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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/m68k/mm/motorola.c
4 *
5 * Routines specific to the Motorola MMU, originally from:
6 * linux/arch/m68k/init.c
7 * which are Copyright (C) 1995 Hamish Macdonald
8 *
9 * Moved 8/20/1999 Sam Creasey
10 */
11
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 * Bits to add to page descriptors for "normal" caching mode.
41 * For 68020/030 this is 0.
42 * For 68040, this is _PAGE_CACHE040 (cachable, copyback)
43 */
44unsigned long mm_cachebits;
45EXPORT_SYMBOL(mm_cachebits);
46#endif
47
48/* Prior to calling these routines, the page should have been flushed
49 * from both the cache and ATC, or the CPU might not notice that the
50 * cache setting for the page has been changed. -jskov
51 */
52static inline void nocache_page(void *vaddr)
53{
54 unsigned long addr = (unsigned long)vaddr;
55
56 if (CPU_IS_040_OR_060) {
57 pte_t *ptep = virt_to_kpte(addr);
58
59 *ptep = pte_mknocache(*ptep);
60 }
61}
62
63static inline void cache_page(void *vaddr)
64{
65 unsigned long addr = (unsigned long)vaddr;
66
67 if (CPU_IS_040_OR_060) {
68 pte_t *ptep = virt_to_kpte(addr);
69
70 *ptep = pte_mkcache(*ptep);
71 }
72}
73
74/*
75 * Motorola 680x0 user's manual recommends using uncached memory for address
76 * translation tables.
77 *
78 * Seeing how the MMU can be external on (some of) these chips, that seems like
79 * a very important recommendation to follow. Provide some helpers to combat
80 * 'variation' amongst the users of this.
81 */
82
83void mmu_page_ctor(void *page)
84{
85 __flush_page_to_ram(page);
86 flush_tlb_kernel_page(page);
87 nocache_page(page);
88}
89
90void mmu_page_dtor(void *page)
91{
92 cache_page(page);
93}
94
95/* ++andreas: {get,free}_pointer_table rewritten to use unused fields from
96 struct page instead of separately kmalloced struct. Stolen from
97 arch/sparc/mm/srmmu.c ... */
98
99typedef struct list_head ptable_desc;
100
101static struct list_head ptable_list[2] = {
102 LIST_HEAD_INIT(ptable_list[0]),
103 LIST_HEAD_INIT(ptable_list[1]),
104};
105
106#define PD_PTABLE(page) ((ptable_desc *)&(virt_to_page(page)->lru))
107#define PD_PAGE(ptable) (list_entry(ptable, struct page, lru))
108#define PD_MARKBITS(dp) (*(unsigned int *)&PD_PAGE(dp)->index)
109
110static const int ptable_shift[2] = {
111 7+2, /* PGD, PMD */
112 6+2, /* PTE */
113};
114
115#define ptable_size(type) (1U << ptable_shift[type])
116#define ptable_mask(type) ((1U << (PAGE_SIZE / ptable_size(type))) - 1)
117
118void __init init_pointer_table(void *table, int type)
119{
120 ptable_desc *dp;
121 unsigned long ptable = (unsigned long)table;
122 unsigned long page = ptable & PAGE_MASK;
123 unsigned int mask = 1U << ((ptable - page)/ptable_size(type));
124
125 dp = PD_PTABLE(page);
126 if (!(PD_MARKBITS(dp) & mask)) {
127 PD_MARKBITS(dp) = ptable_mask(type);
128 list_add(dp, &ptable_list[type]);
129 }
130
131 PD_MARKBITS(dp) &= ~mask;
132 pr_debug("init_pointer_table: %lx, %x\n", ptable, PD_MARKBITS(dp));
133
134 /* unreserve the page so it's possible to free that page */
135 __ClearPageReserved(PD_PAGE(dp));
136 init_page_count(PD_PAGE(dp));
137
138 return;
139}
140
141void *get_pointer_table(int type)
142{
143 ptable_desc *dp = ptable_list[type].next;
144 unsigned int mask = list_empty(&ptable_list[type]) ? 0 : PD_MARKBITS(dp);
145 unsigned int tmp, off;
146
147 /*
148 * For a pointer table for a user process address space, a
149 * table is taken from a page allocated for the purpose. Each
150 * page can hold 8 pointer tables. The page is remapped in
151 * virtual address space to be noncacheable.
152 */
153 if (mask == 0) {
154 void *page;
155 ptable_desc *new;
156
157 if (!(page = (void *)get_zeroed_page(GFP_KERNEL)))
158 return NULL;
159
160 if (type == TABLE_PTE) {
161 /*
162 * m68k doesn't have SPLIT_PTE_PTLOCKS for not having
163 * SMP.
