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1/*
2 * linux/arch/sparc/mm/init.c
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
8 */
9
10#include <linux/module.h>
11#include <linux/signal.h>
12#include <linux/sched.h>
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/string.h>
16#include <linux/types.h>
17#include <linux/ptrace.h>
18#include <linux/mman.h>
19#include <linux/mm.h>
20#include <linux/swap.h>
21#include <linux/initrd.h>
22#include <linux/init.h>
23#include <linux/highmem.h>
24#include <linux/bootmem.h>
25#include <linux/pagemap.h>
26#include <linux/poison.h>
27#include <linux/gfp.h>
28
29#include <asm/sections.h>
30#include <asm/page.h>
31#include <asm/pgtable.h>
32#include <asm/vaddrs.h>
33#include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
34#include <asm/tlb.h>
35#include <asm/prom.h>
36#include <asm/leon.h>
37
38unsigned long *sparc_valid_addr_bitmap;
39EXPORT_SYMBOL(sparc_valid_addr_bitmap);
40
41unsigned long phys_base;
42EXPORT_SYMBOL(phys_base);
43
44unsigned long pfn_base;
45EXPORT_SYMBOL(pfn_base);
46
47struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
48unsigned long sparc_unmapped_base;
49
50struct pgtable_cache_struct pgt_quicklists;
51
52/* Initial ramdisk setup */
53extern unsigned int sparc_ramdisk_image;
54extern unsigned int sparc_ramdisk_size;
55
56unsigned long highstart_pfn, highend_pfn;
57
58pte_t *kmap_pte;
59pgprot_t kmap_prot;
60
61#define kmap_get_fixmap_pte(vaddr) \
62 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
63
64void __init kmap_init(void)
65{
66 /* cache the first kmap pte */
67 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
68 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
69}
70
71void show_mem(unsigned int filter)
72{
73 printk("Mem-info:\n");
74 show_free_areas(filter);
75 printk("Free swap: %6ldkB\n",
76 nr_swap_pages << (PAGE_SHIFT-10));
77 printk("%ld pages of RAM\n", totalram_pages);
78 printk("%ld free pages\n", nr_free_pages());
79#if 0 /* undefined pgtable_cache_size, pgd_cache_size */
80 printk("%ld pages in page table cache\n",pgtable_cache_size);
81#ifndef CONFIG_SMP
82 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
83 printk("%ld entries in page dir cache\n",pgd_cache_size);
84#endif
85#endif
86}
87
88void __init sparc_context_init(int numctx)
89{
90 int ctx;
91
92 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
93
94 for(ctx = 0; ctx < numctx; ctx++) {
95 struct ctx_list *clist;
96
97 clist = (ctx_list_pool + ctx);
98 clist->ctx_number = ctx;
99 clist->ctx_mm = NULL;
100 }
101 ctx_free.next = ctx_free.prev = &ctx_free;
102 ctx_used.next = ctx_used.prev = &ctx_used;
103 for(ctx = 0; ctx < numctx; ctx++)
104 add_to_free_ctxlist(ctx_list_pool + ctx);
105}
106
107extern unsigned long cmdline_memory_size;
108unsigned long last_valid_pfn;
109
110unsigned long calc_highpages(void)
111{
112 int i;
113 int nr = 0;
114
115 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
116 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
117 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
118
119 if (end_pfn <= max_low_pfn)
120 continue;
121
122 if (start_pfn < max_low_pfn)
123 start_pfn = max_low_pfn;
124
125 nr += end_pfn - start_pfn;
126 }
127
128 return nr;
129}
130
131static unsigned long calc_max_low_pfn(void)
132{
133 int i;
134 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
135 unsigned long curr_pfn, last_pfn;
136
137 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
138 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
139 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
140
141 if (curr_pfn >= tmp) {
142 if (last_pfn < tmp)
143 tmp = last_pfn;
144 break;
145 }
146
147 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
148 }
149
150 return tmp;
151}
152
153unsigned long __init bootmem_init(unsigned long *pages_avail)
154{
155 unsigned long bootmap_size, start_pfn;
156 unsigned long end_of_phys_memory = 0UL;
157 unsigned long bootmap_pfn, bytes_avail, size;
158 int i;
159
160 bytes_avail = 0UL;
161 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
162 end_of_phys_memory = sp_banks[i].base_addr +
163 sp_banks[i].num_bytes;
164 bytes_avail += sp_banks[i].num_bytes;
165 if (cmdline_memory_size) {
166 if (bytes_avail > cmdline_memory_size) {
167 unsigned long slack = bytes_avail - cmdline_memory_size;
168
169 bytes_avail -= slack;
170 end_of_phys_memory -= slack;
171
172 sp_banks[i].num_bytes -= slack;
173 if (sp_banks[i].num_bytes == 0) {
174 sp_banks[i].base_addr = 0xdeadbeef;
175 } else {
176 sp_banks[i+1].num_bytes = 0;
177 sp_banks[i+1].base_addr = 0xdeadbeef;
178 }
179 break;
180 }
181 }
182 }
183
184 /* Start with page aligned address of last symbol in kernel
185 * image.
