Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _M68K_CACHEFLUSH_H
2#define _M68K_CACHEFLUSH_H
3
4#include <linux/mm.h>
5
6/* cache code */
7#define FLUSH_I_AND_D (0x00000808)
8#define FLUSH_I (0x00000008)
9
10/*
11 * Cache handling functions
12 */
13
14static inline void flush_icache(void)
15{
16 if (CPU_IS_040_OR_060)
17 asm volatile ( "nop\n"
18 " .chip 68040\n"
19 " cpusha %bc\n"
20 " .chip 68k");
21 else {
22 unsigned long tmp;
23 asm volatile ( "movec %%cacr,%0\n"
24 " or.w %1,%0\n"
25 " movec %0,%%cacr"
26 : "=&d" (tmp)
27 : "id" (FLUSH_I));
28 }
29}
30
31/*
32 * invalidate the cache for the specified memory range.
33 * It starts at the physical address specified for
34 * the given number of bytes.
35 */
36extern void cache_clear(unsigned long paddr, int len);
37/*
38 * push any dirty cache in the specified memory range.
39 * It starts at the physical address specified for
40 * the given number of bytes.
41 */
42extern void cache_push(unsigned long paddr, int len);
43
44/*
45 * push and invalidate pages in the specified user virtual
46 * memory range.
47 */
48extern void cache_push_v(unsigned long vaddr, int len);
49
50/* This is needed whenever the virtual mapping of the current
51 process changes. */
52#define __flush_cache_all() \
53({ \
54 if (CPU_IS_040_OR_060) \
55 __asm__ __volatile__("nop\n\t" \
56 ".chip 68040\n\t" \
57 "cpusha %dc\n\t" \
58 ".chip 68k"); \
59 else { \
60 unsigned long _tmp; \
61 __asm__ __volatile__("movec %%cacr,%0\n\t" \
62 "orw %1,%0\n\t" \
63 "movec %0,%%cacr" \
64 : "=&d" (_tmp) \
65 : "di" (FLUSH_I_AND_D)); \
66 } \
67})
68
69#define __flush_cache_030() \
70({ \
71 if (CPU_IS_020_OR_030) { \
72 unsigned long _tmp; \
73 __asm__ __volatile__("movec %%cacr,%0\n\t" \
74 "orw %1,%0\n\t" \
75 "movec %0,%%cacr" \
76 : "=&d" (_tmp) \
77 : "di" (FLUSH_I_AND_D)); \
78 } \
79})
80
81#define flush_cache_all() __flush_cache_all()
82
83#define flush_cache_vmap(start, end) flush_cache_all()
84#define flush_cache_vunmap(start, end) flush_cache_all()
85
86static inline void flush_cache_mm(struct mm_struct *mm)
87{
88 if (mm == current->mm)
89 __flush_cache_030();
90}
91
92/* flush_cache_range/flush_cache_page must be macros to avoid
93 a dependency on linux/mm.h, which includes this file... */
94static inline void flush_cache_range(struct vm_area_struct *vma,
95 unsigned long start,
96 unsigned long end)
97{
98 if (vma->vm_mm == current->mm)
99 __flush_cache_030();
100}
101
102static inline void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
103{
104 if (vma->vm_mm == current->mm)
105 __flush_cache_030();
106}
107
108
109/* Push the page at kernel virtual address and clear the icache */
110/* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
111static inline void __flush_page_to_ram(void *vaddr)
112{
113 if (CPU_IS_040_OR_060) {
114 __asm__ __volatile__("nop\n\t"
115 ".chip 68040\n\t"
116 "cpushp %%bc,(%0)\n\t"
117 ".chip 68k"
118 : : "a" (__pa(vaddr)));
119 } else {
120 unsigned long _tmp;
121 __asm__ __volatile__("movec %%cacr,%0\n\t"
122 "orw %1,%0\n\t"
123 "movec %0,%%cacr"
124 : "=&d" (_tmp)
125 : "di" (FLUSH_I));
126 }
127}
128
129#define flush_dcache_page(page) __flush_page_to_ram(page_address(page))
130#define flush_dcache_mmap_lock(mapping) do { } while (0)
131#define flush_dcache_mmap_unlock(mapping) do { } while (0)
132#define flush_icache_page(vma, page) __flush_page_to_ram(page_address(page))
133
134extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
135 unsigned long addr, int len);
136extern void flush_icache_range(unsigned long address, unsigned long endaddr);
137
138static inline void copy_to_user_page(struct vm_area_struct *vma,
139 struct page *page, unsigned long vaddr,
140 void *dst, void *src, int len)
141{
142 flush_cache_page(vma, vaddr, page_to_pfn(page));
143 memcpy(dst, src, len);
144 flush_icache_user_range(vma, page, vaddr, len);
145}
146static inline void copy_from_user_page(struct vm_area_struct *vma,
147 struct page *page, unsigned long vaddr,
148 void *dst, void *src, int len)
149{
150 flush_cache_page(vma, vaddr, page_to_pfn(page));
151 memcpy(dst, src, len);
152}
153
154#endif /* _M68K_CACHEFLUSH_H */