/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Cache flush operations for the Hexagon architecture
*
* Copyright ( c ) 2010 - 2011 , The Linux Foundation . All rights reserved .
*/
#ifndef _ASM_CACHEFLUSH_H
#define _ASM_CACHEFLUSH_H
#include <linux/mm_types.h>
/* Cache flushing:
*
* - flush_cache_all ( ) flushes entire cache
* - flush_cache_mm ( mm ) flushes the specified mm context ' s cache lines
* - flush_cache_page ( mm , vmaddr , pfn ) flushes a single page
* - flush_cache_range ( vma , start , end ) flushes a range of pages
* - flush_icache_range ( start , end ) flush a range of instructions
* - flush_dcache_page ( pg ) flushes ( wback & invalidates ) a page for dcache
* - flush_icache_pages ( vma , pg , nr ) flushes ( invalidates ) nr pages for icache
*
* Need to doublecheck which one is really needed for ptrace stuff to work .
*/
#define LINESIZE 32
#define LINEBITS 5
/*
* Flush Dcache range through current map .
*/
extern void flush_dcache_range(unsigned long start, unsigned long end);
#define flush_dcache_range flush_dcache_range
/*
* Flush Icache range through current map .
*/
extern void flush_icache_range(unsigned long start, unsigned long end);
#define flush_icache_range flush_icache_range
/*
* Memory - management related flushes are there to ensure in non - physically
* indexed cache schemes that stale lines belonging to a given ASID aren ' t
* in the cache to confuse things . The prototype Hexagon Virtual Machine
* only uses a single ASID for all user - mode maps , which should
* mean that they aren ' t necessary . A brute - force , flush - everything
* implementation , with the name xxxxx_hexagon ( ) is present in
* arch / hexagon / mm / cache . c , but let ' s not wire it up until we know
* it is needed .
*/
extern void flush_cache_all_hexagon(void );
/*
* This may or may not ever have to be non - null , depending on the
* virtual machine MMU . For a native kernel , it ' s definitiely a no - op
*
* This is also the place where deferred cache coherency stuff seems
* to happen , classically . . . but instead we do it like ia64 and
* clean the cache when the PTE is set .
*
*/
static inline void update_mmu_cache_range(struct vm_fault *vmf,
struct vm_area_struct *vma, unsigned long address,
pte_t *ptep, unsigned int nr)
{
/* generic_ptrace_pokedata doesn't wind up here, does it? */
}
#define update_mmu_cache(vma, addr, ptep) \
update_mmu_cache_range(NULL, vma, addr, ptep, 1 )
void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long vaddr, void *dst, void *src, int len);
#define copy_to_user_page copy_to_user_page
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
memcpy(dst, src, len)
extern void hexagon_inv_dcache_range(unsigned long start, unsigned long end);
extern void hexagon_clean_dcache_range(unsigned long start, unsigned long end);
#include <asm -generic/cacheflush.h>
#endif
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(vorverarbeitet am 2026-10-11)
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