186 */
187 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
188
189 /* Now shift down to get the real physical page frame number. */
190 start_pfn >>= PAGE_SHIFT;
191
192 bootmap_pfn = start_pfn;
193
194 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
195
196 max_low_pfn = max_pfn;
197 highstart_pfn = highend_pfn = max_pfn;
198
199 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
200 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
201 max_low_pfn = calc_max_low_pfn();
202 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
203 calc_highpages() >> (20 - PAGE_SHIFT));
204 }
205
206#ifdef CONFIG_BLK_DEV_INITRD
207 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
208 if (sparc_ramdisk_image) {
209 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
210 sparc_ramdisk_image -= KERNBASE;
211 initrd_start = sparc_ramdisk_image + phys_base;
212 initrd_end = initrd_start + sparc_ramdisk_size;
213 if (initrd_end > end_of_phys_memory) {
214 printk(KERN_CRIT "initrd extends beyond end of memory "
215 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
216 initrd_end, end_of_phys_memory);
217 initrd_start = 0;
218 }
219 if (initrd_start) {
220 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
221 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
222 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
223 }
224 }
225#endif
226 /* Initialize the boot-time allocator. */
227 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
228 max_low_pfn);
229
230 /* Now register the available physical memory with the
231 * allocator.
232 */
233 *pages_avail = 0;
234 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
235 unsigned long curr_pfn, last_pfn;
236
237 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
238 if (curr_pfn >= max_low_pfn)
239 break;
240
241 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
242 if (last_pfn > max_low_pfn)
243 last_pfn = max_low_pfn;
244
245 /*
246 * .. finally, did all the rounding and playing
247 * around just make the area go away?
248 */
249 if (last_pfn <= curr_pfn)
250 continue;
251
252 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
253 *pages_avail += last_pfn - curr_pfn;
254
255 free_bootmem(sp_banks[i].base_addr, size);
256 }
257
258#ifdef CONFIG_BLK_DEV_INITRD
259 if (initrd_start) {
260 /* Reserve the initrd image area. */
261 size = initrd_end - initrd_start;
262 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
263 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
264
265 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
266 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
267 }
268#endif
269 /* Reserve the kernel text/data/bss. */
270 size = (start_pfn << PAGE_SHIFT) - phys_base;
271 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
272 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
273
274 /* Reserve the bootmem map. We do not account for it
275 * in pages_avail because we will release that memory
276 * in free_all_bootmem.
277 */
278 size = bootmap_size;
279 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
280 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
281
282 return max_pfn;
283}
284
285/*
286 * paging_init() sets up the page tables: We call the MMU specific
287 * init routine based upon the Sun model type on the Sparc.
