This source file includes following definitions.
- kernel_page_table
- kernel_ptr_table
- map_node
- paging_init
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12 #include <linux/module.h>
13 #include <linux/signal.h>
14 #include <linux/sched.h>
15 #include <linux/mm.h>
16 #include <linux/swap.h>
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/types.h>
20 #include <linux/init.h>
21 #include <linux/memblock.h>
22 #include <linux/gfp.h>
23
24 #include <asm/setup.h>
25 #include <linux/uaccess.h>
26 #include <asm/page.h>
27 #include <asm/pgalloc.h>
28 #include <asm/machdep.h>
29 #include <asm/io.h>
30 #include <asm/dma.h>
31 #ifdef CONFIG_ATARI
32 #include <asm/atari_stram.h>
33 #endif
34 #include <asm/sections.h>
35
36 #undef DEBUG
37
38 #ifndef mm_cachebits
39
40
41
42
43
44 unsigned long mm_cachebits;
45 EXPORT_SYMBOL(mm_cachebits);
46 #endif
47
48
49 extern __initdata unsigned long m68k_init_mapped_size;
50
51 extern unsigned long availmem;
52
53 static pte_t * __init kernel_page_table(void)
54 {
55 pte_t *ptablep;
56
57 ptablep = (pte_t *)memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
58 if (!ptablep)
59 panic("%s: Failed to allocate %lu bytes align=%lx\n",
60 __func__, PAGE_SIZE, PAGE_SIZE);
61
62 clear_page(ptablep);
63 __flush_page_to_ram(ptablep);
64 flush_tlb_kernel_page(ptablep);
65 nocache_page(ptablep);
66
67 return ptablep;
68 }
69
70 static pmd_t *last_pgtable __initdata = NULL;
71 pmd_t *zero_pgtable __initdata = NULL;
72
73 static pmd_t * __init kernel_ptr_table(void)
74 {
75 if (!last_pgtable) {
76 unsigned long pmd, last;
77 int i;
78
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82
83 last = (unsigned long)kernel_pg_dir;
84 for (i = 0; i < PTRS_PER_PGD; i++) {
85 if (!pgd_present(kernel_pg_dir[i]))
86 continue;
87 pmd = __pgd_page(kernel_pg_dir[i]);
88 if (pmd > last)
89 last = pmd;
90 }
91
92 last_pgtable = (pmd_t *)last;
93 #ifdef DEBUG
94 printk("kernel_ptr_init: %p\n", last_pgtable);
95 #endif
96 }
97
98 last_pgtable += PTRS_PER_PMD;
99 if (((unsigned long)last_pgtable & ~PAGE_MASK) == 0) {
100 last_pgtable = (pmd_t *)memblock_alloc_low(PAGE_SIZE,
101 PAGE_SIZE);
102 if (!last_pgtable)
103 panic("%s: Failed to allocate %lu bytes align=%lx\n",
104 __func__, PAGE_SIZE, PAGE_SIZE);
105
106 clear_page(last_pgtable);
107 __flush_page_to_ram(last_pgtable);
108 flush_tlb_kernel_page(last_pgtable);
109 nocache_page(last_pgtable);
110 }
111
112 return last_pgtable;
113 }
114
115 static void __init map_node(int node)
116 {
117 #define PTRTREESIZE (256*1024)
118 #define ROOTTREESIZE (32*1024*1024)
119 unsigned long physaddr, virtaddr, size;
120 pgd_t *pgd_dir;
121 pmd_t *pmd_dir;
122 pte_t *pte_dir;
123
124 size = m68k_memory[node].size;
125 physaddr = m68k_memory[node].addr;
126 virtaddr = (unsigned long)phys_to_virt(physaddr);
127 physaddr |= m68k_supervisor_cachemode |
128 _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY;
129 if (CPU_IS_040_OR_060)
130 physaddr |= _PAGE_GLOBAL040;
131
132 while (size > 0) {
133 #ifdef DEBUG
134 if (!(virtaddr & (PTRTREESIZE-1)))
135 printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
136 virtaddr);
137 #endif
138 pgd_dir = pgd_offset_k(virtaddr);
139 if (virtaddr && CPU_IS_020_OR_030) {
140 if (!(virtaddr & (ROOTTREESIZE-1)) &&
141 size >= ROOTTREESIZE) {
142 #ifdef DEBUG
143 printk ("[very early term]");
144 #endif
145 pgd_val(*pgd_dir) = physaddr;
146 size -= ROOTTREESIZE;
147 virtaddr += ROOTTREESIZE;
148 physaddr += ROOTTREESIZE;
149 continue;
150 }
151 }
152 if (!pgd_present(*pgd_dir)) {
153 pmd_dir = kernel_ptr_table();
154 #ifdef DEBUG
155 printk ("[new pointer %p]", pmd_dir);
156 #endif
157 pgd_set(pgd_dir, pmd_dir);
158 } else
159 pmd_dir = pmd_offset(pgd_dir, virtaddr);
160
