1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _M68K_PAGE_MM_H
3#define _M68K_PAGE_MM_H
4
5#ifndef __ASSEMBLY__
6
7#include <linux/compiler.h>
8#include <asm/module.h>
9
10/*
11 * We don't need to check for alignment etc.
12 */
13#ifdef CPU_M68040_OR_M68060_ONLY
14static inline void copy_page(void *to, void *from)
15{
16	unsigned long tmp;
17
18	__asm__ __volatile__("1:\t"
19			     ".chip 68040\n\t"
20			     "move16 %1@+,%0@+\n\t"
21			     "move16 %1@+,%0@+\n\t"
22			     ".chip 68k\n\t"
23			     "dbra  %2,1b\n\t"
24			     : "=a" (to), "=a" (from), "=d" (tmp)
25			     : "0" (to), "1" (from), "2" (PAGE_SIZE / 32 - 1));
26}
27
28static inline void clear_page(void *page)
29{
30	unsigned long tmp;
31	unsigned long *sp = page;
32
33	*sp++ = 0;
34	*sp++ = 0;
35	*sp++ = 0;
36	*sp++ = 0;
37
38	__asm__ __volatile__("1:\t"
39			     ".chip 68040\n\t"
40			     "move16 %2@+,%0@+\n\t"
41			     ".chip 68k\n\t"
42			     "subqw  #8,%2\n\t"
43			     "subqw  #8,%2\n\t"
44			     "dbra   %1,1b\n\t"
45			     : "=a" (sp), "=d" (tmp)
46			     : "a" (page), "0" (sp),
47			       "1" ((PAGE_SIZE - 16) / 16 - 1));
48}
49
50#else
51#define clear_page(page)	memset((page), 0, PAGE_SIZE)
52#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
53#endif
54
55#define clear_user_page(addr, vaddr, page)	\
56	do {	clear_page(addr);		\
57		flush_dcache_page(page);	\
58	} while (0)
59#define copy_user_page(to, from, vaddr, page)	\
60	do {	copy_page(to, from);		\
61		flush_dcache_page(page);	\
62	} while (0)
63
64extern unsigned long m68k_memoffset;
65
66#ifndef CONFIG_SUN3
67
68#define WANT_PAGE_VIRTUAL
69
70static inline unsigned long ___pa(void *vaddr)
71{
72	unsigned long paddr;
73	asm (
74		"1:	addl #0,%0\n"
75		m68k_fixup(%c2, 1b+2)
76		: "=r" (paddr)
77		: "0" (vaddr), "i" (m68k_fixup_memoffset));
78	return paddr;
79}
80#define __pa(vaddr)	___pa((void *)(long)(vaddr))
81static inline void *__va(unsigned long paddr)
82{
83	void *vaddr;
84	asm (
85		"1:	subl #0,%0\n"
86		m68k_fixup(%c2, 1b+2)
87		: "=r" (vaddr)
88		: "0" (paddr), "i" (m68k_fixup_memoffset));
89	return vaddr;
90}
91
92#else	/* !CONFIG_SUN3 */
93/* This #define is a horrible hack to suppress lots of warnings. --m */
94#define __pa(x) ___pa((unsigned long)(x))
95static inline unsigned long ___pa(unsigned long x)
96{
97	if (x == 0)
98		return 0;
99	if (x >= PAGE_OFFSET)
100		return (x - PAGE_OFFSET);
101	else
102		return (x + 0x2000000);
103}
104
105static inline void *__va(unsigned long x)
106{
107	if (x == 0)
108		return (void *)0;
109
110	if (x < 0x2000000)
111		return (void *)(x + PAGE_OFFSET);
112	else
113		return (void *)(x - 0x2000000);
114}
115#endif	/* CONFIG_SUN3 */
116
117/*
118 * NOTE: virtual isn't really correct, actually it should be the offset into the
119 * memory node, but we have no highmem, so that works for now.
120 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
121 * of the shifts unnecessary.
122 */
123static inline unsigned long virt_to_pfn(const void *kaddr)
124{
125	return __pa(kaddr) >> PAGE_SHIFT;
126}
127
128static inline void *pfn_to_virt(unsigned long pfn)
129{
130	return __va(pfn << PAGE_SHIFT);
131}
132
133extern int m68k_virt_to_node_shift;
134
135#define virt_to_page(addr) ({						\
136	pfn_to_page(virt_to_pfn(addr));					\
137})
138#define page_to_virt(page) ({						\
139	pfn_to_virt(page_to_pfn(page));					\
140})
141
142#define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT)
143
144#define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
145#define pfn_valid(pfn)		virt_addr_valid(pfn_to_virt(pfn))
146
147#endif /* __ASSEMBLY__ */
148
149#endif /* _M68K_PAGE_MM_H */
150