288 *
289 */
290extern void srmmu_paging_init(void);
291extern void device_scan(void);
292
293void __init paging_init(void)
294{
295 switch(sparc_cpu_model) {
296 case sparc_leon:
297 leon_init();
298 /* fall through */
299 case sun4m:
300 case sun4d:
301 srmmu_paging_init();
302 sparc_unmapped_base = 0x50000000;
303 break;
304 default:
305 prom_printf("paging_init: Cannot init paging on this Sparc\n");
306 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
307 prom_printf("paging_init: Halting...\n");
308 prom_halt();
309 }
310
311 prom_build_devicetree();
312 of_fill_in_cpu_data();
313 device_scan();
314}
315
316static void __init taint_real_pages(void)
317{
318 int i;
319
320 for (i = 0; sp_banks[i].num_bytes; i++) {
321 unsigned long start, end;
322
323 start = sp_banks[i].base_addr;
324 end = start + sp_banks[i].num_bytes;
325
326 while (start < end) {
327 set_bit(start >> 20, sparc_valid_addr_bitmap);
328 start += PAGE_SIZE;
329 }
330 }
331}
332
333static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
334{
335 unsigned long tmp;
336
337#ifdef CONFIG_DEBUG_HIGHMEM
338 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
339#endif
340
341 for (tmp = start_pfn; tmp < end_pfn; tmp++) {
342 struct page *page = pfn_to_page(tmp);
343
344 ClearPageReserved(page);
345 init_page_count(page);
346 __free_page(page);
347 totalhigh_pages++;
348 }
349}
350
351void __init mem_init(void)
352{
353 int codepages = 0;
354 int datapages = 0;
355 int initpages = 0;
356 int reservedpages = 0;
357 int i;
358
359 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
360 prom_printf("BUG: fixmap and pkmap areas overlap\n");
361 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
362 PKMAP_BASE,
363 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
364 FIXADDR_START);
365 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
366 prom_halt();
367 }
368
369
370 /* Saves us work later. */
371 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
372
373 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
374 i += 1;
375 sparc_valid_addr_bitmap = (unsigned long *)
376 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
377
378 if (sparc_valid_addr_bitmap == NULL) {
379 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
380 prom_halt();
381 }
382 memset(sparc_valid_addr_bitmap, 0, i << 2);
383
384 taint_real_pages();
385
386 max_mapnr = last_valid_pfn - pfn_base;
387 high_memory = __va(max_low_pfn << PAGE_SHIFT);
388
389 totalram_pages = free_all_bootmem();
390
391 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
392 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
393 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
394
395 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
396
397 if (end_pfn <= highstart_pfn)
398 continue;
399
400 if (start_pfn < highstart_pfn)
401 start_pfn = highstart_pfn;
402
403 map_high_region(start_pfn, end_pfn);
404 }
405
406 totalram_pages += totalhigh_pages;
407
408 codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
409 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
410 datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
411 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
412 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
413 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
414
415 /* Ignore memory holes for the purpose of counting reserved pages */
416 for (i=0; i < max_low_pfn; i++)
417 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
418 && PageReserved(pfn_to_page(i)))
419 reservedpages++;
420
421 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
422 nr_free_pages() << (PAGE_SHIFT-10),
423 num_physpages << (PAGE_SHIFT - 10),
424 codepages << (PAGE_SHIFT-10),
425 reservedpages << (PAGE_SHIFT - 10),
426 datapages << (PAGE_SHIFT-10),
427 initpages << (PAGE_SHIFT-10),
428 totalhigh_pages << (PAGE_SHIFT-10));
429}
430
431void free_initmem (void)
432{
433 unsigned long addr;
434 unsigned long freed;
435
436 addr = (unsigned long)(&__init_begin);
437 freed = (unsigned long)(&__init_end) - addr;
438 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
439 struct page *p;
440
441 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
442 p = virt_to_page(addr);
443
444 ClearPageReserved(p);
445 init_page_count(p);
446 __free_page(p);
447 totalram_pages++;
448 num_physpages++;
449 }
450 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
451 freed >> 10);
452}
453
454#ifdef CONFIG_BLK_DEV_INITRD
455void free_initrd_mem(unsigned long start, unsigned long end)
456{
457 if (start < end)
458 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
459 (end - start) >> 10);
460 for (; start < end; start += PAGE_SIZE) {
461 struct page *p;
462
