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Linux 3.11-rc3
[cris-mirror.git] / arch / sparc / mm / init_32.c
blobdb69870828058db51e07699472cc9d9bcd3f7e34
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
38 unsigned long *sparc_valid_addr_bitmap;
39 EXPORT_SYMBOL(sparc_valid_addr_bitmap);
40
41 unsigned long phys_base;
42 EXPORT_SYMBOL(phys_base);
43
44 unsigned long pfn_base;
45 EXPORT_SYMBOL(pfn_base);
46
47 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
48
49 /* Initial ramdisk setup */
50 extern unsigned int sparc_ramdisk_image;
51 extern unsigned int sparc_ramdisk_size;
52
53 unsigned long highstart_pfn, highend_pfn;
54
55 void show_mem(unsigned int filter)
56 {
57 printk("Mem-info:\n");
58 show_free_areas(filter);
59 printk("Free swap: %6ldkB\n",
60 get_nr_swap_pages() << (PAGE_SHIFT-10));
61 printk("%ld pages of RAM\n", totalram_pages);
62 printk("%ld free pages\n", nr_free_pages());
63 }
64
65
66 extern unsigned long cmdline_memory_size;
67 unsigned long last_valid_pfn;
68
69 unsigned long calc_highpages(void)
70 {
71 int i;
72 int nr = 0;
73
74 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
75 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
76 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
77
78 if (end_pfn <= max_low_pfn)
79 continue;
80
81 if (start_pfn < max_low_pfn)
82 start_pfn = max_low_pfn;
83
84 nr += end_pfn - start_pfn;
85 }
86
87 return nr;
88 }
89
90 static unsigned long calc_max_low_pfn(void)
91 {
92 int i;
93 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
94 unsigned long curr_pfn, last_pfn;
95
96 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
97 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
98 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
99
100 if (curr_pfn >= tmp) {
101 if (last_pfn < tmp)
102 tmp = last_pfn;
103 break;
104 }
105
106 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
107 }
108
109 return tmp;
110 }
111
112 unsigned long __init bootmem_init(unsigned long *pages_avail)
113 {
114 unsigned long bootmap_size, start_pfn;
115 unsigned long end_of_phys_memory = 0UL;
116 unsigned long bootmap_pfn, bytes_avail, size;
117 int i;
118
119 bytes_avail = 0UL;
120 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
121 end_of_phys_memory = sp_banks[i].base_addr +
122 sp_banks[i].num_bytes;
123 bytes_avail += sp_banks[i].num_bytes;
124 if (cmdline_memory_size) {
125 if (bytes_avail > cmdline_memory_size) {
126 unsigned long slack = bytes_avail - cmdline_memory_size;
127
128 bytes_avail -= slack;
129 end_of_phys_memory -= slack;
130
131 sp_banks[i].num_bytes -= slack;
132 if (sp_banks[i].num_bytes == 0) {
133 sp_banks[i].base_addr = 0xdeadbeef;
134 } else {
135 sp_banks[i+1].num_bytes = 0;
136 sp_banks[i+1].base_addr = 0xdeadbeef;
137 }
138 break;
139 }
140 }
141 }
142
143 /* Start with page aligned address of last symbol in kernel
144 * image.
145 */
146 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
147
148 /* Now shift down to get the real physical page frame number. */
149 start_pfn >>= PAGE_SHIFT;
150
151 bootmap_pfn = start_pfn;
152
153 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
154
155 max_low_pfn = max_pfn;
156 highstart_pfn = highend_pfn = max_pfn;
157
158 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
159 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
160 max_low_pfn = calc_max_low_pfn();
161 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
162 calc_highpages() >> (20 - PAGE_SHIFT));
163 }
164
165 #ifdef CONFIG_BLK_DEV_INITRD
166 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
167 if (sparc_ramdisk_image) {
168 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
169 sparc_ramdisk_image -= KERNBASE;
170 initrd_start = sparc_ramdisk_image + phys_base;
171 initrd_end = initrd_start + sparc_ramdisk_size;
172 if (initrd_end > end_of_phys_memory) {
173 printk(KERN_CRIT "initrd extends beyond end of memory "
174 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
175 initrd_end, end_of_phys_memory);
176 initrd_start = 0;
177 }
178 if (initrd_start) {
179 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
180 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
181 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
182 }
183 }
184 #endif
185 /* Initialize the boot-time allocator. */
186 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
187 max_low_pfn);
188
189 /* Now register the available physical memory with the
190 * allocator.
