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1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/arch/m68k/mm/motorola.c |
1da177e4 LT |
3 | * |
4 | * Routines specific to the Motorola MMU, originally from: | |
5 | * linux/arch/m68k/init.c | |
6 | * which are Copyright (C) 1995 Hamish Macdonald | |
7 | * | |
8 | * Moved 8/20/1999 Sam Creasey | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/signal.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/swap.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/bootmem.h> | |
5a0e3ad6 | 21 | #include <linux/gfp.h> |
1da177e4 LT |
22 | |
23 | #include <asm/setup.h> | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/page.h> | |
26 | #include <asm/pgalloc.h> | |
1da177e4 LT |
27 | #include <asm/machdep.h> |
28 | #include <asm/io.h> | |
29 | #include <asm/dma.h> | |
30 | #ifdef CONFIG_ATARI | |
31 | #include <asm/atari_stram.h> | |
32 | #endif | |
c85627fb | 33 | #include <asm/sections.h> |
1da177e4 LT |
34 | |
35 | #undef DEBUG | |
36 | ||
37 | #ifndef mm_cachebits | |
38 | /* | |
39 | * Bits to add to page descriptors for "normal" caching mode. | |
40 | * For 68020/030 this is 0. | |
41 | * For 68040, this is _PAGE_CACHE040 (cachable, copyback) | |
42 | */ | |
43 | unsigned long mm_cachebits; | |
44 | EXPORT_SYMBOL(mm_cachebits); | |
45 | #endif | |
46 | ||
12d810c1 RZ |
47 | /* size of memory already mapped in head.S */ |
48 | #define INIT_MAPPED_SIZE (4UL<<20) | |
49 | ||
50 | extern unsigned long availmem; | |
51 | ||
1da177e4 LT |
52 | static pte_t * __init kernel_page_table(void) |
53 | { | |
54 | pte_t *ptablep; | |
55 | ||
56 | ptablep = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
57 | ||
58 | clear_page(ptablep); | |
59 | __flush_page_to_ram(ptablep); | |
60 | flush_tlb_kernel_page(ptablep); | |
61 | nocache_page(ptablep); | |
62 | ||
63 | return ptablep; | |
64 | } | |
65 | ||
66 | static pmd_t *last_pgtable __initdata = NULL; | |
67 | pmd_t *zero_pgtable __initdata = NULL; | |
68 | ||
69 | static pmd_t * __init kernel_ptr_table(void) | |
70 | { | |
71 | if (!last_pgtable) { | |
72 | unsigned long pmd, last; | |
73 | int i; | |
74 | ||
75 | /* Find the last ptr table that was used in head.S and | |
76 | * reuse the remaining space in that page for further | |
77 | * ptr tables. | |
78 | */ | |
79 | last = (unsigned long)kernel_pg_dir; | |
80 | for (i = 0; i < PTRS_PER_PGD; i++) { | |
81 | if (!pgd_present(kernel_pg_dir[i])) | |
82 | continue; | |
83 | pmd = __pgd_page(kernel_pg_dir[i]); | |
84 | if (pmd > last) | |
85 | last = pmd; | |
86 | } | |
87 | ||
88 | last_pgtable = (pmd_t *)last; | |
89 | #ifdef DEBUG | |
90 | printk("kernel_ptr_init: %p\n", last_pgtable); | |
91 | #endif | |
92 | } | |
93 | ||
94 | last_pgtable += PTRS_PER_PMD; | |
95 | if (((unsigned long)last_pgtable & ~PAGE_MASK) == 0) { | |
96 | last_pgtable = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
97 | ||
98 | clear_page(last_pgtable); | |
99 | __flush_page_to_ram(last_pgtable); | |
100 | flush_tlb_kernel_page(last_pgtable); | |
101 | nocache_page(last_pgtable); | |
102 | } | |
103 | ||
104 | return last_pgtable; | |
105 | } | |
106 | ||
12d810c1 | 107 | static void __init map_node(int node) |
1da177e4 LT |
108 | { |
109 | #define PTRTREESIZE (256*1024) | |
110 | #define ROOTTREESIZE (32*1024*1024) | |
12d810c1 | 111 | unsigned long physaddr, virtaddr, size; |
1da177e4 LT |
112 | pgd_t *pgd_dir; |
