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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Cache maintenance
*
* Copyright (C) 2001 Deep Blue Solutions Ltd.
* Copyright (C) 2012 ARM Ltd.
*/
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/cpufeature.h>
#include <asm/alternative.h>
#include <asm/asm-uaccess.h>
/*
* caches_clean_inval_pou_macro(start,end) [fixup]
*
* Ensure that the I and D caches are coherent within specified region.
* This is typically used when code has been written to a memory region,
* and will be executed.
*
* - start - virtual start address of region
* - end - virtual end address of region
* - fixup - optional label to branch to on user fault
*/
.macro caches_clean_inval_pou_macro, fixup
alternative_if ARM64_HAS_CACHE_IDC
dsb ishst
b .Ldc_skip_\@
alternative_else_nop_endif
mov x2, x0
mov x3, x1
dcache_by_line_op cvau, ish, x2, x3, x4, x5, \fixup
.Ldc_skip_\@:
alternative_if ARM64_HAS_CACHE_DIC
isb
b .Lic_skip_\@
alternative_else_nop_endif
invalidate_icache_by_line x0, x1, x2, x3, \fixup
.Lic_skip_\@:
.endm
/*
* caches_clean_inval_pou(start,end)
*
* Ensure that the I and D caches are coherent within specified region.
* This is typically used when code has been written to a memory region,
* and will be executed.
*
* - start - virtual start address of region
* - end - virtual end address of region
*/
SYM_FUNC_START(caches_clean_inval_pou)
caches_clean_inval_pou_macro
ret
SYM_FUNC_END(caches_clean_inval_pou)
/*
* caches_clean_inval_user_pou(start,end)
*
* Ensure that the I and D caches are coherent within specified region.
* This is typically used when code has been written to a memory region,
* and will be executed.
*
* - start - virtual start address of region
* - end - virtual end address of region
*/
SYM_FUNC_START(caches_clean_inval_user_pou)
uaccess_ttbr0_enable x2, x3, x4
caches_clean_inval_pou_macro 2f
mov x0, xzr
1:
uaccess_ttbr0_disable x1, x2
ret
2:
mov x0, #-EFAULT
b 1b
SYM_FUNC_END(caches_clean_inval_user_pou)
/*
* icache_inval_pou(start,end)
*
* Ensure that the I cache is invalid within specified region.
*
* - start - virtual start address of region
* - end - virtual end address of region
*/
SYM_FUNC_START(icache_inval_pou)
alternative_if ARM64_HAS_CACHE_DIC
isb
ret
alternative_else_nop_endif
invalidate_icache_by_line x0, x1, x2, x3
ret
SYM_FUNC_END(icache_inval_pou)
/*
* dcache_clean_inval_poc(start, end)
*
* Ensure that any D-cache lines for the interval [start, end)
* are cleaned and invalidated to the PoC.
*
* - start - virtual start address of region
* - end - virtual end address of region
*/
SYM_FUNC_START(__pi_dcache_clean_inval_poc)
dcache_by_line_op civac, sy, x0, x1, x2, x3
ret
SYM_FUNC_END(__pi_dcache_clean_inval_poc)
SYM_FUNC_ALIAS(dcache_clean_inval_poc, __pi_dcache_clean_inval_poc)
/*
* dcache_clean_pou(start, end)
*
* Ensure that any D-cache lines for the interval [start, end)
* are cleaned to the PoU.
*
* - start - virtual start address of region
* - end - virtual end address of region
*/
SYM_FUNC_START(dcache_clean_pou)
alternative_if ARM64_HAS_CACHE_IDC
dsb ishst
ret
alternative_else_nop_endif
dcache_by_line_op cvau, ish, x0, x1, x2, x3
ret
SYM_FUNC_END(dcache_clean_pou)
/*
* dcache_inval_poc(start, end)
*
* Ensure that any D-cache lines for the interval [start, end)
* are invalidated. Any partial lines at the ends of the interval are
* also cleaned to PoC to prevent data loss.
*
* - start - kernel start address of region
* - end - kernel end address of region
*/
SYM_FUNC_START(__pi_dcache_inval_poc)
dcache_line_size x2, x3
sub x3, x2, #1
tst x1, x3 // end cache line aligned?
bic x1, x1, x3
b.eq 1f
dc civac, x1 // clean & invalidate D / U line
1: tst x0, x3 // start cache line aligned?
bic x0, x0, x3
b.eq 2f
dc civac, x0 // clean & invalidate D / U line
b 3f
2: dc ivac, x0 // invalidate D / U line
3: add x0, x0, x2
cmp x0, x1
b.lo 2b
dsb sy
ret
SYM_FUNC_END(__pi_dcache_inval_poc)
SYM_FUNC_ALIAS(dcache_inval_poc, __pi_dcache_inval_poc)
/*
* dcache_clean_poc(start, end)
*
* Ensure that any D-cache lines for the interval [start, end)
* are cleaned to the PoC.
*
* - start - virtual start address of region
* - end - virtual end address of region
*/
SYM_FUNC_START(__pi_dcache_clean_poc)
dcache_by_line_op cvac, sy, x0, x1, x2, x3
ret
SYM_FUNC_END(__pi_dcache_clean_poc)
SYM_FUNC_ALIAS(dcache_clean_poc, __pi_dcache_clean_poc)
/*
* dcache_clean_pop(start, end)
*
* Ensure that any D-cache lines for the interval [start, end)
* are cleaned to the PoP.
*
* - start - virtual start address of region
* - end - virtual end address of region
*/
SYM_FUNC_START(__pi_dcache_clean_pop)
alternative_if_not ARM64_HAS_DCPOP
b dcache_clean_poc
alternative_else_nop_endif
dcache_by_line_op cvap, sy, x0, x1, x2, x3
ret
SYM_FUNC_END(__pi_dcache_clean_pop)
SYM_FUNC_ALIAS(dcache_clean_pop, __pi_dcache_clean_pop)
/*
* __dma_flush_area(start, size)
*
* clean & invalidate D / U line
*
* - start - virtual start address of region
* - size - size in question
*/
SYM_FUNC_START(__pi___dma_flush_area)
add x1, x0, x1
dcache_by_line_op civac, sy, x0, x1, x2, x3
ret
SYM_FUNC_END(__pi___dma_flush_area)
SYM_FUNC_ALIAS(__dma_flush_area, __pi___dma_flush_area)
/*
* __dma_map_area(start, size, dir)
* - start - kernel virtual start address
* - size - size of region
* - dir - DMA direction
*/
SYM_FUNC_START(__pi___dma_map_area)
add x1, x0, x1
cmp w2, #DMA_FROM_DEVICE
b.eq __pi_dcache_inval_poc
b __pi_dcache_clean_poc
SYM_FUNC_END(__pi___dma_map_area)
SYM_FUNC_ALIAS(__dma_map_area, __pi___dma_map_area)
/*
* __dma_unmap_area(start, size, dir)
* - start - kernel virtual start address
* - size - size of region
* - dir - DMA direction
*/
SYM_FUNC_START(__pi___dma_unmap_area)
add x1, x0, x1
cmp w2, #DMA_TO_DEVICE
b.ne __pi_dcache_inval_poc
ret
SYM_FUNC_END(__pi___dma_unmap_area)
SYM_FUNC_ALIAS(__dma_unmap_area, __pi___dma_unmap_area)
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