From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/hexagon/include/asm/cacheflush.h | 83 +++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 arch/hexagon/include/asm/cacheflush.h (limited to 'arch/hexagon/include/asm/cacheflush.h') diff --git a/arch/hexagon/include/asm/cacheflush.h b/arch/hexagon/include/asm/cacheflush.h new file mode 100644 index 000000000..bfff514a8 --- /dev/null +++ b/arch/hexagon/include/asm/cacheflush.h @@ -0,0 +1,83 @@ +/* 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 + +/* 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 + +#endif -- cgit v1.2.3