113 | pmd_t *pmd_dir; | |
114 | pte_t *pte_dir; | |
115 | ||
12d810c1 RZ |
116 | size = m68k_memory[node].size; |
117 | physaddr = m68k_memory[node].addr; | |
118 | virtaddr = (unsigned long)phys_to_virt(physaddr); | |
119 | physaddr |= m68k_supervisor_cachemode | | |
120 | _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY; | |
1da177e4 LT |
121 | if (CPU_IS_040_OR_060) |
122 | physaddr |= _PAGE_GLOBAL040; | |
123 | ||
124 | while (size > 0) { | |
125 | #ifdef DEBUG | |
126 | if (!(virtaddr & (PTRTREESIZE-1))) | |
127 | printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK, | |
128 | virtaddr); | |
129 | #endif | |
130 | pgd_dir = pgd_offset_k(virtaddr); | |
131 | if (virtaddr && CPU_IS_020_OR_030) { | |
132 | if (!(virtaddr & (ROOTTREESIZE-1)) && | |
133 | size >= ROOTTREESIZE) { | |
134 | #ifdef DEBUG | |
135 | printk ("[very early term]"); | |
136 | #endif | |
137 | pgd_val(*pgd_dir) = physaddr; | |
138 | size -= ROOTTREESIZE; | |
139 | virtaddr += ROOTTREESIZE; | |
140 | physaddr += ROOTTREESIZE; | |
141 | continue; | |
142 | } | |
143 | } | |
144 | if (!pgd_present(*pgd_dir)) { | |
145 | pmd_dir = kernel_ptr_table(); | |
146 | #ifdef DEBUG | |
147 | printk ("[new pointer %p]", pmd_dir); | |
148 | #endif | |
149 | pgd_set(pgd_dir, pmd_dir); | |
150 | } else | |
151 | pmd_dir = pmd_offset(pgd_dir, virtaddr); | |
152 | ||
153 | if (CPU_IS_020_OR_030) { | |
154 | if (virtaddr) { | |
155 | #ifdef DEBUG | |
156 | printk ("[early term]"); | |
157 | #endif | |
158 | pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr; | |
159 | physaddr += PTRTREESIZE; | |
160 | } else { | |
161 | int i; | |
162 | #ifdef DEBUG | |
163 | printk ("[zero map]"); | |
164 | #endif | |
165 | zero_pgtable = kernel_ptr_table(); | |
166 | pte_dir = (pte_t *)zero_pgtable; | |
167 | pmd_dir->pmd[0] = virt_to_phys(pte_dir) | | |
168 | _PAGE_TABLE | _PAGE_ACCESSED; | |
169 | pte_val(*pte_dir++) = 0; | |
170 | physaddr += PAGE_SIZE; | |
171 | for (i = 1; i < 64; physaddr += PAGE_SIZE, i++) | |
172 | pte_val(*pte_dir++) = physaddr; | |
173 | } | |
174 | size -= PTRTREESIZE; | |
175 | virtaddr += PTRTREESIZE; | |
176 | } else { | |
177 | if (!pmd_present(*pmd_dir)) { | |
178 | #ifdef DEBUG | |
179 | printk ("[new table]"); | |
180 | #endif | |
181 | pte_dir = kernel_page_table(); | |
182 | pmd_set(pmd_dir, pte_dir); | |
183 | } | |
184 | pte_dir = pte_offset_kernel(pmd_dir, virtaddr); | |
185 | ||
186 | if (virtaddr) { | |
187 | if (!pte_present(*pte_dir)) | |
188 | pte_val(*pte_dir) = physaddr; | |
189 | } else | |
190 | pte_val(*pte_dir) = 0; | |
191 | size -= PAGE_SIZE; | |
192 | virtaddr += PAGE_SIZE; | |
193 | physaddr += PAGE_SIZE; | |
194 | } | |
195 | ||
196 | } | |
197 | #ifdef DEBUG | |
198 | printk("\n"); | |
199 | #endif | |
1da177e4 LT |
200 | } |
201 | ||
202 | /* | |
203 | * paging_init() continues the virtual memory environment setup which | |
204 | * was begun by the code in arch/head.S. | |
205 | */ | |
206 | void __init paging_init(void) | |
207 | { | |
2dcf15b7 | 208 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; |
12d810c1 RZ |
209 | unsigned long min_addr, max_addr; |
210 | unsigned long addr, size, end; | |
211 | int i; | |
1da177e4 LT |
212 | |
213 | #ifdef DEBUG | |
fb425d0b | 214 | printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem); |
1da177e4 LT |
215 | #endif |
216 | ||
217 | /* Fix the cache mode in the page descriptors for the 680[46]0. */ | |
