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