mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 22:24:11 +08:00
7b749aad1f
Commit 9385/2 introduced a few branches inside function prototypes when using CFI in order to deal with the situation where CFI inserts a few bytes of function information in front of the symbol. This is not good for older CPUs where every cycle counts. Commit 9386/2 alleviated the situation a bit by using aliases for the cache functions with identical signatures. This leaves the coherent cache flush functions *_coherent_kern_range() with these branches to the corresponing *_coherent_user_range() around, since their return type differ and they therefore cannot be aliased. Solve this by a simple ifdef so at least we can use fallthroughs when compiling without CFI enabled. Link: https://lore.kernel.org/linux-arm-kernel/Zi+e9M%2Ff5b%2FSto9H@shell.armlinux.org.uk/ Suggested-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
205 lines
4.8 KiB
ArmAsm
205 lines
4.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* linux/arch/arm/mm/cache-v4wt.S
|
|
*
|
|
* Copyright (C) 1997-2002 Russell king
|
|
*
|
|
* ARMv4 write through cache operations support.
|
|
*
|
|
* We assume that the write buffer is not enabled.
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <linux/cfi_types.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/page.h>
|
|
#include "proc-macros.S"
|
|
|
|
/*
|
|
* The size of one data cache line.
|
|
*/
|
|
#define CACHE_DLINESIZE 32
|
|
|
|
/*
|
|
* The number of data cache segments.
|
|
*/
|
|
#define CACHE_DSEGMENTS 8
|
|
|
|
/*
|
|
* The number of lines in a cache segment.
|
|
*/
|
|
#define CACHE_DENTRIES 64
|
|
|
|
/*
|
|
* This is the size at which it becomes more efficient to
|
|
* clean the whole cache, rather than using the individual
|
|
* cache line maintenance instructions.
|
|
*
|
|
* *** This needs benchmarking
|
|
*/
|
|
#define CACHE_DLIMIT 16384
|
|
|
|
/*
|
|
* flush_icache_all()
|
|
*
|
|
* Unconditionally clean and invalidate the entire icache.
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_flush_icache_all)
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
ret lr
|
|
SYM_FUNC_END(v4wt_flush_icache_all)
|
|
|
|
/*
|
|
* flush_user_cache_all()
|
|
*
|
|
* Invalidate all cache entries in a particular address
|
|
* space.
|
|
*/
|
|
SYM_FUNC_ALIAS(v4wt_flush_user_cache_all, v4wt_flush_kern_cache_all)
|
|
|
|
/*
|
|
* flush_kern_cache_all()
|
|
*
|
|
* Clean and invalidate the entire cache.
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_flush_kern_cache_all)
|
|
mov r2, #VM_EXEC
|
|
mov ip, #0
|
|
__flush_whole_cache:
|
|
tst r2, #VM_EXEC
|
|
mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
|
|
ret lr
|
|
SYM_FUNC_END(v4wt_flush_kern_cache_all)
|
|
|
|
/*
|
|
* flush_user_cache_range(start, end, flags)
|
|
*
|
|
* Clean and invalidate a range of cache entries in the specified
|
|
* address space.
|
|
*
|
|
* - start - start address (inclusive, page aligned)
|
|
* - end - end address (exclusive, page aligned)
|
|
* - flags - vma_area_struct flags describing address space
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_flush_user_cache_range)
|
|
sub r3, r1, r0 @ calculate total size
|
|
cmp r3, #CACHE_DLIMIT
|
|
bhs __flush_whole_cache
|
|
|
|
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
tst r2, #VM_EXEC
|
|
mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
ret lr
|
|
SYM_FUNC_END(v4wt_flush_user_cache_range)
|
|
|
|
/*
|
|
* coherent_kern_range(start, end)
|
|
*
|
|
* Ensure coherency between the Icache and the Dcache in the
|
|
* region described by start. If you have non-snooping
|
|
* Harvard caches, you need to implement this function.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_coherent_kern_range)
|
|
#ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
|
|
b v4wt_coherent_user_range
|
|
#endif
|
|
SYM_FUNC_END(v4wt_coherent_kern_range)
|
|
|
|
/*
|
|
* coherent_user_range(start, end)
|
|
*
|
|
* Ensure coherency between the Icache and the Dcache in the
|
|
* region described by start. If you have non-snooping
|
|
* Harvard caches, you need to implement this function.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_coherent_user_range)
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
1: mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
mov r0, #0
|
|
ret lr
|
|
SYM_FUNC_END(v4wt_coherent_user_range)
|
|
|
|
/*
|
|
* flush_kern_dcache_area(void *addr, size_t size)
|
|
*
|
|
* Ensure no D cache aliasing occurs, either with itself or
|
|
* the I cache
|
|
*
|
|
* - addr - kernel address
|
|
* - size - region size
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_flush_kern_dcache_area)
|
|
mov r2, #0
|
|
mcr p15, 0, r2, c7, c5, 0 @ invalidate I cache
|
|
add r1, r0, r1
|
|
b v4wt_dma_inv_range
|
|
SYM_FUNC_END(v4wt_flush_kern_dcache_area)
|
|
|
|
/*
|
|
* dma_inv_range(start, end)
|
|
*
|
|
* Invalidate (discard) the specified virtual address range.
|
|
* May not write back any entries. If 'start' or 'end'
|
|
* are not cache line aligned, those lines must be written
|
|
* back.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
v4wt_dma_inv_range:
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
ret lr
|
|
|
|
/*
|
|
* dma_flush_range(start, end)
|
|
*
|
|
* Clean and invalidate the specified virtual address range.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_dma_flush_range)
|
|
b v4wt_dma_inv_range
|
|
SYM_FUNC_END(v4wt_dma_flush_range)
|
|
|
|
/*
|
|
* dma_unmap_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_dma_unmap_area)
|
|
add r1, r1, r0
|
|
teq r2, #DMA_TO_DEVICE
|
|
bne v4wt_dma_inv_range
|
|
ret lr
|
|
SYM_FUNC_END(v4wt_dma_unmap_area)
|
|
|
|
/*
|
|
* dma_map_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
SYM_TYPED_FUNC_START(v4wt_dma_map_area)
|
|
ret lr
|
|
SYM_FUNC_END(v4wt_dma_map_area)
|