/* 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); } #define flush_icache_user_page(vma, page, addr, len) \ do { \ if (vma->vm_flags & VM_EXEC) \ sync_icache_dcache(page); \ } while (0) #include <asm-generic/cacheflush.h> #endif /* __ASM_CACHEFLUSH_H */