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7#include <linux/module.h>
8#include <linux/mm.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11#include <linux/types.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/pagemap.h>
15
16#include <asm/setup.h>
17#include <asm/segment.h>
18#include <asm/page.h>
19#include <asm/pgalloc.h>
20#include <asm/system.h>
21#include <asm/traps.h>
22#include <asm/machdep.h>
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28
29typedef struct list_head ptable_desc;
30static LIST_HEAD(ptable_list);
31
32#define PD_PTABLE(page) ((ptable_desc *)&(virt_to_page(page)->lru))
33#define PD_PAGE(ptable) (list_entry(ptable, struct page, lru))
34#define PD_MARKBITS(dp) (*(unsigned char *)&PD_PAGE(dp)->index)
35
36#define PTABLE_SIZE (PTRS_PER_PMD * sizeof(pmd_t))
37
38void __init init_pointer_table(unsigned long ptable)
39{
40 ptable_desc *dp;
41 unsigned long page = ptable & PAGE_MASK;
42 unsigned char mask = 1 << ((ptable - page)/PTABLE_SIZE);
43
44 dp = PD_PTABLE(page);
45 if (!(PD_MARKBITS(dp) & mask)) {
46 PD_MARKBITS(dp) = 0xff;
47 list_add(dp, &ptable_list);
48 }
49
50 PD_MARKBITS(dp) &= ~mask;
51#ifdef DEBUG
52 printk("init_pointer_table: %lx, %x\n", ptable, PD_MARKBITS(dp));
53#endif
54
55
56 PD_PAGE(dp)->flags &= ~(1 << PG_reserved);
57 init_page_count(PD_PAGE(dp));
58
59 return;
60}
61
62pmd_t *get_pointer_table (void)
63{
64 ptable_desc *dp = ptable_list.next;
65 unsigned char mask = PD_MARKBITS (dp);
66 unsigned char tmp;
67 unsigned int off;
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75 if (mask == 0) {
76 void *page;
77 ptable_desc *new;
78
79 if (!(page = (void *)get_zeroed_page(GFP_KERNEL)))
80 return NULL;
81
82 flush_tlb_kernel_page(page);
83 nocache_page(page);
84
85 new = PD_PTABLE(page);
86 PD_MARKBITS(new) = 0xfe;
87 list_add_tail(new, dp);
88
89 return (pmd_t *)page;
90 }
91
92 for (tmp = 1, off = 0; (mask & tmp) == 0; tmp <<= 1, off += PTABLE_SIZE)
93 ;
94 PD_MARKBITS(dp) = mask & ~tmp;
95 if (!PD_MARKBITS(dp)) {
96
97 list_move_tail(dp, &ptable_list);
98 }
99 return (pmd_t *) (page_address(PD_PAGE(dp)) + off);
100}
101
102int free_pointer_table (pmd_t *ptable)
103{
104 ptable_desc *dp;
105 unsigned long page = (unsigned long)ptable & PAGE_MASK;
106 unsigned char mask = 1 << (((unsigned long)ptable - page)/PTABLE_SIZE);
107
108 dp = PD_PTABLE(page);
109 if (PD_MARKBITS (dp) & mask)
110 panic ("table already free!");
111
112 PD_MARKBITS (dp) |= mask;
113
114 if (PD_MARKBITS(dp) == 0xff) {
115
116 list_del(dp);
117 cache_page((void *)page);
118 free_page (page);
119 return 1;
120 } else if (ptable_list.next != dp) {
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125 list_move(dp, &ptable_list);
126 }
127 return 0;
128}
129
130
131static inline void clear040(unsigned long paddr)
132{
133 asm volatile (
134 "nop\n\t"
135 ".chip 68040\n\t"
136 "cinvp %%bc,(%0)\n\t"
137 ".chip 68k"
138 : : "a" (paddr));
139}
140
141
142static inline void cleari040(unsigned long paddr)
143{
144 asm volatile (
145 "nop\n\t"
146 ".chip 68040\n\t"
147 "cinvp %%ic,(%0)\n\t"
148 ".chip 68k"
149 : : "a" (paddr));
150}
151
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154static inline void push040(unsigned long paddr)
155{
156 asm volatile (
157 "nop\n\t"
158 ".chip 68040\n\t"
159 "cpushp %%bc,(%0)\n\t"
160 ".chip 68k"
161 : : "a" (paddr));
162}
163
164
165
166static inline void pushcl040(unsigned long paddr)
167{
168 unsigned long flags;
169
170 local_irq_save(flags);
171 push040(paddr);
172 if (CPU_IS_060)
173 clear040(paddr);
174 local_irq_restore(flags);
175}
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204void cache_clear (unsigned long paddr, int len)
205{
206 if (CPU_IS_040_OR_060) {
207 int tmp;
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214 if ((tmp = -paddr & (PAGE_SIZE - 1))) {
215 pushcl040(paddr & PAGE_MASK);
216 if ((len -= tmp) <= 0)
217 return;
218 paddr += tmp;
219 }
220 tmp = PAGE_SIZE;
221 paddr &= PAGE_MASK;
222 while ((len -= tmp) >= 0) {
223 clear040(paddr);
224 paddr += tmp;
225 }
226 if ((len += tmp))
227
228 pushcl040(paddr);
229 }
230 else
231 asm volatile ("movec %/cacr,%/d0\n\t"
232 "oriw %0,%/d0\n\t"
233 "movec %/d0,%/cacr"
234 : : "i" (FLUSH_I_AND_D)
235 : "d0");
236#ifdef CONFIG_M68K_L2_CACHE
237 if(mach_l2_flush)
238 mach_l2_flush(0);
239#endif
240}
241EXPORT_SYMBOL(cache_clear);
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251void cache_push (unsigned long paddr, int len)
252{
253 if (CPU_IS_040_OR_060) {
254 int tmp = PAGE_SIZE;
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261 len += paddr & (PAGE_SIZE - 1);
262
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267 paddr &= PAGE_MASK;
268
269 do {
270 push040(paddr);
271 paddr += tmp;
272 } while ((len -= tmp) > 0);
273 }
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283 else
284 asm volatile ("movec %/cacr,%/d0\n\t"
285 "oriw %0,%/d0\n\t"
286 "movec %/d0,%/cacr"
287 : : "i" (FLUSH_I)
288 : "d0");
289#ifdef CONFIG_M68K_L2_CACHE
290 if(mach_l2_flush)
291 mach_l2_flush(1);
292#endif
293}
294EXPORT_SYMBOL(cache_push);
295
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