218 | if (CPU_IS_040_OR_060) { | |
219 | int i; | |
220 | #ifndef mm_cachebits | |
221 | mm_cachebits = _PAGE_CACHE040; | |
222 | #endif | |
223 | for (i = 0; i < 16; i++) | |
224 | pgprot_val(protection_map[i]) |= _PAGE_CACHE040; | |
225 | } | |
226 | ||
12d810c1 RZ |
227 | min_addr = m68k_memory[0].addr; |
228 | max_addr = min_addr + m68k_memory[0].size; | |
229 | for (i = 1; i < m68k_num_memory;) { | |
230 | if (m68k_memory[i].addr < min_addr) { | |
231 | printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n", | |
232 | m68k_memory[i].addr, m68k_memory[i].size); | |
233 | printk("Fix your bootloader or use a memfile to make use of this area!\n"); | |
234 | m68k_num_memory--; | |
235 | memmove(m68k_memory + i, m68k_memory + i + 1, | |
236 | (m68k_num_memory - i) * sizeof(struct mem_info)); | |
237 | continue; | |
238 | } | |
239 | addr = m68k_memory[i].addr + m68k_memory[i].size; | |
240 | if (addr > max_addr) | |
241 | max_addr = addr; | |
242 | i++; | |
243 | } | |
244 | m68k_memoffset = min_addr - PAGE_OFFSET; | |
245 | m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6; | |
246 | ||
fbe9c961 RZ |
247 | module_fixup(NULL, __start_fixup, __stop_fixup); |
248 | flush_icache(); | |
249 | ||
12d810c1 RZ |
250 | high_memory = phys_to_virt(max_addr); |
251 | ||
252 | min_low_pfn = availmem >> PAGE_SHIFT; | |
253 | max_low_pfn = max_addr >> PAGE_SHIFT; | |
254 | ||
255 | for (i = 0; i < m68k_num_memory; i++) { | |
256 | addr = m68k_memory[i].addr; | |
257 | end = addr + m68k_memory[i].size; | |
258 | m68k_setup_node(i); | |
259 | availmem = PAGE_ALIGN(availmem); | |
260 | availmem += init_bootmem_node(NODE_DATA(i), | |
261 | availmem >> PAGE_SHIFT, | |
262 | addr >> PAGE_SHIFT, | |
263 | end >> PAGE_SHIFT); | |
264 | } | |
265 | ||
1da177e4 LT |
266 | /* |
267 | * Map the physical memory available into the kernel virtual | |
12d810c1 RZ |
268 | * address space. First initialize the bootmem allocator with |
269 | * the memory we already mapped, so map_node() has something | |
270 | * to allocate. | |
1da177e4 | 271 | */ |
12d810c1 RZ |
272 | addr = m68k_memory[0].addr; |
273 | size = m68k_memory[0].size; | |
274 | free_bootmem_node(NODE_DATA(0), availmem, min(INIT_MAPPED_SIZE, size) - (availmem - addr)); | |
275 | map_node(0); | |
276 | if (size > INIT_MAPPED_SIZE) | |
277 | free_bootmem_node(NODE_DATA(0), addr + INIT_MAPPED_SIZE, size - INIT_MAPPED_SIZE); | |
1da177e4 | 278 | |
12d810c1 RZ |
279 | for (i = 1; i < m68k_num_memory; i++) |
280 | map_node(i); | |
1da177e4 LT |
281 | |
282 | flush_tlb_all(); | |
1da177e4 LT |
283 | |
284 | /* | |
285 | * initialize the bad page table and bad page to point | |
286 | * to a couple of allocated pages | |
287 | */ | |
288 | empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); | |
1da177e4 LT |
289 | |
290 | /* | |
291 | * Set up SFC/DFC registers | |
292 | */ | |
293 | set_fs(KERNEL_DS); | |
294 | ||
295 | #ifdef DEBUG | |
296 | printk ("before free_area_init\n"); | |
297 | #endif | |
12d810c1 RZ |
298 | for (i = 0; i < m68k_num_memory; i++) { |
299 | zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT; | |
9109fb7b | 300 | free_area_init_node(i, zones_size, |
12d810c1 | 301 | m68k_memory[i].addr >> PAGE_SHIFT, NULL); |
4aac0b48 MS |
302 | if (node_present_pages(i)) |
303 | node_set_state(i, N_NORMAL_MEMORY); | |
12d810c1 | 304 | } |
1da177e4 LT |
305 | } |
306 |