mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-26 20:44:32 +08:00
a9ff696160
Making virt_to_pfn() a static inline taking a strongly typed (const void *) makes the contract of a passing a pointer of that type to the function explicit and exposes any misuse of the macro virt_to_pfn() acting polymorphic and accepting many types such as (void *), (unitptr_t) or (unsigned long) as arguments without warnings. Doing this is a bit intrusive: virt_to_pfn() requires PHYS_PFN_OFFSET and PAGE_SHIFT to be defined, and this is defined in <asm/page.h>, so this must be included *before* <asm/memory.h>. The use of macros were obscuring the unclear inclusion order here, as the macros would eventually be resolved, but a static inline like this cannot be compiled with unresolved macros. The naive solution to include <asm/page.h> at the top of <asm/memory.h> does not work, because <asm/memory.h> sometimes includes <asm/page.h> at the end of itself, which would create a confusing inclusion loop. So instead, take the approach to always unconditionally include <asm/page.h> at the end of <asm/memory.h> arch/arm uses <asm/memory.h> explicitly in a lot of places, however it turns out that if we just unconditionally include <asm/memory.h> into <asm/page.h> and switch all inclusions of <asm/memory.h> to <asm/page.h> instead, we enforce the right order and <asm/memory.h> will always have access to the definitions. Put an inclusion guard in place making it impossible to include <asm/memory.h> explicitly. Link: https://lore.kernel.org/linux-mm/20220701160004.2ffff4e5ab59a55499f4c736@linux-foundation.org/ Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
259 lines
6.0 KiB
ArmAsm
259 lines
6.0 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* linux/arch/arm/mm/cache-v4wb.S
|
|
*
|
|
* Copyright (C) 1997-2002 Russell king
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.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 total size of the data cache.
|
|
*/
|
|
#if defined(CONFIG_CPU_SA110)
|
|
# define CACHE_DSIZE 16384
|
|
#elif defined(CONFIG_CPU_SA1100)
|
|
# define CACHE_DSIZE 8192
|
|
#else
|
|
# error Unknown cache size
|
|
#endif
|
|
|
|
/*
|
|
* This is the size at which it becomes more efficient to
|
|
* clean the whole cache, rather than using the individual
|
|
* cache line maintenance instructions.
|
|
*
|
|
* Size Clean (ticks) Dirty (ticks)
|
|
* 4096 21 20 21 53 55 54
|
|
* 8192 40 41 40 106 100 102
|
|
* 16384 77 77 76 140 140 138
|
|
* 32768 150 149 150 214 216 212 <---
|
|
* 65536 296 297 296 351 358 361
|
|
* 131072 591 591 591 656 657 651
|
|
* Whole 132 136 132 221 217 207 <---
|
|
*/
|
|
#define CACHE_DLIMIT (CACHE_DSIZE * 4)
|
|
|
|
.data
|
|
.align 2
|
|
flush_base:
|
|
.long FLUSH_BASE
|
|
.text
|
|
|
|
/*
|
|
* flush_icache_all()
|
|
*
|
|
* Unconditionally clean and invalidate the entire icache.
|
|
*/
|
|
ENTRY(v4wb_flush_icache_all)
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
ret lr
|
|
ENDPROC(v4wb_flush_icache_all)
|
|
|
|
/*
|
|
* flush_user_cache_all()
|
|
*
|
|
* Clean and invalidate all cache entries in a particular address
|
|
* space.
|
|
*/
|
|
ENTRY(v4wb_flush_user_cache_all)
|
|
/* FALLTHROUGH */
|
|
/*
|
|
* flush_kern_cache_all()
|
|
*
|
|
* Clean and invalidate the entire cache.
|
|
*/
|
|
ENTRY(v4wb_flush_kern_cache_all)
|
|
mov ip, #0
|
|
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
__flush_whole_cache:
|
|
ldr r3, =flush_base
|
|
ldr r1, [r3, #0]
|
|
eor r1, r1, #CACHE_DSIZE
|
|
str r1, [r3, #0]
|
|
add r2, r1, #CACHE_DSIZE
|
|
1: ldr r3, [r1], #32
|
|
cmp r1, r2
|
|
blo 1b
|
|
#ifdef FLUSH_BASE_MINICACHE
|
|
add r2, r2, #FLUSH_BASE_MINICACHE - FLUSH_BASE
|
|
sub r1, r2, #512 @ only 512 bytes
|
|
1: ldr r3, [r1], #32
|
|
cmp r1, r2
|
|
blo 1b
|
|
#endif
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain write buffer
|
|
ret lr
|
|
|
|
/*
|
|
* flush_user_cache_range(start, end, flags)
|
|
*
|
|
* 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(v4wb_flush_user_cache_range)
|
|
mov ip, #0
|
|
sub r3, r1, r0 @ calculate total size
|
|
tst r2, #VM_EXEC @ executable region?
|
|
mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
|
|
cmp r3, #CACHE_DLIMIT @ total size >= limit?
|
|
bhs __flush_whole_cache @ flush whole D cache
|
|
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
tst r2, #VM_EXEC
|
|
mcrne p15, 0, ip, c7, c10, 4 @ drain write buffer
|
|
ret 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(v4wb_flush_kern_dcache_area)
|
|
add r1, r0, r1
|
|
/* fall through */
|
|
|
|
/*
|
|
* 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(v4wb_coherent_kern_range)
|
|
/* fall through */
|
|
|
|
/*
|
|
* 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(v4wb_coherent_user_range)
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
ret lr
|
|
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
v4wb_dma_inv_range:
|
|
tst r0, #CACHE_DLINESIZE - 1
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
tst r1, #CACHE_DLINESIZE - 1
|
|
mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
|
|
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
|
|
ret lr
|
|
|
|
/*
|
|
* dma_clean_range(start, end)
|
|
*
|
|
* Clean (write back) the specified virtual address range.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
v4wb_dma_clean_range:
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
|
|
ret lr
|
|
|
|
/*
|
|
* dma_flush_range(start, end)
|
|
*
|
|
* Clean and invalidate the specified virtual address range.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*
|
|
* This is actually the same as v4wb_coherent_kern_range()
|
|
*/
|
|
.globl v4wb_dma_flush_range
|
|
.set v4wb_dma_flush_range, v4wb_coherent_kern_range
|
|
|
|
/*
|
|
* dma_map_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
ENTRY(v4wb_dma_map_area)
|
|
add r1, r1, r0
|
|
cmp r2, #DMA_TO_DEVICE
|
|
beq v4wb_dma_clean_range
|
|
bcs v4wb_dma_inv_range
|
|
b v4wb_dma_flush_range
|
|
ENDPROC(v4wb_dma_map_area)
|
|
|
|
/*
|
|
* dma_unmap_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
ENTRY(v4wb_dma_unmap_area)
|
|
ret lr
|
|
ENDPROC(v4wb_dma_unmap_area)
|
|
|
|
.globl v4wb_flush_kern_cache_louis
|
|
.equ v4wb_flush_kern_cache_louis, v4wb_flush_kern_cache_all
|
|
|
|
__INITDATA
|
|
|
|
@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
|
|
define_cache_functions v4wb
|