Linux kernel mirror (for testing)
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linux
1#ifndef _PARISC_CACHEFLUSH_H
2#define _PARISC_CACHEFLUSH_H
3
4#include <linux/config.h>
5#include <linux/mm.h>
6#include <asm/cache.h> /* for flush_user_dcache_range_asm() proto */
7
8/* The usual comment is "Caches aren't brain-dead on the <architecture>".
9 * Unfortunately, that doesn't apply to PA-RISC. */
10
11/* Cache flush operations */
12
13#ifdef CONFIG_SMP
14#define flush_cache_mm(mm) flush_cache_all()
15#else
16#define flush_cache_mm(mm) flush_cache_all_local()
17#endif
18
19#define flush_kernel_dcache_range(start,size) \
20 flush_kernel_dcache_range_asm((start), (start)+(size));
21
22extern void flush_cache_all_local(void);
23
24static inline void cacheflush_h_tmp_function(void *dummy)
25{
26 flush_cache_all_local();
27}
28
29static inline void flush_cache_all(void)
30{
31 on_each_cpu(cacheflush_h_tmp_function, NULL, 1, 1);
32}
33
34#define flush_cache_vmap(start, end) flush_cache_all()
35#define flush_cache_vunmap(start, end) flush_cache_all()
36
37extern int parisc_cache_flush_threshold;
38void parisc_setup_cache_timing(void);
39
40static inline void
41flush_user_dcache_range(unsigned long start, unsigned long end)
42{
43 if ((end - start) < parisc_cache_flush_threshold)
44 flush_user_dcache_range_asm(start,end);
45 else
46 flush_data_cache();
47}
48
49static inline void
50flush_user_icache_range(unsigned long start, unsigned long end)
51{
52 if ((end - start) < parisc_cache_flush_threshold)
53 flush_user_icache_range_asm(start,end);
54 else
55 flush_instruction_cache();
56}
57
58extern void flush_dcache_page(struct page *page);
59
60#define flush_dcache_mmap_lock(mapping) \
61 write_lock_irq(&(mapping)->tree_lock)
62#define flush_dcache_mmap_unlock(mapping) \
63 write_unlock_irq(&(mapping)->tree_lock)
64
65#define flush_icache_page(vma,page) do { flush_kernel_dcache_page(page_address(page)); flush_kernel_icache_page(page_address(page)); } while (0)
66
67#define flush_icache_range(s,e) do { flush_kernel_dcache_range_asm(s,e); flush_kernel_icache_range_asm(s,e); } while (0)
68
69#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
70do { \
71 flush_cache_page(vma, vaddr, page_to_pfn(page)); \
72 memcpy(dst, src, len); \
73 flush_kernel_dcache_range_asm((unsigned long)dst, (unsigned long)dst + len); \
74} while (0)
75
76#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
77do { \
78 flush_cache_page(vma, vaddr, page_to_pfn(page)); \
79 memcpy(dst, src, len); \
80} while (0)
81
82static inline void flush_cache_range(struct vm_area_struct *vma,
83 unsigned long start, unsigned long end)
84{
85 int sr3;
86
87 if (!vma->vm_mm->context) {
88 BUG();
89 return;
90 }
91
92 sr3 = mfsp(3);
93 if (vma->vm_mm->context == sr3) {
94 flush_user_dcache_range(start,end);
95 flush_user_icache_range(start,end);
96 } else {
97 flush_cache_all();
98 }
99}
100
101/* Simple function to work out if we have an existing address translation
102 * for a user space vma. */
103static inline int translation_exists(struct vm_area_struct *vma,
104 unsigned long addr, unsigned long pfn)
105{
106 pgd_t *pgd = pgd_offset(vma->vm_mm, addr);
107 pmd_t *pmd;
108 pte_t pte;
109
110 if(pgd_none(*pgd))
111 return 0;
112
113 pmd = pmd_offset(pgd, addr);
114 if(pmd_none(*pmd) || pmd_bad(*pmd))
115 return 0;
116
117 /* We cannot take the pte lock here: flush_cache_page is usually
118 * called with pte lock already held. Whereas flush_dcache_page
119 * takes flush_dcache_mmap_lock, which is lower in the hierarchy:
120 * the vma itself is secure, but the pte might come or go racily.
121 */
122 pte = *pte_offset_map(pmd, addr);
123 /* But pte_unmap() does nothing on this architecture */
124
125 /* Filter out coincidental file entries and swap entries */
126 if (!(pte_val(pte) & (_PAGE_FLUSH|_PAGE_PRESENT)))
127 return 0;
128
129 return pte_pfn(pte) == pfn;
130}
131
132/* Private function to flush a page from the cache of a non-current
133 * process. cr25 contains the Page Directory of the current user
134 * process; we're going to hijack both it and the user space %sr3 to
135 * temporarily make the non-current process current. We have to do
136 * this because cache flushing may cause a non-access tlb miss which
137 * the handlers have to fill in from the pgd of the non-current
138 * process. */
139static inline void
140flush_user_cache_page_non_current(struct vm_area_struct *vma,
141 unsigned long vmaddr)
142{
143 /* save the current process space and pgd */
144 unsigned long space = mfsp(3), pgd = mfctl(25);
145
146 /* we don't mind taking interrups since they may not
147 * do anything with user space, but we can't
148 * be preempted here */
149 preempt_disable();
150
151 /* make us current */
152 mtctl(__pa(vma->vm_mm->pgd), 25);
153 mtsp(vma->vm_mm->context, 3);
154
155 flush_user_dcache_page(vmaddr);
156 if(vma->vm_flags & VM_EXEC)
157 flush_user_icache_page(vmaddr);
158
159 /* put the old current process back */
160 mtsp(space, 3);
161 mtctl(pgd, 25);
162 preempt_enable();
163}
164
165static inline void
166__flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
167{
168 if (likely(vma->vm_mm->context == mfsp(3))) {
169 flush_user_dcache_page(vmaddr);
170 if (vma->vm_flags & VM_EXEC)
171 flush_user_icache_page(vmaddr);
172 } else {
173 flush_user_cache_page_non_current(vma, vmaddr);
174 }
175}
176
177static inline void
178flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
179{
180 BUG_ON(!vma->vm_mm->context);
181
182 if (likely(translation_exists(vma, vmaddr, pfn)))
183 __flush_cache_page(vma, vmaddr);
184
185}
186#endif