This source file includes following definitions.
- calc_highpages
- calc_max_low_pfn
- find_ramdisk
- bootmem_init
- paging_init
- taint_real_pages
- map_high_region
- mem_init
- sparc_flush_page_to_ram
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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/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
41 unsigned long *sparc_valid_addr_bitmap;
42 EXPORT_SYMBOL(sparc_valid_addr_bitmap);
43
44 unsigned long phys_base;
45 EXPORT_SYMBOL(phys_base);
46
47 unsigned long pfn_base;
48 EXPORT_SYMBOL(pfn_base);
49
50 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
51
52
53 extern unsigned int sparc_ramdisk_image;
54 extern unsigned int sparc_ramdisk_size;
55
56 unsigned long highstart_pfn, highend_pfn;
57
58 unsigned long last_valid_pfn;
59
60 unsigned 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
81 static 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
103 static void __init find_ramdisk(unsigned long end_of_phys_memory)
104 {
105 #ifdef CONFIG_BLK_DEV_INITRD
106 unsigned long size;
107
108
109
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
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
133 unsigned 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
171
172
173 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
174
175
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
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
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205
206
207
208 void __init paging_init(void)
209 {
210 srmmu_paging_init();
211 prom_build_devicetree();
212 of_fill_in_cpu_data();
213 device_scan();
214 }
215
216 static 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
233 static 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
245 void __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
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
296 void 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 }
303 EXPORT_SYMBOL(sparc_flush_page_to_ram);