164 */
165 pgtable_pte_page_ctor(virt_to_page(page));
166 }
167
168 mmu_page_ctor(page);
169
170 new = PD_PTABLE(page);
171 PD_MARKBITS(new) = ptable_mask(type) - 1;
172 list_add_tail(new, dp);
173
174 return (pmd_t *)page;
175 }
176
177 for (tmp = 1, off = 0; (mask & tmp) == 0; tmp <<= 1, off += ptable_size(type))
178 ;
179 PD_MARKBITS(dp) = mask & ~tmp;
180 if (!PD_MARKBITS(dp)) {
181 /* move to end of list */
182 list_move_tail(dp, &ptable_list[type]);
183 }
184 return page_address(PD_PAGE(dp)) + off;
185}
186
187int free_pointer_table(void *table, int type)
188{
189 ptable_desc *dp;
190 unsigned long ptable = (unsigned long)table;
191 unsigned long page = ptable & PAGE_MASK;
192 unsigned int mask = 1U << ((ptable - page)/ptable_size(type));
193
194 dp = PD_PTABLE(page);
195 if (PD_MARKBITS (dp) & mask)
196 panic ("table already free!");
197
198 PD_MARKBITS (dp) |= mask;
199
200 if (PD_MARKBITS(dp) == ptable_mask(type)) {
201 /* all tables in page are free, free page */
202 list_del(dp);
203 mmu_page_dtor((void *)page);
204 if (type == TABLE_PTE)
205 pgtable_pte_page_dtor(virt_to_page(page));
206 free_page (page);
207 return 1;
208 } else if (ptable_list[type].next != dp) {
209 /*
210 * move this descriptor to the front of the list, since
211 * it has one or more free tables.
212 */
213 list_move(dp, &ptable_list[type]);
214 }
215 return 0;
216}
217
218/* size of memory already mapped in head.S */
219extern __initdata unsigned long m68k_init_mapped_size;
220
221extern unsigned long availmem;
222
223static pte_t *last_pte_table __initdata = NULL;
224
225static pte_t * __init kernel_page_table(void)
226{
227 pte_t *pte_table = last_pte_table;
228
229 if (((unsigned long)last_pte_table & ~PAGE_MASK) == 0) {
230 pte_table = (pte_t *)memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
231 if (!pte_table) {
232 panic("%s: Failed to allocate %lu bytes align=%lx\n",
233 __func__, PAGE_SIZE, PAGE_SIZE);
234 }
235
236 clear_page(pte_table);
237 mmu_page_ctor(pte_table);
238
239 last_pte_table = pte_table;
240 }
241
242 last_pte_table += PTRS_PER_PTE;
243
244 return pte_table;
245}
246
247static pmd_t *last_pmd_table __initdata = NULL;
248
249static pmd_t * __init kernel_ptr_table(void)
250{
251 if (!last_pmd_table) {
252 unsigned long pmd, last;
253 int i;
254
255 /* Find the last ptr table that was used in head.S and
256 * reuse the remaining space in that page for further
257 * ptr tables.
258 */
259 last = (unsigned long)kernel_pg_dir;
260 for (i = 0; i < PTRS_PER_PGD; i++) {
261 pud_t *pud = (pud_t *)(&kernel_pg_dir[i]);
262
263 if (!pud_present(*pud))
264 continue;
265 pmd = pgd_page_vaddr(kernel_pg_dir[i]);
266 if (pmd > last)
267 last = pmd;
268 }
269
270 last_pmd_table = (pmd_t *)last;
271#ifdef DEBUG
272 printk("kernel_ptr_init: %p\n", last_pmd_table);
273#endif
274 }
275
276 last_pmd_table += PTRS_PER_PMD;
277 if (((unsigned long)last_pmd_table & ~PAGE_MASK) == 0) {
278 last_pmd_table = (pmd_t *)memblock_alloc_low(PAGE_SIZE,
279 PAGE_SIZE);
280 if (!last_pmd_table)
281 panic("%s: Failed to allocate %lu bytes align=%lx\n",
282 __func__, PAGE_SIZE, PAGE_SIZE);
283
284 clear_page(last_pmd_table);
285 mmu_page_ctor(last_pmd_table);
286 }
287
288 return last_pmd_table;
289}
290
291static void __init map_node(int node)
292{
293 unsigned long physaddr, virtaddr, size;
294 pgd_t *pgd_dir;
295 p4d_t *p4d_dir;
296 pud_t *pud_dir;
297 pmd_t *pmd_dir;
298 pte_t *pte_dir;
299
300 size = m68k_memory[node].size;
301 physaddr = m68k_memory[node].addr;
302 virtaddr = (unsigned long)phys_to_virt(physaddr);
303 physaddr |= m68k_supervisor_cachemode |
304 _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY;
305 if (CPU_IS_040_OR_060)
306 physaddr |= _PAGE_GLOBAL040;
307
308 while (size > 0) {
309#ifdef DEBUG
310 if (!(virtaddr & (PMD_SIZE-1)))
311 printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
312 virtaddr);
313#endif