191 */
192 *pages_avail = 0;
193 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
194 unsigned long curr_pfn, last_pfn;
195
196 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
197 if (curr_pfn >= max_low_pfn)
198 break;
199
200 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
201 if (last_pfn > max_low_pfn)
202 last_pfn = max_low_pfn;
203
204 /*
205 * .. finally, did all the rounding and playing
206 * around just make the area go away?
207 */
208 if (last_pfn <= curr_pfn)
209 continue;
210
211 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
212 *pages_avail += last_pfn - curr_pfn;
213
214 free_bootmem(sp_banks[i].base_addr, size);
215 }
216
217 #ifdef CONFIG_BLK_DEV_INITRD
218 if (initrd_start) {
219 /* Reserve the initrd image area. */
220 size = initrd_end - initrd_start;
221 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
222 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
223
224 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
225 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
226 }
227 #endif
228 /* Reserve the kernel text/data/bss. */
229 size = (start_pfn << PAGE_SHIFT) - phys_base;
230 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
231 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
232
233 /* Reserve the bootmem map. We do not account for it
234 * in pages_avail because we will release that memory
235 * in free_all_bootmem.
236 */
237 size = bootmap_size;
238 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
239 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
240
241 return max_pfn;
242 }
243
244 /*
245 * paging_init() sets up the page tables: We call the MMU specific
246 * init routine based upon the Sun model type on the Sparc.
247 *
248 */
249 extern void srmmu_paging_init(void);
250 extern void device_scan(void);
251
252 void __init paging_init(void)
253 {
254 srmmu_paging_init();
255 prom_build_devicetree();
256 of_fill_in_cpu_data();
257 device_scan();
258 }
259
260 static void __init taint_real_pages(void)
261 {
262 int i;
263
264 for (i = 0; sp_banks[i].num_bytes; i++) {
265 unsigned long start, end;
266
267 start = sp_banks[i].base_addr;
268 end = start + sp_banks[i].num_bytes;
269
270 while (start < end) {
271 set_bit(start >> 20, sparc_valid_addr_bitmap);
272 start += PAGE_SIZE;
273 }
274 }
275 }
276
277 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
278 {
279 unsigned long tmp;
280
281 #ifdef CONFIG_DEBUG_HIGHMEM
282 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
283 #endif
284
285 for (tmp = start_pfn; tmp < end_pfn; tmp++)
286 free_highmem_page(pfn_to_page(tmp));
287 }
288
289 void __init mem_init(void)
290 {
291 int i;
292
293 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
294 prom_printf("BUG: fixmap and pkmap areas overlap\n");
295 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
296 PKMAP_BASE,
297 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
298 FIXADDR_START);
299 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
300 prom_halt();
301 }
302
303
304 /* Saves us work later. */
305 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
306
307 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
308 i += 1;
309 sparc_valid_addr_bitmap = (unsigned long *)
310 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
311
312 if (sparc_valid_addr_bitmap == NULL) {
313 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
314 prom_halt();
315 }
316 memset(sparc_valid_addr_bitmap, 0, i << 2);
317
318 taint_real_pages();
319
320 max_mapnr = last_valid_pfn - pfn_base;
321 high_memory = __va(max_low_pfn << PAGE_SHIFT);
322 free_all_bootmem();
323
324 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
325 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
326 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
327
328 if (end_pfn <= highstart_pfn)
329 continue;
330
331 if (start_pfn < highstart_pfn)
332 start_pfn = highstart_pfn;
333
334 map_high_region(start_pfn, end_pfn);
335 }
336
337 mem_init_print_info(NULL);
338 }
339
340 void free_initmem (void)
341 {
342 free_initmem_default(POISON_FREE_INITMEM);
343 }
344
345 #ifdef CONFIG_BLK_DEV_INITRD
346 void free_initrd_mem(unsigned long start, unsigned long end)
347 {
348 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
349 "initrd");
350 }
351 #endif
352
353 void sparc_flush_page_to_ram(struct page *page)
354 {
355 unsigned long vaddr = (unsigned long)page_address(page);
356
357 if (vaddr)
358 __flush_page_to_ram(vaddr);
359 }
360 EXPORT_SYMBOL(sparc_flush_page_to_ram);
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