202 lines
4.5 KiB
ArmAsm
202 lines
4.5 KiB
ArmAsm
/*
|
|
* linux/arch/arm/mm/cache-v4wt.S
|
|
*
|
|
* Copyright (C) 1997-2002 Russell king
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* ARMv4 write through cache operations support.
|
|
*
|
|
* We assume that the write buffer is not enabled.
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.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.
|
|
*/
|
|
ENTRY(v4wt_flush_icache_all)
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
mov pc, lr
|
|
ENDPROC(v4wt_flush_icache_all)
|
|
|
|
/*
|
|
* flush_user_cache_all()
|
|
*
|
|
* Invalidate all cache entries in a particular address
|
|
* space.
|
|
*/
|
|
ENTRY(v4wt_flush_user_cache_all)
|
|
/* FALLTHROUGH */
|
|
/*
|
|
* flush_kern_cache_all()
|
|
*
|
|
* Clean and invalidate the entire cache.
|
|
*/
|
|
ENTRY(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
|
|
mov pc, lr
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
ENTRY(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
|
|
mov pc, lr
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
ENTRY(v4wt_coherent_kern_range)
|
|
/* FALLTRHOUGH */
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
ENTRY(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 pc, lr
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
ENTRY(v4wt_flush_kern_dcache_area)
|
|
mov r2, #0
|
|
mcr p15, 0, r2, c7, c5, 0 @ invalidate I cache
|
|
add r1, r0, r1
|
|
/* fallthrough */
|
|
|
|
/*
|
|
* 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
|
|
mov pc, lr
|
|
|
|
/*
|
|
* dma_flush_range(start, end)
|
|
*
|
|
* Clean and invalidate the specified virtual address range.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
.globl v4wt_dma_flush_range
|
|
.equ v4wt_dma_flush_range, v4wt_dma_inv_range
|
|
|
|
/*
|
|
* dma_unmap_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
ENTRY(v4wt_dma_unmap_area)
|
|
add r1, r1, r0
|
|
teq r2, #DMA_TO_DEVICE
|
|
bne v4wt_dma_inv_range
|
|
/* FALLTHROUGH */
|
|
|
|
/*
|
|
* dma_map_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
ENTRY(v4wt_dma_map_area)
|
|
mov pc, lr
|
|
ENDPROC(v4wt_dma_unmap_area)
|
|
ENDPROC(v4wt_dma_map_area)
|
|
|
|
__INITDATA
|
|
|
|
@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
|
|
define_cache_functions v4wt
|