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
8extern unsigned long cached_to_uncached;
9extern unsigned long uncached_size;
10extern unsigned long uncached_start, uncached_end;
11
12extern int virt_addr_uncached(unsigned long kaddr);
13extern void uncached_init(void);
14extern 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()			\
21do {						\
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()				\
39do {							\
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 */
60