1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * OpenRISC Linux
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
7 * declaration.
8 *
9 * OpenRISC implementation:
10 * Copyright (C) Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
11 * et al.
12 */
13
14 #ifndef __ASM_CACHEFLUSH_H
15 #define __ASM_CACHEFLUSH_H
16
17 #include <linux/mm.h>
18
19 /*
20 * Helper function for flushing or invalidating entire pages from data
21 * and instruction caches. SMP needs a little extra work, since we need
22 * to flush the pages on all cpus.
23 */
24 extern void local_dcache_page_flush(struct page *page);
25 extern void local_icache_page_inv(struct page *page);
26
27 /*
28 * Data cache flushing always happen on the local cpu. Instruction cache
29 * invalidations need to be broadcasted to all other cpu in the system in
30 * case of SMP configurations.
31 */
32 #ifndef CONFIG_SMP
33 #define dcache_page_flush(page) local_dcache_page_flush(page)
34 #define icache_page_inv(page) local_icache_page_inv(page)
35 #else /* CONFIG_SMP */
36 #define dcache_page_flush(page) local_dcache_page_flush(page)
37 #define icache_page_inv(page) smp_icache_page_inv(page)
38 extern void smp_icache_page_inv(struct page *page);
39 #endif /* CONFIG_SMP */
40
41 /*
42 * Synchronizes caches. Whenever a cpu writes executable code to memory, this
43 * should be called to make sure the processor sees the newly written code.
44 */
45 static inline void sync_icache_dcache(struct page *page)
46 {
47 if (!IS_ENABLED(CONFIG_DCACHE_WRITETHROUGH))
48 dcache_page_flush(page);
49 icache_page_inv(page);
50 }
51
52 /*
53 * Pages with this bit set need not be flushed/invalidated, since
54 * they have not changed since last flush. New pages start with
55 * PG_arch_1 not set and are therefore dirty by default.
56 */
57 #define PG_dc_clean PG_arch_1
58
59 static inline void flush_dcache_folio(struct folio *folio)
60 {
61 clear_bit(PG_dc_clean, &folio->flags);
62 }
63 #define flush_dcache_folio flush_dcache_folio
64
65 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
66 static inline void flush_dcache_page(struct page *page)
67 {
68 flush_dcache_folio(page_folio(page));
69 }
70
71 #define flush_icache_user_page(vma, page, addr, len) \
72 do { \
73 if (vma->vm_flags & VM_EXEC) \
74 sync_icache_dcache(page); \
75 } while (0)
76
77 #include <asm-generic/cacheflush.h>
78
79 #endif /* __ASM_CACHEFLUSH_H */
80
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