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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
* et al.
*/
#ifndef __ASM_CACHEFLUSH_H
#define __ASM_CACHEFLUSH_H
#include <linux/mm.h>
/*
* Helper function for flushing or invalidating entire pages from data
* and instruction caches. SMP needs a little extra work, since we need
* to flush the pages on all cpus.
*/
extern void local_dcache_page_flush(struct page *page);
extern void local_icache_page_inv(struct page *page);
/*
* Data cache flushing always happen on the local cpu. Instruction cache
* invalidations need to be broadcasted to all other cpu in the system in
* case of SMP configurations.
*/
#ifndef CONFIG_SMP
#define dcache_page_flush(page) local_dcache_page_flush(page)
#define icache_page_inv(page) local_icache_page_inv(page)
#else /* CONFIG_SMP */
#define dcache_page_flush(page) local_dcache_page_flush(page)
#define icache_page_inv(page) smp_icache_page_inv(page)
extern void smp_icache_page_inv(struct page *page);
#endif /* CONFIG_SMP */
/*
* Synchronizes caches. Whenever a cpu writes executable code to memory, this
* should be called to make sure the processor sees the newly written code.
*/
static inline void sync_icache_dcache(struct page *page)
{
if (!IS_ENABLED(CONFIG_DCACHE_WRITETHROUGH))
dcache_page_flush(page);
icache_page_inv(page);
}
/*
* Pages with this bit set need not be flushed/invalidated, since
* they have not changed since last flush. New pages start with
* PG_arch_1 not set and are therefore dirty by default.
*/
#define PG_dc_clean PG_arch_1
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
static inline void flush_dcache_page(struct page *page)
{
clear_bit(PG_dc_clean, &page->flags);
}
/*
* Other interfaces are not required since we do not have virtually
* indexed or tagged caches. So we can use the default here.
*/
#define flush_cache_all() do { } while (0)
#define flush_cache_mm(mm) do { } while (0)
#define flush_cache_dup_mm(mm) do { } while (0)
#define flush_cache_range(vma, start, end) do { } while (0)
#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
#define flush_dcache_mmap_lock(mapping) do { } while (0)
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
#define flush_icache_range(start, end) do { } while (0)
#define flush_icache_page(vma, pg) do { } while (0)
#define flush_icache_user_range(vma, pg, adr, len) do { } while (0)
#define flush_cache_vmap(start, end) do { } while (0)
#define flush_cache_vunmap(start, end) do { } while (0)
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
do { \
memcpy(dst, src, len); \
if (vma->vm_flags & VM_EXEC) \
sync_icache_dcache(page); \
} while (0)
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
memcpy(dst, src, len)
#endif /* __ASM_CACHEFLUSH_H */