1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_UNCACHED_H
3 #define __ASM_SH_UNCACHED_H
4
5 #include <linux/bug.h>
6
7 #ifdef CONFIG_UNCACHED_MAPPING
8 extern unsigned long cached_to_uncached;
9 extern unsigned long uncached_size;
10 extern unsigned long uncached_start, uncached_end;
11
12 extern int virt_addr_uncached(unsigned long kaddr);
13 extern void uncached_init(void);
14 extern void uncached_resize(unsigned long size);
15
16 /*
17 * Jump to uncached area.
18 * When handling TLB or caches, we need to do it from an uncached area.
19 */
20 #define jump_to_uncached() \
21 do { \
22 unsigned long __dummy; \
23 \
24 __asm__ __volatile__( \
25 "mova 1f, %0\n\t" \
26 "add %1, %0\n\t" \
27 "jmp @%0\n\t" \
28 " nop\n\t" \
29 ".balign 4\n" \
30 "1:" \
31 : "=&z" (__dummy) \
32 : "r" (cached_to_uncached)); \
33 } while (0)
34
35 /*
36 * Back to cached area.
37 */
38 #define back_to_cached() \
39 do { \
40 unsigned long __dummy; \
41 ctrl_barrier(); \
42 __asm__ __volatile__( \
43 "mov.l 1f, %0\n\t" \
44 "jmp @%0\n\t" \
45 " nop\n\t" \
46 ".balign 4\n" \
47 "1: .long 2f\n" \
48 "2:" \
49 : "=&r" (__dummy)); \
50 } while (0)
51 #else
52 #define virt_addr_uncached(kaddr) (0)
53 #define uncached_init() do { } while (0)
54 #define uncached_resize(size) BUG()
55 #define jump_to_uncached() do { } while (0)
56 #define back_to_cached() do { } while (0)
57 #endif
58
59 #endif /* __ASM_SH_UNCACHED_H */