1#ifndef _M68K_PAGE_MM_H
2#define _M68K_PAGE_MM_H
3
4#ifndef __ASSEMBLY__
5
6#include <linux/compiler.h>
7#include <asm/module.h>
8
9#define get_user_page(vaddr)		__get_free_page(GFP_KERNEL)
10#define free_user_page(page, addr)	free_page(addr)
11
12/*
13 * We don't need to check for alignment etc.
14 */
15#ifdef CPU_M68040_OR_M68060_ONLY
16static inline void copy_page(void *to, void *from)
17{
18  unsigned long tmp;
19
20  __asm__ __volatile__("1:\t"
21		       ".chip 68040\n\t"
22		       "move16 %1@+,%0@+\n\t"
23		       "move16 %1@+,%0@+\n\t"
24		       ".chip 68k\n\t"
25		       "dbra  %2,1b\n\t"
26		       : "=a" (to), "=a" (from), "=d" (tmp)
27		       : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
28		       );
29}
30
31static inline void clear_page(void *page)
32{
33	unsigned long tmp;
34	unsigned long *sp = page;
35
36	*sp++ = 0;
37	*sp++ = 0;
38	*sp++ = 0;
39	*sp++ = 0;
40
41	__asm__ __volatile__("1:\t"
42			     ".chip 68040\n\t"
43			     "move16 %2@+,%0@+\n\t"
44			     ".chip 68k\n\t"
45			     "subqw  #8,%2\n\t"
46			     "subqw  #8,%2\n\t"
47			     "dbra   %1,1b\n\t"
48			     : "=a" (sp), "=d" (tmp)
49			     : "a" (page), "0" (sp),
50			       "1" ((PAGE_SIZE - 16) / 16 - 1));
51}
52
53#else
54#define clear_page(page)	memset((page), 0, PAGE_SIZE)
55#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
56#endif
57
58#define clear_user_page(addr, vaddr, page)	\
59	do {	clear_page(addr);		\
60		flush_dcache_page(page);	\
61	} while (0)
62#define copy_user_page(to, from, vaddr, page)	\
63	do {	copy_page(to, from);		\
64		flush_dcache_page(page);	\
65	} while (0)
66
67extern unsigned long m68k_memoffset;
68
69#ifndef CONFIG_SUN3
70
71#define WANT_PAGE_VIRTUAL
72
73static inline unsigned long ___pa(void *vaddr)
74{
75	unsigned long paddr;
76	asm (
77		"1:	addl #0,%0\n"
78		m68k_fixup(%c2, 1b+2)
79		: "=r" (paddr)
80		: "0" (vaddr), "i" (m68k_fixup_memoffset));
81	return paddr;
82}
83#define __pa(vaddr)	___pa((void *)(long)(vaddr))
84static inline void *__va(unsigned long paddr)
85{
86	void *vaddr;
87	asm (
88		"1:	subl #0,%0\n"
89		m68k_fixup(%c2, 1b+2)
90		: "=r" (vaddr)
91		: "0" (paddr), "i" (m68k_fixup_memoffset));
92	return vaddr;
93}
94
95#else	/* !CONFIG_SUN3 */
96/* This #define is a horrible hack to suppress lots of warnings. --m */
97#define __pa(x) ___pa((unsigned long)(x))
98static inline unsigned long ___pa(unsigned long x)
99{
100     if(x == 0)
101	  return 0;
102     if(x >= PAGE_OFFSET)
103        return (x-PAGE_OFFSET);
104     else
105        return (x+0x2000000);
106}
107
108static inline void *__va(unsigned long x)
109{
110     if(x == 0)
111	  return (void *)0;
112
113     if(x < 0x2000000)
114        return (void *)(x+PAGE_OFFSET);
115     else
116        return (void *)(x-0x2000000);
117}
118#endif	/* CONFIG_SUN3 */
119
120/*
121 * NOTE: virtual isn't really correct, actually it should be the offset into the
122 * memory node, but we have no highmem, so that works for now.
123 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
124 * of the shifts unnecessary.
125 */
126#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
127#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
128
129extern int m68k_virt_to_node_shift;
130
131#ifdef CONFIG_SINGLE_MEMORY_CHUNK
132#define __virt_to_node(addr)	(&pg_data_map[0])
133#else
134extern struct pglist_data *pg_data_table[];
135
136static inline __attribute_const__ int __virt_to_node_shift(void)
137{
138	int shift;
139
140	asm (
141		"1:	moveq	#0,%0\n"
142		m68k_fixup(%c1, 1b)
143		: "=d" (shift)
144		: "i" (m68k_fixup_vnode_shift));
145	return shift;
146}
147
148#define __virt_to_node(addr)	(pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
149#endif
150
151#define virt_to_page(addr) ({						\
152	pfn_to_page(virt_to_pfn(addr));					\
153})
154#define page_to_virt(page) ({						\
155	pfn_to_virt(page_to_pfn(page));					\
156})
157
158#define pfn_to_page(pfn) ({						\
159	unsigned long __pfn = (pfn);					\
160	struct pglist_data *pgdat;					\
161	pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));	\
162	pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);		\
163})
164#define page_to_pfn(_page) ({						\
165	const struct page *__p = (_page);				\
166	struct pglist_data *pgdat;					\
167	pgdat = &pg_data_map[page_to_nid(__p)];				\
168	((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;		\
169})
170
171#define virt_addr_valid(kaddr)	((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
172#define pfn_valid(pfn)		virt_addr_valid(pfn_to_virt(pfn))
173
174#endif /* __ASSEMBLY__ */
175
176#endif /* _M68K_PAGE_MM_H */
177