314 pgd_dir = pgd_offset_k(virtaddr);
315 if (virtaddr && CPU_IS_020_OR_030) {
316 if (!(virtaddr & (PGDIR_SIZE-1)) &&
317 size >= PGDIR_SIZE) {
318#ifdef DEBUG
319 printk ("[very early term]");
320#endif
321 pgd_val(*pgd_dir) = physaddr;
322 size -= PGDIR_SIZE;
323 virtaddr += PGDIR_SIZE;
324 physaddr += PGDIR_SIZE;
325 continue;
326 }
327 }
328 p4d_dir = p4d_offset(pgd_dir, virtaddr);
329 pud_dir = pud_offset(p4d_dir, virtaddr);
330 if (!pud_present(*pud_dir)) {
331 pmd_dir = kernel_ptr_table();
332#ifdef DEBUG
333 printk ("[new pointer %p]", pmd_dir);
334#endif
335 pud_set(pud_dir, pmd_dir);
336 } else
337 pmd_dir = pmd_offset(pud_dir, virtaddr);
338
339 if (CPU_IS_020_OR_030) {
340 if (virtaddr) {
341#ifdef DEBUG
342 printk ("[early term]");
343#endif
344 pmd_val(*pmd_dir) = physaddr;
345 physaddr += PMD_SIZE;
346 } else {
347 int i;
348#ifdef DEBUG
349 printk ("[zero map]");
350#endif
351 pte_dir = kernel_page_table();
352 pmd_set(pmd_dir, pte_dir);
353
354 pte_val(*pte_dir++) = 0;
355 physaddr += PAGE_SIZE;
356 for (i = 1; i < PTRS_PER_PTE; physaddr += PAGE_SIZE, i++)
357 pte_val(*pte_dir++) = physaddr;
358 }
359 size -= PMD_SIZE;
360 virtaddr += PMD_SIZE;
361 } else {
362 if (!pmd_present(*pmd_dir)) {
363#ifdef DEBUG
364 printk ("[new table]");
365#endif
366 pte_dir = kernel_page_table();
367 pmd_set(pmd_dir, pte_dir);
368 }
369 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
370
371 if (virtaddr) {
372 if (!pte_present(*pte_dir))
373 pte_val(*pte_dir) = physaddr;
374 } else
375 pte_val(*pte_dir) = 0;
376 size -= PAGE_SIZE;
377 virtaddr += PAGE_SIZE;
378 physaddr += PAGE_SIZE;
379 }
380
381 }
382#ifdef DEBUG
383 printk("\n");
384#endif
385}
386
387/*
388 * paging_init() continues the virtual memory environment setup which
389 * was begun by the code in arch/head.S.
390 */
391void __init paging_init(void)
392{
393 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
394 unsigned long min_addr, max_addr;
395 unsigned long addr;
396 int i;
397
398#ifdef DEBUG
399 printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem);
400#endif
401
402 /* Fix the cache mode in the page descriptors for the 680[46]0. */
403 if (CPU_IS_040_OR_060) {
404 int i;
405#ifndef mm_cachebits
406 mm_cachebits = _PAGE_CACHE040;
407#endif
408 for (i = 0; i < 16; i++)
409 pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
410 }
411
412 min_addr = m68k_memory[0].addr;
413 max_addr = min_addr + m68k_memory[0].size;
414 memblock_add_node(m68k_memory[0].addr, m68k_memory[0].size, 0);
415 for (i = 1; i < m68k_num_memory;) {
416 if (m68k_memory[i].addr < min_addr) {
417 printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n",
418 m68k_memory[i].addr, m68k_memory[i].size);
419 printk("Fix your bootloader or use a memfile to make use of this area!\n");
420 m68k_num_memory--;
421 memmove(m68k_memory + i, m68k_memory + i + 1,
422 (m68k_num_memory - i) * sizeof(struct m68k_mem_info));
423 continue;
424 }
425 memblock_add_node(m68k_memory[i].addr, m68k_memory[i].size, i);
426 addr = m68k_memory[i].addr + m68k_memory[i].size;
427 if (addr > max_addr)
428 max_addr = addr;
429 i++;
430 }
431 m68k_memoffset = min_addr - PAGE_OFFSET;
432 m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;
433
434 module_fixup(NULL, __start_fixup, __stop_fixup);
435 flush_icache();
436
437 high_memory = phys_to_virt(max_addr);
438
439 min_low_pfn = availmem >> PAGE_SHIFT;
440 max_pfn = max_low_pfn = max_addr >> PAGE_SHIFT;
441
442 /* Reserve kernel text/data/bss and the memory allocated in head.S */
443 memblock_reserve(m68k_memory[0].addr, availmem - m68k_memory[0].addr);
444
445 /*
446 * Map the physical memory available into the kernel virtual
447 * address space. Make sure memblock will not try to allocate
448 * pages beyond the memory we already mapped in head.S
449 */
450 memblock_set_bottom_up(true);
451
452 for (i = 0; i < m68k_num_memory; i++) {
453 m68k_setup_node(i);
