1 /* 2 * Copyright (C) 2015 Regents of the University of California 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation, version 2. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #ifndef _ASM_RISCV_CACHEFLUSH_H 15 #define _ASM_RISCV_CACHEFLUSH_H 16 17 #include <asm-generic/cacheflush.h> 18 19 #undef flush_icache_range 20 #undef flush_icache_user_range 21 #undef flush_dcache_page 22 23 static inline void local_flush_icache_all(void) 24 { 25 asm volatile ("fence.i" ::: "memory"); 26 } 27 28 #define PG_dcache_clean PG_arch_1 29 30 static inline void flush_dcache_page(struct page *page) 31 { 32 if (test_bit(PG_dcache_clean, &page->flags)) 33 clear_bit(PG_dcache_clean, &page->flags); 34 } 35 36 /* 37 * RISC-V doesn't have an instruction to flush parts of the instruction cache, 38 * so instead we just flush the whole thing. 39 */ 40 #define flush_icache_range(start, end) flush_icache_all() 41 #define flush_icache_user_range(vma, pg, addr, len) flush_icache_all() 42 43 #ifndef CONFIG_SMP 44 45 #define flush_icache_all() local_flush_icache_all() 46 #define flush_icache_mm(mm, local) flush_icache_all() 47 48 #else /* CONFIG_SMP */ 49 50 #define flush_icache_all() sbi_remote_fence_i(0) 51 void flush_icache_mm(struct mm_struct *mm, bool local); 52 53 #endif /* CONFIG_SMP */ 54 55 /* 56 * Bits in sys_riscv_flush_icache()'s flags argument. 57 */ 58 #define SYS_RISCV_FLUSH_ICACHE_LOCAL 1UL 59 #define SYS_RISCV_FLUSH_ICACHE_ALL (SYS_RISCV_FLUSH_ICACHE_LOCAL) 60 61 #endif /* _ASM_RISCV_CACHEFLUSH_H */ 62