463 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
464 p = virt_to_page(start);
465
466 ClearPageReserved(p);
467 init_page_count(p);
468 __free_page(p);
469 totalram_pages++;
470 num_physpages++;
471 }
472}
473#endif
474
475void sparc_flush_page_to_ram(struct page *page)
476{
477 unsigned long vaddr = (unsigned long)page_address(page);
478
479 if (vaddr)
480 __flush_page_to_ram(vaddr);
481}
482EXPORT_SYMBOL(sparc_flush_page_to_ram);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/sparc/mm/init.c
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
7 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
9 */
10
11#include <linux/module.h>
12#include <linux/signal.h>
13#include <linux/sched.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/ptrace.h>
19#include <linux/mman.h>
20#include <linux/mm.h>
21#include <linux/swap.h>
22#include <linux/initrd.h>
23#include <linux/init.h>
24#include <linux/highmem.h>
25#include <linux/memblock.h>
26#include <linux/pagemap.h>
27#include <linux/poison.h>
28#include <linux/gfp.h>
29
30#include <asm/sections.h>
31#include <asm/page.h>
32#include <asm/pgtable.h>
33#include <asm/vaddrs.h>
34#include <asm/setup.h>
35#include <asm/tlb.h>
36#include <asm/prom.h>
37#include <asm/leon.h>
38
39#include "mm_32.h"
40
41unsigned long *sparc_valid_addr_bitmap;
42EXPORT_SYMBOL(sparc_valid_addr_bitmap);
43
44unsigned long phys_base;
45EXPORT_SYMBOL(phys_base);
46
47unsigned long pfn_base;
48EXPORT_SYMBOL(pfn_base);
49
50struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
51
52/* Initial ramdisk setup */
53extern unsigned int sparc_ramdisk_image;
54extern unsigned int sparc_ramdisk_size;
55
56unsigned long highstart_pfn, highend_pfn;
57
58unsigned long last_valid_pfn;
59
60unsigned long calc_highpages(void)
61{
62 int i;
63 int nr = 0;
64
65 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
66 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
67 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
68
69 if (end_pfn <= max_low_pfn)
70 continue;
71
72 if (start_pfn < max_low_pfn)
73 start_pfn = max_low_pfn;
74
75 nr += end_pfn - start_pfn;
76 }
77
78 return nr;
79}
80
81static unsigned long calc_max_low_pfn(void)
82{
83 int i;
84 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
85 unsigned long curr_pfn, last_pfn;
86
87 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
88 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
89 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
90
91 if (curr_pfn >= tmp) {
92 if (last_pfn < tmp)
93 tmp = last_pfn;
94 break;
95 }
96
97 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
98 }
99
100 return tmp;
101}
102
103static void __init find_ramdisk(unsigned long end_of_phys_memory)
104{
105#ifdef CONFIG_BLK_DEV_INITRD
106 unsigned long size;
107
108 /* Now have to check initial ramdisk, so that it won't pass
109 * the end of memory
110 */
111 if (sparc_ramdisk_image) {
112 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
113 sparc_ramdisk_image -= KERNBASE;
114 initrd_start = sparc_ramdisk_image + phys_base;
115 initrd_end = initrd_start + sparc_ramdisk_size;
116 if (initrd_end > end_of_phys_memory) {
117 printk(KERN_CRIT "initrd extends beyond end of memory "
118 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
119 initrd_end, end_of_phys_memory);
120 initrd_start = 0;
121 } else {
122 /* Reserve the initrd image area. */
123 size = initrd_end - initrd_start;
124 memblock_reserve(initrd_start, size);
125
126 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
127 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
128 }
129 }
130#endif
131}
132
133unsigned long __init bootmem_init(unsigned long *pages_avail)
134{
135 unsigned long start_pfn, bytes_avail, size;
136 unsigned long end_of_phys_memory = 0;
137 unsigned long high_pages = 0;
138 int i;
139
140 memblock_set_bottom_up(true);
141 memblock_allow_resize();
142
143 bytes_avail = 0UL;
144 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
145 end_of_phys_memory = sp_banks[i].base_addr +
146 sp_banks[i].num_bytes;
147 bytes_avail += sp_banks[i].num_bytes;
148 if (cmdline_memory_size) {
149 if (bytes_avail > cmdline_memory_size) {
150 unsigned long slack = bytes_avail - cmdline_memory_size;
151
152 bytes_avail -= slack;
153 end_of_phys_memory -= slack;
154
155 sp_banks[i].num_bytes -= slack;
156 if (sp_banks[i].num_bytes == 0) {
157 sp_banks[i].base_addr = 0xdeadbeef;
158 } else {
159 memblock_add(sp_banks[i].base_addr,
160 sp_banks[i].num_bytes);
161 sp_banks[i+1].num_bytes = 0;
162 sp_banks[i+1].base_addr = 0xdeadbeef;
163 }
164 break;
165 }
166 }
167 memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes);
168 }
169
170 /* Start with page aligned address of last symbol in kernel
171 * image.