454 map_node(i);
455 }
456
457 flush_tlb_all();
458
459 /*
460 * initialize the bad page table and bad page to point
461 * to a couple of allocated pages
462 */
463 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
464 if (!empty_zero_page)
465 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
466 __func__, PAGE_SIZE, PAGE_SIZE);
467
468 /*
469 * Set up SFC/DFC registers
470 */
471 set_fs(KERNEL_DS);
472
473#ifdef DEBUG
474 printk ("before free_area_init\n");
475#endif
476 for (i = 0; i < m68k_num_memory; i++)
477 if (node_present_pages(i))
478 node_set_state(i, N_NORMAL_MEMORY);
479
480 max_zone_pfn[ZONE_DMA] = memblock_end_of_DRAM();
481 free_area_init(max_zone_pfn);
482}
1/*
2 * linux/arch/m68k/mm/motorola.c
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
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>
21#include <linux/gfp.h>
22
23#include <asm/setup.h>
24#include <asm/uaccess.h>
25#include <asm/page.h>
26#include <asm/pgalloc.h>
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
33#include <asm/sections.h>
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 */
43unsigned long mm_cachebits;
44EXPORT_SYMBOL(mm_cachebits);
45#endif
46
47/* size of memory already mapped in head.S */
48extern __initdata unsigned long m68k_init_mapped_size;
49
50extern unsigned long availmem;
51
52static 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
66static pmd_t *last_pgtable __initdata = NULL;
67pmd_t *zero_pgtable __initdata = NULL;
68
69static 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
107static void __init map_node(int node)
108{
109#define PTRTREESIZE (256*1024)
110#define ROOTTREESIZE (32*1024*1024)
111 unsigned long physaddr, virtaddr, size;
112 pgd_t *pgd_dir;
113 pmd_t *pmd_dir;
114 pte_t *pte_dir;
115
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;
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
200}
201
202/*
203 * paging_init() continues the virtual memory environment setup which
204 * was begun by the code in arch/head.S.
205 */
206void __init paging_init(void)
207{
208 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
209 unsigned long min_addr, max_addr;
210 unsigned long addr, size, end;
211 int i;
212
213#ifdef DEBUG
214 printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem);
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
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 m68k_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
247 module_fixup(NULL, __start_fixup, __stop_fixup);
248 flush_icache();
249
250 high_memory = phys_to_virt(max_addr);
251
252 min_low_pfn = availmem >> PAGE_SHIFT;
253 max_pfn = 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
266 /*
267 * Map the physical memory available into the kernel virtual
268 * address space. First initialize the bootmem allocator with
269 * the memory we already mapped, so map_node() has something
270 * to allocate.
271 */
272 addr = m68k_memory[0].addr;
273 size = m68k_memory[0].size;
274 free_bootmem_node(NODE_DATA(0), availmem,
275 min(m68k_init_mapped_size, size) - (availmem - addr));
276 map_node(0);
277 if (size > m68k_init_mapped_size)
278 free_bootmem_node(NODE_DATA(0), addr + m68k_init_mapped_size,
279 size - m68k_init_mapped_size);
280
281 for (i = 1; i < m68k_num_memory; i++)
282 map_node(i);
283
284 flush_tlb_all();
285
286 /*
287 * initialize the bad page table and bad page to point
288 * to a couple of allocated pages
289 */
290 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
291
292 /*
293 * Set up SFC/DFC registers
294 */
295 set_fs(KERNEL_DS);
296
297#ifdef DEBUG
298 printk ("before free_area_init\n");
299#endif
300 for (i = 0; i < m68k_num_memory; i++) {
301 zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT;
302 free_area_init_node(i, zones_size,
303 m68k_memory[i].addr >> PAGE_SHIFT, NULL);
304 if (node_present_pages(i))
305 node_set_state(i, N_NORMAL_MEMORY);
306 }
307}
308