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
local_flush_icache_all(void)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
flush_dcache_page(struct page * page)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(NULL)
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
