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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/bootmem.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/pgalloc.h>
35#include <asm/setup.h>
36#include <asm/tlb.h>
37#include <asm/prom.h>
38#include <asm/leon.h>
39
40#include "mm_32.h"
41
42unsigned long *sparc_valid_addr_bitmap;
43EXPORT_SYMBOL(sparc_valid_addr_bitmap);
44
45unsigned long phys_base;
46EXPORT_SYMBOL(phys_base);
47
48unsigned long pfn_base;
49EXPORT_SYMBOL(pfn_base);
50
51struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
52
53
54extern unsigned int sparc_ramdisk_image;
55extern unsigned int sparc_ramdisk_size;
56
57unsigned long highstart_pfn, highend_pfn;
58
59unsigned long last_valid_pfn;
60
61unsigned long calc_highpages(void)
62{
63 int i;
64 int nr = 0;
65
66 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
67 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
68 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
69
70 if (end_pfn <= max_low_pfn)
71 continue;
72
73 if (start_pfn < max_low_pfn)
74 start_pfn = max_low_pfn;
75
76 nr += end_pfn - start_pfn;
77 }
78
79 return nr;
80}
81
82static unsigned long calc_max_low_pfn(void)
83{
84 int i;
85 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
86 unsigned long curr_pfn, last_pfn;
87
88 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
89 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
90 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
91
92 if (curr_pfn >= tmp) {
93 if (last_pfn < tmp)
94 tmp = last_pfn;
95 break;
96 }
97
98 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
99 }
100
101 return tmp;
102}
103
104unsigned long __init bootmem_init(unsigned long *pages_avail)
105{
106 unsigned long bootmap_size, start_pfn;
107 unsigned long end_of_phys_memory = 0UL;
108 unsigned long bootmap_pfn, bytes_avail, size;
109 int i;
110
111 bytes_avail = 0UL;
112 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
113 end_of_phys_memory = sp_banks[i].base_addr +
114 sp_banks[i].num_bytes;
115 bytes_avail += sp_banks[i].num_bytes;
116 if (cmdline_memory_size) {
117 if (bytes_avail > cmdline_memory_size) {
118 unsigned long slack = bytes_avail - cmdline_memory_size;
119
120 bytes_avail -= slack;
121 end_of_phys_memory -= slack;
122
123 sp_banks[i].num_bytes -= slack;
124 if (sp_banks[i].num_bytes == 0) {
125 sp_banks[i].base_addr = 0xdeadbeef;
126 } else {
127 sp_banks[i+1].num_bytes = 0;
128 sp_banks[i+1].base_addr = 0xdeadbeef;
129 }
130 break;
131 }
132 }
133 }
134
135
136
137
138 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
139
140
141 start_pfn >>= PAGE_SHIFT;
142
143 bootmap_pfn = start_pfn;
144
145 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
146
147 max_low_pfn = max_pfn;
148 highstart_pfn = highend_pfn = max_pfn;
149
150 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
151 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
152 max_low_pfn = calc_max_low_pfn();
153 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
154 calc_highpages() >> (20 - PAGE_SHIFT));
155 }
156
157#ifdef CONFIG_BLK_DEV_INITRD
158
159 if (sparc_ramdisk_image) {
160 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
161 sparc_ramdisk_image -= KERNBASE;
162 initrd_start = sparc_ramdisk_image + phys_base;
163 initrd_end = initrd_start + sparc_ramdisk_size;
164 if (initrd_end > end_of_phys_memory) {
165 printk(KERN_CRIT "initrd extends beyond end of memory "
166 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
167 initrd_end, end_of_phys_memory);
168 initrd_start = 0;
169 }
170 if (initrd_start) {
171 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
172 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
173 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
174 }
175 }
176#endif
177
178 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
179 max_low_pfn);
180
181
182
183
184 *pages_avail = 0;
185 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
186 unsigned long curr_pfn, last_pfn;
187
188 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
189 if (curr_pfn >= max_low_pfn)
190 break;
191
192 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
193 if (last_pfn > max_low_pfn)
194 last_pfn = max_low_pfn;
195
196
197
198
199
200 if (last_pfn <= curr_pfn)
201 continue;
202
203 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
204 *pages_avail += last_pfn - curr_pfn;
205
206 free_bootmem(sp_banks[i].base_addr, size);
207 }
208
209#ifdef CONFIG_BLK_DEV_INITRD
210 if (initrd_start) {
211
212 size = initrd_end - initrd_start;
213 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
214 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
215
216 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
217 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
218 }
219#endif
220
221 size = (start_pfn << PAGE_SHIFT) - phys_base;
222 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
223 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
224
225
226
227
228
229 size = bootmap_size;
230 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
231 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
232
233 return max_pfn;
234}
235
236
237
238
239
240
241void __init paging_init(void)
242{
243 srmmu_paging_init();
244 prom_build_devicetree();
245 of_fill_in_cpu_data();
246 device_scan();
247}
248
249static void __init taint_real_pages(void)
250{
251 int i;
252
253 for (i = 0; sp_banks[i].num_bytes; i++) {
254 unsigned long start, end;
255
256 start = sp_banks[i].base_addr;
257 end = start + sp_banks[i].num_bytes;
258
259 while (start < end) {
260 set_bit(start >> 20, sparc_valid_addr_bitmap);
261 start += PAGE_SIZE;
262 }
263 }
264}
265
266static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
267{
268 unsigned long tmp;
269
270#ifdef CONFIG_DEBUG_HIGHMEM
271 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
272#endif
273
274 for (tmp = start_pfn; tmp < end_pfn; tmp++)
275 free_highmem_page(pfn_to_page(tmp));
276}
277
278void __init mem_init(void)
279{
280 int i;
281
282 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
283 prom_printf("BUG: fixmap and pkmap areas overlap\n");
284 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
285 PKMAP_BASE,
286 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
287 FIXADDR_START);
288 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
289 prom_halt();
290 }
291
292
293
294 memset((void *)empty_zero_page, 0, PAGE_SIZE);
295
296 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
297 i += 1;
298 sparc_valid_addr_bitmap = (unsigned long *)
299 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
300
301 if (sparc_valid_addr_bitmap == NULL) {
302 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
303 prom_halt();
304 }
305 memset(sparc_valid_addr_bitmap, 0, i << 2);
306
307 taint_real_pages();
308
309 max_mapnr = last_valid_pfn - pfn_base;
310 high_memory = __va(max_low_pfn << PAGE_SHIFT);
311 free_all_bootmem();
312
313 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
314 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
315 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
316
317 if (end_pfn <= highstart_pfn)
318 continue;
319
320 if (start_pfn < highstart_pfn)
321 start_pfn = highstart_pfn;
322
323 map_high_region(start_pfn, end_pfn);
324 }
325
326 mem_init_print_info(NULL);
327}
328
329void free_initmem (void)
330{
331 free_initmem_default(POISON_FREE_INITMEM);
332}
333
334#ifdef CONFIG_BLK_DEV_INITRD
335void free_initrd_mem(unsigned long start, unsigned long end)
336{
337 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
338 "initrd");
339}
340#endif
341
342void sparc_flush_page_to_ram(struct page *page)
343{
344 unsigned long vaddr = (unsigned long)page_address(page);
345
346 if (vaddr)
347 __flush_page_to_ram(vaddr);
348}
349EXPORT_SYMBOL(sparc_flush_page_to_ram);
350
