/*
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* dcache_line_size - get the safe D-cache line size across all CPUs
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*/
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.macro mydcache_line_size, reg, tmp
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//read_ctr \tmp
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mrs \tmp, ctr_el0
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ubfm \tmp, \tmp, #16, #19 // cache line size encoding
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mov \reg, #4 // bytes per word
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lsl \reg, \reg, \tmp // actual cache line size
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.endm
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/*
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* __inval_dcache_area(kaddr, size)
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*
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* Ensure that any D-cache lines for the interval [kaddr, kaddr+size)
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* are invalidated. Any partial lines at the ends of the interval are
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* also cleaned to PoC to prevent data loss.
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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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SYM_FUNC_START(__myinval_dcache_area)
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/* FALLTHROUGH */
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/*
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* __dma_inv_area(start, size)
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* - start - virtual start address of region
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* - size - size in question
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*/
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__mydma_inv_area:
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add x1, x1, x0
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mydcache_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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//ENDPIPROC(__myinval_dcache_area)
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//SYM_FUNC_END(__mydma_inv_area)
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SYM_FUNC_END(__myinval_dcache_area)
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