161 if (CPU_IS_020_OR_030) {
162 if (virtaddr) {
163 #ifdef DEBUG
164 printk ("[early term]");
165 #endif
166 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
167 physaddr += PTRTREESIZE;
168 } else {
169 int i;
170 #ifdef DEBUG
171 printk ("[zero map]");
172 #endif
173 zero_pgtable = kernel_ptr_table();
174 pte_dir = (pte_t *)zero_pgtable;
175 pmd_dir->pmd[0] = virt_to_phys(pte_dir) |
176 _PAGE_TABLE | _PAGE_ACCESSED;
177 pte_val(*pte_dir++) = 0;
178 physaddr += PAGE_SIZE;
179 for (i = 1; i < 64; physaddr += PAGE_SIZE, i++)
180 pte_val(*pte_dir++) = physaddr;
181 }
182 size -= PTRTREESIZE;
183 virtaddr += PTRTREESIZE;
184 } else {
185 if (!pmd_present(*pmd_dir)) {
186 #ifdef DEBUG
187 printk ("[new table]");
188 #endif
189 pte_dir = kernel_page_table();
190 pmd_set(pmd_dir, pte_dir);
191 }
192 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
193
194 if (virtaddr) {
195 if (!pte_present(*pte_dir))
196 pte_val(*pte_dir) = physaddr;
197 } else
198 pte_val(*pte_dir) = 0;
199 size -= PAGE_SIZE;
200 virtaddr += PAGE_SIZE;
201 physaddr += PAGE_SIZE;
202 }
203
204 }
205 #ifdef DEBUG
206 printk("\n");
207 #endif
208 }
209
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212
213
214 void __init paging_init(void)
215 {
216 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
217 unsigned long min_addr, max_addr;
218 unsigned long addr;
219 int i;
220
221 #ifdef DEBUG
222 printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem);
223 #endif
224
225
226 if (CPU_IS_040_OR_060) {
227 int i;
228 #ifndef mm_cachebits
229 mm_cachebits = _PAGE_CACHE040;
230 #endif
231 for (i = 0; i < 16; i++)
232 pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
233 }
234
235 min_addr = m68k_memory[0].addr;
236 max_addr = min_addr + m68k_memory[0].size;
237 memblock_add(m68k_memory[0].addr, m68k_memory[0].size);
238 for (i = 1; i < m68k_num_memory;) {
239 if (m68k_memory[i].addr < min_addr) {
240 printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n",
241 m68k_memory[i].addr, m68k_memory[i].size);
242 printk("Fix your bootloader or use a memfile to make use of this area!\n");
243 m68k_num_memory--;
244 memmove(m68k_memory + i, m68k_memory + i + 1,
245 (m68k_num_memory - i) * sizeof(struct m68k_mem_info));
246 continue;
247 }
248 memblock_add(m68k_memory[i].addr, m68k_memory[i].size);
249 addr = m68k_memory[i].addr + m68k_memory[i].size;
250 if (addr > max_addr)
251 max_addr = addr;
252 i++;
253 }
254 m68k_memoffset = min_addr - PAGE_OFFSET;
255 m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;
256
257 module_fixup(NULL, __start_fixup, __stop_fixup);
258 flush_icache();
259
260 high_memory = phys_to_virt(max_addr);
261
262 min_low_pfn = availmem >> PAGE_SHIFT;
263 max_pfn = max_low_pfn = max_addr >> PAGE_SHIFT;
264
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266 memblock_reserve(m68k_memory[0].addr, availmem - m68k_memory[0].addr);
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273 memblock_set_bottom_up(true);
274
275 for (i = 0; i < m68k_num_memory; i++) {
276 m68k_setup_node(i);
277 map_node(i);
278 }
279
280 flush_tlb_all();
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286 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
287 if (!empty_zero_page)
288 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
289 __func__, PAGE_SIZE, PAGE_SIZE);
290
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294 set_fs(KERNEL_DS);
295
296 #ifdef DEBUG
297 printk ("before free_area_init\n");
298 #endif
299 for (i = 0; i < m68k_num_memory; i++) {
300 zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT;
301 free_area_init_node(i, zones_size,
302 m68k_memory[i].addr >> PAGE_SHIFT, NULL);
303 if (node_present_pages(i))
304 node_set_state(i, N_NORMAL_MEMORY);
305 }
306 }
307