172 */
173 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
174
175 /* Now shift down to get the real physical page frame number. */
176 start_pfn >>= PAGE_SHIFT;
177
178 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
179
180 max_low_pfn = max_pfn;
181 highstart_pfn = highend_pfn = max_pfn;
182
183 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
184 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
185 max_low_pfn = calc_max_low_pfn();
186 high_pages = calc_highpages();
187 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
188 high_pages >> (20 - PAGE_SHIFT));
189 }
190
191 find_ramdisk(end_of_phys_memory);
192
193 /* Reserve the kernel text/data/bss. */
194 size = (start_pfn << PAGE_SHIFT) - phys_base;
195 memblock_reserve(phys_base, size);
196
197 size = memblock_phys_mem_size() - memblock_reserved_size();
198 *pages_avail = (size >> PAGE_SHIFT) - high_pages;
199
200 return max_pfn;
201}
202
203/*
204 * paging_init() sets up the page tables: We call the MMU specific
205 * init routine based upon the Sun model type on the Sparc.
206 *
207 */
208void __init paging_init(void)
209{
210 srmmu_paging_init();
211 prom_build_devicetree();
212 of_fill_in_cpu_data();
213 device_scan();
214}
215
216static void __init taint_real_pages(void)
217{
218 int i;
219
220 for (i = 0; sp_banks[i].num_bytes; i++) {
221 unsigned long start, end;
222
223 start = sp_banks[i].base_addr;
224 end = start + sp_banks[i].num_bytes;
225
226 while (start < end) {
227 set_bit(start >> 20, sparc_valid_addr_bitmap);
228 start += PAGE_SIZE;
229 }
230 }
231}
232
233static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
234{
235 unsigned long tmp;
236
237#ifdef CONFIG_DEBUG_HIGHMEM
238 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
239#endif
240
241 for (tmp = start_pfn; tmp < end_pfn; tmp++)
242 free_highmem_page(pfn_to_page(tmp));
243}
244
245void __init mem_init(void)
246{
247 int i;
248
249 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
250 prom_printf("BUG: fixmap and pkmap areas overlap\n");
251 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
252 PKMAP_BASE,
253 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
254 FIXADDR_START);
255 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
256 prom_halt();
257 }
258
259
260 /* Saves us work later. */
261 memset((void *)empty_zero_page, 0, PAGE_SIZE);
262
263 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
264 i += 1;
265 sparc_valid_addr_bitmap = (unsigned long *)
266 memblock_alloc(i << 2, SMP_CACHE_BYTES);
267
268 if (sparc_valid_addr_bitmap == NULL) {
269 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
270 prom_halt();
271 }
272 memset(sparc_valid_addr_bitmap, 0, i << 2);
273
274 taint_real_pages();
275
276 max_mapnr = last_valid_pfn - pfn_base;
277 high_memory = __va(max_low_pfn << PAGE_SHIFT);
278 memblock_free_all();
279
280 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
281 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
282 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
283
284 if (end_pfn <= highstart_pfn)
285 continue;
286
287 if (start_pfn < highstart_pfn)
288 start_pfn = highstart_pfn;
289
290 map_high_region(start_pfn, end_pfn);
291 }
292
293 mem_init_print_info(NULL);
294}
295
296void sparc_flush_page_to_ram(struct page *page)
297{
298 unsigned long vaddr = (unsigned long)page_address(page);
299
300 if (vaddr)
301 __flush_page_to_ram(vaddr);
302}
303EXPORT_SYMBOL(sparc_flush_page_to_ram);